diff --git a/dist/flexsearch.bundle.debug.js b/dist/flexsearch.bundle.debug.js
index 1e152f7..17603be 100644
--- a/dist/flexsearch.bundle.debug.js
+++ b/dist/flexsearch.bundle.debug.js
@@ -138,12 +138,12 @@ G.prototype.assign = function(a) {
   this.minlength = y(a.minlength, 1, this.minlength);
   this.maxlength = y(a.maxlength, 0, this.maxlength);
   if (this.cache = c = y(a.cache, !0, this.cache)) {
-    this.L = null, this.T = "number" === typeof c ? c : 2e5, this.H = new Map(), this.J = new Map(), this.A = this.h = 128;
+    this.L = null, this.S = "number" === typeof c ? c : 2e5, this.H = new Map(), this.J = new Map(), this.A = this.h = 128;
   }
   this.B = "";
-  this.P = null;
+  this.O = null;
   this.M = "";
-  this.R = null;
+  this.P = null;
   if (this.matcher) {
     for (const d of this.matcher.keys()) {
       this.B += (this.B ? "|" : "") + d;
@@ -197,8 +197,8 @@ G.prototype.encode = function(a) {
       }
     }
     let k;
-    this.stemmer && 2 < g.length && (this.R || (this.R = new RegExp("(?!^)(" + this.M + ")$")), g = g.replace(this.R, l => this.stemmer.get(l)), k = 1);
-    this.matcher && 1 < g.length && (this.P || (this.P = new RegExp("(" + this.B + ")", "g")), g = g.replace(this.P, l => this.matcher.get(l)), k = 1);
+    this.stemmer && 2 < g.length && (this.P || (this.P = new RegExp("(?!^)(" + this.M + ")$")), g = g.replace(this.P, l => this.stemmer.get(l)), k = 1);
+    this.matcher && 1 < g.length && (this.O || (this.O = new RegExp("(" + this.B + ")", "g")), g = g.replace(this.O, l => this.matcher.get(l)), k = 1);
     g && k && (g.length < this.minlength || this.filter && this.filter.has(g)) && (g = "");
     if (g && (this.mapper || this.dedupe && 1 < g.length)) {
       e = "";
@@ -212,11 +212,11 @@ G.prototype.encode = function(a) {
         g = g.replace(this.replacer[e], this.replacer[e + 1]);
       }
     }
-    this.cache && h.length <= this.A && (this.J.set(h, g), this.J.size > this.T && (this.J.clear(), this.A = this.A / 1.1 | 0));
+    this.cache && h.length <= this.A && (this.J.set(h, g), this.J.size > this.S && (this.J.clear(), this.A = this.A / 1.1 | 0));
     g && c.push(g);
   }
   this.finalize && (c = this.finalize(c) || c);
-  this.cache && a.length <= this.h && (this.H.set(a, c), this.H.size > this.T && (this.H.clear(), this.h = this.h / 1.1 | 0));
+  this.cache && a.length <= this.h && (this.H.set(a, c), this.H.size > this.S && (this.H.clear(), this.h = this.h / 1.1 | 0));
   return c;
 };
 function la(a) {
@@ -542,7 +542,7 @@ O.prototype.add = function(a, b, c, d) {
               }
             default:
               if (Q(this, m, p, f, a, c), n && 1 < d && r < d - 1) {
-                for (e = z(), g = this.S, f = p, h = Math.min(n + 1, d - r), e[f] = 1, k = 1; k < h; k++) {
+                for (e = z(), g = this.R, f = p, h = Math.min(n + 1, d - r), e[f] = 1, k = 1; k < h; k++) {
                   if ((p = b[this.rtl ? d - 1 - r - k : r + k]) && !e[p]) {
                     e[p] = 1;
                     const t = this.score ? this.score(b, f, r, p, k) : P(g + (d / 2 > g ? 0 : 1), d, r, h - 1, k - 1), x = this.bidirectional && p > f;
@@ -558,7 +558,7 @@ O.prototype.add = function(a, b, c, d) {
       b = "";
     }
   }
-  this.db && (b || this.commit_task.push({del:a}), this.U && Ca(this));
+  this.db && (b || this.commit_task.push({del:a}), this.T && Ca(this));
   return this;
 };
 function Q(a, b, c, d, e, f, g) {
@@ -1132,7 +1132,7 @@ O.prototype.search = function(a, b, c) {
     return async function() {
       for (let t, x; q < e; q++) {
         x = a[q];
-        r ? (t = await V(p, x, r), t = Ka(t, d, f, p.S, b, g, 2 === e), f && !1 === t && d.length || (r = x)) : (t = await V(p, x), t = Ka(t, d, f, p.resolution, b, g, 1 === e));
+        r ? (t = await V(p, x, r, 0, 0, !1, !1), t = Ka(t, d, f, p.R), f && !1 === t && d.length || (r = x)) : (t = await V(p, x, "", 0, 0, !1, !1), t = Ka(t, d, f, p.resolution));
         if (t) {
           return t;
         }
@@ -1156,7 +1156,7 @@ O.prototype.search = function(a, b, c) {
   }
   for (let p, t; q < e; q++) {
     t = a[q];
-    r ? (p = V(this, t, r), p = Ka(p, d, f, this.S, b, g, 2 === e), f && !1 === p && d.length || (r = t)) : (p = V(this, t), p = Ka(p, d, f, this.resolution, b, g, 1 === e));
+    r ? (p = V(this, t, r, 0, 0, !1, !1), p = Ka(p, d, f, this.R), f && !1 === p && d.length || (r = t)) : (p = V(this, t, "", 0, 0, !1, !1), p = Ka(p, d, f, this.resolution));
     if (p) {
       return p;
     }
@@ -1184,26 +1184,19 @@ function U(a, b, c, d, e, f, g) {
     return e ? h : h && h.length ? e ? R(h, c, d) : new S(h) : e ? [] : new S([]);
   }) : a && a.length ? e ? R(a, c, d) : new S(a) : e ? [] : new S([]);
 }
-function Ka(a, b, c, d, e, f, g) {
-  let h = [];
+function Ka(a, b, c, d) {
+  let e = [];
   if (a) {
     d = Math.min(a.length, d);
-    for (let k = 0, l = 0, m; k < d; k++) {
-      if (m = a[k]) {
-        if (f && m && g && (m.length <= f ? (f -= m.length, m = null) : (m = m.slice(f), f = 0)), m && (h[k] = m, g && (l += m.length, l >= e))) {
-          break;
-        }
-      }
+    for (let f = 0, g; f < d; f++) {
+      (g = a[f]) && g && (e[f] = g);
     }
-    if (h.length) {
-      if (g) {
-        return R(h, e, 0);
-      }
-      b.push(h);
+    if (e.length) {
+      b.push(e);
       return;
     }
   }
-  return !c && h;
+  return !c && e;
 }
 function V(a, b, c, d, e, f, g, h) {
   let k;
@@ -1233,7 +1226,7 @@ function V(a, b, c, d, e, f, g, h) {
     }
     b || this.reg.delete(a);
   }
-  this.db && (this.commit_task.push({del:a}), this.U && Ca(this));
+  this.db && (this.commit_task.push({del:a}), this.T && Ca(this));
   this.cache && this.cache.remove(a);
   return this;
 };
@@ -1269,7 +1262,7 @@ function La(a, b) {
     a = {};
   }
   c = a.context || {};
-  const d = a.encode || a.encoder || na;
+  const d = B(a.encoder) ? va[a.encoder] : a.encode || a.encoder || na;
   this.encoder = d.encode ? d : "object" === typeof d ? new G(d) : {encode:d};
   let e;
   this.resolution = a.resolution || 9;
@@ -1282,14 +1275,14 @@ function La(a, b) {
   this.map = e ? new L(e) : new Map();
   this.ctx = e ? new L(e) : new Map();
   this.reg = b || (this.fastupdate ? e ? new L(e) : new Map() : e ? new M(e) : new Set());
-  this.S = c.resolution || 1;
+  this.R = c.resolution || 1;
   this.rtl = d.rtl || a.rtl || !1;
   this.cache = (e = a.cache || null) && new H(e);
   this.resolve = !1 !== a.resolve;
   if (e = a.db) {
-    this.db = e.mount(this);
+    this.db = this.mount(e);
   }
-  this.U = !1 !== a.commit;
+  this.T = !1 !== a.commit;
   this.commit_task = [];
   this.commit_timer = null;
 }
@@ -1476,35 +1469,39 @@ async function Na(a) {
   }
 }
 ;let Oa = 0;
-function W(a) {
+function W(a = {}) {
+  function b(f) {
+    function g(h) {
+      h = h.data || h;
+      const k = h.id, l = k && e.h[k];
+      l && (l(h.msg), delete e.h[k]);
+    }
+    this.worker = f || Pa(c, d, a.worker);
+    if (this.worker.then) {
+      return this.worker.then(b);
+    }
+    this.h = z();
+    if (this.worker) {
+      d ? this.worker.on("message", g) : this.worker.onmessage = g;
+      if (a.config) {
+        return new Promise(function(h) {
+          e.h[++Oa] = function() {
+            h(e);
+          };
+          e.worker.postMessage({id:Oa, task:"init", factory:c, options:a});
+        });
+      }
+      this.worker.postMessage({task:"init", factory:c, options:a});
+      return this.worker;
+    }
+  }
   if (!this) {
     return new W(a);
   }
-  a || (a = {});
-  let b = "undefined" !== typeof self && (self || window)._factory;
-  b && (b = b.toString());
-  const c = "undefined" === typeof window, d = this;
-  (async function() {
-    function e(f) {
-      f = f.data || f;
-      const g = f.id, h = g && d.N[g];
-      h && (h(f.msg), delete d.N[g]);
-    }
-    this.worker = await Pa(b, c, a.worker);
-    this.N = z();
-    if (this.worker) {
-      c ? this.worker.on("message", e) : this.worker.onmessage = e;
-      if (a.config) {
-        return delete a.db, new Promise(function(f) {
-          d.N[++Oa] = function() {
-            f(d);
-          };
-          d.worker.postMessage({id:Oa, task:"init", factory:b, options:a});
-        });
-      }
-      this.worker.postMessage({task:"init", factory:b, options:a});
-    }
-  }).call(this);
+  let c = "undefined" !== typeof self ? self._factory : "undefined" !== typeof window ? window._factory : null;
+  c && (c = c.toString());
+  const d = "undefined" === typeof window, e = this;
+  this.worker = b.call(this);
 }
 X("add");
 X("append");
@@ -1512,20 +1509,20 @@ X("search");
 X("update");
 X("remove");
 function X(a) {
-  W.prototype[a] = W.prototype[a + "Async"] = function() {
+  W.prototype[a] = W.prototype[a + "Async"] = async function() {
     const b = this, c = [].slice.call(arguments);
     var d = c[c.length - 1];
     let e;
     "function" === typeof d && (e = d, c.splice(c.length - 1, 1));
     d = new Promise(function(f) {
-      b.N[++Oa] = f;
+      b.h[++Oa] = f;
       b.worker.postMessage({task:a, id:Oa, args:c});
     });
     return e ? (d.then(e), this) : d;
   };
 }
-async function Pa(a, b, c) {
-  return b ? "undefined" !== typeof module ? new (require("worker_threads")["Worker"])(__dirname + "/node/node.js") : new ((await import("worker_threads"))["Worker"])((1,eval)("import.meta.dirname") + "/node/node.mjs") : a ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + Na.toString()], {type:"text/javascript"}))) : new window.Worker(B(c) ? c : "worker/worker.js", {type:"module"});
+function Pa(a, b, c) {
+  return b ? "undefined" !== typeof module ? new (require("worker_threads")["Worker"])(__dirname + "/node/node.js") : import("worker_threads").then(function(worker){ return new worker["Worker"]((1,eval)("import.meta.dirname") + "/node/node.mjs"); }) : a ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + Na.toString()], {type:"text/javascript"}))) : new window.Worker(B(c) ? c : "worker/worker.js", {type:"module"});
 }
 ;Y.prototype.add = function(a, b, c) {
   C(a) && (b = a, a = ca(b, this.key));
@@ -1547,7 +1544,7 @@ async function Pa(a, b, c) {
     }
     if (this.tag) {
       for (d = 0; d < this.F.length; d++) {
-        var f = this.F[d], g = this.O[d];
+        var f = this.F[d], g = this.N[d];
         e = this.tag.get(g);
         let h = z();
         if ("function" === typeof f) {
@@ -1599,7 +1596,7 @@ async function Pa(a, b, c) {
             if (!m) {
               continue;
             }
-            l = [l.V];
+            l = [l.U];
           } else if (B(l) || l.constructor === String) {
             h[l] = b[l];
             continue;
@@ -1884,7 +1881,7 @@ function Ta(a) {
     return new Y(a);
   }
   const b = a.document || a.doc || a;
-  var c, d;
+  let c, d;
   this.G = [];
   this.field = [];
   this.K = [];
@@ -1896,36 +1893,13 @@ function Ta(a) {
   this.cache = (c = a.cache || null) && new H(c);
   a.cache = !1;
   this.worker = a.worker;
-  c = new Map();
-  d = b.index || b.field || b;
-  B(d) && (d = [d]);
-  for (let e = 0, f, g; e < d.length; e++) {
-    f = d[e];
-    B(f) || (g = f, f = f.field);
-    g = C(g) ? Object.assign({}, a, g) : a;
-    if (this.worker) {
-      const h = new W(g);
-      c.set(f, h);
-      h.worker || (this.worker = !1);
-    }
-    this.worker || c.set(f, new O(g, this.reg));
-    g.custom ? this.G[e] = g.custom : (this.G[e] = Va(f, this.K), g.filter && ("string" === typeof this.G[e] && (this.G[e] = new String(this.G[e])), this.G[e].I = g.filter));
-    this.field[e] = f;
-  }
-  if (this.C) {
-    d = b.store;
-    B(d) && (d = [d]);
-    for (let e = 0, f, g; e < d.length; e++) {
-      f = d[e], g = f.field || f, f.custom ? (this.C[e] = f.custom, f.custom.V = g) : (this.C[e] = Va(g, this.K), f.filter && ("string" === typeof this.C[e] && (this.C[e] = new String(this.C[e])), this.C[e].I = f.filter));
-    }
-  }
-  this.index = c;
+  this.index = Wa.call(this, a, b);
   this.tag = null;
   if (c = b.tag) {
     if ("string" === typeof c && (c = [c]), c.length) {
       this.tag = new Map();
       this.F = [];
-      this.O = [];
+      this.N = [];
       for (let e = 0, f, g; e < c.length; e++) {
         f = c[e];
         g = f.field || f;
@@ -1933,19 +1907,32 @@ function Ta(a) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
         f.custom ? this.F[e] = f.custom : (this.F[e] = Va(g, this.K), f.filter && ("string" === typeof this.F[e] && (this.F[e] = new String(this.F[e])), this.F[e].I = f.filter));
-        this.O[e] = g;
+        this.N[e] = g;
         this.tag.set(g, new Map());
       }
     }
   }
-  a.db && this.mount(a.db);
+  if (this.worker) {
+    a = [];
+    for (const e of this.index.values()) {
+      e.worker.then && a.push(e.worker);
+    }
+    if (a.length) {
+      const e = this;
+      return Promise.all(a).then(function() {
+        return e;
+      });
+    }
+  } else {
+    a.db && this.mount(a.db);
+  }
 }
 u = Y.prototype;
 u.mount = function(a) {
   let b = this.field;
   if (this.tag) {
-    for (let e = 0, f; e < this.O.length; e++) {
-      f = this.O[e];
+    for (let e = 0, f; e < this.N.length; e++) {
+      f = this.N[e];
       var c = void 0;
       this.index.set(f, c = new O({}, this.reg));
       b === this.field && (b = b.slice(0));
@@ -1982,6 +1969,31 @@ u.destroy = function() {
   }
   return Promise.all(a);
 };
+function Wa(a, b) {
+  const c = new Map();
+  let d = b.index || b.field || b;
+  B(d) && (d = [d]);
+  for (let e = 0, f, g; e < d.length; e++) {
+    f = d[e];
+    B(f) || (g = f, f = f.field);
+    g = C(g) ? Object.assign({}, a, g) : a;
+    if (this.worker) {
+      const h = new W(g);
+      h.worker ? c.set(f, h) : this.worker = !1;
+    }
+    this.worker || c.set(f, new O(g, this.reg));
+    g.custom ? this.G[e] = g.custom : (this.G[e] = Va(f, this.K), g.filter && ("string" === typeof this.G[e] && (this.G[e] = new String(this.G[e])), this.G[e].I = g.filter));
+    this.field[e] = f;
+  }
+  if (this.C) {
+    a = b.store;
+    B(a) && (a = [a]);
+    for (let e = 0, f, g; e < a.length; e++) {
+      f = a[e], g = f.field || f, f.custom ? (this.C[e] = f.custom, f.custom.U = g) : (this.C[e] = Va(g, this.K), f.filter && ("string" === typeof this.C[e] && (this.C[e] = new String(this.C[e])), this.C[e].I = f.filter));
+    }
+  }
+  return c;
+}
 function Va(a, b) {
   const c = a.split(":");
   let d = 0;
@@ -2106,10 +2118,10 @@ u.import = function(a, b) {
   }
 };
 Ba(Y.prototype);
-const Wa = "undefined" !== typeof window && (window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB), Xa = ["map", "ctx", "tag", "reg", "cfg"];
-function Ya(a, b = {}) {
+const Xa = "undefined" !== typeof window && (window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB), Ya = ["map", "ctx", "tag", "reg", "cfg"];
+function Za(a, b = {}) {
   if (!this) {
-    return new Ya(a, b);
+    return new Za(a, b);
   }
   "object" === typeof a && (b = a = a.name);
   a || console.info("Default storage space was used, because a name was not passed.");
@@ -2119,7 +2131,7 @@ function Ya(a, b = {}) {
   this.db = null;
   this.h = {};
 }
-u = Ya.prototype;
+u = Za.prototype;
 u.mount = function(a) {
   if (!a.encoder) {
     return a.mount(this);
@@ -2131,10 +2143,10 @@ u.open = function() {
   let a = this;
   navigator.storage && navigator.storage.persist();
   return this.db || new Promise(function(b, c) {
-    const d = Wa.open(a.id + (a.field ? ":" + a.field : ""), 1);
+    const d = Xa.open(a.id + (a.field ? ":" + a.field : ""), 1);
     d.onupgradeneeded = function() {
       const e = a.db = this.result;
-      Xa.forEach(f => {
+      Ya.forEach(f => {
         e.objectStoreNames.contains(f) || e.createObjectStore(f);
       });
     };
@@ -2160,16 +2172,17 @@ u.close = function() {
   this.db = null;
 };
 u.destroy = function() {
-  return Wa.deleteDatabase(this.id + (this.field ? ":" + this.field : ""));
+  return Xa.deleteDatabase(this.id + (this.field ? ":" + this.field : ""));
 };
 u.clear = function() {
-  const a = this.db.transaction(Xa, "readwrite");
-  for (let b = 0; b < Xa.length; b++) {
-    a.objectStore(Xa[b]).clear();
+  const a = this.db.transaction(Ya, "readwrite");
+  for (let b = 0; b < Ya.length; b++) {
+    a.objectStore(Ya[b]).clear();
   }
   return Z(a);
 };
 u.get = function(a, b, c = 0, d = 0, e = !0, f = !1) {
+  console.log("!!!!!!!!!!!");
   a = this.db.transaction(b ? "ctx" : "map", "readonly").objectStore(b ? "ctx" : "map").get(b ? b + ":" + a : a);
   const g = this;
   return Z(a).then(function(h) {
@@ -2269,7 +2282,7 @@ u.commit = async function(a, b, c) {
         b = !0;
         break;
       } else {
-        d[e] = f.W;
+        d[e] = f.V;
       }
     }
     b || (c || (d = d.concat(ba(a.reg))), d.length && await this.remove(d));
@@ -2349,7 +2362,7 @@ u.commit = async function(a, b, c) {
     }
   }), a.map.clear(), a.ctx.clear(), a.tag && a.tag.clear(), a.store && a.store.clear(), a.document || a.reg.clear());
 };
-function Za(a, b, c) {
+function $a(a, b, c) {
   const d = a.value;
   let e, f, g = 0;
   for (let h = 0, k; h < d.length; h++) {
@@ -2378,17 +2391,17 @@ u.remove = function(a) {
   return Promise.all([this.transaction("map", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       const c = this.result;
-      c && Za(c, a);
+      c && $a(c, a);
     };
   }), this.transaction("ctx", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       const c = this.result;
-      c && Za(c, a);
+      c && $a(c, a);
     };
   }), this.transaction("tag", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       const c = this.result;
-      c && Za(c, a, !0);
+      c && $a(c, a, !0);
     };
   }), this.transaction("reg", "readwrite", function(b) {
     for (let c = 0; c < a.length; c++) {
@@ -2408,9 +2421,9 @@ function Z(a) {
     a = null;
   });
 }
-;const $a = {Index:O, Charset:va, Encoder:G, Document:Y, Worker:W, Resolver:S, IndexedDB:Ya, Language:{}}, ab = self;
-let bb;
-(bb = ab.define) && bb.amd ? bb([], function() {
-  return $a;
-}) : "object" === typeof ab.exports ? ab.exports = $a : ab.FlexSearch = $a;
+;const ab = {Index:O, Charset:va, Encoder:G, Document:Y, Worker:W, Resolver:S, IndexedDB:Za, Language:{}}, bb = self;
+let db;
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index b518beb..31d5ac5 100644
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-u.open=function(){let a=this;navigator.storage&&navigator.storage.persist();return this.db||new Promise(function(b,c){const d=Wa.open(a.id+(a.field?":"+a.field:""),1);d.onupgradeneeded=function(){const e=a.db=this.result;Xa.forEach(f=>{e.objectStoreNames.contains(f)||e.createObjectStore(f)})};d.onblocked=function(e){console.error("blocked",e);c()};d.onerror=function(e){console.error(this.error,e);c()};d.onsuccess=function(){a.db=this.result;a.db.onversionchange=function(){a.close()};b(a)}})};
-u.close=function(){this.db.close();this.db=null};u.destroy=function(){return Wa.deleteDatabase(this.id+(this.field?":"+this.field:""))};u.clear=function(){const a=this.db.transaction(Xa,"readwrite");for(let b=0;b<Xa.length;b++)a.objectStore(Xa[b]).clear();return Z(a)};
-u.get=function(a,b,c=0,d=0,e=!0,f=!1){a=this.db.transaction(b?"ctx":"map","readonly").objectStore(b?"ctx":"map").get(b?b+":"+a:a);const g=this;return Z(a).then(function(h){let k=[];if(!h||!h.length)return k;if(e){if(!c&&!d&&1===h.length)return h[0];for(let l=0,m;l<h.length;l++)if((m=h[l])&&m.length){if(d>=m.length){d-=m.length;continue}const n=c?d+Math.min(m.length-d,c):m.length;for(let q=d;q<n;q++)k.push(m[q]);d=0;if(k.length===c)break}return f?g.enrich(k):k}return h})};
+u.import=function(a,b){if(b)switch(B(b)&&(b=JSON.parse(b)),a){case "tag":this.A=b;break;case "reg":this.fastupdate=!1;this.reg=b;for(let d=0,e;d<this.field.length;d++)e=this.index[this.field[d]],e.reg=b,e.fastupdate=!1;break;case "store":this.store=b;break;default:a=a.split(".");const c=a[0];a=a[1];c&&a&&this.index[c].import(a,b)}};Ba(Y.prototype);const Xa="undefined"!==typeof window&&(window.indexedDB||window.mozIndexedDB||window.webkitIndexedDB||window.msIndexedDB),Ya=["map","ctx","tag","reg","cfg"];
+function Za(a,b={}){if(!this)return new Za(a,b);"object"===typeof a&&(b=a=a.name);a||console.info("Default storage space was used, because a name was not passed.");this.id="flexsearch"+(a?":"+a.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"");this.field=b.field?b.field.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"";this.support_tag_search=!1;this.db=null;this.h={}}u=Za.prototype;u.mount=function(a){if(!a.encoder)return a.mount(this);a.db=this;return this.open()};
+u.open=function(){let a=this;navigator.storage&&navigator.storage.persist();return this.db||new Promise(function(b,c){const d=Xa.open(a.id+(a.field?":"+a.field:""),1);d.onupgradeneeded=function(){const e=a.db=this.result;Ya.forEach(f=>{e.objectStoreNames.contains(f)||e.createObjectStore(f)})};d.onblocked=function(e){console.error("blocked",e);c()};d.onerror=function(e){console.error(this.error,e);c()};d.onsuccess=function(){a.db=this.result;a.db.onversionchange=function(){a.close()};b(a)}})};
+u.close=function(){this.db.close();this.db=null};u.destroy=function(){return Xa.deleteDatabase(this.id+(this.field?":"+this.field:""))};u.clear=function(){const a=this.db.transaction(Ya,"readwrite");for(let b=0;b<Ya.length;b++)a.objectStore(Ya[b]).clear();return Z(a)};
+u.get=function(a,b,c=0,d=0,e=!0,f=!1){console.log("!!!!!!!!!!!");a=this.db.transaction(b?"ctx":"map","readonly").objectStore(b?"ctx":"map").get(b?b+":"+a:a);const g=this;return Z(a).then(function(h){let k=[];if(!h||!h.length)return k;if(e){if(!c&&!d&&1===h.length)return h[0];for(let l=0,m;l<h.length;l++)if((m=h[l])&&m.length){if(d>=m.length){d-=m.length;continue}const n=c?d+Math.min(m.length-d,c):m.length;for(let q=d;q<n;q++)k.push(m[q]);d=0;if(k.length===c)break}return f?g.enrich(k):k}return h})};
 u.tag=function(a,b=0,c=0,d=!1){a=this.db.transaction("tag","readonly").objectStore("tag").get(a);const e=this;return Z(a).then(function(f){if(!f||!f.length||c>=f.length)return[];if(!b&&!c)return f;f=f.slice(c,c+b);return d?e.enrich(f):f})};
 u.enrich=function(a){"object"!==typeof a&&(a=[a]);const b=this.db.transaction("reg","readonly").objectStore("reg"),c=[];for(let d=0;d<a.length;d++)c[d]=Z(b.get(a[d]));return Promise.all(c).then(function(d){for(let e=0;e<d.length;e++)d[e]={id:a[e],doc:d[e]?JSON.parse(d[e]):null};return d})};u.has=function(a){a=this.db.transaction("reg","readonly").objectStore("reg").getKey(a);return Z(a)};u.search=null;u.info=function(){};
 u.transaction=function(a,b,c){let d=this.h[a+":"+b];if(d)return c.call(this,d);let e=this.db.transaction(a,b);this.h[a+":"+b]=d=e.objectStore(a);return new Promise((f,g)=>{e.onerror=h=>{this.h[a+":"+b]=null;e.abort();e=d=null;g(h)};e.oncomplete=h=>{e=d=this.h[a+":"+b]=null;f(h||!0)};return c.call(this,d)})};
-u.commit=async function(a,b,c){if(b)await this.clear(),a.commit_task=[];else{let d=a.commit_task;a.commit_task=[];for(let e=0,f;e<d.length;e++)if(f=d[e],f.clear){await this.clear();b=!0;break}else d[e]=f.W;b||(c||(d=d.concat(ba(a.reg))),d.length&&await this.remove(d))}a.reg.size&&(await this.transaction("map","readwrite",function(d){for(const e of a.map){const f=e[0],g=e[1];g.length&&(b?d.put(g,f):d.get(f).onsuccess=function(){let h=this.result;var k;if(h&&h.length){const l=Math.max(h.length,g.length);
+u.commit=async function(a,b,c){if(b)await this.clear(),a.commit_task=[];else{let d=a.commit_task;a.commit_task=[];for(let e=0,f;e<d.length;e++)if(f=d[e],f.clear){await this.clear();b=!0;break}else d[e]=f.V;b||(c||(d=d.concat(ba(a.reg))),d.length&&await this.remove(d))}a.reg.size&&(await this.transaction("map","readwrite",function(d){for(const e of a.map){const f=e[0],g=e[1];g.length&&(b?d.put(g,f):d.get(f).onsuccess=function(){let h=this.result;var k;if(h&&h.length){const l=Math.max(h.length,g.length);
 for(let m=0,n,q;m<l;m++)if((q=g[m])&&q.length){if((n=h[m])&&n.length)for(k=0;k<q.length;k++)n.push(q[k]);else h[m]=q;k=1}}else h=g,k=1;k&&d.put(h,f)})}}),await this.transaction("ctx","readwrite",function(d){for(const e of a.ctx){const f=e[0],g=e[1];for(const h of g){const k=h[0],l=h[1];l.length&&(b?d.put(l,f+":"+k):d.get(f+":"+k).onsuccess=function(){let m=this.result;var n;if(m&&m.length){const q=Math.max(m.length,l.length);for(let r=0,p,t;r<q;r++)if((t=l[r])&&t.length){if((p=m[r])&&p.length)for(n=
 0;n<t.length;n++)p.push(t[n]);else m[r]=t;n=1}}else m=l,n=1;n&&d.put(m,f+":"+k)})}}}),a.store?await this.transaction("reg","readwrite",function(d){for(const e of a.store){const f=e[0],g=e[1];d.put("object"===typeof g?JSON.stringify(g):1,f)}}):a.bypass||await this.transaction("reg","readwrite",function(d){for(const e of a.reg.keys())d.put(1,e)}),a.tag&&await this.transaction("tag","readwrite",function(d){for(const e of a.tag){const f=e[0],g=e[1];g.length&&(d.get(f).onsuccess=function(){let h=this.result;
 h=h&&h.length?h.concat(g):g;d.put(h,f)})}}),a.map.clear(),a.ctx.clear(),a.tag&&a.tag.clear(),a.store&&a.store.clear(),a.document||a.reg.clear())};
-function Za(a,b,c){const d=a.value;let e,f,g=0;for(let h=0,k;h<d.length;h++){if(k=c?d:d[h]){for(let l=0,m,n;l<b.length;l++)if(n=b[l],m=k.indexOf(f?parseInt(n,10):n),0>m&&!f&&"string"===typeof n&&!isNaN(n)&&(m=k.indexOf(parseInt(n,10)))&&(f=1),0<=m)if(e=1,1<k.length)k.splice(m,1);else{d[h]=[];break}g+=k.length}if(c)break}g?e&&a.update(d):a.delete();a.continue()}
-u.remove=function(a){"object"!==typeof a&&(a=[a]);return Promise.all([this.transaction("map","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&Za(c,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&Za(c,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&Za(c,a,!0)}}),this.transaction("reg","readwrite",function(b){for(let c=0;c<a.length;c++)b.delete(a[c])})])};
-function Z(a){return new Promise((b,c)=>{a.onsuccess=function(){b(this.result)};a.oncomplete=function(){b(this.result)};a.onerror=c;a=null})};const $a={Index:O,Charset:va,Encoder:F,Document:Y,Worker:W,Resolver:S,IndexedDB:Ya,Language:{}},ab=self;let bb;(bb=ab.define)&&bb.amd?bb([],function(){return $a}):"object"===typeof ab.exports?ab.exports=$a:ab.FlexSearch=$a;}(this));
+function $a(a,b,c){const d=a.value;let e,f,g=0;for(let h=0,k;h<d.length;h++){if(k=c?d:d[h]){for(let l=0,m,n;l<b.length;l++)if(n=b[l],m=k.indexOf(f?parseInt(n,10):n),0>m&&!f&&"string"===typeof n&&!isNaN(n)&&(m=k.indexOf(parseInt(n,10)))&&(f=1),0<=m)if(e=1,1<k.length)k.splice(m,1);else{d[h]=[];break}g+=k.length}if(c)break}g?e&&a.update(d):a.delete();a.continue()}
+u.remove=function(a){"object"!==typeof a&&(a=[a]);return Promise.all([this.transaction("map","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&$a(c,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&$a(c,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&$a(c,a,!0)}}),this.transaction("reg","readwrite",function(b){for(let c=0;c<a.length;c++)b.delete(a[c])})])};
+function Z(a){return new Promise((b,c)=>{a.onsuccess=function(){b(this.result)};a.oncomplete=function(){b(this.result)};a.onerror=c;a=null})};const ab={Index:O,Charset:va,Encoder:F,Document:Y,Worker:W,Resolver:S,IndexedDB:Za,Language:{}},bb=self;let db;(db=bb.define)&&db.amd?db([],function(){return ab}):"object"===typeof bb.exports?bb.exports=ab:bb.FlexSearch=ab;}(this));
diff --git a/dist/flexsearch.bundle.module.debug.js b/dist/flexsearch.bundle.module.debug.js
index e99d03b..233136b 100644
--- a/dist/flexsearch.bundle.module.debug.js
+++ b/dist/flexsearch.bundle.module.debug.js
@@ -137,12 +137,12 @@ G.prototype.assign = function(a) {
   this.minlength = y(a.minlength, 1, this.minlength);
   this.maxlength = y(a.maxlength, 0, this.maxlength);
   if (this.cache = c = y(a.cache, !0, this.cache)) {
-    this.L = null, this.T = "number" === typeof c ? c : 2e5, this.H = new Map(), this.J = new Map(), this.A = this.h = 128;
+    this.L = null, this.S = "number" === typeof c ? c : 2e5, this.H = new Map(), this.J = new Map(), this.A = this.h = 128;
   }
   this.B = "";
-  this.P = null;
+  this.O = null;
   this.M = "";
-  this.R = null;
+  this.P = null;
   if (this.matcher) {
     for (const d of this.matcher.keys()) {
       this.B += (this.B ? "|" : "") + d;
@@ -196,8 +196,8 @@ G.prototype.encode = function(a) {
       }
     }
     let k;
-    this.stemmer && 2 < g.length && (this.R || (this.R = new RegExp("(?!^)(" + this.M + ")$")), g = g.replace(this.R, l => this.stemmer.get(l)), k = 1);
-    this.matcher && 1 < g.length && (this.P || (this.P = new RegExp("(" + this.B + ")", "g")), g = g.replace(this.P, l => this.matcher.get(l)), k = 1);
+    this.stemmer && 2 < g.length && (this.P || (this.P = new RegExp("(?!^)(" + this.M + ")$")), g = g.replace(this.P, l => this.stemmer.get(l)), k = 1);
+    this.matcher && 1 < g.length && (this.O || (this.O = new RegExp("(" + this.B + ")", "g")), g = g.replace(this.O, l => this.matcher.get(l)), k = 1);
     g && k && (g.length < this.minlength || this.filter && this.filter.has(g)) && (g = "");
     if (g && (this.mapper || this.dedupe && 1 < g.length)) {
       e = "";
@@ -211,11 +211,11 @@ G.prototype.encode = function(a) {
         g = g.replace(this.replacer[e], this.replacer[e + 1]);
       }
     }
-    this.cache && h.length <= this.A && (this.J.set(h, g), this.J.size > this.T && (this.J.clear(), this.A = this.A / 1.1 | 0));
+    this.cache && h.length <= this.A && (this.J.set(h, g), this.J.size > this.S && (this.J.clear(), this.A = this.A / 1.1 | 0));
     g && c.push(g);
   }
   this.finalize && (c = this.finalize(c) || c);
-  this.cache && a.length <= this.h && (this.H.set(a, c), this.H.size > this.T && (this.H.clear(), this.h = this.h / 1.1 | 0));
+  this.cache && a.length <= this.h && (this.H.set(a, c), this.H.size > this.S && (this.H.clear(), this.h = this.h / 1.1 | 0));
   return c;
 };
 function la(a) {
@@ -541,7 +541,7 @@ O.prototype.add = function(a, b, c, d) {
               }
             default:
               if (Q(this, m, p, f, a, c), n && 1 < d && r < d - 1) {
-                for (e = z(), g = this.S, f = p, h = Math.min(n + 1, d - r), e[f] = 1, k = 1; k < h; k++) {
+                for (e = z(), g = this.R, f = p, h = Math.min(n + 1, d - r), e[f] = 1, k = 1; k < h; k++) {
                   if ((p = b[this.rtl ? d - 1 - r - k : r + k]) && !e[p]) {
                     e[p] = 1;
                     const t = this.score ? this.score(b, f, r, p, k) : P(g + (d / 2 > g ? 0 : 1), d, r, h - 1, k - 1), x = this.bidirectional && p > f;
@@ -557,7 +557,7 @@ O.prototype.add = function(a, b, c, d) {
       b = "";
     }
   }
-  this.db && (b || this.commit_task.push({del:a}), this.U && Ca(this));
+  this.db && (b || this.commit_task.push({del:a}), this.T && Ca(this));
   return this;
 };
 function Q(a, b, c, d, e, f, g) {
@@ -1131,7 +1131,7 @@ O.prototype.search = function(a, b, c) {
     return async function() {
       for (let t, x; q < e; q++) {
         x = a[q];
-        r ? (t = await V(p, x, r), t = Ka(t, d, f, p.S, b, g, 2 === e), f && !1 === t && d.length || (r = x)) : (t = await V(p, x), t = Ka(t, d, f, p.resolution, b, g, 1 === e));
+        r ? (t = await V(p, x, r, 0, 0, !1, !1), t = Ka(t, d, f, p.R), f && !1 === t && d.length || (r = x)) : (t = await V(p, x, "", 0, 0, !1, !1), t = Ka(t, d, f, p.resolution));
         if (t) {
           return t;
         }
@@ -1155,7 +1155,7 @@ O.prototype.search = function(a, b, c) {
   }
   for (let p, t; q < e; q++) {
     t = a[q];
-    r ? (p = V(this, t, r), p = Ka(p, d, f, this.S, b, g, 2 === e), f && !1 === p && d.length || (r = t)) : (p = V(this, t), p = Ka(p, d, f, this.resolution, b, g, 1 === e));
+    r ? (p = V(this, t, r, 0, 0, !1, !1), p = Ka(p, d, f, this.R), f && !1 === p && d.length || (r = t)) : (p = V(this, t, "", 0, 0, !1, !1), p = Ka(p, d, f, this.resolution));
     if (p) {
       return p;
     }
@@ -1183,26 +1183,19 @@ function U(a, b, c, d, e, f, g) {
     return e ? h : h && h.length ? e ? R(h, c, d) : new S(h) : e ? [] : new S([]);
   }) : a && a.length ? e ? R(a, c, d) : new S(a) : e ? [] : new S([]);
 }
-function Ka(a, b, c, d, e, f, g) {
-  let h = [];
+function Ka(a, b, c, d) {
+  let e = [];
   if (a) {
     d = Math.min(a.length, d);
-    for (let k = 0, l = 0, m; k < d; k++) {
-      if (m = a[k]) {
-        if (f && m && g && (m.length <= f ? (f -= m.length, m = null) : (m = m.slice(f), f = 0)), m && (h[k] = m, g && (l += m.length, l >= e))) {
-          break;
-        }
-      }
+    for (let f = 0, g; f < d; f++) {
+      (g = a[f]) && g && (e[f] = g);
     }
-    if (h.length) {
-      if (g) {
-        return R(h, e, 0);
-      }
-      b.push(h);
+    if (e.length) {
+      b.push(e);
       return;
     }
   }
-  return !c && h;
+  return !c && e;
 }
 function V(a, b, c, d, e, f, g, h) {
   let k;
@@ -1232,7 +1225,7 @@ function V(a, b, c, d, e, f, g, h) {
     }
     b || this.reg.delete(a);
   }
-  this.db && (this.commit_task.push({del:a}), this.U && Ca(this));
+  this.db && (this.commit_task.push({del:a}), this.T && Ca(this));
   this.cache && this.cache.remove(a);
   return this;
 };
@@ -1268,7 +1261,7 @@ function La(a, b) {
     a = {};
   }
   c = a.context || {};
-  const d = a.encode || a.encoder || na;
+  const d = B(a.encoder) ? va[a.encoder] : a.encode || a.encoder || na;
   this.encoder = d.encode ? d : "object" === typeof d ? new G(d) : {encode:d};
   let e;
   this.resolution = a.resolution || 9;
@@ -1281,14 +1274,14 @@ function La(a, b) {
   this.map = e ? new L(e) : new Map();
   this.ctx = e ? new L(e) : new Map();
   this.reg = b || (this.fastupdate ? e ? new L(e) : new Map() : e ? new M(e) : new Set());
-  this.S = c.resolution || 1;
+  this.R = c.resolution || 1;
   this.rtl = d.rtl || a.rtl || !1;
   this.cache = (e = a.cache || null) && new H(e);
   this.resolve = !1 !== a.resolve;
   if (e = a.db) {
-    this.db = e.mount(this);
+    this.db = this.mount(e);
   }
-  this.U = !1 !== a.commit;
+  this.T = !1 !== a.commit;
   this.commit_task = [];
   this.commit_timer = null;
 }
@@ -1475,35 +1468,39 @@ async function Na(a) {
   }
 }
 ;let Oa = 0;
-function W(a) {
+function W(a = {}) {
+  function b(f) {
+    function g(h) {
+      h = h.data || h;
+      const k = h.id, l = k && e.h[k];
+      l && (l(h.msg), delete e.h[k]);
+    }
+    this.worker = f || Pa(c, d, a.worker);
+    if (this.worker.then) {
+      return this.worker.then(b);
+    }
+    this.h = z();
+    if (this.worker) {
+      d ? this.worker.on("message", g) : this.worker.onmessage = g;
+      if (a.config) {
+        return new Promise(function(h) {
+          e.h[++Oa] = function() {
+            h(e);
+          };
+          e.worker.postMessage({id:Oa, task:"init", factory:c, options:a});
+        });
+      }
+      this.worker.postMessage({task:"init", factory:c, options:a});
+      return this.worker;
+    }
+  }
   if (!this) {
     return new W(a);
   }
-  a || (a = {});
-  let b = "undefined" !== typeof self && (self || window)._factory;
-  b && (b = b.toString());
-  const c = "undefined" === typeof window, d = this;
-  (async function() {
-    function e(f) {
-      f = f.data || f;
-      const g = f.id, h = g && d.N[g];
-      h && (h(f.msg), delete d.N[g]);
-    }
-    this.worker = await Pa(b, c, a.worker);
-    this.N = z();
-    if (this.worker) {
-      c ? this.worker.on("message", e) : this.worker.onmessage = e;
-      if (a.config) {
-        return delete a.db, new Promise(function(f) {
-          d.N[++Oa] = function() {
-            f(d);
-          };
-          d.worker.postMessage({id:Oa, task:"init", factory:b, options:a});
-        });
-      }
-      this.worker.postMessage({task:"init", factory:b, options:a});
-    }
-  }).call(this);
+  let c = "undefined" !== typeof self ? self._factory : "undefined" !== typeof window ? window._factory : null;
+  c && (c = c.toString());
+  const d = "undefined" === typeof window, e = this;
+  this.worker = b.call(this);
 }
 X("add");
 X("append");
@@ -1511,20 +1508,20 @@ X("search");
 X("update");
 X("remove");
 function X(a) {
-  W.prototype[a] = W.prototype[a + "Async"] = function() {
+  W.prototype[a] = W.prototype[a + "Async"] = async function() {
     const b = this, c = [].slice.call(arguments);
     var d = c[c.length - 1];
     let e;
     "function" === typeof d && (e = d, c.splice(c.length - 1, 1));
     d = new Promise(function(f) {
-      b.N[++Oa] = f;
+      b.h[++Oa] = f;
       b.worker.postMessage({task:a, id:Oa, args:c});
     });
     return e ? (d.then(e), this) : d;
   };
 }
-async function Pa(a, b, c) {
-  return b ? "undefined" !== typeof module ? new (require("worker_threads")["Worker"])(__dirname + "/node/node.js") : new ((await import("worker_threads"))["Worker"])(import.meta.dirname + "/node/node.mjs") : a ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + Na.toString()], {type:"text/javascript"}))) : new window.Worker(B(c) ? c : "worker/worker.js", {type:"module"});
+function Pa(a, b, c) {
+  return b ? "undefined" !== typeof module ? new (require("worker_threads")["Worker"])(__dirname + "/node/node.js") : import("worker_threads").then(function(worker){ return new worker["Worker"]($1 + "/node/node.mjs"); }) : a ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + Na.toString()], {type:"text/javascript"}))) : new window.Worker(B(c) ? c : "worker/worker.js", {type:"module"});
 }
 ;Y.prototype.add = function(a, b, c) {
   C(a) && (b = a, a = ca(b, this.key));
@@ -1546,7 +1543,7 @@ async function Pa(a, b, c) {
     }
     if (this.tag) {
       for (d = 0; d < this.F.length; d++) {
-        var f = this.F[d], g = this.O[d];
+        var f = this.F[d], g = this.N[d];
         e = this.tag.get(g);
         let h = z();
         if ("function" === typeof f) {
@@ -1598,7 +1595,7 @@ async function Pa(a, b, c) {
             if (!m) {
               continue;
             }
-            l = [l.V];
+            l = [l.U];
           } else if (B(l) || l.constructor === String) {
             h[l] = b[l];
             continue;
@@ -1883,7 +1880,7 @@ function Ta(a) {
     return new Y(a);
   }
   const b = a.document || a.doc || a;
-  var c, d;
+  let c, d;
   this.G = [];
   this.field = [];
   this.K = [];
@@ -1895,36 +1892,13 @@ function Ta(a) {
   this.cache = (c = a.cache || null) && new H(c);
   a.cache = !1;
   this.worker = a.worker;
-  c = new Map();
-  d = b.index || b.field || b;
-  B(d) && (d = [d]);
-  for (let e = 0, f, g; e < d.length; e++) {
-    f = d[e];
-    B(f) || (g = f, f = f.field);
-    g = C(g) ? Object.assign({}, a, g) : a;
-    if (this.worker) {
-      const h = new W(g);
-      c.set(f, h);
-      h.worker || (this.worker = !1);
-    }
-    this.worker || c.set(f, new O(g, this.reg));
-    g.custom ? this.G[e] = g.custom : (this.G[e] = Va(f, this.K), g.filter && ("string" === typeof this.G[e] && (this.G[e] = new String(this.G[e])), this.G[e].I = g.filter));
-    this.field[e] = f;
-  }
-  if (this.C) {
-    d = b.store;
-    B(d) && (d = [d]);
-    for (let e = 0, f, g; e < d.length; e++) {
-      f = d[e], g = f.field || f, f.custom ? (this.C[e] = f.custom, f.custom.V = g) : (this.C[e] = Va(g, this.K), f.filter && ("string" === typeof this.C[e] && (this.C[e] = new String(this.C[e])), this.C[e].I = f.filter));
-    }
-  }
-  this.index = c;
+  this.index = Wa.call(this, a, b);
   this.tag = null;
   if (c = b.tag) {
     if ("string" === typeof c && (c = [c]), c.length) {
       this.tag = new Map();
       this.F = [];
-      this.O = [];
+      this.N = [];
       for (let e = 0, f, g; e < c.length; e++) {
         f = c[e];
         g = f.field || f;
@@ -1932,19 +1906,32 @@ function Ta(a) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
         f.custom ? this.F[e] = f.custom : (this.F[e] = Va(g, this.K), f.filter && ("string" === typeof this.F[e] && (this.F[e] = new String(this.F[e])), this.F[e].I = f.filter));
-        this.O[e] = g;
+        this.N[e] = g;
         this.tag.set(g, new Map());
       }
     }
   }
-  a.db && this.mount(a.db);
+  if (this.worker) {
+    a = [];
+    for (const e of this.index.values()) {
+      e.worker.then && a.push(e.worker);
+    }
+    if (a.length) {
+      const e = this;
+      return Promise.all(a).then(function() {
+        return e;
+      });
+    }
+  } else {
+    a.db && this.mount(a.db);
+  }
 }
 u = Y.prototype;
 u.mount = function(a) {
   let b = this.field;
   if (this.tag) {
-    for (let e = 0, f; e < this.O.length; e++) {
-      f = this.O[e];
+    for (let e = 0, f; e < this.N.length; e++) {
+      f = this.N[e];
       var c = void 0;
       this.index.set(f, c = new O({}, this.reg));
       b === this.field && (b = b.slice(0));
@@ -1981,6 +1968,31 @@ u.destroy = function() {
   }
   return Promise.all(a);
 };
+function Wa(a, b) {
+  const c = new Map();
+  let d = b.index || b.field || b;
+  B(d) && (d = [d]);
+  for (let e = 0, f, g; e < d.length; e++) {
+    f = d[e];
+    B(f) || (g = f, f = f.field);
+    g = C(g) ? Object.assign({}, a, g) : a;
+    if (this.worker) {
+      const h = new W(g);
+      h.worker ? c.set(f, h) : this.worker = !1;
+    }
+    this.worker || c.set(f, new O(g, this.reg));
+    g.custom ? this.G[e] = g.custom : (this.G[e] = Va(f, this.K), g.filter && ("string" === typeof this.G[e] && (this.G[e] = new String(this.G[e])), this.G[e].I = g.filter));
+    this.field[e] = f;
+  }
+  if (this.C) {
+    a = b.store;
+    B(a) && (a = [a]);
+    for (let e = 0, f, g; e < a.length; e++) {
+      f = a[e], g = f.field || f, f.custom ? (this.C[e] = f.custom, f.custom.U = g) : (this.C[e] = Va(g, this.K), f.filter && ("string" === typeof this.C[e] && (this.C[e] = new String(this.C[e])), this.C[e].I = f.filter));
+    }
+  }
+  return c;
+}
 function Va(a, b) {
   const c = a.split(":");
   let d = 0;
@@ -2105,10 +2117,10 @@ u.import = function(a, b) {
   }
 };
 Ba(Y.prototype);
-const Wa = "undefined" !== typeof window && (window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB), Xa = ["map", "ctx", "tag", "reg", "cfg"];
-function Ya(a, b = {}) {
+const Xa = "undefined" !== typeof window && (window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB), Ya = ["map", "ctx", "tag", "reg", "cfg"];
+function Za(a, b = {}) {
   if (!this) {
-    return new Ya(a, b);
+    return new Za(a, b);
   }
   "object" === typeof a && (b = a = a.name);
   a || console.info("Default storage space was used, because a name was not passed.");
@@ -2118,7 +2130,7 @@ function Ya(a, b = {}) {
   this.db = null;
   this.h = {};
 }
-u = Ya.prototype;
+u = Za.prototype;
 u.mount = function(a) {
   if (!a.encoder) {
     return a.mount(this);
@@ -2130,10 +2142,10 @@ u.open = function() {
   let a = this;
   navigator.storage && navigator.storage.persist();
   return this.db || new Promise(function(b, c) {
-    const d = Wa.open(a.id + (a.field ? ":" + a.field : ""), 1);
+    const d = Xa.open(a.id + (a.field ? ":" + a.field : ""), 1);
     d.onupgradeneeded = function() {
       const e = a.db = this.result;
-      Xa.forEach(f => {
+      Ya.forEach(f => {
         e.objectStoreNames.contains(f) || e.createObjectStore(f);
       });
     };
@@ -2159,16 +2171,17 @@ u.close = function() {
   this.db = null;
 };
 u.destroy = function() {
-  return Wa.deleteDatabase(this.id + (this.field ? ":" + this.field : ""));
+  return Xa.deleteDatabase(this.id + (this.field ? ":" + this.field : ""));
 };
 u.clear = function() {
-  const a = this.db.transaction(Xa, "readwrite");
-  for (let b = 0; b < Xa.length; b++) {
-    a.objectStore(Xa[b]).clear();
+  const a = this.db.transaction(Ya, "readwrite");
+  for (let b = 0; b < Ya.length; b++) {
+    a.objectStore(Ya[b]).clear();
   }
   return Z(a);
 };
 u.get = function(a, b, c = 0, d = 0, e = !0, f = !1) {
+  console.log("!!!!!!!!!!!");
   a = this.db.transaction(b ? "ctx" : "map", "readonly").objectStore(b ? "ctx" : "map").get(b ? b + ":" + a : a);
   const g = this;
   return Z(a).then(function(h) {
@@ -2268,7 +2281,7 @@ u.commit = async function(a, b, c) {
         b = !0;
         break;
       } else {
-        d[e] = f.W;
+        d[e] = f.V;
       }
     }
     b || (c || (d = d.concat(ba(a.reg))), d.length && await this.remove(d));
@@ -2348,7 +2361,7 @@ u.commit = async function(a, b, c) {
     }
   }), a.map.clear(), a.ctx.clear(), a.tag && a.tag.clear(), a.store && a.store.clear(), a.document || a.reg.clear());
 };
-function Za(a, b, c) {
+function ab(a, b, c) {
   const d = a.value;
   let e, f, g = 0;
   for (let h = 0, k; h < d.length; h++) {
@@ -2377,17 +2390,17 @@ u.remove = function(a) {
   return Promise.all([this.transaction("map", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       const c = this.result;
-      c && Za(c, a);
+      c && ab(c, a);
     };
   }), this.transaction("ctx", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       const c = this.result;
-      c && Za(c, a);
+      c && ab(c, a);
     };
   }), this.transaction("tag", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       const c = this.result;
-      c && Za(c, a, !0);
+      c && ab(c, a, !0);
     };
   }), this.transaction("reg", "readwrite", function(b) {
     for (let c = 0; c < a.length; c++) {
@@ -2407,6 +2420,6 @@ function Z(a) {
     a = null;
   });
 }
-;export default {Index:O, Charset:va, Encoder:G, Document:Y, Worker:W, Resolver:S, IndexedDB:Ya, Language:{}};
+;export default {Index:O, Charset:va, Encoder:G, Document:Y, Worker:W, Resolver:S, IndexedDB:Za, Language:{}};
 
