diff --git a/dist/db/indexeddb/index.js b/dist/db/indexeddb/index.js
index c662431..daa5503 100644
--- a/dist/db/indexeddb/index.js
+++ b/dist/db/indexeddb/index.js
@@ -327,7 +327,7 @@ IdxDB.prototype.transaction = function(ref, modifier, task){
         };
         const promise = task.call(this, store);
         // transactions can just be used within the same event loop
-        // the indexeddb is just a stupid thing
+        // the indexeddb is such a stupid tool :(
         this.trx[ref+ ":" + modifier] = null;
         return promise;
     });
diff --git a/dist/flexsearch.bundle.debug.js b/dist/flexsearch.bundle.debug.js
index d27dbc5..7c1af9c 100644
--- a/dist/flexsearch.bundle.debug.js
+++ b/dist/flexsearch.bundle.debug.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.115 (Bundle/Debug)
+ * FlexSearch.js v0.8.117 (Bundle/Debug)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -301,29 +301,24 @@ async function ka(a) {
   }
 }
 ;function la(a) {
-  P.call(a, "add");
-  P.call(a, "append");
-  P.call(a, "search");
-  P.call(a, "update");
-  P.call(a, "remove");
+  ma.call(a, "add");
+  ma.call(a, "append");
+  ma.call(a, "search");
+  ma.call(a, "update");
+  ma.call(a, "remove");
 }
-let ma, na;
-const oa = {}, pa = {};
-function qa(a) {
-  ma = 0;
-  oa[a] = pa[a];
+let na, oa, pa;
+function qa() {
+  na = pa = 0;
 }
-function P(a) {
+function ma(a) {
   this[a + "Async"] = function() {
     const b = arguments;
     var c = b[b.length - 1];
     let e;
     "function" === typeof c && (e = c, delete b[b.length - 1]);
-    ma || (ma = setTimeout(qa, 0, a), na = Date.now());
-    pa[a] || (pa[a] = oa[a] = 1000);
-    if (!--oa[a]) {
-      oa[a] = pa[a] = pa[a] * this.priority * this.priority * 3 / (Date.now() - na) | 0 || 1;
-      ma = clearTimeout(ma);
+    na ? pa || (pa = Date.now() - oa >= this.priority * this.priority * 3) : (na = setTimeout(qa, 0), oa = Date.now());
+    if (pa) {
       const f = this;
       return new Promise(g => {
         setTimeout(function() {
@@ -337,7 +332,7 @@ function P(a) {
     return c;
   };
 }
-;let ra = 0;
+;let P = 0;
 function Q(a = {}) {
   function b(g) {
     function k(h) {
@@ -351,13 +346,15 @@ function Q(a = {}) {
       e ? this.worker.on("message", k) : this.worker.onmessage = k;
       if (a.config) {
         return new Promise(function(h) {
-          d.h[++ra] = function() {
+          d.h[++P] = function() {
             h(d);
+            1e9 < P && (P = 0);
           };
-          d.worker.postMessage({id:ra, task:"init", factory:c, options:a});
+          d.worker.postMessage({id:P, task:"init", factory:c, options:a});
         });
       }
       this.worker.postMessage({task:"init", factory:c, options:a});
+      this.priority = a.priority || 4;
       return this;
     }
   }
@@ -366,7 +363,7 @@ function Q(a = {}) {
   }
   let c = "undefined" !== typeof self ? self._factory : "undefined" !== typeof window ? window._factory : null;
   c && (c = c.toString());
-  const e = "undefined" === typeof window, d = this, f = sa(c, e, a.worker);
+  const e = "undefined" === typeof window, d = this, f = ra(c, e, a.worker);
   return f.then ? f.then(function(g) {
     return b.call(d, g);
   }) : b.call(this, f);
@@ -388,17 +385,17 @@ function R(a) {
     "function" === typeof e && (d = e, c.pop());
     e = new Promise(function(f) {
       "export" === a && "function" === typeof c[0] && (c[0] = null);
-      b.h[++ra] = f;
-      b.worker.postMessage({task:a, id:ra, args:c});
+      b.h[++P] = f;
+      b.worker.postMessage({task:a, id:P, args:c});
     });
     return d ? (e.then(d), this) : e;
   };
 }
-function sa(a, b, c) {
+function ra(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=" + ka.toString()], {type:"text/javascript"}))) : new window.Worker("string" === typeof c ? c : (0,eval)("import.meta.url").replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", 
   "module/worker/worker.js"), {type:"module"});
 }
-;function ta(a, b = 0) {
+;function sa(a, b = 0) {
   let c = [], e = [];
   b && (b = 250000 / b * 5000 | 0);
   for (const d of a.entries()) {
@@ -407,30 +404,30 @@ function sa(a, b, c) {
   e.length && c.push(e);
   return c;
 }
-function ua(a, b) {
+function ta(a, b) {
   b || (b = new Map());
   for (let c = 0, e; c < a.length; c++) {
     e = a[c], b.set(e[0], e[1]);
   }
   return b;
 }
-function va(a, b = 0) {
+function ua(a, b = 0) {
   let c = [], e = [];
   b && (b = 250000 / b * 1000 | 0);
   for (const d of a.entries()) {
-    e.push([d[0], ta(d[1])[0]]), e.length === b && (c.push(e), e = []);
+    e.push([d[0], sa(d[1])[0]]), e.length === b && (c.push(e), e = []);
   }
   e.length && c.push(e);
   return c;
 }
-function wa(a, b) {
+function va(a, b) {
   b || (b = new Map());
   for (let c = 0, e, d; c < a.length; c++) {
-    e = a[c], d = b.get(e[0]), b.set(e[0], ua(e[1], d));
+    e = a[c], d = b.get(e[0]), b.set(e[0], ta(e[1], d));
   }
   return b;
 }
-function xa(a) {
+function wa(a) {
   let b = [], c = [];
   for (const e of a.keys()) {
     c.push(e), 250000 === c.length && (b.push(c), c = []);
@@ -438,14 +435,14 @@ function xa(a) {
   c.length && b.push(c);
   return b;
 }
-function ya(a, b) {
+function xa(a, b) {
   b || (b = new Set());
   for (let c = 0; c < a.length; c++) {
     b.add(a[c]);
   }
   return b;
 }
-function za(a, b, c, e, d, f, g = 0) {
+function ya(a, b, c, e, d, f, g = 0) {
   const k = e && e.constructor === Array;
   var h = k ? e.shift() : e;
   if (!h) {
@@ -454,12 +451,12 @@ function za(a, b, c, e, d, f, g = 0) {
   if ((h = a((b ? b + "." : "") + (g + 1) + "." + c, JSON.stringify(h))) && h.then) {
     const l = this;
     return h.then(function() {
-      return za.call(l, a, b, c, k ? e : null, d, f, g + 1);
+      return ya.call(l, a, b, c, k ? e : null, d, f, g + 1);
     });
   }
-  return za.call(this, a, b, c, k ? e : null, d, f, g + 1);
+  return ya.call(this, a, b, c, k ? e : null, d, f, g + 1);
 }
-;function Aa(a, b, c, e) {
+;function za(a, b, c, e) {
   let d = [];
   for (let f = 0, g; f < a.index.length; f++) {
     if (g = a.index[f], b >= g.length) {
@@ -525,12 +522,12 @@ function S(a) {
     }
     if ("slice" === e) {
       return function(d, f) {
-        return Aa(b, d || 0, f || b.length, !1);
+        return za(b, d || 0, f || b.length, !1);
       };
     }
     if ("splice" === e) {
       return function(d, f) {
-        return Aa(b, d || 0, f || b.length, !0);
+        return za(b, d || 0, f || b.length, !0);
       };
     }
     if ("constructor" === e) {
@@ -561,7 +558,7 @@ function T(a = 8) {
   this.index = B();
   this.B = [];
   this.size = 0;
-  32 < a ? (this.h = Ba, this.A = BigInt(a)) : (this.h = Ca, this.A = a);
+  32 < a ? (this.h = Aa, this.A = BigInt(a)) : (this.h = Ba, this.A = a);
 }
 T.prototype.get = function(a) {
   const b = this.index[this.h(a)];
@@ -578,7 +575,7 @@ function U(a = 8) {
   }
   this.index = B();
   this.h = [];
-  32 < a ? (this.B = Ba, this.A = BigInt(a)) : (this.B = Ca, this.A = a);
+  32 < a ? (this.B = Aa, this.A = BigInt(a)) : (this.B = Ba, this.A = a);
 }
 U.prototype.add = function(a) {
   var b = this.B(a);
@@ -620,7 +617,7 @@ t.entries = U.prototype.entries = function*() {
     }
   }
 };
-function Ca(a) {
+function Ba(a) {
   let b = 2 ** this.A - 1;
   if ("number" == typeof a) {
     return a & b;
@@ -631,7 +628,7 @@ function Ca(a) {
   }
   return 32 === this.A ? c + 2 ** 31 : c;
 }
-function Ba(a) {
+function Aa(a) {
   let b = BigInt(2) ** this.A - BigInt(1);
   var c = typeof a;
   if ("bigint" === c) {
@@ -661,7 +658,7 @@ function Ba(a) {
         d && e.add(a, d, !1, !0);
       } else {
         if (d = h.I, !d || d(b)) {
-          h.constructor === String ? h = ["" + h] : E(h) && (h = [h]), Da(b, h, this.J, 0, e, a, h[0], c);
+          h.constructor === String ? h = ["" + h] : E(h) && (h = [h]), Ca(b, h, this.J, 0, e, a, h[0], c);
         }
       }
     }
@@ -724,7 +721,7 @@ function Ba(a) {
             k[l] = b[l];
             continue;
           }
-          Ea(b, k, l, 0, l[0], n);
+          Da(b, k, l, 0, l[0], n);
         }
       }
       this.store.set(a, k || b);
@@ -733,21 +730,21 @@ function Ba(a) {
   }
   return this;
 };
-function Ea(a, b, c, e, d, f) {
+function Da(a, b, c, e, d, f) {
   a = a[d];
   if (e === c.length - 1) {
     b[d] = f || a;
   } else if (a) {
     if (a.constructor === Array) {
       for (b = b[d] = Array(a.length), d = 0; d < a.length; d++) {
-        Ea(a, b, c, e, d);
+        Da(a, b, c, e, d);
       }
     } else {
-      b = b[d] || (b[d] = B()), d = c[++e], Ea(a, b, c, e, d);
+      b = b[d] || (b[d] = B()), d = c[++e], Da(a, b, c, e, d);
     }
   }
 }
-function Da(a, b, c, e, d, f, g, k) {
+function Ca(a, b, c, e, d, f, g, k) {
   if (a = a[g]) {
     if (e === b.length - 1) {
       if (a.constructor === Array) {
@@ -763,17 +760,17 @@ function Da(a, b, c, e, d, f, g, k) {
     } else {
       if (a.constructor === Array) {
         for (g = 0; g < a.length; g++) {
-          Da(a, b, c, e, d, f, g, k);
+          Ca(a, b, c, e, d, f, g, k);
         }
       } else {
-        g = b[++e], Da(a, b, c, e, d, f, g, k);
+        g = b[++e], Ca(a, b, c, e, d, f, g, k);
       }
     }
   } else {
     d.db && d.remove(f);
   }
 }
-;function Fa(a, b, c, e, d, f, g) {
+;function Ea(a, b, c, e, d, f, g) {
   const k = a.length;
   let h = [], l;
   var n;
@@ -789,7 +786,7 @@ function Da(a, b, c, e, d, f, g, k) {
   }
   if (a = h.length) {
     if (d) {
-      h = 1 < h.length ? Ga(h, c, e, g, f) : (h = h[0]).length > c || e ? h.slice(e, c + e) : h;
+      h = 1 < h.length ? Fa(h, c, e, g, f) : (h = h[0]).length > c || e ? h.slice(e, c + e) : h;
     } else {
       if (a < k) {
         return [];
@@ -822,7 +819,7 @@ function Da(a, b, c, e, d, f, g, k) {
   }
   return h;
 }
-function Ga(a, b, c, e, d) {
+function Fa(a, b, c, e, d) {
   const f = [], g = B();
   let k;
   var h = a.length;
@@ -867,7 +864,7 @@ function Ga(a, b, c, e, d) {
   }
   return f;
 }
-function Ha(a, b, c) {
+function Ga(a, b, c) {
   const e = B(), d = [];
   for (let f = 0, g; f < b.length; f++) {
     g = b[f];
@@ -888,7 +885,7 @@ function Ha(a, b, c) {
   }
   return d;
 }
-;function Ia(a, b, c, e) {
+;function Ha(a, b, c, e) {
   if (!a.length) {
     return a;
   }
@@ -919,7 +916,7 @@ function Ha(a, b, c) {
   d = 1 < d.length ? [].concat.apply([], d) : d[0];
   return e ? W.call(this, d) : d;
 }
-;function Ja(a, b, c) {
+;function Ia(a, b, c) {
   var e = c[0];
   if (e.then) {
     return Promise.all(c).then(function(n) {
@@ -966,10 +963,10 @@ function Ha(a, b, c) {
   return {O:e, P:d, limit:f, offset:g, enrich:k, resolve:h, suggest:l};
 }
 ;X.prototype.or = function() {
-  const {O:a, P:b, limit:c, offset:e, enrich:d, resolve:f} = Ja(this, "or", arguments);
-  return Ka.call(this, a, b, c, e, d, f);
+  const {O:a, P:b, limit:c, offset:e, enrich:d, resolve:f} = Ia(this, "or", arguments);
+  return Ja.call(this, a, b, c, e, d, f);
 };
-function Ka(a, b, c, e, d, f) {
+function Ja(a, b, c, e, d, f) {
   if (b.length) {
     const g = this;
     return Promise.all(b).then(function(k) {
@@ -977,10 +974,10 @@ function Ka(a, b, c, e, d, f) {
       for (let h = 0, l; h < k.length; h++) {
         (l = k[h]).length && (a[h] = l);
       }
-      return Ka.call(g, a, [], c, e, d, f);
+      return Ja.call(g, a, [], c, e, d, f);
     });
   }
-  a.length && (this.result.length && a.push(this.result), 2 > a.length ? this.result = a[0] : (this.result = Ga(a, c, e, !1, this.h), e = 0));
+  a.length && (this.result.length && a.push(this.result), 2 > a.length ? this.result = a[0] : (this.result = Fa(a, c, e, !1, this.h), e = 0));
   return f ? this.resolve(c, e, d) : this;
 }
 ;X.prototype.and = function() {
@@ -990,11 +987,40 @@ function Ka(a, b, c, e, d, f) {
     f && (a = !!f.suggest, d = f.resolve, b = f.limit, c = f.offset, e = f.enrich && d);
   }
   if (a) {
-    const {O:f, P:g, limit:k, offset:h, enrich:l, resolve:n, suggest:m} = Ja(this, "and", arguments);
-    return La.call(this, f, g, k, h, l, n, m);
+    const {O:f, P:g, limit:k, offset:h, enrich:l, resolve:n, suggest:m} = Ia(this, "and", arguments);
+    return Ka.call(this, f, g, k, h, l, n, m);
   }
   return d ? this.resolve(b, c, e) : this;
 };
+function Ka(a, b, c, e, d, f, g) {
+  if (b.length) {
+    const k = this;
+    return Promise.all(b).then(function(h) {
+      a = [];
+      for (let l = 0, n; l < h.length; l++) {
+        (n = h[l]).length && (a[l] = n);
+      }
+      return Ka.call(k, a, [], c, e, d, f, g);
+    });
+  }
+  if (a.length) {
+    if (this.result.length && a.unshift(this.result), 2 > a.length) {
+      this.result = a[0];
+    } else {
+      if (b = ca(a)) {
+        return this.result = Ea(a, b, c, e, g, this.h, f), f ? d ? W.call(this.index, this.result) : this.result : this;
+      }
+      this.result = [];
+    }
+  } else {
+    g || (this.result = a);
+  }
+  return f ? this.resolve(c, e, d) : this;
+}
+;X.prototype.xor = function() {
+  const {O:a, P:b, limit:c, offset:e, enrich:d, resolve:f, suggest:g} = Ia(this, "xor", arguments);
+  return La.call(this, a, b, c, e, d, f, g);
+};
 function La(a, b, c, e, d, f, g) {
   if (b.length) {
     const k = this;
@@ -1010,43 +1036,14 @@ function La(a, b, c, e, d, f, g) {
     if (this.result.length && a.unshift(this.result), 2 > a.length) {
       this.result = a[0];
     } else {
-      if (b = ca(a)) {
-        return this.result = Fa(a, b, c, e, g, this.h, f), f ? d ? W.call(this.index, this.result) : this.result : this;
-      }
-      this.result = [];
+      return this.result = Ma.call(this, a, c, e, f, this.h), f ? d ? W.call(this.index, this.result) : this.result : this;
     }
   } else {
     g || (this.result = a);
   }
   return f ? this.resolve(c, e, d) : this;
 }
-;X.prototype.xor = function() {
-  const {O:a, P:b, limit:c, offset:e, enrich:d, resolve:f, suggest:g} = Ja(this, "xor", arguments);
-  return Ma.call(this, a, b, c, e, d, f, g);
-};
-function Ma(a, b, c, e, d, f, g) {
-  if (b.length) {
-    const k = this;
-    return Promise.all(b).then(function(h) {
-      a = [];
-      for (let l = 0, n; l < h.length; l++) {
-        (n = h[l]).length && (a[l] = n);
-      }
-      return Ma.call(k, a, [], c, e, d, f, g);
-    });
-  }
-  if (a.length) {
-    if (this.result.length && a.unshift(this.result), 2 > a.length) {
-      this.result = a[0];
-    } else {
-      return this.result = Na.call(this, a, c, e, f, this.h), f ? d ? W.call(this.index, this.result) : this.result : this;
-    }
-  } else {
-    g || (this.result = a);
-  }
-  return f ? this.resolve(c, e, d) : this;
-}
-function Na(a, b, c, e, d) {
+function Ma(a, b, c, e, d) {
   const f = [], g = B();
   let k = 0;
   for (let h = 0, l; h < a.length; h++) {
@@ -1092,10 +1089,10 @@ function Na(a, b, c, e, d) {
   return f;
 }
 ;X.prototype.not = function() {
-  const {O:a, P:b, limit:c, offset:e, enrich:d, resolve:f, suggest:g} = Ja(this, "not", arguments);
-  return Oa.call(this, a, b, c, e, d, f, g);
+  const {O:a, P:b, limit:c, offset:e, enrich:d, resolve:f, suggest:g} = Ia(this, "not", arguments);
+  return Na.call(this, a, b, c, e, d, f, g);
 };
-function Oa(a, b, c, e, d, f, g) {
+function Na(a, b, c, e, d, f, g) {
   if (b.length) {
     const k = this;
     return Promise.all(b).then(function(h) {
@@ -1103,17 +1100,17 @@ function Oa(a, b, c, e, d, f, g) {
       for (let l = 0, n; l < h.length; l++) {
         (n = h[l]).length && (a[l] = n);
       }
-      return Oa.call(k, a, [], c, e, d, f, g);
+      return Na.call(k, a, [], c, e, d, f, g);
     });
   }
   if (a.length && this.result.length) {
-    this.result = Pa.call(this, a, c, e, f);
+    this.result = Oa.call(this, a, c, e, f);
   } else if (f) {
     return this.resolve(c, e, d);
   }
   return f ? d ? W.call(this.index, this.result) : this.result : this;
 }
-function Pa(a, b, c, e) {
+function Oa(a, b, c, e) {
   const d = [];
   a = new Set(a.flat().flat());
   for (let f = 0, g, k = 0; f < this.result.length; f++) {
@@ -1188,7 +1185,7 @@ X.prototype.boost = function(a) {
 X.prototype.resolve = function(a, b, c) {
   const e = this.result, d = this.index;
   this.result = this.index = null;
-  return e.length ? ("object" === typeof a && (c = a.enrich, b = a.offset, a = a.limit), Ia.call(d, e, a || 100, b, c)) : e;
+  return e.length ? ("object" === typeof a && (c = a.enrich, b = a.offset, a = a.limit), Ha.call(d, e, a || 100, b, c)) : e;
 };
 B();
 V.prototype.search = function(a, b, c, e) {
@@ -1268,7 +1265,7 @@ V.prototype.search = function(a, b, c, e) {
               }
               r.push(m = m.db.tag(v[p + 1], b, l, u));
             } else {
-              m = Qa.call(this, v[p], v[p + 1], b, l, u);
+              m = Pa.call(this, v[p], v[p + 1], b, l, u);
             }
             d.push({field:v[p], tag:v[p + 1], result:m});
           }
@@ -1320,7 +1317,7 @@ V.prototype.search = function(a, b, c, e) {
           }
         }
       } else {
-        for (let G = 0, K, rb; G < p.length; G += 2) {
+        for (let G = 0, K, qb; G < p.length; G += 2) {
           K = this.tag.get(p[G]);
           if (!K) {
             if (console.warn("Tag '" + p[G] + ":" + p[G + 1] + "' will be skipped because there is no field '" + p[G] + "'."), r) {
@@ -1329,7 +1326,7 @@ V.prototype.search = function(a, b, c, e) {
               return m ? d : new X(d);
             }
           }
-          if (rb = (K = K && K.get(p[G + 1])) && K.length) {
+          if (qb = (K = K && K.get(p[G + 1])) && K.length) {
             y++, x.push(K);
           } else if (!r) {
             return m ? d : new X(d);
@@ -1337,7 +1334,7 @@ V.prototype.search = function(a, b, c, e) {
         }
       }
       if (y) {
-        w = Ha(w, x, m);
+        w = Ga(w, x, m);
         H = w.length;
         if (!H && !r) {
           return m ? w : new X(w);
@@ -1391,12 +1388,12 @@ V.prototype.search = function(a, b, c, e) {
       for (let D = 0; D < w.length; D++) {
         d[D].result = w[D];
       }
-      return k ? Ra(d, b) : q ? Sa(d, a, z.index, z.field, z.D, q) : d;
+      return k ? Qa(d, b) : q ? Ra(d, a, z.index, z.field, z.D, q) : d;
     });
   }
-  return k ? Ra(d, b) : q ? Sa(d, a, this.index, this.field, this.D, q) : d;
+  return k ? Qa(d, b) : q ? Ra(d, a, this.index, this.field, this.D, q) : d;
 };
-function Sa(a, b, c, e, d, f) {
+function Ra(a, b, c, e, d, f) {
   let g, k, h;
   for (let n = 0, m, q, p, r, u; n < a.length; n++) {
     m = a[n].result;
@@ -1438,7 +1435,7 @@ function Sa(a, b, c, e, d, f) {
   }
   return a;
 }
-function Ra(a, b) {
+function Qa(a, b) {
   const c = [], e = B();
   for (let d = 0, f, g; d < a.length; d++) {
     f = a[d];
@@ -1457,7 +1454,7 @@ function Ra(a, b) {
   }
   return c;
 }
-function Qa(a, b, c, e, d) {
+function Pa(a, b, c, e, d) {
   let f = this.tag.get(a);
   if (!f) {
     return console.warn("Tag '" + a + "' was not found"), [];
@@ -1489,7 +1486,7 @@ function W(a) {
   this.D = [];
   this.field = [];
   this.J = [];
-  this.key = (c = b.key || b.id) && Ta(c, this.J) || "id";
+  this.key = (c = b.key || b.id) && Sa(c, this.J) || "id";
   (e = a.keystore || 0) && (this.keystore = e);
   this.fastupdate = !!a.fastupdate;
   this.reg = !this.fastupdate || a.worker || a.db ? e ? new U(e) : new Set() : e ? new T(e) : new Map();
@@ -1498,7 +1495,8 @@ function W(a) {
   this.cache = (c = a.cache || null) && new Y(c);
   a.cache = !1;
   this.worker = a.worker;
-  this.index = Ua.call(this, a, b);
+  this.priority = a.priority || 4;
+  this.index = Ta.call(this, a, b);
   this.tag = null;
   if (c = b.tag) {
     if ("string" === typeof c && (c = [c]), c.length) {
@@ -1511,7 +1509,7 @@ function W(a) {
         if (!g) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
-        f.custom ? this.F[d] = f.custom : (this.F[d] = Ta(g, this.J), f.filter && ("string" === typeof this.F[d] && (this.F[d] = new String(this.F[d])), this.F[d].I = f.filter));
+        f.custom ? this.F[d] = f.custom : (this.F[d] = Sa(g, this.J), f.filter && ("string" === typeof this.F[d] && (this.F[d] = new String(this.F[d])), this.F[d].I = f.filter));
         this.R[d] = g;
         this.tag.set(g, new Map());
       }
@@ -1583,7 +1581,7 @@ t.destroy = function() {
   }
   return Promise.all(a);
 };
-function Ua(a, b) {
+function Ta(a, b) {
   const c = new Map();
   let e = b.index || b.field || b;
   E(e) && (e = [e]);
@@ -1596,19 +1594,19 @@ function Ua(a, b) {
       c.set(f, k);
     }
     this.worker || c.set(f, new O(g, this.reg));
-    g.custom ? this.D[d] = g.custom : (this.D[d] = Ta(f, this.J), g.filter && ("string" === typeof this.D[d] && (this.D[d] = new String(this.D[d])), this.D[d].I = g.filter));
+    g.custom ? this.D[d] = g.custom : (this.D[d] = Sa(f, this.J), g.filter && ("string" === typeof this.D[d] && (this.D[d] = new String(this.D[d])), this.D[d].I = g.filter));
     this.field[d] = f;
   }
   if (this.C) {
     a = b.store;
     E(a) && (a = [a]);
     for (let d = 0, f, g; d < a.length; d++) {
-      f = a[d], g = f.field || f, f.custom ? (this.C[d] = f.custom, f.custom.V = g) : (this.C[d] = Ta(g, this.J), f.filter && ("string" === typeof this.C[d] && (this.C[d] = new String(this.C[d])), this.C[d].I = f.filter));
+      f = a[d], g = f.field || f, f.custom ? (this.C[d] = f.custom, f.custom.V = g) : (this.C[d] = Sa(g, this.J), f.filter && ("string" === typeof this.C[d] && (this.C[d] = new String(this.C[d])), this.C[d].I = f.filter));
     }
   }
   return c;
 }
-function Ta(a, b) {
+function Sa(a, b) {
   const c = a.split(":");
   let e = 0;
   for (let d = 0; d < c.length; d++) {
@@ -1674,7 +1672,7 @@ t.set = function(a, b) {
   this.store.set(a, b);
   return this;
 };
-t.searchCache = Va;
+t.searchCache = Ua;
 t.export = function(a, b, c = 0, e = 0) {
   if (c < this.field.length) {
     const g = this.field[c];
@@ -1690,27 +1688,23 @@ t.export = function(a, b, c = 0, e = 0) {
   switch(e) {
     case 0:
       d = "reg";
-      f = xa(this.reg);
+      f = wa(this.reg);
       b = null;
       break;
     case 1:
       d = "tag";
-      f = va(this.tag, this.reg.size);
+      f = this.tag && ua(this.tag, this.reg.size);
       b = null;
       break;
     case 2:
       d = "doc";
-      f = ta(this.store);
+      f = this.store && sa(this.store);
       b = null;
       break;
-    case 3:
-      d = "cfg";
-      b = f = null;
-      break;
     default:
       return;
   }
-  return za.call(this, a, b, d, f, c, e);
+  return ya.call(this, a, b, d, f, c, e);
 };
 t.import = function(a, b) {
   var c = a.split(".");
@@ -1728,7 +1722,7 @@ t.import = function(a, b) {
     switch(c) {
       case "reg":
         this.fastupdate = !1;
-        this.reg = ya(b, this.reg);
+        this.reg = xa(b, this.reg);
         for (let d = 0, f; d < this.field.length; d++) {
           f = this.index.get(this.field[d]), f.fastupdate = !1, f.reg = this.reg;
         }
@@ -1741,15 +1735,15 @@ t.import = function(a, b) {
         }
         break;
       case "tag":
-        this.tag = wa(b, this.tag);
+        this.tag = va(b, this.tag);
         break;
       case "doc":
-        this.store = ua(b, this.store);
+        this.store = ta(b, this.store);
     }
   }
 };
 la(V.prototype);
-function Va(a, b, c) {
+function Ua(a, b, c) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
   this.cache || (this.cache = new Y());
   let e = this.cache.get(a);
@@ -1790,31 +1784,31 @@ Y.prototype.clear = function() {
   this.cache.clear();
   this.h = "";
 };
-const Wa = {normalize:function(a) {
+const Va = {normalize:function(a) {
   return a.toLowerCase();
 }};
-const Xa = 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 Ya = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), Za = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
-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 Wa = 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 Xa = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), Ya = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
+const Za = {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 $a = /[\x00-\x7F]+/g;
 const ab = /[\x00-\x7F]+/g;
 const bb = /[\x00-\x7F]+/g;
-const cb = /[\x00-\x7F]+/g;
-var db = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:Wa, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:Xa}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:Xa, matcher:Ya, replacer:Za}, LatinExtra:{normalize:!0, dedupe:!0, mapper:Xa, replacer:Za.concat([/(?!^)[aeo]/g, ""]), matcher:Ya}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
+var cb = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:Va, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:Wa}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:Wa, matcher:Xa, replacer:Ya}, LatinExtra:{normalize:!0, dedupe:!0, mapper:Wa, replacer:Ya.concat([/(?!^)[aeo]/g, ""]), matcher:Xa}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
   for (let c = 0; c < a.length; c++) {
     var b = a[c];
-    let e = b.charAt(0), d = $a[e];
-    for (let f = 1, g; f < b.length && (g = b.charAt(f), "h" === g || "w" === g || !(g = $a[g]) || g === d || (e += g, d = g, 4 !== e.length)); f++) {
+    let e = b.charAt(0), d = Za[e];
+    for (let f = 1, g; f < b.length && (g = b.charAt(f), "h" === g || "w" === g || !(g = Za[g]) || g === d || (e += g, d = g, 4 !== e.length)); f++) {
     }
     a[c] = e;
   }
 }}, ArabicDefault:{rtl:!0, normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(ab, " ");
+  return ("" + a).replace($a, " ");
 }}, CjkDefault:{normalize:!1, dedupe:!0, split:"", prepare:function(a) {
-  return ("" + a).replace(bb, "");
+  return ("" + a).replace(ab, "");
 }}, CyrillicDefault:{normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(cb, " ");
+  return ("" + a).replace(bb, " ");
 }}};
-const eb = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
+const db = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
 O.prototype.add = function(a, b, c, e) {
   if (b && (a || 0 === a)) {
     if (!e && !c && this.reg.has(a)) {
@@ -1827,15 +1821,15 @@ O.prototype.add = function(a, b, c, e) {
         let r = b[this.rtl ? e - 1 - p : p];
         var d = r.length;
         if (d && (m || !n[r])) {
-          var f = this.score ? this.score(b, r, p, null, 0) : fb(q, e, p), g = "";
+          var f = this.score ? this.score(b, r, p, null, 0) : eb(q, e, p), g = "";
           switch(this.tokenize) {
             case "full":
               if (2 < d) {
                 for (f = 0; f < d; f++) {
                   for (var k = d; k > f; k--) {
                     g = r.substring(f, k);
-                    var h = this.score ? this.score(b, r, p, g, f) : fb(q, e, p, d, f);
-                    gb(this, n, g, h, a, c);
+                    var h = this.score ? this.score(b, r, p, g, f) : eb(q, e, p, d, f);
+                    fb(this, n, g, h, a, c);
                   }
                 }
                 break;
@@ -1843,24 +1837,24 @@ O.prototype.add = function(a, b, c, e) {
             case "reverse":
               if (1 < d) {
                 for (k = d - 1; 0 < k; k--) {
-                  g = r[k] + g, h = this.score ? this.score(b, r, p, g, k) : fb(q, e, p, d, k), gb(this, n, g, h, a, c);
+                  g = r[k] + g, h = this.score ? this.score(b, r, p, g, k) : eb(q, e, p, d, k), fb(this, n, g, h, a, c);
                 }
                 g = "";
               }
             case "forward":
               if (1 < d) {
                 for (k = 0; k < d; k++) {
-                  g += r[k], gb(this, n, g, f, a, c);
+                  g += r[k], fb(this, n, g, f, a, c);
                 }
                 break;
               }
             default:
-              if (gb(this, n, r, f, a, c), m && 1 < e && p < e - 1) {
+              if (fb(this, n, r, f, a, c), m && 1 < e && p < e - 1) {
                 for (d = B(), g = this.U, f = r, k = Math.min(m + 1, e - p), d[f] = 1, h = 1; h < k; h++) {
                   if ((r = b[this.rtl ? e - 1 - p - h : p + h]) && !d[r]) {
                     d[r] = 1;
-                    const u = this.score ? this.score(b, f, p, r, h) : fb(g + (e / 2 > g ? 0 : 1), e, p, k - 1, h - 1), v = this.bidirectional && r > f;
-                    gb(this, l, v ? f : r, u, a, c, v ? r : f);
+                    const u = this.score ? this.score(b, f, p, r, h) : eb(g + (e / 2 > g ? 0 : 1), e, p, k - 1, h - 1), v = this.bidirectional && r > f;
+                    fb(this, l, v ? f : r, u, a, c, v ? r : f);
                   }
                 }
               }
@@ -1872,10 +1866,10 @@ O.prototype.add = function(a, b, c, e) {
       b = "";
     }
   }
-  this.db && (b || this.commit_task.push({del:a}), this.T && hb(this));
+  this.db && (b || this.commit_task.push({del:a}), this.T && gb(this));
   return this;
 };
-function gb(a, b, c, e, d, f, g) {
+function fb(a, b, c, e, d, f, g) {
   let k = g ? a.ctx : a.map, h;
   if (!b[c] || g && !(h = b[c])[g]) {
     if (g ? (b = h || (b[c] = B()), b[g] = 1, (h = k.get(g)) ? k = h : k.set(g, k = new Map())) : b[c] = 1, (h = k.get(c)) ? k = h : k.set(c, k = h = []), k = k[e] || (k[e] = []), !f || !k.includes(d)) {
@@ -1893,7 +1887,7 @@ function gb(a, b, c, e, d, f, g) {
     }
   }
 }
-function fb(a, b, c, e, d) {
+function eb(a, b, c, e, d) {
   return c && 1 < a ? b + (e || 0) <= a ? c + (d || 0) : (a - 1) / (b + (e || 0)) * (c + (d || 0)) + 1 | 0 : 0;
 }
 ;O.prototype.search = function(a, b, c) {
@@ -1904,11 +1898,11 @@ function fb(a, b, c, e, d) {
   d = p.length;
   b = b || (h ? 100 : 0);
   if (1 === d) {
-    return ib.call(this, p[0], "", b, k, h, q, l);
+    return hb.call(this, p[0], "", b, k, h, q, l);
   }
   f = this.depth && !1 !== f;
   if (2 === d && f && !g) {
-    return ib.call(this, p[0], p[1], b, k, h, q, l);
+    return hb.call(this, p[0], p[1], b, k, h, q, l);
   }
   let r = B(), u = 0, v;
   1 < d && f && (v = p[0], u = 1);
@@ -1922,8 +1916,8 @@ function fb(a, b, c, e, d) {
       for (let y, F; u < d; u++) {
         if ((F = p[u]) && !r[F]) {
           r[F] = 1;
-          y = await jb(x, F, v, 0, 0, !1, !1);
-          if (y = kb(y, e, g, m)) {
+          y = await ib(x, F, v, 0, 0, !1, !1);
+          if (y = jb(y, e, g, m)) {
             e = y;
             break;
           }
@@ -1931,14 +1925,14 @@ function fb(a, b, c, e, d) {
         }
         g && v && u === d - 1 && !e.length && (v = "", u = -1, r = B());
       }
-      return lb(e, m, b, k, g, n, h);
+      return kb(e, m, b, k, g, n, h);
     }();
   }
   for (let x, y; u < d; u++) {
     if ((y = p[u]) && !r[y]) {
       r[y] = 1;
-      x = jb(this, y, v, 0, 0, !1, !1);
-      if (x = kb(x, e, g, m)) {
+      x = ib(this, y, v, 0, 0, !1, !1);
+      if (x = jb(x, e, g, m)) {
         e = x;
         break;
       }
@@ -1946,24 +1940,24 @@ function fb(a, b, c, e, d) {
     }
     g && v && u === d - 1 && !e.length && (v = "", u = -1, r = B());
   }
-  return lb(e, m, b, k, g, n, h);
+  return kb(e, m, b, k, g, n, h);
 };
-function lb(a, b, c, e, d, f, g) {
+function kb(a, b, c, e, d, f, g) {
   let k = a.length, h = a;
   if (1 < k) {
-    h = Fa(a, b, c, e, d, f, g);
+    h = Ea(a, b, c, e, d, f, g);
   } else if (1 === k) {
-    return g ? Ia.call(null, a[0], c, e) : new X(a[0]);
+    return g ? Ha.call(null, a[0], c, e) : new X(a[0]);
   }
   return g ? h : new X(h);
 }
-function ib(a, b, c, e, d, f, g) {
-  a = jb(this, a, b, c, e, d, f, g);
+function hb(a, b, c, e, d, f, g) {
+  a = ib(this, a, b, c, e, d, f, g);
   return this.db ? a.then(function(k) {
     return d ? k || [] : new X(k);
-  }) : a && a.length ? d ? Ia.call(this, a, c, e) : new X(a) : d ? [] : new X();
+  }) : a && a.length ? d ? Ha.call(this, a, c, e) : new X(a) : d ? [] : new X();
 }
-function kb(a, b, c, e) {
+function jb(a, b, c, e) {
   let d = [];
   if (a && a.length) {
     if (a.length <= e) {
@@ -1984,7 +1978,7 @@ function kb(a, b, c, e) {
     return d;
   }
 }
-function jb(a, b, c, e, d, f, g, k) {
+function ib(a, b, c, e, d, f, g, k) {
   let h;
   c && (h = a.bidirectional && b > c) && (h = c, c = b, b = h);
   if (a.db) {
@@ -2008,15 +2002,15 @@ function jb(a, b, c, e, d, f, g, k) {
         }
       }
     } else {
-      mb(this.map, a), this.depth && mb(this.ctx, a);
+      lb(this.map, a), this.depth && lb(this.ctx, a);
     }
     b || this.reg.delete(a);
   }
-  this.db && (this.commit_task.push({del:a}), this.T && hb(this));
+  this.db && (this.commit_task.push({del:a}), this.T && gb(this));
   this.cache && this.cache.remove(a);
   return this;
 };
-function mb(a, b) {
+function lb(a, b) {
   let c = 0;
   if (a.constructor === Array) {
     for (let e = 0, d, f; e < a.length; e++) {
@@ -2031,7 +2025,7 @@ function mb(a, b) {
     }
   } else {
     for (let e of a.entries()) {
-      const d = e[0], f = mb(e[1], b);
+      const d = e[0], f = lb(e[1], b);
       f ? c += f : a.delete(d);
     }
   }
@@ -2043,12 +2037,12 @@ function mb(a, b) {
   }
   if (a) {
     var c = E(a) ? a : a.preset;
-    c && (eb[c] || console.warn("Preset not found: " + c), a = Object.assign({}, eb[c], a));
+    c && (db[c] || console.warn("Preset not found: " + c), a = Object.assign({}, db[c], a));
   } else {
     a = {};
   }
   c = a.context;
-  const e = !0 === c ? {depth:1} : c || {}, d = E(a.encoder) ? db[a.encoder] : a.encode || a.encoder || Wa;
+  const e = !0 === c ? {depth:1} : c || {}, d = E(a.encoder) ? cb[a.encoder] : a.encode || a.encoder || Va;
   this.encoder = d.encode ? d : "object" === typeof d ? new J(d) : {encode:d};
   this.resolution = a.resolution || 9;
   this.tokenize = (c = a.tokenize) && "default" !== c && c || "strict";
@@ -2085,11 +2079,11 @@ t.destroy = function() {
   this.commit_timer && (clearTimeout(this.commit_timer), this.commit_timer = null);
   return this.db.destroy();
 };
-function hb(a) {
+function gb(a) {
   a.commit_timer || (a.commit_timer = setTimeout(function() {
     a.commit_timer = null;
     a.db.commit(a, void 0, void 0);
-  }, 0));
+  }, 1));
 }
 t.clear = function() {
   this.map.clear();
@@ -2109,7 +2103,7 @@ t.update = function(a, b) {
   const c = this, e = this.remove(a);
   return e && e.then ? e.then(() => c.add(a, b)) : this.add(a, b);
 };
-function nb(a) {
+function mb(a) {
   let b = 0;
   if (a.constructor === Array) {
     for (let c = 0, e; c < a.length; c++) {
@@ -2117,7 +2111,7 @@ function nb(a) {
     }
   } else {
     for (const c of a) {
-      const e = c[0], d = nb(c[1]);
+      const e = c[0], d = mb(c[1]);
       d ? b += d : a.delete(e);
     }
   }
@@ -2127,17 +2121,17 @@ t.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
-  nb(this.map);
-  this.depth && nb(this.ctx);
+  mb(this.map);
+  this.depth && mb(this.ctx);
   return this;
 };
-t.searchCache = Va;
+t.searchCache = Ua;
 t.export = function(a, b, c = 0, e = 0) {
   let d, f;
   switch(e) {
     case 0:
       d = "reg";
-      f = xa(this.reg);
+      f = wa(this.reg);
       break;
     case 1:
       d = "cfg";
@@ -2145,29 +2139,29 @@ t.export = function(a, b, c = 0, e = 0) {
       break;
     case 2:
       d = "map";
-      f = ta(this.map, this.reg.size);
+      f = sa(this.map, this.reg.size);
       break;
     case 3:
       d = "ctx";
-      f = va(this.ctx, this.reg.size);
+      f = ua(this.ctx, this.reg.size);
       break;
     default:
       return;
   }
-  return za.call(this, a, b, d, f, c, e);
+  return ya.call(this, a, b, d, f, c, e);
 };
 t.import = function(a, b) {
   if (b) {
     switch("string" === typeof b && (b = JSON.parse(b)), a = a.split("."), "json" === a[a.length - 1] && a.pop(), 3 === a.length && a.shift(), a = 1 < a.length ? a[1] : a[0], a) {
       case "reg":
         this.fastupdate = !1;
-        this.reg = ya(b, this.reg);
+        this.reg = xa(b, this.reg);
         break;
       case "map":
-        this.map = ua(b, this.map);
+        this.map = ta(b, this.map);
         break;
       case "ctx":
-        this.ctx = wa(b, this.ctx);
+        this.ctx = va(b, this.ctx);
     }
   }
 };
@@ -2222,10 +2216,10 @@ t.serialize = function(a = !0) {
   return a ? "function inject(index){" + b + e + d + "}" : b + e + d;
 };
 la(O.prototype);
-const ob = "undefined" !== typeof window && (window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB), pb = ["map", "ctx", "tag", "reg", "cfg"];
-function qb(a, b = {}) {