-export const Index=O;export const  Charset=va;export const  Encoder=G;export const  Document=Y;export const  Worker=W;export const  Resolver=S;export const  IndexedDB=Ya;export const  Language={};
\ No newline at end of file
+export const Index=O;export const  Charset=va;export const  Encoder=G;export const  Document=Y;export const  Worker=W;export const  Resolver=S;export const  IndexedDB=Za;export const  Language={};
\ No newline at end of file
diff --git a/dist/flexsearch.bundle.module.min.js b/dist/flexsearch.bundle.module.min.js
index 94e3931..d12bc2a 100644
--- a/dist/flexsearch.bundle.module.min.js
+++ b/dist/flexsearch.bundle.module.min.js
@@ -15,21 +15,21 @@ function B(a){return"string"===typeof a}function C(a){return"object"===typeof a}
 ["\u0477","\u0475"],["\u04c2","\u0436"],["\u04d1","\u0430"],["\u04d3","\u0430"],["\u04d7","\u0435"],["\u04db","\u04d9"],["\u04dd","\u0436"],["\u04df","\u0437"],["\u04e3","\u0438"],["\u04e5","\u0438"],["\u04e7","\u043e"],["\u04eb","\u04e9"],["\u04ed","\u044d"],["\u04ef","\u0443"],["\u04f1","\u0443"],["\u04f3","\u0443"],["\u04f5","\u0447"]];const fa=/[^\p{L}\p{N}]+/u,ha=/(\d{3})/g,ia=/(\D)(\d{3})/g,ja=/(\d{3})(\D)/g,ka="".normalize&&/[\u0300-\u036f]/g;function F(a){if(!this)return new F(...arguments);for(let b=0;b<arguments.length;b++)this.assign(arguments[b])}
 F.prototype.assign=function(a){this.normalize=y(a.normalize,!0,this.normalize);let b=a.include,c=b||a.exclude||a.split;if("object"===typeof c){let d=!b,e="";a.include||(e+="\\p{Z}");c.letter&&(e+="\\p{L}");c.number&&(e+="\\p{N}",d=!!b);c.symbol&&(e+="\\p{S}");c.punctuation&&(e+="\\p{P}");c.control&&(e+="\\p{C}");if(c=c.char)e+="object"===typeof c?c.join(""):c;try{this.split=new RegExp("["+(b?"^":"")+e+"]+","u")}catch(f){this.split=/\s+/}this.numeric=d}else{try{this.split=y(c,fa,this.split)}catch(d){this.split=
 /\s+/}this.numeric=y(this.numeric,!0)}this.prepare=y(a.prepare,null,this.prepare);this.finalize=y(a.finalize,null,this.finalize);ka||(this.mapper=new Map(ea));this.rtl=a.rtl||!1;this.dedupe=y(a.dedupe,!0,this.dedupe);this.filter=y((c=a.filter)&&new Set(c),null,this.filter);this.matcher=y((c=a.matcher)&&new Map(c),null,this.matcher);this.mapper=y((c=a.mapper)&&new Map(c),null,this.mapper);this.stemmer=y((c=a.stemmer)&&new Map(c),null,this.stemmer);this.replacer=y(a.replacer,null,this.replacer);this.minlength=
-y(a.minlength,1,this.minlength);this.maxlength=y(a.maxlength,0,this.maxlength);if(this.cache=c=y(a.cache,!0,this.cache))this.L=null,this.T="number"===typeof c?c:2E5,this.H=new Map,this.J=new Map,this.A=this.h=128;this.B="";this.P=null;this.M="";this.R=null;if(this.matcher)for(const d of this.matcher.keys())this.B+=(this.B?"|":"")+d;if(this.stemmer)for(const d of this.stemmer.keys())this.M+=(this.M?"|":"")+d;return this};
+y(a.minlength,1,this.minlength);this.maxlength=y(a.maxlength,0,this.maxlength);if(this.cache=c=y(a.cache,!0,this.cache))this.L=null,this.S="number"===typeof c?c:2E5,this.H=new Map,this.J=new Map,this.A=this.h=128;this.B="";this.O=null;this.M="";this.P=null;if(this.matcher)for(const d of this.matcher.keys())this.B+=(this.B?"|":"")+d;if(this.stemmer)for(const d of this.stemmer.keys())this.M+=(this.M?"|":"")+d;return this};
 F.prototype.encode=function(a){if(this.cache&&a.length<=this.h)if(this.L){if(this.H.has(a))return this.H.get(a)}else this.L=setTimeout(la,0,this);this.normalize&&(a="function"===typeof this.normalize?this.normalize(a):ka?a.normalize("NFKD").replace(ka,"").toLowerCase():a.toLowerCase());this.prepare&&(a=this.prepare(a));this.numeric&&3<a.length&&(a=a.replace(ia,"$1 $2").replace(ja,"$1 $2").replace(ha,"$1 "));const b=!(this.dedupe||this.mapper||this.filter||this.matcher||this.stemmer||this.replacer);
-let c=[],d=this.split||""===this.split?a.split(this.split):a;for(let f=0,g,h;f<d.length;f++){if(!(g=h=d[f]))continue;if(g.length<this.minlength)continue;if(b){c.push(g);continue}if(this.filter&&this.filter.has(g))continue;if(this.cache&&g.length<=this.A)if(this.L){var e=this.J.get(g);if(e||""===e){e&&c.push(e);continue}}else this.L=setTimeout(la,0,this);let k;this.stemmer&&2<g.length&&(this.R||(this.R=new RegExp("(?!^)("+this.M+")$")),g=g.replace(this.R,l=>this.stemmer.get(l)),k=1);this.matcher&&
-1<g.length&&(this.P||(this.P=new RegExp("("+this.B+")","g")),g=g.replace(this.P,l=>this.matcher.get(l)),k=1);g&&k&&(g.length<this.minlength||this.filter&&this.filter.has(g))&&(g="");if(g&&(this.mapper||this.dedupe&&1<g.length)){e="";for(let l=0,m="",n,q;l<g.length;l++)n=g.charAt(l),n===m&&this.dedupe||((q=this.mapper&&this.mapper.get(n))||""===q?q===m&&this.dedupe||!(m=q)||(e+=q):e+=m=n);g=e}if(g&&this.replacer)for(e=0;g&&e<this.replacer.length;e+=2)g=g.replace(this.replacer[e],this.replacer[e+1]);
-this.cache&&h.length<=this.A&&(this.J.set(h,g),this.J.size>this.T&&(this.J.clear(),this.A=this.A/1.1|0));g&&c.push(g)}this.finalize&&(c=this.finalize(c)||c);this.cache&&a.length<=this.h&&(this.H.set(a,c),this.H.size>this.T&&(this.H.clear(),this.h=this.h/1.1|0));return c};function la(a){a.L=null;a.H.clear();a.J.clear()};function ma(a,b,c){a=("object"===typeof a?""+a.query:a).toLowerCase();let d=this.cache.get(a);if(!d){d=this.search(a,b,c);if(d.then){const e=this;d.then(function(f){e.cache.set(a,f);return f})}this.cache.set(a,d)}return d}function G(a){this.limit=a&&!0!==a?a:1E3;this.cache=new Map;this.h=""}G.prototype.set=function(a,b){this.cache.set(this.h=a,b);this.cache.size>this.limit&&this.cache.delete(this.cache.keys().next().value)};
+let c=[],d=this.split||""===this.split?a.split(this.split):a;for(let f=0,g,h;f<d.length;f++){if(!(g=h=d[f]))continue;if(g.length<this.minlength)continue;if(b){c.push(g);continue}if(this.filter&&this.filter.has(g))continue;if(this.cache&&g.length<=this.A)if(this.L){var e=this.J.get(g);if(e||""===e){e&&c.push(e);continue}}else this.L=setTimeout(la,0,this);let k;this.stemmer&&2<g.length&&(this.P||(this.P=new RegExp("(?!^)("+this.M+")$")),g=g.replace(this.P,l=>this.stemmer.get(l)),k=1);this.matcher&&
+1<g.length&&(this.O||(this.O=new RegExp("("+this.B+")","g")),g=g.replace(this.O,l=>this.matcher.get(l)),k=1);g&&k&&(g.length<this.minlength||this.filter&&this.filter.has(g))&&(g="");if(g&&(this.mapper||this.dedupe&&1<g.length)){e="";for(let l=0,m="",n,q;l<g.length;l++)n=g.charAt(l),n===m&&this.dedupe||((q=this.mapper&&this.mapper.get(n))||""===q?q===m&&this.dedupe||!(m=q)||(e+=q):e+=m=n);g=e}if(g&&this.replacer)for(e=0;g&&e<this.replacer.length;e+=2)g=g.replace(this.replacer[e],this.replacer[e+1]);
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+function Ta(a){const b=Array(a.length);for(let c=0,d;c<a.length;c++)d=a[c],b[c]={id:d,doc:this.store.get(d)};return b};function Y(a){if(!this)return new Y(a);const b=a.document||a.doc||a;let c,d;this.G=[];this.field=[];this.K=[];this.key=(c=b.key||b.id)&&Va(c,this.K)||"id";(d=a.keystore||0)&&(this.keystore=d);this.reg=(this.fastupdate=!!a.fastupdate)?d?new L(d):new Map:d?new M(d):new Set;this.C=(c=b.store||null)&&!0!==c&&[];this.store=c&&(d?new L(d):new Map);this.cache=(c=a.cache||null)&&new G(c);a.cache=!1;this.worker=a.worker;this.index=Wa.call(this,a,b);this.tag=null;if(c=b.tag)if("string"===typeof c&&(c=[c]),
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+u.import=function(a,b){if(b)switch(B(b)&&(b=JSON.parse(b)),a){case "tag":this.A=b;break;case "reg":this.fastupdate=!1;this.reg=b;for(let d=0,e;d<this.field.length;d++)e=this.index[this.field[d]],e.reg=b,e.fastupdate=!1;break;case "store":this.store=b;break;default:a=a.split(".");const c=a[0];a=a[1];c&&a&&this.index[c].import(a,b)}};Ba(Y.prototype);const Xa="undefined"!==typeof window&&(window.indexedDB||window.mozIndexedDB||window.webkitIndexedDB||window.msIndexedDB),Ya=["map","ctx","tag","reg","cfg"];
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+u.open=function(){let a=this;navigator.storage&&navigator.storage.persist();return this.db||new Promise(function(b,c){const d=Xa.open(a.id+(a.field?":"+a.field:""),1);d.onupgradeneeded=function(){const e=a.db=this.result;Ya.forEach(f=>{e.objectStoreNames.contains(f)||e.createObjectStore(f)})};d.onblocked=function(e){console.error("blocked",e);c()};d.onerror=function(e){console.error(this.error,e);c()};d.onsuccess=function(){a.db=this.result;a.db.onversionchange=function(){a.close()};b(a)}})};
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-u.commit=async function(a,b,c){if(b)await this.clear(),a.commit_task=[];else{let d=a.commit_task;a.commit_task=[];for(let e=0,f;e<d.length;e++)if(f=d[e],f.clear){await this.clear();b=!0;break}else d[e]=f.W;b||(c||(d=d.concat(ba(a.reg))),d.length&&await this.remove(d))}a.reg.size&&(await this.transaction("map","readwrite",function(d){for(const e of a.map){const f=e[0],g=e[1];g.length&&(b?d.put(g,f):d.get(f).onsuccess=function(){let h=this.result;var k;if(h&&h.length){const l=Math.max(h.length,g.length);
+u.commit=async function(a,b,c){if(b)await this.clear(),a.commit_task=[];else{let d=a.commit_task;a.commit_task=[];for(let e=0,f;e<d.length;e++)if(f=d[e],f.clear){await this.clear();b=!0;break}else d[e]=f.V;b||(c||(d=d.concat(ba(a.reg))),d.length&&await this.remove(d))}a.reg.size&&(await this.transaction("map","readwrite",function(d){for(const e of a.map){const f=e[0],g=e[1];g.length&&(b?d.put(g,f):d.get(f).onsuccess=function(){let h=this.result;var k;if(h&&h.length){const l=Math.max(h.length,g.length);
 for(let m=0,n,q;m<l;m++)if((q=g[m])&&q.length){if((n=h[m])&&n.length)for(k=0;k<q.length;k++)n.push(q[k]);else h[m]=q;k=1}}else h=g,k=1;k&&d.put(h,f)})}}),await this.transaction("ctx","readwrite",function(d){for(const e of a.ctx){const f=e[0],g=e[1];for(const h of g){const k=h[0],l=h[1];l.length&&(b?d.put(l,f+":"+k):d.get(f+":"+k).onsuccess=function(){let m=this.result;var n;if(m&&m.length){const q=Math.max(m.length,l.length);for(let r=0,p,t;r<q;r++)if((t=l[r])&&t.length){if((p=m[r])&&p.length)for(n=
 0;n<t.length;n++)p.push(t[n]);else m[r]=t;n=1}}else m=l,n=1;n&&d.put(m,f+":"+k)})}}}),a.store?await this.transaction("reg","readwrite",function(d){for(const e of a.store){const f=e[0],g=e[1];d.put("object"===typeof g?JSON.stringify(g):1,f)}}):a.bypass||await this.transaction("reg","readwrite",function(d){for(const e of a.reg.keys())d.put(1,e)}),a.tag&&await this.transaction("tag","readwrite",function(d){for(const e of a.tag){const f=e[0],g=e[1];g.length&&(d.get(f).onsuccess=function(){let h=this.result;
 h=h&&h.length?h.concat(g):g;d.put(h,f)})}}),a.map.clear(),a.ctx.clear(),a.tag&&a.tag.clear(),a.store&&a.store.clear(),a.document||a.reg.clear())};
-function Za(a,b,c){const d=a.value;let e,f,g=0;for(let h=0,k;h<d.length;h++){if(k=c?d:d[h]){for(let l=0,m,n;l<b.length;l++)if(n=b[l],m=k.indexOf(f?parseInt(n,10):n),0>m&&!f&&"string"===typeof n&&!isNaN(n)&&(m=k.indexOf(parseInt(n,10)))&&(f=1),0<=m)if(e=1,1<k.length)k.splice(m,1);else{d[h]=[];break}g+=k.length}if(c)break}g?e&&a.update(d):a.delete();a.continue()}
-u.remove=function(a){"object"!==typeof a&&(a=[a]);return Promise.all([this.transaction("map","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&Za(c,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&Za(c,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&Za(c,a,!0)}}),this.transaction("reg","readwrite",function(b){for(let c=0;c<a.length;c++)b.delete(a[c])})])};
-function Z(a){return new Promise((b,c)=>{a.onsuccess=function(){b(this.result)};a.oncomplete=function(){b(this.result)};a.onerror=c;a=null})};export default {Index:O,Charset:va,Encoder:F,Document:Y,Worker:W,Resolver:S,IndexedDB:Ya,Language:{}};
-export const Index=O;export const Charset=va;export const Encoder=F;export const Document=Y;export const Worker=W;export const Resolver=S;export const IndexedDB=Ya;export const Language={};
\ No newline at end of file
+function ab(a,b,c){const d=a.value;let e,f,g=0;for(let h=0,k;h<d.length;h++){if(k=c?d:d[h]){for(let l=0,m,n;l<b.length;l++)if(n=b[l],m=k.indexOf(f?parseInt(n,10):n),0>m&&!f&&"string"===typeof n&&!isNaN(n)&&(m=k.indexOf(parseInt(n,10)))&&(f=1),0<=m)if(e=1,1<k.length)k.splice(m,1);else{d[h]=[];break}g+=k.length}if(c)break}g?e&&a.update(d):a.delete();a.continue()}
+u.remove=function(a){"object"!==typeof a&&(a=[a]);return Promise.all([this.transaction("map","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&ab(c,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&ab(c,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&ab(c,a,!0)}}),this.transaction("reg","readwrite",function(b){for(let c=0;c<a.length;c++)b.delete(a[c])})])};
+function Z(a){return new Promise((b,c)=>{a.onsuccess=function(){b(this.result)};a.oncomplete=function(){b(this.result)};a.onerror=c;a=null})};export default {Index:O,Charset:va,Encoder:F,Document:Y,Worker:W,Resolver:S,IndexedDB:Za,Language:{}};
+export const Index=O;export const Charset=va;export const Encoder=F;export const Document=Y;export const Worker=W;export const Resolver=S;export const IndexedDB=Za;export const Language={};
\ No newline at end of file
diff --git a/dist/flexsearch.compact.debug.js b/dist/flexsearch.compact.debug.js
index 77e03a0..b698147 100644
--- a/dist/flexsearch.compact.debug.js
+++ b/dist/flexsearch.compact.debug.js
@@ -363,7 +363,7 @@ function P(a, c, b, e, d, f, g) {
 function O(a, c, b, e, d) {
   return b && 1 < a ? c + (e || 0) <= a ? b + (d || 0) : (a - 1) / (c + (e || 0)) * (b + (d || 0)) + 1 | 0 : 0;
 }
-;function Q(a, c, b) {
+;function ua(a, c, b) {
   if (1 === a.length) {
     return a = a[0], a = b || a.length > c ? c ? a.slice(b, b + c) : a.slice(b) : a;
   }
@@ -393,7 +393,7 @@ function O(a, c, b, e, d) {
   }
   return e.length ? e = 1 < e.length ? [].concat.apply([], e) : e[0] : e;
 }
-;function ua(a, c) {
+;function va(a, c) {
   const b = y(), e = [];
   for (let d = 0, f; d < c.length; d++) {
     f = c[d];
@@ -420,11 +420,11 @@ function O(a, c, b, e, d) {
   b = a.length;
   c || (c = 100);
   if (1 === b) {
-    return R.call(this, a[0], "", c, d);
+    return Q.call(this, a[0], "", c, d);
   }
   f = this.depth && !1 !== f;
   if (2 === b && f && !g) {
-    return R.call(this, a[0], a[1], c, d);
+    return Q.call(this, a[0], a[1], c, d);
   }
   var h = 0, k = 0;
   if (1 < b) {
@@ -432,7 +432,7 @@ function O(a, c, b, e, d) {
     const q = [];
     for (let t = 0, p; t < b; t++) {
       if ((p = a[t]) && !l[p]) {
-        if (g || S(this, p)) {
+        if (g || R(this, p)) {
           q.push(p), l[p] = 1;
         } else {
           return e;
@@ -450,10 +450,10 @@ function O(a, c, b, e, d) {
   }
   l = 0;
   if (1 === b) {
-    return R.call(this, a[0], "", c, d);
+    return Q.call(this, a[0], "", c, d);
   }
   if (2 === b && f && !g) {
-    return R.call(this, a[0], a[1], c, d);
+    return Q.call(this, a[0], a[1], c, d);
   }
   if (1 < b) {
     if (f) {
@@ -465,7 +465,7 @@ function O(a, c, b, e, d) {
   }
   for (let q, t; l < b; l++) {
     t = a[l];
-    m ? (q = S(this, t, m), q = va(q, e, g, this.P, c, d, 2 === b), g && !1 === q && e.length || (m = t)) : (q = S(this, t), q = va(q, e, g, this.resolution, c, d, 1 === b));
+    m ? (q = R(this, t, m), q = wa(q, e, g, this.P), g && !1 === q && e.length || (m = t)) : (q = R(this, t, ""), q = wa(q, e, g, this.resolution));
     if (q) {
       return q;
     }
@@ -480,7 +480,7 @@ function O(a, c, b, e, d) {
         return e;
       }
       if (1 === f) {
-        return Q(e[0], c, d);
+        return ua(e[0], c, d);
       }
     }
   }
@@ -539,31 +539,24 @@ function O(a, c, b, e, d) {
   }
   return e;
 };
-function R(a, c, b, e) {
-  return (a = S(this, a, c)) && a.length ? Q(a, b, e) : [];
+function Q(a, c, b, e) {
+  return (a = R(this, a, c)) && a.length ? ua(a, b, e) : [];
 }
-function va(a, c, b, e, d, f, g) {
-  let h = [];
+function wa(a, c, b, e) {
+  let d = [];
   if (a) {
     e = Math.min(a.length, e);
-    for (let k = 0, l = 0, m; k < e; k++) {
-      if (m = a[k]) {
-        if (f && m && g && (m.length <= f ? (f -= m.length, m = null) : (m = m.slice(f), f = 0)), m && (h[k] = m, g && (l += m.length, l >= d))) {
-          break;
-        }
-      }
+    for (let f = 0, g; f < e; f++) {
+      (g = a[f]) && g && (d[f] = g);
     }
-    if (h.length) {
-      if (g) {
-        return Q(h, d, 0);
-      }
-      c.push(h);
+    if (d.length) {
+      c.push(d);
       return;
     }
   }
-  return !b && h;
+  return !b && d;
 }
-function S(a, c, b) {
+function R(a, c, b) {
   let e;
   b && (e = a.bidirectional && c > b);
   a = b ? (a = a.ctx.get(e ? c : b)) && a.get(e ? b : c) : a.map.get(c);
@@ -584,14 +577,14 @@ function S(a, c, b) {
         }
       }
     } else {
-      T(this.map, a), this.depth && T(this.ctx, a);
+      S(this.map, a), this.depth && S(this.ctx, a);
     }
     c || this.reg.delete(a);
   }
   this.cache && this.cache.remove(a);
   return this;
 };
-function T(a, c) {
+function S(a, c) {
   let b = 0;
   if (a.constructor === Array) {
     for (let e = 0, d, f; e < a.length; e++) {
@@ -606,7 +599,7 @@ function T(a, c) {
     }
   } else {
     for (let e of a) {
-      const d = e[0], f = T(e[1], c);
+      const d = e[0], f = S(e[1], c);
       f ? b += f : a.delete(d);
     }
   }
@@ -623,7 +616,7 @@ function T(a, c) {
     a = {};
   }
   b = a.context || {};
-  const e = a.encode || a.encoder || ja;
+  const e = z(a.encoder) ? qa[a.encoder] : a.encode || a.encoder || ja;
   this.encoder = e.encode ? e : "object" === typeof e ? new J(e) : {encode:e};
   let d;
   this.resolution = a.resolution || 9;
@@ -658,7 +651,7 @@ u.update = function(a, c) {
   const b = this, e = this.remove(a);
   return e && e.then ? e.then(() => b.add(a, c)) : this.add(a, c);
 };
-function U(a) {
+function T(a) {
   let c = 0;
   if (a.constructor === Array) {
     for (let b = 0, e; b < a.length; b++) {
@@ -666,7 +659,7 @@ function U(a) {
     }
   } else {
     for (const b of a) {
-      const e = b[0], d = U(b[1]);
+      const e = b[0], d = T(b[1]);
       d ? c += d : a.delete(e);
     }
   }
@@ -676,8 +669,8 @@ u.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
-  U(this.map);
-  this.depth && U(this.ctx);
+  T(this.map);
+  this.depth && T(this.ctx);
   return this;
 };
 u.searchCache = ia;
@@ -787,7 +780,7 @@ u.serialize = function(a = !0) {
   return a ? "function inject(index){" + c + e + d + "}" : c + e + d;
 };
 ta(N.prototype);
-V.prototype.add = function(a, c, b) {
+U.prototype.add = function(a, c, b) {
   E(a) && (c = a, a = F(c, this.key));
   if (c && (a || 0 === a)) {
     if (!b && this.reg.has(a)) {
@@ -801,7 +794,7 @@ V.prototype.add = function(a, c, b) {
         d && e.add(a, d, !1, !0);
       } else {
         if (d = k.G, !d || d(c)) {
-          k.constructor === String ? k = ["" + k] : z(k) && (k = [k]), W(c, k, this.I, 0, e, a, k[0], b);
+          k.constructor === String ? k = ["" + k] : z(k) && (k = [k]), V(c, k, this.I, 0, e, a, k[0], b);
         }
       }
     }
@@ -852,7 +845,7 @@ V.prototype.add = function(a, c, b) {
             h[l] = c[l];
             continue;
           }
-          X(c, h, l, 0, l[0], m);
+          W(c, h, l, 0, l[0], m);
         }
       }
       this.store.set(a, h || c);
@@ -860,21 +853,21 @@ V.prototype.add = function(a, c, b) {
   }
   return this;
 };
-function X(a, c, b, e, d, f) {
+function W(a, c, b, e, d, f) {
   a = a[d];
   if (e === b.length - 1) {
     c[d] = f || a;
   } else if (a) {
     if (a.constructor === Array) {
       for (c = c[d] = Array(a.length), d = 0; d < a.length; d++) {
-        X(a, c, b, e, d);
+        W(a, c, b, e, d);
       }
     } else {
-      c = c[d] || (c[d] = y()), d = b[++e], X(a, c, b, e, d);
+      c = c[d] || (c[d] = y()), d = b[++e], W(a, c, b, e, d);
     }
   }
 }
-function W(a, c, b, e, d, f, g, h) {
+function V(a, c, b, e, d, f, g, h) {
   if (a = a[g]) {
     if (e === c.length - 1) {
       if (a.constructor === Array) {
@@ -890,15 +883,15 @@ function W(a, c, b, e, d, f, g, h) {
     } else {
       if (a.constructor === Array) {
         for (g = 0; g < a.length; g++) {
-          W(a, c, b, e, d, f, g, h);
+          V(a, c, b, e, d, f, g, h);
         }
       } else {
-        g = c[++e], W(a, c, b, e, d, f, g, h);
+        g = c[++e], V(a, c, b, e, d, f, g, h);
       }
     }
   }
 }
-;V.prototype.search = function(a, c, b, e) {
+;U.prototype.search = function(a, c, b, e) {
   b || (!c && E(a) ? (b = a, a = "") : E(c) && (b = c, c = 0));
   let d = [];
   var f = [];
@@ -954,7 +947,7 @@ function W(a, c, b, e, d, f, g, h) {
         e = [];
         if (n.length) {
           for (f = 0; f < n.length; f += 2) {
-            t = wa.call(this, n[f], n[f + 1], c, p, g), d.push({field:n[f], tag:n[f + 1], result:t});
+            t = xa.call(this, n[f], n[f + 1], c, p, g), d.push({field:n[f], tag:n[f + 1], result:t});
           }
         }
         return e.length ? Promise.all(e).then(function(v) {
@@ -1004,7 +997,7 @@ function W(a, c, b, e, d, f, g, h) {
         }
       }
       if (w) {
-        r = ua(r, n);
+        r = va(r, n);
         D = r.length;
         if (!D && !k) {
           return d;
@@ -1033,15 +1026,15 @@ function W(a, c, b, e, d, f, g, h) {
   p = [];
   for (let v = 0, r; v < f.length; v++) {
     r = d[v];
-    g && r.length && !r[0].doc && r.length && (r = xa.call(this, r));
+    g && r.length && !r[0].doc && r.length && (r = ya.call(this, r));
     if (t) {
       return r;
     }
     d[v] = {field:f[v], result:r};
   }
-  return h ? ya(d, c) : d;
+  return h ? za(d, c) : d;
 };
-function ya(a, c) {
+function za(a, c) {
   const b = [], e = y();
   for (let d = 0, f, g; d < a.length; d++) {
     f = a[d];
@@ -1060,7 +1053,7 @@ function ya(a, c) {
   }
   return b;
 }
-function wa(a, c, b, e, d) {
+function xa(a, c, b, e, d) {
   let f = this.tag.get(a);
   if (!f) {
     return console.warn("Tag '" + a + "' was not found"), [];
@@ -1069,27 +1062,27 @@ function wa(a, c, b, e, d) {
     if (a > b || e) {
       f = f.slice(e, e + b);
     }
-    d && (f = xa.call(this, f));
+    d && (f = ya.call(this, f));
     return f;
   }
 }
-function xa(a) {
+function ya(a) {
   const c = Array(a.length);
   for (let b = 0, e; b < a.length; b++) {
     e = a[b], c[b] = {id:e, doc:this.store.get(e)};
   }
   return c;
 }
-;function V(a) {
+;function U(a) {
   if (!this) {
-    return new V(a);
+    return new U(a);
   }
   const c = a.document || a.doc || a;
   var b;
   this.C = [];
   this.field = [];
   this.I = [];
-  this.key = (b = c.key || c.id) && Y(b, this.I) || "id";
+  this.key = (b = c.key || c.id) && X(b, this.I) || "id";
   this.reg = (this.fastupdate = !!a.fastupdate) ? new Map() : new Set();
   this.A = (b = c.store || null) && !0 !== b && [];
   this.store = b && new Map();
@@ -1099,13 +1092,13 @@ function xa(a) {
   let e = c.index || c.field || c;
   z(e) && (e = [e]);
   for (let d = 0, f, g; d < e.length; d++) {
-    f = e[d], z(f) || (g = f, f = f.field), g = E(g) ? Object.assign({}, a, g) : a, b.set(f, new N(g, this.reg)), g.custom ? this.C[d] = g.custom : (this.C[d] = Y(f, this.I), g.filter && ("string" === typeof this.C[d] && (this.C[d] = new String(this.C[d])), this.C[d].G = g.filter)), this.field[d] = f;
+    f = e[d], z(f) || (g = f, f = f.field), g = E(g) ? Object.assign({}, a, g) : a, b.set(f, new N(g, this.reg)), g.custom ? this.C[d] = g.custom : (this.C[d] = X(f, this.I), g.filter && ("string" === typeof this.C[d] && (this.C[d] = new String(this.C[d])), this.C[d].G = g.filter)), this.field[d] = f;
   }
   if (this.A) {
     a = c.store;
     z(a) && (a = [a]);
     for (let d = 0, f, g; d < a.length; d++) {
-      f = a[d], g = f.field || f, f.custom ? (this.A[d] = f.custom, f.custom.S = g) : (this.A[d] = Y(g, this.I), f.filter && ("string" === typeof this.A[d] && (this.A[d] = new String(this.A[d])), this.A[d].G = f.filter));
+      f = a[d], g = f.field || f, f.custom ? (this.A[d] = f.custom, f.custom.S = g) : (this.A[d] = X(g, this.I), f.filter && ("string" === typeof this.A[d] && (this.A[d] = new String(this.A[d])), this.A[d].G = f.filter));
     }
   }
   this.index = b;
@@ -1121,14 +1114,14 @@ function xa(a) {
         if (!g) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
-        f.custom ? this.B[d] = f.custom : (this.B[d] = Y(g, this.I), f.filter && ("string" === typeof this.B[d] && (this.B[d] = new String(this.B[d])), this.B[d].G = f.filter));
+        f.custom ? this.B[d] = f.custom : (this.B[d] = X(g, this.I), f.filter && ("string" === typeof this.B[d] && (this.B[d] = new String(this.B[d])), this.B[d].G = f.filter));
         this.R[d] = g;
         this.tag.set(g, new Map());
       }
     }
   }
 }
-function Y(a, c) {
+function X(a, c) {
   const b = a.split(":");
   let e = 0;
   for (let d = 0; d < b.length; d++) {
@@ -1137,7 +1130,7 @@ function Y(a, c) {
   e < b.length && (b.length = e);
   return 1 < e ? b : b[0];
 }
-u = V.prototype;
+u = U.prototype;
 u.append = function(a, c) {
   return this.add(a, c, !0);
 };
@@ -1250,10 +1243,10 @@ u.import = function(a, c) {
     }
   }
 };
-ta(V.prototype);
-const za = {Index:N, Charset:qa, Encoder:J, Document:V, Worker:null, Resolver:null, IndexedDB:null, Language:{}}, Z = self;
+ta(U.prototype);
+const Y = {Index:N, Charset:qa, Encoder:J, Document:U, Worker:null, Resolver:null, IndexedDB:null, Language:{}}, Z = self;
 let Ba;
 (Ba = Z.define) && Ba.amd ? Ba([], function() {
-  return za;
-}) : "object" === typeof Z.exports ? Z.exports = za : Z.FlexSearch = za;
+  return Y;
+}) : "object" === typeof Z.exports ? Z.exports = Y : Z.FlexSearch = Y;
 }(this));
diff --git a/dist/flexsearch.compact.min.js b/dist/flexsearch.compact.min.js
index 92d5f08..7867ad6 100644
--- a/dist/flexsearch.compact.min.js
+++ b/dist/flexsearch.compact.min.js
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+u.import=function(a,c){if(c)switch(z(c)&&(c=JSON.parse(c)),a){case "tag":this.D=c;break;case "reg":this.fastupdate=!1;this.reg=c;for(let e=0,d;e<this.field.length;e++)d=this.index[this.field[e]],d.reg=c,d.fastupdate=!1;break;case "store":this.store=c;break;default:a=a.split(".");const b=a[0];a=a[1];b&&a&&this.index[b].import(a,c)}};ta(U.prototype);const Y={Index:M,Charset:qa,Encoder:I,Document:U,Worker:null,Resolver:null,IndexedDB:null,Language:{}},Z=self;let Ba;(Ba=Z.define)&&Ba.amd?Ba([],function(){return Y}):"object"===typeof Z.exports?Z.exports=Y:Z.FlexSearch=Y;}(this));
diff --git a/dist/flexsearch.compact.module.debug.js b/dist/flexsearch.compact.module.debug.js
index 9082ee8..87c32bf 100644
--- a/dist/flexsearch.compact.module.debug.js
+++ b/dist/flexsearch.compact.module.debug.js
@@ -165,8 +165,8 @@ J.prototype.encode = function(a) {
     e && g && (e.length < this.minlength || this.filter && this.filter.has(e)) && (e = "");
     if (e && (this.mapper || this.dedupe && 1 < e.length)) {
       var d = "";
-      for (let h = 0, k = "", m, l; h < e.length; h++) {
-        m = e.charAt(h), m === k && this.dedupe || ((l = this.mapper && this.mapper.get(m)) || "" === l ? l === k && this.dedupe || !(k = l) || (d += l) : d += k = m);
+      for (let h = 0, k = "", l, n; h < e.length; h++) {
+        l = e.charAt(h), l === k && this.dedupe || ((n = this.mapper && this.mapper.get(l)) || "" === n ? n === k && this.dedupe || !(k = n) || (d += n) : d += k = l);
       }
       e = d;
     }
@@ -184,40 +184,40 @@ const K = {normalize:function(a) {
   return a.toLowerCase();
 }, dedupe:!1};
 const L = new Map([["b", "p"], ["v", "f"], ["w", "f"], ["z", "s"], ["x", "s"], ["d", "t"], ["n", "m"], ["c", "k"], ["g", "k"], ["j", "k"], ["q", "k"], ["i", "e"], ["y", "e"], ["u", "o"]]);
-const M = new Map([["ai", "ei"], ["ae", "a"], ["oe", "o"], ["ue", "u"], ["sh", "s"], ["ch", "c"], ["th", "t"], ["ph", "f"], ["pf", "f"]]), ha = [/([^aeo])h([aeo$])/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2"];
-const ia = {a:"", e:"", i:"", o:"", u:"", y:"", b:1, f:1, p:1, v:1, c:2, g:2, j:2, k:2, q:2, s:2, x:2, z:2, "\u00df":2, d:3, t:3, l:4, m:5, n:5, r:6};
+const M = new Map([["ai", "ei"], ["ae", "a"], ["oe", "o"], ["ue", "u"], ["sh", "s"], ["ch", "c"], ["th", "t"], ["ph", "f"], ["pf", "f"]]), N = [/([^aeo])h([aeo$])/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2"];
+const ha = {a:"", e:"", i:"", o:"", u:"", y:"", b:1, f:1, p:1, v:1, c:2, g:2, j:2, k:2, q:2, s:2, x:2, z:2, "\u00df":2, d:3, t:3, l:4, m:5, n:5, r:6};
+const ia = /[\x00-\x7F]+/g;
 const ja = /[\x00-\x7F]+/g;
 const ka = /[\x00-\x7F]+/g;
-const la = /[\x00-\x7F]+/g;
-var ma = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:K, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:L}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:L, replacer:ha, matcher:M}, LatinExtra:{normalize:!0, dedupe:!0, mapper:L, replacer:ha.concat([/(?!^)[aeoy]/g, ""]), matcher:M}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
+var la = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:K, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:L}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:L, replacer:N, matcher:M}, LatinExtra:{normalize:!0, dedupe:!0, mapper:L, replacer:N.concat([/(?!^)[aeoy]/g, ""]), matcher:M}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
   for (let b = 0; b < a.length; b++) {
     var c = a[b];
-    let d = c.charAt(0), f = ia[d];
-    for (let e = 1, g; e < c.length && (g = c.charAt(e), "h" === g || "w" === g || !(g = ia[g]) || g === f || (d += g, f = g, 4 !== d.length)); e++) {
+    let d = c.charAt(0), f = ha[d];
+    for (let e = 1, g; e < c.length && (g = c.charAt(e), "h" === g || "w" === g || !(g = ha[g]) || g === f || (d += g, f = g, 4 !== d.length)); e++) {
     }
     a[b] = d;
   }
 }}, ArabicDefault:{rtl:!0, normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(ja, " ");
+  return ("" + a).replace(ia, " ");
 }}, CjkDefault:{normalize:!1, dedupe:!0, split:"", prepare:function(a) {
-  return ("" + a).replace(ka, "");
+  return ("" + a).replace(ja, "");
 }}, CyrillicDefault:{normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(la, " ");
+  return ("" + a).replace(ka, " ");
 }}};
-function na(a, c, b, d, f, e, g, h) {
+function ma(a, c, b, d, f, e, g, h) {
   (d = a(b ? b + "." + d : d, JSON.stringify(g))) && d.then ? d.then(function() {
     c.export(a, c, b, f, e + 1, h);
   }) : c.export(a, c, b, f, e + 1, h);
 }
-;const oa = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
-function pa(a) {
-  N.call(a, "add");
-  N.call(a, "append");
-  N.call(a, "search");
-  N.call(a, "update");
-  N.call(a, "remove");
+;const na = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
+function oa(a) {
+  O.call(a, "add");
+  O.call(a, "append");
+  O.call(a, "search");
+  O.call(a, "update");
+  O.call(a, "remove");
 }
-function N(a) {
+function O(a) {
   this[a + "Async"] = function() {
     var c = arguments;
     const b = c[c.length - 1];
@@ -229,27 +229,27 @@ function N(a) {
   };
 }
 ;y();
-O.prototype.add = function(a, c, b, d) {
+P.prototype.add = function(a, c, b, d) {
   if (c && (a || 0 === a)) {
     if (!d && !b && this.reg.has(a)) {
       return this.update(a, c);
     }
     c = this.encoder.encode(c);
     if (d = c.length) {
-      const m = y(), l = y(), r = this.depth, t = this.resolution;
+      const l = y(), n = y(), r = this.depth, t = this.resolution;
       for (let p = 0; p < d; p++) {
-        let n = c[this.rtl ? d - 1 - p : p];
-        var f = n.length;
-        if (f && (r || !l[n])) {
-          var e = this.score ? this.score(c, n, p, null, 0) : P(t, d, p), g = "";
+        let m = c[this.rtl ? d - 1 - p : p];
+        var f = m.length;
+        if (f && (r || !n[m])) {
+          var e = this.score ? this.score(c, m, p, null, 0) : Q(t, d, p), g = "";
           switch(this.tokenize) {
             case "full":
               if (2 < f) {
                 for (e = 0; e < f; e++) {
                   for (var h = f; h > e; h--) {
-                    g = n.substring(e, h);
-                    var k = this.score ? this.score(c, n, p, g, e) : P(t, d, p, f, e);
-                    Q(this, l, g, k, a, b);
+                    g = m.substring(e, h);
+                    var k = this.score ? this.score(c, m, p, g, e) : Q(t, d, p, f, e);
+                    R(this, n, g, k, a, b);
                   }
                 }
                 break;
@@ -257,24 +257,24 @@ O.prototype.add = function(a, c, b, d) {
             case "reverse":
               if (1 < f) {
                 for (h = f - 1; 0 < h; h--) {
-                  g = n[h] + g, k = this.score ? this.score(c, n, p, g, h) : P(t, d, p, f, h), Q(this, l, g, k, a, b);
+                  g = m[h] + g, k = this.score ? this.score(c, m, p, g, h) : Q(t, d, p, f, h), R(this, n, g, k, a, b);
                 }
                 g = "";
               }
             case "forward":
               if (1 < f) {
                 for (h = 0; h < f; h++) {
-                  g += n[h], Q(this, l, g, e, a, b);
+                  g += m[h], R(this, n, g, e, a, b);
                 }
                 break;
               }
             default:
-              if (Q(this, l, n, e, a, b), r && 1 < d && p < d - 1) {
-                for (f = y(), g = this.I, e = n, h = Math.min(r + 1, d - p), f[e] = 1, k = 1; k < h; k++) {
-                  if ((n = c[this.rtl ? d - 1 - p - k : p + k]) && !f[n]) {
-                    f[n] = 1;
-                    const w = this.score ? this.score(c, e, p, n, k) : P(g + (d / 2 > g ? 0 : 1), d, p, h - 1, k - 1), B = this.bidirectional && n > e;
-                    Q(this, m, B ? e : n, w, a, b, B ? n : e);
+              if (R(this, n, m, e, a, b), r && 1 < d && p < d - 1) {
+                for (f = y(), g = this.I, e = m, h = Math.min(r + 1, d - p), f[e] = 1, k = 1; k < h; k++) {
+                  if ((m = c[this.rtl ? d - 1 - p - k : p + k]) && !f[m]) {
+                    f[m] = 1;
+                    const w = this.score ? this.score(c, e, p, m, k) : Q(g + (d / 2 > g ? 0 : 1), d, p, h - 1, k - 1), B = this.bidirectional && m > e;
+                    R(this, l, B ? e : m, w, a, b, B ? m : e);
                   }
                 }
               }
@@ -286,14 +286,14 @@ O.prototype.add = function(a, c, b, d) {
   }
   return this;
 };
-function Q(a, c, b, d, f, e, g) {
+function R(a, c, b, d, f, e, g) {
   let h = g ? a.ctx : a.map, k;
   c[b] && g && (k = c[b])[g] || (g ? (c = k || (c[b] = y()), c[g] = 1, (k = h.get(g)) ? h = k : h.set(g, h = new Map())) : c[b] = 1, (k = h.get(b)) ? h = k : h.set(b, h = []), h = h[d] || (h[d] = []), e && h.includes(f) || (h.push(f), a.fastupdate && ((c = a.reg.get(f)) ? c.push(h) : a.reg.set(f, [h]))));
 }
-function P(a, c, b, d, f) {
+function Q(a, c, b, d, f) {
   return b && 1 < a ? c + (d || 0) <= a ? b + (f || 0) : (a - 1) / (c + (d || 0)) * (b + (f || 0)) + 1 | 0 : 0;
 }
-;function R(a, c, b) {
+;function pa(a, c, b) {
   if (1 === a.length) {
     return a = a[0], a = b || a.length > c ? c ? a.slice(b, b + c) : a.slice(b) : a;
   }
@@ -336,7 +336,7 @@ function P(a, c, b, d, f) {
   }
   return d;
 }
-;O.prototype.search = function(a, c, b) {
+;P.prototype.search = function(a, c, b) {
   b || (!c && E(a) ? (b = a, a = "") : E(c) && (b = c, c = 0));
   var d = [], f = 0;
   if (b) {
@@ -358,18 +358,18 @@ function P(a, c, b, d, f) {
   }
   var h = 0, k = 0;
   if (1 < b) {
-    var m = y();
+    var l = y();
     const r = [];
     for (let t = 0, p; t < b; t++) {
-      if ((p = a[t]) && !m[p]) {
+      if ((p = a[t]) && !l[p]) {
         if (g || T(this, p)) {
-          r.push(p), m[p] = 1;
+          r.push(p), l[p] = 1;
         } else {
           return d;
         }
-        const n = p.length;
-        h = Math.max(h, n);
-        k = k ? Math.min(k, n) : n;
+        const m = p.length;
+        h = Math.max(h, m);
+        k = k ? Math.min(k, m) : m;
       }
     }
     a = r;
@@ -378,7 +378,7 @@ function P(a, c, b, d, f) {
   if (!b) {
     return d;
   }
-  m = 0;
+  l = 0;
   if (1 === b) {
     return S.call(this, a[0], "", c, f);
   }
@@ -387,44 +387,44 @@ function P(a, c, b, d, f) {
   }
   if (1 < b) {
     if (e) {
-      var l = a[0];
-      m = 1;
+      var n = a[0];
+      l = 1;
     } else {
       9 < h && 3 < h / k && a.sort(aa);
     }
   }
-  for (let r, t; m < b; m++) {
-    t = a[m];
-    l ? (r = T(this, t, l), r = ra(r, d, g, this.I, c, f, 2 === b), g && !1 === r && d.length || (l = t)) : (r = T(this, t), r = ra(r, d, g, this.resolution, c, f, 1 === b));
+  for (let r, t; l < b; l++) {
+    t = a[l];
+    n ? (r = T(this, t, n), r = ra(r, d, g, this.I), g && !1 === r && d.length || (n = t)) : (r = T(this, t, ""), r = ra(r, d, g, this.resolution));
     if (r) {
       return r;
     }
-    if (g && m === b - 1) {
+    if (g && l === b - 1) {
       e = d.length;
       if (!e) {
-        if (l) {
-          l = "";
-          m = -1;
+        if (n) {
+          n = "";
+          l = -1;
           continue;
         }
         return d;
       }
       if (1 === e) {
-        return R(d[0], c, f);
+        return pa(d[0], c, f);
       }
     }
   }
   a: {
     a = d;
     d = this.resolution;
-    l = a.length;
+    n = a.length;
     b = [];
     e = y();
-    for (let r = 0, t, p, n, w; r < d; r++) {
-      for (k = 0; k < l; k++) {
-        if (n = a[k], r < n.length && (t = n[r])) {
-          for (m = 0; m < t.length; m++) {
-            p = t[m], (h = e[p]) ? e[p]++ : (h = 0, e[p] = 1), w = b[h] || (b[h] = []), w.push(p);
+    for (let r = 0, t, p, m, w; r < d; r++) {
+      for (k = 0; k < n; k++) {
+        if (m = a[k], r < m.length && (t = m[r])) {
+          for (l = 0; l < t.length; l++) {
+            p = t[l], (h = e[p]) ? e[p]++ : (h = 0, e[p] = 1), w = b[h] || (b[h] = []), w.push(p);
           }
         }
       }
@@ -437,8 +437,8 @@ function P(a, c, b, d, f) {
           d = y();
           e = g.length;
           for (k = 0; k < e; k++) {
-            for (l = g[k], h = l.length, m = 0; m < h; m++) {
-              if (b = l[m], !d[b]) {
+            for (n = g[k], h = n.length, l = 0; l < h; l++) {
+              if (b = n[l], !d[b]) {
                 if (d[b] = 1, f) {
                   f--;
                 } else {
@@ -455,7 +455,7 @@ function P(a, c, b, d, f) {
         }
         b = c;
       } else {
-        if (a < l) {
+        if (a < n) {
           d = [];
           break a;
         }
@@ -470,28 +470,21 @@ function P(a, c, b, d, f) {
   return d;
 };
 function S(a, c, b, d) {
-  return (a = T(this, a, c)) && a.length ? R(a, b, d) : [];
+  return (a = T(this, a, c)) && a.length ? pa(a, b, d) : [];
 }
-function ra(a, c, b, d, f, e, g) {
-  let h = [];
+function ra(a, c, b, d) {
+  let f = [];
   if (a) {
     d = Math.min(a.length, d);
-    for (let k = 0, m = 0, l; k < d; k++) {
-      if (l = a[k]) {
-        if (e && l && g && (l.length <= e ? (e -= l.length, l = null) : (l = l.slice(e), e = 0)), l && (h[k] = l, g && (m += l.length, m >= f))) {
-          break;
-        }
-      }
+    for (let e = 0, g; e < d; e++) {
+      (g = a[e]) && g && (f[e] = g);
     }
-    if (h.length) {
-      if (g) {
-        return R(h, f, 0);
-      }
-      c.push(h);
+    if (f.length) {
+      c.push(f);
       return;
     }
   }
-  return !b && h;
+  return !b && f;
 }
 function T(a, c, b) {
   let d;
@@ -499,7 +492,7 @@ function T(a, c, b) {
   a = b ? (a = a.ctx.get(d ? c : b)) && a.get(d ? b : c) : a.map.get(c);
   return a;
 }
-;O.prototype.remove = function(a, c) {
+;P.prototype.remove = function(a, c) {
   const b = this.reg.size && (this.fastupdate ? this.reg.get(a) : this.reg.has(a));
   if (b) {
     if (this.fastupdate) {
@@ -541,18 +534,18 @@ function U(a, c) {
   }
   return b;
 }
-;function O(a, c) {
+;function P(a, c) {
   if (!this) {
-    return new O(a);
+    return new P(a);
   }
   if (a) {
     var b = z(a) ? a : a.preset;
-    b && (oa[b] || console.warn("Preset not found: " + b), a = Object.assign({}, oa[b], a));
+    b && (na[b] || console.warn("Preset not found: " + b), a = Object.assign({}, na[b], a));
   } else {
     a = {};
   }
   b = a.context || {};
-  const d = a.encode || a.encoder || K;
+  const d = z(a.encoder) ? la[a.encoder] : a.encode || a.encoder || K;
   this.encoder = d.encode ? d : "object" === typeof d ? new J(d) : {encode:d};
   let f;
   this.resolution = a.resolution || 9;
@@ -567,7 +560,7 @@ function U(a, c) {
   this.I = b.resolution || 1;
   this.rtl = d.rtl || a.rtl || !1;
 }
-u = O.prototype;
+u = P.prototype;
 u.clear = function() {
   this.map.clear();
   this.ctx.clear();
@@ -608,8 +601,8 @@ u.cleanup = function() {
 };
 u.export = function(a, c, b, d, f, e) {
   let g = !0;
-  "undefined" === typeof e && (g = new Promise(m => {
-    e = m;
+  "undefined" === typeof e && (g = new Promise(l => {
+    e = l;
   }));
   let h, k;
   switch(f || (f = 0)) {
@@ -617,8 +610,8 @@ u.export = function(a, c, b, d, f, e) {
       h = "reg";
       if (this.fastupdate) {
         k = y();
-        for (let m of this.reg.keys()) {
-          k[m] = 1;
+        for (let l of this.reg.keys()) {
+          k[l] = 1;
         }
       } else {
         k = this.reg;
@@ -640,7 +633,7 @@ u.export = function(a, c, b, d, f, e) {
       "undefined" === typeof b && e && e();
       return;
   }
-  na(a, c || this, b, h, d, f, k, e);
+  ma(a, c || this, b, h, d, f, k, e);
   return g;
 };
 u.import = function(a, c) {
@@ -673,11 +666,11 @@ u.serialize = function(a = !0) {
   d = "";
   for (var f of this.map.entries()) {
     var e = f[0], g = f[1], h = "";
-    for (let l = 0, r; l < g.length; l++) {
-      r = g[l] || [""];
+    for (let n = 0, r; n < g.length; n++) {
+      r = g[n] || [""];
       var k = "";
-      for (var m = 0; m < r.length; m++) {
-        k += (k ? "," : "") + ("string" === b ? '"' + r[m] + '"' : r[m]);
+      for (var l = 0; l < r.length; l++) {
+        k += (k ? "," : "") + ("string" === b ? '"' + r[l] + '"' : r[l]);
       }
       k = "[" + k + "]";
       h += (h ? "," : "") + k;
@@ -687,21 +680,21 @@ u.serialize = function(a = !0) {
   }
   d = "index.map=new Map([" + d + "]);";
   f = "";
-  for (const l of this.ctx.entries()) {
-    e = l[0];
-    g = l[1];
+  for (const n of this.ctx.entries()) {
+    e = n[0];
+    g = n[1];
     for (const r of g.entries()) {
       g = r[0];
       h = r[1];
       k = "";
       for (let t = 0, p; t < h.length; t++) {
         p = h[t] || [""];
-        m = "";
-        for (let n = 0; n < p.length; n++) {
-          m += (m ? "," : "") + ("string" === b ? '"' + p[n] + '"' : p[n]);
+        l = "";
+        for (let m = 0; m < p.length; m++) {
+          l += (l ? "," : "") + ("string" === b ? '"' + p[m] + '"' : p[m]);
         }
-        m = "[" + m + "]";
-        k += (k ? "," : "") + m;
+        l = "[" + l + "]";
+        k += (k ? "," : "") + l;
       }
       k = 'new Map([["' + g + '",[' + k + "]]])";
       k = '["' + e + '",' + k + "]";
@@ -711,7 +704,7 @@ u.serialize = function(a = !0) {
   f = "index.ctx=new Map([" + f + "]);";
   return a ? "function inject(index){" + c + d + f + "}" : c + d + f;
 };
-pa(O.prototype);
+oa(P.prototype);
 W.prototype.add = function(a, c, b) {
   E(a) && (c = a, a = F(c, this.key));
   if (c && (a || 0 === a)) {
@@ -800,25 +793,25 @@ function X(a, c, b, d, f, e, g, h) {
   b || (!c && E(a) ? (b = a, a = "") : E(c) && (b = c, c = 0));
   let f = [];
   var e = [];
-  let g, h, k, m, l;
+  let g, h, k, l, n;
   let r = 0;
   if (b) {
     b.constructor === Array && (b = {index:b});
     a = b.query || a;
     var t = b.pluck;
     h = b.merge;
-    m = t || b.field || b.index;
-    l = !1;
+    l = t || b.field || b.index;
+    n = !1;
     g = this.store && b.enrich;
     k = b.suggest;
     c = b.limit || c;
     var p = b.offset || 0;
     c || (c = 100);
-    if (l) {
-      l.constructor !== Array && (l = [l]);
-      var n = [];
-      for (let v = 0, q; v < l.length; v++) {
-        q = l[v];
+    if (n) {
+      n.constructor !== Array && (n = [n]);
+      var m = [];
+      for (let v = 0, q; v < n.length; v++) {
+        q = n[v];
         if (z(q)) {
           throw Error("A tag option can't be a string, instead it needs a { field: tag } format.");
         }
@@ -826,33 +819,33 @@ function X(a, c, b, d, f, e, g, h) {
           var w = q.tag;
           if (w.constructor === Array) {
             for (var B = 0; B < w.length; B++) {
-              n.push(q.field, w[B]);
+              m.push(q.field, w[B]);
             }
           } else {
-            n.push(q.field, w);
+            m.push(q.field, w);
           }
         } else {
           w = Object.keys(q);
           for (let C = 0, D, A; C < w.length; C++) {
             if (D = w[C], A = q[D], A.constructor === Array) {
               for (B = 0; B < A.length; B++) {
-                n.push(D, A[B]);
+                m.push(D, A[B]);
               }
             } else {
-              n.push(D, A);
+              m.push(D, A);
             }
           }
         }
       }
-      if (!n.length) {
+      if (!m.length) {
         throw Error("Your tag definition within the search options is probably wrong. No valid tags found.");
       }
-      l = n;
+      n = m;
       if (!a) {
         d = [];
-        if (n.length) {
-          for (e = 0; e < n.length; e += 2) {
-            t = sa.call(this, n[e], n[e + 1], c, p, g), f.push({field:n[e], tag:n[e + 1], result:t});
+        if (m.length) {
+          for (e = 0; e < m.length; e += 2) {
+            t = sa.call(this, m[e], m[e + 1], c, p, g), f.push({field:m[e], tag:m[e + 1], result:t});
           }
         }
         return d.length ? Promise.all(d).then(function(v) {
@@ -863,46 +856,46 @@ function X(a, c, b, d, f, e, g, h) {
         }) : f;
       }
     }
-    z(m) && (m = [m]);
+    z(l) && (l = [l]);
   }
-  m || (m = this.field);
+  l || (l = this.field);
   p = !d && (this.worker || this.db) && [];
-  for (let v = 0, q, C, D; v < m.length; v++) {
-    C = m[v];
+  for (let v = 0, q, C, D; v < l.length; v++) {
+    C = l[v];
     let A;
     z(C) || (A = C, C = A.field, a = A.query || a, c = A.limit || c, k = A.suggest || k);
     if (d) {
       q = d[v];
     } else {
-      if (n = A || b, w = this.index.get(C), l && (n.enrich = !1), p) {
-        p[v] = w.searchAsync(a, c, n);
-        n && g && (n.enrich = g);
+      if (m = A || b, w = this.index.get(C), n && (m.enrich = !1), p) {
+        p[v] = w.searchAsync(a, c, m);
+        m && g && (m.enrich = g);
         continue;
       } else {
-        q = w.search(a, c, n), n && g && (n.enrich = g);
+        q = w.search(a, c, m), m && g && (m.enrich = g);
       }
     }
     D = q && q.length;
-    if (l && D) {
-      n = [];
+    if (n && D) {
+      m = [];
       w = 0;
-      for (let G = 0, H, ua; G < l.length; G += 2) {
-        H = this.tag.get(l[G]);
+      for (let G = 0, H, ua; G < n.length; G += 2) {
+        H = this.tag.get(n[G]);
         if (!H) {
-          if (console.warn("Tag '" + l[G] + ":" + l[G + 1] + "' will be skipped because there is no field '" + l[G] + "'."), k) {
+          if (console.warn("Tag '" + n[G] + ":" + n[G + 1] + "' will be skipped because there is no field '" + n[G] + "'."), k) {
             continue;
           } else {
             return f;
           }
         }
-        if (ua = (H = H && H.get(l[G + 1])) && H.length) {
-          w++, n.push(H);
+        if (ua = (H = H && H.get(n[G + 1])) && H.length) {
+          w++, m.push(H);
         } else if (!k) {
           return f;
         }
       }
       if (w) {
-        q = qa(q, n);
+        q = qa(q, m);
         D = q.length;
         if (!D && !k) {
           return f;
@@ -912,7 +905,7 @@ function X(a, c, b, d, f, e, g, h) {
     }
     if (D) {
       e[r] = C, f.push(q), r++;
-    } else if (1 === m.length) {
+    } else if (1 === l.length) {
       return f;
     }
   }
@@ -944,15 +937,15 @@ function va(a, c) {
   for (let f = 0, e, g; f < a.length; f++) {
     e = a[f];
     g = e.result;
-    for (let h = 0, k, m, l; h < g.length; h++) {
-      if (m = g[h], k = m.id, l = d[k]) {
-        l.push(e.field);
+    for (let h = 0, k, l, n; h < g.length; h++) {
+      if (l = g[h], k = l.id, n = d[k]) {
+        n.push(e.field);
       } else {
         if (b.length === c) {
           return b;
         }
-        m.field = d[k] = [e.field];
-        b.push(m);
+        l.field = d[k] = [e.field];
+        b.push(l);
       }
     }
   }
@@ -995,7 +988,7 @@ function ta(a) {
   let d = c.index || c.field || c;
   z(d) && (d = [d]);
   for (let f = 0, e, g; f < d.length; f++) {
-    e = d[f], z(e) || (g = e, e = e.field), g = E(g) ? Object.assign({}, a, g) : a, b.set(e, new O(g, this.reg)), g.custom ? this.A[f] = g.custom : (this.A[f] = Z(e, this.D), g.filter && ("string" === typeof this.A[f] && (this.A[f] = new String(this.A[f])), this.A[f].H = g.filter)), this.field[f] = e;
+    e = d[f], z(e) || (g = e, e = e.field), g = E(g) ? Object.assign({}, a, g) : a, b.set(e, new P(g, this.reg)), g.custom ? this.A[f] = g.custom : (this.A[f] = Z(e, this.D), g.filter && ("string" === typeof this.A[f] && (this.A[f] = new String(this.A[f])), this.A[f].H = g.filter)), this.field[f] = e;
   }
   if (this.h) {
     a = c.store;
@@ -1081,7 +1074,7 @@ u.export = function(a, c, b, d, f, e) {
         e();
         return;
     }
-    na(a, this, b, c, d, f, h, e);
+    ma(a, this, b, c, d, f, h, e);
   }
   return g;
 };
@@ -1109,7 +1102,7 @@ u.import = function(a, c) {
     }
   }
 };
-pa(W.prototype);
-export default {Index:O, Charset:ma, Encoder:J, Document:W, Worker:null, Resolver:null, IndexedDB:null, Language:{}};
+oa(W.prototype);
+export default {Index:P, Charset:la, Encoder:J, Document:W, Worker:null, Resolver:null, IndexedDB:null, Language:{}};
 