+const nb = "undefined" !== typeof window && (window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB), ob = ["map", "ctx", "tag", "reg", "cfg"];
+function pb(a, b = {}) {
   if (!this) {
-    return new qb(a, b);
+    return new pb(a, b);
   }
   "object" === typeof a && (b = a, a = a.name);
   a || console.info("Default storage space was used, because a name was not passed.");
@@ -2236,7 +2230,7 @@ function qb(a, b = {}) {
   this.db = null;
   this.h = {};
 }
-t = qb.prototype;
+t = pb.prototype;
 t.mount = function(a) {
   if (!a.encoder) {
     return a.mount(this);
@@ -2248,10 +2242,10 @@ t.open = function() {
   let a = this;
   navigator.storage && navigator.storage.persist();
   return this.db || new Promise(function(b, c) {
-    const e = ob.open(a.id + (a.field ? ":" + a.field : ""), 1);
+    const e = nb.open(a.id + (a.field ? ":" + a.field : ""), 1);
     e.onupgradeneeded = function() {
       const d = a.db = this.result;
-      pb.forEach(f => {
+      ob.forEach(f => {
         d.objectStoreNames.contains(f) || d.createObjectStore(f);
       });
     };
@@ -2277,13 +2271,13 @@ t.close = function() {
   this.db = null;
 };
 t.destroy = function() {
-  const a = ob.deleteDatabase(this.id + (this.field ? ":" + this.field : ""));
+  const a = nb.deleteDatabase(this.id + (this.field ? ":" + this.field : ""));
   return Z(a);
 };
 t.clear = function() {
-  const a = this.db.transaction(pb, "readwrite");
-  for (let b = 0; b < pb.length; b++) {
-    a.objectStore(pb[b]).clear();
+  const a = this.db.transaction(ob, "readwrite");
+  for (let b = 0; b < ob.length; b++) {
+    a.objectStore(ob[b]).clear();
   }
   return Z(a);
 };
@@ -2468,7 +2462,7 @@ t.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 sb(a, b, c) {
+function rb(a, b, c) {
   const e = a.value;
   let d, f, g = 0;
   for (let k = 0, h; k < e.length; k++) {
@@ -2497,17 +2491,17 @@ t.remove = function(a) {
   return Promise.all([this.transaction("map", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       const c = this.result;
-      c && sb(c, a);
+      c && rb(c, a);
     };
   }), this.transaction("ctx", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       const c = this.result;
-      c && sb(c, a);
+      c && rb(c, a);
     };
   }), this.transaction("tag", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       const c = this.result;
-      c && sb(c, a, !0);
+      c && rb(c, a, !0);
     };
   }), this.transaction("reg", "readwrite", function(b) {
     for (let c = 0; c < a.length; c++) {
@@ -2527,9 +2521,9 @@ function Z(a) {
     a = null;
   });
 }
-;const tb = {Index:O, Charset:db, Encoder:J, Document:V, Worker:Q, Resolver:X, IndexedDB:qb, Language:{}}, ub = "undefined" !== typeof self ? self : "undefined" !== typeof global ? global : "undefined" !== typeof window ? window : {};
-let vb;
-(vb = ub.define) && vb.amd ? vb([], function() {
-  return tb;
-}) : "object" === typeof ub.exports ? ub.exports = tb : ub.FlexSearch = tb;
+;const sb = {Index:O, Charset:cb, Encoder:J, Document:V, Worker:Q, Resolver:X, IndexedDB:pb, Language:{}}, tb = "undefined" !== typeof self ? self : "undefined" !== typeof global ? global : "undefined" !== typeof window ? window : {};
+let ub;
+(ub = tb.define) && ub.amd ? ub([], function() {
+  return sb;
+}) : "object" === typeof tb.exports ? tb.exports = sb : tb.FlexSearch = sb;
 }(this||self));
diff --git a/dist/flexsearch.bundle.min.js b/dist/flexsearch.bundle.min.js
index 6583bf6..142b48e 100644
--- a/dist/flexsearch.bundle.min.js
+++ b/dist/flexsearch.bundle.min.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.115 (Bundle)
+ * FlexSearch.js v0.8.117 (Bundle)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -21,73 +21,73 @@ t.addMatcher=function(a,b){if("object"===typeof a)return this.addReplacer(a,b);i
 t.encode=function(a){if(this.cache&&a.length<=this.K)if(this.H){if(this.B.has(a))return this.B.get(a)}else this.H=setTimeout(L,50,this);this.normalize&&("function"===typeof this.normalize?a=this.normalize(a):a=ja?a.normalize("NFKD").replace(ja,"").toLowerCase():a.toLowerCase());this.prepare&&(a=this.prepare(a));this.numeric&&3<a.length&&(a=a.replace(ha,"$1 $2").replace(ia,"$1 $2").replace(fa,"$1 "));const b=!(this.dedupe||this.mapper||this.filter||this.matcher||this.stemmer||this.replacer);let c=
 [],e=this.split||""===this.split?a.split(this.split):a;for(let f=0,g,k;f<e.length;f++)if((g=k=e[f])&&!(g.length<this.minlength))if(b)c.push(g);else if(!this.filter||!this.filter.has(g)){if(this.cache&&g.length<=this.L)if(this.H){var d=this.G.get(g);if(d||""===d){d&&c.push(d);continue}}else this.H=setTimeout(L,50,this);this.stemmer&&2<g.length&&(this.N||(this.N=new RegExp("(?!^)("+this.A+")$")),g=g.replace(this.N,h=>this.stemmer.get(h)),g.length<this.minlength||this.filter&&this.filter.has(g))&&(g=
 "");if(g&&(this.mapper||this.dedupe&&1<g.length)){d="";for(let h=0,l="",n,m;h<g.length;h++)n=g.charAt(h),n===l&&this.dedupe||((m=this.mapper&&this.mapper.get(n))||""===m?m===l&&this.dedupe||!(l=m)||(d+=m):d+=l=n);g=d}this.matcher&&1<g.length&&(this.M||(this.M=new RegExp("("+this.h+")","g")),g=g.replace(this.M,h=>this.matcher.get(h)));if(g&&this.replacer)for(d=0;g&&d<this.replacer.length;d+=2)g=g.replace(this.replacer[d],this.replacer[d+1]);this.cache&&k.length<=this.L&&(this.G.set(k,g),this.G.size>
-this.S&&(this.G.clear(),this.L=this.L/1.1|0));g&&c.push(g)}this.finalize&&(c=this.finalize(c)||c);this.cache&&a.length<=this.K&&(this.B.set(a,c),this.B.size>this.S&&(this.B.clear(),this.K=this.K/1.1|0));return c};function L(a){a.H=null;a.B.clear();a.G.clear()};let M,N;async function ka(a){a=a.data;var b=a.task;const c=a.id;let e=a.args;switch(b){case "init":N=a.options||{};(b=a.factory)?(Function("return "+b)()(self),M=new self.FlexSearch.Index(N),delete self.FlexSearch):M=new O(N);postMessage({id:c});break;default:let d;"export"===b&&(e[1]?(e[0]=N.export,e[2]=0,e[3]=1):e=null);"import"===b?e[0]&&(a=await N.import.call(M,e[0]),M.import(e[0],a)):(d=e&&M[b].apply(M,e))&&d.then&&(d=await d);postMessage("search"===b?{id:c,msg:d}:{id:c})}};function la(a){P.call(a,"add");P.call(a,"append");P.call(a,"search");P.call(a,"update");P.call(a,"remove")}let ma,na;const oa={},pa={};function qa(a){ma=0;oa[a]=pa[a]}
-function P(a){this[a+"Async"]=function(){const b=arguments;var c=b[b.length-1];let e;"function"===typeof c&&(e=c,delete b[b.length-1]);ma||(ma=setTimeout(qa,0,a),na=Date.now());pa[a]||(pa[a]=oa[a]=1E3);if(!--oa[a]){oa[a]=pa[a]=pa[a]*this.priority*this.priority*3/(Date.now()-na)|0||1;ma=clearTimeout(ma);const f=this;return new Promise(g=>{setTimeout(function(){g(f[a+"Async"].apply(f,b))},0)})}const d=this[a].apply(this,b);c=d.then?d:new Promise(f=>f(d));e&&c.then(e);return c}};let ra=0;
-function Q(a={}){function b(g){function k(h){h=h.data||h;const l=h.id,n=l&&d.h[l];n&&(n(h.msg),delete d.h[l])}this.worker=g;this.h=B();if(this.worker){e?this.worker.on("message",k):this.worker.onmessage=k;if(a.config)return new Promise(function(h){d.h[++ra]=function(){h(d)};d.worker.postMessage({id:ra,task:"init",factory:c,options:a})});this.worker.postMessage({task:"init",factory:c,options:a});return this}}if(!this||this.constructor!==Q)return new Q(a);let c="undefined"!==typeof self?self._factory:"undefined"!==
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-function za(a,b,c,e,d,f,g=0){const k=e&&e.constructor===Array;var h=k?e.shift():e;if(!h)return this.export(a,b,d,f+1);if((h=a((b?b+".":"")+(g+1)+"."+c,JSON.stringify(h)))&&h.then){const l=this;return h.then(function(){return za.call(l,a,b,c,k?e:null,d,f,g+1)})}return za.call(this,a,b,c,k?e:null,d,f,g+1)};function Aa(a,b,c,e){let d=[];for(let f=0,g;f<a.index.length;f++)if(g=a.index[f],b>=g.length)b-=g.length;else{b=g[e?"splice":"slice"](b,c);const k=b.length;if(k&&(d=d.length?d.concat(b):b,c-=k,e&&(a.length-=k),!c))break;b=0}return d}
+this.S&&(this.G.clear(),this.L=this.L/1.1|0));g&&c.push(g)}this.finalize&&(c=this.finalize(c)||c);this.cache&&a.length<=this.K&&(this.B.set(a,c),this.B.size>this.S&&(this.B.clear(),this.K=this.K/1.1|0));return c};function L(a){a.H=null;a.B.clear();a.G.clear()};let M,N;async function ka(a){a=a.data;var b=a.task;const c=a.id;let e=a.args;switch(b){case "init":N=a.options||{};(b=a.factory)?(Function("return "+b)()(self),M=new self.FlexSearch.Index(N),delete self.FlexSearch):M=new O(N);postMessage({id:c});break;default:let d;"export"===b&&(e[1]?(e[0]=N.export,e[2]=0,e[3]=1):e=null);"import"===b?e[0]&&(a=await N.import.call(M,e[0]),M.import(e[0],a)):(d=e&&M[b].apply(M,e))&&d.then&&(d=await d);postMessage("search"===b?{id:c,msg:d}:{id:c})}};function la(a){ma.call(a,"add");ma.call(a,"append");ma.call(a,"search");ma.call(a,"update");ma.call(a,"remove")}let na,oa,pa;function qa(){na=pa=0}
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+this.resolution);if(this.db){if(this.db.search&&(a=this.db.search(this,p,b,k,g,h,q,l),!1!==a))return a;const x=this;return async function(){for(let y,F;u<d;u++){if((F=p[u])&&!r[F]){r[F]=1;y=await ib(x,F,v,0,0,!1,!1);if(y=jb(y,e,g,m)){e=y;break}v&&(g&&y&&e.length||(v=F))}g&&v&&u===d-1&&!e.length&&(v="",u=-1,r=B())}return kb(e,m,b,k,g,n,h)}()}for(let x,y;u<d;u++){if((y=p[u])&&!r[y]){r[y]=1;x=ib(this,y,v,0,0,!1,!1);if(x=jb(x,e,g,m)){e=x;break}v&&(g&&x&&e.length||(v=y))}g&&v&&u===d-1&&!e.length&&(v="",
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+function jb(a,b,c,e){let d=[];if(a&&a.length){if(a.length<=e){b.push(a);return}for(let f=0,g;f<e;f++)if(g=a[f])d[f]=g;if(d.length){b.push(d);return}}if(!c)return d}function ib(a,b,c,e,d,f,g,k){let h;c&&(h=a.bidirectional&&b>c)&&(h=c,c=b,b=h);if(a.db)return a.db.get(b,c,e,d,f,g,k);a=c?(a=a.ctx.get(c))&&a.get(b):a.map.get(b);return a};O.prototype.remove=function(a,b){const c=this.reg.size&&(this.fastupdate?this.reg.get(a):this.reg.has(a));if(c){if(this.fastupdate)for(let e=0,d;e<c.length;e++){if(d=c[e])if(2>d.length)d.pop();else{const f=d.indexOf(a);f===c.length-1?d.pop():d.splice(f,1)}}else lb(this.map,a),this.depth&&lb(this.ctx,a);b||this.reg.delete(a)}this.db&&(this.commit_task.push({del:a}),this.T&&gb(this));this.cache&&this.cache.remove(a);return this};
+function lb(a,b){let c=0;if(a.constructor===Array)for(let e=0,d,f;e<a.length;e++){if((d=a[e])&&d.length)if(f=d.indexOf(b),0<=f){1<d.length?(d.splice(f,1),c++):delete a[e];break}else c++}else for(let e of a.entries()){const d=e[0],f=lb(e[1],b);f?c+=f:a.delete(d)}return c};function O(a,b){if(!this||this.constructor!==O)return new O(a);if(a){var c=E(a)?a:a.preset;c&&(a=Object.assign({},db[c],a))}else a={};c=a.context;const e=!0===c?{depth:1}:c||{},d=E(a.encoder)?cb[a.encoder]:a.encode||a.encoder||Va;this.encoder=d.encode?d:"object"===typeof d?new J(d):{encode:d};this.resolution=a.resolution||9;this.tokenize=(c=a.tokenize)&&"default"!==c&&c||"strict";this.depth="strict"===c&&e.depth||0;this.bidirectional=!1!==e.bidirectional;this.fastupdate=!!a.fastupdate;this.score=
 a.score||null;(c=a.keystore||0)&&(this.keystore=c);this.map=c?new T(c):new Map;this.ctx=c?new T(c):new Map;this.reg=b||(this.fastupdate?c?new T(c):new Map:c?new U(c):new Set);this.U=e.resolution||3;this.rtl=d.rtl||a.rtl||!1;this.cache=(c=a.cache||null)&&new Y(c);this.resolve=!1!==a.resolve;if(c=a.db)this.db=this.mount(c);this.T=!1!==a.commit;this.commit_task=[];this.commit_timer=null;this.priority=a.priority||4}t=O.prototype;
-t.mount=function(a){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return a.mount(this)};t.commit=function(a,b){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return this.db.commit(this,a,b)};t.destroy=function(){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return this.db.destroy()};function hb(a){a.commit_timer||(a.commit_timer=setTimeout(function(){a.commit_timer=null;a.db.commit(a,void 0,void 0)},0))}
+t.mount=function(a){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return a.mount(this)};t.commit=function(a,b){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return this.db.commit(this,a,b)};t.destroy=function(){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return this.db.destroy()};function gb(a){a.commit_timer||(a.commit_timer=setTimeout(function(){a.commit_timer=null;a.db.commit(a,void 0,void 0)},1))}
 t.clear=function(){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}]);return this};t.append=function(a,b){return this.add(a,b,!0)};t.contain=function(a){return this.db?this.db.has(a):this.reg.has(a)};t.update=function(a,b){const c=this,e=this.remove(a);return e&&e.then?e.then(()=>c.add(a,b)):this.add(a,b)};
-function nb(a){let b=0;if(a.constructor===Array)for(let c=0,e;c<a.length;c++)(e=a[c])&&(b+=e.length);else for(const c of a){const e=c[0],d=nb(c[1]);d?b+=d:a.delete(e)}return b}t.cleanup=function(){if(!this.fastupdate)return this;nb(this.map);this.depth&&nb(this.ctx);return this};t.searchCache=Va;
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-t.import=function(a,b){if(b)switch("string"===typeof b&&(b=JSON.parse(b)),a=a.split("."),"json"===a[a.length-1]&&a.pop(),3===a.length&&a.shift(),a=1<a.length?a[1]:a[0],a){case "reg":this.fastupdate=!1;this.reg=ya(b,this.reg);break;case "map":this.map=ua(b,this.map);break;case "ctx":this.ctx=wa(b,this.ctx)}};
+function mb(a){let b=0;if(a.constructor===Array)for(let c=0,e;c<a.length;c++)(e=a[c])&&(b+=e.length);else for(const c of a){const e=c[0],d=mb(c[1]);d?b+=d:a.delete(e)}return b}t.cleanup=function(){if(!this.fastupdate)return this;mb(this.map);this.depth&&mb(this.ctx);return this};t.searchCache=Ua;
+t.export=function(a,b,c=0,e=0){let d,f;switch(e){case 0:d="reg";f=wa(this.reg);break;case 1:d="cfg";f=null;break;case 2:d="map";f=sa(this.map,this.reg.size);break;case 3:d="ctx";f=ua(this.ctx,this.reg.size);break;default:return}return ya.call(this,a,b,d,f,c,e)};
+t.import=function(a,b){if(b)switch("string"===typeof b&&(b=JSON.parse(b)),a=a.split("."),"json"===a[a.length-1]&&a.pop(),3===a.length&&a.shift(),a=1<a.length?a[1]:a[0],a){case "reg":this.fastupdate=!1;this.reg=xa(b,this.reg);break;case "map":this.map=ta(b,this.map);break;case "ctx":this.ctx=va(b,this.ctx)}};
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-function rb(a,b={}){if(!this)return new rb(a,b);"object"===typeof a&&(b=a,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.type=b.type;this.fastupdate=this.support_tag_search=!1;this.db=null;this.h={}}t=rb.prototype;t.mount=function(a){if(!a.encoder)return a.mount(this);a.db=this;return this.open()};
-t.open=function(){let a=this;navigator.storage&&navigator.storage.persist();return this.db||new Promise(function(b,c){const e=ob.open(a.id+(a.field?":"+a.field:""),1);e.onupgradeneeded=function(){const d=a.db=this.result;pb.forEach(f=>{d.objectStoreNames.contains(f)||d.createObjectStore(f)})};e.onblocked=function(d){console.error("blocked",d);c()};e.onerror=function(d){console.error(this.error,d);c()};e.onsuccess=function(){a.db=this.result;a.db.onversionchange=function(){a.close()};b(a)}})};
-t.close=function(){this.db.close();this.db=null};t.destroy=function(){const a=ob.deleteDatabase(this.id+(this.field?":"+this.field:""));return Z(a)};t.clear=function(){const a=this.db.transaction(pb,"readwrite");for(let b=0;b<pb.length;b++)a.objectStore(pb[b]).clear();return Z(a)};
+n[0];g=n[1];for(const m of g.entries()){g=m[0];k=m[1];h="";for(let q=0,p;q<k.length;q++){p=k[q]||[""];l="";for(let r=0;r<p.length;r++)l+=(l?",":"")+("string"===c?'"'+p[r]+'"':p[r]);l="["+l+"]";h+=(h?",":"")+l}h='new Map([["'+g+'",['+h+"]]])";h='["'+f+'",'+h+"]";d+=(d?",":"")+h}}d="index.ctx=new Map(["+d+"]);";return a?"function inject(index){"+b+e+d+"}":b+e+d};la(O.prototype);const nb="undefined"!==typeof window&&(window.indexedDB||window.mozIndexedDB||window.webkitIndexedDB||window.msIndexedDB),ob=["map","ctx","tag","reg","cfg"];
+function qb(a,b={}){if(!this)return new qb(a,b);"object"===typeof a&&(b=a,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.type=b.type;this.fastupdate=this.support_tag_search=!1;this.db=null;this.h={}}t=qb.prototype;t.mount=function(a){if(!a.encoder)return a.mount(this);a.db=this;return this.open()};
+t.open=function(){let a=this;navigator.storage&&navigator.storage.persist();return this.db||new Promise(function(b,c){const e=nb.open(a.id+(a.field?":"+a.field:""),1);e.onupgradeneeded=function(){const d=a.db=this.result;ob.forEach(f=>{d.objectStoreNames.contains(f)||d.createObjectStore(f)})};e.onblocked=function(d){console.error("blocked",d);c()};e.onerror=function(d){console.error(this.error,d);c()};e.onsuccess=function(){a.db=this.result;a.db.onversionchange=function(){a.close()};b(a)}})};
+t.close=function(){this.db.close();this.db=null};t.destroy=function(){const a=nb.deleteDatabase(this.id+(this.field?":"+this.field:""));return Z(a)};t.clear=function(){const a=this.db.transaction(ob,"readwrite");for(let b=0;b<ob.length;b++)a.objectStore(ob[b]).clear();return Z(a)};
 t.get=function(a,b,c=0,e=0,d=!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(k){let h=[];if(!k||!k.length)return h;if(d){if(!c&&!e&&1===k.length)return k[0];for(let l=0,n;l<k.length;l++)if((n=k[l])&&n.length){if(e>=n.length){e-=n.length;continue}const m=c?e+Math.min(n.length-e,c):n.length;for(let q=e;q<m;q++)h.push(n[q]);e=0;if(h.length===c)break}return f?g.enrich(h):h}return k})};
 t.tag=function(a,b=0,c=0,e=!1){a=this.db.transaction("tag","readonly").objectStore("tag").get(a);const d=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 e?d.enrich(f):f})};
 t.enrich=function(a){"object"!==typeof a&&(a=[a]);const b=this.db.transaction("reg","readonly").objectStore("reg"),c=[];for(let e=0;e<a.length;e++)c[e]=Z(b.get(a[e]));return Promise.all(c).then(function(e){for(let d=0;d<e.length;d++)e[d]={id:a[d],doc:e[d]?JSON.parse(e[d]):null};return e})};t.has=function(a){a=this.db.transaction("reg","readonly").objectStore("reg").getKey(a);return Z(a)};t.search=null;t.info=function(){};
@@ -96,6 +96,6 @@ t.commit=async function(a,b,c){if(b)await this.clear(),a.commit_task=[];else{let
 for(let n=0,m,q;n<l;n++)if((q=g[n])&&q.length){if((m=k[n])&&m.length)for(h=0;h<q.length;h++)m.push(q[h]);else k[n]=q;h=1}}else k=g,h=1;h&&e.put(k,f)})}}),await this.transaction("ctx","readwrite",function(e){for(const d of a.ctx){const f=d[0],g=d[1];for(const k of g){const h=k[0],l=k[1];l.length&&(b?e.put(l,f+":"+h):e.get(f+":"+h).onsuccess=function(){let n=this.result;var m;if(n&&n.length){const q=Math.max(n.length,l.length);for(let p=0,r,u;p<q;p++)if((u=l[p])&&u.length){if((r=n[p])&&r.length)for(m=