-export const Index=O;export const  Charset=ma;export const  Encoder=J;export const  Document=W;export const  Worker=null;export const  Resolver=null;export const  IndexedDB=null;export const  Language={};
\ No newline at end of file
+export const Index=P;export const  Charset=la;export const  Encoder=J;export const  Document=W;export const  Worker=null;export const  Resolver=null;export const  IndexedDB=null;export const  Language={};
\ No newline at end of file
diff --git a/dist/flexsearch.compact.module.min.js b/dist/flexsearch.compact.module.min.js
index 534e4be..5053cc7 100644
--- a/dist/flexsearch.compact.module.min.js
+++ b/dist/flexsearch.compact.module.min.js
@@ -6,7 +6,7 @@
  * https://github.com/nextapps-de/flexsearch
  */
 var u;function x(a,c,b){const d=typeof b,e=typeof a;if("undefined"!==d){if("undefined"!==e){if(b){if("function"===e&&d===e)return function(h){return a(b(h))};c=a.constructor;if(c===b.constructor){if(c===Array)return b.concat(a);if(c===Map){var f=new Map(b);for(var g of a)f.set(g[0],g[1]);return f}if(c===Set){g=new Set(b);for(f of a.values())g.add(f);return g}}}return a}return b}return"undefined"===e?c:a}function y(){return Object.create(null)}function aa(a,c){return c.length-a.length}
-function A(a){return"string"===typeof a}function E(a){return"object"===typeof a}function F(a,c){if(A(c))a=a[c];else for(let b=0;a&&b<c.length;b++)a=a[c[b]];return a};var ba=[["\u00aa","a"],["\u00b2","2"],["\u00b3","3"],["\u00b9","1"],["\u00ba","o"],["\u00bc","1\u20444"],["\u00bd","1\u20442"],["\u00be","3\u20444"],["\u00e0","a"],["\u00e1","a"],["\u00e2","a"],["\u00e3","a"],["\u00e4","a"],["\u00e5","a"],["\u00e7","c"],["\u00e8","e"],["\u00e9","e"],["\u00ea","e"],["\u00eb","e"],["\u00ec","i"],["\u00ed","i"],["\u00ee","i"],["\u00ef","i"],["\u00f1","n"],["\u00f2","o"],["\u00f3","o"],["\u00f4","o"],["\u00f5","o"],["\u00f6","o"],["\u00f9","u"],["\u00fa","u"],["\u00fb",
+function z(a){return"string"===typeof a}function E(a){return"object"===typeof a}function F(a,c){if(z(c))a=a[c];else for(let b=0;a&&b<c.length;b++)a=a[c[b]];return a};var ba=[["\u00aa","a"],["\u00b2","2"],["\u00b3","3"],["\u00b9","1"],["\u00ba","o"],["\u00bc","1\u20444"],["\u00bd","1\u20442"],["\u00be","3\u20444"],["\u00e0","a"],["\u00e1","a"],["\u00e2","a"],["\u00e3","a"],["\u00e4","a"],["\u00e5","a"],["\u00e7","c"],["\u00e8","e"],["\u00e9","e"],["\u00ea","e"],["\u00eb","e"],["\u00ec","i"],["\u00ed","i"],["\u00ee","i"],["\u00ef","i"],["\u00f1","n"],["\u00f2","o"],["\u00f3","o"],["\u00f4","o"],["\u00f5","o"],["\u00f6","o"],["\u00f9","u"],["\u00fa","u"],["\u00fb",
 "u"],["\u00fc","u"],["\u00fd","y"],["\u00ff","y"],["\u0101","a"],["\u0103","a"],["\u0105","a"],["\u0107","c"],["\u0109","c"],["\u010b","c"],["\u010d","c"],["\u010f","d"],["\u0113","e"],["\u0115","e"],["\u0117","e"],["\u0119","e"],["\u011b","e"],["\u011d","g"],["\u011f","g"],["\u0121","g"],["\u0123","g"],["\u0125","h"],["\u0129","i"],["\u012b","i"],["\u012d","i"],["\u012f","i"],["\u0133","ij"],["\u0135","j"],["\u0137","k"],["\u013a","l"],["\u013c","l"],["\u013e","l"],["\u0140","l"],["\u0144","n"],
 ["\u0146","n"],["\u0148","n"],["\u0149","n"],["\u014d","o"],["\u014f","o"],["\u0151","o"],["\u0155","r"],["\u0157","r"],["\u0159","r"],["\u015b","s"],["\u015d","s"],["\u015f","s"],["\u0161","s"],["\u0163","t"],["\u0165","t"],["\u0169","u"],["\u016b","u"],["\u016d","u"],["\u016f","u"],["\u0171","u"],["\u0173","u"],["\u0175","w"],["\u0177","y"],["\u017a","z"],["\u017c","z"],["\u017e","z"],["\u017f","s"],["\u01a1","o"],["\u01b0","u"],["\u01c6","dz"],["\u01c9","lj"],["\u01cc","nj"],["\u01ce","a"],["\u01d0",
 "i"],["\u01d2","o"],["\u01d4","u"],["\u01d6","u"],["\u01d8","u"],["\u01da","u"],["\u01dc","u"],["\u01df","a"],["\u01e1","a"],["\u01e3","ae"],["\u00e6","ae"],["\u01fd","ae"],["\u01e7","g"],["\u01e9","k"],["\u01eb","o"],["\u01ed","o"],["\u01ef","\u0292"],["\u01f0","j"],["\u01f3","dz"],["\u01f5","g"],["\u01f9","n"],["\u01fb","a"],["\u01ff","\u00f8"],["\u0201","a"],["\u0203","a"],["\u0205","e"],["\u0207","e"],["\u0209","i"],["\u020b","i"],["\u020d","o"],["\u020f","o"],["\u0211","r"],["\u0213","r"],["\u0215",
@@ -17,31 +17,31 @@ I.prototype.assign=function(a){this.normalize=x(a.normalize,!0,this.normalize);l
 /\s+/}this.numeric=x(this.numeric,!0)}this.prepare=x(a.prepare,null,this.prepare);this.finalize=x(a.finalize,null,this.finalize);H||(this.mapper=new Map(ba));this.rtl=a.rtl||!1;this.dedupe=x(a.dedupe,!0,this.dedupe);this.filter=x((b=a.filter)&&new Set(b),null,this.filter);this.matcher=x((b=a.matcher)&&new Map(b),null,this.matcher);this.mapper=x((b=a.mapper)&&new Map(b),null,this.mapper);this.stemmer=x((b=a.stemmer)&&new Map(b),null,this.stemmer);this.replacer=x(a.replacer,null,this.replacer);this.minlength=
 x(a.minlength,1,this.minlength);this.maxlength=x(a.maxlength,0,this.maxlength);this.C="";this.F=null;this.B="";this.G=null;if(this.matcher)for(const d of this.matcher.keys())this.C+=(this.C?"|":"")+d;if(this.stemmer)for(const d of this.stemmer.keys())this.B+=(this.B?"|":"")+d;return this};
 I.prototype.encode=function(a){this.normalize&&(a="function"===typeof this.normalize?this.normalize(a):H?a.normalize("NFKD").replace(H,"").toLowerCase():a.toLowerCase());this.prepare&&(a=this.prepare(a));this.numeric&&3<a.length&&(a=a.replace(ea,"$1 $2").replace(fa,"$1 $2").replace(da,"$1 "));const c=!(this.dedupe||this.mapper||this.filter||this.matcher||this.stemmer||this.replacer);let b=[];a=this.split||""===this.split?a.split(this.split):a;for(let e=0,f;e<a.length;e++){if(!(f=a[e]))continue;if(f.length<
-this.minlength)continue;if(c){b.push(f);continue}if(this.filter&&this.filter.has(f))continue;let g;this.stemmer&&2<f.length&&(this.G||(this.G=new RegExp("(?!^)("+this.B+")$")),f=f.replace(this.G,h=>this.stemmer.get(h)),g=1);this.matcher&&1<f.length&&(this.F||(this.F=new RegExp("("+this.C+")","g")),f=f.replace(this.F,h=>this.matcher.get(h)),g=1);f&&g&&(f.length<this.minlength||this.filter&&this.filter.has(f))&&(f="");if(f&&(this.mapper||this.dedupe&&1<f.length)){var d="";for(let h=0,k="",m,l;h<f.length;h++)m=
-f.charAt(h),m===k&&this.dedupe||((l=this.mapper&&this.mapper.get(m))||""===l?l===k&&this.dedupe||!(k=l)||(d+=l):d+=k=m);f=d}if(f&&this.replacer)for(d=0;f&&d<this.replacer.length;d+=2)f=f.replace(this.replacer[d],this.replacer[d+1]);f&&b.push(f)}this.finalize&&(b=this.finalize(b)||b);return b};const J={normalize:function(a){return a.toLowerCase()},dedupe:!1};const K=new Map([["b","p"],["v","f"],["w","f"],["z","s"],["x","s"],["d","t"],["n","m"],["c","k"],["g","k"],["j","k"],["q","k"],["i","e"],["y","e"],["u","o"]]);const L=new Map([["ai","ei"],["ae","a"],["oe","o"],["ue","u"],["sh","s"],["ch","c"],["th","t"],["ph","f"],["pf","f"]]),ha=[/([^aeo])h([aeo$])/g,"$1$2",/([aeo])h([^aeo]|$)/g,"$1$2"];const ia={a:"",e:"",i:"",o:"",u:"",y:"",b:1,f:1,p:1,v:1,c:2,g:2,j:2,k:2,q:2,s:2,x:2,z:2,"\u00df":2,d:3,t:3,l:4,m:5,n:5,r:6};const ja=/[\x00-\x7F]+/g;const ka=/[\x00-\x7F]+/g;const la=/[\x00-\x7F]+/g;var ma={LatinExact:{normalize:!1,dedupe:!1},LatinDefault:J,LatinSimple:{normalize:!0,dedupe:!0},LatinBalance:{normalize:!0,dedupe:!0,mapper:K},LatinAdvanced:{normalize:!0,dedupe:!0,mapper:K,replacer:ha,matcher:L},LatinExtra:{normalize:!0,dedupe:!0,mapper:K,replacer:ha.concat([/(?!^)[aeoy]/g,""]),matcher:L},LatinSoundex:{normalize:!0,dedupe:!1,include:{letter:!0},finalize:function(a){for(let b=0;b<a.length;b++){var c=a[b];let d=c.charAt(0),e=ia[d];for(let f=1,g;f<c.length&&(g=c.charAt(f),"h"===g||
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+u.export=function(a,c,b,d,e,f){let g=!0;"undefined"===typeof f&&(g=new Promise(l=>{f=l}));let h,k;switch(e||(e=0)){case 0:h="reg";if(this.fastupdate){k=y();for(let l of this.reg.keys())k[l]=1}else k=this.reg;break;case 1:h="cfg";k={doc:0,opt:this.C?1:0};break;case 2:h="map";k=this.map;break;case 3:h="ctx";k=this.ctx;break;default:"undefined"===typeof b&&f&&f();return}ma(a,c||this,b,h,d,e,k,f);return g};
+u.import=function(a,c){if(c)switch(z(c)&&(c=JSON.parse(c)),a){case "cfg":this.C=!!c.opt;break;case "reg":this.fastupdate=!1;this.reg=c;break;case "map":this.map=c;break;case "ctx":this.ctx=c}};
+u.serialize=function(a=!0){if(!this.reg.size)return"";let c="",b="";for(var d of this.reg.keys())b||(b=typeof d),c+=(c?",":"")+("string"===b?'"'+d+'"':d);c="index.reg=new Set(["+c+"]);";d="";for(var e of this.map.entries()){var f=e[0],g=e[1],h="";for(let n=0,r;n<g.length;n++){r=g[n]||[""];var k="";for(var l=0;l<r.length;l++)k+=(k?",":"")+("string"===b?'"'+r[l]+'"':r[l]);k="["+k+"]";h+=(h?",":"")+k}h='["'+f+'",['+h+"]]";d+=(d?",":"")+h}d="index.map=new Map(["+d+"]);";e="";for(const n of this.ctx.entries()){f=
+n[0];g=n[1];for(const r of g.entries()){g=r[0];h=r[1];k="";for(let t=0,p;t<h.length;t++){p=h[t]||[""];l="";for(let m=0;m<p.length;m++)l+=(l?",":"")+("string"===b?'"'+p[m]+'"':p[m]);l="["+l+"]";k+=(k?",":"")+l}k='new Map([["'+g+'",['+k+"]]])";k='["'+f+'",'+k+"]";e+=(e?",":"")+k}}e="index.ctx=new Map(["+e+"]);";return a?"function inject(index){"+c+d+e+"}":c+d+e};oa(P.prototype);W.prototype.add=function(a,c,b){E(a)&&(c=a,a=F(c,this.key));if(c&&(a||0===a)){if(!b&&this.reg.has(a))return this.update(a,c);for(let e=0,f;e<this.field.length;e++){f=this.A[e];const g=this.index.get(this.field[e]);if("function"===typeof f){var d=f(c);d&&g.add(a,d,!1,!0)}else if(d=f.H,!d||d(c))f.constructor===String?f=[""+f]:z(f)&&(f=[f]),X(c,f,this.D,0,g,a,f[0],b)}if(this.store&&(!b||!this.store.has(a))){let e;if(this.h){e=y();for(let f=0,g;f<this.h.length;f++){g=this.h[f];if((b=g.H)&&!b(c))continue;
+let h;if("function"===typeof g){h=g(c);if(!h)continue;g=[g.J]}else if(z(g)||g.constructor===String){e[g]=c[g];continue}Y(c,e,g,0,g[0],h)}}this.store.set(a,e||c)}}return this};function Y(a,c,b,d,e,f){a=a[e];if(d===b.length-1)c[e]=f||a;else if(a)if(a.constructor===Array)for(c=c[e]=Array(a.length),e=0;e<a.length;e++)Y(a,c,b,d,e);else c=c[e]||(c[e]=y()),e=b[++d],Y(a,c,b,d,e)}
+function X(a,c,b,d,e,f,g,h){if(a=a[g])if(d===c.length-1){if(a.constructor===Array){if(b[d]){for(c=0;c<a.length;c++)e.add(f,a[c],!0,!0);return}a=a.join(" ")}e.add(f,a,h,!0)}else if(a.constructor===Array)for(g=0;g<a.length;g++)X(a,c,b,d,e,f,g,h);else g=c[++d],X(a,c,b,d,e,f,g,h)};W.prototype.search=function(a,c,b,d){b||(!c&&E(a)?(b=a,a=""):E(c)&&(b=c,c=0));let e=[];var f=[];let g,h,k,l,n;let r=0;if(b){b.constructor===Array&&(b={index:b});a=b.query||a;var t=b.pluck;h=b.merge;l=t||b.field||b.index;n=!1;g=this.store&&b.enrich;k=b.suggest;c=b.limit||c;var p=b.offset||0;c||(c=100);if(n){n.constructor!==Array&&(n=[n]);var m=[];for(let v=0,q;v<n.length;v++)if(q=n[v],q.field&&q.tag){var w=q.tag;if(w.constructor===Array)for(var B=0;B<w.length;B++)m.push(q.field,w[B]);else m.push(q.field,
+w)}else{w=Object.keys(q);for(let C=0,D,A;C<w.length;C++)if(D=w[C],A=q[D],A.constructor===Array)for(B=0;B<A.length;B++)m.push(D,A[B]);else m.push(D,A)}n=m;if(!a){d=[];if(m.length)for(f=0;f<m.length;f+=2)t=sa.call(this,m[f],m[f+1],c,p,g),e.push({field:m[f],tag:m[f+1],result:t});return d.length?Promise.all(d).then(function(v){for(let q=0;q<v.length;q++)e[q].result=v[q];return e}):e}}z(l)&&(l=[l])}l||(l=this.field);p=!d&&(this.worker||this.db)&&[];for(let v=0,q,C,D;v<l.length;v++){C=l[v];let A;z(C)||
+(A=C,C=A.field,a=A.query||a,c=A.limit||c,k=A.suggest||k);if(d)q=d[v];else if(m=A||b,w=this.index.get(C),n&&(m.enrich=!1),p){p[v]=w.searchAsync(a,c,m);m&&g&&(m.enrich=g);continue}else q=w.search(a,c,m),m&&g&&(m.enrich=g);D=q&&q.length;if(n&&D){m=[];w=0;for(let O=0,G,ua;O<n.length;O+=2){G=this.tag.get(n[O]);if(!G)if(k)continue;else return e;if(ua=(G=G&&G.get(n[O+1]))&&G.length)w++,m.push(G);else if(!k)return e}if(w){q=qa(q,m);D=q.length;if(!D&&!k)return e;w--}}if(D)f[r]=C,e.push(q),r++;else if(1===
+l.length)return e}if(p){const v=this;return Promise.all(p).then(function(q){return q.length?v.search(a,c,b,q):q})}if(!r)return e;if(t&&(!g||!this.store))return e[0];p=[];for(let v=0,q;v<f.length;v++){q=e[v];g&&q.length&&!q[0].doc&&q.length&&(q=ta.call(this,q));if(t)return q;e[v]={field:f[v],result:q}}return h?va(e,c):e};
+function va(a,c){const b=[],d=y();for(let e=0,f,g;e<a.length;e++){f=a[e];g=f.result;for(let h=0,k,l,n;h<g.length;h++)if(l=g[h],k=l.id,n=d[k])n.push(f.field);else{if(b.length===c)return b;l.field=d[k]=[f.field];b.push(l)}}return b}function sa(a,c,b,d,e){a=this.tag.get(a);if(!a)return[];if((c=(a=a&&a.get(c))&&a.length-d)&&0<c){if(c>b||d)a=a.slice(d,d+b);e&&(a=ta.call(this,a));return a}}
+function ta(a){const c=Array(a.length);for(let b=0,d;b<a.length;b++)d=a[b],c[b]={id:d,doc:this.store.get(d)};return c};function W(a){if(!this)return new W(a);const c=a.document||a.doc||a;var b;this.A=[];this.field=[];this.D=[];this.key=(b=c.key||c.id)&&Z(b,this.D)||"id";this.reg=(this.fastupdate=!!a.fastupdate)?new Map:new Set;this.h=(b=c.store||null)&&!0!==b&&[];this.store=b&&new Map;b=new Map;let d=c.index||c.field||c;z(d)&&(d=[d]);for(let e=0,f,g;e<d.length;e++)f=d[e],z(f)||(g=f,f=f.field),g=E(g)?Object.assign({},a,g):a,b.set(f,new P(g,this.reg)),g.custom?this.A[e]=g.custom:(this.A[e]=Z(f,this.D),g.filter&&("string"===
+typeof this.A[e]&&(this.A[e]=new String(this.A[e])),this.A[e].H=g.filter)),this.field[e]=f;if(this.h){a=c.store;z(a)&&(a=[a]);for(let e=0,f,g;e<a.length;e++)f=a[e],g=f.field||f,f.custom?(this.h[e]=f.custom,f.custom.J=g):(this.h[e]=Z(g,this.D),f.filter&&("string"===typeof this.h[e]&&(this.h[e]=new String(this.h[e])),this.h[e].H=f.filter))}this.index=b}
 function Z(a,c){const b=a.split(":");let d=0;for(let e=0;e<b.length;e++)a=b[e],"]"===a[a.length-1]&&(a=a.substring(0,a.length-2))&&(c[d]=!0),a&&(b[d++]=a);d<b.length&&(b.length=d);return 1<d?b:b[0]}u=W.prototype;u.append=function(a,c){return this.add(a,c,!0)};u.update=function(a,c){return this.remove(a).add(a,c)};u.remove=function(a){E(a)&&(a=F(a,this.key));for(const c of this.index.values())c.remove(a,!0);this.reg.has(a)&&(this.store&&this.store.delete(a),this.reg.delete(a));return this};
 u.clear=function(){for(const a of this.index.values())a.clear();this.store&&this.store.clear();return this};u.contain=function(a){return this.reg.has(a)};u.cleanup=function(){for(const a of this.index.values())a.cleanup();return this};u.get=function(a){return this.store.get(a)};u.set=function(a,c){this.store.set(a,c);return this};
-u.export=function(a,c,b,d,e,f){let g;"undefined"===typeof f&&(g=new Promise(k=>{f=k}));e||(e=0);d||(d=0);if(d<this.field.length){b=this.field[d];var h=this.index[b];c=this;h.export(a,c,e?b:"",d,e++,f)||(d++,c.export(a,c,b,d,1,f))}else{switch(e){case 1:c="tag";h=this.B;b=null;break;case 2:c="store";h=this.store;b=null;break;default:f();return}na(a,this,b,c,d,e,h,f)}return g};
-u.import=function(a,c){if(c)switch(A(c)&&(c=JSON.parse(c)),a){case "tag":this.B=c;break;case "reg":this.fastupdate=!1;this.reg=c;for(let d=0,e;d<this.field.length;d++)e=this.index[this.field[d]],e.reg=c,e.fastupdate=!1;break;case "store":this.store=c;break;default:a=a.split(".");const b=a[0];a=a[1];b&&a&&this.index[b].import(a,c)}};pa(W.prototype);export default {Index:N,Charset:ma,Encoder:I,Document:W,Worker:null,Resolver:null,IndexedDB:null,Language:{}};
-export const Index=N;export const Charset=ma;export const Encoder=I;export const Document=W;export const Worker=null;export const Resolver=null;export const IndexedDB=null;export const Language={};
\ No newline at end of file
+u.export=function(a,c,b,d,e,f){let g;"undefined"===typeof f&&(g=new Promise(k=>{f=k}));e||(e=0);d||(d=0);if(d<this.field.length){b=this.field[d];var h=this.index[b];c=this;h.export(a,c,e?b:"",d,e++,f)||(d++,c.export(a,c,b,d,1,f))}else{switch(e){case 1:c="tag";h=this.B;b=null;break;case 2:c="store";h=this.store;b=null;break;default:f();return}ma(a,this,b,c,d,e,h,f)}return g};
+u.import=function(a,c){if(c)switch(z(c)&&(c=JSON.parse(c)),a){case "tag":this.B=c;break;case "reg":this.fastupdate=!1;this.reg=c;for(let d=0,e;d<this.field.length;d++)e=this.index[this.field[d]],e.reg=c,e.fastupdate=!1;break;case "store":this.store=c;break;default:a=a.split(".");const b=a[0];a=a[1];b&&a&&this.index[b].import(a,c)}};oa(W.prototype);export default {Index:P,Charset:la,Encoder:I,Document:W,Worker:null,Resolver:null,IndexedDB:null,Language:{}};
+export const Index=P;export const Charset=la;export const Encoder=I;export const Document=W;export const Worker=null;export const Resolver=null;export const IndexedDB=null;export const Language={};
\ No newline at end of file
diff --git a/dist/flexsearch.es5.debug.js b/dist/flexsearch.es5.debug.js
index 483089e..0c6a215 100644
--- a/dist/flexsearch.es5.debug.js
+++ b/dist/flexsearch.es5.debug.js
@@ -87,7 +87,7 @@ var ia = da;
 function ja() {
   this.C = !1;
   this.A = null;
-  this.D = void 0;
+  this.F = void 0;
   this.h = 1;
   this.J = 0;
   this.B = null;
@@ -99,10 +99,10 @@ function ka(a) {
   a.C = !0;
 }
 ja.prototype.G = function(a) {
-  this.D = a;
+  this.F = a;
 };
 function la(a, b) {
-  a.B = {na:b, oa:!0};
+  a.B = {ma:b, na:!0};
   a.h = a.J;
 }
 ja.prototype.return = function(a) {
@@ -137,12 +137,12 @@ function oa(a, b, c, d) {
     if (!e.done) {
       return a.h.C = !1, e;
     }
-    var g = e.value;
+    var h = e.value;
   } catch (f) {
     return a.h.A = null, la(a.h, f), G(a);
   }
   a.h.A = null;
-  d.call(a.h, g);
+  d.call(a.h, h);
   return G(a);
 }
 function G(a) {
@@ -153,15 +153,15 @@ function G(a) {
         return a.h.C = !1, {value:b.value, done:!1};
       }
     } catch (c) {
-      a.h.D = void 0, la(a.h, c);
+      a.h.F = void 0, la(a.h, c);
     }
   }
   a.h.C = !1;
   if (a.h.B) {
     b = a.h.B;
     a.h.B = null;
-    if (b.oa) {
-      throw b.na;
+    if (b.na) {
+      throw b.ma;
     }
     return {value:b.return, done:!0};
   }
@@ -198,24 +198,24 @@ function ra(a) {
     return a.throw(d);
   }
   return new Promise(function(d, e) {
-    function g(f) {
-      f.done ? d(f.value) : Promise.resolve(f.value).then(b, c).then(g, e);
+    function h(f) {
+      f.done ? d(f.value) : Promise.resolve(f.value).then(b, c).then(h, e);
     }
-    g(a.next());
+    h(a.next());
   });
 }
 function H(a) {
   return ra(new pa(new ma(a)));
 }
 C("Symbol", function(a) {
-  function b(g) {
+  function b(h) {
     if (this instanceof b) {
       throw new TypeError("Symbol is not a constructor");
     }
-    return new c(d + (g || "") + "_" + e++, g);
+    return new c(d + (h || "") + "_" + e++, h);
   }
-  function c(g, f) {
-    this.h = g;
+  function c(h, f) {
+    this.h = h;
     ba(this, "description", {configurable:!0, writable:!0, value:f});
   }
   if (a) {
@@ -253,19 +253,19 @@ C("Promise", function(a) {
     this.B = void 0;
     this.h = [];
     this.J = !1;
-    var h = this.C();
+    var g = this.C();
     try {
-      f(h.resolve, h.reject);
+      f(g.resolve, g.reject);
     } catch (k) {
-      h.reject(k);
+      g.reject(k);
     }
   }
   function c() {
     this.h = null;
   }
   function d(f) {
-    return f instanceof b ? f : new b(function(h) {
-      h(f);
+    return f instanceof b ? f : new b(function(g) {
+      g(f);
     });
   }
   if (a) {
@@ -274,9 +274,9 @@ C("Promise", function(a) {
   c.prototype.A = function(f) {
     if (null == this.h) {
       this.h = [];
-      var h = this;
+      var g = this;
       this.B(function() {
-        h.D();
+        g.F();
       });
     }
     this.h.push(f);
@@ -285,13 +285,13 @@ C("Promise", function(a) {
   c.prototype.B = function(f) {
     e(f, 0);
   };
-  c.prototype.D = function() {
+  c.prototype.F = function() {
     for (; this.h && this.h.length;) {
       var f = this.h;
       this.h = [];
-      for (var h = 0; h < f.length; ++h) {
-        var k = f[h];
-        f[h] = null;
+      for (var g = 0; g < f.length; ++g) {
+        var k = f[g];
+        f[g] = null;
         try {
           k();
         } catch (l) {
@@ -309,104 +309,104 @@ C("Promise", function(a) {
   b.prototype.C = function() {
     function f(l) {
       return function(m) {
-        k || (k = !0, l.call(h, m));
+        k || (k = !0, l.call(g, m));
       };
     }
-    var h = this, k = !1;
-    return {resolve:f(this.ia), reject:f(this.D)};
+    var g = this, k = !1;
+    return {resolve:f(this.ha), reject:f(this.F)};
   };
-  b.prototype.ia = function(f) {
+  b.prototype.ha = function(f) {
     if (f === this) {
-      this.D(new TypeError("A Promise cannot resolve to itself"));
+      this.F(new TypeError("A Promise cannot resolve to itself"));
     } else {
       if (f instanceof b) {
-        this.ka(f);
+        this.ja(f);
       } else {
         a: {
           switch(typeof f) {
             case "object":
-              var h = null != f;
+              var g = null != f;
               break a;
             case "function":
-              h = !0;
+              g = !0;
               break a;
             default:
-              h = !1;
+              g = !1;
           }
         }
-        h ? this.ha(f) : this.G(f);
+        g ? this.ga(f) : this.G(f);
       }
     }
   };
-  b.prototype.ha = function(f) {
-    var h = void 0;
+  b.prototype.ga = function(f) {
+    var g = void 0;
     try {
-      h = f.then;
+      g = f.then;
     } catch (k) {
-      this.D(k);
+      this.F(k);
       return;
     }
-    "function" == typeof h ? this.la(h, f) : this.G(f);
+    "function" == typeof g ? this.ka(g, f) : this.G(f);
   };
-  b.prototype.D = function(f) {
-    this.da(2, f);
+  b.prototype.F = function(f) {
+    this.ca(2, f);
   };
   b.prototype.G = function(f) {
-    this.da(1, f);
+    this.ca(1, f);
   };
-  b.prototype.da = function(f, h) {
+  b.prototype.ca = function(f, g) {
     if (0 != this.A) {
-      throw Error("Cannot settle(" + f + ", " + h + "): Promise already settled in state" + this.A);
+      throw Error("Cannot settle(" + f + ", " + g + "): Promise already settled in state" + this.A);
     }
     this.A = f;
-    this.B = h;
-    2 === this.A && this.ja();
-    this.fa();
+    this.B = g;
+    2 === this.A && this.ia();
+    this.ea();
   };
-  b.prototype.ja = function() {
+  b.prototype.ia = function() {
     var f = this;
     e(function() {
-      if (f.ga()) {
-        var h = z.console;
-        "undefined" !== typeof h && h.error(f.B);
+      if (f.fa()) {
+        var g = z.console;
+        "undefined" !== typeof g && g.error(f.B);
       }
     }, 1);
   };
-  b.prototype.ga = function() {
+  b.prototype.fa = function() {
     if (this.J) {
       return !1;
     }
-    var f = z.CustomEvent, h = z.Event, k = z.dispatchEvent;
+    var f = z.CustomEvent, g = z.Event, k = z.dispatchEvent;
     if ("undefined" === typeof k) {
       return !0;
     }
-    "function" === typeof f ? f = new f("unhandledrejection", {cancelable:!0}) : "function" === typeof h ? f = new h("unhandledrejection", {cancelable:!0}) : (f = z.document.createEvent("CustomEvent"), f.initCustomEvent("unhandledrejection", !1, !0, f));
+    "function" === typeof f ? f = new f("unhandledrejection", {cancelable:!0}) : "function" === typeof g ? f = new g("unhandledrejection", {cancelable:!0}) : (f = z.document.createEvent("CustomEvent"), f.initCustomEvent("unhandledrejection", !1, !0, f));
     f.promise = this;
     f.reason = this.B;
     return k(f);
   };
-  b.prototype.fa = function() {
+  b.prototype.ea = function() {
     if (null != this.h) {
       for (var f = 0; f < this.h.length; ++f) {
-        g.A(this.h[f]);
+        h.A(this.h[f]);
       }
       this.h = null;
     }
   };
-  var g = new c();
-  b.prototype.ka = function(f) {
-    var h = this.C();
-    f.V(h.resolve, h.reject);
+  var h = new c();
+  b.prototype.ja = function(f) {
+    var g = this.C();
+    f.V(g.resolve, g.reject);
   };
-  b.prototype.la = function(f, h) {
+  b.prototype.ka = function(f, g) {
     var k = this.C();
     try {
-      f.call(h, k.resolve, k.reject);
+      f.call(g, k.resolve, k.reject);
     } catch (l) {
       k.reject(l);
     }
   };
-  b.prototype.then = function(f, h) {
+  b.prototype.then = function(f, g) {
     function k(p, q) {
       return "function" == typeof p ? function(r) {
         try {
@@ -420,44 +420,44 @@ C("Promise", function(a) {
       l = p;
       m = q;
     });
-    this.V(k(f, l), k(h, m));
+    this.V(k(f, l), k(g, m));
     return n;
   };
   b.prototype.catch = function(f) {
     return this.then(void 0, f);
   };
-  b.prototype.V = function(f, h) {
+  b.prototype.V = function(f, g) {
     function k() {
       switch(l.A) {
         case 1:
           f(l.B);
           break;
         case 2:
-          h(l.B);
+          g(l.B);
           break;
         default:
           throw Error("Unexpected state: " + l.A);
       }
     }
     var l = this;
-    null == this.h ? g.A(k) : this.h.push(k);
+    null == this.h ? h.A(k) : this.h.push(k);
     this.J = !0;
   };
   b.resolve = d;
   b.reject = function(f) {
-    return new b(function(h, k) {
+    return new b(function(g, k) {
       k(f);
     });
   };
   b.race = function(f) {
-    return new b(function(h, k) {
+    return new b(function(g, k) {
       for (var l = x(f), m = l.next(); !m.done; m = l.next()) {
-        d(m.value).V(h, k);
+        d(m.value).V(g, k);
       }
     });
   };
   b.all = function(f) {
-    var h = x(f), k = h.next();
+    var g = x(f), k = g.next();
     return k.done ? d([]) : new b(function(l, m) {
       function n(r) {
         return function(y) {
@@ -468,7 +468,7 @@ C("Promise", function(a) {
       }
       var p = [], q = 0;
       do {
-        p.push(void 0), q++, d(k.value).V(n(p.length - 1), m), k = h.next();
+        p.push(void 0), q++, d(k.value).V(n(p.length - 1), m), k = g.next();
       } while (!k.done);
     });
   };
@@ -478,8 +478,8 @@ function ta(a, b) {
   a instanceof String && (a += "");
   var c = 0, d = !1, e = {next:function() {
     if (!d && c < a.length) {
-      var g = c++;
-      return {value:b(g, a[g]), done:!1};
+      var h = c++;
+      return {value:b(h, a[h]), done:!1};
     }
     d = !0;
     return {done:!0, value:void 0};
@@ -501,7 +501,7 @@ function I(a, b) {
 }
 C("WeakMap", function(a) {
   function b(k) {
-    this.h = (h += Math.random() + 1).toString();
+    this.h = (g += Math.random() + 1).toString();
     if (k) {
       k = x(k);
       for (var l; !(l = k.next()).done;) {
@@ -521,7 +521,7 @@ C("WeakMap", function(a) {
       ba(k, f, {value:l});
     }
   }
-  function g(k) {
+  function h(k) {
     var l = Object[k];
     l && (Object[k] = function(m) {
       if (m instanceof c) {
@@ -550,10 +550,10 @@ C("WeakMap", function(a) {
     return a;
   }
   var f = "$jscomp_hidden_" + Math.random();
-  g("freeze");
-  g("preventExtensions");
-  g("seal");
-  var h = 0;
+  h("freeze");
+  h("preventExtensions");
+  h("seal");
+  var g = 0;
   b.prototype.set = function(k, l) {
     if (!d(k)) {
       throw Error("Invalid WeakMap key");
@@ -578,14 +578,14 @@ C("WeakMap", function(a) {
 });
 C("Map", function(a) {
   function b() {
-    var h = {};
-    return h.I = h.next = h.head = h;
+    var g = {};
+    return g.I = g.next = g.head = g;
   }
-  function c(h, k) {
-    var l = h[1];
+  function c(g, k) {
+    var l = g[1];
     return sa(function() {
       if (l) {
-        for (; l.head != h[1];) {
+        for (; l.head != g[1];) {
           l = l.I;
         }
         for (; l.next != l.head;) {
@@ -596,27 +596,27 @@ C("Map", function(a) {
       return {done:!0, value:void 0};
     });
   }
-  function d(h, k) {
+  function d(g, k) {
     var l = k && typeof k;
-    "object" == l || "function" == l ? g.has(k) ? l = g.get(k) : (l = "" + ++f, g.set(k, l)) : l = "p_" + k;
-    var m = h[0][l];
-    if (m && I(h[0], l)) {
-      for (h = 0; h < m.length; h++) {
-        var n = m[h];
+    "object" == l || "function" == l ? h.has(k) ? l = h.get(k) : (l = "" + ++f, h.set(k, l)) : l = "p_" + k;
+    var m = g[0][l];
+    if (m && I(g[0], l)) {
+      for (g = 0; g < m.length; g++) {
+        var n = m[g];
         if (k !== k && n.key !== n.key || k === n.key) {
-          return {id:l, list:m, index:h, F:n};
+          return {id:l, list:m, index:g, D:n};
         }
       }
     }
-    return {id:l, list:m, index:-1, F:void 0};
+    return {id:l, list:m, index:-1, D:void 0};
   }
-  function e(h) {
+  function e(g) {
     this[0] = {};
     this[1] = b();
     this.size = 0;
-    if (h) {
-      h = x(h);
-      for (var k; !(k = h.next()).done;) {
+    if (g) {
+      g = x(g);
+      for (var k; !(k = g.next()).done;) {
         k = k.value, this.set(k[0], k[1]);
       }
     }
@@ -626,12 +626,12 @@ C("Map", function(a) {
       return !1;
     }
     try {
-      var h = Object.seal({x:4}), k = new a(x([[h, "s"]]));
-      if ("s" != k.get(h) || 1 != k.size || k.get({x:4}) || k.set({x:4}, "t") != k || 2 != k.size) {
+      var g = Object.seal({x:4}), k = new a(x([[g, "s"]]));
+      if ("s" != k.get(g) || 1 != k.size || k.get({x:4}) || k.set({x:4}, "t") != k || 2 != k.size) {
         return !1;
       }
       var l = k.entries(), m = l.next();
-      if (m.done || m.value[0] != h || "s" != m.value[1]) {
+      if (m.done || m.value[0] != g || "s" != m.value[1]) {
         return !1;
       }
       m = l.next();
@@ -642,47 +642,47 @@ C("Map", function(a) {
   }()) {
     return a;
   }
-  var g = new WeakMap();
-  e.prototype.set = function(h, k) {
-    h = 0 === h ? 0 : h;
-    var l = d(this, h);
+  var h = new WeakMap();
+  e.prototype.set = function(g, k) {
+    g = 0 === g ? 0 : g;
+    var l = d(this, g);
     l.list || (l.list = this[0][l.id] = []);
-    l.F ? l.F.value = k : (l.F = {next:this[1], I:this[1].I, head:this[1], key:h, value:k}, l.list.push(l.F), this[1].I.next = l.F, this[1].I = l.F, this.size++);
+    l.D ? l.D.value = k : (l.D = {next:this[1], I:this[1].I, head:this[1], key:g, value:k}, l.list.push(l.D), this[1].I.next = l.D, this[1].I = l.D, this.size++);
     return this;
   };
-  e.prototype.delete = function(h) {
-    h = d(this, h);
-    return h.F && h.list ? (h.list.splice(h.index, 1), h.list.length || delete this[0][h.id], h.F.I.next = h.F.next, h.F.next.I = h.F.I, h.F.head = null, this.size--, !0) : !1;
+  e.prototype.delete = function(g) {
+    g = d(this, g);
+    return g.D && g.list ? (g.list.splice(g.index, 1), g.list.length || delete this[0][g.id], g.D.I.next = g.D.next, g.D.next.I = g.D.I, g.D.head = null, this.size--, !0) : !1;
   };
   e.prototype.clear = function() {
     this[0] = {};
     this[1] = this[1].I = b();
     this.size = 0;
   };
-  e.prototype.has = function(h) {
-    return !!d(this, h).F;
+  e.prototype.has = function(g) {
+    return !!d(this, g).D;
   };
-  e.prototype.get = function(h) {
-    return (h = d(this, h).F) && h.value;
+  e.prototype.get = function(g) {
+    return (g = d(this, g).D) && g.value;
   };
   e.prototype.entries = function() {
-    return c(this, function(h) {
-      return [h.key, h.value];
+    return c(this, function(g) {
+      return [g.key, g.value];
     });
   };
   e.prototype.keys = function() {
-    return c(this, function(h) {
-      return h.key;
+    return c(this, function(g) {
+      return g.key;
     });
   };
   e.prototype.values = function() {
-    return c(this, function(h) {
-      return h.value;
+    return c(this, function(g) {
+      return g.value;
     });
   };
-  e.prototype.forEach = function(h, k) {
+  e.prototype.forEach = function(g, k) {
     for (var l = this.entries(), m; !(m = l.next()).done;) {
-      m = m.value, h.call(k, m[1], m[0], this);
+      m = m.value, g.call(k, m[1], m[0], this);
     }
   };
   e.prototype[Symbol.iterator] = e.prototype.entries;
@@ -716,12 +716,12 @@ C("Set", function(a) {
       if (!d.has(c) || 1 != d.size || d.add(c) != d || 1 != d.size || d.add({x:4}) != d || 2 != d.size) {
         return !1;
       }
-      var e = d.entries(), g = e.next();
-      if (g.done || g.value[0] != c || g.value[1] != c) {
+      var e = d.entries(), h = e.next();
+      if (h.done || h.value[0] != c || h.value[1] != c) {
         return !1;
       }
-      g = e.next();
-      return g.done || g.value[0] == c || 4 != g.value[0].x || g.value[1] != g.value[0] ? !1 : e.next().done;
+      h = e.next();
+      return h.done || h.value[0] == c || 4 != h.value[0].x || h.value[1] != h.value[0] ? !1 : e.next().done;
     } catch (f) {
       return !1;
     }
@@ -756,8 +756,8 @@ C("Set", function(a) {
   b.prototype[Symbol.iterator] = b.prototype.values;
   b.prototype.forEach = function(c, d) {
     var e = this;
-    this.h.forEach(function(g) {
-      return c.call(d, g, g, e);
+    this.h.forEach(function(h) {
+      return c.call(d, h, h, e);
     });
   };
   return b;
@@ -774,8 +774,8 @@ C("Array.prototype.includes", function(a) {
     var e = d.length;
     c = c || 0;
     for (0 > c && (c = Math.max(c + e, 0)); c < e; c++) {
-      var g = d[c];
-      if (g === b || Object.is(g, b)) {
+      var h = d[c];
+      if (h === b || Object.is(h, b)) {
         return !0;
       }
     }
@@ -830,8 +830,8 @@ function K(a, b, c) {
     if ("undefined" !== e) {
       if (c) {
         if ("function" === e && d === e) {
-          return function(g) {
-            return a(c(g));
+          return function(h) {
+            return a(c(h));
           };
         }
         b = a.constructor;
@@ -912,15 +912,15 @@ function Q(a) {
   if (!this) {
     var b = Function.prototype.bind, c = b.apply, d = [null], e = d.concat;
     if (arguments instanceof Array) {
-      var g = arguments;
+      var h = arguments;
     } else {
-      g = x(arguments);
-      for (var f, h = []; !(f = g.next()).done;) {
-        h.push(f.value);
+      h = x(arguments);
+      for (var f, g = []; !(f = h.next()).done;) {
+        g.push(f.value);
       }
-      g = h;
+      h = g;
     }
-    return new (c.call(b, Q, e.call(d, g)))();
+    return new (c.call(b, Q, e.call(d, h)))();
   }
   for (b = 0; b < arguments.length; b++) {
     this.assign(arguments[b]);
@@ -942,14 +942,14 @@ Q.prototype.assign = function(a) {
     }
     try {
       this.split = new RegExp("[" + (b ? "^" : "") + e + "]+", "u");
-    } catch (g) {
+    } catch (h) {
       this.split = /\s+/;
     }
     this.numeric = d;
   } else {
     try {
       this.split = K(c, Aa, this.split);
-    } catch (g) {
+    } catch (h) {
       this.split = /\s+/;
     }
     this.numeric = K(this.numeric, !0);
@@ -970,7 +970,7 @@ Q.prototype.assign = function(a) {
     this.U = null, this.J = "number" === typeof c ? c : 2e5, this.N = new Map(), this.S = new Map(), this.A = this.h = 128;
   }
   this.B = "";
-  this.D = null;
+  this.F = null;
   this.C = "";
   this.G = null;
   if (this.matcher) {
@@ -999,8 +999,8 @@ Q.prototype.encode = function(a) {
   this.normalize && (a = "function" === typeof this.normalize ? this.normalize(a) : Ea ? a.normalize("NFKD").replace(Ea, "").toLowerCase() : a.toLowerCase());
   this.prepare && (a = this.prepare(a));
   this.numeric && 3 < a.length && (a = a.replace(Ca, "$1 $2").replace(Da, "$1 $2").replace(Ba, "$1 "));
-  for (var c = !(this.dedupe || this.mapper || this.filter || this.matcher || this.stemmer || this.replacer), d = [], e = this.split || "" === this.split ? a.split(this.split) : a, g = 0, f = void 0, h = void 0; g < e.length; g++) {
-    if ((f = h = e[g]) && !(f.length < this.minlength)) {
+  for (var c = !(this.dedupe || this.mapper || this.filter || this.matcher || this.stemmer || this.replacer), d = [], e = this.split || "" === this.split ? a.split(this.split) : a, h = 0, f = void 0, g = void 0; h < e.length; h++) {
+    if ((f = g = e[h]) && !(f.length < this.minlength)) {
       if (c) {
         d.push(f);
       } else {
@@ -1020,7 +1020,7 @@ Q.prototype.encode = function(a) {
           this.stemmer && 2 < f.length && (this.G || (this.G = new RegExp("(?!^)(" + this.C + ")$")), f = f.replace(this.G, function(q) {
             return b.stemmer.get(q);
           }), k = 1);
-          this.matcher && 1 < f.length && (this.D || (this.D = new RegExp("(" + this.B + ")", "g")), f = f.replace(this.D, function(q) {
+          this.matcher && 1 < f.length && (this.F || (this.F = new RegExp("(" + this.B + ")", "g")), f = f.replace(this.F, function(q) {
             return b.matcher.get(q);
           }), k = 1);
           f && k && (f.length < this.minlength || this.filter && this.filter.has(f)) && (f = "");
@@ -1036,7 +1036,7 @@ Q.prototype.encode = function(a) {
               f = f.replace(this.replacer[k], this.replacer[k + 1]);
             }
           }
-          this.cache && h.length <= this.A && (this.S.set(h, f), this.S.size > this.J && (this.S.clear(), this.A = this.A / 1.1 | 0));
+          this.cache && g.length <= this.A && (this.S.set(g, f), this.S.size > this.J && (this.S.clear(), this.A = this.A / 1.1 | 0));
           f && d.push(f);
         }
       }
@@ -1058,9 +1058,9 @@ function Fa(a) {
     d = this.search(a, b, c);
     if (d.then) {
       var e = this;
-      d.then(function(g) {
-        e.cache.set(a, g);
-        return g;
+      d.then(function(h) {
+        e.cache.set(a, h);
+        return h;
       });
     }
     this.cache.set(a, d);
@@ -1103,7 +1103,7 @@ var Na = /[\x00-\x7F]+/g;
 var Oa = /[\x00-\x7F]+/g;
 var Pa = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:Ha, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:Ia}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:Ia, replacer:Ka, matcher:Ja}, LatinExtra:{normalize:!0, dedupe:!0, mapper:Ia, replacer:Ka.concat([/(?!^)[aeoy]/g, ""]), matcher:Ja}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
   for (var b = 0; b < a.length; b++) {
-    for (var c = a[b], d = c.charAt(0), e = La[d], g = 1, f; g < c.length && (f = c.charAt(g), "h" === f || "w" === f || !(f = La[f]) || f === e || (d += f, e = f, 4 !== d.length)); g++) {
+    for (var c = a[b], d = c.charAt(0), e = La[d], h = 1, f; h < c.length && (f = c.charAt(h), "h" === f || "w" === f || !(f = La[f]) || f === e || (d += f, e = f, 4 !== d.length)); h++) {
     }
     a[b] = d;
   }
@@ -1115,8 +1115,8 @@ var Pa = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:Ha, LatinSimple:{no
   return ("" + a).replace(Oa, " ");
 }}};
 function Qa(a, b, c, d) {
-  for (var e = [], g = 0, f; g < a.index.length; g++) {
-    if (f = a.index[g], b >= f.length) {
+  for (var e = [], h = 0, f; h < a.index.length; h++) {
+    if (f = a.index[h], b >= f.length) {
       b -= f.length;
     } else {
       b = f[d ? "splice" : "slice"](b, c);
@@ -1156,21 +1156,21 @@ function S(a) {
     }
     if ("indexOf" === d) {
       return function(e) {
-        for (var g = 0, f = 0, h, k; f < b.index.length; f++) {
-          h = b.index[f];
-          k = h.indexOf(e);
+        for (var h = 0, f = 0, g, k; f < b.index.length; f++) {
+          g = b.index[f];
+          k = g.indexOf(e);
           if (0 <= k) {
-            return g + k;
+            return h + k;
           }
-          g += h.length;
+          h += g.length;
         }
         return -1;
       };
     }
     if ("includes" === d) {
       return function(e) {
-        for (var g = 0; g < b.index.length; g++) {
-          if (b.index[g].includes(e)) {
+        for (var h = 0; h < b.index.length; h++) {
+          if (b.index[h].includes(e)) {
             return !0;
           }
         }
@@ -1178,13 +1178,13 @@ function S(a) {
       };
     }
     if ("slice" === d) {
-      return function(e, g) {
-        return Qa(b, e || 0, g || b.length, !1);
+      return function(e, h) {
+        return Qa(b, e || 0, h || b.length, !1);
       };
     }
     if ("splice" === d) {
-      return function(e, g) {
-        return Qa(b, e || 0, g || b.length, !0);
+      return function(e, h) {
+        return Qa(b, e || 0, h || b.length, !0);
       };
     }
     if ("constructor" === d) {
@@ -1254,7 +1254,7 @@ u.clear = U.prototype.clear = function() {
   this.size = 0;
 };
 u.values = U.prototype.values = function Ta() {
-  var b, c = this, d, e, g;
+  var b, c = this, d, e, h;
   return qa(Ta, function(f) {
     switch(f.h) {
       case 1:
@@ -1272,15 +1272,15 @@ u.values = U.prototype.values = function Ta() {
           f.h = 2;
           break;
         }
-        g = e.value;
-        return F(f, g, 6);
+        h = e.value;
+        return F(f, h, 6);
       case 6:
         e = d.next(), f.h = 5;
     }
   });
 };
 u.keys = U.prototype.keys = function Ua() {
-  var b, c = this, d, e, g;
+  var b, c = this, d, e, h;
   return qa(Ua, function(f) {
     switch(f.h) {
       case 1:
@@ -1298,15 +1298,15 @@ u.keys = U.prototype.keys = function Ua() {
           f.h = 2;
           break;
         }
-        g = e.value;
-        return F(f, g, 6);
+        h = e.value;
+        return F(f, h, 6);
       case 6:
         e = d.next(), f.h = 5;
     }
   });
 };
 u.entries = U.prototype.entries = function Va() {
-  var b, c = this, d, e, g;
+  var b, c = this, d, e, h;
   return qa(Va, function(f) {
     switch(f.h) {
       case 1:
@@ -1324,8 +1324,8 @@ u.entries = U.prototype.entries = function Va() {
           f.h = 2;
           break;
         }
-        g = e.value;
-        return F(f, g, 6);
+        h = e.value;
+        return F(f, h, 6);
       case 6:
         e = d.next(), f.h = 5;
     }
@@ -1344,10 +1344,10 @@ function Sa(a) {
 function Ra() {
   throw Error("The keystore is limited to 32 for EcmaScript5");
 }
-;function Wa(a, b, c, d, e, g, f, h) {
+;function Wa(a, b, c, d, e, h, f, g) {
   (d = a(c ? c + "." + d : d, JSON.stringify(f))) && d.then ? d.then(function() {
-    b.export(a, b, c, e, g + 1, h);
-  }) : b.export(a, b, c, e, g + 1, h);
+    b.export(a, b, c, e, h + 1, g);
+  }) : b.export(a, b, c, e, h + 1, g);
 }
 ;var Xa = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
 function Ya(a) {
@@ -1377,18 +1377,18 @@ V.prototype.add = function(a, b, c, d) {
     }
     b = this.encoder.encode(b);
     if (d = b.length) {
-      for (var e = L(), g = L(), f = this.depth, h = this.resolution, k = 0; k < d; k++) {
+      for (var e = L(), h = L(), f = this.depth, g = this.resolution, k = 0; k < d; k++) {
         var l = b[this.rtl ? d - 1 - k : k], m = l.length;
-        if (m && (f || !g[l])) {
-          var n = this.score ? this.score(b, l, k, null, 0) : $a(h, d, k), p = "";
+        if (m && (f || !h[l])) {
+          var n = this.score ? this.score(b, l, k, null, 0) : $a(g, d, k), p = "";
           switch(this.tokenize) {
             case "full":
               if (2 < m) {
                 for (n = 0; n < m; n++) {
                   for (var q = m; q > n; q--) {
                     p = l.substring(n, q);
-                    var r = this.score ? this.score(b, l, k, p, n) : $a(h, d, k, m, n);
-                    ab(this, g, p, r, a, c);
+                    var r = this.score ? this.score(b, l, k, p, n) : $a(g, d, k, m, n);
+                    ab(this, h, p, r, a, c);
                   }
                 }
                 break;
@@ -1396,20 +1396,20 @@ V.prototype.add = function(a, b, c, d) {
             case "reverse":
               if (1 < m) {
                 for (q = m - 1; 0 < q; q--) {
-                  p = l[q] + p, r = this.score ? this.score(b, l, k, p, q) : $a(h, d, k, m, q), ab(this, g, p, r, a, c);
+                  p = l[q] + p, r = this.score ? this.score(b, l, k, p, q) : $a(g, d, k, m, q), ab(this, h, p, r, a, c);
                 }
                 p = "";
               }
             case "forward":
               if (1 < m) {
                 for (q = 0; q < m; q++) {
-                  p += l[q], ab(this, g, p, n, a, c);
+                  p += l[q], ab(this, h, p, n, a, c);
                 }
                 break;
               }
             default:
-              if (ab(this, g, l, n, a, c), f && 1 < d && k < d - 1) {
-                for (m = L(), p = this.ba, n = l, q = Math.min(f + 1, d - k), r = m[n] = 1; r < q; r++) {
+              if (ab(this, h, l, n, a, c), f && 1 < d && k < d - 1) {
+                for (m = L(), p = this.aa, n = l, q = Math.min(f + 1, d - k), r = m[n] = 1; r < q; r++) {
                   if ((l = b[this.rtl ? d - 1 - k - r : k + r]) && !m[l]) {
                     m[l] = 1;
                     var y = this.score ? this.score(b, n, k, l, r) : $a(p + (d / 2 > p ? 0 : 1), d, k, q - 1, r - 1), v = this.bidirectional && l > n;
@@ -1425,24 +1425,24 @@ V.prototype.add = function(a, b, c, d) {
       b = "";
     }
   }
-  this.db && (b || this.commit_task.push({del:a}), this.ea && bb(this));
+  this.db && (b || this.commit_task.push({del:a}), this.da && bb(this));
   return this;
 };
-function ab(a, b, c, d, e, g, f) {
-  var h = f ? a.ctx : a.map, k;
+function ab(a, b, c, d, e, h, f) {
+  var g = f ? a.ctx : a.map, k;
   if (!b[c] || !f || !(k = b[c])[f]) {
-    if (f ? (b = k || (b[c] = L()), b[f] = 1, (k = h.get(f)) ? h = k : h.set(f, h = new Map())) : b[c] = 1, (k = h.get(c)) ? h = k : h.set(c, h = k = []), h = h[d] || (h[d] = []), !g || !h.includes(e)) {
-      if (h.length === Math.pow(2, 31) - 1) {
-        b = new S(h);
+    if (f ? (b = k || (b[c] = L()), b[f] = 1, (k = g.get(f)) ? g = k : g.set(f, g = new Map())) : b[c] = 1, (k = g.get(c)) ? g = k : g.set(c, g = k = []), g = g[d] || (g[d] = []), !h || !g.includes(e)) {
+      if (g.length === Math.pow(2, 31) - 1) {
+        b = new S(g);
         if (a.fastupdate) {
-          for (c = x(a.reg.values()), g = c.next(); !g.done; g = c.next()) {
-            g = g.value, g.includes(h) && (g[g.indexOf(h)] = b);
+          for (c = x(a.reg.values()), h = c.next(); !h.done; h = c.next()) {
+            h = h.value, h.includes(g) && (h[h.indexOf(g)] = b);
           }
         }
-        k[d] = h = b;
+        k[d] = g = b;
       }
-      h.push(e);
-      a.fastupdate && ((d = a.reg.get(e)) ? d.push(h) : a.reg.set(e, [h]));
+      g.push(e);
+      a.fastupdate && ((d = a.reg.get(e)) ? d.push(g) : a.reg.set(e, [g]));
     }
   }
 }
@@ -1453,24 +1453,24 @@ function $a(a, b, c, d, e) {
   if (1 === a.length) {
     return a = a[0], a = c || a.length > b ? b ? a.slice(c, c + b) : a.slice(c) : a, d ? cb(a) : a;
   }
-  for (var e = [], g = 0, f = void 0, h = void 0; g < a.length; g++) {
-    if ((f = a[g]) && (h = f.length)) {
+  for (var e = [], h = 0, f = void 0, g = void 0; h < a.length; h++) {
+    if ((f = a[h]) && (g = f.length)) {
       if (c) {
-        if (c >= h) {
-          c -= h;
+        if (c >= g) {
+          c -= g;
           continue;
         }
-        c < h && (f = b ? f.slice(c, c + b) : f.slice(c), h = f.length, c = 0);
+        c < g && (f = b ? f.slice(c, c + b) : f.slice(c), g = f.length, c = 0);
       }
       if (e.length) {
-        h > b && (f = f.slice(0, b), h = f.length), e.push(f);
+        g > b && (f = f.slice(0, b), g = f.length), e.push(f);
       } else {
-        if (h >= b) {
-          return h > b && (f = f.slice(0, b)), d ? cb(f) : f;
+        if (g >= b) {
+          return g > b && (f = f.slice(0, b)), d ? cb(f) : f;
         }
         e = [f];
       }
-      b -= h;
+      b -= g;
       if (!b) {
         break;
       }
@@ -1500,7 +1500,7 @@ function cb(a) {
   }
   var d = [];
   c = [];
-  for (var e = 0, g = 0, f, h, k = 0, l = void 0; k < b.length; k++) {
+  for (var e = 0, h = 0, f, g, k = 0, l = void 0; k < b.length; k++) {
     if (l = b[k]) {
       var m = void 0;
       if (l.constructor === X) {
@@ -1517,9 +1517,9 @@ function cb(a) {
         m = this.not(l.not);
       } else {
         e = l.limit || 0;
-        g = l.offset || 0;
+        h = l.offset || 0;
         f = l.enrich;
-        h = l.resolve;
+        g = l.resolve;
         continue;
       }
       d[k] = m;
@@ -1529,15 +1529,15 @@ function cb(a) {
   if (c.length) {
     return Promise.all(c).then(function() {
       a.result.length && (d = [a.result].concat(d));
-      a.result = db(d, e, g, f, h, a.K);
-      return h ? a.result : a;
+      a.result = db(d, e, h, f, g, a.K);
+      return g ? a.result : a;
     });
   }
   this.result.length && (d = [this.result].concat(d));
-  this.result = db(d, e, g, f, h, a.K);
-  return h ? this.result : this;
+  this.result = db(d, e, h, f, g, a.K);
+  return g ? this.result : this;
 };
-function db(a, b, c, d, e, g) {
+function db(a, b, c, d, e, h) {
   if (!a.length) {
     return a;
   }
@@ -1546,19 +1546,19 @@ function db(a, b, c, d, e, g) {
     return e ? W(a[0], b, c, d) : a[0];
   }
   d = [];
-  for (var f = 0, h = L(), k = ya(a), l = 0, m; l < k; l++) {
+  for (var f = 0, g = L(), k = ya(a), l = 0, m; l < k; l++) {
     for (var n = 0; n < a.length; n++) {
       if (m = a[n]) {
         if (m = m[l]) {
           for (var p = 0, q; p < m.length; p++) {
-            if (q = m[p], !h[q]) {
-              if (h[q] = 1, c) {
+            if (q = m[p], !g[q]) {
+              if (g[q] = 1, c) {
                 c--;
               } else {
                 if (e) {
                   d.push(q);
                 } else {
-                  var r = l + (n ? g : 0);
+                  var r = l + (n ? h : 0);
                   d[r] || (d[r] = []);
                   d[r].push(q);
                 }
@@ -1587,8 +1587,8 @@ function db(a, b, c, d, e, g) {
     }
     var d = [];
     c = [];
-    for (var e = 0, g = 0, f, h = 0, k = void 0; h < b.length; h++) {
-      if (k = b[h]) {
+    for (var e = 0, h = 0, f, g = 0, k = void 0; g < b.length; g++) {
+      if (k = b[g]) {
         var l = void 0;
         if (k.constructor === X) {
           l = k.result;
@@ -1604,23 +1604,23 @@ function db(a, b, c, d, e, g) {
           l = this.not(k.not);
         } else {
           e = k.limit || 0;
-          g = k.offset || 0;
+          h = k.offset || 0;
           f = k.resolve;
           continue;
         }
-        d[h] = l;
+        d[g] = l;
         l.then && c.push(l);
       }
     }
     if (c.length) {
       return Promise.all(c).then(function() {
         d = [a.result].concat(d);
-        a.result = eb(d, e, g, f, a.K);
+        a.result = eb(d, e, h, f, a.K);
         return f ? a.result : a;
       });
     }
     d = [this.result].concat(d);
-    this.result = eb(d, e, g, f, a.K);
+    this.result = eb(d, e, h, f, a.K);
     return f ? this.result : this;
   }
   return this;
@@ -1629,9 +1629,9 @@ function eb(a, b, c, d, e) {
   if (2 > a.length) {
     return [];
   }
-  var g = [], f = 0, h = L(), k = ya(a);
+  var h = [], f = 0, g = L(), k = ya(a);
   if (!k) {
-    return g;
+    return h;
   }
   for (var l = 0, m; l < a.length; l++) {
     m = a[l];
@@ -1644,16 +1644,16 @@ function eb(a, b, c, d, e) {
           if (t = y[v], !l) {
             n[t] = r + 1 + (l ? e : 0), p = 1;
           } else if (q) {
-            if (w = h[t]) {
+            if (w = g[t]) {
               if (p = 1, c) {
                 c--;
               } else {
-                if (d ? g.push(t) : (w--, r < w && (w = r), g[w] || (g[w] = []), g[w].push(t)), b && ++f === b) {
-                  return g;
+                if (d ? h.push(t) : (w--, r < w && (w = r), h[w] || (h[w] = []), h[w].push(t)), b && ++f === b) {
+                  return h;
                 }
               }
             }
-          } else if (w = h[t]) {
+          } else if (w = g[t]) {
             r + 1 < w && (w = r + 1), n[t] = w, p = 1;
           }
         }
@@ -1662,9 +1662,9 @@ function eb(a, b, c, d, e) {
     if (!p) {
       return [];
     }
-    h = n;
+    g = n;
   }
-  return g;
+  return h;
 }
 ;X.prototype.xor = function() {
   var a = this, b = arguments, c = b[0];
@@ -1678,7 +1678,7 @@ function eb(a, b, c, d, e) {
   }
   var d = [];
   c = [];
-  for (var e = 0, g = 0, f, h, k = 0, l = void 0; k < b.length; k++) {
+  for (var e = 0, h = 0, f, g, k = 0, l = void 0; k < b.length; k++) {
     if (l = b[k]) {
       var m = void 0;
       if (l.constructor === X) {
@@ -1695,9 +1695,9 @@ function eb(a, b, c, d, e) {
         m = this.not(l.not);
       } else {
         e = l.limit || 0;
-        g = l.offset || 0;
+        h = l.offset || 0;
         f = l.enrich;
-        h = l.resolve;
+        g = l.resolve;
         continue;
       }
       d[k] = m;
@@ -1707,15 +1707,15 @@ function eb(a, b, c, d, e) {
   if (c.length) {
     return Promise.all(c).then(function() {
       a.result.length && (d = [a.result].concat(d));
-      a.result = fb(d, e, g, f, !h, a.K);
-      return h ? a.result : a;
+      a.result = fb(d, e, h, f, !g, a.K);
+      return g ? a.result : a;
     });
   }
   this.result.length && (d = [this.result].concat(d));
-  this.result = fb(d, e, g, f, !h, a.K);
-  return h ? this.result : this;
+  this.result = fb(d, e, h, f, !g, a.K);
+  return g ? this.result : this;
 };
-function fb(a, b, c, d, e, g) {
+function fb(a, b, c, d, e, h) {
   if (!a.length) {
     return a;
   }
@@ -1727,8 +1727,8 @@ function fb(a, b, c, d, e, g) {
   d = 0;
   for (var f; d < a.length; d++) {
     if (f = a[d]) {
-      for (var h = 0, k; h < f.length; h++) {
-        if (k = f[h]) {
+      for (var g = 0, k; g < f.length; g++) {
+        if (k = f[g]) {
           for (var l = 0, m; l < k.length; l++) {
             m = k[l], c[m] ? c[m]++ : c[m] = 1;
           }
@@ -1738,14 +1738,14 @@ function fb(a, b, c, d, e, g) {
   }
   for (d = 0; d < a.length; d++) {
     if (f = a[d]) {
-      for (h = 0; h < f.length; h++) {
-        if (k = f[h]) {
+      for (g = 0; g < f.length; g++) {
+        if (k = f[g]) {
           for (l = 0; l < k.length; l++) {
             if (m = k[l], 1 === c[m]) {
               if (e) {
                 b.push(m);
               } else {
-                var n = h + (d ? g : 0);
+                var n = g + (d ? h : 0);
                 b[n] || (b[n] = []);
                 b[n].push(m);
               }
@@ -1769,27 +1769,27 @@ function fb(a, b, c, d, e, g) {
   }
   var d = [];
   c = [];
-  for (var e, g = 0, f = void 0; g < b.length; g++) {
-    if (f = b[g]) {
-      var h = void 0;
+  for (var e, h = 0, f = void 0; h < b.length; h++) {
+    if (f = b[h]) {
+      var g = void 0;
       if (f.constructor === X) {
-        h = f.result;
+        g = f.result;
       } else if (f.constructor === Array) {
-        h = f;
+        g = f;
       } else if (f.index) {
-        f.resolve = !1, h = f.index.search(f).result;
+        f.resolve = !1, g = f.index.search(f).result;
       } else if (f.or) {
-        h = this.or(f.or);
+        g = this.or(f.or);
       } else if (f.and) {
-        h = this.and(f.and);
+        g = this.and(f.and);
       } else if (f.xor) {
-        h = this.xor(f.xor);
+        g = this.xor(f.xor);
       } else {
         e = f.resolve;
         continue;
       }
-      d[g] = h;
-      h.then && c.push(h);
+      d[h] = g;
+      g.then && c.push(g);
     }
   }
   if (c.length) {
@@ -1809,8 +1809,8 @@ function gb(a, b) {
   a = new Set(a.flat().flat());
   for (var d = 0, e; d < this.result.length; d++) {
     if (e = this.result[d]) {
-      for (var g = 0, f; g < e.length; g++) {
-        f = e[g], a.has(f) || (b ? c.push(f) : (c[d] || (c[d] = []), c[d].push(f)));
+      for (var h = 0, f; h < e.length; h++) {
+        f = e[h], a.has(f) || (b ? c.push(f) : (c[d] || (c[d] = []), c[d].push(f)));
       }
     }
   }
@@ -1864,13 +1864,13 @@ X.prototype.resolve = function(a, b, c) {
   return d.length ? ("object" === typeof a && (c = a.enrich, b = a.offset, a = a.limit), W(d, a || 100, b, c)) : d;
 };
 function ib(a, b, c, d, e) {
-  var g = a.length, f = [], h;
+  var h = a.length, f = [], g;
   var k = L();
   for (var l = 0, m = void 0, n; l < b; l++) {
-    for (var p = 0; p < g; p++) {
+    for (var p = 0; p < h; p++) {
       if (n = a[p], l < n.length && (m = n[l])) {
         for (var q = 0; q < m.length; q++) {
-          n = m[q], (h = k[n]) ? k[n]++ : (h = 0, k[n] = 1), h = f[h] || (f[h] = []), h.push(n);
+          n = m[q], (g = k[n]) ? k[n]++ : (g = 0, k[n] = 1), g = f[g] || (f[g] = []), g.push(n);
         }
       }
     }
@@ -1879,7 +1879,7 @@ function ib(a, b, c, d, e) {
     if (e) {
       if (1 < f.length) {
         e = f;
-        g = [];
+        h = [];
         f = L();
         k = e.length;
         for (m = 0; m < k; m++) {
@@ -1888,20 +1888,20 @@ function ib(a, b, c, d, e) {
               if (f[b] = 1, d) {
                 d--;
               } else {
-                if (g.push(b), g.length === c) {
+                if (h.push(b), h.length === c) {
                   break;
                 }
               }
             }
           }
         }
-        c = g;
+        c = h;
       } else {
         c = f[0];
       }
       f = c;
     } else {
-      if (a < g) {
+      if (a < h) {
         return [];
       }
       f = f[a - 1];
@@ -1913,10 +1913,10 @@ function ib(a, b, c, d, e) {
   return f;
 }
 function jb(a, b) {
-  for (var c = L(), d = [], e = 0, g; e < b.length; e++) {
-    g = b[e];
-    for (var f = 0; f < g.length; f++) {
-      c[g[f]] = 1;
+  for (var c = L(), d = [], e = 0, h; e < b.length; e++) {
+    h = b[e];
+    for (var f = 0; f < h.length; f++) {
+      c[h[f]] = 1;
     }
   }
   for (b = 0; b < a.length; b++) {
@@ -1927,37 +1927,37 @@ function jb(a, b) {
 ;var hb = 1;
 V.prototype.search = function(a, b, c) {
   c || (!b && N(a) ? (c = a, a = "") : N(b) && (c = b, b = 0));
-  var d = [], e = 0, g;
+  var d = [], e = 0, h;
   if (c) {
     a = c.query || a;
     b = c.limit || b;
     e = c.offset || 0;
     var f = c.context;
-    var h = c.suggest;
-    (g = hb && !1 !== c.resolve) || (hb = 0);
-    var k = g && c.enrich;
+    var g = c.suggest;
+    (h = hb && !1 !== c.resolve) || (hb = 0);
+    var k = h && c.enrich;
     var l = this.db && c.tag;
   } else {
-    g = this.resolve || hb;
+    h = this.resolve || hb;
   }
   a = this.encoder.encode(a);
   var m = a.length;
-  b || !g || (b = 100);
+  b || !h || (b = 100);
   if (1 === m) {
-    return kb.call(this, a[0], "", b, e, g, k, l);
+    return kb.call(this, a[0], "", b, e, h, k, l);
   }
   f = this.depth && !1 !== f;
-  if (2 === m && f && !h) {
-    return kb.call(this, a[0], a[1], b, e, g, k, l);
+  if (2 === m && f && !g) {
+    return kb.call(this, a[0], a[1], b, e, h, k, l);
   }
   var n = c = 0;
   if (1 < m) {
     for (var p = L(), q = [], r = 0, y = void 0; r < m; r++) {
       if ((y = a[r]) && !p[y]) {
-        if (h || this.db || Y(this, y)) {
+        if (g || this.db || Y(this, y)) {
           q.push(y), p[y] = 1;
         } else {
-          return g ? d : new X(d);
+          return h ? d : new X(d);
         }
         y = y.length;
         c = Math.max(c, y);
@@ -1968,14 +1968,14 @@ V.prototype.search = function(a, b, c) {
     m = a.length;
   }
   if (!m) {
-    return g ? d : new X(d);
+    return h ? d : new X(d);
   }
   var v = 0;
   if (1 === m) {
-    return kb.call(this, a[0], "", b, e, g, k, l);
+    return kb.call(this, a[0], "", b, e, h, k, l);
   }
-  if (2 === m && f && !h) {
-    return kb.call(this, a[0], a[1], b, e, g, k, l);
+  if (2 === m && f && !g) {
+    return kb.call(this, a[0], a[1], b, e, h, k, l);
   }
   if (1 < m) {
     if (f) {
@@ -1986,7 +1986,7 @@ V.prototype.search = function(a, b, c) {
     }
   }
   if (this.db) {
-    if (this.db.search && (f = this.db.search(this, a, b, e, h, g, k, l), !1 !== f)) {
+    if (this.db.search && (f = this.db.search(this, a, b, e, g, h, k, l), !1 !== f)) {
       return f;
     }
     var w = this;
@@ -2002,19 +2002,19 @@ V.prototype.search = function(a, b, c) {
               break;
             }
             D = a[v];
-            return t ? F(E, Y(w, D, t), 8) : F(E, Y(w, D), 7);
+            return t ? F(E, Y(w, D, t, 0, 0, !1, !1), 8) : F(E, Y(w, D, "", 0, 0, !1, !1), 7);
           case 7:
-            A = E.D;
-            A = lb(A, d, h, w.resolution, b, e, 1 === m);
+            A = E.F;
+            A = lb(A, d, g, w.resolution);
             E.h = 6;
             break;
           case 8:
-            A = E.D, A = lb(A, d, h, w.ba, b, e, 2 === m), h && !1 === A && d.length || (t = D);
+            A = E.F, A = lb(A, d, g, w.aa), g && !1 === A && d.length || (t = D);
           case 6:
             if (A) {
               return E.return(A);
             }
-            if (h && v === m - 1) {
+            if (g && v === m - 1) {
               B = d.length;
               if (!B) {
                 if (t) {
@@ -2026,7 +2026,7 @@ V.prototype.search = function(a, b, c) {
                 return E.return(d);
               }
               if (1 === B) {
-                return E.return(g ? W(d[0], b, e) : new X(d[0]));
+                return E.return(h ? W(d[0], b, e) : new X(d[0]));
               }
             }
           case 3:
@@ -2034,18 +2034,18 @@ V.prototype.search = function(a, b, c) {
             E.h = 2;
             break;
           case 4:
-            return E.return(g ? ib(d, w.resolution, b, e, h) : new X(d[0]));
+            return E.return(h ? ib(d, w.resolution, b, e, g) : new X(d[0]));
         }
       });
     }();
   }
   for (k = f = void 0; v < m; v++) {
     k = a[v];
-    t ? (f = Y(this, k, t), f = lb(f, d, h, this.ba, b, e, 2 === m), h && !1 === f && d.length || (t = k)) : (f = Y(this, k), f = lb(f, d, h, this.resolution, b, e, 1 === m));
+    t ? (f = Y(this, k, t, 0, 0, !1, !1), f = lb(f, d, g, this.aa), g && !1 === f && d.length || (t = k)) : (f = Y(this, k, "", 0, 0, !1, !1), f = lb(f, d, g, this.resolution));
     if (f) {
       return f;
     }
-    if (h && v === m - 1) {
+    if (g && v === m - 1) {
       f = d.length;
       if (!f) {
         if (t) {
@@ -2056,45 +2056,38 @@ V.prototype.search = function(a, b, c) {
         return d;
       }
       if (1 === f) {
-        return g ? W(d[0], b, e) : new X(d[0]);
+        return h ? W(d[0], b, e) : new X(d[0]);
       }
     }
   }
-  d = ib(d, this.resolution, b, e, h);
-  return g ? d : new X(d);
+  d = ib(d, this.resolution, b, e, g);
+  return h ? d : new X(d);
 };
-function kb(a, b, c, d, e, g, f) {
-  a = Y(this, a, b, c, d, e, g, f);
-  return this.db ? a.then(function(h) {
-    return e ? h : h && h.length ? e ? W(h, c, d) : new X(h) : e ? [] : new X([]);
+function kb(a, b, c, d, e, h, f) {
+  a = Y(this, a, b, c, d, e, h, f);
+  return this.db ? a.then(function(g) {
+    return e ? g : g && g.length ? e ? W(g, c, d) : new X(g) : e ? [] : new X([]);
   }) : a && a.length ? e ? W(a, c, d) : new X(a) : e ? [] : new X([]);
 }
-function lb(a, b, c, d, e, g, f) {
-  var h = [];
+function lb(a, b, c, d) {
+  var e = [];
   if (a) {
     d = Math.min(a.length, d);
-    for (var k = 0, l = 0, m; k < d; k++) {
-      if (m = a[k]) {
-        if (g && m && f && (m.length <= g ? (g -= m.length, m = null) : (m = m.slice(g), g = 0)), m && (h[k] = m, f && (l += m.length, l >= e))) {
-          break;
-        }
-      }
+    for (var h = 0, f = void 0; h < d; h++) {
+      (f = a[h]) && f && (e[h] = f);
     }
-    if (h.length) {
-      if (f) {
-        return W(h, e, 0);
-      }
-      b.push(h);
+    if (e.length) {
+      b.push(e);
       return;
     }
   }
-  return !c && h;
+  return !c && e;
 }
-function Y(a, b, c, d, e, g, f, h) {
+function Y(a, b, c, d, e, h, f, g) {
   var k;
   c && (k = a.bidirectional && b > c);
   if (a.db) {
-    return c ? a.db.get(k ? c : b, k ? b : c, d, e, g, f, h) : a.db.get(b, "", d, e, g, f, h);
+    return c ? a.db.get(k ? c : b, k ? b : c, d, e, h, f, g) : a.db.get(b, "", d, e, h, f, g);
   }
   a = c ? (a = a.ctx.get(k ? b : c)) && a.get(k ? c : b) : a.map.get(b);
   return a;
@@ -2108,8 +2101,8 @@ function Y(a, b, c, d, e, g, f, h) {
           if (2 > e.length) {
             e.pop();
           } else {
-            var g = e.indexOf(a);
-            g === c.length - 1 ? e.pop() : e.splice(g, 1);
+            var h = e.indexOf(a);
+            h === c.length - 1 ? e.pop() : e.splice(h, 1);
           }
         }
       }
@@ -2118,17 +2111,17 @@ function Y(a, b, c, d, e, g, f, h) {
     }
     b || this.reg.delete(a);
   }
-  this.db && (this.commit_task.push({del:a}), this.ea && bb(this));
+  this.db && (this.commit_task.push({del:a}), this.da && bb(this));
   this.cache && this.cache.remove(a);
   return this;
 };
 function mb(a, b) {
   var c = 0;
   if (a.constructor === Array) {
-    for (var d = 0, e = void 0, g; d < a.length; d++) {
+    for (var d = 0, e = void 0, h; d < a.length; d++) {
       if ((e = a[d]) && e.length) {
-        if (g = e.indexOf(b), 0 <= g) {
-          1 < e.length ? (e.splice(g, 1), c++) : delete a[d];
+        if (h = e.indexOf(b), 0 <= h) {
+          1 < e.length ? (e.splice(h, 1), c++) : delete a[d];
           break;
         } else {
           c++;
@@ -2137,7 +2130,7 @@ function mb(a, b) {
     }
   } else {
     for (d = x(a), e = d.next(); !e.done; e = d.next()) {
-      g = e.value, e = g[0], (g = mb(g[1], b)) ? c += g : a.delete(e);
+      h = e.value, e = h[0], (h = mb(h[1], b)) ? c += h : a.delete(e);
     }
   }
   return c;
@@ -2153,7 +2146,7 @@ function mb(a, b) {
     a = {};
   }
   c = a.context || {};
-  var d = a.encode || a.encoder || Ha;
+  var d = M(a.encoder) ? Pa[a.encoder] : a.encode || a.encoder || Ha;
   this.encoder = d.encode ? d : "object" === typeof d ? new Q(d) : {encode:d};
   var e;
   this.resolution = a.resolution || 9;
@@ -2166,14 +2159,14 @@ function mb(a, b) {
   this.map = e ? new T(e) : new Map();
   this.ctx = e ? new T(e) : new Map();
   this.reg = b || (this.fastupdate ? e ? new T(e) : new Map() : e ? new U(e) : new Set());
-  this.ba = c.resolution || 1;
+  this.aa = c.resolution || 1;
   this.rtl = d.rtl || a.rtl || !1;
   this.cache = (e = a.cache || null) && new R(e);
   this.resolve = !1 !== a.resolve;
   if (e = a.db) {
-    this.db = e.mount(this);
+    this.db = this.mount(e);
   }
-  this.ea = !1 !== a.commit;
+  this.da = !1 !== a.commit;
   this.commit_task = [];
   this.commit_timer = null;
 }
@@ -2240,14 +2233,14 @@ u.cleanup = function() {
   return this;
 };
 u.searchCache = Ga;
-u.export = function(a, b, c, d, e, g) {
+u.export = function(a, b, c, d, e, h) {
   var f = !0;
-  "undefined" === typeof g && (f = new Promise(function(n) {
-    g = n;
+  "undefined" === typeof h && (f = new Promise(function(n) {
+    h = n;
   }));
   switch(e || (e = 0)) {
     case 0:
-      var h = "reg";
+      var g = "reg";
       if (this.fastupdate) {
         var k = L();
         for (var l = x(this.reg.keys()), m = l.next(); !m.done; m = l.next()) {
@@ -2258,22 +2251,22 @@ u.export = function(a, b, c, d, e, g) {
       }
       break;
     case 1:
-      h = "cfg";
+      g = "cfg";
       k = {doc:0, opt:this.h ? 1 : 0};
       break;
     case 2:
-      h = "map";
+      g = "map";
       k = this.map;
       break;
     case 3:
-      h = "ctx";
+      g = "ctx";
       k = this.ctx;
       break;
     default:
-      "undefined" === typeof c && g && g();
+      "undefined" === typeof c && h && h();
       return;
   }
-  Wa(a, b || this, c, h, d, e, k, g);
+  Wa(a, b || this, c, g, d, e, k, h);
   return f;
 };
 u.import = function(a, b) {
@@ -2305,26 +2298,26 @@ u.serialize = function(a) {
   b = "index.reg=new Set([" + b + "]);";
   d = "";
   e = x(this.map.entries());
-  for (var g = e.next(); !g.done; g = e.next()) {
-    var f = g.value;
-    g = f[0];
+  for (var h = e.next(); !h.done; h = e.next()) {
+    var f = h.value;
+    h = f[0];
     f = f[1];
-    for (var h = "", k = 0, l; k < f.length; k++) {
+    for (var g = "", k = 0, l; k < f.length; k++) {
       l = f[k] || [""];
       for (var m = "", n = 0; n < l.length; n++) {
         m += (m ? "," : "") + ("string" === c ? '"' + l[n] + '"' : l[n]);
       }
       m = "[" + m + "]";
-      h += (h ? "," : "") + m;
+      g += (g ? "," : "") + m;
     }
-    h = '["' + g + '",[' + h + "]]";
-    d += (d ? "," : "") + h;
+    g = '["' + h + '",[' + g + "]]";
+    d += (d ? "," : "") + g;
   }
   d = "index.map=new Map([" + d + "]);";
   e = "";
-  g = x(this.ctx.entries());
-  for (f = g.next(); !f.done; f = g.next()) {
-    for (h = f.value, f = h[0], h = x(h[1].entries()), k = h.next(); !k.done; k = h.next()) {
+  h = x(this.ctx.entries());
+  for (f = h.next(); !f.done; f = h.next()) {
+    for (g = f.value, f = g[0], g = x(g[1].entries()), k = g.next(); !k.done; k = g.next()) {
       l = k.value;
       k = l[0];
       l = l[1];
@@ -2348,7 +2341,7 @@ u.serialize = function(a) {
 };
 Ya(V.prototype);
 function ob(a) {
-  var b, c, d, e, g, f, h, k;
+  var b, c, d, e, h, f, g, k;
   return H(function(l) {
     a = a.data;
     b = self._index;
@@ -2357,54 +2350,51 @@ function ob(a) {
     switch(d) {
       case "init":
         e = a.options || {};
-        (g = e.config) && (e = g);
+        (h = e.config) && (e = h);
         (f = a.factory) ? (Function("return " + f)()(self), self._index = new self.FlexSearch.Index(e), delete self.FlexSearch) : self._index = new V(e);
         postMessage({id:a.id});
         break;
       default:
-        h = a.id, k = b[d].apply(b, c), postMessage("search" === d ? {id:h, msg:k} : {id:h});
+        g = a.id, k = b[d].apply(b, c), postMessage("search" === d ? {id:g, msg:k} : {id:g});
     }
     l.h = 0;
   });
 }
 ;var pb = 0;
 function qb(a) {
+  function b(h) {
+    function f(g) {
+      g = g.data || g;
+      var k = g.id, l = k && e.h[k];
+      l && (l(g.msg), delete e.h[k]);
+    }
+    this.worker = h || rb(c, d, a.worker);
+    if (this.worker.then) {
+      return this.worker.then(b);
+    }
+    this.h = L();
+    if (this.worker) {
+      d ? this.worker.on("message", f) : this.worker.onmessage = f;
+      if (a.config) {
+        return new Promise(function(g) {
+          e.h[++pb] = function() {
+            g(e);
+          };
+          e.worker.postMessage({id:pb, task:"init", factory:c, options:a});
+        });
+      }
+      this.worker.postMessage({task:"init", factory:c, options:a});
+      return this.worker;
+    }
+  }
+  a = void 0 === a ? {} : a;
   if (!this) {
     return new qb(a);
   }
-  a || (a = {});
-  var b = "undefined" !== typeof self && (self || window)._factory;
-  b && (b = b.toString());
-  var c = "undefined" === typeof window, d = this;
-  (function() {
-    function e(f) {
-      f = f.data || f;
-      var h = f.id, k = h && d.$[h];
-      k && (k(f.msg), delete d.$[h]);
-    }
-    var g = this;
-    return H(function(f) {
-      if (1 == f.h) {
-        return F(f, rb(b, c, a.worker), 2);
-      }
-      g.worker = f.D;
-      g.$ = L();
-      if (!g.worker) {
-        return f.return();
-      }
-      c ? g.worker.on("message", e) : g.worker.onmessage = e;
-      if (a.config) {
-        return delete a.db, f.return(new Promise(function(h) {
-          d.$[++pb] = function() {
-            h(d);
-          };
-          d.worker.postMessage({id:pb, task:"init", factory:b, options:a});
-        }));
-      }
-      g.worker.postMessage({task:"init", factory:b, options:a});
-      f.h = 0;
-    });
-  }).call(this);
+  var c = "undefined" !== typeof self ? self._factory : "undefined" !== typeof window ? window._factory : null;
+  c && (c = c.toString());
+  var d = "undefined" === typeof window, e = this;
+  this.worker = b.call(this);
 }
 sb("add");
 sb("append");
@@ -2413,24 +2403,22 @@ sb("update");
 sb("remove");
 function sb(a) {
   qb.prototype[a] = qb.prototype[a + "Async"] = function() {
-    var b = this, c = [].slice.call(arguments), d = c[c.length - 1];
-    if ("function" === typeof d) {
-      var e = d;
-      c.splice(c.length - 1, 1);
-    }
-    d = new Promise(function(g) {
-      b.$[++pb] = g;
-      b.worker.postMessage({task:a, id:pb, args:c});
+    var b = this, c = arguments, d, e, h, f, g;
+    return H(function(k) {
+      d = b;
+      e = [].slice.call(c);
+      h = e[e.length - 1];
+      "function" === typeof h && (f = h, e.splice(e.length - 1, 1));
+      g = new Promise(function(l) {
+        d.h[++pb] = l;
+        d.worker.postMessage({task:a, id:pb, args:e});
+      });
+      return f ? (g.then(f), k.return(b)) : k.return(g);
     });
-    return e ? (d.then(e), this) : d;
   };
 }
 function rb(a, b, c) {
-  var d;
-  return H(function(e) {
-    d = b ? "undefined" !== typeof module ? new (require("worker_threads")["Worker"])(__dirname + "/node/node.js") : new ((await import("worker_threads"))["Worker"])((1,eval)("import.meta.dirname") + "/node/node.mjs") : a ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + ob.toString()], {type:"text/javascript"}))) : new window.Worker(M(c) ? c : "worker/worker.js", {type:"module"});
-    return e.return(d);
-  });
+  return b ? "undefined" !== typeof module ? new (require("worker_threads")["Worker"])(__dirname + "/node/node.js") : import("worker_threads").then(function(worker){ return new worker["Worker"]((1,eval)("import.meta.dirname") + "/node/node.mjs"); }) : a ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + ob.toString()], {type:"text/javascript"}))) : new window.Worker(M(c) ? c : "worker/worker.js", {type:"module"});
 }
 ;Z.prototype.add = function(a, b, c) {
   N(a) && (b = a, a = xa(b, this.key));
@@ -2440,21 +2428,21 @@ function rb(a, b, c) {
     }
     for (var d = 0, e; d < this.field.length; d++) {
       e = this.M[d];
-      var g = this.index.get(this.field[d]);
+      var h = this.index.get(this.field[d]);
       if ("function" === typeof e) {
-        (e = e(b)) && g.add(a, e, !1, !0);
+        (e = e(b)) && h.add(a, e, !1, !0);
       } else {
         var f = e.R;
         if (!f || f(b)) {
-          e.constructor === String ? e = ["" + e] : M(e) && (e = [e]), tb(b, e, this.T, 0, g, a, e[0], c);
+          e.constructor === String ? e = ["" + e] : M(e) && (e = [e]), tb(b, e, this.T, 0, h, a, e[0], c);
         }
       }
     }
     if (this.tag) {
       for (d = 0; d < this.L.length; d++) {
         f = this.L[d];
-        var h = this.aa[d];
-        g = this.tag.get(h);
+        var g = this.$[d];
+        h = this.tag.get(g);
         e = L();
         if ("function" === typeof f) {
           if (f = f(b), !f) {
@@ -2468,13 +2456,13 @@ function rb(a, b, c) {
           f.constructor === String && (f = "" + f);
           f = xa(b, f);
         }
-        if (g && f) {
-          for (M(f) && (f = [f]), h = 0, k = void 0; h < f.length; h++) {
-            var l = f[h];
+        if (h && f) {
+          for (M(f) && (f = [f]), g = 0, k = void 0; g < f.length; g++) {
+            var l = f[g];
             if (!e[l]) {
               e[l] = 1;
               var m;
-              (m = g.get(l)) ? k = m : g.set(l, k = []);
+              (m = h.get(l)) ? k = m : h.set(l, k = []);
               if (!c || !k.includes(a)) {
                 if (k.length === Math.pow(2, 31) - 1) {
                   m = new S(k);
@@ -2483,7 +2471,7 @@ function rb(a, b, c) {
                       p = p.value, p.includes(k) && (p[p.indexOf(k)] = m);
                     }
                   }
-                  g.set(l, k = m);
+                  h.set(l, k = m);
                 }
                 k.push(a);
                 this.fastupdate && ((l = this.reg.get(a)) ? l.push(k) : this.reg.set(a, [k]));
@@ -2491,7 +2479,7 @@ function rb(a, b, c) {
             }
           }
         } else {
-          g || console.warn("Tag '" + h + "' was not found");
+          h || console.warn("Tag '" + g + "' was not found");
         }
       }
     }
@@ -2499,19 +2487,19 @@ function rb(a, b, c) {
       if (this.H) {
         var q = L();
         for (c = 0; c < this.H.length; c++) {
-          if (d = this.H[c], g = d.R, !g || g(b)) {
-            g = void 0;
+          if (d = this.H[c], h = d.R, !h || h(b)) {
+            h = void 0;
             if ("function" === typeof d) {
-              g = d(b);
-              if (!g) {
+              h = d(b);
+              if (!h) {
                 continue;
               }
-              d = [d.ma];
+              d = [d.la];
             } else if (M(d) || d.constructor === String) {
               q[d] = b[d];
               continue;
             }
-            ub(b, q, d, 0, d[0], g);
+            ub(b, q, d, 0, d[0], h);
           }
         }
       }
@@ -2520,10 +2508,10 @@ function rb(a, b, c) {
   }
   return this;
 };
-function ub(a, b, c, d, e, g) {
+function ub(a, b, c, d, e, h) {
   a = a[e];
   if (d === c.length - 1) {
-    b[e] = g || a;
+    b[e] = h || a;
   } else if (a) {
     if (a.constructor === Array) {
       for (b = b[e] = Array(a.length), e = 0; e < a.length; e++) {
@@ -2534,41 +2522,41 @@ function ub(a, b, c, d, e, g) {
     }
   }
 }
-function tb(a, b, c, d, e, g, f, h) {
+function tb(a, b, c, d, e, h, f, g) {
   if (a = a[f]) {
     if (d === b.length - 1) {
       if (a.constructor === Array) {
         if (c[d]) {
           for (b = 0; b < a.length; b++) {
-            e.add(g, a[b], !0, !0);
+            e.add(h, a[b], !0, !0);
           }
           return;
         }
         a = a.join(" ");
       }
-      e.add(g, a, h, !0);
+      e.add(h, a, g, !0);
     } else {
       if (a.constructor === Array) {
         for (f = 0; f < a.length; f++) {
-          tb(a, b, c, d, e, g, f, h);
+          tb(a, b, c, d, e, h, f, g);
         }
       } else {
-        f = b[++d], tb(a, b, c, d, e, g, f, h);
+        f = b[++d], tb(a, b, c, d, e, h, f, g);
       }
     }
   } else {
-    e.db && e.remove(g);
+    e.db && e.remove(h);
   }
 }
 ;Z.prototype.search = function(a, b, c, d) {
   c || (!b && N(a) ? (c = a, a = "") : N(b) && (c = b, b = 0));
-  var e = [], g = [], f = 0;
+  var e = [], h = [], f = 0;
   if (c) {
     c.constructor === Array && (c = {index:c});
     a = c.query || a;
-    var h = c.pluck;
+    var g = c.pluck;
     var k = c.merge;
-    var l = h || c.field || c.index;
+    var l = g || c.field || c.index;
     var m = this.tag && c.tag;
     var n = this.store && c.enrich;
     var p = c.suggest;
@@ -2610,24 +2598,24 @@ function tb(a, b, c, d, e, g, f, h) {
       }
       m = r;
       if (!a) {
-        g = [];
+        h = [];
         if (r.length) {
-          for (h = 0; h < r.length; h += 2) {
+          for (g = 0; g < r.length; g += 2) {
             p = void 0;
             if (this.db) {
-              p = this.index.get(r[h]);
+              p = this.index.get(r[g]);
               if (!p) {
-                console.warn("Tag '" + r[h] + ":" + r[h + 1] + "' will be skipped because there is no field '" + r[h] + "'.");
+                console.warn("Tag '" + r[g] + ":" + r[g + 1] + "' will be skipped because there is no field '" + r[g] + "'.");
                 continue;
               }
-              g.push(p = p.db.tag(r[h + 1], b, q, n));
+              h.push(p = p.db.tag(r[g + 1], b, q, n));
             } else {
-              p = vb.call(this, r[h], r[h + 1], b, q, n);
+              p = vb.call(this, r[g], r[g + 1], b, q, n);
             }
-            e.push({field:r[h], tag:r[h + 1], result:p});
+            e.push({field:r[g], tag:r[g + 1], result:p});
           }
         }
-        return g.length ? Promise.all(g).then(function(O) {
+        return h.length ? Promise.all(h).then(function(O) {
           for (var P = 0; P < O.length; P++) {
             e[P].result = O[P];
           }
@@ -2708,7 +2696,7 @@ function tb(a, b, c, d, e, g, f, h) {
         }
       }
       if (w) {
-        g[f] = v, e.push(t), f++;
+        h[f] = v, e.push(t), f++;
       } else if (1 === l.length) {
         return e;
       }
@@ -2717,15 +2705,15 @@ function tb(a, b, c, d, e, g, f, h) {
   if (r) {
     if (this.db && m && m.length && !E) {
       for (n = 0; n < m.length; n += 2) {