 0;m<u.length;m++)r.push(u[m]);else n[p]=u;m=1}}else n=l,m=1;m&&e.put(n,f+":"+h)})}}}),a.store?await this.transaction("reg","readwrite",function(e){for(const d of a.store){const f=d[0],g=d[1];e.put("object"===typeof g?JSON.stringify(g):1,f)}}):a.bypass||await this.transaction("reg","readwrite",function(e){for(const d of a.reg.keys())e.put(1,d)}),a.tag&&await this.transaction("tag","readwrite",function(e){for(const d of a.tag){const f=d[0],g=d[1];g.length&&(e.get(f).onsuccess=function(){let k=this.result;
 k=k&&k.length?k.concat(g):g;e.put(k,f)})}}),a.map.clear(),a.ctx.clear(),a.tag&&a.tag.clear(),a.store&&a.store.clear(),a.document||a.reg.clear())};
-function sb(a,b,c){const e=a.value;let d,f,g=0;for(let k=0,h;k<e.length;k++){if(h=c?e:e[k]){for(let l=0,n,m;l<b.length;l++)if(m=b[l],n=h.indexOf(f?parseInt(m,10):m),0>n&&!f&&"string"===typeof m&&!isNaN(m)&&(n=h.indexOf(parseInt(m,10)))&&(f=1),0<=n)if(d=1,1<h.length)h.splice(n,1);else{e[k]=[];break}g+=h.length}if(c)break}g?d&&a.update(e):a.delete();a.continue()}
-t.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&&sb(c,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&sb(c,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&sb(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 tb={Index:O,Charset:db,Encoder:J,Document:V,Worker:Q,Resolver:X,IndexedDB:rb,Language:{}},ub="undefined"!==typeof self?self:"undefined"!==typeof global?global:"undefined"!==typeof window?window:{};let vb;(vb=ub.define)&&vb.amd?vb([],function(){return tb}):"object"===typeof ub.exports?ub.exports=tb:ub.FlexSearch=tb;}(this||self));
+function rb(a,b,c){const e=a.value;let d,f,g=0;for(let k=0,h;k<e.length;k++){if(h=c?e:e[k]){for(let l=0,n,m;l<b.length;l++)if(m=b[l],n=h.indexOf(f?parseInt(m,10):m),0>n&&!f&&"string"===typeof m&&!isNaN(m)&&(n=h.indexOf(parseInt(m,10)))&&(f=1),0<=n)if(d=1,1<h.length)h.splice(n,1);else{e[k]=[];break}g+=h.length}if(c)break}g?d&&a.update(e):a.delete();a.continue()}
+t.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&&rb(c,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&rb(c,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&rb(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 sb={Index:O,Charset:cb,Encoder:J,Document:V,Worker:Q,Resolver:X,IndexedDB:qb,Language:{}},tb="undefined"!==typeof self?self:"undefined"!==typeof global?global:"undefined"!==typeof window?window:{};let ub;(ub=tb.define)&&ub.amd?ub([],function(){return sb}):"object"===typeof tb.exports?tb.exports=sb:tb.FlexSearch=sb;}(this||self));
diff --git a/dist/flexsearch.bundle.module.debug.js b/dist/flexsearch.bundle.module.debug.js
index 30316a2..32e88f3 100644
--- a/dist/flexsearch.bundle.module.debug.js
+++ b/dist/flexsearch.bundle.module.debug.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.115 (Bundle/Module/Debug)
+ * FlexSearch.js v0.8.117 (Bundle/Module/Debug)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -300,29 +300,24 @@ async function ka(a) {
   }
 }
 ;function la(a) {
-  P.call(a, "add");
-  P.call(a, "append");
-  P.call(a, "search");
-  P.call(a, "update");
-  P.call(a, "remove");
+  ma.call(a, "add");
+  ma.call(a, "append");
+  ma.call(a, "search");
+  ma.call(a, "update");
+  ma.call(a, "remove");
 }
-let ma, na;
-const oa = {}, pa = {};
-function qa(a) {
-  ma = 0;
-  oa[a] = pa[a];
+let na, oa, pa;
+function qa() {
+  na = pa = 0;
 }
-function P(a) {
+function ma(a) {
   this[a + "Async"] = function() {
     const b = arguments;
     var c = b[b.length - 1];
     let e;
     "function" === typeof c && (e = c, delete b[b.length - 1]);
-    ma || (ma = setTimeout(qa, 0, a), na = Date.now());
-    pa[a] || (pa[a] = oa[a] = 1000);
-    if (!--oa[a]) {
-      oa[a] = pa[a] = pa[a] * this.priority * this.priority * 3 / (Date.now() - na) | 0 || 1;
-      ma = clearTimeout(ma);
+    na ? pa || (pa = Date.now() - oa >= this.priority * this.priority * 3) : (na = setTimeout(qa, 0), oa = Date.now());
+    if (pa) {
       const f = this;
       return new Promise(g => {
         setTimeout(function() {
@@ -336,7 +331,7 @@ function P(a) {
     return c;
   };
 }
-;let ra = 0;
+;let P = 0;
 function Q(a = {}) {
   function b(g) {
     function k(h) {
@@ -350,13 +345,15 @@ function Q(a = {}) {
       e ? this.worker.on("message", k) : this.worker.onmessage = k;
       if (a.config) {
         return new Promise(function(h) {
-          d.h[++ra] = function() {
+          d.h[++P] = function() {
             h(d);
+            1e9 < P && (P = 0);
           };
-          d.worker.postMessage({id:ra, task:"init", factory:c, options:a});
+          d.worker.postMessage({id:P, task:"init", factory:c, options:a});
         });
       }
       this.worker.postMessage({task:"init", factory:c, options:a});
+      this.priority = a.priority || 4;
       return this;
     }
   }
@@ -365,7 +362,7 @@ function Q(a = {}) {
   }
   let c = "undefined" !== typeof self ? self._factory : "undefined" !== typeof window ? window._factory : null;
   c && (c = c.toString());
-  const e = "undefined" === typeof window, d = this, f = sa(c, e, a.worker);
+  const e = "undefined" === typeof window, d = this, f = ra(c, e, a.worker);
   return f.then ? f.then(function(g) {
     return b.call(d, g);
   }) : b.call(this, f);
@@ -387,17 +384,17 @@ function R(a) {
     "function" === typeof e && (d = e, c.pop());
     e = new Promise(function(f) {
       "export" === a && "function" === typeof c[0] && (c[0] = null);
-      b.h[++ra] = f;
-      b.worker.postMessage({task:a, id:ra, args:c});
+      b.h[++P] = f;
+      b.worker.postMessage({task:a, id:P, args:c});
     });
     return d ? (e.then(d), this) : e;
   };
 }
-function sa(a, b, c) {
+function ra(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"](import.meta.dirname + "/node/node.mjs"); }) : a ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + ka.toString()], {type:"text/javascript"}))) : new window.Worker("string" === typeof c ? c : import.meta.url.replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", 
   "module/worker/worker.js"), {type:"module"});
 }
-;function ta(a, b = 0) {
+;function sa(a, b = 0) {
   let c = [], e = [];
   b && (b = 250000 / b * 5000 | 0);
   for (const d of a.entries()) {
@@ -406,30 +403,30 @@ function sa(a, b, c) {
   e.length && c.push(e);
   return c;
 }
-function ua(a, b) {
+function ta(a, b) {
   b || (b = new Map());
   for (let c = 0, e; c < a.length; c++) {
     e = a[c], b.set(e[0], e[1]);
   }
   return b;
 }
-function va(a, b = 0) {
+function ua(a, b = 0) {
   let c = [], e = [];
   b && (b = 250000 / b * 1000 | 0);
   for (const d of a.entries()) {
-    e.push([d[0], ta(d[1])[0]]), e.length === b && (c.push(e), e = []);
+    e.push([d[0], sa(d[1])[0]]), e.length === b && (c.push(e), e = []);
   }
   e.length && c.push(e);
   return c;
 }
-function wa(a, b) {
+function va(a, b) {
   b || (b = new Map());
   for (let c = 0, e, d; c < a.length; c++) {
-    e = a[c], d = b.get(e[0]), b.set(e[0], ua(e[1], d));
+    e = a[c], d = b.get(e[0]), b.set(e[0], ta(e[1], d));
   }
   return b;
 }
-function xa(a) {
+function wa(a) {
   let b = [], c = [];
   for (const e of a.keys()) {
     c.push(e), 250000 === c.length && (b.push(c), c = []);
@@ -437,14 +434,14 @@ function xa(a) {
   c.length && b.push(c);
   return b;
 }
-function ya(a, b) {
+function xa(a, b) {
   b || (b = new Set());
   for (let c = 0; c < a.length; c++) {
     b.add(a[c]);
   }
   return b;
 }
-function za(a, b, c, e, d, f, g = 0) {
+function ya(a, b, c, e, d, f, g = 0) {
   const k = e && e.constructor === Array;
   var h = k ? e.shift() : e;
   if (!h) {
@@ -453,12 +450,12 @@ function za(a, b, c, e, d, f, g = 0) {
   if ((h = a((b ? b + "." : "") + (g + 1) + "." + c, JSON.stringify(h))) && h.then) {
     const l = this;
     return h.then(function() {
-      return za.call(l, a, b, c, k ? e : null, d, f, g + 1);
+      return ya.call(l, a, b, c, k ? e : null, d, f, g + 1);
     });
   }
-  return za.call(this, a, b, c, k ? e : null, d, f, g + 1);
+  return ya.call(this, a, b, c, k ? e : null, d, f, g + 1);
 }
-;function Aa(a, b, c, e) {
+;function za(a, b, c, e) {
   let d = [];
   for (let f = 0, g; f < a.index.length; f++) {
     if (g = a.index[f], b >= g.length) {
@@ -524,12 +521,12 @@ function S(a) {
     }
     if ("slice" === e) {
       return function(d, f) {
-        return Aa(b, d || 0, f || b.length, !1);
+        return za(b, d || 0, f || b.length, !1);
       };
     }
     if ("splice" === e) {
       return function(d, f) {
-        return Aa(b, d || 0, f || b.length, !0);
+        return za(b, d || 0, f || b.length, !0);
       };
     }
     if ("constructor" === e) {
@@ -560,7 +557,7 @@ function T(a = 8) {
   this.index = B();
   this.B = [];
   this.size = 0;
-  32 < a ? (this.h = Ba, this.A = BigInt(a)) : (this.h = Ca, this.A = a);
+  32 < a ? (this.h = Aa, this.A = BigInt(a)) : (this.h = Ba, this.A = a);
 }
 T.prototype.get = function(a) {
   const b = this.index[this.h(a)];
@@ -577,7 +574,7 @@ function U(a = 8) {
   }
   this.index = B();
   this.h = [];
-  32 < a ? (this.B = Ba, this.A = BigInt(a)) : (this.B = Ca, this.A = a);
+  32 < a ? (this.B = Aa, this.A = BigInt(a)) : (this.B = Ba, this.A = a);
 }
 U.prototype.add = function(a) {
   var b = this.B(a);
@@ -619,7 +616,7 @@ t.entries = U.prototype.entries = function*() {
     }
   }
 };
-function Ca(a) {
+function Ba(a) {
   let b = 2 ** this.A - 1;
   if ("number" == typeof a) {
     return a & b;
@@ -630,7 +627,7 @@ function Ca(a) {
   }
   return 32 === this.A ? c + 2 ** 31 : c;
 }
-function Ba(a) {
+function Aa(a) {
   let b = BigInt(2) ** this.A - BigInt(1);
   var c = typeof a;
   if ("bigint" === c) {
@@ -660,7 +657,7 @@ function Ba(a) {
         d && e.add(a, d, !1, !0);
       } else {
         if (d = h.I, !d || d(b)) {
-          h.constructor === String ? h = ["" + h] : E(h) && (h = [h]), Da(b, h, this.J, 0, e, a, h[0], c);
+          h.constructor === String ? h = ["" + h] : E(h) && (h = [h]), Ca(b, h, this.J, 0, e, a, h[0], c);
         }
       }
     }
@@ -723,7 +720,7 @@ function Ba(a) {
             k[l] = b[l];
             continue;
           }
-          Ea(b, k, l, 0, l[0], n);
+          Da(b, k, l, 0, l[0], n);
         }
       }
       this.store.set(a, k || b);
@@ -732,21 +729,21 @@ function Ba(a) {
   }
   return this;
 };
-function Ea(a, b, c, e, d, f) {
+function Da(a, b, c, e, d, f) {
   a = a[d];
   if (e === c.length - 1) {
     b[d] = f || a;
   } else if (a) {
     if (a.constructor === Array) {
       for (b = b[d] = Array(a.length), d = 0; d < a.length; d++) {
-        Ea(a, b, c, e, d);
+        Da(a, b, c, e, d);
       }
     } else {
-      b = b[d] || (b[d] = B()), d = c[++e], Ea(a, b, c, e, d);
+      b = b[d] || (b[d] = B()), d = c[++e], Da(a, b, c, e, d);
     }
   }
 }
-function Da(a, b, c, e, d, f, g, k) {
+function Ca(a, b, c, e, d, f, g, k) {
   if (a = a[g]) {
     if (e === b.length - 1) {
       if (a.constructor === Array) {
@@ -762,17 +759,17 @@ function Da(a, b, c, e, d, f, g, k) {
     } else {
       if (a.constructor === Array) {
         for (g = 0; g < a.length; g++) {
-          Da(a, b, c, e, d, f, g, k);
+          Ca(a, b, c, e, d, f, g, k);
         }
       } else {
-        g = b[++e], Da(a, b, c, e, d, f, g, k);
+        g = b[++e], Ca(a, b, c, e, d, f, g, k);
       }
     }
   } else {
     d.db && d.remove(f);
   }
 }
-;function Fa(a, b, c, e, d, f, g) {
+;function Ea(a, b, c, e, d, f, g) {
   const k = a.length;
   let h = [], l;
   var n;
@@ -788,7 +785,7 @@ function Da(a, b, c, e, d, f, g, k) {
   }
   if (a = h.length) {
     if (d) {
-      h = 1 < h.length ? Ga(h, c, e, g, f) : (h = h[0]).length > c || e ? h.slice(e, c + e) : h;
+      h = 1 < h.length ? Fa(h, c, e, g, f) : (h = h[0]).length > c || e ? h.slice(e, c + e) : h;
     } else {
       if (a < k) {
         return [];
@@ -821,7 +818,7 @@ function Da(a, b, c, e, d, f, g, k) {
   }
   return h;
 }
-function Ga(a, b, c, e, d) {
+function Fa(a, b, c, e, d) {
   const f = [], g = B();
   let k;
   var h = a.length;
@@ -866,7 +863,7 @@ function Ga(a, b, c, e, d) {
   }
   return f;
 }
-function Ha(a, b, c) {
+function Ga(a, b, c) {
   const e = B(), d = [];
   for (let f = 0, g; f < b.length; f++) {
     g = b[f];
@@ -887,7 +884,7 @@ function Ha(a, b, c) {
   }
   return d;
 }
-;function Ia(a, b, c, e) {
+;function Ha(a, b, c, e) {
   if (!a.length) {
     return a;
   }
@@ -918,7 +915,7 @@ function Ha(a, b, c) {
   d = 1 < d.length ? [].concat.apply([], d) : d[0];
   return e ? W.call(this, d) : d;
 }
-;function Ja(a, b, c) {
+;function Ia(a, b, c) {
   var e = c[0];
   if (e.then) {
     return Promise.all(c).then(function(n) {
@@ -965,10 +962,10 @@ function Ha(a, b, c) {
   return {O:e, P:d, limit:f, offset:g, enrich:k, resolve:h, suggest:l};
 }
 ;X.prototype.or = function() {
-  const {O:a, P:b, limit:c, offset:e, enrich:d, resolve:f} = Ja(this, "or", arguments);
-  return Ka.call(this, a, b, c, e, d, f);
+  const {O:a, P:b, limit:c, offset:e, enrich:d, resolve:f} = Ia(this, "or", arguments);
+  return Ja.call(this, a, b, c, e, d, f);
 };
-function Ka(a, b, c, e, d, f) {
+function Ja(a, b, c, e, d, f) {
   if (b.length) {
     const g = this;
     return Promise.all(b).then(function(k) {
@@ -976,10 +973,10 @@ function Ka(a, b, c, e, d, f) {
       for (let h = 0, l; h < k.length; h++) {
         (l = k[h]).length && (a[h] = l);
       }
-      return Ka.call(g, a, [], c, e, d, f);
+      return Ja.call(g, a, [], c, e, d, f);
     });
   }
-  a.length && (this.result.length && a.push(this.result), 2 > a.length ? this.result = a[0] : (this.result = Ga(a, c, e, !1, this.h), e = 0));
+  a.length && (this.result.length && a.push(this.result), 2 > a.length ? this.result = a[0] : (this.result = Fa(a, c, e, !1, this.h), e = 0));
   return f ? this.resolve(c, e, d) : this;
 }
 ;X.prototype.and = function() {
@@ -989,11 +986,40 @@ function Ka(a, b, c, e, d, f) {
     f && (a = !!f.suggest, d = f.resolve, b = f.limit, c = f.offset, e = f.enrich && d);
   }
   if (a) {
-    const {O:f, P:g, limit:k, offset:h, enrich:l, resolve:n, suggest:m} = Ja(this, "and", arguments);
-    return La.call(this, f, g, k, h, l, n, m);
+    const {O:f, P:g, limit:k, offset:h, enrich:l, resolve:n, suggest:m} = Ia(this, "and", arguments);
+    return Ka.call(this, f, g, k, h, l, n, m);
   }
   return d ? this.resolve(b, c, e) : this;
 };
+function Ka(a, b, c, e, d, f, g) {
+  if (b.length) {
+    const k = this;
+    return Promise.all(b).then(function(h) {
+      a = [];
+      for (let l = 0, n; l < h.length; l++) {
+        (n = h[l]).length && (a[l] = n);
+      }
+      return Ka.call(k, a, [], c, e, d, f, g);
+    });
+  }
+  if (a.length) {
+    if (this.result.length && a.unshift(this.result), 2 > a.length) {
+      this.result = a[0];
+    } else {
+      if (b = ca(a)) {
+        return this.result = Ea(a, b, c, e, g, this.h, f), f ? d ? W.call(this.index, this.result) : this.result : this;
+      }
+      this.result = [];
+    }
+  } else {
+    g || (this.result = a);
+  }
+  return f ? this.resolve(c, e, d) : this;
+}
+;X.prototype.xor = function() {
+  const {O:a, P:b, limit:c, offset:e, enrich:d, resolve:f, suggest:g} = Ia(this, "xor", arguments);
+  return La.call(this, a, b, c, e, d, f, g);
+};
 function La(a, b, c, e, d, f, g) {
   if (b.length) {
     const k = this;
@@ -1009,43 +1035,14 @@ function La(a, b, c, e, d, f, g) {
     if (this.result.length && a.unshift(this.result), 2 > a.length) {
       this.result = a[0];
     } else {
-      if (b = ca(a)) {
-        return this.result = Fa(a, b, c, e, g, this.h, f), f ? d ? W.call(this.index, this.result) : this.result : this;
-      }
-      this.result = [];
+      return this.result = Ma.call(this, a, c, e, f, this.h), f ? d ? W.call(this.index, this.result) : this.result : this;
     }
   } else {
     g || (this.result = a);
   }
   return f ? this.resolve(c, e, d) : this;
 }
-;X.prototype.xor = function() {
-  const {O:a, P:b, limit:c, offset:e, enrich:d, resolve:f, suggest:g} = Ja(this, "xor", arguments);
-  return Ma.call(this, a, b, c, e, d, f, g);
-};
-function Ma(a, b, c, e, d, f, g) {
-  if (b.length) {
-    const k = this;
-    return Promise.all(b).then(function(h) {
-      a = [];
-      for (let l = 0, n; l < h.length; l++) {
-        (n = h[l]).length && (a[l] = n);
-      }
-      return Ma.call(k, a, [], c, e, d, f, g);
-    });
-  }
-  if (a.length) {
-    if (this.result.length && a.unshift(this.result), 2 > a.length) {
-      this.result = a[0];
-    } else {
-      return this.result = Na.call(this, a, c, e, f, this.h), f ? d ? W.call(this.index, this.result) : this.result : this;
-    }
-  } else {
-    g || (this.result = a);
-  }
-  return f ? this.resolve(c, e, d) : this;
-}
-function Na(a, b, c, e, d) {
+function Ma(a, b, c, e, d) {
   const f = [], g = B();
   let k = 0;
   for (let h = 0, l; h < a.length; h++) {
@@ -1091,10 +1088,10 @@ function Na(a, b, c, e, d) {
   return f;
 }
 ;X.prototype.not = function() {
-  const {O:a, P:b, limit:c, offset:e, enrich:d, resolve:f, suggest:g} = Ja(this, "not", arguments);
-  return Oa.call(this, a, b, c, e, d, f, g);
+  const {O:a, P:b, limit:c, offset:e, enrich:d, resolve:f, suggest:g} = Ia(this, "not", arguments);
+  return Na.call(this, a, b, c, e, d, f, g);
 };
-function Oa(a, b, c, e, d, f, g) {
+function Na(a, b, c, e, d, f, g) {
   if (b.length) {
     const k = this;
     return Promise.all(b).then(function(h) {
@@ -1102,17 +1099,17 @@ function Oa(a, b, c, e, d, f, g) {
       for (let l = 0, n; l < h.length; l++) {
         (n = h[l]).length && (a[l] = n);
       }
-      return Oa.call(k, a, [], c, e, d, f, g);
+      return Na.call(k, a, [], c, e, d, f, g);
     });
   }
   if (a.length && this.result.length) {
-    this.result = Pa.call(this, a, c, e, f);
+    this.result = Oa.call(this, a, c, e, f);
   } else if (f) {
     return this.resolve(c, e, d);
   }
   return f ? d ? W.call(this.index, this.result) : this.result : this;
 }
-function Pa(a, b, c, e) {
+function Oa(a, b, c, e) {