-        g = this.index.get(m[n]);
-        if (!g) {
+        h = this.index.get(m[n]);
+        if (!h) {
           if (console.warn("Tag '" + m[n] + ":" + m[n + 1] + "' was not found because there is no field '" + m[n] + "'."), p) {
             continue;
           } else {
             return e;
           }
         }
-        r.push(g.db.tag(m[n + 1], b, q, !1));
+        r.push(h.db.tag(m[n + 1], b, q, !1));
       }
     }
     var Ib = this;
@@ -2736,18 +2724,18 @@ function tb(a, b, c, d, e, g, f, h) {
   if (!f) {
     return e;
   }
-  if (h && (!n || !this.store)) {
+  if (g && (!n || !this.store)) {
     return e[0];
   }
   r = [];
   q = 0;
-  for (p = void 0; q < g.length; q++) {
+  for (p = void 0; q < h.length; q++) {
     p = e[q];
     n && p.length && !p[0].doc && (this.db ? r.push(p = this.index.get(this.field[0]).db.enrich(p)) : p.length && (p = wb.call(this, p)));
-    if (h) {
+    if (g) {
       return p;
     }
-    e[q] = {field:g[q], result:p};
+    e[q] = {field:h[q], result:p};
   }
   return n && this.db && r.length ? Promise.all(r).then(function(O) {
     for (var P = 0; P < O.length; P++) {
@@ -2757,17 +2745,17 @@ function tb(a, b, c, d, e, g, f, h) {
   }) : k ? xb(e, b) : e;
 };
 function xb(a, b) {
-  for (var c = [], d = L(), e = 0, g, f; e < a.length; e++) {
-    g = a[e];
-    f = g.result;
-    for (var h = 0, k, l, m; h < f.length; h++) {
-      if (l = f[h], k = l.id, m = d[k]) {
-        m.push(g.field);
+  for (var c = [], d = L(), e = 0, h, f; e < a.length; e++) {
+    h = a[e];
+    f = h.result;
+    for (var g = 0, k, l, m; g < f.length; g++) {
+      if (l = f[g], k = l.id, m = d[k]) {
+        m.push(h.field);
       } else {
         if (c.length === b) {
           return c;
         }
-        l.field = d[k] = [g.field];
+        l.field = d[k] = [h.field];
         c.push(l);
       }
     }
@@ -2775,16 +2763,16 @@ function xb(a, b) {
   return c;
 }
 function vb(a, b, c, d, e) {
-  var g = this.tag.get(a);
-  if (!g) {
+  var h = this.tag.get(a);
+  if (!h) {
     return console.warn("Tag '" + a + "' was not found"), [];
   }
-  if ((a = (g = g && g.get(b)) && g.length - d) && 0 < a) {
+  if ((a = (h = h && h.get(b)) && h.length - d) && 0 < a) {
     if (a > c || d) {
-      g = g.slice(d, d + c);
+      h = h.slice(d, d + c);
     }
-    e && (g = wb.call(this, g));
-    return g;
+    e && (h = wb.call(this, h));
+    return h;
   }
 }
 function wb(a) {
@@ -2809,51 +2797,48 @@ function wb(a) {
   this.cache = (c = a.cache || null) && new R(c);
   a.cache = !1;
   this.worker = a.worker;
-  c = new Map();
-  d = b.index || b.field || b;
-  M(d) && (d = [d]);
-  for (var e = 0, g, f = void 0; e < d.length; e++) {
-    g = d[e];
-    M(g) || (f = g, g = g.field);
-    f = N(f) ? Object.assign({}, a, f) : a;
-    if (this.worker) {
-      var h = new qb(f);
-      c.set(g, h);
-      h.worker || (this.worker = !1);
-    }
-    this.worker || c.set(g, new V(f, this.reg));
-    f.custom ? this.M[e] = f.custom : (this.M[e] = yb(g, this.T), f.filter && ("string" === typeof this.M[e] && (this.M[e] = new String(this.M[e])), this.M[e].R = f.filter));
-    this.field[e] = g;
-  }
-  if (this.H) {
-    for (d = b.store, M(d) && (d = [d]), e = 0; e < d.length; e++) {
-      g = d[e], f = g.field || g, g.custom ? (this.H[e] = g.custom, g.custom.ma = f) : (this.H[e] = yb(f, this.T), g.filter && ("string" === typeof this.H[e] && (this.H[e] = new String(this.H[e])), this.H[e].R = g.filter));
-    }
-  }
-  this.index = c;
+  this.index = zb.call(this, a, b);
   this.tag = null;
   if (c = b.tag) {
     if ("string" === typeof c && (c = [c]), c.length) {
-      for (this.tag = new Map(), this.L = [], this.aa = [], b = 0; b < c.length; b++) {
+      this.tag = new Map();
+      this.L = [];
+      this.$ = [];
+      b = 0;
+      for (var e = d = void 0; b < c.length; b++) {
         d = c[b];
         e = d.field || d;
         if (!e) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
         d.custom ? this.L[b] = d.custom : (this.L[b] = yb(e, this.T), d.filter && ("string" === typeof this.L[b] && (this.L[b] = new String(this.L[b])), this.L[b].R = d.filter));
-        this.aa[b] = e;
+        this.$[b] = e;
         this.tag.set(e, new Map());
       }
     }
   }
-  a.db && this.mount(a.db);
+  if (this.worker) {
+    a = [];
+    c = x(this.index.values());
+    for (b = c.next(); !b.done; b = c.next()) {
+      b = b.value, b.worker.then && a.push(b.worker);
+    }
+    if (a.length) {
+      var h = this;
+      return Promise.all(a).then(function() {
+        return h;
+      });
+    }
+  } else {
+    a.db && this.mount(a.db);
+  }
 }
 u = Z.prototype;
 u.mount = function(a) {
   var b = this.field;
   if (this.tag) {
-    for (var c = 0, d; c < this.aa.length; c++) {
-      d = this.aa[c];
+    for (var c = 0, d; c < this.$.length; c++) {
+      d = this.$[c];
       var e;
       this.index.set(d, e = new V({}, this.reg));
       b === this.field && (b = b.slice(0));
@@ -2864,31 +2849,31 @@ u.mount = function(a) {
   c = [];
   d = {db:a.db, type:a.type, fastupdate:a.fastupdate};
   e = 0;
-  for (var g; e < b.length; e++) {
-    d.field = g = b[e];
-    g = this.index.get(g);
+  for (var h; e < b.length; e++) {
+    d.field = h = b[e];
+    h = this.index.get(h);
     var f = new a.constructor(a.id, d);
     f.id = a.id;
-    c[e] = f.mount(g);
-    g.document = !0;
-    e ? g.bypass = !0 : g.store = this.store;
+    c[e] = f.mount(h);
+    h.document = !0;
+    e ? h.bypass = !0 : h.store = this.store;
   }
   this.db = !0;
   return Promise.all(c);
 };
 u.commit = function(a, b) {
-  var c = this, d, e, g, f;
-  return H(function(h) {
-    if (1 == h.h) {
+  var c = this, d, e, h, f;
+  return H(function(g) {
+    if (1 == g.h) {
       d = [];
       e = x(c.index.values());
-      for (g = e.next(); !g.done; g = e.next()) {
-        f = g.value, d.push(f.db.commit(f, a, b));
+      for (h = e.next(); !h.done; h = e.next()) {
+        f = h.value, d.push(f.db.commit(f, a, b));
       }
-      return F(h, Promise.all(d), 2);
+      return F(g, Promise.all(d), 2);
     }
     c.reg.clear();
-    h.h = 0;
+    g.h = 0;
   });
 };
 u.destroy = function() {
@@ -2897,6 +2882,28 @@ u.destroy = function() {
   }
   return Promise.all(a);
 };
+function zb(a, b) {
+  var c = new Map(), d = b.index || b.field || b;
+  M(d) && (d = [d]);
+  for (var e = 0, h, f = void 0; e < d.length; e++) {
+    h = d[e];
+    M(h) || (f = h, h = h.field);
+    f = N(f) ? Object.assign({}, a, f) : a;
+    if (this.worker) {
+      var g = new qb(f);
+      g.worker ? c.set(h, g) : this.worker = !1;
+    }
+    this.worker || c.set(h, new V(f, this.reg));
+    f.custom ? this.M[e] = f.custom : (this.M[e] = yb(h, this.T), f.filter && ("string" === typeof this.M[e] && (this.M[e] = new String(this.M[e])), this.M[e].R = f.filter));
+    this.field[e] = h;
+  }
+  if (this.H) {
+    for (a = b.store, M(a) && (a = [a]), b = 0; b < a.length; b++) {
+      d = a[b], e = d.field || d, d.custom ? (this.H[b] = d.custom, d.custom.la = e) : (this.H[b] = yb(e, this.T), d.filter && ("string" === typeof this.H[b] && (this.H[b] = new String(this.H[b])), this.H[b].R = d.filter));
+    }
+  }
+  return c;
+}
 function yb(a, b) {
   for (var c = a.split(":"), d = 0, e = 0; e < c.length; e++) {
     a = c[e], "]" === a[a.length - 1] && (a = a.substring(0, a.length - 2)) && (b[d] = !0), a && (c[d++] = a);
@@ -2920,11 +2927,11 @@ u.remove = function(a) {
       for (b = x(this.tag.values()), c = b.next(); !c.done; c = b.next()) {
         c = c.value;
         for (var d = x(c), e = d.next(); !e.done; e = d.next()) {
-          var g = e.value;
-          e = g[0];
-          g = g[1];
-          var f = g.indexOf(a);
-          -1 < f && (1 < g.length ? g.splice(f, 1) : c.delete(e));
+          var h = e.value;
+          e = h[0];
+          h = h[1];
+          var f = h.indexOf(a);
+          -1 < f && (1 < h.length ? h.splice(f, 1) : c.delete(e));
         }
       }
     }
@@ -2965,35 +2972,35 @@ u.set = function(a, b) {
   return this;
 };
 u.searchCache = Ga;
-u.export = function(a, b, c, d, e, g) {
+u.export = function(a, b, c, d, e, h) {
   var f;
-  "undefined" === typeof g && (f = new Promise(function(k) {
-    g = k;
+  "undefined" === typeof h && (f = new Promise(function(k) {
+    h = k;
   }));
   e || (e = 0);
   d || (d = 0);
   if (d < this.field.length) {
     c = this.field[d];
-    var h = this.index[c];
+    var g = this.index[c];
     b = this;
-    h.export(a, b, e ? c : "", d, e++, g) || (d++, b.export(a, b, c, d, 1, g));
+    g.export(a, b, e ? c : "", d, e++, h) || (d++, b.export(a, b, c, d, 1, h));
   } else {
     switch(e) {
       case 1:
         b = "tag";
-        h = this.A;
+        g = this.A;
         c = null;
         break;
       case 2:
         b = "store";
-        h = this.store;
+        g = this.store;
         c = null;
         break;
       default:
-        g();
+        h();
         return;
     }
-    Wa(a, this, c, b, d, e, h, g);
+    Wa(a, this, c, b, d, e, g, h);
   }
   return f;
 };
@@ -3020,11 +3027,11 @@ u.import = function(a, b) {
   }
 };
 Ya(Z.prototype);
-var zb = "undefined" !== typeof window && (window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB), Ab = ["map", "ctx", "tag", "reg", "cfg"];
-function Bb(a, b) {
+var Ab = "undefined" !== typeof window && (window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB), Bb = ["map", "ctx", "tag", "reg", "cfg"];
+function Cb(a, b) {
   b = void 0 === b ? {} : b;
   if (!this) {
-    return new Bb(a, b);
+    return new Cb(a, b);
   }
   "object" === typeof a && (b = a = a.name);
   a || console.info("Default storage space was used, because a name was not passed.");
@@ -3034,7 +3041,7 @@ function Bb(a, b) {
   this.db = null;
   this.h = {};
 }
-u = Bb.prototype;
+u = Cb.prototype;
 u.mount = function(a) {
   if (!a.encoder) {
     return a.mount(this);
@@ -3046,11 +3053,11 @@ u.open = function() {
   var a = this;
   navigator.storage && navigator.storage.persist();
   return this.db || new Promise(function(b, c) {
-    var d = zb.open(a.id + (a.field ? ":" + a.field : ""), 1);
+    var d = Ab.open(a.id + (a.field ? ":" + a.field : ""), 1);
     d.onupgradeneeded = function() {
       var e = a.db = this.result;
-      Ab.forEach(function(g) {
-        e.objectStoreNames.contains(g) || e.createObjectStore(g);
+      Bb.forEach(function(h) {
+        e.objectStoreNames.contains(h) || e.createObjectStore(h);
       });
     };
     d.onblocked = function(e) {
@@ -3075,32 +3082,33 @@ u.close = function() {
   this.db = null;
 };
 u.destroy = function() {
-  return zb.deleteDatabase(this.id + (this.field ? ":" + this.field : ""));
+  return Ab.deleteDatabase(this.id + (this.field ? ":" + this.field : ""));
 };
 u.clear = function() {
-  for (var a = this.db.transaction(Ab, "readwrite"), b = 0; b < Ab.length; b++) {
-    a.objectStore(Ab[b]).clear();
+  for (var a = this.db.transaction(Bb, "readwrite"), b = 0; b < Bb.length; b++) {
+    a.objectStore(Bb[b]).clear();
   }
-  return Cb(a);
+  return Db(a);
 };
-u.get = function(a, b, c, d, e, g) {
+u.get = function(a, b, c, d, e, h) {
   c = void 0 === c ? 0 : c;
   d = void 0 === d ? 0 : d;
   e = void 0 === e ? !0 : e;
-  g = void 0 === g ? !1 : g;
+  h = void 0 === h ? !1 : h;
+  console.log("!!!!!!!!!!!");
   a = this.db.transaction(b ? "ctx" : "map", "readonly").objectStore(b ? "ctx" : "map").get(b ? b + ":" + a : a);
   var f = this;
-  return Cb(a).then(function(h) {
+  return Db(a).then(function(g) {
     var k = [];
-    if (!h || !h.length) {
+    if (!g || !g.length) {
       return k;
     }
     if (e) {
-      if (!c && !d && 1 === h.length) {
-        return h[0];
+      if (!c && !d && 1 === g.length) {
+        return g[0];
       }
-      for (var l = 0, m = void 0; l < h.length; l++) {
-        if ((m = h[l]) && m.length) {
+      for (var l = 0, m = void 0; l < g.length; l++) {
+        if ((m = g[l]) && m.length) {
           if (d >= m.length) {
             d -= m.length;
           } else {
@@ -3114,9 +3122,9 @@ u.get = function(a, b, c, d, e, g) {
           }
         }
       }
-      return g ? f.enrich(k) : k;
+      return h ? f.enrich(k) : k;
     }
-    return h;
+    return g;
   });
 };
 u.tag = function(a, b, c, d) {
@@ -3125,32 +3133,32 @@ u.tag = function(a, b, c, d) {
   d = void 0 === d ? !1 : d;
   a = this.db.transaction("tag", "readonly").objectStore("tag").get(a);
   var e = this;
-  return Cb(a).then(function(g) {
-    if (!g || !g.length || c >= g.length) {
+  return Db(a).then(function(h) {
+    if (!h || !h.length || c >= h.length) {
       return [];
     }
     if (!b && !c) {
-      return g;
+      return h;
     }
-    g = g.slice(c, c + b);
-    return d ? e.enrich(g) : g;
+    h = h.slice(c, c + b);
+    return d ? e.enrich(h) : h;
   });
 };
 u.enrich = function(a) {
   "object" !== typeof a && (a = [a]);
   for (var b = this.db.transaction("reg", "readonly").objectStore("reg"), c = [], d = 0; d < a.length; d++) {
-    c[d] = Cb(b.get(a[d]));
+    c[d] = Db(b.get(a[d]));
   }
   return Promise.all(c).then(function(e) {
-    for (var g = 0; g < e.length; g++) {
-      e[g] = {id:a[g], doc:e[g] ? JSON.parse(e[g]) : null};
+    for (var h = 0; h < e.length; h++) {
+      e[h] = {id:a[h], doc:e[h] ? JSON.parse(e[h]) : null};
     }
     return e;
   });
 };
 u.has = function(a) {
   a = this.db.transaction("reg", "readonly").objectStore("reg").getKey(a);
-  return Cb(a);
+  return Db(a);
 };
 u.search = null;
 u.info = function() {
@@ -3160,73 +3168,73 @@ u.transaction = function(a, b, c) {
   if (e) {
     return c.call(this, e);
   }
-  var g = this.db.transaction(a, b);
-  this.h[a + ":" + b] = e = g.objectStore(a);
-  return new Promise(function(f, h) {
-    g.onerror = function(k) {
+  var h = this.db.transaction(a, b);
+  this.h[a + ":" + b] = e = h.objectStore(a);
+  return new Promise(function(f, g) {
+    h.onerror = function(k) {
       d.h[a + ":" + b] = null;
-      g.abort();
-      g = e = null;
-      h(k);
+      h.abort();
+      h = e = null;
+      g(k);
     };
-    g.oncomplete = function(k) {
-      g = e = d.h[a + ":" + b] = null;
+    h.oncomplete = function(k) {
+      h = e = d.h[a + ":" + b] = null;
       f(k || !0);
     };
     return c.call(d, e);
   });
 };
 u.commit = function(a, b, c) {
-  var d = this, e, g, f;
-  return H(function(h) {
-    switch(h.h) {
+  var d = this, e, h, f;
+  return H(function(g) {
+    switch(g.h) {
       case 1:
         if (b) {
-          return F(h, d.clear(), 12);
+          return F(g, d.clear(), 12);
         }
         e = a.commit_task;
         a.commit_task = [];
-        g = 0;
+        h = 0;
         f = void 0;
       case 4:
-        if (!(g < e.length)) {
-          h.h = 6;
+        if (!(h < e.length)) {
+          g.h = 6;
           break;
         }
-        f = e[g];
+        f = e[h];
         if (!f.clear) {
-          e[g] = f.pa;
-          h.h = 5;
+          e[h] = f.oa;
+          g.h = 5;
           break;
         }
-        return F(h, d.clear(), 8);
+        return F(g, d.clear(), 8);
       case 8:
         b = !0;
-        h.h = 6;
+        g.h = 6;
         break;
       case 5:
-        g++;
-        h.h = 4;
+        h++;
+        g.h = 4;
         break;
       case 6:
         if (b) {
-          h.h = 3;
+          g.h = 3;
           break;
         }
         c || (e = e.concat(wa(a.reg)));
         if (!e.length) {
-          h.h = 10;
+          g.h = 10;
           break;
         }
-        return F(h, d.remove(e), 11);
+        return F(g, d.remove(e), 11);
       case 11:
       case 10:
-        h.h = 3;
+        g.h = 3;
         break;
       case 12:
         a.commit_task = [];
       case 3:
-        return a.reg.size ? F(h, d.transaction("map", "readwrite", function(k) {
+        return a.reg.size ? F(g, d.transaction("map", "readwrite", function(k) {
           for (var l = x(a.map), m = l.next(), n = {}; !m.done; n = {O:void 0, Y:void 0}, m = l.next()) {
             m = m.value, n.Y = m[0], n.O = m[1], n.O.length && (b ? k.put(n.O, n.Y) : k.get(n.Y).onsuccess = function(p) {
               return function() {
@@ -3251,9 +3259,9 @@ u.commit = function(a, b, c) {
               };
             }(n));
           }
-        }), 13) : h.return();
+        }), 13) : g.return();
       case 13:
-        return F(h, d.transaction("ctx", "readwrite", function(k) {
+        return F(g, d.transaction("ctx", "readwrite", function(k) {
           for (var l = x(a.ctx), m = l.next(), n = {}; !m.done; n = {W:void 0}, m = l.next()) {
             m = m.value;
             n.W = m[0];
@@ -3286,7 +3294,7 @@ u.commit = function(a, b, c) {
         }), 14);
       case 14:
         if (a.store) {
-          return F(h, d.transaction("reg", "readwrite", function(k) {
+          return F(g, d.transaction("reg", "readwrite", function(k) {
             for (var l = x(a.store), m = l.next(); !m.done; m = l.next()) {
               var n = m.value;
               m = n[0];
@@ -3296,44 +3304,44 @@ u.commit = function(a, b, c) {
           }), 16);
         }
         if (a.bypass) {
-          h.h = 16;
+          g.h = 16;
           break;
         }
-        return F(h, d.transaction("reg", "readwrite", function(k) {
+        return F(g, d.transaction("reg", "readwrite", function(k) {
           for (var l = x(a.reg.keys()), m = l.next(); !m.done; m = l.next()) {
             k.put(1, m.value);
           }
         }), 16);
       case 16:
         if (!a.tag) {
-          h.h = 20;
+          g.h = 20;
           break;
         }
-        return F(h, d.transaction("tag", "readwrite", function(k) {
-          for (var l = x(a.tag), m = l.next(), n = {}; !m.done; n = {X:void 0, ca:void 0}, m = l.next()) {
-            m = m.value, n.ca = m[0], n.X = m[1], n.X.length && (k.get(n.ca).onsuccess = function(p) {
+        return F(g, d.transaction("tag", "readwrite", function(k) {
+          for (var l = x(a.tag), m = l.next(), n = {}; !m.done; n = {X:void 0, ba:void 0}, m = l.next()) {
+            m = m.value, n.ba = m[0], n.X = m[1], n.X.length && (k.get(n.ba).onsuccess = function(p) {
               return function() {
                 var q = this.result;
                 q = q && q.length ? q.concat(p.X) : p.X;
-                k.put(q, p.ca);
+                k.put(q, p.ba);
               };
             }(n));
           }
         }), 20);
       case 20:
-        a.map.clear(), a.ctx.clear(), a.tag && a.tag.clear(), a.store && a.store.clear(), a.document || a.reg.clear(), h.h = 0;
+        a.map.clear(), a.ctx.clear(), a.tag && a.tag.clear(), a.store && a.store.clear(), a.document || a.reg.clear(), g.h = 0;
     }
   });
 };
-function Db(a, b, c) {
-  for (var d = a.value, e, g, f = 0, h = 0, k; h < d.length; h++) {
-    if (k = c ? d : d[h]) {
+function Eb(a, b, c) {
+  for (var d = a.value, e, h, f = 0, g = 0, k; g < d.length; g++) {
+    if (k = c ? d : d[g]) {
       for (var l = 0, m, n; l < b.length; l++) {
-        if (n = b[l], m = k.indexOf(g ? parseInt(n, 10) : n), 0 > m && !g && "string" === typeof n && !isNaN(n) && (m = k.indexOf(parseInt(n, 10))) && (g = 1), 0 <= m) {
+        if (n = b[l], m = k.indexOf(h ? parseInt(n, 10) : n), 0 > m && !h && "string" === typeof n && !isNaN(n) && (m = k.indexOf(parseInt(n, 10))) && (h = 1), 0 <= m) {
           if (e = 1, 1 < k.length) {
             k.splice(m, 1);
           } else {
-            d[h] = [];
+            d[g] = [];
             break;
           }
         }
@@ -3352,17 +3360,17 @@ u.remove = function(a) {
   return Promise.all([this.transaction("map", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       var c = this.result;
-      c && Db(c, a);
+      c && Eb(c, a);
     };
   }), this.transaction("ctx", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       var c = this.result;
-      c && Db(c, a);
+      c && Eb(c, a);
     };
   }), this.transaction("tag", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       var c = this.result;
-      c && Db(c, a, !0);
+      c && Eb(c, a, !0);
     };
   }), this.transaction("reg", "readwrite", function(b) {
     for (var c = 0; c < a.length; c++) {
@@ -3370,7 +3378,7 @@ u.remove = function(a) {
     }
   })]);
 };
-function Cb(a) {
+function Db(a) {
   return new Promise(function(b, c) {
     a.onsuccess = function() {
       b(this.result);
@@ -3382,8 +3390,8 @@ function Cb(a) {
     a = null;
   });
 }
-;var Eb = {Index:V, Charset:Pa, Encoder:Q, Document:Z, Worker:qb, Resolver:X, IndexedDB:Bb, Language:{}}, Fb = self, Gb;
-(Gb = Fb.define) && Gb.amd ? Gb([], function() {
-  return Eb;
-}) : "object" === typeof Fb.exports ? Fb.exports = Eb : Fb.FlexSearch = Eb;
+;var Fb = {Index:V, Charset:Pa, Encoder:Q, Document:Z, Worker:qb, Resolver:X, IndexedDB:Cb, Language:{}}, Gb = self, Jb;
+(Jb = Gb.define) && Jb.amd ? Jb([], function() {
+  return Fb;
+}) : "object" === typeof Gb.exports ? Gb.exports = Fb : Gb.FlexSearch = Fb;
 }(this));
diff --git a/dist/flexsearch.es5.min.js b/dist/flexsearch.es5.min.js
index 883e3b8..2033634 100644
--- a/dist/flexsearch.es5.min.js
+++ b/dist/flexsearch.es5.min.js
@@ -7,119 +7,120 @@
  */
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-if("function"==typeof Object.setPrototypeOf)da=Object.setPrototypeOf;else{var ea;a:{var fa={a:!0},ha={};try{ha.__proto__=fa;ea=ha.a;break a}catch(a){}ea=!1}da=ea?function(a,b){a.__proto__=b;if(a.__proto__!==b)throw new TypeError(a+" is not extensible");return a}:null}var ia=da;function ja(){this.C=!1;this.A=null;this.D=void 0;this.h=1;this.J=0;this.B=null}function ka(a){if(a.C)throw new TypeError("Generator is already running");a.C=!0}ja.prototype.G=function(a){this.D=a};
-function la(a,b){a.B={na:b,oa:!0};a.h=a.J}ja.prototype.return=function(a){this.B={return:a};this.h=this.J};function F(a,b,c){a.h=c;return{value:b}}function ma(a){this.h=new ja;this.A=a}function na(a,b){ka(a.h);var c=a.h.A;if(c)return oa(a,"return"in c?c["return"]:function(d){return{value:d,done:!0}},b,a.h.return);a.h.return(b);return G(a)}
-function oa(a,b,c,d){try{var e=b.call(a.h.A,c);if(!(e instanceof Object))throw new TypeError("Iterator result "+e+" is not an object");if(!e.done)return a.h.C=!1,e;var g=e.value}catch(f){return a.h.A=null,la(a.h,f),G(a)}a.h.A=null;d.call(a.h,g);return G(a)}function G(a){for(;a.h.h;)try{var b=a.A(a.h);if(b)return a.h.C=!1,{value:b.value,done:!1}}catch(c){a.h.D=void 0,la(a.h,c)}a.h.C=!1;if(a.h.B){b=a.h.B;a.h.B=null;if(b.oa)throw b.na;return{value:b.return,done:!0}}return{value:void 0,done:!0}}
+if("function"==typeof Object.setPrototypeOf)da=Object.setPrototypeOf;else{var ea;a:{var fa={a:!0},ha={};try{ha.__proto__=fa;ea=ha.a;break a}catch(a){}ea=!1}da=ea?function(a,b){a.__proto__=b;if(a.__proto__!==b)throw new TypeError(a+" is not extensible");return a}:null}var ia=da;function ja(){this.C=!1;this.A=null;this.F=void 0;this.h=1;this.J=0;this.B=null}function ka(a){if(a.C)throw new TypeError("Generator is already running");a.C=!0}ja.prototype.G=function(a){this.F=a};
+function la(a,b){a.B={ma:b,na:!0};a.h=a.J}ja.prototype.return=function(a){this.B={return:a};this.h=this.J};function F(a,b,c){a.h=c;return{value:b}}function ma(a){this.h=new ja;this.A=a}function na(a,b){ka(a.h);var c=a.h.A;if(c)return oa(a,"return"in c?c["return"]:function(d){return{value:d,done:!0}},b,a.h.return);a.h.return(b);return G(a)}
+function oa(a,b,c,d){try{var e=b.call(a.h.A,c);if(!(e instanceof Object))throw new TypeError("Iterator result "+e+" is not an object");if(!e.done)return a.h.C=!1,e;var h=e.value}catch(f){return a.h.A=null,la(a.h,f),G(a)}a.h.A=null;d.call(a.h,h);return G(a)}function G(a){for(;a.h.h;)try{var b=a.A(a.h);if(b)return a.h.C=!1,{value:b.value,done:!1}}catch(c){a.h.F=void 0,la(a.h,c)}a.h.C=!1;if(a.h.B){b=a.h.B;a.h.B=null;if(b.na)throw b.ma;return{value:b.return,done:!0}}return{value:void 0,done:!0}}
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+function ra(a){function b(d){return a.next(d)}function c(d){return a.throw(d)}return new Promise(function(d,e){function h(f){f.done?d(f.value):Promise.resolve(f.value).then(b,c).then(h,e)}h(a.next())})}function H(a){return ra(new pa(new ma(a)))}
+B("Symbol",function(a){function b(h){if(this instanceof b)throw new TypeError("Symbol is not a constructor");return new c(d+(h||"")+"_"+e++,h)}function c(h,f){this.h=h;ba(this,"description",{configurable:!0,writable:!0,value:f})}if(a)return a;c.prototype.toString=function(){return this.h};var d="jscomp_symbol_"+(1E9*Math.random()>>>0)+"_",e=0;return b});
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-u.import=function(a,b){if(b)switch(M(b)&&(b=JSON.parse(b)),a){case "tag":this.A=b;break;case "reg":this.fastupdate=!1;this.reg=b;a=0;for(var c;a<this.field.length;a++)c=this.index[this.field[a]],c.reg=b,c.fastupdate=!1;break;case "store":this.store=b;break;default:a=a.split("."),c=a[0],a=a[1],c&&a&&this.index[c].import(a,b)}};Ya(Z.prototype);var zb="undefined"!==typeof window&&(window.indexedDB||window.mozIndexedDB||window.webkitIndexedDB||window.msIndexedDB),Ab=["map","ctx","tag","reg","cfg"];
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-u.close=function(){this.db.close();this.db=null};u.destroy=function(){return zb.deleteDatabase(this.id+(this.field?":"+this.field:""))};u.clear=function(){for(var a=this.db.transaction(Ab,"readwrite"),b=0;b<Ab.length;b++)a.objectStore(Ab[b]).clear();return Cb(a)};
-u.get=function(a,b,c,d,e,g){c=void 0===c?0:c;d=void 0===d?0:d;e=void 0===e?!0:e;g=void 0===g?!1:g;a=this.db.transaction(b?"ctx":"map","readonly").objectStore(b?"ctx":"map").get(b?b+":"+a:a);var f=this;return Cb(a).then(function(h){var k=[];if(!h||!h.length)return k;if(e){if(!c&&!d&&1===h.length)return h[0];for(var l=0,m=void 0;l<h.length;l++)if((m=h[l])&&m.length)if(d>=m.length)d-=m.length;else{for(var n=c?d+Math.min(m.length-d,c):m.length,p=d;p<n;p++)k.push(m[p]);d=0;if(k.length===c)break}return g?
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-u.enrich=function(a){"object"!==typeof a&&(a=[a]);for(var b=this.db.transaction("reg","readonly").objectStore("reg"),c=[],d=0;d<a.length;d++)c[d]=Cb(b.get(a[d]));return Promise.all(c).then(function(e){for(var g=0;g<e.length;g++)e[g]={id:a[g],doc:e[g]?JSON.parse(e[g]):null};return e})};u.has=function(a){a=this.db.transaction("reg","readonly").objectStore("reg").getKey(a);return Cb(a)};u.search=null;u.info=function(){};
-u.transaction=function(a,b,c){var d=this,e=this.h[a+":"+b];if(e)return c.call(this,e);var g=this.db.transaction(a,b);this.h[a+":"+b]=e=g.objectStore(a);return new Promise(function(f,h){g.onerror=function(k){d.h[a+":"+b]=null;g.abort();g=e=null;h(k)};g.oncomplete=function(k){g=e=d.h[a+":"+b]=null;f(k||!0)};return c.call(d,e)})};
-u.commit=function(a,b,c){var d=this,e,g,f;return H(function(h){switch(h.h){case 1:if(b)return F(h,d.clear(),12);e=a.commit_task;a.commit_task=[];g=0;f=void 0;case 4:if(!(g<e.length)){h.h=6;break}f=e[g];if(!f.clear){e[g]=f.pa;h.h=5;break}return F(h,d.clear(),8);case 8:b=!0;h.h=6;break;case 5:g++;h.h=4;break;case 6:if(b){h.h=3;break}c||(e=e.concat(wa(a.reg)));if(!e.length){h.h=10;break}return F(h,d.remove(e),11);case 11:case 10:h.h=3;break;case 12:a.commit_task=[];case 3:return a.reg.size?F(h,d.transaction("map",
-"readwrite",function(k){for(var l=x(a.map),m=l.next(),n={};!m.done;n={O:void 0,Y:void 0},m=l.next())m=m.value,n.Y=m[0],n.O=m[1],n.O.length&&(b?k.put(n.O,n.Y):k.get(n.Y).onsuccess=function(p){return function(){var q=this.result,r;if(q&&q.length)for(var y=Math.max(q.length,p.O.length),v=0,t;v<y;v++){if((t=p.O[v])&&t.length){if((r=q[v])&&r.length)for(var w=0;w<t.length;w++)r.push(t[w]);else q[v]=t;r=1}}else q=p.O,r=1;r&&k.put(q,p.Y)}}(n))}),13):h.return();case 13:return F(h,d.transaction("ctx","readwrite",
+u.export=function(a,b,c,d,e,h){var f;"undefined"===typeof h&&(f=new Promise(function(k){h=k}));e||(e=0);d||(d=0);if(d<this.field.length){c=this.field[d];var g=this.index[c];b=this;g.export(a,b,e?c:"",d,e++,h)||(d++,b.export(a,b,c,d,1,h))}else{switch(e){case 1:b="tag";g=this.A;c=null;break;case 2:b="store";g=this.store;c=null;break;default:h();return}Wa(a,this,c,b,d,e,g,h)}return f};
+u.import=function(a,b){if(b)switch(M(b)&&(b=JSON.parse(b)),a){case "tag":this.A=b;break;case "reg":this.fastupdate=!1;this.reg=b;a=0;for(var c;a<this.field.length;a++)c=this.index[this.field[a]],c.reg=b,c.fastupdate=!1;break;case "store":this.store=b;break;default:a=a.split("."),c=a[0],a=a[1],c&&a&&this.index[c].import(a,b)}};Ya(Z.prototype);var Ab="undefined"!==typeof window&&(window.indexedDB||window.mozIndexedDB||window.webkitIndexedDB||window.msIndexedDB),Bb=["map","ctx","tag","reg","cfg"];
+function Cb(a,b){b=void 0===b?{}:b;if(!this)return new Cb(a,b);"object"===typeof a&&(b=a=a.name);a||console.info("Default storage space was used, because a name was not passed.");this.id="flexsearch"+(a?":"+a.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"");this.field=b.field?b.field.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"";this.support_tag_search=!1;this.db=null;this.h={}}u=Cb.prototype;u.mount=function(a){if(!a.encoder)return a.mount(this);a.db=this;return this.open()};
+u.open=function(){var a=this;navigator.storage&&navigator.storage.persist();return this.db||new Promise(function(b,c){var d=Ab.open(a.id+(a.field?":"+a.field:""),1);d.onupgradeneeded=function(){var e=a.db=this.result;Bb.forEach(function(h){e.objectStoreNames.contains(h)||e.createObjectStore(h)})};d.onblocked=function(e){console.error("blocked",e);c()};d.onerror=function(e){console.error(this.error,e);c()};d.onsuccess=function(){a.db=this.result;a.db.onversionchange=function(){a.close()};b(a)}})};
+u.close=function(){this.db.close();this.db=null};u.destroy=function(){return Ab.deleteDatabase(this.id+(this.field?":"+this.field:""))};u.clear=function(){for(var a=this.db.transaction(Bb,"readwrite"),b=0;b<Bb.length;b++)a.objectStore(Bb[b]).clear();return Db(a)};
+u.get=function(a,b,c,d,e,h){c=void 0===c?0:c;d=void 0===d?0:d;e=void 0===e?!0:e;h=void 0===h?!1:h;console.log("!!!!!!!!!!!");a=this.db.transaction(b?"ctx":"map","readonly").objectStore(b?"ctx":"map").get(b?b+":"+a:a);var f=this;return Db(a).then(function(g){var k=[];if(!g||!g.length)return k;if(e){if(!c&&!d&&1===g.length)return g[0];for(var l=0,m=void 0;l<g.length;l++)if((m=g[l])&&m.length)if(d>=m.length)d-=m.length;else{for(var n=c?d+Math.min(m.length-d,c):m.length,p=d;p<n;p++)k.push(m[p]);d=0;if(k.length===
+c)break}return h?f.enrich(k):k}return g})};u.tag=function(a,b,c,d){b=void 0===b?0:b;c=void 0===c?0:c;d=void 0===d?!1:d;a=this.db.transaction("tag","readonly").objectStore("tag").get(a);var e=this;return Db(a).then(function(h){if(!h||!h.length||c>=h.length)return[];if(!b&&!c)return h;h=h.slice(c,c+b);return d?e.enrich(h):h})};
+u.enrich=function(a){"object"!==typeof a&&(a=[a]);for(var b=this.db.transaction("reg","readonly").objectStore("reg"),c=[],d=0;d<a.length;d++)c[d]=Db(b.get(a[d]));return Promise.all(c).then(function(e){for(var h=0;h<e.length;h++)e[h]={id:a[h],doc:e[h]?JSON.parse(e[h]):null};return e})};u.has=function(a){a=this.db.transaction("reg","readonly").objectStore("reg").getKey(a);return Db(a)};u.search=null;u.info=function(){};
+u.transaction=function(a,b,c){var d=this,e=this.h[a+":"+b];if(e)return c.call(this,e);var h=this.db.transaction(a,b);this.h[a+":"+b]=e=h.objectStore(a);return new Promise(function(f,g){h.onerror=function(k){d.h[a+":"+b]=null;h.abort();h=e=null;g(k)};h.oncomplete=function(k){h=e=d.h[a+":"+b]=null;f(k||!0)};return c.call(d,e)})};
+u.commit=function(a,b,c){var d=this,e,h,f;return H(function(g){switch(g.h){case 1:if(b)return F(g,d.clear(),12);e=a.commit_task;a.commit_task=[];h=0;f=void 0;case 4:if(!(h<e.length)){g.h=6;break}f=e[h];if(!f.clear){e[h]=f.oa;g.h=5;break}return F(g,d.clear(),8);case 8:b=!0;g.h=6;break;case 5:h++;g.h=4;break;case 6:if(b){g.h=3;break}c||(e=e.concat(wa(a.reg)));if(!e.length){g.h=10;break}return F(g,d.remove(e),11);case 11:case 10:g.h=3;break;case 12:a.commit_task=[];case 3:return a.reg.size?F(g,d.transaction("map",
+"readwrite",function(k){for(var l=x(a.map),m=l.next(),n={};!m.done;n={O:void 0,Y:void 0},m=l.next())m=m.value,n.Y=m[0],n.O=m[1],n.O.length&&(b?k.put(n.O,n.Y):k.get(n.Y).onsuccess=function(p){return function(){var q=this.result,r;if(q&&q.length)for(var y=Math.max(q.length,p.O.length),v=0,t;v<y;v++){if((t=p.O[v])&&t.length){if((r=q[v])&&r.length)for(var w=0;w<t.length;w++)r.push(t[w]);else q[v]=t;r=1}}else q=p.O,r=1;r&&k.put(q,p.Y)}}(n))}),13):g.return();case 13:return F(g,d.transaction("ctx","readwrite",
 function(k){for(var l=x(a.ctx),m=l.next(),n={};!m.done;n={W:void 0},m=l.next()){m=m.value;n.W=m[0];m=x(m[1]);for(var p=m.next(),q={};!p.done;q={P:void 0,Z:void 0},p=m.next())p=p.value,q.Z=p[0],q.P=p[1],q.P.length&&(b?k.put(q.P,n.W+":"+q.Z):k.get(n.W+":"+q.Z).onsuccess=function(r,y){return function(){var v=this.result,t;if(v&&v.length)for(var w=Math.max(v.length,r.P.length),A=0,C;A<w;A++){if((C=r.P[A])&&C.length){if((t=v[A])&&t.length)for(var D=0;D<C.length;D++)t.push(C[D]);else v[A]=C;t=1}}else v=
-r.P,t=1;t&&k.put(v,y.W+":"+r.Z)}}(q,n))}}),14);case 14:if(a.store)return F(h,d.transaction("reg","readwrite",function(k){for(var l=x(a.store),m=l.next();!m.done;m=l.next()){var n=m.value;m=n[0];n=n[1];k.put("object"===typeof n?JSON.stringify(n):1,m)}}),16);if(a.bypass){h.h=16;break}return F(h,d.transaction("reg","readwrite",function(k){for(var l=x(a.reg.keys()),m=l.next();!m.done;m=l.next())k.put(1,m.value)}),16);case 16:if(!a.tag){h.h=20;break}return F(h,d.transaction("tag","readwrite",function(k){for(var l=
-x(a.tag),m=l.next(),n={};!m.done;n={X:void 0,ca:void 0},m=l.next())m=m.value,n.ca=m[0],n.X=m[1],n.X.length&&(k.get(n.ca).onsuccess=function(p){return function(){var q=this.result;q=q&&q.length?q.concat(p.X):p.X;k.put(q,p.ca)}}(n))}),20);case 20:a.map.clear(),a.ctx.clear(),a.tag&&a.tag.clear(),a.store&&a.store.clear(),a.document||a.reg.clear(),h.h=0}})};
-function Db(a,b,c){for(var d=a.value,e,g,f=0,h=0,k;h<d.length;h++){if(k=c?d:d[h]){for(var l=0,m,n;l<b.length;l++)if(n=b[l],m=k.indexOf(g?parseInt(n,10):n),0>m&&!g&&"string"===typeof n&&!isNaN(n)&&(m=k.indexOf(parseInt(n,10)))&&(g=1),0<=m)if(e=1,1<k.length)k.splice(m,1);else{d[h]=[];break}f+=k.length}if(c)break}f?e&&a.update(d):a.delete();a.continue()}
-u.remove=function(a){"object"!==typeof a&&(a=[a]);return Promise.all([this.transaction("map","readwrite",function(b){b.openCursor().onsuccess=function(){var c=this.result;c&&Db(c,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){var c=this.result;c&&Db(c,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){var c=this.result;c&&Db(c,a,!0)}}),this.transaction("reg","readwrite",function(b){for(var c=0;c<a.length;c++)b.delete(a[c])})])};
-function Cb(a){return new Promise(function(b,c){a.onsuccess=function(){b(this.result)};a.oncomplete=function(){b(this.result)};a.onerror=c;a=null})};var Eb={Index:V,Charset:Pa,Encoder:Q,Document:Z,Worker:qb,Resolver:X,IndexedDB:Bb,Language:{}},Fb=self,Gb;(Gb=Fb.define)&&Gb.amd?Gb([],function(){return Eb}):"object"===typeof Fb.exports?Fb.exports=Eb:Fb.FlexSearch=Eb;}(this));
+r.P,t=1;t&&k.put(v,y.W+":"+r.Z)}}(q,n))}}),14);case 14:if(a.store)return F(g,d.transaction("reg","readwrite",function(k){for(var l=x(a.store),m=l.next();!m.done;m=l.next()){var n=m.value;m=n[0];n=n[1];k.put("object"===typeof n?JSON.stringify(n):1,m)}}),16);if(a.bypass){g.h=16;break}return F(g,d.transaction("reg","readwrite",function(k){for(var l=x(a.reg.keys()),m=l.next();!m.done;m=l.next())k.put(1,m.value)}),16);case 16:if(!a.tag){g.h=20;break}return F(g,d.transaction("tag","readwrite",function(k){for(var l=
+x(a.tag),m=l.next(),n={};!m.done;n={X:void 0,ba:void 0},m=l.next())m=m.value,n.ba=m[0],n.X=m[1],n.X.length&&(k.get(n.ba).onsuccess=function(p){return function(){var q=this.result;q=q&&q.length?q.concat(p.X):p.X;k.put(q,p.ba)}}(n))}),20);case 20:a.map.clear(),a.ctx.clear(),a.tag&&a.tag.clear(),a.store&&a.store.clear(),a.document||a.reg.clear(),g.h=0}})};
+function Eb(a,b,c){for(var d=a.value,e,h,f=0,g=0,k;g<d.length;g++){if(k=c?d:d[g]){for(var l=0,m,n;l<b.length;l++)if(n=b[l],m=k.indexOf(h?parseInt(n,10):n),0>m&&!h&&"string"===typeof n&&!isNaN(n)&&(m=k.indexOf(parseInt(n,10)))&&(h=1),0<=m)if(e=1,1<k.length)k.splice(m,1);else{d[g]=[];break}f+=k.length}if(c)break}f?e&&a.update(d):a.delete();a.continue()}
+u.remove=function(a){"object"!==typeof a&&(a=[a]);return Promise.all([this.transaction("map","readwrite",function(b){b.openCursor().onsuccess=function(){var c=this.result;c&&Eb(c,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){var c=this.result;c&&Eb(c,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){var c=this.result;c&&Eb(c,a,!0)}}),this.transaction("reg","readwrite",function(b){for(var c=0;c<a.length;c++)b.delete(a[c])})])};
+function Db(a){return new Promise(function(b,c){a.onsuccess=function(){b(this.result)};a.oncomplete=function(){b(this.result)};a.onerror=c;a=null})};var Fb={Index:V,Charset:Pa,Encoder:Q,Document:Z,Worker:qb,Resolver:X,IndexedDB:Cb,Language:{}},Gb=self,Jb;(Jb=Gb.define)&&Jb.amd?Jb([],function(){return Fb}):"object"===typeof Gb.exports?Gb.exports=Fb:Gb.FlexSearch=Fb;}(this));
diff --git a/dist/flexsearch.light.debug.js b/dist/flexsearch.light.debug.js
index a3e8af9..0fe61a4 100644
--- a/dist/flexsearch.light.debug.js
+++ b/dist/flexsearch.light.debug.js
@@ -162,8 +162,8 @@ C.prototype.encode = function(a) {
     f && k && (f.length < this.minlength || this.filter && this.filter.has(f)) && (f = "");
     if (f && (this.mapper || this.dedupe && 1 < f.length)) {
       e = "";
-      for (let m = 0, l = "", p, r; m < f.length; m++) {
-        p = f.charAt(m), p === l && this.dedupe || ((r = this.mapper && this.mapper.get(p)) || "" === r ? r === l && this.dedupe || !(l = r) || (e += r) : e += l = p);
+      for (let m = 0, q = "", n, r; m < f.length; m++) {
+        n = f.charAt(m), n === q && this.dedupe || ((r = this.mapper && this.mapper.get(n)) || "" === r ? r === q && this.dedupe || !(q = r) || (e += r) : e += q = n);
       }
       f = e;
     }
@@ -220,20 +220,20 @@ H.prototype.add = function(a, c, b, d) {
     }
     c = this.encoder.encode(c);
     if (d = c.length) {
-      const m = u(), l = u(), p = this.depth, r = this.resolution;
-      for (let n = 0; n < d; n++) {
-        let q = c[this.rtl ? d - 1 - n : n];
-        var e = q.length;
-        if (e && (p || !l[q])) {
-          var g = this.score ? this.score(c, q, n, null, 0) : I(r, d, n), f = "";
+      const m = u(), q = u(), n = this.depth, r = this.resolution;
+      for (let l = 0; l < d; l++) {
+        let p = c[this.rtl ? d - 1 - l : l];
+        var e = p.length;
+        if (e && (n || !q[p])) {
+          var g = this.score ? this.score(c, p, l, null, 0) : I(r, d, l), f = "";
           switch(this.tokenize) {
             case "full":
               if (2 < e) {
                 for (g = 0; g < e; g++) {
                   for (var h = e; h > g; h--) {
-                    f = q.substring(g, h);
-                    var k = this.score ? this.score(c, q, n, f, g) : I(r, d, n, e, g);
-                    J(this, l, f, k, a, b);
+                    f = p.substring(g, h);
+                    var k = this.score ? this.score(c, p, l, f, g) : I(r, d, l, e, g);
+                    J(this, q, f, k, a, b);
                   }
                 }
                 break;
@@ -241,24 +241,24 @@ H.prototype.add = function(a, c, b, d) {
             case "reverse":
               if (1 < e) {
                 for (h = e - 1; 0 < h; h--) {
-                  f = q[h] + f, k = this.score ? this.score(c, q, n, f, h) : I(r, d, n, e, h), J(this, l, f, k, a, b);
+                  f = p[h] + f, k = this.score ? this.score(c, p, l, f, h) : I(r, d, l, e, h), J(this, q, f, k, a, b);
                 }
                 f = "";
               }
             case "forward":
               if (1 < e) {
                 for (h = 0; h < e; h++) {
-                  f += q[h], J(this, l, f, g, a, b);
+                  f += p[h], J(this, q, f, g, a, b);
                 }
                 break;
               }
             default:
-              if (J(this, l, q, g, a, b), p && 1 < d && n < d - 1) {
-                for (e = u(), f = this.A, g = q, h = Math.min(p + 1, d - n), e[g] = 1, k = 1; k < h; k++) {
-                  if ((q = c[this.rtl ? d - 1 - n - k : n + k]) && !e[q]) {
-                    e[q] = 1;
-                    const A = this.score ? this.score(c, g, n, q, k) : I(f + (d / 2 > f ? 0 : 1), d, n, h - 1, k - 1), M = this.bidirectional && q > g;
-                    J(this, m, M ? g : q, A, a, b, M ? q : g);
+              if (J(this, q, p, g, a, b), n && 1 < d && l < d - 1) {
+                for (e = u(), f = this.A, g = p, h = Math.min(n + 1, d - l), e[g] = 1, k = 1; k < h; k++) {
+                  if ((p = c[this.rtl ? d - 1 - l - k : l + k]) && !e[p]) {
+                    e[p] = 1;
+                    const A = this.score ? this.score(c, g, l, p, k) : I(f + (d / 2 > f ? 0 : 1), d, l, h - 1, k - 1), L = this.bidirectional && p > g;
+                    J(this, m, L ? g : p, A, a, b, L ? p : g);
                   }
                 }
               }
@@ -321,29 +321,29 @@ function I(a, c, b, d, e) {
   b = a.length;
   c || (c = 100);
   if (1 === b) {
-    return L.call(this, a[0], "", c, e);
+    return M.call(this, a[0], "", c, e);
   }
   g = this.depth && !1 !== g;
   if (2 === b && g && !f) {
-    return L.call(this, a[0], a[1], c, e);
+    return M.call(this, a[0], a[1], c, e);
   }
   var h = 0, k = 0;
   if (1 < b) {
     var m = u();
-    const p = [];
-    for (let r = 0, n; r < b; r++) {
-      if ((n = a[r]) && !m[n]) {
-        if (f || N(this, n)) {
-          p.push(n), m[n] = 1;
+    const n = [];
+    for (let r = 0, l; r < b; r++) {
+      if ((l = a[r]) && !m[l]) {
+        if (f || N(this, l)) {
+          n.push(l), m[l] = 1;
         } else {
           return d;
         }
-        const q = n.length;
-        h = Math.max(h, q);
-        k = k ? Math.min(k, q) : q;
+        const p = l.length;
+        h = Math.max(h, p);
+        k = k ? Math.min(k, p) : p;
       }
     }
-    a = p;
+    a = n;
     b = a.length;
   }
   if (!b) {
@@ -351,30 +351,30 @@ function I(a, c, b, d, e) {
   }
   m = 0;
   if (1 === b) {
-    return L.call(this, a[0], "", c, e);
+    return M.call(this, a[0], "", c, e);
   }
   if (2 === b && g && !f) {
-    return L.call(this, a[0], a[1], c, e);
+    return M.call(this, a[0], a[1], c, e);
   }
   if (1 < b) {
     if (g) {
-      var l = a[0];
+      var q = a[0];
       m = 1;
     } else {
       9 < h && 3 < h / k && a.sort(v);
     }
   }
-  for (let p, r; m < b; m++) {
+  for (let n, r; m < b; m++) {
     r = a[m];
-    l ? (p = N(this, r, l), p = O(p, d, f, this.A, c, e, 2 === b), f && !1 === p && d.length || (l = r)) : (p = N(this, r), p = O(p, d, f, this.resolution, c, e, 1 === b));
-    if (p) {
-      return p;
+    q ? (n = N(this, r, q), n = O(n, d, f, this.A), f && !1 === n && d.length || (q = r)) : (n = N(this, r, ""), n = O(n, d, f, this.resolution));
+    if (n) {
+      return n;
     }
     if (f && m === b - 1) {
       g = d.length;
       if (!g) {
-        if (l) {
-          l = "";
+        if (q) {
+          q = "";
           m = -1;
           continue;
         }
@@ -388,14 +388,14 @@ function I(a, c, b, d, e) {
   a: {
     a = d;
     d = this.resolution;
-    l = a.length;
+    q = a.length;
     b = [];
     g = u();
-    for (let p = 0, r, n, q, A; p < d; p++) {
-      for (k = 0; k < l; k++) {
-        if (q = a[k], p < q.length && (r = q[p])) {
+    for (let n = 0, r, l, p, A; n < d; n++) {
+      for (k = 0; k < q; k++) {
+        if (p = a[k], n < p.length && (r = p[n])) {
           for (m = 0; m < r.length; m++) {
-            n = r[m], (h = g[n]) ? g[n]++ : (h = 0, g[n] = 1), A = b[h] || (b[h] = []), A.push(n);
+            l = r[m], (h = g[l]) ? g[l]++ : (h = 0, g[l] = 1), A = b[h] || (b[h] = []), A.push(l);
           }
         }
       }
@@ -408,8 +408,8 @@ function I(a, c, b, d, e) {
           d = u();
           g = f.length;
           for (k = 0; k < g; k++) {
-            for (l = f[k], h = l.length, m = 0; m < h; m++) {
-              if (b = l[m], !d[b]) {
+            for (q = f[k], h = q.length, m = 0; m < h; m++) {
+              if (b = q[m], !d[b]) {
                 if (d[b] = 1, e) {
                   e--;
                 } else {
@@ -426,7 +426,7 @@ function I(a, c, b, d, e) {
         }
         b = c;
       } else {
-        if (a < l) {
+        if (a < q) {
           d = [];
           break a;
         }
@@ -440,29 +440,22 @@ function I(a, c, b, d, e) {
   }
   return d;
 };
-function L(a, c, b, d) {
+function M(a, c, b, d) {
   return (a = N(this, a, c)) && a.length ? K(a, b, d) : [];
 }
-function O(a, c, b, d, e, g, f) {
-  let h = [];
+function O(a, c, b, d) {
+  let e = [];
   if (a) {
     d = Math.min(a.length, d);
-    for (let k = 0, m = 0, l; k < d; k++) {
-      if (l = a[k]) {
-        if (g && l && f && (l.length <= g ? (g -= l.length, l = null) : (l = l.slice(g), g = 0)), l && (h[k] = l, f && (m += l.length, m >= e))) {
-          break;
-        }
-      }
+    for (let g = 0, f; g < d; g++) {
+      (f = a[g]) && f && (e[g] = f);
     }
-    if (h.length) {
-      if (f) {
-        return K(h, e, 0);
-      }
-      c.push(h);
+    if (e.length) {
+      c.push(e);
       return;
     }
   }
-  return !b && h;
+  return !b && e;
 }
 function N(a, c, b) {
   let d;
diff --git a/dist/flexsearch.light.min.js b/dist/flexsearch.light.min.js
index 942ce72..d215917 100644
--- a/dist/flexsearch.light.min.js
+++ b/dist/flexsearch.light.min.js
@@ -11,14 +11,14 @@ C.prototype.assign=function(a){this.normalize=t(a.normalize,!0,this.normalize);l
 this.maxlength=t(a.maxlength,0,this.maxlength);if(this.cache=b=t(a.cache,!0,this.cache))this.j=null,this.v="number"===typeof b?b:2E5,this.h=new Map,this.i=new Map,this.l=this.g=128;this.m="";this.s=null;this.o="";this.u=null;if(this.matcher)for(const d of this.matcher.keys())this.m+=(this.m?"|":"")+d;if(this.stemmer)for(const d of this.stemmer.keys())this.o+=(this.o?"|":"")+d;return this};
 C.prototype.encode=function(a){if(this.cache&&a.length<=this.g)if(this.j){if(this.h.has(a))return this.h.get(a)}else this.j=setTimeout(D,0,this);this.normalize&&(a="function"===typeof this.normalize?this.normalize(a):B?a.normalize("NFKD").replace(B,"").toLowerCase():a.toLowerCase());this.prepare&&(a=this.prepare(a));this.numeric&&3<a.length&&(a=a.replace(y,"$1 $2").replace(z,"$1 $2").replace(x,"$1 "));const c=!(this.dedupe||this.mapper||this.filter||this.matcher||this.stemmer||this.replacer);let b=
 [],d=this.split||""===this.split?a.split(this.split):a;for(let g=0,f,h;g<d.length;g++){if(!(f=h=d[g]))continue;if(f.length<this.minlength)continue;if(c){b.push(f);continue}if(this.filter&&this.filter.has(f))continue;if(this.cache&&f.length<=this.l)if(this.j){var e=this.i.get(f);if(e||""===e){e&&b.push(e);continue}}else this.j=setTimeout(D,0,this);let k;this.stemmer&&2<f.length&&(this.u||(this.u=new RegExp("(?!^)("+this.o+")$")),f=f.replace(this.u,m=>this.stemmer.get(m)),k=1);this.matcher&&1<f.length&&
-(this.s||(this.s=new RegExp("("+this.m+")","g")),f=f.replace(this.s,m=>this.matcher.get(m)),k=1);f&&k&&(f.length<this.minlength||this.filter&&this.filter.has(f))&&(f="");if(f&&(this.mapper||this.dedupe&&1<f.length)){e="";for(let m=0,l="",p,r;m<f.length;m++)p=f.charAt(m),p===l&&this.dedupe||((r=this.mapper&&this.mapper.get(p))||""===r?r===l&&this.dedupe||!(l=r)||(e+=r):e+=l=p);f=e}if(f&&this.replacer)for(e=0;f&&e<this.replacer.length;e+=2)f=f.replace(this.replacer[e],this.replacer[e+1]);this.cache&&
+(this.s||(this.s=new RegExp("("+this.m+")","g")),f=f.replace(this.s,m=>this.matcher.get(m)),k=1);f&&k&&(f.length<this.minlength||this.filter&&this.filter.has(f))&&(f="");if(f&&(this.mapper||this.dedupe&&1<f.length)){e="";for(let m=0,q="",n,r;m<f.length;m++)n=f.charAt(m),n===q&&this.dedupe||((r=this.mapper&&this.mapper.get(n))||""===r?r===q&&this.dedupe||!(q=r)||(e+=r):e+=q=n);f=e}if(f&&this.replacer)for(e=0;f&&e<this.replacer.length;e+=2)f=f.replace(this.replacer[e],this.replacer[e+1]);this.cache&&
 h.length<=this.l&&(this.i.set(h,f),this.i.size>this.v&&(this.i.clear(),this.l=this.l/1.1|0));f&&b.push(f)}this.finalize&&(b=this.finalize(b)||b);this.cache&&a.length<=this.g&&(this.h.set(a,b),this.h.size>this.v&&(this.h.clear(),this.g=this.g/1.1|0));return b};function D(a){a.j=null;a.h.clear();a.i.clear()};function E(a){this.limit=a&&!0!==a?a:1E3;this.cache=new Map;this.g=""}E.prototype.set=function(a,c){this.cache.set(this.g=a,c);this.cache.size>this.limit&&this.cache.delete(this.cache.keys().next().value)};E.prototype.get=function(a){const c=this.cache.get(a);c&&this.g!==a&&(this.cache.delete(a),this.cache.set(this.g=a,c));return c};E.prototype.remove=function(a){for(const c of this.cache){const b=c[0];c[1].includes(a)&&this.cache.delete(b)}};
-E.prototype.clear=function(){this.cache.clear();this.g=""};const F={normalize:function(a){return a.toLowerCase()},dedupe:!1};const G={memory:{resolution:1},performance:{resolution:6,fastupdate:!0,context:{depth:1,resolution:3}},match:{tokenize:"forward"},score:{resolution:9,context:{depth:2,resolution:9}}};u();H.prototype.add=function(a,c,b,d){if(c&&(a||0===a)){if(!d&&!b&&this.reg.has(a))return this.update(a,c);c=this.encoder.encode(c);if(d=c.length){const m=u(),l=u(),p=this.depth,r=this.resolution;for(let n=0;n<d;n++){let q=c[this.rtl?d-1-n:n];var e=q.length;if(e&&(p||!l[q])){var g=this.score?this.score(c,q,n,null,0):I(r,d,n),f="";switch(this.tokenize){case "full":if(2<e){for(g=0;g<e;g++)for(var h=e;h>g;h--){f=q.substring(g,h);var k=this.score?this.score(c,q,n,f,g):I(r,d,n,e,g);J(this,l,f,k,a,b)}break}case "reverse":if(1<
-e){for(h=e-1;0<h;h--)f=q[h]+f,k=this.score?this.score(c,q,n,f,h):I(r,d,n,e,h),J(this,l,f,k,a,b);f=""}case "forward":if(1<e){for(h=0;h<e;h++)f+=q[h],J(this,l,f,g,a,b);break}default:if(J(this,l,q,g,a,b),p&&1<d&&n<d-1)for(e=u(),f=this.A,g=q,h=Math.min(p+1,d-n),e[g]=1,k=1;k<h;k++)if((q=c[this.rtl?d-1-n-k:n+k])&&!e[q]){e[q]=1;const A=this.score?this.score(c,g,n,q,k):I(f+(d/2>f?0:1),d,n,h-1,k-1),L=this.bidirectional&&q>g;J(this,m,L?g:q,A,a,b,L?q:g)}}}}this.fastupdate||this.reg.add(a)}}return this};
-function J(a,c,b,d,e,g,f){let h=f?a.ctx:a.map,k;c[b]&&f&&(k=c[b])[f]||(f?(c=k||(c[b]=u()),c[f]=1,(k=h.get(f))?h=k:h.set(f,h=new Map)):c[b]=1,(k=h.get(b))?h=k:h.set(b,h=[]),h=h[d]||(h[d]=[]),g&&h.includes(e)||(h.push(e),a.fastupdate&&((c=a.reg.get(e))?c.push(h):a.reg.set(e,[h]))))}function I(a,c,b,d,e){return b&&1<a?c+(d||0)<=a?b+(e||0):(a-1)/(c+(d||0))*(b+(e||0))+1|0:0};function K(a,c,b){if(1===a.length)return a=a[0],a=b||a.length>c?c?a.slice(b,b+c):a.slice(b):a;let d=[];for(let e=0,g,f;e<a.length;e++)if((g=a[e])&&(f=g.length)){if(b){if(b>=f){b-=f;continue}b<f&&(g=c?g.slice(b,b+c):g.slice(b),f=g.length,b=0)}if(d.length)f>c&&(g=g.slice(0,c),f=g.length),d.push(g);else{if(f>=c)return f>c&&(g=g.slice(0,c)),g;d=[g]}c-=f;if(!c)break}return d.length?d=1<d.length?[].concat.apply([],d):d[0]:d};H.prototype.search=function(a,c,b){b||(c||"object"!==typeof a?"object"===typeof c&&(b=c,c=0):(b=a,a=""));var d=[],e=0;if(b){a=b.query||a;c=b.limit||c;e=b.offset||0;var g=b.context;var f=b.suggest}a=this.encoder.encode(a);b=a.length;c||(c=100);if(1===b)return M.call(this,a[0],"",c,e);g=this.depth&&!1!==g;if(2===b&&g&&!f)return M.call(this,a[0],a[1],c,e);var h=0,k=0;if(1<b){var m=u();const p=[];for(let r=0,n;r<b;r++)if((n=a[r])&&!m[n]){if(f||N(this,n))p.push(n),m[n]=1;else return d;const q=n.length;
-h=Math.max(h,q);k=k?Math.min(k,q):q}a=p;b=a.length}if(!b)return d;m=0;if(1===b)return M.call(this,a[0],"",c,e);if(2===b&&g&&!f)return M.call(this,a[0],a[1],c,e);if(1<b)if(g){var l=a[0];m=1}else 9<h&&3<h/k&&a.sort(v);for(let p,r;m<b;m++){r=a[m];l?(p=N(this,r,l),p=O(p,d,f,this.A,c,e,2===b),f&&!1===p&&d.length||(l=r)):(p=N(this,r),p=O(p,d,f,this.resolution,c,e,1===b));if(p)return p;if(f&&m===b-1){g=d.length;if(!g){if(l){l="";m=-1;continue}return d}if(1===g)return K(d[0],c,e)}}a:{a=d;d=this.resolution;
-l=a.length;b=[];g=u();for(let p=0,r,n,q,A;p<d;p++)for(k=0;k<l;k++)if(q=a[k],p<q.length&&(r=q[p]))for(m=0;m<r.length;m++)n=r[m],(h=g[n])?g[n]++:(h=0,g[n]=1),A=b[h]||(b[h]=[]),A.push(n);if(a=b.length)if(f){if(1<b.length){f=b;a=[];d=u();g=f.length;for(k=0;k<g;k++)for(l=f[k],h=l.length,m=0;m<h;m++)if(b=l[m],!d[b])if(d[b]=1,e)e--;else if(a.push(b),a.length===c)break;c=a}else c=b[0];b=c}else{if(a<l){d=[];break a}b=b[a-1];if(b.length>c||e)b=b.slice(e,c+e)}d=b}return d};
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+E.prototype.clear=function(){this.cache.clear();this.g=""};const F={normalize:function(a){return a.toLowerCase()},dedupe:!1};const G={memory:{resolution:1},performance:{resolution:6,fastupdate:!0,context:{depth:1,resolution:3}},match:{tokenize:"forward"},score:{resolution:9,context:{depth:2,resolution:9}}};u();H.prototype.add=function(a,c,b,d){if(c&&(a||0===a)){if(!d&&!b&&this.reg.has(a))return this.update(a,c);c=this.encoder.encode(c);if(d=c.length){const m=u(),q=u(),n=this.depth,r=this.resolution;for(let l=0;l<d;l++){let p=c[this.rtl?d-1-l:l];var e=p.length;if(e&&(n||!q[p])){var g=this.score?this.score(c,p,l,null,0):I(r,d,l),f="";switch(this.tokenize){case "full":if(2<e){for(g=0;g<e;g++)for(var h=e;h>g;h--){f=p.substring(g,h);var k=this.score?this.score(c,p,l,f,g):I(r,d,l,e,g);J(this,q,f,k,a,b)}break}case "reverse":if(1<
+e){for(h=e-1;0<h;h--)f=p[h]+f,k=this.score?this.score(c,p,l,f,h):I(r,d,l,e,h),J(this,q,f,k,a,b);f=""}case "forward":if(1<e){for(h=0;h<e;h++)f+=p[h],J(this,q,f,g,a,b);break}default:if(J(this,q,p,g,a,b),n&&1<d&&l<d-1)for(e=u(),f=this.A,g=p,h=Math.min(n+1,d-l),e[g]=1,k=1;k<h;k++)if((p=c[this.rtl?d-1-l-k:l+k])&&!e[p]){e[p]=1;const A=this.score?this.score(c,g,l,p,k):I(f+(d/2>f?0:1),d,l,h-1,k-1),K=this.bidirectional&&p>g;J(this,m,K?g:p,A,a,b,K?p:g)}}}}this.fastupdate||this.reg.add(a)}}return this};
+function J(a,c,b,d,e,g,f){let h=f?a.ctx:a.map,k;c[b]&&f&&(k=c[b])[f]||(f?(c=k||(c[b]=u()),c[f]=1,(k=h.get(f))?h=k:h.set(f,h=new Map)):c[b]=1,(k=h.get(b))?h=k:h.set(b,h=[]),h=h[d]||(h[d]=[]),g&&h.includes(e)||(h.push(e),a.fastupdate&&((c=a.reg.get(e))?c.push(h):a.reg.set(e,[h]))))}function I(a,c,b,d,e){return b&&1<a?c+(d||0)<=a?b+(e||0):(a-1)/(c+(d||0))*(b+(e||0))+1|0:0};function L(a,c,b){if(1===a.length)return a=a[0],a=b||a.length>c?c?a.slice(b,b+c):a.slice(b):a;let d=[];for(let e=0,g,f;e<a.length;e++)if((g=a[e])&&(f=g.length)){if(b){if(b>=f){b-=f;continue}b<f&&(g=c?g.slice(b,b+c):g.slice(b),f=g.length,b=0)}if(d.length)f>c&&(g=g.slice(0,c),f=g.length),d.push(g);else{if(f>=c)return f>c&&(g=g.slice(0,c)),g;d=[g]}c-=f;if(!c)break}return d.length?d=1<d.length?[].concat.apply([],d):d[0]:d};H.prototype.search=function(a,c,b){b||(c||"object"!==typeof a?"object"===typeof c&&(b=c,c=0):(b=a,a=""));var d=[],e=0;if(b){a=b.query||a;c=b.limit||c;e=b.offset||0;var g=b.context;var f=b.suggest}a=this.encoder.encode(a);b=a.length;c||(c=100);if(1===b)return M.call(this,a[0],"",c,e);g=this.depth&&!1!==g;if(2===b&&g&&!f)return M.call(this,a[0],a[1],c,e);var h=0,k=0;if(1<b){var m=u();const n=[];for(let r=0,l;r<b;r++)if((l=a[r])&&!m[l]){if(f||N(this,l))n.push(l),m[l]=1;else return d;const p=l.length;
+h=Math.max(h,p);k=k?Math.min(k,p):p}a=n;b=a.length}if(!b)return d;m=0;if(1===b)return M.call(this,a[0],"",c,e);if(2===b&&g&&!f)return M.call(this,a[0],a[1],c,e);if(1<b)if(g){var q=a[0];m=1}else 9<h&&3<h/k&&a.sort(v);for(let n,r;m<b;m++){r=a[m];q?(n=N(this,r,q),n=O(n,d,f,this.A),f&&!1===n&&d.length||(q=r)):(n=N(this,r,""),n=O(n,d,f,this.resolution));if(n)return n;if(f&&m===b-1){g=d.length;if(!g){if(q){q="";m=-1;continue}return d}if(1===g)return L(d[0],c,e)}}a:{a=d;d=this.resolution;q=a.length;b=[];
+g=u();for(let n=0,r,l,p,A;n<d;n++)for(k=0;k<q;k++)if(p=a[k],n<p.length&&(r=p[n]))for(m=0;m<r.length;m++)l=r[m],(h=g[l])?g[l]++:(h=0,g[l]=1),A=b[h]||(b[h]=[]),A.push(l);if(a=b.length)if(f){if(1<b.length){f=b;a=[];d=u();g=f.length;for(k=0;k<g;k++)for(q=f[k],h=q.length,m=0;m<h;m++)if(b=q[m],!d[b])if(d[b]=1,e)e--;else if(a.push(b),a.length===c)break;c=a}else c=b[0];b=c}else{if(a<q){d=[];break a}b=b[a-1];if(b.length>c||e)b=b.slice(e,c+e)}d=b}return d};
+function M(a,c,b,d){return(a=N(this,a,c))&&a.length?L(a,b,d):[]}function O(a,c,b,d){let e=[];if(a){d=Math.min(a.length,d);for(let g=0,f;g<d;g++)(f=a[g])&&f&&(e[g]=f);if(e.length){c.push(e);return}}return!b&&e}function N(a,c,b){let d;b&&(d=a.bidirectional&&c>b);a=b?(a=a.ctx.get(d?c:b))&&a.get(d?b:c):a.map.get(c);return a};H.prototype.remove=function(a,c){const b=this.reg.size&&(this.fastupdate?this.reg.get(a):this.reg.has(a));if(b){if(this.fastupdate)for(let d=0,e;d<b.length;d++){if(e=b[d])if(2>e.length)e.pop();else{const g=e.indexOf(a);g===b.length-1?e.pop():e.splice(g,1)}}else P(this.map,a),this.depth&&P(this.ctx,a);c||this.reg.delete(a)}this.cache&&this.cache.remove(a);return this};
 function P(a,c){let b=0;if(a.constructor===Array)for(let d=0,e,g;d<a.length;d++){if((e=a[d])&&e.length)if(g=e.indexOf(c),0<=g){1<e.length?(e.splice(g,1),b++):delete a[d];break}else b++}else for(let d of a){const e=d[0],g=P(d[1],c);g?b+=g:a.delete(e)}return b};function H(a,c){if(!this)return new H(a);if(a){var b="string"===typeof a?a:a.preset;b&&(a=Object.assign({},G[b],a))}else a={};b=a.context||{};const d=a.encode||a.encoder||F;this.encoder=d.encode?d:"object"===typeof d?new C(d):{encode:d};let e;this.resolution=a.resolution||9;this.tokenize=e=a.tokenize||"strict";this.depth="strict"===e&&b.depth||0;this.bidirectional=!1!==b.bidirectional;this.fastupdate=!!a.fastupdate;this.score=a.score||null;e=!1;this.map=new Map;this.ctx=new Map;this.reg=c||(this.fastupdate?
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 function Q(a){let c=0;if(a.constructor===Array)for(let b=0,d;b<a.length;b++)(d=a[b])&&(c+=d.length);else for(const b of a){const d=b[0],e=Q(b[1]);e?c+=e:a.delete(d)}return c}H.prototype.cleanup=function(){if(!this.fastupdate)return this;Q(this.map);this.depth&&Q(this.ctx);return this};
diff --git a/dist/flexsearch.light.module.debug.js b/dist/flexsearch.light.module.debug.js
index 3083ec4..9d03004 100644
--- a/dist/flexsearch.light.module.debug.js
+++ b/dist/flexsearch.light.module.debug.js
@@ -72,20 +72,20 @@ H.prototype.add = function(a, c, b, d) {
     }
     c = this.encoder.encode(c);
     if (d = c.length) {
-      const p = t(), m = t(), q = this.depth, r = this.resolution;
+      const p = t(), q = t(), n = this.depth, r = this.resolution;
       for (let l = 0; l < d; l++) {
-        let n = c[this.rtl ? d - 1 - l : l];
-        var e = n.length;
-        if (e && (q || !m[n])) {
-          var f = this.score ? this.score(c, n, l, null, 0) : I(r, d, l), g = "";
+        let m = c[this.rtl ? d - 1 - l : l];
+        var e = m.length;
+        if (e && (n || !q[m])) {
+          var f = this.score ? this.score(c, m, l, null, 0) : I(r, d, l), g = "";
           switch(this.tokenize) {
             case "full":
               if (2 < e) {
                 for (f = 0; f < e; f++) {
                   for (var h = e; h > f; h--) {
-                    g = n.substring(f, h);
-                    var k = this.score ? this.score(c, n, l, g, f) : I(r, d, l, e, f);
-                    K(this, m, g, k, a, b);
+                    g = m.substring(f, h);
+                    var k = this.score ? this.score(c, m, l, g, f) : I(r, d, l, e, f);
+                    K(this, q, g, k, a, b);
                   }
                 }
                 break;
@@ -93,24 +93,24 @@ H.prototype.add = function(a, c, b, d) {
             case "reverse":
               if (1 < e) {
                 for (h = e - 1; 0 < h; h--) {
-                  g = n[h] + g, k = this.score ? this.score(c, n, l, g, h) : I(r, d, l, e, h), K(this, m, g, k, a, b);
+                  g = m[h] + g, k = this.score ? this.score(c, m, l, g, h) : I(r, d, l, e, h), K(this, q, g, k, a, b);
                 }
                 g = "";
               }
             case "forward":
               if (1 < e) {
                 for (h = 0; h < e; h++) {
-                  g += n[h], K(this, m, g, f, a, b);
+                  g += m[h], K(this, q, g, f, a, b);
                 }
                 break;
               }
             default:
-              if (K(this, m, n, f, a, b), q && 1 < d && l < d - 1) {
-                for (e = t(), g = this.A, f = n, h = Math.min(q + 1, d - l), e[f] = 1, k = 1; k < h; k++) {
-                  if ((n = c[this.rtl ? d - 1 - l - k : l + k]) && !e[n]) {
-                    e[n] = 1;
-                    const y = this.score ? this.score(c, f, l, n, k) : I(g + (d / 2 > g ? 0 : 1), d, l, h - 1, k - 1), J = this.bidirectional && n > f;
-                    K(this, p, J ? f : n, y, a, b, J ? n : f);
+              if (K(this, q, m, f, a, b), n && 1 < d && l < d - 1) {
+                for (e = t(), g = this.A, f = m, h = Math.min(n + 1, d - l), e[f] = 1, k = 1; k < h; k++) {
+                  if ((m = c[this.rtl ? d - 1 - l - k : l + k]) && !e[m]) {
+                    e[m] = 1;
+                    const y = this.score ? this.score(c, f, l, m, k) : I(g + (d / 2 > g ? 0 : 1), d, l, h - 1, k - 1), J = this.bidirectional && m > f;
+                    K(this, p, J ? f : m, y, a, b, J ? m : f);
                   }
                 }
               }
@@ -167,7 +167,7 @@ function I(a, c, b, d, e) {
     c = b.limit || c;
     e = b.offset || 0;
     var f = b.context;
-    var g = !1;
+    var g = b.suggest;
   }
   a = this.encoder.encode(a);
   b = a.length;
@@ -182,20 +182,20 @@ function I(a, c, b, d, e) {
   var h = 0, k = 0;
   if (1 < b) {
     var p = t();
-    const q = [];
+    const n = [];
     for (let r = 0, l; r < b; r++) {
       if ((l = a[r]) && !p[l]) {
         if (g || N(this, l)) {
-          q.push(l), p[l] = 1;
+          n.push(l), p[l] = 1;
         } else {
           return d;
         }
-        const n = l.length;
-        h = Math.max(h, n);
-        k = k ? Math.min(k, n) : n;
+        const m = l.length;
+        h = Math.max(h, m);
+        k = k ? Math.min(k, m) : m;
       }
     }
-    a = q;
+    a = n;
     b = a.length;
   }
   if (!b) {
@@ -210,23 +210,23 @@ function I(a, c, b, d, e) {
   }
   if (1 < b) {
     if (f) {
-      var m = a[0];
+      var q = a[0];
       p = 1;
     } else {
       9 < h && 3 < h / k && a.sort(u);
     }
   }
-  for (let q, r; p < b; p++) {
+  for (let n, r; p < b; p++) {
     r = a[p];
-    m ? (q = N(this, r, m), q = O(q, d, g, this.A, c, e, 2 === b), g && !1 === q && d.length || (m = r)) : (q = N(this, r), q = O(q, d, g, this.resolution, c, e, 1 === b));
-    if (q) {
-      return q;
+    q ? (n = N(this, r, q), n = O(n, d, g, this.A), g && !1 === n && d.length || (q = r)) : (n = N(this, r, ""), n = O(n, d, g, this.resolution));
+    if (n) {
+      return n;
     }
     if (g && p === b - 1) {
       f = d.length;
       if (!f) {
-        if (m) {
-          m = "";
+        if (q) {
+          q = "";
           p = -1;
           continue;
         }
@@ -240,12 +240,12 @@ function I(a, c, b, d, e) {
   a: {
     a = d;
     d = this.resolution;
-    m = a.length;
+    q = a.length;
     b = [];
     f = t();
-    for (let q = 0, r, l, n, y; q < d; q++) {
-      for (k = 0; k < m; k++) {
-        if (n = a[k], q < n.length && (r = n[q])) {
+    for (let n = 0, r, l, m, y; n < d; n++) {
+      for (k = 0; k < q; k++) {
+        if (m = a[k], n < m.length && (r = m[n])) {
           for (p = 0; p < r.length; p++) {
             l = r[p], (h = f[l]) ? f[l]++ : (h = 0, f[l] = 1), y = b[h] || (b[h] = []), y.push(l);
           }
@@ -260,8 +260,8 @@ function I(a, c, b, d, e) {
           d = t();
           f = g.length;
           for (k = 0; k < f; k++) {
-            for (m = g[k], h = m.length, p = 0; p < h; p++) {
-              if (b = m[p], !d[b]) {
+            for (q = g[k], h = q.length, p = 0; p < h; p++) {
+              if (b = q[p], !d[b]) {
                 if (d[b] = 1, e) {
                   e--;
                 } else {
@@ -278,7 +278,7 @@ function I(a, c, b, d, e) {
         }
         b = c;
       } else {
-        if (a < m) {
+        if (a < q) {
           d = [];
           break a;
         }
@@ -295,26 +295,19 @@ function I(a, c, b, d, e) {
 function M(a, c, b, d) {
   return (a = N(this, a, c)) && a.length ? L(a, b, d) : [];
 }
-function O(a, c, b, d, e, f, g) {
-  let h = [];
+function O(a, c, b, d) {
+  let e = [];
   if (a) {
     d = Math.min(a.length, d);
-    for (let k = 0, p = 0, m; k < d; k++) {
-      if (m = a[k]) {
-        if (f && m && g && (m.length <= f ? (f -= m.length, m = null) : (m = m.slice(f), f = 0)), m && (h[k] = m, g && (p += m.length, p >= e))) {
-          break;
-        }
-      }
+    for (let f = 0, g; f < d; f++) {
+      (g = a[f]) && g && (e[f] = g);
     }
-    if (h.length) {
-      if (g) {
-        return L(h, e, 0);
-      }
-      c.push(h);
+    if (e.length) {
+      c.push(e);
       return;
     }
   }
-  return !b && h;
+  return !b && e;
 }
 function N(a, c, b) {
   let d;
@@ -370,7 +363,7 @@ function P(a, c) {
     return new H(a);
   }
   a = a ? G(a) : {};
-  const b = a.context || {}, d = a.encode || a.encoder || function(f) {
+  const b = a.context || {}, d = "string" === typeof a.encoder ? E[a.encoder] : a.encode || a.encoder || function(f) {
     return f.toLowerCase().trim().split(/\s+/);
   };
   this.encoder = d.encode ? d : "object" === typeof d ? d : {encode:d};
diff --git a/dist/flexsearch.light.module.min.js b/dist/flexsearch.light.module.min.js
index a81dbde..176432f 100644
--- a/dist/flexsearch.light.module.min.js
+++ b/dist/flexsearch.light.module.min.js
@@ -7,14 +7,14 @@
  */
 function t(){return Object.create(null)}function u(a,c){return c.length-a.length};function v(a){this.limit=a&&!0!==a?a:1E3;this.cache=new Map;this.h=""}v.prototype.set=function(a,c){this.cache.set(this.h=a,c);this.cache.size>this.limit&&this.cache.delete(this.cache.keys().next().value)};v.prototype.get=function(a){const c=this.cache.get(a);c&&this.h!==a&&(this.cache.delete(a),this.cache.set(this.h=a,c));return c};v.prototype.remove=function(a){for(const c of this.cache){const b=c[0];c[1].includes(a)&&this.cache.delete(b)}};
 v.prototype.clear=function(){this.cache.clear();this.h=""};const w=new Map([["b","p"],["v","f"],["w","f"],["z","s"],["x","s"],["d","t"],["n","m"],["c","k"],["g","k"],["j","k"],["q","k"],["i","e"],["y","e"],["u","o"]]);const x=new Map([["ai","ei"],["ae","a"],["oe","o"],["ue","u"],["sh","s"],["ch","c"],["th","t"],["ph","f"],["pf","f"]]),z=[/([^aeo])h([aeo$])/g,"$1$2",/([aeo])h([^aeo]|$)/g,"$1$2"];const A={a:"",e:"",i:"",o:"",u:"",y:"",b:1,f:1,p:1,v:1,c:2,g:2,j:2,k:2,q:2,s:2,x:2,z:2,"\u00df":2,d:3,t:3,l:4,m:5,n:5,r:6};const B=/[\x00-\x7F]+/g;const C=/[\x00-\x7F]+/g;const D=/[\x00-\x7F]+/g;var E={LatinExact:{normalize:!1,dedupe:!1},LatinDefault:{normalize:function(a){return a.toLowerCase()},dedupe:!1},LatinSimple:{normalize:!0,dedupe:!0},LatinBalance:{normalize:!0,dedupe:!0,mapper:w},LatinAdvanced:{normalize:!0,dedupe:!0,mapper:w,replacer:z,matcher:x},LatinExtra:{normalize:!0,dedupe:!0,mapper:w,replacer:z.concat([/(?!^)[aeoy]/g,""]),matcher:x},LatinSoundex:{normalize:!0,dedupe:!1,include:{letter:!0},finalize:function(a){for(let b=0;b<a.length;b++){var c=a[b];let d=c.charAt(0),e=A[d];
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-e){for(h=e-1;0<h;h--)g=n[h]+g,k=this.score?this.score(c,n,l,g,h):J(r,d,l,e,h),K(this,m,g,k,a,b);g=""}case "forward":if(1<e){for(h=0;h<e;h++)g+=n[h],K(this,m,g,f,a,b);break}default:if(K(this,m,n,f,a,b),q&&1<d&&l<d-1)for(e=t(),g=this.A,f=n,h=Math.min(q+1,d-l),e[f]=1,k=1;k<h;k++)if((n=c[this.rtl?d-1-l-k:l+k])&&!e[n]){e[n]=1;const y=this.score?this.score(c,f,l,n,k):J(g+(d/2>g?0:1),d,l,h-1,k-1),I=this.bidirectional&&n>f;K(this,p,I?f:n,y,a,b,I?n:f)}}}}this.fastupdate||this.reg.add(a)}}return this};
-function K(a,c,b,d,e,f,g){let h=g?a.ctx:a.map,k;c[b]&&g&&(k=c[b])[g]||(g?(c=k||(c[b]=t()),c[g]=1,(k=h.get(g))?h=k:h.set(g,h=new Map)):c[b]=1,(k=h.get(b))?h=k:h.set(b,h=[]),h=h[d]||(h[d]=[]),f&&h.includes(e)||(h.push(e),a.fastupdate&&((c=a.reg.get(e))?c.push(h):a.reg.set(e,[h]))))}function J(a,c,b,d,e){return b&&1<a?c+(d||0)<=a?b+(e||0):(a-1)/(c+(d||0))*(b+(e||0))+1|0:0};function L(a,c,b){if(1===a.length)return a=a[0],a=b||a.length>c?c?a.slice(b,b+c):a.slice(b):a;let d=[];for(let e=0,f,g;e<a.length;e++)if((f=a[e])&&(g=f.length)){if(b){if(b>=g){b-=g;continue}b<g&&(f=c?f.slice(b,b+c):f.slice(b),g=f.length,b=0)}if(d.length)g>c&&(f=f.slice(0,c),g=f.length),d.push(f);else{if(g>=c)return g>c&&(f=f.slice(0,c)),f;d=[f]}c-=g;if(!c)break}return d.length?d=1<d.length?[].concat.apply([],d):d[0]:d};H.prototype.search=function(a,c,b){b||(c||"object"!==typeof a?"object"===typeof c&&(b=c,c=0):(b=a,a=""));var d=[],e=0;if(b){a=b.query||a;c=b.limit||c;e=b.offset||0;var f=b.context;var g=!1}a=this.encoder.encode(a);b=a.length;c||(c=100);if(1===b)return M.call(this,a[0],"",c,e);f=this.depth&&!1!==f;if(2===b&&f&&!g)return M.call(this,a[0],a[1],c,e);var h=0,k=0;if(1<b){var p=t();const q=[];for(let r=0,l;r<b;r++)if((l=a[r])&&!p[l]){if(g||N(this,l))q.push(l),p[l]=1;else return d;const n=l.length;h=Math.max(h,
-n);k=k?Math.min(k,n):n}a=q;b=a.length}if(!b)return d;p=0;if(1===b)return M.call(this,a[0],"",c,e);if(2===b&&f&&!g)return M.call(this,a[0],a[1],c,e);if(1<b)if(f){var m=a[0];p=1}else 9<h&&3<h/k&&a.sort(u);for(let q,r;p<b;p++){r=a[p];m?(q=N(this,r,m),q=O(q,d,g,this.A,c,e,2===b),g&&!1===q&&d.length||(m=r)):(q=N(this,r),q=O(q,d,g,this.resolution,c,e,1===b));if(q)return q;if(g&&p===b-1){f=d.length;if(!f){if(m){m="";p=-1;continue}return d}if(1===f)return L(d[0],c,e)}}a:{a=d;d=this.resolution;m=a.length;
-b=[];f=t();for(let q=0,r,l,n,y;q<d;q++)for(k=0;k<m;k++)if(n=a[k],q<n.length&&(r=n[q]))for(p=0;p<r.length;p++)l=r[p],(h=f[l])?f[l]++:(h=0,f[l]=1),y=b[h]||(b[h]=[]),y.push(l);if(a=b.length)if(g){if(1<b.length){g=b;a=[];d=t();f=g.length;for(k=0;k<f;k++)for(m=g[k],h=m.length,p=0;p<h;p++)if(b=m[p],!d[b])if(d[b]=1,e)e--;else if(a.push(b),a.length===c)break;c=a}else c=b[0];b=c}else{if(a<m){d=[];break a}b=b[a-1];if(b.length>c||e)b=b.slice(e,c+e)}d=b}return d};
-function M(a,c,b,d){return(a=N(this,a,c))&&a.length?L(a,b,d):[]}function O(a,c,b,d,e,f,g){let h=[];if(a){d=Math.min(a.length,d);for(let k=0,p=0,m;k<d;k++)if(m=a[k])if(f&&m&&g&&(m.length<=f?(f-=m.length,m=null):(m=m.slice(f),f=0)),m&&(h[k]=m,g&&(p+=m.length,p>=e)))break;if(h.length){if(g)return L(h,e,0);c.push(h);return}}return!b&&h}function N(a,c,b){let d;b&&(d=a.bidirectional&&c>b);a=b?(a=a.ctx.get(d?c:b))&&a.get(d?b:c):a.map.get(c);return a};H.prototype.remove=function(a,c){const b=this.reg.size&&(this.fastupdate?this.reg.get(a):this.reg.has(a));if(b){if(this.fastupdate)for(let d=0,e;d<b.length;d++){if(e=b[d])if(2>e.length)e.pop();else{const f=e.indexOf(a);f===b.length-1?e.pop():e.splice(f,1)}}else P(this.map,a),this.depth&&P(this.ctx,a);c||this.reg.delete(a)}this.cache&&this.cache.remove(a);return this};
-function P(a,c){let b=0;if(a.constructor===Array)for(let d=0,e,f;d<a.length;d++){if((e=a[d])&&e.length)if(f=e.indexOf(c),0<=f){1<e.length?(e.splice(f,1),b++):delete a[d];break}else b++}else for(let d of a){const e=d[0],f=P(d[1],c);f?b+=f:a.delete(e)}return b};function H(a,c){if(!this)return new H(a);a=a?G(a):{};const b=a.context||{},d=a.encode||a.encoder||function(f){return f.toLowerCase().trim().split(/\s+/)};this.encoder=d.encode?d:"object"===typeof d?d:{encode:d};let e;this.resolution=a.resolution||9;this.tokenize=e=a.tokenize||"strict";this.depth="strict"===e&&b.depth||0;this.bidirectional=!1!==b.bidirectional;this.fastupdate=!!a.fastupdate;this.score=a.score||null;e=!1;this.map=new Map;this.ctx=new Map;this.reg=c||(this.fastupdate?new Map:new Set);
-this.A=b.resolution||1;this.rtl=d.rtl||a.rtl||!1;this.cache=(e=a.cache||null)&&new v(e)}H.prototype.clear=function(){this.map.clear();this.ctx.clear();this.reg.clear();this.cache&&this.cache.clear();return this};H.prototype.append=function(a,c){return this.add(a,c,!0)};H.prototype.contain=function(a){return this.reg.has(a)};H.prototype.update=function(a,c){const b=this,d=this.remove(a);return d&&d.then?d.then(()=>b.add(a,c)):this.add(a,c)};
+for(let f=1,g;f<c.length&&(g=c.charAt(f),"h"===g||"w"===g||!(g=A[g])||g===e||(d+=g,e=g,4!==d.length));f++);a[b]=d}}},ArabicDefault:{rtl:!0,normalize:!1,dedupe:!0,prepare:function(a){return(""+a).replace(B," ")}},CjkDefault:{normalize:!1,dedupe:!0,split:"",prepare:function(a){return(""+a).replace(C,"")}},CyrillicDefault:{normalize:!1,dedupe:!0,prepare:function(a){return(""+a).replace(D," ")}}};const F={memory:{resolution:1},performance:{resolution:6,fastupdate:!0,context:{depth:1,resolution:3}},match:{tokenize:"forward"},score:{resolution:9,context:{depth:2,resolution:9}}};function G(a){const c="string"===typeof a?a:a.preset;c&&(a=Object.assign({},F[c],a));return a};t();H.prototype.add=function(a,c,b,d){if(c&&(a||0===a)){if(!d&&!b&&this.reg.has(a))return this.update(a,c);c=this.encoder.encode(c);if(d=c.length){const p=t(),q=t(),n=this.depth,r=this.resolution;for(let l=0;l<d;l++){let m=c[this.rtl?d-1-l:l];var e=m.length;if(e&&(n||!q[m])){var f=this.score?this.score(c,m,l,null,0):J(r,d,l),g="";switch(this.tokenize){case "full":if(2<e){for(f=0;f<e;f++)for(var h=e;h>f;h--){g=m.substring(f,h);var k=this.score?this.score(c,m,l,g,f):J(r,d,l,e,f);K(this,q,g,k,a,b)}break}case "reverse":if(1<
+e){for(h=e-1;0<h;h--)g=m[h]+g,k=this.score?this.score(c,m,l,g,h):J(r,d,l,e,h),K(this,q,g,k,a,b);g=""}case "forward":if(1<e){for(h=0;h<e;h++)g+=m[h],K(this,q,g,f,a,b);break}default:if(K(this,q,m,f,a,b),n&&1<d&&l<d-1)for(e=t(),g=this.A,f=m,h=Math.min(n+1,d-l),e[f]=1,k=1;k<h;k++)if((m=c[this.rtl?d-1-l-k:l+k])&&!e[m]){e[m]=1;const y=this.score?this.score(c,f,l,m,k):J(g+(d/2>g?0:1),d,l,h-1,k-1),I=this.bidirectional&&m>f;K(this,p,I?f:m,y,a,b,I?m:f)}}}}this.fastupdate||this.reg.add(a)}}return this};
+function K(a,c,b,d,e,f,g){let h=g?a.ctx:a.map,k;c[b]&&g&&(k=c[b])[g]||(g?(c=k||(c[b]=t()),c[g]=1,(k=h.get(g))?h=k:h.set(g,h=new Map)):c[b]=1,(k=h.get(b))?h=k:h.set(b,h=[]),h=h[d]||(h[d]=[]),f&&h.includes(e)||(h.push(e),a.fastupdate&&((c=a.reg.get(e))?c.push(h):a.reg.set(e,[h]))))}function J(a,c,b,d,e){return b&&1<a?c+(d||0)<=a?b+(e||0):(a-1)/(c+(d||0))*(b+(e||0))+1|0:0};function L(a,c,b){if(1===a.length)return a=a[0],a=b||a.length>c?c?a.slice(b,b+c):a.slice(b):a;let d=[];for(let e=0,f,g;e<a.length;e++)if((f=a[e])&&(g=f.length)){if(b){if(b>=g){b-=g;continue}b<g&&(f=c?f.slice(b,b+c):f.slice(b),g=f.length,b=0)}if(d.length)g>c&&(f=f.slice(0,c),g=f.length),d.push(f);else{if(g>=c)return g>c&&(f=f.slice(0,c)),f;d=[f]}c-=g;if(!c)break}return d.length?d=1<d.length?[].concat.apply([],d):d[0]:d};H.prototype.search=function(a,c,b){b||(c||"object"!==typeof a?"object"===typeof c&&(b=c,c=0):(b=a,a=""));var d=[],e=0;if(b){a=b.query||a;c=b.limit||c;e=b.offset||0;var f=b.context;var g=b.suggest}a=this.encoder.encode(a);b=a.length;c||(c=100);if(1===b)return M.call(this,a[0],"",c,e);f=this.depth&&!1!==f;if(2===b&&f&&!g)return M.call(this,a[0],a[1],c,e);var h=0,k=0;if(1<b){var p=t();const n=[];for(let r=0,l;r<b;r++)if((l=a[r])&&!p[l]){if(g||N(this,l))n.push(l),p[l]=1;else return d;const m=l.length;
+h=Math.max(h,m);k=k?Math.min(k,m):m}a=n;b=a.length}if(!b)return d;p=0;if(1===b)return M.call(this,a[0],"",c,e);if(2===b&&f&&!g)return M.call(this,a[0],a[1],c,e);if(1<b)if(f){var q=a[0];p=1}else 9<h&&3<h/k&&a.sort(u);for(let n,r;p<b;p++){r=a[p];q?(n=N(this,r,q),n=O(n,d,g,this.A),g&&!1===n&&d.length||(q=r)):(n=N(this,r,""),n=O(n,d,g,this.resolution));if(n)return n;if(g&&p===b-1){f=d.length;if(!f){if(q){q="";p=-1;continue}return d}if(1===f)return L(d[0],c,e)}}a:{a=d;d=this.resolution;q=a.length;b=[];
+f=t();for(let n=0,r,l,m,y;n<d;n++)for(k=0;k<q;k++)if(m=a[k],n<m.length&&(r=m[n]))for(p=0;p<r.length;p++)l=r[p],(h=f[l])?f[l]++:(h=0,f[l]=1),y=b[h]||(b[h]=[]),y.push(l);if(a=b.length)if(g){if(1<b.length){g=b;a=[];d=t();f=g.length;for(k=0;k<f;k++)for(q=g[k],h=q.length,p=0;p<h;p++)if(b=q[p],!d[b])if(d[b]=1,e)e--;else if(a.push(b),a.length===c)break;c=a}else c=b[0];b=c}else{if(a<q){d=[];break a}b=b[a-1];if(b.length>c||e)b=b.slice(e,c+e)}d=b}return d};
+function M(a,c,b,d){return(a=N(this,a,c))&&a.length?L(a,b,d):[]}function O(a,c,b,d){let e=[];if(a){d=Math.min(a.length,d);for(let f=0,g;f<d;f++)(g=a[f])&&g&&(e[f]=g);if(e.length){c.push(e);return}}return!b&&e}function N(a,c,b){let d;b&&(d=a.bidirectional&&c>b);a=b?(a=a.ctx.get(d?c:b))&&a.get(d?b:c):a.map.get(c);return a};H.prototype.remove=function(a,c){const b=this.reg.size&&(this.fastupdate?this.reg.get(a):this.reg.has(a));if(b){if(this.fastupdate)for(let d=0,e;d<b.length;d++){if(e=b[d])if(2>e.length)e.pop();else{const f=e.indexOf(a);f===b.length-1?e.pop():e.splice(f,1)}}else P(this.map,a),this.depth&&P(this.ctx,a);c||this.reg.delete(a)}this.cache&&this.cache.remove(a);return this};
+function P(a,c){let b=0;if(a.constructor===Array)for(let d=0,e,f;d<a.length;d++){if((e=a[d])&&e.length)if(f=e.indexOf(c),0<=f){1<e.length?(e.splice(f,1),b++):delete a[d];break}else b++}else for(let d of a){const e=d[0],f=P(d[1],c);f?b+=f:a.delete(e)}return b};function H(a,c){if(!this)return new H(a);a=a?G(a):{};const b=a.context||{},d="string"===typeof a.encoder?E[a.encoder]:a.encode||a.encoder||function(f){return f.toLowerCase().trim().split(/\s+/)};this.encoder=d.encode?d:"object"===typeof d?d:{encode:d};let e;this.resolution=a.resolution||9;this.tokenize=e=a.tokenize||"strict";this.depth="strict"===e&&b.depth||0;this.bidirectional=!1!==b.bidirectional;this.fastupdate=!!a.fastupdate;this.score=a.score||null;e=!1;this.map=new Map;this.ctx=new Map;this.reg=
+c||(this.fastupdate?new Map:new Set);this.A=b.resolution||1;this.rtl=d.rtl||a.rtl||!1;this.cache=(e=a.cache||null)&&new v(e)}H.prototype.clear=function(){this.map.clear();this.ctx.clear();this.reg.clear();this.cache&&this.cache.clear();return this};H.prototype.append=function(a,c){return this.add(a,c,!0)};H.prototype.contain=function(a){return this.reg.has(a)};H.prototype.update=function(a,c){const b=this,d=this.remove(a);return d&&d.then?d.then(()=>b.add(a,c)):this.add(a,c)};
 function Q(a){let c=0;if(a.constructor===Array)for(let b=0,d;b<a.length;b++)(d=a[b])&&(c+=d.length);else for(const b of a){const d=b[0],e=Q(b[1]);e?c+=e:a.delete(d)}return c}H.prototype.cleanup=function(){if(!this.fastupdate)return this;Q(this.map);this.depth&&Q(this.ctx);return this};
 H.prototype.searchCache=function(a,c,b){a=("object"===typeof a?""+a.query:a).toLowerCase();let d=this.cache.get(a);if(!d){d=this.search(a,c,b);if(d.then){const e=this;d.then(function(f){e.cache.set(a,f);return f})}this.cache.set(a,d)}return d};export default {Index:H,Charset:E,Encoder:null,Document:null,Worker:null,Resolver:null,IndexedDB:null,Language:{}};
 export const Index=H;export const Charset=E;export const Encoder=null;export const Document=null;export const Worker=null;export const Resolver=null;export const IndexedDB=null;export const Language={};
\ No newline at end of file
diff --git a/dist/module-debug/db/indexeddb/index.js b/dist/module-debug/db/indexeddb/index.js
index 5dfdc45..2fc8a26 100644
--- a/dist/module-debug/db/indexeddb/index.js
+++ b/dist/module-debug/db/indexeddb/index.js
@@ -139,6 +139,7 @@ IdxDB.prototype.clear = function () {
 };
 