   const d = [];
   a = new Set(a.flat().flat());
   for (let f = 0, g, k = 0; f < this.result.length; f++) {
@@ -1187,7 +1184,7 @@ X.prototype.boost = function(a) {
 X.prototype.resolve = function(a, b, c) {
   const e = this.result, d = this.index;
   this.result = this.index = null;
-  return e.length ? ("object" === typeof a && (c = a.enrich, b = a.offset, a = a.limit), Ia.call(d, e, a || 100, b, c)) : e;
+  return e.length ? ("object" === typeof a && (c = a.enrich, b = a.offset, a = a.limit), Ha.call(d, e, a || 100, b, c)) : e;
 };
 B();
 V.prototype.search = function(a, b, c, e) {
@@ -1267,7 +1264,7 @@ V.prototype.search = function(a, b, c, e) {
               }
               r.push(m = m.db.tag(v[p + 1], b, l, u));
             } else {
-              m = Qa.call(this, v[p], v[p + 1], b, l, u);
+              m = Pa.call(this, v[p], v[p + 1], b, l, u);
             }
             d.push({field:v[p], tag:v[p + 1], result:m});
           }
@@ -1319,7 +1316,7 @@ V.prototype.search = function(a, b, c, e) {
           }
         }
       } else {
-        for (let G = 0, K, ob; G < p.length; G += 2) {
+        for (let G = 0, K, nb; G < p.length; G += 2) {
           K = this.tag.get(p[G]);
           if (!K) {
             if (console.warn("Tag '" + p[G] + ":" + p[G + 1] + "' will be skipped because there is no field '" + p[G] + "'."), r) {
@@ -1328,7 +1325,7 @@ V.prototype.search = function(a, b, c, e) {
               return m ? d : new X(d);
             }
           }
-          if (ob = (K = K && K.get(p[G + 1])) && K.length) {
+          if (nb = (K = K && K.get(p[G + 1])) && K.length) {
             y++, x.push(K);
           } else if (!r) {
             return m ? d : new X(d);
@@ -1336,7 +1333,7 @@ V.prototype.search = function(a, b, c, e) {
         }
       }
       if (y) {
-        w = Ha(w, x, m);
+        w = Ga(w, x, m);
         H = w.length;
         if (!H && !r) {
           return m ? w : new X(w);
@@ -1390,12 +1387,12 @@ V.prototype.search = function(a, b, c, e) {
       for (let D = 0; D < w.length; D++) {
         d[D].result = w[D];
       }
-      return k ? Ra(d, b) : q ? Sa(d, a, z.index, z.field, z.D, q) : d;
+      return k ? Qa(d, b) : q ? Ra(d, a, z.index, z.field, z.D, q) : d;
     });
   }
-  return k ? Ra(d, b) : q ? Sa(d, a, this.index, this.field, this.D, q) : d;
+  return k ? Qa(d, b) : q ? Ra(d, a, this.index, this.field, this.D, q) : d;
 };
-function Sa(a, b, c, e, d, f) {
+function Ra(a, b, c, e, d, f) {
   let g, k, h;
   for (let n = 0, m, q, p, r, u; n < a.length; n++) {
     m = a[n].result;
@@ -1437,7 +1434,7 @@ function Sa(a, b, c, e, d, f) {
   }
   return a;
 }
-function Ra(a, b) {
+function Qa(a, b) {
   const c = [], e = B();
   for (let d = 0, f, g; d < a.length; d++) {
     f = a[d];
@@ -1456,7 +1453,7 @@ function Ra(a, b) {
   }
   return c;
 }
-function Qa(a, b, c, e, d) {
+function Pa(a, b, c, e, d) {
   let f = this.tag.get(a);
   if (!f) {
     return console.warn("Tag '" + a + "' was not found"), [];
@@ -1488,7 +1485,7 @@ function W(a) {
   this.D = [];
   this.field = [];
   this.J = [];
-  this.key = (c = b.key || b.id) && Ta(c, this.J) || "id";
+  this.key = (c = b.key || b.id) && Sa(c, this.J) || "id";
   (e = a.keystore || 0) && (this.keystore = e);
   this.fastupdate = !!a.fastupdate;
   this.reg = !this.fastupdate || a.worker || a.db ? e ? new U(e) : new Set() : e ? new T(e) : new Map();
@@ -1497,7 +1494,8 @@ function W(a) {
   this.cache = (c = a.cache || null) && new Y(c);
   a.cache = !1;
   this.worker = a.worker;
-  this.index = Ua.call(this, a, b);
+  this.priority = a.priority || 4;
+  this.index = Ta.call(this, a, b);
   this.tag = null;
   if (c = b.tag) {
     if ("string" === typeof c && (c = [c]), c.length) {
@@ -1510,7 +1508,7 @@ function W(a) {
         if (!g) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
-        f.custom ? this.F[d] = f.custom : (this.F[d] = Ta(g, this.J), f.filter && ("string" === typeof this.F[d] && (this.F[d] = new String(this.F[d])), this.F[d].I = f.filter));
+        f.custom ? this.F[d] = f.custom : (this.F[d] = Sa(g, this.J), f.filter && ("string" === typeof this.F[d] && (this.F[d] = new String(this.F[d])), this.F[d].I = f.filter));
         this.R[d] = g;
         this.tag.set(g, new Map());
       }
@@ -1582,7 +1580,7 @@ t.destroy = function() {
   }
   return Promise.all(a);
 };
-function Ua(a, b) {
+function Ta(a, b) {
   const c = new Map();
   let e = b.index || b.field || b;
   E(e) && (e = [e]);
@@ -1595,19 +1593,19 @@ function Ua(a, b) {
       c.set(f, k);
     }
     this.worker || c.set(f, new O(g, this.reg));
-    g.custom ? this.D[d] = g.custom : (this.D[d] = Ta(f, this.J), g.filter && ("string" === typeof this.D[d] && (this.D[d] = new String(this.D[d])), this.D[d].I = g.filter));
+    g.custom ? this.D[d] = g.custom : (this.D[d] = Sa(f, this.J), g.filter && ("string" === typeof this.D[d] && (this.D[d] = new String(this.D[d])), this.D[d].I = g.filter));
     this.field[d] = f;
   }
   if (this.C) {
     a = b.store;
     E(a) && (a = [a]);
     for (let d = 0, f, g; d < a.length; d++) {
-      f = a[d], g = f.field || f, f.custom ? (this.C[d] = f.custom, f.custom.V = g) : (this.C[d] = Ta(g, this.J), f.filter && ("string" === typeof this.C[d] && (this.C[d] = new String(this.C[d])), this.C[d].I = f.filter));
+      f = a[d], g = f.field || f, f.custom ? (this.C[d] = f.custom, f.custom.V = g) : (this.C[d] = Sa(g, this.J), f.filter && ("string" === typeof this.C[d] && (this.C[d] = new String(this.C[d])), this.C[d].I = f.filter));
     }
   }
   return c;
 }
-function Ta(a, b) {
+function Sa(a, b) {
   const c = a.split(":");
   let e = 0;
   for (let d = 0; d < c.length; d++) {
@@ -1673,7 +1671,7 @@ t.set = function(a, b) {
   this.store.set(a, b);
   return this;
 };
-t.searchCache = Va;
+t.searchCache = Ua;
 t.export = function(a, b, c = 0, e = 0) {
   if (c < this.field.length) {
     const g = this.field[c];
@@ -1689,27 +1687,23 @@ t.export = function(a, b, c = 0, e = 0) {
   switch(e) {
     case 0:
       d = "reg";
-      f = xa(this.reg);
+      f = wa(this.reg);
       b = null;
       break;
     case 1:
       d = "tag";
-      f = va(this.tag, this.reg.size);
+      f = this.tag && ua(this.tag, this.reg.size);
       b = null;
       break;
     case 2:
       d = "doc";
-      f = ta(this.store);
+      f = this.store && sa(this.store);
       b = null;
       break;
-    case 3:
-      d = "cfg";
-      b = f = null;
-      break;
     default:
       return;
   }
-  return za.call(this, a, b, d, f, c, e);
+  return ya.call(this, a, b, d, f, c, e);
 };
 t.import = function(a, b) {
   var c = a.split(".");
@@ -1727,7 +1721,7 @@ t.import = function(a, b) {
     switch(c) {
       case "reg":
         this.fastupdate = !1;
-        this.reg = ya(b, this.reg);
+        this.reg = xa(b, this.reg);
         for (let d = 0, f; d < this.field.length; d++) {
           f = this.index.get(this.field[d]), f.fastupdate = !1, f.reg = this.reg;
         }
@@ -1740,15 +1734,15 @@ t.import = function(a, b) {
         }
         break;
       case "tag":
-        this.tag = wa(b, this.tag);
+        this.tag = va(b, this.tag);
         break;
       case "doc":
-        this.store = ua(b, this.store);
+        this.store = ta(b, this.store);
     }
   }
 };
 la(V.prototype);
-function Va(a, b, c) {
+function Ua(a, b, c) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
   this.cache || (this.cache = new Y());
   let e = this.cache.get(a);
@@ -1789,31 +1783,31 @@ Y.prototype.clear = function() {
   this.cache.clear();
   this.h = "";
 };
-const Wa = {normalize:function(a) {
+const Va = {normalize:function(a) {
   return a.toLowerCase();
 }};
-const Xa = 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 Ya = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), Za = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
-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 Wa = 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 Xa = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), Ya = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
+const Za = {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 $a = /[\x00-\x7F]+/g;
 const ab = /[\x00-\x7F]+/g;
 const bb = /[\x00-\x7F]+/g;
-const cb = /[\x00-\x7F]+/g;
-var db = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:Wa, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:Xa}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:Xa, matcher:Ya, replacer:Za}, LatinExtra:{normalize:!0, dedupe:!0, mapper:Xa, replacer:Za.concat([/(?!^)[aeo]/g, ""]), matcher:Ya}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
+var cb = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:Va, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:Wa}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:Wa, matcher:Xa, replacer:Ya}, LatinExtra:{normalize:!0, dedupe:!0, mapper:Wa, replacer:Ya.concat([/(?!^)[aeo]/g, ""]), matcher:Xa}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
   for (let c = 0; c < a.length; c++) {
     var b = a[c];
-    let e = b.charAt(0), d = $a[e];
-    for (let f = 1, g; f < b.length && (g = b.charAt(f), "h" === g || "w" === g || !(g = $a[g]) || g === d || (e += g, d = g, 4 !== e.length)); f++) {
+    let e = b.charAt(0), d = Za[e];
+    for (let f = 1, g; f < b.length && (g = b.charAt(f), "h" === g || "w" === g || !(g = Za[g]) || g === d || (e += g, d = g, 4 !== e.length)); f++) {
     }
     a[c] = e;
   }
 }}, ArabicDefault:{rtl:!0, normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(ab, " ");
+  return ("" + a).replace($a, " ");
 }}, CjkDefault:{normalize:!1, dedupe:!0, split:"", prepare:function(a) {
-  return ("" + a).replace(bb, "");
+  return ("" + a).replace(ab, "");
 }}, CyrillicDefault:{normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(cb, " ");
+  return ("" + a).replace(bb, " ");
 }}};
-const eb = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
+const db = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
 O.prototype.add = function(a, b, c, e) {
   if (b && (a || 0 === a)) {
     if (!e && !c && this.reg.has(a)) {
@@ -1826,15 +1820,15 @@ O.prototype.add = function(a, b, c, e) {
         let r = b[this.rtl ? e - 1 - p : p];
         var d = r.length;
         if (d && (m || !n[r])) {
-          var f = this.score ? this.score(b, r, p, null, 0) : fb(q, e, p), g = "";
+          var f = this.score ? this.score(b, r, p, null, 0) : eb(q, e, p), g = "";
           switch(this.tokenize) {
             case "full":
               if (2 < d) {
                 for (f = 0; f < d; f++) {
                   for (var k = d; k > f; k--) {
                     g = r.substring(f, k);
-                    var h = this.score ? this.score(b, r, p, g, f) : fb(q, e, p, d, f);
-                    gb(this, n, g, h, a, c);
+                    var h = this.score ? this.score(b, r, p, g, f) : eb(q, e, p, d, f);
+                    fb(this, n, g, h, a, c);
                   }
                 }
                 break;
@@ -1842,24 +1836,24 @@ O.prototype.add = function(a, b, c, e) {
             case "reverse":
               if (1 < d) {
                 for (k = d - 1; 0 < k; k--) {
-                  g = r[k] + g, h = this.score ? this.score(b, r, p, g, k) : fb(q, e, p, d, k), gb(this, n, g, h, a, c);
+                  g = r[k] + g, h = this.score ? this.score(b, r, p, g, k) : eb(q, e, p, d, k), fb(this, n, g, h, a, c);
                 }
                 g = "";
               }
             case "forward":
               if (1 < d) {
                 for (k = 0; k < d; k++) {
-                  g += r[k], gb(this, n, g, f, a, c);
+                  g += r[k], fb(this, n, g, f, a, c);
                 }
                 break;
               }
             default:
-              if (gb(this, n, r, f, a, c), m && 1 < e && p < e - 1) {
+              if (fb(this, n, r, f, a, c), m && 1 < e && p < e - 1) {
                 for (d = B(), g = this.U, f = r, k = Math.min(m + 1, e - p), d[f] = 1, h = 1; h < k; h++) {
                   if ((r = b[this.rtl ? e - 1 - p - h : p + h]) && !d[r]) {
                     d[r] = 1;
-                    const u = this.score ? this.score(b, f, p, r, h) : fb(g + (e / 2 > g ? 0 : 1), e, p, k - 1, h - 1), v = this.bidirectional && r > f;
-                    gb(this, l, v ? f : r, u, a, c, v ? r : f);
+                    const u = this.score ? this.score(b, f, p, r, h) : eb(g + (e / 2 > g ? 0 : 1), e, p, k - 1, h - 1), v = this.bidirectional && r > f;
+                    fb(this, l, v ? f : r, u, a, c, v ? r : f);
                   }
                 }
               }
@@ -1871,10 +1865,10 @@ O.prototype.add = function(a, b, c, e) {
       b = "";
     }
   }
-  this.db && (b || this.commit_task.push({del:a}), this.T && hb(this));
+  this.db && (b || this.commit_task.push({del:a}), this.T && gb(this));
   return this;
 };
-function gb(a, b, c, e, d, f, g) {
+function fb(a, b, c, e, d, f, g) {
   let k = g ? a.ctx : a.map, h;
   if (!b[c] || g && !(h = b[c])[g]) {
     if (g ? (b = h || (b[c] = B()), b[g] = 1, (h = k.get(g)) ? k = h : k.set(g, k = new Map())) : b[c] = 1, (h = k.get(c)) ? k = h : k.set(c, k = h = []), k = k[e] || (k[e] = []), !f || !k.includes(d)) {
@@ -1892,7 +1886,7 @@ function gb(a, b, c, e, d, f, g) {
     }
   }
 }
-function fb(a, b, c, e, d) {
+function eb(a, b, c, e, d) {
   return c && 1 < a ? b + (e || 0) <= a ? c + (d || 0) : (a - 1) / (b + (e || 0)) * (c + (d || 0)) + 1 | 0 : 0;
 }
 ;O.prototype.search = function(a, b, c) {
@@ -1903,11 +1897,11 @@ function fb(a, b, c, e, d) {
   d = p.length;
   b = b || (h ? 100 : 0);
   if (1 === d) {
-    return ib.call(this, p[0], "", b, k, h, q, l);
+    return hb.call(this, p[0], "", b, k, h, q, l);
   }
   f = this.depth && !1 !== f;
   if (2 === d && f && !g) {
-    return ib.call(this, p[0], p[1], b, k, h, q, l);
+    return hb.call(this, p[0], p[1], b, k, h, q, l);
   }
   let r = B(), u = 0, v;
   1 < d && f && (v = p[0], u = 1);
@@ -1921,8 +1915,8 @@ function fb(a, b, c, e, d) {
       for (let y, F; u < d; u++) {
         if ((F = p[u]) && !r[F]) {
           r[F] = 1;
-          y = await jb(x, F, v, 0, 0, !1, !1);
-          if (y = kb(y, e, g, m)) {
+          y = await ib(x, F, v, 0, 0, !1, !1);
+          if (y = jb(y, e, g, m)) {
             e = y;
             break;
           }
@@ -1930,14 +1924,14 @@ function fb(a, b, c, e, d) {
         }
         g && v && u === d - 1 && !e.length && (v = "", u = -1, r = B());
       }
-      return lb(e, m, b, k, g, n, h);
+      return kb(e, m, b, k, g, n, h);
     }();
   }
   for (let x, y; u < d; u++) {
     if ((y = p[u]) && !r[y]) {
       r[y] = 1;
-      x = jb(this, y, v, 0, 0, !1, !1);
-      if (x = kb(x, e, g, m)) {
+      x = ib(this, y, v, 0, 0, !1, !1);
+      if (x = jb(x, e, g, m)) {
         e = x;
         break;
       }
@@ -1945,24 +1939,24 @@ function fb(a, b, c, e, d) {
     }
     g && v && u === d - 1 && !e.length && (v = "", u = -1, r = B());
   }
-  return lb(e, m, b, k, g, n, h);
+  return kb(e, m, b, k, g, n, h);
 };
-function lb(a, b, c, e, d, f, g) {
+function kb(a, b, c, e, d, f, g) {
   let k = a.length, h = a;
   if (1 < k) {
-    h = Fa(a, b, c, e, d, f, g);
+    h = Ea(a, b, c, e, d, f, g);
   } else if (1 === k) {
-    return g ? Ia.call(null, a[0], c, e) : new X(a[0]);
+    return g ? Ha.call(null, a[0], c, e) : new X(a[0]);
   }
   return g ? h : new X(h);
 }
-function ib(a, b, c, e, d, f, g) {
-  a = jb(this, a, b, c, e, d, f, g);
+function hb(a, b, c, e, d, f, g) {
+  a = ib(this, a, b, c, e, d, f, g);
   return this.db ? a.then(function(k) {
     return d ? k || [] : new X(k);
-  }) : a && a.length ? d ? Ia.call(this, a, c, e) : new X(a) : d ? [] : new X();
+  }) : a && a.length ? d ? Ha.call(this, a, c, e) : new X(a) : d ? [] : new X();
 }
-function kb(a, b, c, e) {
+function jb(a, b, c, e) {
   let d = [];
   if (a && a.length) {
     if (a.length <= e) {
@@ -1983,7 +1977,7 @@ function kb(a, b, c, e) {
     return d;
   }
 }
-function jb(a, b, c, e, d, f, g, k) {
+function ib(a, b, c, e, d, f, g, k) {
   let h;
   c && (h = a.bidirectional && b > c) && (h = c, c = b, b = h);
   if (a.db) {
@@ -2007,15 +2001,15 @@ function jb(a, b, c, e, d, f, g, k) {
         }
       }
     } else {
-      mb(this.map, a), this.depth && mb(this.ctx, a);
+      lb(this.map, a), this.depth && lb(this.ctx, a);
     }
     b || this.reg.delete(a);
   }
-  this.db && (this.commit_task.push({del:a}), this.T && hb(this));
+  this.db && (this.commit_task.push({del:a}), this.T && gb(this));
   this.cache && this.cache.remove(a);
   return this;
 };
-function mb(a, b) {
+function lb(a, b) {
   let c = 0;
   if (a.constructor === Array) {
     for (let e = 0, d, f; e < a.length; e++) {
@@ -2030,7 +2024,7 @@ function mb(a, b) {
     }
   } else {
     for (let e of a.entries()) {
-      const d = e[0], f = mb(e[1], b);
+      const d = e[0], f = lb(e[1], b);
       f ? c += f : a.delete(d);
     }
   }
@@ -2042,12 +2036,12 @@ function mb(a, b) {
   }
   if (a) {
     var c = E(a) ? a : a.preset;
-    c && (eb[c] || console.warn("Preset not found: " + c), a = Object.assign({}, eb[c], a));
+    c && (db[c] || console.warn("Preset not found: " + c), a = Object.assign({}, db[c], a));
   } else {
     a = {};
   }
   c = a.context;
-  const e = !0 === c ? {depth:1} : c || {}, d = E(a.encoder) ? db[a.encoder] : a.encode || a.encoder || Wa;
+  const e = !0 === c ? {depth:1} : c || {}, d = E(a.encoder) ? cb[a.encoder] : a.encode || a.encoder || Va;
   this.encoder = d.encode ? d : "object" === typeof d ? new J(d) : {encode:d};
   this.resolution = a.resolution || 9;
   this.tokenize = (c = a.tokenize) && "default" !== c && c || "strict";
@@ -2084,11 +2078,11 @@ t.destroy = function() {
   this.commit_timer && (clearTimeout(this.commit_timer), this.commit_timer = null);
   return this.db.destroy();
 };
-function hb(a) {
+function gb(a) {
   a.commit_timer || (a.commit_timer = setTimeout(function() {
     a.commit_timer = null;
     a.db.commit(a, void 0, void 0);
-  }, 0));
+  }, 1));
 }
 t.clear = function() {
   this.map.clear();
@@ -2108,7 +2102,7 @@ t.update = function(a, b) {
   const c = this, e = this.remove(a);
   return e && e.then ? e.then(() => c.add(a, b)) : this.add(a, b);
 };
-function nb(a) {
+function mb(a) {
   let b = 0;
   if (a.constructor === Array) {
     for (let c = 0, e; c < a.length; c++) {
@@ -2116,7 +2110,7 @@ function nb(a) {
     }
   } else {
     for (const c of a) {
-      const e = c[0], d = nb(c[1]);
+      const e = c[0], d = mb(c[1]);
       d ? b += d : a.delete(e);
     }
   }
@@ -2126,17 +2120,17 @@ t.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
-  nb(this.map);
-  this.depth && nb(this.ctx);
+  mb(this.map);
+  this.depth && mb(this.ctx);
   return this;
 };
-t.searchCache = Va;
+t.searchCache = Ua;
 t.export = function(a, b, c = 0, e = 0) {
   let d, f;
   switch(e) {
     case 0:
       d = "reg";
-      f = xa(this.reg);
+      f = wa(this.reg);
       break;
     case 1:
       d = "cfg";
@@ -2144,29 +2138,29 @@ t.export = function(a, b, c = 0, e = 0) {
       break;
     case 2:
       d = "map";
-      f = ta(this.map, this.reg.size);
+      f = sa(this.map, this.reg.size);
       break;
     case 3:
       d = "ctx";
-      f = va(this.ctx, this.reg.size);
+      f = ua(this.ctx, this.reg.size);
       break;
     default:
       return;
   }
-  return za.call(this, a, b, d, f, c, e);
+  return ya.call(this, a, b, d, f, c, e);
 };
 t.import = function(a, b) {
   if (b) {
     switch("string" === typeof b && (b = JSON.parse(b)), a = a.split("."), "json" === a[a.length - 1] && a.pop(), 3 === a.length && a.shift(), a = 1 < a.length ? a[1] : a[0], a) {
       case "reg":
         this.fastupdate = !1;
-        this.reg = ya(b, this.reg);
+        this.reg = xa(b, this.reg);
         break;
       case "map":
-        this.map = ua(b, this.map);
+        this.map = ta(b, this.map);
         break;
       case "ctx":
-        this.ctx = wa(b, this.ctx);
+        this.ctx = va(b, this.ctx);
     }
   }
 };
@@ -2221,10 +2215,10 @@ t.serialize = function(a = !0) {
   return a ? "function inject(index){" + b + e + d + "}" : b + e + d;
 };
 la(O.prototype);
-const pb = "undefined" !== typeof window && (window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB), qb = ["map", "ctx", "tag", "reg", "cfg"];
-function rb(a, b = {}) {
+const ob = "undefined" !== typeof window && (window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB), pb = ["map", "ctx", "tag", "reg", "cfg"];
+function qb(a, b = {}) {
   if (!this) {
-    return new rb(a, b);
+    return new qb(a, b);
   }
   "object" === typeof a && (b = a, a = a.name);
   a || console.info("Default storage space was used, because a name was not passed.");
@@ -2235,7 +2229,7 @@ function rb(a, b = {}) {
   this.db = null;
   this.h = {};
 }
-t = rb.prototype;
+t = qb.prototype;
 t.mount = function(a) {
   if (!a.encoder) {
     return a.mount(this);
@@ -2247,10 +2241,10 @@ t.open = function() {
   let a = this;
   navigator.storage && navigator.storage.persist();
   return this.db || new Promise(function(b, c) {
-    const e = pb.open(a.id + (a.field ? ":" + a.field : ""), 1);
+    const e = ob.open(a.id + (a.field ? ":" + a.field : ""), 1);
     e.onupgradeneeded = function() {
       const d = a.db = this.result;
-      qb.forEach(f => {
+      pb.forEach(f => {
         d.objectStoreNames.contains(f) || d.createObjectStore(f);
       });
     };
@@ -2276,13 +2270,13 @@ t.close = function() {
   this.db = null;
 };
 t.destroy = function() {
-  const a = pb.deleteDatabase(this.id + (this.field ? ":" + this.field : ""));
+  const a = ob.deleteDatabase(this.id + (this.field ? ":" + this.field : ""));
   return Z(a);
 };
 t.clear = function() {
-  const a = this.db.transaction(qb, "readwrite");
-  for (let b = 0; b < qb.length; b++) {
-    a.objectStore(qb[b]).clear();
+  const a = this.db.transaction(pb, "readwrite");
+  for (let b = 0; b < pb.length; b++) {
+    a.objectStore(pb[b]).clear();
   }
   return Z(a);
 };
@@ -2467,7 +2461,7 @@ t.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 sb(a, b, c) {
+function rb(a, b, c) {
   const e = a.value;
   let d, f, g = 0;
   for (let k = 0, h; k < e.length; k++) {
@@ -2496,17 +2490,17 @@ t.remove = function(a) {
   return Promise.all([this.transaction("map", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       const c = this.result;
-      c && sb(c, a);
+      c && rb(c, a);
     };
   }), this.transaction("ctx", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       const c = this.result;
-      c && sb(c, a);
+      c && rb(c, a);
     };
   }), this.transaction("tag", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       const c = this.result;
-      c && sb(c, a, !0);
+      c && rb(c, a, !0);
     };
   }), this.transaction("reg", "readwrite", function(b) {
     for (let c = 0; c < a.length; c++) {
@@ -2526,6 +2520,6 @@ function Z(a) {
     a = null;
   });
 }
-;export default {Index:O, Charset:db, Encoder:J, Document:V, Worker:Q, Resolver:X, IndexedDB:rb, Language:{}};
+;export default {Index:O, Charset:cb, Encoder:J, Document:V, Worker:Q, Resolver:X, IndexedDB:qb, Language:{}};
 
-export const Index=O;export const  Charset=db;export const  Encoder=J;export const  Document=V;export const  Worker=Q;export const  Resolver=X;export const  IndexedDB=rb;export const  Language={};
\ No newline at end of file
+export const Index=O;export const  Charset=cb;export const  Encoder=J;export const  Document=V;export const  Worker=Q;export const  Resolver=X;export const  IndexedDB=qb;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 a9f9e06..201c2d6 100644
--- a/dist/flexsearch.bundle.module.min.js
+++ b/dist/flexsearch.bundle.module.min.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.115 (Bundle/Module)
+ * FlexSearch.js v0.8.117 (Bundle/Module)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -21,73 +21,73 @@ t.addMatcher=function(a,b){if("object"===typeof a)return this.addReplacer(a,b);i
 t.encode=function(a){if(this.cache&&a.length<=this.K)if(this.H){if(this.B.has(a))return this.B.get(a)}else this.H=setTimeout(L,50,this);this.normalize&&("function"===typeof this.normalize?a=this.normalize(a):a=ja?a.normalize("NFKD").replace(ja,"").toLowerCase():a.toLowerCase());this.prepare&&(a=this.prepare(a));this.numeric&&3<a.length&&(a=a.replace(ha,"$1 $2").replace(ia,"$1 $2").replace(fa,"$1 "));const b=!(this.dedupe||this.mapper||this.filter||this.matcher||this.stemmer||this.replacer);let c=
 [],e=this.split||""===this.split?a.split(this.split):a;for(let f=0,g,k;f<e.length;f++)if((g=k=e[f])&&!(g.length<this.minlength))if(b)c.push(g);else if(!this.filter||!this.filter.has(g)){if(this.cache&&g.length<=this.L)if(this.H){var d=this.G.get(g);if(d||""===d){d&&c.push(d);continue}}else this.H=setTimeout(L,50,this);this.stemmer&&2<g.length&&(this.N||(this.N=new RegExp("(?!^)("+this.A+")$")),g=g.replace(this.N,h=>this.stemmer.get(h)),g.length<this.minlength||this.filter&&this.filter.has(g))&&(g=
 "");if(g&&(this.mapper||this.dedupe&&1<g.length)){d="";for(let h=0,l="",n,m;h<g.length;h++)n=g.charAt(h),n===l&&this.dedupe||((m=this.mapper&&this.mapper.get(n))||""===m?m===l&&this.dedupe||!(l=m)||(d+=m):d+=l=n);g=d}this.matcher&&1<g.length&&(this.M||(this.M=new RegExp("("+this.h+")","g")),g=g.replace(this.M,h=>this.matcher.get(h)));if(g&&this.replacer)for(d=0;g&&d<this.replacer.length;d+=2)g=g.replace(this.replacer[d],this.replacer[d+1]);this.cache&&k.length<=this.L&&(this.G.set(k,g),this.G.size>
-this.S&&(this.G.clear(),this.L=this.L/1.1|0));g&&c.push(g)}this.finalize&&(c=this.finalize(c)||c);this.cache&&a.length<=this.K&&(this.B.set(a,c),this.B.size>this.S&&(this.B.clear(),this.K=this.K/1.1|0));return c};function L(a){a.H=null;a.B.clear();a.G.clear()};let M,N;async function ka(a){a=a.data;var b=a.task;const c=a.id;let e=a.args;switch(b){case "init":N=a.options||{};(b=a.factory)?(Function("return "+b)()(self),M=new self.FlexSearch.Index(N),delete self.FlexSearch):M=new O(N);postMessage({id:c});break;default:let d;"export"===b&&(e[1]?(e[0]=N.export,e[2]=0,e[3]=1):e=null);"import"===b?e[0]&&(a=await N.import.call(M,e[0]),M.import(e[0],a)):(d=e&&M[b].apply(M,e))&&d.then&&(d=await d);postMessage("search"===b?{id:c,msg:d}:{id:c})}};function la(a){P.call(a,"add");P.call(a,"append");P.call(a,"search");P.call(a,"update");P.call(a,"remove")}let ma,na;const oa={},pa={};function qa(a){ma=0;oa[a]=pa[a]}
-function P(a){this[a+"Async"]=function(){const b=arguments;var c=b[b.length-1];let e;"function"===typeof c&&(e=c,delete b[b.length-1]);ma||(ma=setTimeout(qa,0,a),na=Date.now());pa[a]||(pa[a]=oa[a]=1E3);if(!--oa[a]){oa[a]=pa[a]=pa[a]*this.priority*this.priority*3/(Date.now()-na)|0||1;ma=clearTimeout(ma);const f=this;return new Promise(g=>{setTimeout(function(){g(f[a+"Async"].apply(f,b))},0)})}const d=this[a].apply(this,b);c=d.then?d:new Promise(f=>f(d));e&&c.then(e);return c}};let ra=0;
-function Q(a={}){function b(g){function k(h){h=h.data||h;const l=h.id,n=l&&d.h[l];n&&(n(h.msg),delete d.h[l])}this.worker=g;this.h=B();if(this.worker){e?this.worker.on("message",k):this.worker.onmessage=k;if(a.config)return new Promise(function(h){d.h[++ra]=function(){h(d)};d.worker.postMessage({id:ra,task:"init",factory:c,options:a})});this.worker.postMessage({task:"init",factory:c,options:a});return this}}if(!this||this.constructor!==Q)return new Q(a);let c="undefined"!==typeof self?self._factory:"undefined"!==
-typeof window?window._factory:null;c&&(c=c.toString());const e="undefined"===typeof window,d=this,f=sa(c,e,a.worker);return f.then?f.then(function(g){return b.call(d,g)}):b.call(this,f)}R("add");R("append");R("search");R("update");R("remove");R("clear");R("export");R("import");la(Q.prototype);
-function R(a){Q.prototype[a]=function(){const b=this,c=[].slice.call(arguments);var e=c[c.length-1];let d;"function"===typeof e&&(d=e,c.pop());e=new Promise(function(f){"export"===a&&"function"===typeof c[0]&&(c[0]=null);b.h[++ra]=f;b.worker.postMessage({task:a,id:ra,args:c})});return d?(e.then(d),this):e}}
-function sa(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"](import.meta.dirname + "/node/node.mjs"); }):a?new window.Worker(URL.createObjectURL(new Blob(["onmessage="+ka.toString()],{type:"text/javascript"}))):new window.Worker("string"===typeof c?c:import.meta.url.replace("/worker.js","/worker/worker.js").replace("flexsearch.bundle.module.min.js",
-"module/worker/worker.js"),{type:"module"})};function ta(a,b=0){let c=[],e=[];b&&(b=25E4/b*5E3|0);for(const d of a.entries())e.push(d),e.length===b&&(c.push(e),e=[]);e.length&&c.push(e);return c}function ua(a,b){b||(b=new Map);for(let c=0,e;c<a.length;c++)e=a[c],b.set(e[0],e[1]);return b}function va(a,b=0){let c=[],e=[];b&&(b=25E4/b*1E3|0);for(const d of a.entries())e.push([d[0],ta(d[1])[0]]),e.length===b&&(c.push(e),e=[]);e.length&&c.push(e);return c}
-function wa(a,b){b||(b=new Map);for(let c=0,e,d;c<a.length;c++)e=a[c],d=b.get(e[0]),b.set(e[0],ua(e[1],d));return b}function xa(a){let b=[],c=[];for(const e of a.keys())c.push(e),25E4===c.length&&(b.push(c),c=[]);c.length&&b.push(c);return b}function ya(a,b){b||(b=new Set);for(let c=0;c<a.length;c++)b.add(a[c]);return b}
-function za(a,b,c,e,d,f,g=0){const k=e&&e.constructor===Array;var h=k?e.shift():e;if(!h)return this.export(a,b,d,f+1);if((h=a((b?b+".":"")+(g+1)+"."+c,JSON.stringify(h)))&&h.then){const l=this;return h.then(function(){return za.call(l,a,b,c,k?e:null,d,f,g+1)})}return za.call(this,a,b,c,k?e:null,d,f,g+1)};function Aa(a,b,c,e){let d=[];for(let f=0,g;f<a.index.length;f++)if(g=a.index[f],b>=g.length)b-=g.length;else{b=g[e?"splice":"slice"](b,c);const k=b.length;if(k&&(d=d.length?d.concat(b):b,c-=k,e&&(a.length-=k),!c))break;b=0}return d}
+this.S&&(this.G.clear(),this.L=this.L/1.1|0));g&&c.push(g)}this.finalize&&(c=this.finalize(c)||c);this.cache&&a.length<=this.K&&(this.B.set(a,c),this.B.size>this.S&&(this.B.clear(),this.K=this.K/1.1|0));return c};function L(a){a.H=null;a.B.clear();a.G.clear()};let M,N;async function ka(a){a=a.data;var b=a.task;const c=a.id;let e=a.args;switch(b){case "init":N=a.options||{};(b=a.factory)?(Function("return "+b)()(self),M=new self.FlexSearch.Index(N),delete self.FlexSearch):M=new O(N);postMessage({id:c});break;default:let d;"export"===b&&(e[1]?(e[0]=N.export,e[2]=0,e[3]=1):e=null);"import"===b?e[0]&&(a=await N.import.call(M,e[0]),M.import(e[0],a)):(d=e&&M[b].apply(M,e))&&d.then&&(d=await d);postMessage("search"===b?{id:c,msg:d}:{id:c})}};function la(a){ma.call(a,"add");ma.call(a,"append");ma.call(a,"search");ma.call(a,"update");ma.call(a,"remove")}let na,oa,pa;function qa(){na=pa=0}
+function ma(a){this[a+"Async"]=function(){const b=arguments;var c=b[b.length-1];let e;"function"===typeof c&&(e=c,delete b[b.length-1]);na?pa||(pa=Date.now()-oa>=this.priority*this.priority*3):(na=setTimeout(qa,0),oa=Date.now());if(pa){const f=this;return new Promise(g=>{setTimeout(function(){g(f[a+"Async"].apply(f,b))},0)})}const d=this[a].apply(this,b);c=d.then?d:new Promise(f=>f(d));e&&c.then(e);return c}};let P=0;
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-t.close=function(){this.db.close();this.db=null};t.destroy=function(){const a=pb.deleteDatabase(this.id+(this.field?":"+this.field:""));return Z(a)};t.clear=function(){const a=this.db.transaction(qb,"readwrite");for(let b=0;b<qb.length;b++)a.objectStore(qb[b]).clear();return Z(a)};
+n[0];g=n[1];for(const m of g.entries()){g=m[0];k=m[1];h="";for(let q=0,p;q<k.length;q++){p=k[q]||[""];l="";for(let r=0;r<p.length;r++)l+=(l?",":"")+("string"===c?'"'+p[r]+'"':p[r]);l="["+l+"]";h+=(h?",":"")+l}h='new Map([["'+g+'",['+h+"]]])";h='["'+f+'",'+h+"]";d+=(d?",":"")+h}}d="index.ctx=new Map(["+d+"]);";return a?"function inject(index){"+b+e+d+"}":b+e+d};la(O.prototype);const ob="undefined"!==typeof window&&(window.indexedDB||window.mozIndexedDB||window.webkitIndexedDB||window.msIndexedDB),pb=["map","ctx","tag","reg","cfg"];
+function qb(a,b={}){if(!this)return new qb(a,b);"object"===typeof a&&(b=a,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.type=b.type;this.fastupdate=this.support_tag_search=!1;this.db=null;this.h={}}t=qb.prototype;t.mount=function(a){if(!a.encoder)return a.mount(this);a.db=this;return this.open()};
+t.open=function(){let a=this;navigator.storage&&navigator.storage.persist();return this.db||new Promise(function(b,c){const e=ob.open(a.id+(a.field?":"+a.field:""),1);e.onupgradeneeded=function(){const d=a.db=this.result;pb.forEach(f=>{d.objectStoreNames.contains(f)||d.createObjectStore(f)})};e.onblocked=function(d){console.error("blocked",d);c()};e.onerror=function(d){console.error(this.error,d);c()};e.onsuccess=function(){a.db=this.result;a.db.onversionchange=function(){a.close()};b(a)}})};
+t.close=function(){this.db.close();this.db=null};t.destroy=function(){const a=ob.deleteDatabase(this.id+(this.field?":"+this.field:""));return Z(a)};t.clear=function(){const a=this.db.transaction(pb,"readwrite");for(let b=0;b<pb.length;b++)a.objectStore(pb[b]).clear();return Z(a)};
 t.get=function(a,b,c=0,e=0,d=!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(k){let h=[];if(!k||!k.length)return h;if(d){if(!c&&!e&&1===k.length)return k[0];for(let l=0,n;l<k.length;l++)if((n=k[l])&&n.length){if(e>=n.length){e-=n.length;continue}const m=c?e+Math.min(n.length-e,c):n.length;for(let q=e;q<m;q++)h.push(n[q]);e=0;if(h.length===c)break}return f?g.enrich(h):h}return k})};
 t.tag=function(a,b=0,c=0,e=!1){a=this.db.transaction("tag","readonly").objectStore("tag").get(a);const d=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 e?d.enrich(f):f})};
 t.enrich=function(a){"object"!==typeof a&&(a=[a]);const b=this.db.transaction("reg","readonly").objectStore("reg"),c=[];for(let e=0;e<a.length;e++)c[e]=Z(b.get(a[e]));return Promise.all(c).then(function(e){for(let d=0;d<e.length;d++)e[d]={id:a[d],doc:e[d]?JSON.parse(e[d]):null};return e})};t.has=function(a){a=this.db.transaction("reg","readonly").objectStore("reg").getKey(a);return Z(a)};t.search=null;t.info=function(){};
@@ -96,7 +96,7 @@ t.commit=async function(a,b,c){if(b)await this.clear(),a.commit_task=[];else{let
 for(let n=0,m,q;n<l;n++)if((q=g[n])&&q.length){if((m=k[n])&&m.length)for(h=0;h<q.length;h++)m.push(q[h]);else k[n]=q;h=1}}else k=g,h=1;h&&e.put(k,f)})}}),await this.transaction("ctx","readwrite",function(e){for(const d of a.ctx){const f=d[0],g=d[1];for(const k of g){const h=k[0],l=k[1];l.length&&(b?e.put(l,f+":"+h):e.get(f+":"+h).onsuccess=function(){let n=this.result;var m;if(n&&n.length){const q=Math.max(n.length,l.length);for(let p=0,r,u;p<q;p++)if((u=l[p])&&u.length){if((r=n[p])&&r.length)for(m=
 0;m<u.length;m++)r.push(u[m]);else n[p]=u;m=1}}else n=l,m=1;m&&e.put(n,f+":"+h)})}}}),a.store?await this.transaction("reg","readwrite",function(e){for(const d of a.store){const f=d[0],g=d[1];e.put("object"===typeof g?JSON.stringify(g):1,f)}}):a.bypass||await this.transaction("reg","readwrite",function(e){for(const d of a.reg.keys())e.put(1,d)}),a.tag&&await this.transaction("tag","readwrite",function(e){for(const d of a.tag){const f=d[0],g=d[1];g.length&&(e.get(f).onsuccess=function(){let k=this.result;
 k=k&&k.length?k.concat(g):g;e.put(k,f)})}}),a.map.clear(),a.ctx.clear(),a.tag&&a.tag.clear(),a.store&&a.store.clear(),a.document||a.reg.clear())};
-function sb(a,b,c){const e=a.value;let d,f,g=0;for(let k=0,h;k<e.length;k++){if(h=c?e:e[k]){for(let l=0,n,m;l<b.length;l++)if(m=b[l],n=h.indexOf(f?parseInt(m,10):m),0>n&&!f&&"string"===typeof m&&!isNaN(m)&&(n=h.indexOf(parseInt(m,10)))&&(f=1),0<=n)if(d=1,1<h.length)h.splice(n,1);else{e[k]=[];break}g+=h.length}if(c)break}g?d&&a.update(e):a.delete();a.continue()}
-t.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&&sb(c,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&sb(c,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&sb(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:db,Encoder:J,Document:V,Worker:Q,Resolver:X,IndexedDB:rb,Language:{}};
-export const Index=O;export const Charset=db;export const Encoder=J;export const Document=V;export const Worker=Q;export const Resolver=X;export const IndexedDB=rb;export const Language={};
\ No newline at end of file