 IdxDB.prototype.get = function (key, ctx, limit = 0, offset = 0, resolve = /* tag? */!0, enrich = !1) {
+    console.log("!!!!!!!!!!!");
     const transaction = this.db.transaction(ctx ? "ctx" : "map", "readonly"),
           map = transaction.objectStore(ctx ? "ctx" : "map"),
           req = map.get(ctx ? ctx + ":" + key : key),
diff --git a/dist/module-debug/db/postgres/index.js b/dist/module-debug/db/postgres/index.js
index 54b380d..504ba4c 100644
--- a/dist/module-debug/db/postgres/index.js
+++ b/dist/module-debug/db/postgres/index.js
@@ -11,7 +11,8 @@ const defaults = {
     host: "localhost",
     port: "5432"
 },
-      pgp = pg_promise({ noWarnings: ! /* tag? */!0 /*await rows.hasNext()*/ /*await rows.hasNext()*/ /*await rows.hasNext()*/ }),
+      pgp = pg_promise({ noWarnings: !
+    /* tag? */!0 /*await rows.hasNext()*/ /*await rows.hasNext()*/ /*await rows.hasNext()*/ }),
       VERSION = 1,
       MAXIMUM_QUERY_VARS = 16000,
       fields = ["map", "ctx", "reg", "tag", "cfg"],
diff --git a/dist/module-debug/document.js b/dist/module-debug/document.js
index 877f3a7..e991f2a 100644
--- a/dist/module-debug/document.js
+++ b/dist/module-debug/document.js
@@ -49,7 +49,8 @@ export default function Document(options) {
     this.cache = (tmp = options.cache || null) && new Cache(tmp);
     // do not apply cache again for the indexes since .searchCache()
     // is just a wrapper over .search()
-    options.cache = /* suggest */ /* append: */ /* enrich */!1;
+    options.cache = /* suggest */ /* append: */
+    /* enrich */!1;
 