+function rb(a,b,c){const e=a.value;let d,f,g=0;for(let k=0,h;k<e.length;k++){if(h=c?e:e[k]){for(let l=0,n,m;l<b.length;l++)if(m=b[l],n=h.indexOf(f?parseInt(m,10):m),0>n&&!f&&"string"===typeof m&&!isNaN(m)&&(n=h.indexOf(parseInt(m,10)))&&(f=1),0<=n)if(d=1,1<h.length)h.splice(n,1);else{e[k]=[];break}g+=h.length}if(c)break}g?d&&a.update(e):a.delete();a.continue()}
+t.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&&rb(c,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&rb(c,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&rb(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:cb,Encoder:J,Document:V,Worker:Q,Resolver:X,IndexedDB:qb,Language:{}};
+export const Index=O;export const Charset=cb;export const Encoder=J;export const Document=V;export const Worker=Q;export const Resolver=X;export const IndexedDB=qb;export const Language={};
\ No newline at end of file
diff --git a/dist/flexsearch.compact.debug.js b/dist/flexsearch.compact.debug.js
index 8f1703e..7625b2d 100644
--- a/dist/flexsearch.compact.debug.js
+++ b/dist/flexsearch.compact.debug.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.115 (Bundle/Debug)
+ * FlexSearch.js v0.8.117 (Bundle/Debug)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -300,11 +300,9 @@ async function ia(a) {
   P.call(a, "update");
   P.call(a, "remove");
 }
-let Q, ka;
-const R = {}, S = {};
-function la(a) {
-  Q = 0;
-  R[a] = S[a];
+let ka, la, Q;
+function ma() {
+  ka = Q = 0;
 }
 function P(a) {
   this[a + "Async"] = function() {
@@ -312,11 +310,8 @@ function P(a) {
     var b = c[c.length - 1];
     let e;
     "function" === typeof b && (e = b, delete c[c.length - 1]);
-    Q || (Q = setTimeout(la, 0, a), ka = Date.now());
-    S[a] || (S[a] = R[a] = 1000);
-    if (!--R[a]) {
-      R[a] = S[a] = S[a] * this.priority * this.priority * 3 / (Date.now() - ka) | 0 || 1;
-      Q = clearTimeout(Q);
+    ka ? Q || (Q = Date.now() - la >= this.priority * this.priority * 3) : (ka = setTimeout(ma, 0), la = Date.now());
+    if (Q) {
       const f = this;
       return new Promise(g => {
         setTimeout(function() {
@@ -330,8 +325,8 @@ function P(a) {
     return b;
   };
 }
-;let T = 0;
-function ma(a = {}) {
+;let R = 0;
+function S(a = {}) {
   function c(g) {
     function k(h) {
       h = h.data || h;
@@ -344,18 +339,20 @@ function ma(a = {}) {
       e ? this.worker.on("message", k) : this.worker.onmessage = k;
       if (a.config) {
         return new Promise(function(h) {
-          d.h[++T] = function() {
+          d.h[++R] = function() {
             h(d);
+            1e9 < R && (R = 0);
           };
-          d.worker.postMessage({id:T, task:"init", factory:b, options:a});
+          d.worker.postMessage({id:R, task:"init", factory:b, options:a});
         });
       }
       this.worker.postMessage({task:"init", factory:b, options:a});
+      this.priority = a.priority || 4;
       return this;
     }
   }
-  if (!this || this.constructor !== ma) {
-    return new ma(a);
+  if (!this || this.constructor !== S) {
+    return new S(a);
   }
   let b = "undefined" !== typeof self ? self._factory : "undefined" !== typeof window ? window._factory : null;
   b && (b = b.toString());
@@ -364,25 +361,25 @@ function ma(a = {}) {
     return c.call(d, g);
   }) : c.call(this, f);
 }
-U("add");
-U("append");
-U("search");
-U("update");
-U("remove");
-U("clear");
-U("export");
-U("import");
-ja(ma.prototype);
-function U(a) {
-  ma.prototype[a] = function() {
+T("add");
+T("append");
+T("search");
+T("update");
+T("remove");
+T("clear");
+T("export");
+T("import");
+ja(S.prototype);
+function T(a) {
+  S.prototype[a] = function() {
     const c = this, b = [].slice.call(arguments);
     var e = b[b.length - 1];
     let d;
     "function" === typeof e && (d = e, b.pop());
     e = new Promise(function(f) {
       "export" === a && "function" === typeof b[0] && (b[0] = null);
-      c.h[++T] = f;
-      c.worker.postMessage({task:a, id:T, args:b});
+      c.h[++R] = f;
+      c.worker.postMessage({task:a, id:R, args:b});
     });
     return d ? (e.then(d), this) : e;
   };
@@ -438,7 +435,7 @@ function ta(a, c) {
   }
   return c;
 }
-function ua(a, c, b, e, d, f, g = 0) {
+function U(a, c, b, e, d, f, g = 0) {
   const k = e && e.constructor === Array;
   var h = k ? e.shift() : e;
   if (!h) {
@@ -447,10 +444,10 @@ function ua(a, c, b, e, d, f, g = 0) {
   if ((h = a((c ? c + "." : "") + (g + 1) + "." + b, JSON.stringify(h))) && h.then) {
     const l = this;
     return h.then(function() {
-      return ua.call(l, a, c, b, k ? e : null, d, f, g + 1);
+      return U.call(l, a, c, b, k ? e : null, d, f, g + 1);
     });
   }
-  return ua.call(this, a, c, b, k ? e : null, d, f, g + 1);
+  return U.call(this, a, c, b, k ? e : null, d, f, g + 1);
 }
 ;V.prototype.add = function(a, c, b) {
   I(a) && (c = a, a = J(c, this.key));
@@ -466,7 +463,7 @@ function ua(a, c, b, e, d, f, g = 0) {
         d && e.add(a, d, !1, !0);
       } else {
         if (d = h.I, !d || d(c)) {
-          h.constructor === String ? h = ["" + h] : D(h) && (h = [h]), va(c, h, this.J, 0, e, a, h[0], b);
+          h.constructor === String ? h = ["" + h] : D(h) && (h = [h]), ua(c, h, this.J, 0, e, a, h[0], b);
         }
       }
     }
@@ -517,7 +514,7 @@ function ua(a, c, b, e, d, f, g = 0) {
             k[l] = c[l];
             continue;
           }
-          wa(c, k, l, 0, l[0], m);
+          va(c, k, l, 0, l[0], m);
         }
       }
       this.store.set(a, k || c);
@@ -525,21 +522,21 @@ function ua(a, c, b, e, d, f, g = 0) {
   }
   return this;
 };
-function wa(a, c, b, e, d, f) {
+function va(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++) {
-        wa(a, c, b, e, d);
+        va(a, c, b, e, d);
       }
     } else {
-      c = c[d] || (c[d] = C()), d = b[++e], wa(a, c, b, e, d);
+      c = c[d] || (c[d] = C()), d = b[++e], va(a, c, b, e, d);
     }
   }
 }
-function va(a, c, b, e, d, f, g, k) {
+function ua(a, c, b, e, d, f, g, k) {
   if (a = a[g]) {
     if (e === c.length - 1) {
       if (a.constructor === Array) {
@@ -555,15 +552,15 @@ function va(a, c, b, e, d, f, g, k) {
     } else {
       if (a.constructor === Array) {
         for (g = 0; g < a.length; g++) {
-          va(a, c, b, e, d, f, g, k);
+          ua(a, c, b, e, d, f, g, k);
         }
       } else {
-        g = c[++e], va(a, c, b, e, d, f, g, k);
+        g = c[++e], ua(a, c, b, e, d, f, g, k);
       }
     }
   }
 }
-;function xa(a, c, b, e, d) {
+;function wa(a, c, b, e, d) {
   const f = a.length;
   let g = [], k, h;
   k = C();
@@ -578,7 +575,7 @@ function va(a, c, b, e, d, f, g, k) {
   }
   if (a = g.length) {
     if (d) {
-      g = 1 < g.length ? ya(g, b, e) : (g = g[0]).length > b || e ? g.slice(e, b + e) : g;
+      g = 1 < g.length ? xa(g, b, e) : (g = g[0]).length > b || e ? g.slice(e, b + e) : g;
     } else {
       if (a < f) {
         return [];
@@ -593,7 +590,7 @@ function va(a, c, b, e, d, f, g, k) {
   }
   return g;
 }
-function ya(a, c, b) {
+function xa(a, c, b) {
   const e = [], d = C();
   let f;
   var g = a.length;
@@ -615,7 +612,7 @@ function ya(a, c, b) {
   }
   return e;
 }
-function za(a, c) {
+function ya(a, c) {
   const b = C(), e = [];
   for (let d = 0, f; d < c.length; d++) {
     f = c[d];
@@ -628,7 +625,7 @@ function za(a, c) {
   }
   return e;
 }
-;function Aa(a, c, b, e) {
+;function za(a, c, b, e) {
   if (!a.length) {
     return a;
   }
@@ -659,7 +656,7 @@ function za(a, c) {
   d = 1 < d.length ? [].concat.apply([], d) : d[0];
   return e ? W.call(this, d) : d;
 }
-;function Ba(a, c, b) {
+;function Aa(a, c, b) {
   var e = b[0];
   if (e.then) {
     return Promise.all(b).then(function(m) {
@@ -706,10 +703,10 @@ function za(a, c) {
   return {O:e, P:d, limit:f, offset:g, enrich:k, resolve:h, suggest:l};
 }
 ;X.prototype.or = function() {
-  const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f} = Ba(this, "or", arguments);
-  return Ca.call(this, a, c, b, e, d, f);
+  const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f} = Aa(this, "or", arguments);
+  return Ba.call(this, a, c, b, e, d, f);
 };
-function Ca(a, c, b, e, d, f) {
+function Ba(a, c, b, e, d, f) {
   if (c.length) {
     const g = this;
     return Promise.all(c).then(function(k) {
@@ -717,10 +714,10 @@ function Ca(a, c, b, e, d, f) {
       for (let h = 0, l; h < k.length; h++) {
         (l = k[h]).length && (a[h] = l);
       }
-      return Ca.call(g, a, [], b, e, d, f);
+      return Ba.call(g, a, [], b, e, d, f);
     });
   }
-  a.length && (this.result.length && a.push(this.result), 2 > a.length ? this.result = a[0] : (this.result = ya(a, b, e), e = 0));
+  a.length && (this.result.length && a.push(this.result), 2 > a.length ? this.result = a[0] : (this.result = xa(a, b, e), e = 0));
   return f ? this.resolve(b, e, d) : this;
 }
 ;X.prototype.and = function() {
@@ -730,11 +727,40 @@ function Ca(a, c, b, e, d, f) {
     f && (a = !!f.suggest, d = f.resolve, c = f.limit, b = f.offset, e = f.enrich && d);
   }
   if (a) {
-    const {O:f, P:g, limit:k, offset:h, enrich:l, resolve:m, suggest:n} = Ba(this, "and", arguments);
-    return Da.call(this, f, g, k, h, l, m, n);
+    const {O:f, P:g, limit:k, offset:h, enrich:l, resolve:m, suggest:n} = Aa(this, "and", arguments);
+    return Ca.call(this, f, g, k, h, l, m, n);
   }
   return d ? this.resolve(c, b, e) : this;
 };
+function Ca(a, c, b, e, d, f, g) {
+  if (c.length) {
+    const k = this;
+    return Promise.all(c).then(function(h) {
+      a = [];
+      for (let l = 0, m; l < h.length; l++) {
+        (m = h[l]).length && (a[l] = m);
+      }
+      return Ca.call(k, a, [], b, e, d, f, g);
+    });
+  }
+  if (a.length) {
+    if (this.result.length && a.unshift(this.result), 2 > a.length) {
+      this.result = a[0];
+    } else {
+      if (c = aa(a)) {
+        return this.result = wa(a, c, b, e, g), f ? d ? W.call(this.index, this.result) : this.result : this;
+      }
+      this.result = [];
+    }
+  } else {
+    g || (this.result = a);
+  }
+  return f ? this.resolve(b, e, d) : this;
+}
+;X.prototype.xor = function() {
+  const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f, suggest:g} = Aa(this, "xor", arguments);
+  return Da.call(this, a, c, b, e, d, f, g);
+};
 function Da(a, c, b, e, d, f, g) {
   if (c.length) {
     const k = this;
@@ -750,43 +776,14 @@ function Da(a, c, b, e, d, f, g) {
     if (this.result.length && a.unshift(this.result), 2 > a.length) {
       this.result = a[0];
     } else {
-      if (c = aa(a)) {
-        return this.result = xa(a, c, b, e, g), f ? d ? W.call(this.index, this.result) : this.result : this;
-      }
-      this.result = [];
+      return this.result = Ea.call(this, a, b, e, f, this.h), f ? d ? W.call(this.index, this.result) : this.result : this;
     }
   } else {
     g || (this.result = a);
   }
   return f ? this.resolve(b, e, d) : this;
 }
-;X.prototype.xor = function() {
-  const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f, suggest:g} = Ba(this, "xor", arguments);
-  return Ea.call(this, a, c, b, e, d, f, g);
-};
-function Ea(a, c, b, e, d, f, g) {
-  if (c.length) {
-    const k = this;
-    return Promise.all(c).then(function(h) {
-      a = [];
-      for (let l = 0, m; l < h.length; l++) {
-        (m = h[l]).length && (a[l] = m);
-      }
-      return Ea.call(k, a, [], b, e, d, f, g);
-    });
-  }
-  if (a.length) {
-    if (this.result.length && a.unshift(this.result), 2 > a.length) {
-      this.result = a[0];
-    } else {
-      return this.result = Fa.call(this, a, b, e, f, this.h), f ? d ? W.call(this.index, this.result) : this.result : this;
-    }
-  } else {
-    g || (this.result = a);
-  }
-  return f ? this.resolve(b, e, d) : this;
-}
-function Fa(a, c, b, e, d) {
+function Ea(a, c, b, e, d) {
   const f = [], g = C();
   let k = 0;
   for (let h = 0, l; h < a.length; h++) {
@@ -832,10 +829,10 @@ function Fa(a, c, b, e, d) {
   return f;
 }
 ;X.prototype.not = function() {
-  const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f, suggest:g} = Ba(this, "not", arguments);
-  return Ga.call(this, a, c, b, e, d, f, g);
+  const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f, suggest:g} = Aa(this, "not", arguments);
+  return Fa.call(this, a, c, b, e, d, f, g);
 };
-function Ga(a, c, b, e, d, f, g) {
+function Fa(a, c, b, e, d, f, g) {
   if (c.length) {
     const k = this;
     return Promise.all(c).then(function(h) {
@@ -843,17 +840,17 @@ function Ga(a, c, b, e, d, f, g) {
       for (let l = 0, m; l < h.length; l++) {
         (m = h[l]).length && (a[l] = m);
       }
-      return Ga.call(k, a, [], b, e, d, f, g);
+      return Fa.call(k, a, [], b, e, d, f, g);
     });
   }
   if (a.length && this.result.length) {
-    this.result = Ha.call(this, a, b, e, f);
+    this.result = Ga.call(this, a, b, e, f);
   } else if (f) {
     return this.resolve(b, e, d);
   }
   return f ? d ? W.call(this.index, this.result) : this.result : this;
 }
-function Ha(a, c, b, e) {
+function Ga(a, c, b, e) {
   const d = [];
   a = new Set(a.flat().flat());
   for (let f = 0, g, k = 0; f < this.result.length; f++) {
@@ -928,7 +925,7 @@ X.prototype.boost = function(a) {
 X.prototype.resolve = function(a, c, b) {
   const e = this.result, d = this.index;
   this.result = this.index = null;
-  return e.length ? ("object" === typeof a && (b = a.enrich, c = a.offset, a = a.limit), Aa.call(d, e, a || 100, c, b)) : e;
+  return e.length ? ("object" === typeof a && (b = a.enrich, c = a.offset, a = a.limit), za.call(d, e, a || 100, c, b)) : e;
 };
 C();
 V.prototype.search = function(a, c, b, e) {
@@ -989,7 +986,7 @@ V.prototype.search = function(a, c, b, e) {
         e = [];
         if (u.length) {
           for (f = 0; f < u.length; f += 2) {
-            y = Ia.call(this, u[f], u[f + 1], c, n, g), d.push({field:u[f], tag:u[f + 1], result:y});
+            y = Ha.call(this, u[f], u[f + 1], c, n, g), d.push({field:u[f], tag:u[f + 1], result:y});
           }
         }
         return e.length ? Promise.all(e).then(function(x) {
@@ -1023,7 +1020,7 @@ V.prototype.search = function(a, c, b, e) {
     if (m && F) {
       v = [];
       z = 0;
-      for (let G = 0, H, Za; G < m.length; G += 2) {
+      for (let G = 0, H, Ya; G < m.length; G += 2) {
         H = this.tag.get(m[G]);
         if (!H) {
           if (console.warn("Tag '" + m[G] + ":" + m[G + 1] + "' will be skipped because there is no field '" + m[G] + "'."), h) {
@@ -1032,14 +1029,14 @@ V.prototype.search = function(a, c, b, e) {
             return p ? d : new X(d);
           }
         }
-        if (Za = (H = H && H.get(m[G + 1])) && H.length) {
+        if (Ya = (H = H && H.get(m[G + 1])) && H.length) {
           z++, v.push(H);
         } else if (!h) {
           return p ? d : new X(d);
         }
       }
       if (z) {
-        r = za(r, v);
+        r = ya(r, v);
         F = r.length;
         if (!F && !h) {
           return p ? r : new X(r);
@@ -1074,9 +1071,9 @@ V.prototype.search = function(a, c, b, e) {
     }
     d[x] = {field:f[x], result:r};
   }
-  return k ? Ja(d, c) : q ? Ka(d, a, this.index, this.field, this.C, q) : d;
+  return k ? Ia(d, c) : q ? Ja(d, a, this.index, this.field, this.C, q) : d;
 };
-function Ka(a, c, b, e, d, f) {
+function Ja(a, c, b, e, d, f) {
   let g, k, h;
   for (let m = 0, n, t, p, q, y; m < a.length; m++) {
     n = a[m].result;
@@ -1118,7 +1115,7 @@ function Ka(a, c, b, e, d, f) {
   }
   return a;
 }
-function Ja(a, c) {
+function Ia(a, c) {
   const b = [], e = C();
   for (let d = 0, f, g; d < a.length; d++) {
     f = a[d];
@@ -1137,7 +1134,7 @@ function Ja(a, c) {
   }
   return b;
 }
-function Ia(a, c, b, e, d) {
+function Ha(a, c, b, e, d) {
   let f = this.tag.get(a);
   if (!f) {
     return console.warn("Tag '" + a + "' was not found"), [];
@@ -1169,23 +1166,24 @@ function W(a) {
   this.C = [];
   this.field = [];
   this.J = [];
-  this.key = (b = c.key || c.id) && La(b, this.J) || "id";
+  this.key = (b = c.key || c.id) && Ka(b, this.J) || "id";
   this.reg = (this.fastupdate = !!a.fastupdate) ? new Map() : new Set();
   this.A = (b = c.store || null) && b && !0 !== b && [];
   this.store = b && new Map();
   this.cache = (b = a.cache || null) && new Y(b);
   a.cache = !1;
+  this.priority = a.priority || 4;
   b = new Map();
   let e = c.index || c.field || c;
   D(e) && (e = [e]);
   for (let d = 0, f, g; d < e.length; d++) {
-    f = e[d], D(f) || (g = f, f = f.field), g = I(g) ? Object.assign({}, a, g) : a, b.set(f, new O(g, this.reg)), g.custom ? this.C[d] = g.custom : (this.C[d] = La(f, this.J), g.filter && ("string" === typeof this.C[d] && (this.C[d] = new String(this.C[d])), this.C[d].I = g.filter)), this.field[d] = f;
+    f = e[d], D(f) || (g = f, f = f.field), g = I(g) ? Object.assign({}, a, g) : a, b.set(f, new O(g, this.reg)), g.custom ? this.C[d] = g.custom : (this.C[d] = Ka(f, this.J), g.filter && ("string" === typeof this.C[d] && (this.C[d] = new String(this.C[d])), this.C[d].I = g.filter)), this.field[d] = f;
   }
   if (this.A) {
     a = c.store;
     D(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.U = g) : (this.A[d] = La(g, this.J), f.filter && ("string" === typeof this.A[d] && (this.A[d] = new String(this.A[d])), this.A[d].I = f.filter));
+      f = a[d], g = f.field || f, f.custom ? (this.A[d] = f.custom, f.custom.U = g) : (this.A[d] = Ka(g, this.J), f.filter && ("string" === typeof this.A[d] && (this.A[d] = new String(this.A[d])), this.A[d].I = f.filter));
     }
   }
   this.index = b;
@@ -1201,14 +1199,14 @@ function W(a) {
         if (!g) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
-        f.custom ? this.B[d] = f.custom : (this.B[d] = La(g, this.J), f.filter && ("string" === typeof this.B[d] && (this.B[d] = new String(this.B[d])), this.B[d].I = f.filter));
+        f.custom ? this.B[d] = f.custom : (this.B[d] = Ka(g, this.J), f.filter && ("string" === typeof this.B[d] && (this.B[d] = new String(this.B[d])), this.B[d].I = f.filter));
         this.T[d] = g;
         this.tag.set(g, new Map());
       }
     }
   }
 }
-function La(a, c) {
+function Ka(a, c) {
   const b = a.split(":");
   let e = 0;
   for (let d = 0; d < b.length; d++) {
@@ -1273,7 +1271,7 @@ w.set = function(a, c) {
   this.store.set(a, c);
   return this;
 };
-w.searchCache = Ma;