     this.worker = options.worker;
 
@@ -99,7 +100,21 @@ export default function Document(options) {
         }
     }
 
-    options.db && this.mount(options.db);
+
+    if (this.worker) {
+        const promises = [];
+        for (const index of this.index.values()) {
+            index.worker.then && promises.push(index.worker);
+        }
+        if (promises.length) {
+            const self = this;
+            return Promise.all(promises).then(function () {
+                return self;
+            });
+        }
+    } else {
+        options.db && this.mount(options.db);
+    }
 }
 
 Document.prototype.mount = function (db) {
@@ -209,8 +224,9 @@ function parse_descriptor(options, document) {
 
         if (this.worker) {
             const worker = new WorkerIndex(opt);
-            index.set(key, worker);
-            if (!worker.worker) {
+            if (worker.worker) {
+                index.set(key, worker);
+            } else {
                 // fallback when not supported
                 this.worker = !1;
             }
diff --git a/dist/module-debug/index.js b/dist/module-debug/index.js
index 5dfbbcb..42e963d 100644
--- a/dist/module-debug/index.js
+++ b/dist/module-debug/index.js
@@ -37,7 +37,7 @@ export default function Index(options, _register) {
 
     /** @type ContextOptions */
     const context = options.context || {},
-          encoder = options.encode || options.encoder || default_encoder;
+          encoder = is_string(options.encoder) ? Charset[options.encoder] : options.encode || options.encoder || default_encoder;
 
     /** @type Encoder */
     this.encoder = encoder.encode ? encoder : "object" == typeof encoder ? new Encoder(encoder) : { encode: encoder };
@@ -67,7 +67,7 @@ export default function Index(options, _register) {
     this.resolve = !1 !== options.resolve;
 
     if (tmp = options.db) {
-        this.db = tmp.mount(this);
+        this.db = this.mount(tmp);
     }
     this.commit_auto = !1 !== options.commit;
     this.commit_task = [];
diff --git a/dist/module-debug/index/search.js b/dist/module-debug/index/search.js
index 29b3422..d42576f 100644
--- a/dist/module-debug/index/search.js
+++ b/dist/module-debug/index/search.js
@@ -173,6 +173,8 @@ Index.prototype.search = function (query, limit, options) {
             }
     }
 
+    // from this point there are just multi-term queries
+
     if (this.db) {
 
         if (this.db.search) {
@@ -190,10 +192,12 @@ Index.prototype.search = function (query, limit, options) {
 
                 if (keyword) {
 
-                    arr = await self.get_array(term, keyword);
-                    arr = add_result(arr, result, suggest, self.resolution_ctx,
-                    /** @type {!number} */limit, offset, 2 === length
-                    /*, term, keyword*/
+                    arr = await self.get_array(term, keyword, 0, 0, !1, !1);
+                    arr = add_result(arr, result, suggest, self.resolution_ctx
+                    // 0, // /** @type {!number} */ (limit),
+                    // 0, // offset,
+                    // length === 2
+                    // /*, term, keyword*/
                     );
 
                     // the context is a moving window where the keyword is going forward like a cursor
@@ -204,10 +208,12 @@ Index.prototype.search = function (query, limit, options) {
                     }
                 } else {
 
-                    arr = await self.get_array(term);
-                    arr = add_result(arr, result, suggest, self.resolution,
-                    /** @type {!number} */limit, offset, 1 === length
-                    /*, term*/
+                    arr = await self.get_array(term, "", 0, 0, !1, !1);
+                    arr = add_result(arr, result, suggest, self.resolution
+                    // 0, // /** @type {!number} */ (limit),
+                    // 0, // offset,
+                    // length === 1
+                    // /*, term*/
                     );
                 }
 
@@ -243,10 +249,12 @@ Index.prototype.search = function (query, limit, options) {
 
         if (keyword) {
 
-            arr = this.get_array(term, keyword);
-            arr = /*this.*/add_result(arr, result, suggest, this.resolution_ctx,
-            /** @type {!number} */limit, offset, 2 === length
-            /*, term, keyword*/
+            arr = this.get_array(term, keyword, 0, 0, !1, !1);
+            arr = /*this.*/add_result(arr, result, suggest, this.resolution_ctx
+            // 0, // /** @type {!number} */ (limit),
+            // 0, // offset,
+            // length === 2
+            // /*, term, keyword*/
             );
 
             // 1. when suggestion enabled just forward keyword if term was found
@@ -256,10 +264,12 @@ Index.prototype.search = function (query, limit, options) {
             }
         } else {
 
-            arr = this.get_array(term);
-            arr = /*this.*/add_result(arr, result, suggest, this.resolution,
-            /** @type {!number} */limit, offset, 1 === length
-            /*, term*/
+            arr = this.get_array(term, "", 0, 0, !1, !1);
+            arr = /*this.*/add_result(arr, result, suggest, this.resolution
+            // 0, // /** @type {!number} */ (limit),
+            // 0, // offset,
+            // length === 1
+            // /*, term*/
             );
         }
 
@@ -327,13 +337,10 @@ function single_term_query(term, keyword, limit, offset, resolve, enrich, tag) {
  * @param {Array} result
  * @param {Array} suggest
  * @param {number} resolution
- * @param {number} limit
- * @param {number} offset
- * @param {boolean} single_term
  * @return {Array|boolean|undefined}
  */
 
-function add_result(arr, result, suggest, resolution, limit, offset, single_term /*, term, keyword*/) {
+function add_result(arr, result, suggest, resolution /*, limit, offset single_term, term, keyword*/) {
 
     let word_arr = [];
     //let arr;// = keyword ? this.ctx : this.map;
@@ -345,21 +352,22 @@ function add_result(arr, result, suggest, resolution, limit, offset, single_term
         // apply reduced resolution for queries
         resolution = Math.min(arr.length, resolution);
 
-        for (let x = 0, size = 0, tmp; x < resolution; x++) {
+        for (let x = 0, tmp; x < resolution; x++) {
             if (tmp = arr[x]) {
 
-                if (offset) {
-                    // apply offset right here on single terms
-                    if (tmp && single_term) {
-                        if (tmp.length <= offset) {
-                            offset -= tmp.length;
-                            tmp = null;
-                        } else {
-                            tmp = tmp.slice(offset);
-                            offset = 0;
-                        }
-                    }
-                }
+                // if(offset){
+                //     // apply offset right here on single terms
+                //     if(tmp && single_term){
+                //         if(tmp.length <= offset){
+                //             offset -= tmp.length;
+                //             tmp = null;
+                //         }
+                //         else{
+                //             tmp = tmp.slice(offset);
+                //             offset = 0;
+                //         }
+                //     }
+                // }
 
                 if (tmp) {
 
@@ -368,25 +376,25 @@ function add_result(arr, result, suggest, resolution, limit, offset, single_term
                     // simplified score order:
                     //word_arr.push(tmp);
 
-                    if (single_term) {
-                        size += tmp.length;
-                        if (size >= limit) {
-                            // fast path:
-                            // a single term does not need to pre-collect results
-                            break;
-                        }
-                    }
+                    // if(single_term){
+                    //     size += tmp.length;
+                    //     if(size >= limit){
+                    //         // fast path:
+                    //         // a single term does not need to pre-collect results
+                    //         break;
+                    //     }
+                    // }
                 }
             }
         }
 
         if (word_arr.length) {
-            if (single_term) {
-                // fast path optimization
-                // offset was already applied at this point
-                // return an array will stop the query process immediately
-                return resolve_default(word_arr, limit, 0);
-            }
+            // if(single_term){
+            //     // fast path optimization
+            //     // offset was already applied at this point
+            //     // return an array will stop the query process immediately
+            //     return resolve_default(word_arr, limit, 0);
+            // }
 
             result.push(word_arr);
             // return nothing will continue the query
diff --git a/dist/module-debug/type.js b/dist/module-debug/type.js
index 2e43ec3..24d1aa9 100644
--- a/dist/module-debug/type.js
+++ b/dist/module-debug/type.js
@@ -19,10 +19,11 @@ import StorageInterface from "./db/interface.js";
  *   resolve: [boolean=true],
  *   db: StorageInterface|undefined,
  *   commit: boolean=true,
+ *   worker: boolean|string|undefined,
  *   config: string|undefined
  * }}
  */
-export let IndexOptions;
+export let IndexOptions = {};
 
 /**
  * @typedef DocumentIndexOptions {{
@@ -40,13 +41,12 @@ export let IndexOptions;
  *   db: StorageInterface|undefined,
  *   commit: boolean=true,
  *   config: string|undefined,
- *
  *   field: string,
  *   filter: Function|undefined,
  *   custom: Function|undefined
  * }}
  */
-export let DocumentIndexOptions;
+export let DocumentIndexOptions = {};
 
 /**
  * @typedef DocumentOptions {{
@@ -66,7 +66,7 @@ export let DocumentIndexOptions;
  *   worker: boolean|string|undefined
  * }}
  */
-export let DocumentOptions;
+export let DocumentOptions = {};
 
 /**
  * @typedef ContextOptions {{
@@ -75,7 +75,7 @@ export let DocumentOptions;
  *   resolution: number|undefined
  * }}
  */
-export let ContextOptions;
+export let ContextOptions = {};
 
 /**
  * @typedef DocumentDescriptor {{
@@ -86,7 +86,7 @@ export let ContextOptions;
  *   store: StoreOptions|Array<StoreOptions>|undefined
  * }}
  */
-export let DocumentDescriptor;
+export let DocumentDescriptor = {};
 
 /**
  * @typedef TagOptions {{
@@ -99,7 +99,7 @@ export let DocumentDescriptor;
  *   config: string|undefined
  * }}
  */
-export let TagOptions;
+export let TagOptions = {};
 
 /**
  * @typedef StoreOptions {{
@@ -109,7 +109,7 @@ export let TagOptions;
  *   config: string|undefined
  * }}
  */
-export let StoreOptions;
+export let StoreOptions = {};
 
 /**
  * @typedef SearchOptions {{
@@ -122,7 +122,7 @@ export let StoreOptions;
  *   enrich: [boolean=false],
  * }}
  */
-export let SearchOptions;
+export let SearchOptions = {};
 // tag: Array|undefined
 
 /**
@@ -140,7 +140,7 @@ export let SearchOptions;
  *   merge: [boolean=false]
  * }}
  */
-export let DocumentSearchOptions;
+export let DocumentSearchOptions = {};
 
 /**
  * @typedef EncoderOptions {{
@@ -161,7 +161,7 @@ export let DocumentSearchOptions;
  *   cache: boolean=true,
  * }}
  */
-export let EncoderOptions;
+export let EncoderOptions = {};
 
 /**
  * @typedef EncoderSplitOptions {{
@@ -173,7 +173,7 @@ export let EncoderOptions;
  *   char: string|Array<string>|undefined,
  * }}
  */
-export let EncoderSplitOptions;
+export let EncoderSplitOptions = {};
 
 /**
  * @typedef PersistentOptions {{
@@ -183,4 +183,4 @@ export let EncoderSplitOptions;
  *   db: *|undefined
  * }}
  */
-export let PersistentOptions;
\ No newline at end of file
+export let PersistentOptions = {};
\ No newline at end of file
diff --git a/dist/module-debug/webpack.js b/dist/module-debug/webpack.js
index 128e45a..e3f9974 100644
--- a/dist/module-debug/webpack.js
+++ b/dist/module-debug/webpack.js
@@ -44,6 +44,7 @@ import Charset from "./charset.js";
 /** @export */Index.prototype.cache;
 /** @export */Index.prototype.bypass;
 /** @export */Index.prototype.document;
+/** @export */Index.prototype.encoder;
 
 /** @export */Document.prototype.add;
 /** @export */Document.prototype.append;
diff --git a/dist/module-debug/worker.js b/dist/module-debug/worker.js
index 97189d3..4079eb6 100644
--- a/dist/module-debug/worker.js
+++ b/dist/module-debug/worker.js
@@ -1,4 +1,3 @@
-//import { promise as Promise } from "../polyfill.js";
 import { IndexOptions } from "./type.js";
 import { create_object, is_function, is_object, is_string } from "./common.js";
 import handler from "./worker/handler.js";
@@ -10,20 +9,15 @@ let pid = 0;
  * @constructor
  */
 
-export default function WorkerIndex(options) {
+export default function WorkerIndex(options = {}) {
 
     if (!this) {
         return new WorkerIndex(options);
     }
 
-    if (!options) {
-        options = {};
-    }
-
     // the factory is the outer wrapper from the build
-    // we use "self" as a trap for node.js
-
-    let factory = "undefined" != typeof self && (self || window)._factory;
+    // it uses "self" as a trap for node.js
+    let factory = "undefined" != typeof self ? self._factory : "undefined" != typeof window ? window._factory : null;
     if (factory) {
         factory = factory.toString();
     }
@@ -31,9 +25,18 @@ export default function WorkerIndex(options) {
     const is_node_js = "undefined" == typeof window /*&& self["exports"]*/,
           _self = this;
 
-    (async function () {
+    /**
+     * @param {Worker=} _worker
+     * @this {WorkerIndex}
+     */
+    function init(_worker) {
+
+        this.worker = _worker || create(factory, is_node_js, options.worker);
+
+        if (this.worker.then) {
+            return this.worker.then(init);
+        }
 
-        this.worker = await create(factory, is_node_js, options.worker);
         this.resolver = create_object();
 
         if (!this.worker) {
@@ -55,14 +58,16 @@ export default function WorkerIndex(options) {
 
         if (options.config) {
 
-            delete options.db;
+            //delete options.db;
 
             // when extern configuration needs to be loaded
             // it needs to return a promise to await for
             return new Promise(function (resolve) {
+
                 _self.resolver[++pid] = function () {
                     resolve(_self);
                 };
+
                 _self.worker.postMessage({
                     id: pid,
                     task: "init",
@@ -77,7 +82,11 @@ export default function WorkerIndex(options) {
             factory: factory,
             options: options
         });
-    }).call(this);
+
+        return this.worker;
+    }
+
+    this.worker = init.call(this);
 }
 
 register("add");
@@ -88,7 +97,7 @@ register("remove");
 
 function register(key) {
 
-    WorkerIndex.prototype[key] = WorkerIndex.prototype[key + "Async"] = function () {
+    WorkerIndex.prototype[key] = WorkerIndex.prototype[key + "Async"] = async function () {
         const self = this,
               args = [].slice.call(arguments),
               arg = args[args.length - 1];
@@ -121,14 +130,16 @@ function register(key) {
     };
 }
 
-async function create(factory, is_node_js, worker_path) {
+function create(factory, is_node_js, worker_path) {
 
     let worker = is_node_js ?
     // This eval will be removed when compiling, it isn't there in final build
 
     "undefined" != typeof module ? (0, eval)('new (require("worker_threads")["Worker"])(__dirname + "/node/node.js")')
     //: (0,eval)('new ((await import("worker_threads"))["Worker"])(import.meta.dirname + "/worker/node.mjs")')
-    : (0, eval)('new ((await import("worker_threads"))["Worker"])((1,eval)(\"import.meta.dirname\") + "/node/node.mjs")')
+    //: (0,eval)('new ((await import("worker_threads"))["Worker"])((1,eval)(\"import.meta.dirname\") + "/node/node.mjs")')
+    : (0, eval)('import("worker_threads").then(function(worker){ return new worker["Worker"]((1,eval)(\"import.meta.dirname\") + "/node/node.mjs"); })')
+    //: import("worker_threads").then(function(worker){ return new worker["Worker"](import.meta.dirname + "/worker/node.mjs"); })
 
     //eval('new (require("worker_threads")["Worker"])(__dirname + "/node/node.js")')
     : factory ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + handler.toString()], { type: "text/javascript" }))) : new window.Worker(is_string(worker_path) ? worker_path : "worker/worker.js", { type: "module" });
diff --git a/dist/module-debug/worker/handler.js b/dist/module-debug/worker/handler.js
index 0ada932..f918d7d 100644
--- a/dist/module-debug/worker/handler.js
+++ b/dist/module-debug/worker/handler.js
@@ -3,59 +3,53 @@ import { IndexOptions } from "../type.js";
 
 export default (async function (data) {
 
-            data = data.data;
+    data = data.data;
 
-            /** @type Index */
-            const index = self._index,
-                  args = data.args,
-                  task = data.task;
+    /** @type Index */
+    const index = self._index,
+          args = data.args,
+          task = data.task;
 
 
-            switch (task) {
+    switch (task) {
 
-                        case "init":
+        case "init":
 
-                                    /** @type IndexOptions */
-                                    let options = data.options || {},
-                                        filepath = options.config;
+            /** @type IndexOptions */
+            let options = data.options || {},
+                filepath = options.config;
 
-                                    if (filepath) {
-                                                options = filepath;
-                                                // will be replaced after build with the line below because
-                                                // there is an issue with closure compiler dynamic import
-                                                //options = await import(filepath);
-                                    }
-
-                                    // deprecated:
-                                    // const encode = options.encode;
-                                    // if(encode && (encode.indexOf("function") === 0)){
-                                    //     options.encode = Function("return " + encode)();
-                                    // }
-
-                                    const factory = data.factory;
-
-                                    if (factory) {
-
-                                                // export the FlexSearch global payload to "self"
-                                                Function("return " + factory)()(self);
-
-                                                /** @type Index */
-                                                self._index = new self.FlexSearch.Index(options);
-
-                                                // destroy the exported payload
-                                                delete self.FlexSearch;
-                                    } else {
-
-                                                self._index = new Index(options);
-                                    }
-
-                                    postMessage({ id: data.id });
-                                    break;
-
-                        default:
-                                    const id = data.id,
-                                          message = index[task].apply(index, args);
-
-                                    postMessage("search" === task ? { id: id, msg: message } : { id: id });
+            if (filepath) {
+                options = filepath;
+                // will be replaced after build with the line below because
+                // there is an issue with closure compiler dynamic import
+                //options = await import(filepath);
             }
+
+            const factory = data.factory;
+
+            if (factory) {
+
+                // export the FlexSearch global payload to "self"
+                Function("return " + factory)()(self);
+
+                /** @type Index */
+                self._index = new self.FlexSearch.Index(options);
+
+                // destroy the exported payload
+                delete self.FlexSearch;
+            } else {
+
+                self._index = new Index(options);
+            }
+
+            postMessage({ id: data.id });
+            break;
+
+        default:
+            const id = data.id,
+                  message = index[task].apply(index, args);
+
+            postMessage("search" === task ? { id: id, msg: message } : { id: id });
+    }
 });
\ No newline at end of file
diff --git a/dist/module-debug/worker/node.js b/dist/module-debug/worker/node.js
index d11807a..48f0621 100644
--- a/dist/module-debug/worker/node.js
+++ b/dist/module-debug/worker/node.js
@@ -7,43 +7,35 @@ const { parentPort } = require("worker_threads"),
 
 let index;
 
-parentPort.on("message", function (data) {
+parentPort.on("message", async function (data) {
 
-            /** @type Index */
-            const args = data.args,
-                  task = data.task,
-                  id = data.id;
+    /** @type Index */
+    const args = data.args,
+          task = data.task,
+          id = data.id;
 
 
-            switch (task) {
+    switch (task) {
 
-                        case "init":
-                                    let options = data.options || {},
-                                        filepath = options.config;
+        case "init":
+            let options = data.options || {},
+                filepath = options.config;
+            // load extern field configuration
 
-                                    // load extern field configuration
-
-                                    // if(filepath && filepath[0] !== "/" && filepath[0] !== "\\"){
-                                    //     // current working directory
-                                    //     const dir = process.cwd();
-                                    //     filepath = join(dir, filepath);
-                                    // }
-                                    if (filepath) {
-                                                options = require(filepath);
-                                    }
-
-                                    // deprecated:
-                                    // const encode = options["encode"];
-                                    // if(encode && (encode.indexOf("function") === 0)){
-                                    //     options["encode"] = new Function("return " + encode)();
-                                    // }
-
-                                    index = new Index(options);
-                                    break;
-
-                        default:
-
-                                    const message = index[task].apply(index, args);
-                                    parentPort.postMessage("search" === task ? { id: id, msg: message } : { id: id });
+            if (filepath) {
+                options = Object.assign({}, options, require(filepath));
+                delete options.worker;
             }
+
+            index = new Index(options);
+            //index.db && await index.db;
+            parentPort.postMessage({ id: id });
+
+            break;
+
+        default:
+
+            const message = index[task].apply(index, args);
+            parentPort.postMessage("search" === task ? { id: id, msg: message } : { id: id });
+    }
 });
\ No newline at end of file
diff --git a/dist/module-min/db/indexeddb/index.js b/dist/module-min/db/indexeddb/index.js
index ccbd409..9c9ffd4 100644
--- a/dist/module-min/db/indexeddb/index.js
+++ b/dist/module-min/db/indexeddb/index.js
@@ -1 +1 @@
-import{PersistentOptions}from"../../type.js";const VERSION=1,IndexedDB="undefined"!=typeof window&&(window.indexedDB||window.mozIndexedDB||window.webkitIndexedDB||window.msIndexedDB),IDBTransaction="undefined"!=typeof window&&(window.IDBTransaction||window.webkitIDBTransaction||window.msIDBTransaction),IDBKeyRange="undefined"!=typeof window&&(window.IDBKeyRange||window.webkitIDBKeyRange||window.msIDBKeyRange),fields=["map","ctx","tag","reg","cfg"];import StorageInterface from"../interface.js";import{toArray}from"../../common.js";function sanitize(a){return a.toLowerCase().replace(/[^a-z0-9_\-]/g,"")}export default function IdxDB(a,b={}){return this?void("object"==typeof a&&(a=a.name,b=a),!a&&console.info("Default storage space was used, because a name was not passed."),this.id="flexsearch"+(a?":"+sanitize(a):""),this.field=b.field?sanitize(b.field):"",this.support_tag_search=!1,this.db=null,this.trx={}):new IdxDB(a,b)}IdxDB.prototype.mount=function(a){return a.encoder?(a.db=this,this.open()):a.mount(this)},IdxDB.prototype.open=function(){let a=this;return navigator.storage&&navigator.storage.persist(),this.db||new Promise(function(b,c){const d=IndexedDB.open(a.id+(a.field?":"+a.field:""),VERSION);d.onupgradeneeded=function(){const b=a.db=this.result;fields.forEach(a=>{b.objectStoreNames.contains(a)||b.createObjectStore(a)})},d.onblocked=function(a){console.error("blocked",a),c()},d.onerror=function(a){console.error(this.error,a),c()},d.onsuccess=function(){a.db=this.result,a.db.onversionchange=function(){a.close()},b(a)}})},IdxDB.prototype.close=function(){this.db.close(),this.db=null},IdxDB.prototype.destroy=function(){return IndexedDB.deleteDatabase(this.id+(this.field?":"+this.field:""))},IdxDB.prototype.clear=function(){const a=this.db.transaction(fields,"readwrite");for(let b=0;b<fields.length;b++)a.objectStore(fields[b]).clear();return promisfy(a)},IdxDB.prototype.get=function(a,b,c=0,d=0,e=!0,f=!1){const g=this.db.transaction(b?"ctx":"map","readonly"),h=g.objectStore(b?"ctx":"map"),i=h.get(b?b+":"+a:a),j=this;return promisfy(i).then(function(a){let b=[];if(!a||!a.length)return b;if(e){if(!c&&!d&&1===a.length)return a[0];for(let e,f=0;f<a.length;f++)if((e=a[f])&&e.length){if(d>=e.length){d-=e.length;continue}const a=c?d+Math.min(e.length-d,c):e.length;for(let c=d;c<a;c++)b.push(e[c]);if(d=0,b.length===c)break}return f?j.enrich(b):b}return a})},IdxDB.prototype.tag=function(a,b=0,c=0,d=!1){const e=this.db.transaction("tag","readonly"),f=e.objectStore("tag"),g=f.get(a),h=this;return promisfy(g).then(function(a){if(!a||!a.length||c>=a.length)return[];if(!b&&!c)return a;const e=a.slice(c,c+b);return d?h.enrich(e):e})},IdxDB.prototype.enrich=function(a){"object"!=typeof a&&(a=[a]);const b=this.db.transaction("reg","readonly"),c=b.objectStore("reg"),d=[];for(let b=0;b<a.length;b++)d[b]=promisfy(c.get(a[b]));return Promise.all(d).then(function(b){for(let c=0;c<b.length;c++)b[c]={id:a[c],doc:b[c]?JSON.parse(b[c]):null};return b})},IdxDB.prototype.has=function(a){const b=this.db.transaction("reg","readonly"),c=b.objectStore("reg"),d=c.getKey(a);return promisfy(d)},IdxDB.prototype.search=null,IdxDB.prototype.info=function(){},IdxDB.prototype.transaction=function(a,b,c){let d=this.trx[a+":"+b];if(d)return c.call(this,d);let e=this.db.transaction(a,b);return this.trx[a+":"+b]=d=e.objectStore(a),new Promise((f,g)=>(e.onerror=c=>{this.trx[a+":"+b]=null,e.abort(),e=d=null,g(c)},e.oncomplete=c=>{this.trx[a+":"+b]=null,e=d=null,f(c||!0)},c.call(this,d)))},IdxDB.prototype.commit=async function(a,b,c){if(b)await this.clear(),a.commit_task=[];else{let d=a.commit_task;a.commit_task=[];for(let a,c=0;c<d.length;c++)if(a=d[c],a.clear){await this.clear(),b=!0;break}else d[c]=a.del;b||(!c&&(d=d.concat(toArray(a.reg))),d.length&&(await this.remove(d)))}a.reg.size&&(await this.transaction("map","readwrite",function(c){for(const d of a.map){const a=d[0],e=d[1];if(e.length){if(b){c.put(e,a);continue}c.get(a).onsuccess=function(){let b,d=this.result;if(d&&d.length){const a=Math.max(d.length,e.length);for(let c,f,g=0;g<a;g++)if(f=e[g],f&&f.length)if(c=d[g],c&&c.length){for(let a=0;a<f.length;a++)c.push(f[a]);b=1}else d[g]=f,b=1}else d=e,b=1;b&&c.put(d,a)}}}}),await this.transaction("ctx","readwrite",function(c){for(const d of a.ctx){const a=d[0],e=d[1];for(const d of e){const e=d[0],f=d[1];if(f.length){if(b){c.put(f,a+":"+e);continue}c.get(a+":"+e).onsuccess=function(){let b,d=this.result;if(d&&d.length){const a=Math.max(d.length,f.length);for(let c,e,g=0;g<a;g++)if(e=f[g],e&&e.length)if(c=d[g],c&&c.length){for(let a=0;a<e.length;a++)c.push(e[a]);b=1}else d[g]=e,b=1}else d=f,b=1;b&&c.put(d,a+":"+e)}}}}}),a.store?await this.transaction("reg","readwrite",function(b){for(const c of a.store){const a=c[0],d=c[1];b.put("object"==typeof d?JSON.stringify(d):1,a)}}):!a.bypass&&(await this.transaction("reg","readwrite",function(b){for(const c of a.reg.keys())b.put(1,c)})),a.tag&&(await this.transaction("tag","readwrite",function(b){for(const c of a.tag){const a=c[0],d=c[1];d.length&&(b.get(a).onsuccess=function(){let c=this.result;c=c&&c.length?c.concat(d):d,b.put(c,a)})}})),a.map.clear(),a.ctx.clear(),a.tag&&a.tag.clear(),a.store&&a.store.clear(),a.document||a.reg.clear())};function handle(a,b,c){const d=a.value;let e,f,g=0;for(let h,i=0;i<d.length;i++){if(h=c?d:d[i]){for(let a,c,g=0;g<b.length;g++)if(c=b[g],a=h.indexOf(f?parseInt(c,10):c),!(0>a)||f||"string"!=typeof c||isNaN(c)||(a=h.indexOf(parseInt(c,10)),a&&(f=1)),0<=a)if(e=1,1<h.length)h.splice(a,1);else{d[i]=[];break}g+=h.length}if(c)break}g?e&&a.update(d):a.delete(),a.continue()}IdxDB.prototype.remove=function(a){return"object"!=typeof a&&(a=[a]),Promise.all([this.transaction("map","readwrite",function(b){b.openCursor().onsuccess=function(){const b=this.result;b&&handle(b,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){const b=this.result;b&&handle(b,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){const b=this.result;b&&handle(b,a,!0)}}),this.transaction("reg","readwrite",function(b){for(let c=0;c<a.length;c++)b.delete(a[c])})])};function promisfy(a,b){return new Promise((c,d)=>{a.onsuccess=function(){b&&b(this.result),c(this.result)},a.oncomplete=function(){b&&b(this.result),c(this.result)},a.onerror=d,a=null})}
\ No newline at end of file
+import{PersistentOptions}from"../../type.js";const VERSION=1,IndexedDB="undefined"!=typeof window&&(window.indexedDB||window.mozIndexedDB||window.webkitIndexedDB||window.msIndexedDB),IDBTransaction="undefined"!=typeof window&&(window.IDBTransaction||window.webkitIDBTransaction||window.msIDBTransaction),IDBKeyRange="undefined"!=typeof window&&(window.IDBKeyRange||window.webkitIDBKeyRange||window.msIDBKeyRange),fields=["map","ctx","tag","reg","cfg"];import StorageInterface from"../interface.js";import{toArray}from"../../common.js";function sanitize(a){return a.toLowerCase().replace(/[^a-z0-9_\-]/g,"")}export default function IdxDB(a,b={}){return this?void("object"==typeof a&&(a=a.name,b=a),!a&&console.info("Default storage space was used, because a name was not passed."),this.id="flexsearch"+(a?":"+sanitize(a):""),this.field=b.field?sanitize(b.field):"",this.support_tag_search=!1,this.db=null,this.trx={}):new IdxDB(a,b)}IdxDB.prototype.mount=function(a){return a.encoder?(a.db=this,this.open()):a.mount(this)},IdxDB.prototype.open=function(){let a=this;return navigator.storage&&navigator.storage.persist(),this.db||new Promise(function(b,c){const d=IndexedDB.open(a.id+(a.field?":"+a.field:""),VERSION);d.onupgradeneeded=function(){const b=a.db=this.result;fields.forEach(a=>{b.objectStoreNames.contains(a)||b.createObjectStore(a)})},d.onblocked=function(a){console.error("blocked",a),c()},d.onerror=function(a){console.error(this.error,a),c()},d.onsuccess=function(){a.db=this.result,a.db.onversionchange=function(){a.close()},b(a)}})},IdxDB.prototype.close=function(){this.db.close(),this.db=null},IdxDB.prototype.destroy=function(){return IndexedDB.deleteDatabase(this.id+(this.field?":"+this.field:""))},IdxDB.prototype.clear=function(){const a=this.db.transaction(fields,"readwrite");for(let b=0;b<fields.length;b++)a.objectStore(fields[b]).clear();return promisfy(a)},IdxDB.prototype.get=function(a,b,c=0,d=0,e=!0,f=!1){console.log("!!!!!!!!!!!");const g=this.db.transaction(b?"ctx":"map","readonly"),h=g.objectStore(b?"ctx":"map"),i=h.get(b?b+":"+a:a),j=this;return promisfy(i).then(function(a){let b=[];if(!a||!a.length)return b;if(e){if(!c&&!d&&1===a.length)return a[0];for(let e,f=0;f<a.length;f++)if((e=a[f])&&e.length){if(d>=e.length){d-=e.length;continue}const a=c?d+Math.min(e.length-d,c):e.length;for(let c=d;c<a;c++)b.push(e[c]);if(d=0,b.length===c)break}return f?j.enrich(b):b}return a})},IdxDB.prototype.tag=function(a,b=0,c=0,d=!1){const e=this.db.transaction("tag","readonly"),f=e.objectStore("tag"),g=f.get(a),h=this;return promisfy(g).then(function(a){if(!a||!a.length||c>=a.length)return[];if(!b&&!c)return a;const e=a.slice(c,c+b);return d?h.enrich(e):e})},IdxDB.prototype.enrich=function(a){"object"!=typeof a&&(a=[a]);const b=this.db.transaction("reg","readonly"),c=b.objectStore("reg"),d=[];for(let b=0;b<a.length;b++)d[b]=promisfy(c.get(a[b]));return Promise.all(d).then(function(b){for(let c=0;c<b.length;c++)b[c]={id:a[c],doc:b[c]?JSON.parse(b[c]):null};return b})},IdxDB.prototype.has=function(a){const b=this.db.transaction("reg","readonly"),c=b.objectStore("reg"),d=c.getKey(a);return promisfy(d)},IdxDB.prototype.search=null,IdxDB.prototype.info=function(){},IdxDB.prototype.transaction=function(a,b,c){let d=this.trx[a+":"+b];if(d)return c.call(this,d);let e=this.db.transaction(a,b);return this.trx[a+":"+b]=d=e.objectStore(a),new Promise((f,g)=>(e.onerror=c=>{this.trx[a+":"+b]=null,e.abort(),e=d=null,g(c)},e.oncomplete=c=>{this.trx[a+":"+b]=null,e=d=null,f(c||!0)},c.call(this,d)))},IdxDB.prototype.commit=async function(a,b,c){if(b)await this.clear(),a.commit_task=[];else{let d=a.commit_task;a.commit_task=[];for(let a,c=0;c<d.length;c++)if(a=d[c],a.clear){await this.clear(),b=!0;break}else d[c]=a.del;b||(!c&&(d=d.concat(toArray(a.reg))),d.length&&(await this.remove(d)))}a.reg.size&&(await this.transaction("map","readwrite",function(c){for(const d of a.map){const a=d[0],e=d[1];if(e.length){if(b){c.put(e,a);continue}c.get(a).onsuccess=function(){let b,d=this.result;if(d&&d.length){const a=Math.max(d.length,e.length);for(let c,f,g=0;g<a;g++)if(f=e[g],f&&f.length)if(c=d[g],c&&c.length){for(let a=0;a<f.length;a++)c.push(f[a]);b=1}else d[g]=f,b=1}else d=e,b=1;b&&c.put(d,a)}}}}),await this.transaction("ctx","readwrite",function(c){for(const d of a.ctx){const a=d[0],e=d[1];for(const d of e){const e=d[0],f=d[1];if(f.length){if(b){c.put(f,a+":"+e);continue}c.get(a+":"+e).onsuccess=function(){let b,d=this.result;if(d&&d.length){const a=Math.max(d.length,f.length);for(let c,e,g=0;g<a;g++)if(e=f[g],e&&e.length)if(c=d[g],c&&c.length){for(let a=0;a<e.length;a++)c.push(e[a]);b=1}else d[g]=e,b=1}else d=f,b=1;b&&c.put(d,a+":"+e)}}}}}),a.store?await this.transaction("reg","readwrite",function(b){for(const c of a.store){const a=c[0],d=c[1];b.put("object"==typeof d?JSON.stringify(d):1,a)}}):!a.bypass&&(await this.transaction("reg","readwrite",function(b){for(const c of a.reg.keys())b.put(1,c)})),a.tag&&(await this.transaction("tag","readwrite",function(b){for(const c of a.tag){const a=c[0],d=c[1];d.length&&(b.get(a).onsuccess=function(){let c=this.result;c=c&&c.length?c.concat(d):d,b.put(c,a)})}})),a.map.clear(),a.ctx.clear(),a.tag&&a.tag.clear(),a.store&&a.store.clear(),a.document||a.reg.clear())};function handle(a,b,c){const d=a.value;let e,f,g=0;for(let h,i=0;i<d.length;i++){if(h=c?d:d[i]){for(let a,c,g=0;g<b.length;g++)if(c=b[g],a=h.indexOf(f?parseInt(c,10):c),!(0>a)||f||"string"!=typeof c||isNaN(c)||(a=h.indexOf(parseInt(c,10)),a&&(f=1)),0<=a)if(e=1,1<h.length)h.splice(a,1);else{d[i]=[];break}g+=h.length}if(c)break}g?e&&a.update(d):a.delete(),a.continue()}IdxDB.prototype.remove=function(a){return"object"!=typeof a&&(a=[a]),Promise.all([this.transaction("map","readwrite",function(b){b.openCursor().onsuccess=function(){const b=this.result;b&&handle(b,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){const b=this.result;b&&handle(b,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){const b=this.result;b&&handle(b,a,!0)}}),this.transaction("reg","readwrite",function(b){for(let c=0;c<a.length;c++)b.delete(a[c])})])};function promisfy(a,b){return new Promise((c,d)=>{a.onsuccess=function(){b&&b(this.result),c(this.result)},a.oncomplete=function(){b&&b(this.result),c(this.result)},a.onerror=d,a=null})}
\ No newline at end of file
diff --git a/dist/module-min/document.js b/dist/module-min/document.js
index 2f4e4f8..9eccb12 100644
--- a/dist/module-min/document.js
+++ b/dist/module-min/document.js
@@ -1 +1 @@
-import{DocumentOptions,DocumentDescriptor,DocumentIndexOptions,StoreOptions}from"./type.js";import Index from"./index.js";import WorkerIndex from"./worker.js";import Cache,{searchCache}from"./cache.js";import{is_string,is_object,parse_simple}from"./common.js";import apply_async from"./async.js";import{exportDocument,importDocument}from"./serialize.js";import{KeystoreMap,KeystoreSet}from"./keystore.js";import"./document/add.js";import"./document/search.js";export default function Document(a){if(!this)return new Document(a);const b=a.document||a.doc||a;let c,d;if(this.tree=[],this.field=[],this.marker=[],this.key=(c=b.key||b.id)&&parse_tree(c,this.marker)||"id",d=a.keystore||0,d&&(this.keystore=d),this.fastupdate=!!a.fastupdate,this.reg=this.fastupdate?d&&!0?new KeystoreMap(d):new Map:d&&!0?new KeystoreSet(d):new Set,this.storetree=(c=b.store||null)&&!0!==c&&[],this.store=c&&(d&&!0?new KeystoreMap(d):new Map),this.cache=(c=a.cache||null)&&new Cache(c),a.cache=!1,this.worker=a.worker,this.index=parse_descriptor.call(this,a,b),(this.tag=null,(c=b.tag)&&("string"==typeof c&&(c=[c]),c.length))){this.tag=new Map,this.tagtree=[],this.tagfield=[];for(let a,b,d=0;d<c.length;d++){if(a=c[d],b=a.field||a,!b)throw new Error("The tag field from the document descriptor is undefined.");a.custom?this.tagtree[d]=a.custom:(this.tagtree[d]=parse_tree(b,this.marker),a.filter&&("string"==typeof this.tagtree[d]&&(this.tagtree[d]=new String(this.tagtree[d])),this.tagtree[d]._filter=a.filter)),this.tagfield[d]=b,this.tag.set(b,new Map)}}a.db&&this.mount(a.db)}Document.prototype.mount=function(a){let b=this.field;if(this.tag)for(let a,c=0;c<this.tagfield.length;c++){a=this.tagfield[c];let d;this.index.set(a,d=new Index({},this.reg)),b===this.field&&(b=b.slice(0)),b.push(a),d.tag=this.tag.get(a)}const c=[],d={db:a.db,type:a.type,fastupdate:a.fastupdate};for(let e,f,g=0;g<b.length;g++){d.field=f=b[g],e=this.index.get(f);const h=new a.constructor(a.id,d);h.id=a.id,c[g]=h.mount(e),e.document=!0,g?e.bypass=!0:e.store=this.store}return this.db=!0,Promise.all(c)},Document.prototype.commit=async function(a,b){const c=[];for(const d of this.index.values())c.push(d.db.commit(d,a,b));await Promise.all(c),this.reg.clear()},Document.prototype.destroy=function(){const a=[];for(const b of this.index.values())a.push(b.destroy());return Promise.all(a)};function parse_descriptor(a,b){const c=new Map;let d=b.index||b.field||b;is_string(d)&&(d=[d]);for(let e,f,g=0;g<d.length;g++){if(e=d[g],is_string(e)||(f=e,e=e.field),f=is_object(f)?Object.assign({},a,f):a,this.worker){const a=new WorkerIndex(f);c.set(e,a),a.worker||(this.worker=!1)}this.worker||c.set(e,new Index(f,this.reg)),f.custom?this.tree[g]=f.custom:(this.tree[g]=parse_tree(e,this.marker),f.filter&&("string"==typeof this.tree[g]&&(this.tree[g]=new String(this.tree[g])),this.tree[g]._filter=f.filter)),this.field[g]=e}if(this.storetree){let a=b.store;is_string(a)&&(a=[a]);for(let b,c,d=0;d<a.length;d++)b=a[d],c=b.field||b,b.custom?(this.storetree[d]=b.custom,b.custom._field=c):(this.storetree[d]=parse_tree(c,this.marker),b.filter&&("string"==typeof this.storetree[d]&&(this.storetree[d]=new String(this.storetree[d])),this.storetree[d]._filter=b.filter))}return c}function parse_tree(a,b){const c=a.split(":");let d=0;for(let e=0;e<c.length;e++)a=c[e],"]"===a[a.length-1]&&(a=a.substring(0,a.length-2),a&&(b[d]=!0)),a&&(c[d++]=a);return d<c.length&&(c.length=d),1<d?c:c[0]}Document.prototype.append=function(a,b){return this.add(a,b,!0)},Document.prototype.update=function(a,b){return this.remove(a).add(a,b)},Document.prototype.remove=function(a){is_object(a)&&(a=parse_simple(a,this.key));for(const b of this.index.values())b.remove(a,!0);if(this.reg.has(a)){if(this.tag&&!this.fastupdate)for(let b of this.tag.values())for(let c of b){const d=c[0],e=c[1],f=e.indexOf(a);-1<f&&(1<e.length?e.splice(f,1):b.delete(d))}this.store&&this.store.delete(a),this.reg.delete(a)}return this.cache&&this.cache.remove(a),this},Document.prototype.clear=function(){for(const a of this.index.values())a.clear();if(this.tag)for(const a of this.tag.values())a.clear();return this.store&&this.store.clear(),this},Document.prototype.contain=function(a){return this.db?this.index.get(this.field[0]).db.has(a):this.reg.has(a)},Document.prototype.cleanup=function(){for(const a of this.index.values())a.cleanup();return this},Document.prototype.get=function(a){return this.db?this.index.get(this.field[0]).db.enrich(a).then(function(a){return a[0]&&a[0].doc}):this.store.get(a)},Document.prototype.set=function(a,b){return this.store.set(a,b),this},Document.prototype.searchCache=searchCache,Document.prototype.export=exportDocument,Document.prototype.import=importDocument,apply_async(Document.prototype);
\ No newline at end of file
+import{DocumentOptions,DocumentDescriptor,DocumentIndexOptions,StoreOptions}from"./type.js";import Index from"./index.js";import WorkerIndex from"./worker.js";import Cache,{searchCache}from"./cache.js";import{is_string,is_object,parse_simple}from"./common.js";import apply_async from"./async.js";import{exportDocument,importDocument}from"./serialize.js";import{KeystoreMap,KeystoreSet}from"./keystore.js";import"./document/add.js";import"./document/search.js";export default function Document(a){if(!this)return new Document(a);const b=a.document||a.doc||a;let c,d;if(this.tree=[],this.field=[],this.marker=[],this.key=(c=b.key||b.id)&&parse_tree(c,this.marker)||"id",d=a.keystore||0,d&&(this.keystore=d),this.fastupdate=!!a.fastupdate,this.reg=this.fastupdate?d&&!0?new KeystoreMap(d):new Map:d&&!0?new KeystoreSet(d):new Set,this.storetree=(c=b.store||null)&&!0!==c&&[],this.store=c&&(d&&!0?new KeystoreMap(d):new Map),this.cache=(c=a.cache||null)&&new Cache(c),a.cache=!1,this.worker=a.worker,this.index=parse_descriptor.call(this,a,b),(this.tag=null,(c=b.tag)&&("string"==typeof c&&(c=[c]),c.length))){this.tag=new Map,this.tagtree=[],this.tagfield=[];for(let a,b,d=0;d<c.length;d++){if(a=c[d],b=a.field||a,!b)throw new Error("The tag field from the document descriptor is undefined.");a.custom?this.tagtree[d]=a.custom:(this.tagtree[d]=parse_tree(b,this.marker),a.filter&&("string"==typeof this.tagtree[d]&&(this.tagtree[d]=new String(this.tagtree[d])),this.tagtree[d]._filter=a.filter)),this.tagfield[d]=b,this.tag.set(b,new Map)}}if(this.worker){const a=[];for(const b of this.index.values())b.worker.then&&a.push(b.worker);if(a.length){const b=this;return Promise.all(a).then(function(){return b})}}else a.db&&this.mount(a.db)}Document.prototype.mount=function(a){let b=this.field;if(this.tag)for(let a,c=0;c<this.tagfield.length;c++){a=this.tagfield[c];let d;this.index.set(a,d=new Index({},this.reg)),b===this.field&&(b=b.slice(0)),b.push(a),d.tag=this.tag.get(a)}const c=[],d={db:a.db,type:a.type,fastupdate:a.fastupdate};for(let e,f,g=0;g<b.length;g++){d.field=f=b[g],e=this.index.get(f);const h=new a.constructor(a.id,d);h.id=a.id,c[g]=h.mount(e),e.document=!0,g?e.bypass=!0:e.store=this.store}return this.db=!0,Promise.all(c)},Document.prototype.commit=async function(a,b){const c=[];for(const d of this.index.values())c.push(d.db.commit(d,a,b));await Promise.all(c),this.reg.clear()},Document.prototype.destroy=function(){const a=[];for(const b of this.index.values())a.push(b.destroy());return Promise.all(a)};function parse_descriptor(a,b){const c=new Map;let d=b.index||b.field||b;is_string(d)&&(d=[d]);for(let e,f,g=0;g<d.length;g++){if(e=d[g],is_string(e)||(f=e,e=e.field),f=is_object(f)?Object.assign({},a,f):a,this.worker){const a=new WorkerIndex(f);a.worker?c.set(e,a):this.worker=!1}this.worker||c.set(e,new Index(f,this.reg)),f.custom?this.tree[g]=f.custom:(this.tree[g]=parse_tree(e,this.marker),f.filter&&("string"==typeof this.tree[g]&&(this.tree[g]=new String(this.tree[g])),this.tree[g]._filter=f.filter)),this.field[g]=e}if(this.storetree){let a=b.store;is_string(a)&&(a=[a]);for(let b,c,d=0;d<a.length;d++)b=a[d],c=b.field||b,b.custom?(this.storetree[d]=b.custom,b.custom._field=c):(this.storetree[d]=parse_tree(c,this.marker),b.filter&&("string"==typeof this.storetree[d]&&(this.storetree[d]=new String(this.storetree[d])),this.storetree[d]._filter=b.filter))}return c}function parse_tree(a,b){const c=a.split(":");let d=0;for(let e=0;e<c.length;e++)a=c[e],"]"===a[a.length-1]&&(a=a.substring(0,a.length-2),a&&(b[d]=!0)),a&&(c[d++]=a);return d<c.length&&(c.length=d),1<d?c:c[0]}Document.prototype.append=function(a,b){return this.add(a,b,!0)},Document.prototype.update=function(a,b){return this.remove(a).add(a,b)},Document.prototype.remove=function(a){is_object(a)&&(a=parse_simple(a,this.key));for(const b of this.index.values())b.remove(a,!0);if(this.reg.has(a)){if(this.tag&&!this.fastupdate)for(let b of this.tag.values())for(let c of b){const d=c[0],e=c[1],f=e.indexOf(a);-1<f&&(1<e.length?e.splice(f,1):b.delete(d))}this.store&&this.store.delete(a),this.reg.delete(a)}return this.cache&&this.cache.remove(a),this},Document.prototype.clear=function(){for(const a of this.index.values())a.clear();if(this.tag)for(const a of this.tag.values())a.clear();return this.store&&this.store.clear(),this},Document.prototype.contain=function(a){return this.db?this.index.get(this.field[0]).db.has(a):this.reg.has(a)},Document.prototype.cleanup=function(){for(const a of this.index.values())a.cleanup();return this},Document.prototype.get=function(a){return this.db?this.index.get(this.field[0]).db.enrich(a).then(function(a){return a[0]&&a[0].doc}):this.store.get(a)},Document.prototype.set=function(a,b){return this.store.set(a,b),this},Document.prototype.searchCache=searchCache,Document.prototype.export=exportDocument,Document.prototype.import=importDocument,apply_async(Document.prototype);
\ No newline at end of file
diff --git a/dist/module-min/index.js b/dist/module-min/index.js
index 4bfea2e..9266d3e 100644
--- a/dist/module-min/index.js
+++ b/dist/module-min/index.js
@@ -1 +1 @@
-import{IndexOptions,ContextOptions}from"./type.js";import Encoder from"./encoder.js";import Cache,{searchCache}from"./cache.js";import Charset from"./charset.js";import{KeystoreMap,KeystoreSet}from"./keystore.js";import{is_array,is_string}from"./common.js";import{exportIndex,importIndex,serialize}from"./serialize.js";import default_encoder from"./charset/latin/default.js";import apply_preset from"./preset.js";import apply_async from"./async.js";import tick from"./profiler.js";import"./index/add.js";import"./index/search.js";import"./index/remove.js";export default function Index(a,b){if(!this)return new Index(a);!1,a=a?apply_preset(a):{};const c=a.context||{},d=a.encode||a.encoder||default_encoder;this.encoder=d.encode?d:"object"==typeof d?new Encoder(d):{encode:d},this.compress=a.compress||a.compression||!1;let e;this.resolution=a.resolution||9,this.tokenize=e=a.tokenize||"strict",this.depth="strict"===e&&c.depth||0,this.bidirectional=!1!==c.bidirectional,this.fastupdate=!!a.fastupdate,this.score=a.score||null,e=a.keystore||0,e&&(this.keystore=e),this.map=e&&!0?new KeystoreMap(e):new Map,this.ctx=e&&!0?new KeystoreMap(e):new Map,this.reg=b||(this.fastupdate?e&&!0?new KeystoreMap(e):new Map:e&&!0?new KeystoreSet(e):new Set),this.resolution_ctx=c.resolution||1,this.rtl=d.rtl||a.rtl||!1,this.cache=(e=a.cache||null)&&new Cache(e),this.resolve=!1!==a.resolve,(e=a.db)&&(this.db=e.mount(this)),this.commit_auto=!1!==a.commit,this.commit_task=[],this.commit_timer=null}Index.prototype.mount=function(a){return this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null),a.mount(this)},Index.prototype.commit=function(a,b){return this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null),this.db.commit(this,a,b)},Index.prototype.destroy=function(){return this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null),this.db.destroy()};export function autoCommit(a,b,c){a.commit_timer||(a.commit_timer=setTimeout(function(){a.commit_timer=null,a.db.commit(a,b,c)},0))}Index.prototype.clear=function(){return this.map.clear(),this.ctx.clear(),this.reg.clear(),this.cache&&this.cache.clear(),this.db&&(this.commit_timer&&clearTimeout(this.commit_timer),this.commit_timer=null,this.commit_task=[{clear:!0}]),this},Index.prototype.append=function(a,b){return this.add(a,b,!0)},Index.prototype.contain=function(a){return this.db?this.db.has(a):this.reg.has(a)},Index.prototype.update=function(a,b){const c=this,d=this.remove(a);return d&&d.then?d.then(()=>c.add(a,b)):this.add(a,b)};function cleanup_index(a){let b=0;if(is_array(a))for(let c,d=0;d<a.length;d++)(c=a[d])&&(b+=c.length);else for(const c of a){const d=c[0],e=c[1],f=cleanup_index(e);f?b+=f:a.delete(d)}return b}Index.prototype.cleanup=function(){return this.fastupdate?(cleanup_index(this.map),this.depth&&cleanup_index(this.ctx),this):(!1,this)},Index.prototype.searchCache=searchCache,Index.prototype.export=exportIndex,Index.prototype.import=importIndex,Index.prototype.serialize=serialize,apply_async(Index.prototype);
\ No newline at end of file
+import{IndexOptions,ContextOptions}from"./type.js";import Encoder from"./encoder.js";import Cache,{searchCache}from"./cache.js";import Charset from"./charset.js";import{KeystoreMap,KeystoreSet}from"./keystore.js";import{is_array,is_string}from"./common.js";import{exportIndex,importIndex,serialize}from"./serialize.js";import default_encoder from"./charset/latin/default.js";import apply_preset from"./preset.js";import apply_async from"./async.js";import tick from"./profiler.js";import"./index/add.js";import"./index/search.js";import"./index/remove.js";export default function Index(a,b){if(!this)return new Index(a);!1,a=a?apply_preset(a):{};const c=a.context||{},d=is_string(a.encoder)?Charset[a.encoder]:a.encode||a.encoder||default_encoder;this.encoder=d.encode?d:"object"==typeof d?new Encoder(d):{encode:d},this.compress=a.compress||a.compression||!1;let e;this.resolution=a.resolution||9,this.tokenize=e=a.tokenize||"strict",this.depth="strict"===e&&c.depth||0,this.bidirectional=!1!==c.bidirectional,this.fastupdate=!!a.fastupdate,this.score=a.score||null,e=a.keystore||0,e&&(this.keystore=e),this.map=e&&!0?new KeystoreMap(e):new Map,this.ctx=e&&!0?new KeystoreMap(e):new Map,this.reg=b||(this.fastupdate?e&&!0?new KeystoreMap(e):new Map:e&&!0?new KeystoreSet(e):new Set),this.resolution_ctx=c.resolution||1,this.rtl=d.rtl||a.rtl||!1,this.cache=(e=a.cache||null)&&new Cache(e),this.resolve=!1!==a.resolve,(e=a.db)&&(this.db=this.mount(e)),this.commit_auto=!1!==a.commit,this.commit_task=[],this.commit_timer=null}Index.prototype.mount=function(a){return this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null),a.mount(this)},Index.prototype.commit=function(a,b){return this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null),this.db.commit(this,a,b)},Index.prototype.destroy=function(){return this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null),this.db.destroy()};export function autoCommit(a,b,c){a.commit_timer||(a.commit_timer=setTimeout(function(){a.commit_timer=null,a.db.commit(a,b,c)},0))}Index.prototype.clear=function(){return this.map.clear(),this.ctx.clear(),this.reg.clear(),this.cache&&this.cache.clear(),this.db&&(this.commit_timer&&clearTimeout(this.commit_timer),this.commit_timer=null,this.commit_task=[{clear:!0}]),this},Index.prototype.append=function(a,b){return this.add(a,b,!0)},Index.prototype.contain=function(a){return this.db?this.db.has(a):this.reg.has(a)},Index.prototype.update=function(a,b){const c=this,d=this.remove(a);return d&&d.then?d.then(()=>c.add(a,b)):this.add(a,b)};function cleanup_index(a){let b=0;if(is_array(a))for(let c,d=0;d<a.length;d++)(c=a[d])&&(b+=c.length);else for(const c of a){const d=c[0],e=c[1],f=cleanup_index(e);f?b+=f:a.delete(d)}return b}Index.prototype.cleanup=function(){return this.fastupdate?(cleanup_index(this.map),this.depth&&cleanup_index(this.ctx),this):(!1,this)},Index.prototype.searchCache=searchCache,Index.prototype.export=exportIndex,Index.prototype.import=importIndex,Index.prototype.serialize=serialize,apply_async(Index.prototype);
\ No newline at end of file
diff --git a/dist/module-min/index/search.js b/dist/module-min/index/search.js
index 3499626..b84fa57 100644
--- a/dist/module-min/index/search.js
+++ b/dist/module-min/index/search.js
@@ -1 +1 @@
-import{SearchOptions}from"../type.js";import{create_object,is_object,sort_by_length_down}from"../common.js";import Index from"../index.js";import default_compress from"../compress.js";import Resolver from"../resolver.js";import{intersect}from"../intersect.js";import resolve_default from"../resolve/default.js";let global_resolve=1;export function set_resolve(a){global_resolve=a}Index.prototype.search=function(a,b,c){c||(!b&&is_object(a)?(c=a,a=""):is_object(b)&&(c=b,b=0));let d,e,f,g,h,i,j=[],k=0;if(c?(a=c.query||a,b=c.limit||b,k=c.offset||0,e=c.context,f=c.suggest,g=global_resolve&&!1!==c.resolve,g||(global_resolve=0),h=g&&c.enrich,i=this.db&&c.tag):g=this.resolve||global_resolve,a=this.encoder.encode(a),d=a.length,b||!g||(b=100),1===d)return single_term_query.call(this,a[0],"",b,k,g,h,i);if(e=this.depth&&!1!==e,2===d&&e&&!f)return single_term_query.call(this,a[0],a[1],b,k,g,h,i);let l=0,m=0;if(1<d){const b=create_object(),c=[];for(let e,h=0;h<d;h++)if(e=a[h],e&&!b[e]){if(!f&&!this.db&&!this.get_array(e))return g?j:new Resolver(j);c.push(e),b[e]=1;const a=e.length;l=Math.max(l,a),m=m?Math.min(m,a):a}a=c,d=a.length}if(!d)return g?j:new Resolver(j);let n,o=0;if(1===d)return single_term_query.call(this,a[0],"",b,k,g,h,i);if(2===d&&e&&!f)return single_term_query.call(this,a[0],a[1],b,k,g,h,i);if(1<d&&(e?(n=a[0],o=1):9<l&&3<l/m&&a.sort(sort_by_length_down)),this.db){if(this.db.search){const c=this.db.search(this,a,b,k,f,g,h,i);if(!1!==c)return c}const c=this;return async function(){for(let e,h;o<d;o++){if(h=a[o],n?(e=await c.get_array(h,n),e=add_result(e,j,f,c.resolution_ctx,b,k,2===d),(!f||!1!==e||!j.length)&&(n=h)):(e=await c.get_array(h),e=add_result(e,j,f,c.resolution,b,k,1===d)),e)return e;if(f&&o==d-1){let a=j.length;if(!a){if(n){n="",o=-1;continue}return j}if(1===a)return g?resolve_default(j[0],b,k):new Resolver(j[0])}}return g?intersect(j,c.resolution,b,k,f):new Resolver(j[0])}()}for(let e,h;o<d;o++){if(h=a[o],n?(e=this.get_array(h,n),e=add_result(e,j,f,this.resolution_ctx,b,k,2===d),(!f||!1!==e||!j.length)&&(n=h)):(e=this.get_array(h),e=add_result(e,j,f,this.resolution,b,k,1===d)),e)return e;if(f&&o==d-1){const a=j.length;if(!a){if(n){n="",o=-1;continue}return j}if(1===a)return g?resolve_default(j[0],b,k):new Resolver(j[0])}}return j=intersect(j,this.resolution,b,k,f),g?j:new Resolver(j)};function single_term_query(a,b,c,d,e,f,g){const h=this.get_array(a,b,c,d,e,f,g);return this.db?h.then(function(a){return e?a:a&&a.length?e?resolve_default(a,c,d):new Resolver(a):e?[]:new Resolver([])}):h&&h.length?e?resolve_default(h,c,d):new Resolver(h):e?[]:new Resolver([])}function add_result(a,b,c,d,e,f,g){let h=[];if(a){d=Math.min(a.length,d);for(let b,c=0,i=0;c<d&&!((b=a[c])&&(f&&b&&g&&(b.length<=f?(f-=b.length,b=null):(b=b.slice(f),f=0)),b&&(h[c]=b,g&&(i+=b.length,i>=e))));c++);if(h.length)return g?resolve_default(h,e,0):void b.push(h)}return!c&&h}Index.prototype.get_array=function(a,b,c,d,e,f,g){let h,i;return(b&&(i=this.bidirectional&&a>b),this.compress&&(a=default_compress(a),b&&(b=default_compress(b))),this.db)?b?this.db.get(i?b:a,i?a:b,c,d,e,f,g):this.db.get(a,"",c,d,e,f,g):(b?(h=this.ctx.get(i?a:b),h=h&&h.get(i?b:a)):h=this.map.get(a),h)};
\ No newline at end of file
+import{SearchOptions}from"../type.js";import{create_object,is_object,sort_by_length_down}from"../common.js";import Index from"../index.js";import default_compress from"../compress.js";import Resolver from"../resolver.js";import{intersect}from"../intersect.js";import resolve_default from"../resolve/default.js";let global_resolve=1;export function set_resolve(a){global_resolve=a}Index.prototype.search=function(a,b,c){c||(!b&&is_object(a)?(c=a,a=""):is_object(b)&&(c=b,b=0));let d,e,f,g,h,i,j=[],k=0;if(c?(a=c.query||a,b=c.limit||b,k=c.offset||0,e=c.context,f=c.suggest,g=global_resolve&&!1!==c.resolve,g||(global_resolve=0),h=g&&c.enrich,i=this.db&&c.tag):g=this.resolve||global_resolve,a=this.encoder.encode(a),d=a.length,b||!g||(b=100),1===d)return single_term_query.call(this,a[0],"",b,k,g,h,i);if(e=this.depth&&!1!==e,2===d&&e&&!f)return single_term_query.call(this,a[0],a[1],b,k,g,h,i);let l=0,m=0;if(1<d){const b=create_object(),c=[];for(let e,h=0;h<d;h++)if(e=a[h],e&&!b[e]){if(!f&&!this.db&&!this.get_array(e))return g?j:new Resolver(j);c.push(e),b[e]=1;const a=e.length;l=Math.max(l,a),m=m?Math.min(m,a):a}a=c,d=a.length}if(!d)return g?j:new Resolver(j);let n,o=0;if(1===d)return single_term_query.call(this,a[0],"",b,k,g,h,i);if(2===d&&e&&!f)return single_term_query.call(this,a[0],a[1],b,k,g,h,i);if(1<d&&(e?(n=a[0],o=1):9<l&&3<l/m&&a.sort(sort_by_length_down)),this.db){if(this.db.search){const c=this.db.search(this,a,b,k,f,g,h,i);if(!1!==c)return c}const c=this;return async function(){for(let e,h;o<d;o++){if(h=a[o],n?(e=await c.get_array(h,n,0,0,!1,!1),e=add_result(e,j,f,c.resolution_ctx),(!f||!1!==e||!j.length)&&(n=h)):(e=await c.get_array(h,"",0,0,!1,!1),e=add_result(e,j,f,c.resolution)),e)return e;if(f&&o==d-1){let a=j.length;if(!a){if(n){n="",o=-1;continue}return j}if(1===a)return g?resolve_default(j[0],b,k):new Resolver(j[0])}}return g?intersect(j,c.resolution,b,k,f):new Resolver(j[0])}()}for(let e,h;o<d;o++){if(h=a[o],n?(e=this.get_array(h,n,0,0,!1,!1),e=add_result(e,j,f,this.resolution_ctx),(!f||!1!==e||!j.length)&&(n=h)):(e=this.get_array(h,"",0,0,!1,!1),e=add_result(e,j,f,this.resolution)),e)return e;if(f&&o==d-1){const a=j.length;if(!a){if(n){n="",o=-1;continue}return j}if(1===a)return g?resolve_default(j[0],b,k):new Resolver(j[0])}}return j=intersect(j,this.resolution,b,k,f),g?j:new Resolver(j)};function single_term_query(a,b,c,d,e,f,g){const h=this.get_array(a,b,c,d,e,f,g);return this.db?h.then(function(a){return e?a:a&&a.length?e?resolve_default(a,c,d):new Resolver(a):e?[]:new Resolver([])}):h&&h.length?e?resolve_default(h,c,d):new Resolver(h):e?[]:new Resolver([])}function add_result(a,b,c,d){let e=[];if(a){d=Math.min(a.length,d);for(let b,c=0;c<d;c++)(b=a[c])&&b&&(e[c]=b);if(e.length)return void b.push(e)}return!c&&e}Index.prototype.get_array=function(a,b,c,d,e,f,g){let h,i;return(b&&(i=this.bidirectional&&a>b),this.compress&&(a=default_compress(a),b&&(b=default_compress(b))),this.db)?b?this.db.get(i?b:a,i?a:b,c,d,e,f,g):this.db.get(a,"",c,d,e,f,g):(b?(h=this.ctx.get(i?a:b),h=h&&h.get(i?b:a)):h=this.map.get(a),h)};
\ No newline at end of file
diff --git a/dist/module-min/type.js b/dist/module-min/type.js
index 48dc3f3..b3cc789 100644
--- a/dist/module-min/type.js
+++ b/dist/module-min/type.js
@@ -1 +1 @@
-import Encoder from"./encoder.js";import StorageInterface from"./db/interface.js";export let IndexOptions;export let DocumentIndexOptions;export let DocumentOptions;export let ContextOptions;export let DocumentDescriptor;export let TagOptions;export let StoreOptions;export let SearchOptions;export let DocumentSearchOptions;export let EncoderOptions;export let EncoderSplitOptions;export let PersistentOptions;
\ No newline at end of file
+import Encoder from"./encoder.js";import StorageInterface from"./db/interface.js";export let IndexOptions={};export let DocumentIndexOptions={};export let DocumentOptions={};export let ContextOptions={};export let DocumentDescriptor={};export let TagOptions={};export let StoreOptions={};export let SearchOptions={};export let DocumentSearchOptions={};export let EncoderOptions={};export let EncoderSplitOptions={};export let PersistentOptions={};
\ No newline at end of file
diff --git a/dist/module-min/webpack.js b/dist/module-min/webpack.js
index 2c795f3..7bf186f 100644
--- a/dist/module-min/webpack.js
+++ b/dist/module-min/webpack.js
@@ -1 +1 @@
-import{SearchOptions,ContextOptions,DocumentDescriptor,DocumentSearchOptions,DocumentIndexOptions,IndexOptions,DocumentOptions,TagOptions,StoreOptions,EncoderOptions,EncoderSplitOptions,PersistentOptions}from"./type.js";import StorageInterface from"./db/interface.js";import Document from"./document.js";import Index from"./index.js";import WorkerIndex from"./worker.js";import Resolver from"./resolver.js";import Encoder from"./encoder.js";import IdxDB from"./db/indexeddb/index.js";import Charset from"./charset.js";Index.prototype.add,Index.prototype.append,Index.prototype.search,Index.prototype.update,Index.prototype.remove,Index.prototype.contain,Index.prototype.clear,Index.prototype.cleanup,Index.prototype.searchCache,Index.prototype.addAsync,Index.prototype.appendAsync,Index.prototype.searchAsync,Index.prototype.updateAsync,Index.prototype.removeAsync,Index.prototype.export,Index.prototype.import,Index.prototype.serialize,Index.prototype.mount,Index.prototype.commit,Index.prototype.destroy,Index.prototype.reg,Index.prototype.map,Index.prototype.ctx,Index.prototype.db,Index.prototype.tag,Index.prototype.store,Index.prototype.depth,Index.prototype.bidirectional,Index.prototype.commit_task,Index.prototype.commit_timer,Index.prototype.cache,Index.prototype.bypass,Index.prototype.document,Document.prototype.add,Document.prototype.append,Document.prototype.search,Document.prototype.update,Document.prototype.remove,Document.prototype.contain,Document.prototype.clear,Document.prototype.cleanup,Document.prototype.addAsync,Document.prototype.appendAsync,Document.prototype.searchAsync,Document.prototype.updateAsync,Document.prototype.removeAsync,Document.prototype.mount,Document.prototype.commit,Document.prototype.destroy,Document.prototype.export,Document.prototype.import,Document.prototype.searchCache,Document.prototype.get,Document.prototype.set,Resolver.prototype.limit,Resolver.prototype.offset,Resolver.prototype.boost,Resolver.prototype.resolve,Resolver.prototype.or,Resolver.prototype.and,Resolver.prototype.xor,Resolver.prototype.not,StorageInterface.db,StorageInterface.id,StorageInterface.support_tag_search,StorageInterface.prototype.mount,StorageInterface.prototype.open,StorageInterface.prototype.close,StorageInterface.prototype.destroy,StorageInterface.prototype.clear,StorageInterface.prototype.get,StorageInterface.prototype.tag,StorageInterface.prototype.enrich,StorageInterface.prototype.has,StorageInterface.prototype.search,StorageInterface.prototype.info,StorageInterface.prototype.commit,StorageInterface.prototype.remove,Charset.LatinExact,Charset.LatinDefault,Charset.LatinSimple,Charset.LatinBalance,Charset.LatinAdvanced,Charset.LatinExtra,Charset.LatinSoundex,Charset.ArabicDefault,Charset.CjkDefault,Charset.CyrillicDefault,IndexOptions.preset,IndexOptions.context,IndexOptions.encoder,IndexOptions.encode,IndexOptions.resolution,IndexOptions.tokenize,IndexOptions.fastupdate,IndexOptions.score,IndexOptions.keystore,IndexOptions.rtl,IndexOptions.cache,IndexOptions.resolve,IndexOptions.db,IndexOptions.config,DocumentIndexOptions.preset,DocumentIndexOptions.context,DocumentIndexOptions.encoder,DocumentIndexOptions.encode,DocumentIndexOptions.resolution,DocumentIndexOptions.tokenize,DocumentIndexOptions.fastupdate,DocumentIndexOptions.score,DocumentIndexOptions.keystore,DocumentIndexOptions.rtl,DocumentIndexOptions.cache,DocumentIndexOptions.db,DocumentIndexOptions.config,DocumentIndexOptions.field,DocumentIndexOptions.filter,DocumentIndexOptions.custom,DocumentOptions.context,DocumentOptions.encoder,DocumentOptions.encode,DocumentOptions.resolution,DocumentOptions.tokenize,DocumentOptions.fastupdate,DocumentOptions.score,DocumentOptions.keystore,DocumentOptions.rtl,DocumentOptions.cache,DocumentOptions.db,DocumentOptions.doc,DocumentOptions.document,DocumentOptions.worker,ContextOptions.depth,ContextOptions.bidirectional,ContextOptions.resolution,DocumentDescriptor.field,DocumentDescriptor.index,DocumentDescriptor.tag,DocumentDescriptor.store,TagOptions.field,TagOptions.tag,TagOptions.filter,TagOptions.custom,TagOptions.keystore,TagOptions.db,TagOptions.config,StoreOptions.field,StoreOptions.filter,StoreOptions.custom,StoreOptions.config,SearchOptions.query,SearchOptions.limit,SearchOptions.offset,SearchOptions.context,SearchOptions.suggest,SearchOptions.resolve,SearchOptions.enrich,DocumentSearchOptions.query,DocumentSearchOptions.limit,DocumentSearchOptions.offset,DocumentSearchOptions.context,DocumentSearchOptions.suggest,DocumentSearchOptions.enrich,DocumentSearchOptions.tag,DocumentSearchOptions.field,DocumentSearchOptions.index,DocumentSearchOptions.pluck,DocumentSearchOptions.merge,EncoderOptions.rtl,EncoderOptions.dedupe,EncoderOptions.split,EncoderOptions.include,EncoderOptions.exclude,EncoderOptions.prepare,EncoderOptions.finalize,EncoderOptions.filter,EncoderOptions.matcher,EncoderOptions.mapper,EncoderOptions.stemmer,EncoderOptions.replacer,EncoderOptions.minlength,EncoderOptions.maxlength,EncoderOptions.cache,EncoderSplitOptions.letter,EncoderSplitOptions.number,EncoderSplitOptions.symbol,EncoderSplitOptions.punctuation,EncoderSplitOptions.control,EncoderSplitOptions.char,PersistentOptions.name,PersistentOptions.field,PersistentOptions.type,PersistentOptions.db;const FlexSearch={Index:Index,Charset:Charset,Encoder:Encoder,Document:Document,Worker:WorkerIndex,Resolver:Resolver,IndexedDB:IdxDB,Language:{}};{FlexSearch.Language={};const a=self;let b;(b=a.define)&&b.amd?b([],function(){return FlexSearch}):"object"==typeof a.exports?a.exports=FlexSearch:a.FlexSearch=FlexSearch}
\ No newline at end of file
+import{SearchOptions,ContextOptions,DocumentDescriptor,DocumentSearchOptions,DocumentIndexOptions,IndexOptions,DocumentOptions,TagOptions,StoreOptions,EncoderOptions,EncoderSplitOptions,PersistentOptions}from"./type.js";import StorageInterface from"./db/interface.js";import Document from"./document.js";import Index from"./index.js";import WorkerIndex from"./worker.js";import Resolver from"./resolver.js";import Encoder from"./encoder.js";import IdxDB from"./db/indexeddb/index.js";import Charset from"./charset.js";Index.prototype.add,Index.prototype.append,Index.prototype.search,Index.prototype.update,Index.prototype.remove,Index.prototype.contain,Index.prototype.clear,Index.prototype.cleanup,Index.prototype.searchCache,Index.prototype.addAsync,Index.prototype.appendAsync,Index.prototype.searchAsync,Index.prototype.updateAsync,Index.prototype.removeAsync,Index.prototype.export,Index.prototype.import,Index.prototype.serialize,Index.prototype.mount,Index.prototype.commit,Index.prototype.destroy,Index.prototype.reg,Index.prototype.map,Index.prototype.ctx,Index.prototype.db,Index.prototype.tag,Index.prototype.store,Index.prototype.depth,Index.prototype.bidirectional,Index.prototype.commit_task,Index.prototype.commit_timer,Index.prototype.cache,Index.prototype.bypass,Index.prototype.document,Index.prototype.encoder,Document.prototype.add,Document.prototype.append,Document.prototype.search,Document.prototype.update,Document.prototype.remove,Document.prototype.contain,Document.prototype.clear,Document.prototype.cleanup,Document.prototype.addAsync,Document.prototype.appendAsync,Document.prototype.searchAsync,Document.prototype.updateAsync,Document.prototype.removeAsync,Document.prototype.mount,Document.prototype.commit,Document.prototype.destroy,Document.prototype.export,Document.prototype.import,Document.prototype.searchCache,Document.prototype.get,Document.prototype.set,Resolver.prototype.limit,Resolver.prototype.offset,Resolver.prototype.boost,Resolver.prototype.resolve,Resolver.prototype.or,Resolver.prototype.and,Resolver.prototype.xor,Resolver.prototype.not,StorageInterface.db,StorageInterface.id,StorageInterface.support_tag_search,StorageInterface.prototype.mount,StorageInterface.prototype.open,StorageInterface.prototype.close,StorageInterface.prototype.destroy,StorageInterface.prototype.clear,StorageInterface.prototype.get,StorageInterface.prototype.tag,StorageInterface.prototype.enrich,StorageInterface.prototype.has,StorageInterface.prototype.search,StorageInterface.prototype.info,StorageInterface.prototype.commit,StorageInterface.prototype.remove,Charset.LatinExact,Charset.LatinDefault,Charset.LatinSimple,Charset.LatinBalance,Charset.LatinAdvanced,Charset.LatinExtra,Charset.LatinSoundex,Charset.ArabicDefault,Charset.CjkDefault,Charset.CyrillicDefault,IndexOptions.preset,IndexOptions.context,IndexOptions.encoder,IndexOptions.encode,IndexOptions.resolution,IndexOptions.tokenize,IndexOptions.fastupdate,IndexOptions.score,IndexOptions.keystore,IndexOptions.rtl,IndexOptions.cache,IndexOptions.resolve,IndexOptions.db,IndexOptions.config,DocumentIndexOptions.preset,DocumentIndexOptions.context,DocumentIndexOptions.encoder,DocumentIndexOptions.encode,DocumentIndexOptions.resolution,DocumentIndexOptions.tokenize,DocumentIndexOptions.fastupdate,DocumentIndexOptions.score,DocumentIndexOptions.keystore,DocumentIndexOptions.rtl,DocumentIndexOptions.cache,DocumentIndexOptions.db,DocumentIndexOptions.config,DocumentIndexOptions.field,DocumentIndexOptions.filter,DocumentIndexOptions.custom,DocumentOptions.context,DocumentOptions.encoder,DocumentOptions.encode,DocumentOptions.resolution,DocumentOptions.tokenize,DocumentOptions.fastupdate,DocumentOptions.score,DocumentOptions.keystore,DocumentOptions.rtl,DocumentOptions.cache,DocumentOptions.db,DocumentOptions.doc,DocumentOptions.document,DocumentOptions.worker,ContextOptions.depth,ContextOptions.bidirectional,ContextOptions.resolution,DocumentDescriptor.field,DocumentDescriptor.index,DocumentDescriptor.tag,DocumentDescriptor.store,TagOptions.field,TagOptions.tag,TagOptions.filter,TagOptions.custom,TagOptions.keystore,TagOptions.db,TagOptions.config,StoreOptions.field,StoreOptions.filter,StoreOptions.custom,StoreOptions.config,SearchOptions.query,SearchOptions.limit,SearchOptions.offset,SearchOptions.context,SearchOptions.suggest,SearchOptions.resolve,SearchOptions.enrich,DocumentSearchOptions.query,DocumentSearchOptions.limit,DocumentSearchOptions.offset,DocumentSearchOptions.context,DocumentSearchOptions.suggest,DocumentSearchOptions.enrich,DocumentSearchOptions.tag,DocumentSearchOptions.field,DocumentSearchOptions.index,DocumentSearchOptions.pluck,DocumentSearchOptions.merge,EncoderOptions.rtl,EncoderOptions.dedupe,EncoderOptions.split,EncoderOptions.include,EncoderOptions.exclude,EncoderOptions.prepare,EncoderOptions.finalize,EncoderOptions.filter,EncoderOptions.matcher,EncoderOptions.mapper,EncoderOptions.stemmer,EncoderOptions.replacer,EncoderOptions.minlength,EncoderOptions.maxlength,EncoderOptions.cache,EncoderSplitOptions.letter,EncoderSplitOptions.number,EncoderSplitOptions.symbol,EncoderSplitOptions.punctuation,EncoderSplitOptions.control,EncoderSplitOptions.char,PersistentOptions.name,PersistentOptions.field,PersistentOptions.type,PersistentOptions.db;const FlexSearch={Index:Index,Charset:Charset,Encoder:Encoder,Document:Document,Worker:WorkerIndex,Resolver:Resolver,IndexedDB:IdxDB,Language:{}};{FlexSearch.Language={};const a=self;let b;(b=a.define)&&b.amd?b([],function(){return FlexSearch}):"object"==typeof a.exports?a.exports=FlexSearch:a.FlexSearch=FlexSearch}
\ No newline at end of file
diff --git a/dist/module-min/worker.js b/dist/module-min/worker.js
index cef2831..77f6139 100644
--- a/dist/module-min/worker.js
+++ b/dist/module-min/worker.js
@@ -1 +1 @@
-import{IndexOptions}from"./type.js";import{create_object,is_function,is_object,is_string}from"./common.js";import handler from"./worker/handler.js";let pid=0;export default function WorkerIndex(a){if(!this)return new WorkerIndex(a);a||(a={});let b="undefined"!=typeof self&&(self||window)._factory;b&&(b=b.toString());const c="undefined"==typeof window,d=this;(async function(){function e(a){a=a.data||a;const b=a.id,c=b&&d.resolver[b];c&&(c(a.msg),delete d.resolver[b])}if(this.worker=await create(b,c,a.worker),this.resolver=create_object(),!!this.worker)return c?this.worker.on("message",e):this.worker.onmessage=e,a.config?(delete a.db,new Promise(function(c){d.resolver[++pid]=function(){c(d)},d.worker.postMessage({id:pid,task:"init",factory:b,options:a})})):void this.worker.postMessage({task:"init",factory:b,options:a})}).call(this)}register("add"),register("append"),register("search"),register("update"),register("remove");function register(a){WorkerIndex.prototype[a]=WorkerIndex.prototype[a+"Async"]=function(){const b=this,c=[].slice.call(arguments),d=c[c.length-1];let e;is_function(d)&&(e=d,c.splice(c.length-1,1));const f=new Promise(function(d){b.resolver[++pid]=d,b.worker.postMessage({task:a,id:pid,args:c})});return e?(f.then(e),this):f}}async function create(a,b,c){let d;return d=b?"undefined"==typeof module?(0,eval)("new ((await import(\"worker_threads\"))[\"Worker\"])((1,eval)(\"import.meta.dirname\") + \"/node/node.mjs\")"):(0,eval)("new (require(\"worker_threads\")[\"Worker\"])(__dirname + \"/node/node.js\")"):a?new window.Worker(URL.createObjectURL(new Blob(["onmessage="+handler.toString()],{type:"text/javascript"}))):new window.Worker(is_string(c)?c:"worker/worker.js",{type:"module"}),d}
\ No newline at end of file
+import{IndexOptions}from"./type.js";import{create_object,is_function,is_object,is_string}from"./common.js";import handler from"./worker/handler.js";let pid=0;export default function WorkerIndex(a={}){function b(f){function g(a){a=a.data||a;const b=a.id,c=b&&e.resolver[b];c&&(c(a.msg),delete e.resolver[b])}return(this.worker=f||create(c,d,a.worker),this.worker.then)?this.worker.then(b):(this.resolver=create_object(),!!this.worker)?(d?this.worker.on("message",g):this.worker.onmessage=g,a.config)?new Promise(function(b){e.resolver[++pid]=function(){b(e)},e.worker.postMessage({id:pid,task:"init",factory:c,options:a})}):(this.worker.postMessage({task:"init",factory:c,options:a}),this.worker):void 0}if(!this)return new WorkerIndex(a);let c="undefined"==typeof self?"undefined"==typeof window?null:window._factory:self._factory;c&&(c=c.toString());const d="undefined"==typeof window,e=this;this.worker=b.call(this)}register("add"),register("append"),register("search"),register("update"),register("remove");function register(a){WorkerIndex.prototype[a]=WorkerIndex.prototype[a+"Async"]=async function(){const b=this,c=[].slice.call(arguments),d=c[c.length-1];let e;is_function(d)&&(e=d,c.splice(c.length-1,1));const f=new Promise(function(d){b.resolver[++pid]=d,b.worker.postMessage({task:a,id:pid,args:c})});return e?(f.then(e),this):f}}function create(a,b,c){let d;return d=b?"undefined"==typeof module?(0,eval)("import(\"worker_threads\").then(function(worker){ return new worker[\"Worker\"]((1,eval)(\"import.meta.dirname\") + \"/node/node.mjs\"); })"):(0,eval)("new (require(\"worker_threads\")[\"Worker\"])(__dirname + \"/node/node.js\")"):a?new window.Worker(URL.createObjectURL(new Blob(["onmessage="+handler.toString()],{type:"text/javascript"}))):new window.Worker(is_string(c)?c:"worker/worker.js",{type:"module"}),d}
\ No newline at end of file
diff --git a/dist/module-min/worker/node.js b/dist/module-min/worker/node.js
index 4ca47bb..43d61e6 100644
--- a/dist/module-min/worker/node.js
+++ b/dist/module-min/worker/node.js
@@ -1 +1 @@
-const{parentPort}=require("worker_threads"),{join}=require("path"),{Index}=require("../flexsearch.bundle.min.js");let index;parentPort.on("message",function(a){const b=a.args,c=a.task,d=a.id;switch(c){case"init":let e=a.options||{},f=e.config;f&&(e=require(f)),index=new Index(e);break;default:const g=index[c].apply(index,b);parentPort.postMessage("search"===c?{id:d,msg:g}:{id:d});}});
\ No newline at end of file
+const{parentPort}=require("worker_threads"),{join}=require("path"),{Index}=require("../flexsearch.bundle.min.js");let index;parentPort.on("message",async function(a){const b=a.args,c=a.task,d=a.id;switch(c){case"init":let e=a.options||{},f=e.config;f&&(e=Object.assign({},e,require(f)),delete e.worker),index=new Index(e),parentPort.postMessage({id:d});break;default:const g=index[c].apply(index,b);parentPort.postMessage("search"===c?{id:d,msg:g}:{id:d});}});
\ No newline at end of file
diff --git a/dist/module/db/indexeddb/index.js b/dist/module/db/indexeddb/index.js
index 5dfdc45..2fc8a26 100644
--- a/dist/module/db/indexeddb/index.js
+++ b/dist/module/db/indexeddb/index.js
@@ -139,6 +139,7 @@ IdxDB.prototype.clear = function () {
 };
 
 IdxDB.prototype.get = function (key, ctx, limit = 0, offset = 0, resolve = /* tag? */!0, enrich = !1) {
+    console.log("!!!!!!!!!!!");
     const transaction = this.db.transaction(ctx ? "ctx" : "map", "readonly"),
           map = transaction.objectStore(ctx ? "ctx" : "map"),
           req = map.get(ctx ? ctx + ":" + key : key),
diff --git a/dist/module/db/postgres/index.js b/dist/module/db/postgres/index.js
index 134be98..6ff096d 100644
--- a/dist/module/db/postgres/index.js
+++ b/dist/module/db/postgres/index.js
@@ -63,7 +63,8 @@ export default function PostgresDB(name, config = {}) {
     this.id = (config.schema ? sanitize(config.schema) : defaults.schema) + (name ? "_" + sanitize(name) : "");
     this.field = config.field ? "_" + sanitize(config.field) : "";
     this.type = config.type ? types[config.type.toLowerCase()] : "text";
-    this.support_tag_search = /* tag? */!0 /*await rows.hasNext()*/ /*await rows.hasNext()*/ /*await rows.hasNext()*/;
+    this.support_tag_search =
+    /* tag? */!0 /*await rows.hasNext()*/ /*await rows.hasNext()*/ /*await rows.hasNext()*/;
     if (!this.type) throw new Error("Unknown type of ID '" + config.type + "'");
     this.db = DB || (DB = config.db || null);
     Object.assign(defaults, config);
diff --git a/dist/module/document.js b/dist/module/document.js
index 877f3a7..e991f2a 100644
--- a/dist/module/document.js
+++ b/dist/module/document.js
@@ -49,7 +49,8 @@ export default function Document(options) {
     this.cache = (tmp = options.cache || null) && new Cache(tmp);
     // do not apply cache again for the indexes since .searchCache()
     // is just a wrapper over .search()
-    options.cache = /* suggest */ /* append: */ /* enrich */!1;
+    options.cache = /* suggest */ /* append: */
+    /* enrich */!1;
 
     this.worker = options.worker;
 
@@ -99,7 +100,21 @@ export default function Document(options) {
         }
     }
 
-    options.db && this.mount(options.db);
+
+    if (this.worker) {
+        const promises = [];
+        for (const index of this.index.values()) {
+            index.worker.then && promises.push(index.worker);
+        }
+        if (promises.length) {
+            const self = this;
+            return Promise.all(promises).then(function () {
+                return self;
+            });
+        }
+    } else {
+        options.db && this.mount(options.db);
+    }
 }
 
 Document.prototype.mount = function (db) {
@@ -209,8 +224,9 @@ function parse_descriptor(options, document) {
 
         if (this.worker) {
             const worker = new WorkerIndex(opt);
-            index.set(key, worker);
-            if (!worker.worker) {
+            if (worker.worker) {
+                index.set(key, worker);
+            } else {
                 // fallback when not supported
                 this.worker = !1;
             }
diff --git a/dist/module/index.js b/dist/module/index.js
index 77c34e2..f9eb412 100644
--- a/dist/module/index.js
+++ b/dist/module/index.js
@@ -37,7 +37,7 @@ export default function Index(options, _register) {
 
     /** @type ContextOptions */
     const context = options.context || {},
-          encoder = options.encode || options.encoder || default_encoder;
+          encoder = is_string(options.encoder) ? Charset[options.encoder] : options.encode || options.encoder || default_encoder;
 
     /** @type Encoder */
     this.encoder = encoder.encode ? encoder : "object" == typeof encoder ? new Encoder(encoder) : { encode: encoder };
@@ -67,7 +67,7 @@ export default function Index(options, _register) {
     this.resolve = !1 !== options.resolve;
 
     if (tmp = options.db) {
-        this.db = tmp.mount(this);
+        this.db = this.mount(tmp);
     }
     this.commit_auto = !1 !== options.commit;
     this.commit_task = [];
diff --git a/dist/module/index/search.js b/dist/module/index/search.js
index 29b3422..d42576f 100644
--- a/dist/module/index/search.js
+++ b/dist/module/index/search.js
@@ -173,6 +173,8 @@ Index.prototype.search = function (query, limit, options) {
             }
     }
 
+    // from this point there are just multi-term queries
+
     if (this.db) {
 
         if (this.db.search) {
@@ -190,10 +192,12 @@ Index.prototype.search = function (query, limit, options) {
 
                 if (keyword) {
 
-                    arr = await self.get_array(term, keyword);
-                    arr = add_result(arr, result, suggest, self.resolution_ctx,
-                    /** @type {!number} */limit, offset, 2 === length
-                    /*, term, keyword*/
+                    arr = await self.get_array(term, keyword, 0, 0, !1, !1);
+                    arr = add_result(arr, result, suggest, self.resolution_ctx
+                    // 0, // /** @type {!number} */ (limit),
+                    // 0, // offset,
+                    // length === 2
+                    // /*, term, keyword*/
                     );
 
                     // the context is a moving window where the keyword is going forward like a cursor
@@ -204,10 +208,12 @@ Index.prototype.search = function (query, limit, options) {
                     }
                 } else {
 
-                    arr = await self.get_array(term);
-                    arr = add_result(arr, result, suggest, self.resolution,
-                    /** @type {!number} */limit, offset, 1 === length
-                    /*, term*/
+                    arr = await self.get_array(term, "", 0, 0, !1, !1);
+                    arr = add_result(arr, result, suggest, self.resolution
+                    // 0, // /** @type {!number} */ (limit),
+                    // 0, // offset,
+                    // length === 1
+                    // /*, term*/
                     );
                 }
 
@@ -243,10 +249,12 @@ Index.prototype.search = function (query, limit, options) {
 
         if (keyword) {
 
-            arr = this.get_array(term, keyword);
-            arr = /*this.*/add_result(arr, result, suggest, this.resolution_ctx,
-            /** @type {!number} */limit, offset, 2 === length
-            /*, term, keyword*/
+            arr = this.get_array(term, keyword, 0, 0, !1, !1);
+            arr = /*this.*/add_result(arr, result, suggest, this.resolution_ctx
+            // 0, // /** @type {!number} */ (limit),
+            // 0, // offset,
+            // length === 2
+            // /*, term, keyword*/
             );
 
             // 1. when suggestion enabled just forward keyword if term was found
@@ -256,10 +264,12 @@ Index.prototype.search = function (query, limit, options) {
             }
         } else {
 
-            arr = this.get_array(term);
-            arr = /*this.*/add_result(arr, result, suggest, this.resolution,
-            /** @type {!number} */limit, offset, 1 === length
-            /*, term*/
+            arr = this.get_array(term, "", 0, 0, !1, !1);
+            arr = /*this.*/add_result(arr, result, suggest, this.resolution
+            // 0, // /** @type {!number} */ (limit),
+            // 0, // offset,
+            // length === 1
+            // /*, term*/
             );
         }
 
@@ -327,13 +337,10 @@ function single_term_query(term, keyword, limit, offset, resolve, enrich, tag) {
  * @param {Array} result
  * @param {Array} suggest
  * @param {number} resolution
- * @param {number} limit
- * @param {number} offset
- * @param {boolean} single_term
  * @return {Array|boolean|undefined}
  */
 
-function add_result(arr, result, suggest, resolution, limit, offset, single_term /*, term, keyword*/) {
+function add_result(arr, result, suggest, resolution /*, limit, offset single_term, term, keyword*/) {
 
     let word_arr = [];
     //let arr;// = keyword ? this.ctx : this.map;
@@ -345,21 +352,22 @@ function add_result(arr, result, suggest, resolution, limit, offset, single_term
         // apply reduced resolution for queries
         resolution = Math.min(arr.length, resolution);
 
-        for (let x = 0, size = 0, tmp; x < resolution; x++) {
+        for (let x = 0, tmp; x < resolution; x++) {
             if (tmp = arr[x]) {
 
-                if (offset) {
-                    // apply offset right here on single terms
-                    if (tmp && single_term) {
-                        if (tmp.length <= offset) {
-                            offset -= tmp.length;
-                            tmp = null;
-                        } else {
-                            tmp = tmp.slice(offset);
-                            offset = 0;
-                        }
-                    }
-                }
+                // if(offset){
+                //     // apply offset right here on single terms
+                //     if(tmp && single_term){
+                //         if(tmp.length <= offset){
+                //             offset -= tmp.length;
+                //             tmp = null;
+                //         }
+                //         else{
+                //             tmp = tmp.slice(offset);
+                //             offset = 0;
+                //         }
+                //     }
+                // }
 
                 if (tmp) {
 
@@ -368,25 +376,25 @@ function add_result(arr, result, suggest, resolution, limit, offset, single_term
                     // simplified score order:
                     //word_arr.push(tmp);
 
-                    if (single_term) {
-                        size += tmp.length;
-                        if (size >= limit) {
-                            // fast path:
-                            // a single term does not need to pre-collect results
-                            break;
-                        }
-                    }
+                    // if(single_term){
+                    //     size += tmp.length;
+                    //     if(size >= limit){
+                    //         // fast path:
+                    //         // a single term does not need to pre-collect results
+                    //         break;
+                    //     }
+                    // }
                 }
             }
         }
 
         if (word_arr.length) {
-            if (single_term) {
-                // fast path optimization
-                // offset was already applied at this point
-                // return an array will stop the query process immediately
-                return resolve_default(word_arr, limit, 0);
-            }
+            // if(single_term){
+            //     // fast path optimization
+            //     // offset was already applied at this point
+            //     // return an array will stop the query process immediately
+            //     return resolve_default(word_arr, limit, 0);
+            // }
 
             result.push(word_arr);
             // return nothing will continue the query
diff --git a/dist/module/type.js b/dist/module/type.js
index 2e43ec3..24d1aa9 100644
--- a/dist/module/type.js
+++ b/dist/module/type.js
@@ -19,10 +19,11 @@ import StorageInterface from "./db/interface.js";
  *   resolve: [boolean=true],
  *   db: StorageInterface|undefined,
  *   commit: boolean=true,
+ *   worker: boolean|string|undefined,
  *   config: string|undefined
  * }}
  */
-export let IndexOptions;
+export let IndexOptions = {};
 
 /**
  * @typedef DocumentIndexOptions {{
@@ -40,13 +41,12 @@ export let IndexOptions;
  *   db: StorageInterface|undefined,
  *   commit: boolean=true,
  *   config: string|undefined,
- *
  *   field: string,
  *   filter: Function|undefined,
  *   custom: Function|undefined
  * }}
  */
-export let DocumentIndexOptions;
+export let DocumentIndexOptions = {};
 
 /**
  * @typedef DocumentOptions {{
@@ -66,7 +66,7 @@ export let DocumentIndexOptions;
  *   worker: boolean|string|undefined
  * }}
  */
-export let DocumentOptions;
+export let DocumentOptions = {};
 
 /**
  * @typedef ContextOptions {{
@@ -75,7 +75,7 @@ export let DocumentOptions;
  *   resolution: number|undefined
  * }}
  */
-export let ContextOptions;
+export let ContextOptions = {};
 
 /**
  * @typedef DocumentDescriptor {{
@@ -86,7 +86,7 @@ export let ContextOptions;
  *   store: StoreOptions|Array<StoreOptions>|undefined
  * }}
  */
-export let DocumentDescriptor;
+export let DocumentDescriptor = {};
 
 /**
  * @typedef TagOptions {{
@@ -99,7 +99,7 @@ export let DocumentDescriptor;
  *   config: string|undefined
  * }}
  */
-export let TagOptions;
+export let TagOptions = {};
 
 /**
  * @typedef StoreOptions {{
@@ -109,7 +109,7 @@ export let TagOptions;
  *   config: string|undefined
  * }}
  */
-export let StoreOptions;
+export let StoreOptions = {};
 
 /**
  * @typedef SearchOptions {{
@@ -122,7 +122,7 @@ export let StoreOptions;
  *   enrich: [boolean=false],
  * }}
  */
-export let SearchOptions;
+export let SearchOptions = {};
 // tag: Array|undefined
 
 /**
@@ -140,7 +140,7 @@ export let SearchOptions;
  *   merge: [boolean=false]
  * }}
  */
-export let DocumentSearchOptions;
+export let DocumentSearchOptions = {};
 
 /**
  * @typedef EncoderOptions {{
@@ -161,7 +161,7 @@ export let DocumentSearchOptions;
  *   cache: boolean=true,
  * }}
  */
-export let EncoderOptions;
+export let EncoderOptions = {};
 
 /**
  * @typedef EncoderSplitOptions {{
@@ -173,7 +173,7 @@ export let EncoderOptions;
  *   char: string|Array<string>|undefined,
  * }}
  */
-export let EncoderSplitOptions;
+export let EncoderSplitOptions = {};
 
 /**
  * @typedef PersistentOptions {{
@@ -183,4 +183,4 @@ export let EncoderSplitOptions;
  *   db: *|undefined
  * }}
  */
-export let PersistentOptions;
\ No newline at end of file
+export let PersistentOptions = {};
\ No newline at end of file
diff --git a/dist/module/webpack.js b/dist/module/webpack.js
index 128e45a..e3f9974 100644
--- a/dist/module/webpack.js
+++ b/dist/module/webpack.js
@@ -44,6 +44,7 @@ import Charset from "./charset.js";
 /** @export */Index.prototype.cache;
 /** @export */Index.prototype.bypass;
 /** @export */Index.prototype.document;
+/** @export */Index.prototype.encoder;
 
 /** @export */Document.prototype.add;
 /** @export */Document.prototype.append;
diff --git a/dist/module/worker.js b/dist/module/worker.js
index 97189d3..4079eb6 100644
--- a/dist/module/worker.js
+++ b/dist/module/worker.js
@@ -1,4 +1,3 @@
-//import { promise as Promise } from "../polyfill.js";
 import { IndexOptions } from "./type.js";
 import { create_object, is_function, is_object, is_string } from "./common.js";
 import handler from "./worker/handler.js";
@@ -10,20 +9,15 @@ let pid = 0;
  * @constructor
  */
 
-export default function WorkerIndex(options) {
+export default function WorkerIndex(options = {}) {
 
     if (!this) {
         return new WorkerIndex(options);
     }
 
-    if (!options) {
-        options = {};
-    }
-
     // the factory is the outer wrapper from the build
-    // we use "self" as a trap for node.js
-
-    let factory = "undefined" != typeof self && (self || window)._factory;
+    // it uses "self" as a trap for node.js
+    let factory = "undefined" != typeof self ? self._factory : "undefined" != typeof window ? window._factory : null;
     if (factory) {
         factory = factory.toString();
     }
@@ -31,9 +25,18 @@ export default function WorkerIndex(options) {
     const is_node_js = "undefined" == typeof window /*&& self["exports"]*/,
           _self = this;
 
-    (async function () {
+    /**
+     * @param {Worker=} _worker
+     * @this {WorkerIndex}
+     */
+    function init(_worker) {
+
+        this.worker = _worker || create(factory, is_node_js, options.worker);
+
+        if (this.worker.then) {
+            return this.worker.then(init);
+        }
 
-        this.worker = await create(factory, is_node_js, options.worker);
         this.resolver = create_object();
 
         if (!this.worker) {
@@ -55,14 +58,16 @@ export default function WorkerIndex(options) {
 
         if (options.config) {
 
-            delete options.db;
+            //delete options.db;
 
             // when extern configuration needs to be loaded
             // it needs to return a promise to await for
             return new Promise(function (resolve) {
+
                 _self.resolver[++pid] = function () {
                     resolve(_self);
                 };
+
                 _self.worker.postMessage({
                     id: pid,
                     task: "init",
@@ -77,7 +82,11 @@ export default function WorkerIndex(options) {
             factory: factory,
             options: options
         });
-    }).call(this);
+
+        return this.worker;
+    }
+
+    this.worker = init.call(this);
 }
 
 register("add");
@@ -88,7 +97,7 @@ register("remove");
 
 function register(key) {
 
-    WorkerIndex.prototype[key] = WorkerIndex.prototype[key + "Async"] = function () {
+    WorkerIndex.prototype[key] = WorkerIndex.prototype[key + "Async"] = async function () {
         const self = this,
               args = [].slice.call(arguments),
               arg = args[args.length - 1];
@@ -121,14 +130,16 @@ function register(key) {
     };
 }
 
-async function create(factory, is_node_js, worker_path) {
+function create(factory, is_node_js, worker_path) {
 
     let worker = is_node_js ?
     // This eval will be removed when compiling, it isn't there in final build
 
     "undefined" != typeof module ? (0, eval)('new (require("worker_threads")["Worker"])(__dirname + "/node/node.js")')
     //: (0,eval)('new ((await import("worker_threads"))["Worker"])(import.meta.dirname + "/worker/node.mjs")')
-    : (0, eval)('new ((await import("worker_threads"))["Worker"])((1,eval)(\"import.meta.dirname\") + "/node/node.mjs")')
+    //: (0,eval)('new ((await import("worker_threads"))["Worker"])((1,eval)(\"import.meta.dirname\") + "/node/node.mjs")')
+    : (0, eval)('import("worker_threads").then(function(worker){ return new worker["Worker"]((1,eval)(\"import.meta.dirname\") + "/node/node.mjs"); })')
+    //: import("worker_threads").then(function(worker){ return new worker["Worker"](import.meta.dirname + "/worker/node.mjs"); })
 
     //eval('new (require("worker_threads")["Worker"])(__dirname + "/node/node.js")')
     : factory ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + handler.toString()], { type: "text/javascript" }))) : new window.Worker(is_string(worker_path) ? worker_path : "worker/worker.js", { type: "module" });
diff --git a/dist/module/worker/handler.js b/dist/module/worker/handler.js
index 0ada932..f918d7d 100644
--- a/dist/module/worker/handler.js
+++ b/dist/module/worker/handler.js
@@ -3,59 +3,53 @@ import { IndexOptions } from "../type.js";
 
 export default (async function (data) {
 
-            data = data.data;
+    data = data.data;
 
-            /** @type Index */
-            const index = self._index,
-                  args = data.args,
-                  task = data.task;
+    /** @type Index */
+    const index = self._index,
+          args = data.args,
+          task = data.task;
 
 
-            switch (task) {
+    switch (task) {
 
-                        case "init":
+        case "init":
 
-                                    /** @type IndexOptions */
-                                    let options = data.options || {},
-                                        filepath = options.config;
+            /** @type IndexOptions */
+            let options = data.options || {},
+                filepath = options.config;
 
-                                    if (filepath) {
-                                                options = filepath;
-                                                // will be replaced after build with the line below because
-                                                // there is an issue with closure compiler dynamic import
-                                                //options = await import(filepath);
-                                    }
-
-                                    // deprecated:
-                                    // const encode = options.encode;
-                                    // if(encode && (encode.indexOf("function") === 0)){
-                                    //     options.encode = Function("return " + encode)();
-                                    // }
-
-                                    const factory = data.factory;
-
-                                    if (factory) {
-
-                                                // export the FlexSearch global payload to "self"
-                                                Function("return " + factory)()(self);
-
-                                                /** @type Index */
-                                                self._index = new self.FlexSearch.Index(options);
-
-                                                // destroy the exported payload
-                                                delete self.FlexSearch;
-                                    } else {
-
-                                                self._index = new Index(options);
-                                    }
-
-                                    postMessage({ id: data.id });
-                                    break;
-
-                        default:
-                                    const id = data.id,
-                                          message = index[task].apply(index, args);
-
-                                    postMessage("search" === task ? { id: id, msg: message } : { id: id });
+            if (filepath) {
+                options = filepath;
+                // will be replaced after build with the line below because
+                // there is an issue with closure compiler dynamic import
+                //options = await import(filepath);
             }
+
+            const factory = data.factory;
+
+            if (factory) {
+
+                // export the FlexSearch global payload to "self"
+                Function("return " + factory)()(self);
+
+                /** @type Index */
+                self._index = new self.FlexSearch.Index(options);
+
+                // destroy the exported payload
+                delete self.FlexSearch;
+            } else {
+
+                self._index = new Index(options);
+            }
+
+            postMessage({ id: data.id });
+            break;
+
+        default:
+            const id = data.id,
+                  message = index[task].apply(index, args);
+
+            postMessage("search" === task ? { id: id, msg: message } : { id: id });
+    }
 });
\ No newline at end of file
diff --git a/dist/module/worker/node.js b/dist/module/worker/node.js
index d11807a..48f0621 100644
--- a/dist/module/worker/node.js
+++ b/dist/module/worker/node.js
@@ -7,43 +7,35 @@ const { parentPort } = require("worker_threads"),
 
 let index;
 
-parentPort.on("message", function (data) {
+parentPort.on("message", async function (data) {
 
-            /** @type Index */
-            const args = data.args,
-                  task = data.task,
-                  id = data.id;
+    /** @type Index */
+    const args = data.args,
+          task = data.task,
+          id = data.id;
 
 
-            switch (task) {
+    switch (task) {
 
-                        case "init":
-                                    let options = data.options || {},
-                                        filepath = options.config;
+        case "init":
+            let options = data.options || {},
+                filepath = options.config;
+            // load extern field configuration
 
-                                    // load extern field configuration
-
-                                    // if(filepath && filepath[0] !== "/" && filepath[0] !== "\\"){
-                                    //     // current working directory
-                                    //     const dir = process.cwd();
-                                    //     filepath = join(dir, filepath);
-                                    // }
-                                    if (filepath) {
-                                                options = require(filepath);
-                                    }
-
-                                    // deprecated:
-                                    // const encode = options["encode"];
-                                    // if(encode && (encode.indexOf("function") === 0)){
-                                    //     options["encode"] = new Function("return " + encode)();
-                                    // }
-
-                                    index = new Index(options);
-                                    break;
-
-                        default:
-
-                                    const message = index[task].apply(index, args);
-                                    parentPort.postMessage("search" === task ? { id: id, msg: message } : { id: id });
+            if (filepath) {
+                options = Object.assign({}, options, require(filepath));
+                delete options.worker;
             }
+
+            index = new Index(options);
+            //index.db && await index.db;
+            parentPort.postMessage({ id: id });
+
+            break;
+
+        default:
+
+            const message = index[task].apply(index, args);
+            parentPort.postMessage("search" === task ? { id: id, msg: message } : { id: id });
+    }
 });
\ No newline at end of file
diff --git a/dist/node/node.js b/dist/node/node.js
index a35758d..3898b9a 100644
--- a/dist/node/node.js
+++ b/dist/node/node.js
@@ -6,7 +6,7 @@ const { Index } = require("../flexsearch.bundle.min.js");
 
 let index;
 
-parentPort.on("message", function(data){
+parentPort.on("message", async function(data){
 
     /** @type Index */
     const args = data["args"];
@@ -18,30 +18,26 @@ parentPort.on("message", function(data){
         case "init":
 
             let options = data["options"] || {};
-
             // load extern field configuration
             let filepath = options["config"];
-            // if(filepath && filepath[0] !== "/" && filepath[0] !== "\\"){
-            //     // current working directory
-            //     const dir = process.cwd();
-            //     filepath = join(dir, filepath);
-            // }
             if(filepath){
-                options = require(filepath);
+                options = Object.assign({}, options, require(filepath));
+                delete options.worker;
             }
 
-            // deprecated:
-            // const encode = options["encode"];
-            // if(encode && (encode.indexOf("function") === 0)){
-            //     options["encode"] = new Function("return " + encode)();
-            // }
-
             index = new Index(options);
+            //index.db && await index.db;
+            parentPort.postMessage({ "id": id });
+
             break;
 
         default:
 
             const message = index[task].apply(index, args);
-            parentPort.postMessage(task === "search" ? { "id": id, "msg": message } : { "id": id });
+            parentPort.postMessage(
+                task === "search"
+                    ? { "id": id, "msg": message }
+                    : { "id": id }
+            );
     }
 });
diff --git a/package.json b/package.json
index e4d6318..e2cf965 100644
--- a/package.json
+++ b/package.json
@@ -75,8 +75,8 @@
     "build:module:bundle:debug": "node task/build RELEASE=bundle.module DEBUG=true PROFILER=false SUPPORT_WORKER=true SUPPORT_ENCODER=true SUPPORT_CHARSET=true SUPPORT_CACHE=true SUPPORT_ASYNC=true SUPPORT_STORE=true SUPPORT_TAGS=true SUPPORT_SUGGESTION=true SUPPORT_SERIALIZE=true SUPPORT_DOCUMENT=true POLYFILL=false SUPPORT_PERSISTENT=true SUPPORT_RESOLVER=true SUPPORT_KEYSTORE=true SUPPORT_COMPRESSION=false FORMATTING=PRETTY_PRINT",
     "build:module:compact": "node task/build RELEASE=compact.module DEBUG=false PROFILER=false SUPPORT_WORKER=false SUPPORT_ENCODER=true SUPPORT_CHARSET=true SUPPORT_CACHE=false SUPPORT_ASYNC=true SUPPORT_STORE=true SUPPORT_TAGS=false SUPPORT_SUGGESTION=true SUPPORT_SERIALIZE=true SUPPORT_DOCUMENT=true POLYFILL=false SUPPORT_PERSISTENT=false SUPPORT_RESOLVER=false SUPPORT_KEYSTORE=false SUPPORT_COMPRESSION=false",
     "build:module:compact:debug": "node task/build RELEASE=compact.module DEBUG=true PROFILER=false SUPPORT_WORKER=false SUPPORT_ENCODER=true SUPPORT_CHARSET=true SUPPORT_CACHE=false SUPPORT_ASYNC=true SUPPORT_STORE=true SUPPORT_TAGS=false SUPPORT_SUGGESTION=true SUPPORT_SERIALIZE=true SUPPORT_DOCUMENT=true POLYFILL=false SUPPORT_PERSISTENT=false SUPPORT_RESOLVER=false SUPPORT_KEYSTORE=false SUPPORT_COMPRESSION=false FORMATTING=PRETTY_PRINT",
-    "build:module:light": "node task/build RELEASE=light.module DEBUG=false PROFILER=false SUPPORT_WORKER=false SUPPORT_ENCODER=false SUPPORT_CHARSET=true SUPPORT_CACHE=true SUPPORT_ASYNC=false SUPPORT_STORE=false SUPPORT_TAGS=false SUPPORT_SUGGESTION=false SUPPORT_SERIALIZE=false SUPPORT_DOCUMENT=false POLYFILL=false SUPPORT_PERSISTENT=false SUPPORT_RESOLVER=false SUPPORT_KEYSTORE=false SUPPORT_COMPRESSION=false",
-    "build:module:light:debug": "node task/build RELEASE=light.module DEBUG=true PROFILER=false SUPPORT_WORKER=false SUPPORT_ENCODER=false SUPPORT_CHARSET=true SUPPORT_CACHE=true SUPPORT_ASYNC=false SUPPORT_STORE=false SUPPORT_TAGS=false SUPPORT_SUGGESTION=false SUPPORT_SERIALIZE=false SUPPORT_DOCUMENT=false POLYFILL=false SUPPORT_PERSISTENT=false SUPPORT_RESOLVER=false SUPPORT_KEYSTORE=false SUPPORT_COMPRESSION=false FORMATTING=PRETTY_PRINT",
+    "build:module:light": "node task/build RELEASE=light.module DEBUG=false PROFILER=false SUPPORT_WORKER=false SUPPORT_ENCODER=false SUPPORT_CHARSET=true SUPPORT_CACHE=true SUPPORT_ASYNC=false SUPPORT_STORE=false SUPPORT_TAGS=false SUPPORT_SUGGESTION=true SUPPORT_SERIALIZE=false SUPPORT_DOCUMENT=false POLYFILL=false SUPPORT_PERSISTENT=false SUPPORT_RESOLVER=false SUPPORT_KEYSTORE=false SUPPORT_COMPRESSION=false",
+    "build:module:light:debug": "node task/build RELEASE=light.module DEBUG=true PROFILER=false SUPPORT_WORKER=false SUPPORT_ENCODER=false SUPPORT_CHARSET=true SUPPORT_CACHE=true SUPPORT_ASYNC=false SUPPORT_STORE=false SUPPORT_TAGS=false SUPPORT_SUGGESTION=true SUPPORT_SERIALIZE=false SUPPORT_DOCUMENT=false POLYFILL=false SUPPORT_PERSISTENT=false SUPPORT_RESOLVER=false SUPPORT_KEYSTORE=false SUPPORT_COMPRESSION=false FORMATTING=PRETTY_PRINT",
     "build:all": "npm run build:bundle && npm run build:bundle:debug && npm run build:light && npm run build:light:debug && npm run build:compact && npm run build:compact:debug && npm run build:module && npm run build:module:debug && npm run build:module:min && npm run build:module:bundle && npm run build:module:bundle:debug && npm run build:module:light && npm run build:module:light:debug && npm run build:module:compact && npm run build:module:compact:debug && npm run build:lang && npm run build:es5 && npm run build:es5:debug",
     "build:custom": "node task/build RELEASE=custom",
     "test": "cd test && npm install && npm run test"
diff --git a/src/document.js b/src/document.js
index e1dc22c..88e8346 100644
--- a/src/document.js
+++ b/src/document.js
@@ -128,7 +128,19 @@ export default function Document(options){
         }
     }
 
-    if(SUPPORT_PERSISTENT){
+    if(SUPPORT_WORKER && this.worker){
+        const promises = [];
+        for(const index of this.index.values()){
+            index.worker.then && promises.push(index.worker);
+        }
+        if(promises.length){
+            const self = this;
+            return Promise.all(promises).then(function(){
+                return self;
+            });
+        }
+    }
+    else if(SUPPORT_PERSISTENT){
         options.db && this.mount(options.db);
     }
 }
@@ -247,8 +259,10 @@ function parse_descriptor(options, document){
 
         if(SUPPORT_WORKER && this.worker){
             const worker = new WorkerIndex(opt);
-            index.set(key, worker);
-            if(!worker.worker){
+            if(worker.worker){
+                index.set(key, worker);
+            }
+            else{
                 // fallback when not supported
                 this.worker = false;
             }
diff --git a/src/index.js b/src/index.js
index b4d5f43..497a110 100644
--- a/src/index.js
+++ b/src/index.js
@@ -59,10 +59,12 @@ export default function Index(options, _register){
 
     /** @type ContextOptions */
     const context = options.context || {};
-    const encoder = options.encode || options.encoder || (
-        SUPPORT_ENCODER ? default_encoder : function(str){
-            return str.toLowerCase().trim().split(/\s+/);
-        }
+    const encoder = SUPPORT_CHARSET && is_string(options.encoder)
+        ? Charset[options.encoder]
+        : options.encode || options.encoder || (
+          SUPPORT_ENCODER ? default_encoder : function(str){
+              return str.toLowerCase().trim().split(/\s+/);
+          }
     );
     /** @type Encoder */
     this.encoder = encoder.encode
@@ -109,7 +111,7 @@ export default function Index(options, _register){
 
     if(SUPPORT_PERSISTENT){
         if((tmp = options.db)){
-            this.db = tmp.mount(this);
+            this.db = this.mount(tmp);
         }
         this.commit_auto = options.commit !== false;
         this.commit_task = [];
diff --git a/src/index/search.js b/src/index/search.js
index 75bbf4a..ec131bb 100644
--- a/src/index/search.js
+++ b/src/index/search.js
@@ -209,6 +209,8 @@ Index.prototype.search = function(query, limit, options){
         }
     }
 
+    // from this point there are just multi-term queries
+
     if(SUPPORT_PERSISTENT && this.db){
 
         if(this.db.search){
@@ -226,16 +228,16 @@ Index.prototype.search = function(query, limit, options){
 
                 if(keyword){
 
-                    arr = await self.get_array(term, keyword);
+                    arr = await self.get_array(term, keyword, 0, 0, false, false);
                     arr = add_result(
                         arr,
                         result,
                         suggest,
                         self.resolution_ctx,
-                        /** @type {!number} */ (limit),
-                        offset,
-                        length === 2
-                        /*, term, keyword*/
+                        // 0, // /** @type {!number} */ (limit),
+                        // 0, // offset,
+                        // length === 2
+                        // /*, term, keyword*/
                     );
 
                     // the context is a moving window where the keyword is going forward like a cursor
@@ -247,16 +249,16 @@ Index.prototype.search = function(query, limit, options){
                 }
                 else{
 
-                    arr = await self.get_array(term);
+                    arr = await self.get_array(term, "", 0, 0, false, false);
                     arr = add_result(
                         arr,
                         result,
                         suggest,
                         self.resolution,
-                        /** @type {!number} */ (limit),
-                        offset,
-                        length === 1
-                        /*, term*/
+                        // 0, // /** @type {!number} */ (limit),
+                        // 0, // offset,
+                        // length === 1
+                        // /*, term*/
                     );
                 }
 
@@ -297,16 +299,16 @@ Index.prototype.search = function(query, limit, options){
 
         if(keyword){
 
-            arr = this.get_array(term, keyword);
+            arr = this.get_array(term, keyword, 0, 0, false, false);
             arr = /*this.*/add_result(
                 arr,
                 result,
                 suggest,
                 this.resolution_ctx,
-                /** @type {!number} */ (limit),
-                offset,
-                length === 2
-                /*, term, keyword*/
+                // 0, // /** @type {!number} */ (limit),
+                // 0, // offset,
+                // length === 2
+                // /*, term, keyword*/
             );
 
             // 1. when suggestion enabled just forward keyword if term was found
@@ -317,16 +319,16 @@ Index.prototype.search = function(query, limit, options){
         }
         else{
 
-            arr = this.get_array(term);
+            arr = this.get_array(term, "", 0, 0, false, false);
             arr = /*this.*/add_result(
                 arr,
                 result,
                 suggest,
                 this.resolution,
-                /** @type {!number} */ (limit),
-                offset,
-                length === 1
-                /*, term*/
+                // 0, // /** @type {!number} */ (limit),
+                // 0, // offset,
+                // length === 1
+                // /*, term*/
             );
         }
 
@@ -402,13 +404,10 @@ function single_term_query(term, keyword, limit, offset, resolve, enrich, tag){
  * @param {Array} result
  * @param {Array} suggest
  * @param {number} resolution
- * @param {number} limit
- * @param {number} offset
- * @param {boolean} single_term
  * @return {Array|boolean|undefined}
  */
 
-function add_result(arr, result, suggest, resolution, limit, offset, single_term/*, term, keyword*/){
+function add_result(arr, result, suggest, resolution/*, limit, offset single_term, term, keyword*/){
 
     let word_arr = [];
     //let arr;// = keyword ? this.ctx : this.map;
@@ -423,19 +422,19 @@ function add_result(arr, result, suggest, resolution, limit, offset, single_term
         for(let x = 0, size = 0, tmp; x < resolution; x++){
             if((tmp = arr[x])){
 
-                if(offset){
-                    // apply offset right here on single terms
-                    if(tmp && single_term){
-                        if(tmp.length <= offset){
-                            offset -= tmp.length;
-                            tmp = null;
-                        }
-                        else{
-                            tmp = tmp.slice(offset);
-                            offset = 0;
-                        }
-                    }
-                }
+                // if(offset){
+                //     // apply offset right here on single terms
+                //     if(tmp && single_term){
+                //         if(tmp.length <= offset){
+                //             offset -= tmp.length;
+                //             tmp = null;
+                //         }
+                //         else{
+                //             tmp = tmp.slice(offset);
+                //             offset = 0;
+                //         }
+                //     }
+                // }
 
                 if(tmp){
 
@@ -444,25 +443,25 @@ function add_result(arr, result, suggest, resolution, limit, offset, single_term
                     // simplified score order:
                     //word_arr.push(tmp);
 
-                    if(single_term){
-                        size += tmp.length;
-                        if(size >= limit){
-                            // fast path:
-                            // a single term does not need to pre-collect results
-                            break;
-                        }
-                    }
+                    // if(single_term){
+                    //     size += tmp.length;
+                    //     if(size >= limit){
+                    //         // fast path:
+                    //         // a single term does not need to pre-collect results
+                    //         break;
+                    //     }
+                    // }
                 }
             }
         }
 
         if(word_arr.length){
-            if(single_term){
-                // fast path optimization
-                // offset was already applied at this point
-                // return an array will stop the query process immediately
-                return resolve_default(word_arr, limit, 0);
-            }
+            // if(single_term){
+            //     // fast path optimization
+            //     // offset was already applied at this point
+            //     // return an array will stop the query process immediately
+            //     return resolve_default(word_arr, limit, 0);
+            // }
 
             result.push(word_arr);
             // return nothing will continue the query
diff --git a/src/type.js b/src/type.js
index 2e43ec3..24d1aa9 100644
--- a/src/type.js
+++ b/src/type.js
@@ -19,10 +19,11 @@ import StorageInterface from "./db/interface.js";
  *   resolve: [boolean=true],
  *   db: StorageInterface|undefined,
  *   commit: boolean=true,
+ *   worker: boolean|string|undefined,
  *   config: string|undefined
  * }}
  */
-export let IndexOptions;
+export let IndexOptions = {};
 
 /**
  * @typedef DocumentIndexOptions {{
@@ -40,13 +41,12 @@ export let IndexOptions;
  *   db: StorageInterface|undefined,
  *   commit: boolean=true,
  *   config: string|undefined,
- *
  *   field: string,
  *   filter: Function|undefined,
  *   custom: Function|undefined
  * }}
  */
-export let DocumentIndexOptions;
+export let DocumentIndexOptions = {};
 
 /**
  * @typedef DocumentOptions {{
@@ -66,7 +66,7 @@ export let DocumentIndexOptions;
  *   worker: boolean|string|undefined
  * }}
  */
-export let DocumentOptions;
+export let DocumentOptions = {};
 
 /**
  * @typedef ContextOptions {{
@@ -75,7 +75,7 @@ export let DocumentOptions;
  *   resolution: number|undefined
  * }}
  */
-export let ContextOptions;
+export let ContextOptions = {};
 
 /**
  * @typedef DocumentDescriptor {{
@@ -86,7 +86,7 @@ export let ContextOptions;
  *   store: StoreOptions|Array<StoreOptions>|undefined
  * }}
  */
-export let DocumentDescriptor;
+export let DocumentDescriptor = {};
 
 /**
  * @typedef TagOptions {{
@@ -99,7 +99,7 @@ export let DocumentDescriptor;
  *   config: string|undefined
  * }}
  */
-export let TagOptions;
+export let TagOptions = {};
 
 /**
  * @typedef StoreOptions {{
@@ -109,7 +109,7 @@ export let TagOptions;
  *   config: string|undefined
  * }}
  */
-export let StoreOptions;
+export let StoreOptions = {};
 
 /**
  * @typedef SearchOptions {{
@@ -122,7 +122,7 @@ export let StoreOptions;
  *   enrich: [boolean=false],
  * }}
  */
-export let SearchOptions;
+export let SearchOptions = {};
 // tag: Array|undefined
 
 /**
@@ -140,7 +140,7 @@ export let SearchOptions;
  *   merge: [boolean=false]
  * }}
  */
-export let DocumentSearchOptions;
+export let DocumentSearchOptions = {};
 
 /**
  * @typedef EncoderOptions {{
@@ -161,7 +161,7 @@ export let DocumentSearchOptions;
  *   cache: boolean=true,
  * }}
  */
-export let EncoderOptions;
+export let EncoderOptions = {};
 
 /**
  * @typedef EncoderSplitOptions {{
@@ -173,7 +173,7 @@ export let EncoderOptions;
  *   char: string|Array<string>|undefined,
  * }}
  */
-export let EncoderSplitOptions;
+export let EncoderSplitOptions = {};
 
 /**
  * @typedef PersistentOptions {{
@@ -183,4 +183,4 @@ export let EncoderSplitOptions;
  *   db: *|undefined
  * }}
  */
-export let PersistentOptions;
\ No newline at end of file
+export let PersistentOptions = {};
\ No newline at end of file
diff --git a/src/webpack.js b/src/webpack.js
index 17e3ede..dd300b2 100644
--- a/src/webpack.js
+++ b/src/webpack.js
@@ -71,6 +71,7 @@ if(SUPPORT_PERSISTENT){
 /** @export */ Index.prototype.cache;
 /** @export */ Index.prototype.bypass;
 /** @export */ Index.prototype.document;
+/** @export */ Index.prototype.encoder;
 }
 
 /** @export */ Document.prototype.add;
diff --git a/src/worker.js b/src/worker.js
index b1ca593..72d5eb8 100644
--- a/src/worker.js
+++ b/src/worker.js
@@ -1,4 +1,3 @@
-//import { promise as Promise } from "../polyfill.js";
 import { IndexOptions } from "./type.js";
 import { create_object, is_function, is_object, is_string } from "./common.js";
 import handler from "./worker/handler.js";
@@ -10,27 +9,19 @@ let pid = 0;
  * @constructor
  */
 
-export default function WorkerIndex(options){
+export default function WorkerIndex(options = {}){
 
     if(!this) {
         return new WorkerIndex(options);
     }
 
-    if(options){
-        // deprecated:
-        // was replaced by dynamic config loading
-        // if(is_function(options.encode)){
-        //     options.encode = options.encode.toString();
-        // }
-    }
-    else{
-        options = {};
-    }
-
     // the factory is the outer wrapper from the build
-    // we use "self" as a trap for node.js
-
-    let factory = typeof self !== "undefined" && (self||window)["_factory"];
+    // it uses "self" as a trap for node.js
+    let factory = typeof self !== "undefined"
+        ? self["_factory"]
+        : typeof window !== "undefined"
+            ? window["_factory"]
+            : null;
     if(factory){
         factory = factory.toString();
     }
@@ -38,9 +29,18 @@ export default function WorkerIndex(options){
     const is_node_js = typeof window === "undefined" /*&& self["exports"]*/;
     const _self = this;
 
-    (async function(){
+    /**
+     * @param {Worker=} _worker
+     * @this {WorkerIndex}
+     */
+    function init(_worker){
+
+        this.worker = _worker || create(factory, is_node_js, options.worker);
+
+        if(this.worker.then){
+            return this.worker.then(init);
+        }
 
-        this.worker = await create(factory, is_node_js, options.worker);
         this.resolver = create_object();
 
         if(!this.worker){
@@ -63,14 +63,16 @@ export default function WorkerIndex(options){
 
         if(options.config){
 
-            delete options.db;
+            //delete options.db;
 
             // when extern configuration needs to be loaded
             // it needs to return a promise to await for
             return new Promise(function(resolve){
+
                 _self.resolver[++pid] = function(){
                     resolve(_self);
                 };
+
                 _self.worker.postMessage({
                     "id": pid,
                     "task": "init",
@@ -86,7 +88,10 @@ export default function WorkerIndex(options){
             "options": options
         });
 
-    }.call(this));
+        return this.worker;
+    }
+
+    this.worker = init.call(this);
 }
 
 register("add");
@@ -98,7 +103,7 @@ register("remove");
 function register(key){
 
     WorkerIndex.prototype[key] =
-    WorkerIndex.prototype[key + "Async"] = function(){
+    WorkerIndex.prototype[key + "Async"] = async function(){
 
         const self = this;
         const args = [].slice.call(arguments);
@@ -132,7 +137,7 @@ function register(key){
     };
 }
 
-async function create(factory, is_node_js, worker_path){
+function create(factory, is_node_js, worker_path){
 
     let worker
 
@@ -142,7 +147,9 @@ async function create(factory, is_node_js, worker_path){
             typeof module !== "undefined"
                 ? (0,eval)('new (require("worker_threads")["Worker"])(__dirname + "/node/node.js")')
                 //: (0,eval)('new ((await import("worker_threads"))["Worker"])(import.meta.dirname + "/worker/node.mjs")')
-                : (0,eval)('new ((await import("worker_threads"))["Worker"])((1,eval)(\"import.meta.dirname\") + "/node/node.mjs")')
+                //: (0,eval)('new ((await import("worker_threads"))["Worker"])((1,eval)(\"import.meta.dirname\") + "/node/node.mjs")')
+                : (0,eval)('import("worker_threads").then(function(worker){ return new worker["Worker"]((1,eval)(\"import.meta.dirname\") + "/node/node.mjs"); })')
+                //: import("worker_threads").then(function(worker){ return new worker["Worker"](import.meta.dirname + "/worker/node.mjs"); })
 
         //eval('new (require("worker_threads")["Worker"])(__dirname + "/node/node.js")')
     :(
@@ -158,4 +165,4 @@ async function create(factory, is_node_js, worker_path){
     );
 
     return worker;
-}
\ No newline at end of file
+}
diff --git a/src/worker/handler.js b/src/worker/handler.js
index df9fdbd..881878c 100644
--- a/src/worker/handler.js
+++ b/src/worker/handler.js
@@ -24,12 +24,6 @@ export default async function(data) {
                 //options = await import(filepath);
             }
 
-            // deprecated:
-            // const encode = options.encode;
-            // if(encode && (encode.indexOf("function") === 0)){
-            //     options.encode = Function("return " + encode)();
-            // }
-
             const factory = data["factory"];
 
             if(factory){
@@ -55,6 +49,10 @@ export default async function(data) {
 
             const id = data["id"];
             const message = index[task].apply(index, args);
-            postMessage(task === "search" ? { "id": id, "msg": message } : { "id": id });
+            postMessage(
+                task === "search"
+                    ? { "id": id, "msg": message }
+                    : { "id": id }
+            );
     }
 };
diff --git a/src/worker/node.js b/src/worker/node.js
index a35758d..3898b9a 100644
--- a/src/worker/node.js
+++ b/src/worker/node.js
@@ -6,7 +6,7 @@ const { Index } = require("../flexsearch.bundle.min.js");
 
 let index;
 
-parentPort.on("message", function(data){
+parentPort.on("message", async function(data){
 
     /** @type Index */
     const args = data["args"];
@@ -18,30 +18,26 @@ parentPort.on("message", function(data){
         case "init":
 
             let options = data["options"] || {};
-
             // load extern field configuration
             let filepath = options["config"];
-            // if(filepath && filepath[0] !== "/" && filepath[0] !== "\\"){
-            //     // current working directory
-            //     const dir = process.cwd();
-            //     filepath = join(dir, filepath);
-            // }
             if(filepath){
-                options = require(filepath);
+                options = Object.assign({}, options, require(filepath));
+                delete options.worker;
             }
 
-            // deprecated:
-            // const encode = options["encode"];
-            // if(encode && (encode.indexOf("function") === 0)){
-            //     options["encode"] = new Function("return " + encode)();
-            // }
-
             index = new Index(options);
+            //index.db && await index.db;
+            parentPort.postMessage({ "id": id });
+
             break;
 
         default:
 
             const message = index[task].apply(index, args);
-            parentPort.postMessage(task === "search" ? { "id": id, "msg": message } : { "id": id });
+            parentPort.postMessage(
+                task === "search"
+                    ? { "id": id, "msg": message }
+                    : { "id": id }
+            );
     }
 });
diff --git a/src/worker/node.mjs b/src/worker/node.mjs
index 11c9e08..0248f08 100644
--- a/src/worker/node.mjs
+++ b/src/worker/node.mjs
@@ -1,8 +1,9 @@
 import { parentPort } from "worker_threads";
 import { join } from "path";
 // Test Path
-import { Index } from "../../dist/flexsearch.bundle.module.min.js";
-//import { Index } from "../flexsearch.bundle.module.min.js";
+//import Index from "../../src/index.js";
+//import { Index } from "../../dist/flexsearch.bundle.module.min.js";
+import { Index } from "../flexsearch.bundle.module.min.js";
 
 let index;
 
@@ -18,25 +19,27 @@ parentPort.on("message", async function(data){
         case "init":
 
             let options = data["options"] || {};
-
             // load extern field configuration
             let filepath = options["config"];
-            // if(filepath && filepath[0] !== "/" && filepath[0] !== "\\"){
-            //     // current working directory
-            //     const dir = process.cwd();
-            //     filepath = "file:///" + join(dir, filepath);
-            // }
             if(filepath){
-                filepath = "file:///" + filepath;
-                options = await import(filepath);
+                filepath = join("file://", filepath);
+                options = Object.assign({}, options, (await import(filepath))["default"]);
+                delete options.worker;
             }
 
             index = new Index(options);
+            //index.db && await index.db;
+            parentPort.postMessage({ "id": id });
+
             break;
 
         default:
 
             const message = index[task].apply(index, args);
-            parentPort.postMessage(task === "search" ? { "id": id, "msg": message } : { "id": id });
+            parentPort.postMessage(
+                task === "search"
+                    ? { "id": id, "msg": message }
+                    : { "id": id }
+            );
     }
 });