+w.searchCache = La;
 w.export = function(a, c, b = 0, e = 0) {
   if (b < this.field.length) {
     const g = this.field[b];
@@ -1294,22 +1292,18 @@ w.export = function(a, c, b = 0, e = 0) {
       break;
     case 1:
       d = "tag";
-      f = qa(this.tag, this.reg.size);
+      f = this.tag && qa(this.tag, this.reg.size);
       c = null;
       break;
     case 2:
       d = "doc";
-      f = oa(this.store);
+      f = this.store && oa(this.store);
       c = null;
       break;
-    case 3:
-      d = "cfg";
-      c = f = null;
-      break;
     default:
       return;
   }
-  return ua.call(this, a, c, d, f, b, e);
+  return U.call(this, a, c, d, f, b, e);
 };
 w.import = function(a, c) {
   var b = a.split(".");
@@ -1338,7 +1332,7 @@ w.import = function(a, c) {
   }
 };
 ja(V.prototype);
-function Ma(a, c, b) {
+function La(a, c, b) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
   this.cache || (this.cache = new Y());
   let e = this.cache.get(a);
@@ -1379,31 +1373,31 @@ Y.prototype.clear = function() {
   this.cache.clear();
   this.h = "";
 };
-const Na = {normalize:function(a) {
+const Ma = {normalize:function(a) {
   return a.toLowerCase();
 }};
-const Oa = 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 Pa = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), Qa = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
-const Ra = {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 Na = 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 Oa = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), Pa = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
+const Qa = {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 Ra = /[\x00-\x7F]+/g;
 const Sa = /[\x00-\x7F]+/g;
 const Ta = /[\x00-\x7F]+/g;
-const Ua = /[\x00-\x7F]+/g;
-var Va = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:Na, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:Oa}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:Oa, matcher:Pa, replacer:Qa}, LatinExtra:{normalize:!0, dedupe:!0, mapper:Oa, replacer:Qa.concat([/(?!^)[aeo]/g, ""]), matcher:Pa}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
+var Ua = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:Ma, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:Na}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:Na, matcher:Oa, replacer:Pa}, LatinExtra:{normalize:!0, dedupe:!0, mapper:Na, replacer:Pa.concat([/(?!^)[aeo]/g, ""]), matcher:Oa}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
   for (let b = 0; b < a.length; b++) {
     var c = a[b];
-    let e = c.charAt(0), d = Ra[e];
-    for (let f = 1, g; f < c.length && (g = c.charAt(f), "h" === g || "w" === g || !(g = Ra[g]) || g === d || (e += g, d = g, 4 !== e.length)); f++) {
+    let e = c.charAt(0), d = Qa[e];
+    for (let f = 1, g; f < c.length && (g = c.charAt(f), "h" === g || "w" === g || !(g = Qa[g]) || g === d || (e += g, d = g, 4 !== e.length)); f++) {
     }
     a[b] = e;
   }
 }}, ArabicDefault:{rtl:!0, normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(Sa, " ");
+  return ("" + a).replace(Ra, " ");
 }}, CjkDefault:{normalize:!1, dedupe:!0, split:"", prepare:function(a) {
-  return ("" + a).replace(Ta, "");
+  return ("" + a).replace(Sa, "");
 }}, CyrillicDefault:{normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(Ua, " ");
+  return ("" + a).replace(Ta, " ");
 }}};
-const Wa = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
+const Va = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
 O.prototype.add = function(a, c, b, e) {
   if (c && (a || 0 === a)) {
     if (!e && !b && this.reg.has(a)) {
@@ -1416,14 +1410,14 @@ O.prototype.add = function(a, c, b, e) {
         let q = c[this.rtl ? e - 1 - p : p];
         var d = q.length;
         if (d && (n || !m[q])) {
-          var f = this.score ? this.score(c, q, p, null, 0) : Xa(t, e, p), g = "";
+          var f = this.score ? this.score(c, q, p, null, 0) : Wa(t, e, p), g = "";
           switch(this.tokenize) {
             case "full":
               if (2 < d) {
                 for (f = 0; f < d; f++) {
                   for (var k = d; k > f; k--) {
                     g = q.substring(f, k);
-                    var h = this.score ? this.score(c, q, p, g, f) : Xa(t, e, p, d, f);
+                    var h = this.score ? this.score(c, q, p, g, f) : Wa(t, e, p, d, f);
                     Z(this, m, g, h, a, b);
                   }
                 }
@@ -1432,7 +1426,7 @@ O.prototype.add = function(a, c, b, e) {
             case "reverse":
               if (1 < d) {
                 for (k = d - 1; 0 < k; k--) {
-                  g = q[k] + g, h = this.score ? this.score(c, q, p, g, k) : Xa(t, e, p, d, k), Z(this, m, g, h, a, b);
+                  g = q[k] + g, h = this.score ? this.score(c, q, p, g, k) : Wa(t, e, p, d, k), Z(this, m, g, h, a, b);
                 }
                 g = "";
               }
@@ -1448,7 +1442,7 @@ O.prototype.add = function(a, c, b, e) {
                 for (d = C(), g = this.S, f = q, k = Math.min(n + 1, e - p), d[f] = 1, h = 1; h < k; h++) {
                   if ((q = c[this.rtl ? e - 1 - p - h : p + h]) && !d[q]) {
                     d[q] = 1;
-                    const y = this.score ? this.score(c, f, p, q, h) : Xa(g + (e / 2 > g ? 0 : 1), e, p, k - 1, h - 1), u = this.bidirectional && q > f;
+                    const y = this.score ? this.score(c, f, p, q, h) : Wa(g + (e / 2 > g ? 0 : 1), e, p, k - 1, h - 1), u = this.bidirectional && q > f;
                     Z(this, l, u ? f : q, y, a, b, u ? q : f);
                   }
                 }
@@ -1467,7 +1461,7 @@ function Z(a, c, b, e, d, f, g) {
     g ? (c = h || (c[b] = C()), c[g] = 1, (h = k.get(g)) ? k = h : k.set(g, k = new Map())) : c[b] = 1, (h = k.get(b)) ? k = h : k.set(b, k = []), k = k[e] || (k[e] = []), f && k.includes(d) || (k.push(d), a.fastupdate && ((c = a.reg.get(d)) ? c.push(k) : a.reg.set(d, [k])));
   }
 }
-function Xa(a, c, b, e, d) {
+function Wa(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;
 }
 ;O.prototype.search = function(a, c, b) {
@@ -1488,11 +1482,11 @@ function Xa(a, c, b, e, d) {
   b = a.length;
   c = c || (k ? 100 : 0);
   if (1 === b) {
-    return g = c, (c = Ya(this, a[0], "")) && c.length ? Aa.call(this, c, g, d) : [];
+    return g = c, (c = Xa(this, a[0], "")) && c.length ? za.call(this, c, g, d) : [];
   }
   f = this.depth && !1 !== f;
   if (2 === b && f && !g) {
-    return g = c, (c = Ya(this, a[0], a[1])) && c.length ? Aa.call(this, c, g, d) : [];
+    return g = c, (c = Xa(this, a[0], a[1])) && c.length ? za.call(this, c, g, d) : [];
   }
   k = C();
   let l = 0;
@@ -1504,7 +1498,7 @@ function Xa(a, c, b, e, d) {
   for (let q, y; l < b; l++) {
     if ((y = a[l]) && !k[y]) {
       k[y] = 1;
-      q = Ya(this, y, m);
+      q = Xa(this, y, m);
       a: {
         f = q;
         var n = e, t = g, p = h;
@@ -1541,16 +1535,16 @@ function Xa(a, c, b, e, d) {
     e = a.length;
     m = a;
     if (1 < e) {
-      m = xa(a, h, c, d, g);
+      m = wa(a, h, c, d, g);
     } else if (1 === e) {
-      g = Aa.call(null, a[0], c, d);
+      g = za.call(null, a[0], c, d);
       break a;
     }
     g = m;
   }
   return g;
 };
-function Ya(a, c, b) {
+function Xa(a, c, b) {
   let e;
   b && (e = a.bidirectional && c > b) && (e = b, b = c, c = e);
   a = b ? (a = a.ctx.get(b)) && a.get(c) : a.map.get(c);
@@ -1571,14 +1565,14 @@ function Ya(a, c, b) {
         }
       }
     } else {
-      $a(this.map, a), this.depth && $a(this.ctx, a);
+      Za(this.map, a), this.depth && Za(this.ctx, a);
     }
     c || this.reg.delete(a);
   }
   this.cache && this.cache.remove(a);
   return this;
 };
-function $a(a, c) {
+function Za(a, c) {
   let b = 0;
   if (a.constructor === Array) {
     for (let e = 0, d, f; e < a.length; e++) {
@@ -1593,7 +1587,7 @@ function $a(a, c) {
     }
   } else {
     for (let e of a.entries()) {
-      const d = e[0], f = $a(e[1], c);
+      const d = e[0], f = Za(e[1], c);
       f ? b += f : a.delete(d);
     }
   }
@@ -1605,12 +1599,12 @@ function $a(a, c) {
   }
   if (a) {
     var b = D(a) ? a : a.preset;
-    b && (Wa[b] || console.warn("Preset not found: " + b), a = Object.assign({}, Wa[b], a));
+    b && (Va[b] || console.warn("Preset not found: " + b), a = Object.assign({}, Va[b], a));
   } else {
     a = {};
   }
   b = a.context;
-  const e = !0 === b ? {depth:1} : b || {}, d = D(a.encoder) ? Va[a.encoder] : a.encode || a.encoder || Na;
+  const e = !0 === b ? {depth:1} : b || {}, d = D(a.encoder) ? Ua[a.encoder] : a.encode || a.encoder || Ma;
   this.encoder = d.encode ? d : "object" === typeof d ? new K(d) : {encode:d};
   this.resolution = a.resolution || 9;
   this.tokenize = (b = a.tokenize) && "default" !== b && b || "strict";
@@ -1645,7 +1639,7 @@ w.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 ab(a) {
+function $a(a) {
   let c = 0;
   if (a.constructor === Array) {
     for (let b = 0, e; b < a.length; b++) {
@@ -1653,7 +1647,7 @@ function ab(a) {
     }
   } else {
     for (const b of a) {
-      const e = b[0], d = ab(b[1]);
+      const e = b[0], d = $a(b[1]);
       d ? c += d : a.delete(e);
     }
   }
@@ -1663,11 +1657,11 @@ w.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
-  ab(this.map);
-  this.depth && ab(this.ctx);
+  $a(this.map);
+  this.depth && $a(this.ctx);
   return this;
 };
-w.searchCache = Ma;
+w.searchCache = La;
 w.export = function(a, c, b = 0, e = 0) {
   let d, f;
   switch(e) {
@@ -1690,7 +1684,7 @@ w.export = function(a, c, b = 0, e = 0) {
     default:
       return;
   }
-  return ua.call(this, a, c, d, f, b, e);
+  return U.call(this, a, c, d, f, b, e);
 };
 w.import = function(a, c) {
   if (c) {
@@ -1758,9 +1752,9 @@ w.serialize = function(a = !0) {
   return a ? "function inject(index){" + c + e + d + "}" : c + e + d;
 };
 ja(O.prototype);
-const bb = {Index:O, Charset:Va, Encoder:K, Document:V, Worker:null, Resolver:null, IndexedDB:null, Language:{}}, cb = "undefined" !== typeof self ? self : "undefined" !== typeof global ? global : "undefined" !== typeof window ? window : {};
-let db;
-(db = cb.define) && db.amd ? db([], function() {
-  return bb;
-}) : "object" === typeof cb.exports ? cb.exports = bb : cb.FlexSearch = bb;
+const ab = {Index:O, Charset:Ua, Encoder:K, Document:V, Worker:null, Resolver:null, IndexedDB:null, Language:{}}, bb = "undefined" !== typeof self ? self : "undefined" !== typeof global ? global : "undefined" !== typeof window ? window : {};
+let cb;
+(cb = bb.define) && cb.amd ? cb([], function() {
+  return ab;
+}) : "object" === typeof bb.exports ? bb.exports = ab : bb.FlexSearch = ab;
 }(this||self));
diff --git a/dist/flexsearch.compact.min.js b/dist/flexsearch.compact.min.js
index aa4981d..c1a4597 100644
--- a/dist/flexsearch.compact.min.js
+++ b/dist/flexsearch.compact.min.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.115 (Bundle)
+ * FlexSearch.js v0.8.117 (Bundle)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -21,49 +21,49 @@ v.addMatcher=function(a,c){if("object"===typeof a)return this.addReplacer(a,c);i
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 [],e=this.split||""===this.split?a.split(this.split):a;for(let f=0,g,k;f<e.length;f++)if((g=k=e[f])&&!(g.length<this.minlength))if(c)b.push(g);else if(!this.filter||!this.filter.has(g)){if(this.cache&&g.length<=this.L)if(this.H){var d=this.G.get(g);if(d||""===d){d&&b.push(d);continue}}else this.H=setTimeout(L,50,this);this.stemmer&&2<g.length&&(this.N||(this.N=new RegExp("(?!^)("+this.D+")$")),g=g.replace(this.N,h=>this.stemmer.get(h)),g.length<this.minlength||this.filter&&this.filter.has(g))&&(g=
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-this.R&&(this.G.clear(),this.L=this.L/1.1|0));g&&b.push(g)}this.finalize&&(b=this.finalize(b)||b);this.cache&&a.length<=this.K&&(this.F.set(a,b),this.F.size>this.R&&(this.F.clear(),this.K=this.K/1.1|0));return b};function L(a){a.H=null;a.F.clear();a.G.clear()};let M,N;async function ia(a){a=a.data;var c=a.task;const b=a.id;let e=a.args;switch(c){case "init":N=a.options||{};(c=a.factory)?(Function("return "+c)()(self),M=new self.FlexSearch.Index(N),delete self.FlexSearch):M=new O(N);postMessage({id:b});break;default:let d;"export"===c&&(e[1]?(e[0]=N.export,e[2]=0,e[3]=1):e=null);"import"===c?e[0]&&(a=await N.import.call(M,e[0]),M.import(e[0],a)):(d=e&&M[c].apply(M,e))&&d.then&&(d=await d);postMessage("search"===c?{id:b,msg:d}:{id:b})}};function ja(a){P.call(a,"add");P.call(a,"append");P.call(a,"search");P.call(a,"update");P.call(a,"remove")}let Q,ka;const R={},S={};function la(a){Q=0;R[a]=S[a]}
-function P(a){this[a+"Async"]=function(){const c=arguments;var b=c[c.length-1];let e;"function"===typeof b&&(e=b,delete c[c.length-1]);Q||(Q=setTimeout(la,0,a),ka=Date.now());S[a]||(S[a]=R[a]=1E3);if(!--R[a]){R[a]=S[a]=S[a]*this.priority*this.priority*3/(Date.now()-ka)|0||1;Q=clearTimeout(Q);const f=this;return new Promise(g=>{setTimeout(function(){g(f[a+"Async"].apply(f,c))},0)})}const d=this[a].apply(this,c);b=d.then?d:new Promise(f=>f(d));e&&b.then(e);return b}};let T=0;
-function ma(a={}){function c(g){function k(h){h=h.data||h;const l=h.id,m=l&&d.h[l];m&&(m(h.msg),delete d.h[l])}this.worker=g;this.h=C();if(this.worker){e?this.worker.on("message",k):this.worker.onmessage=k;if(a.config)return new Promise(function(h){d.h[++T]=function(){h(d)};d.worker.postMessage({id:T,task:"init",factory:b,options:a})});this.worker.postMessage({task:"init",factory:b,options:a});return this}}if(!this||this.constructor!==ma)return new ma(a);let b="undefined"!==typeof self?self._factory:"undefined"!==
-typeof window?window._factory:null;b&&(b=b.toString());const e="undefined"===typeof window,d=this,f=na(b,e,a.worker);return f.then?f.then(function(g){return c.call(d,g)}):c.call(this,f)}U("add");U("append");U("search");U("update");U("remove");U("clear");U("export");U("import");ja(ma.prototype);
-function U(a){ma.prototype[a]=function(){const c=this,b=[].slice.call(arguments);var e=b[b.length-1];let d;"function"===typeof e&&(d=e,b.pop());e=new Promise(function(f){"export"===a&&"function"===typeof b[0]&&(b[0]=null);c.h[++T]=f;c.worker.postMessage({task:a,id:T,args:b})});return d?(e.then(d),this):e}}
+this.R&&(this.G.clear(),this.L=this.L/1.1|0));g&&b.push(g)}this.finalize&&(b=this.finalize(b)||b);this.cache&&a.length<=this.K&&(this.F.set(a,b),this.F.size>this.R&&(this.F.clear(),this.K=this.K/1.1|0));return b};function L(a){a.H=null;a.F.clear();a.G.clear()};let M,N;async function ia(a){a=a.data;var c=a.task;const b=a.id;let e=a.args;switch(c){case "init":N=a.options||{};(c=a.factory)?(Function("return "+c)()(self),M=new self.FlexSearch.Index(N),delete self.FlexSearch):M=new O(N);postMessage({id:b});break;default:let d;"export"===c&&(e[1]?(e[0]=N.export,e[2]=0,e[3]=1):e=null);"import"===c?e[0]&&(a=await N.import.call(M,e[0]),M.import(e[0],a)):(d=e&&M[c].apply(M,e))&&d.then&&(d=await d);postMessage("search"===c?{id:b,msg:d}:{id:b})}};function ja(a){P.call(a,"add");P.call(a,"append");P.call(a,"search");P.call(a,"update");P.call(a,"remove")}let ka,la,Q;function ma(){ka=Q=0}
+function P(a){this[a+"Async"]=function(){const c=arguments;var b=c[c.length-1];let e;"function"===typeof b&&(e=b,delete c[c.length-1]);ka?Q||(Q=Date.now()-la>=this.priority*this.priority*3):(ka=setTimeout(ma,0),la=Date.now());if(Q){const f=this;return new Promise(g=>{setTimeout(function(){g(f[a+"Async"].apply(f,c))},0)})}const d=this[a].apply(this,c);b=d.then?d:new Promise(f=>f(d));e&&b.then(e);return b}};let R=0;
+function S(a={}){function c(g){function k(h){h=h.data||h;const l=h.id,m=l&&d.h[l];m&&(m(h.msg),delete d.h[l])}this.worker=g;this.h=C();if(this.worker){e?this.worker.on("message",k):this.worker.onmessage=k;if(a.config)return new Promise(function(h){d.h[++R]=function(){h(d);1E9<R&&(R=0)};d.worker.postMessage({id:R,task:"init",factory:b,options:a})});this.worker.postMessage({task:"init",factory:b,options:a});this.priority=a.priority||4;return this}}if(!this||this.constructor!==S)return new S(a);let b=
+"undefined"!==typeof self?self._factory:"undefined"!==typeof window?window._factory:null;b&&(b=b.toString());const e="undefined"===typeof window,d=this,f=na(b,e,a.worker);return f.then?f.then(function(g){return c.call(d,g)}):c.call(this,f)}T("add");T("append");T("search");T("update");T("remove");T("clear");T("export");T("import");ja(S.prototype);
+function T(a){S.prototype[a]=function(){const c=this,b=[].slice.call(arguments);var e=b[b.length-1];let d;"function"===typeof e&&(d=e,b.pop());e=new Promise(function(f){"export"===a&&"function"===typeof b[0]&&(b[0]=null);c.h[++R]=f;c.worker.postMessage({task:a,id:R,args:b})});return d?(e.then(d),this):e}}
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+g||"w"===g||!(g=Qa[g])||g===d||(e+=g,d=g,4!==e.length));f++);a[b]=e}}},ArabicDefault:{rtl:!0,normalize:!1,dedupe:!0,prepare:function(a){return(""+a).replace(Ra," ")}},CjkDefault:{normalize:!1,dedupe:!0,split:"",prepare:function(a){return(""+a).replace(Sa,"")}},CyrillicDefault:{normalize:!1,dedupe:!0,prepare:function(a){return(""+a).replace(Ta," ")}}};const Va={memory:{resolution:1},performance:{resolution:6,fastupdate:!0,context:{depth:1,resolution:3}},match:{tokenize:"forward"},score:{resolution:9,context:{depth:2,resolution:9}}};O.prototype.add=function(a,c,b,e){if(c&&(a||0===a)){if(!e&&!b&&this.reg.has(a))return this.update(a,c);c=this.encoder.encode(c);if(e=c.length){const l=C(),m=C(),n=this.depth,t=this.resolution;for(let p=0;p<e;p++){let q=c[this.rtl?e-1-p:p];var d=q.length;if(d&&(n||!m[q])){var f=this.score?this.score(c,q,p,null,0):Wa(t,e,p),g="";switch(this.tokenize){case "full":if(2<d){for(f=0;f<d;f++)for(var k=d;k>f;k--){g=q.substring(f,k);var h=this.score?this.score(c,q,p,g,f):Wa(t,e,p,d,f);Z(this,m,g,h,a,b)}break}case "reverse":if(1<
+d){for(k=d-1;0<k;k--)g=q[k]+g,h=this.score?this.score(c,q,p,g,k):Wa(t,e,p,d,k),Z(this,m,g,h,a,b);g=""}case "forward":if(1<d){for(k=0;k<d;k++)g+=q[k],Z(this,m,g,f,a,b);break}default:if(Z(this,m,q,f,a,b),n&&1<e&&p<e-1)for(d=C(),g=this.S,f=q,k=Math.min(n+1,e-p),d[f]=1,h=1;h<k;h++)if((q=c[this.rtl?e-1-p-h:p+h])&&!d[q]){d[q]=1;const y=this.score?this.score(c,f,p,q,h):Wa(g+(e/2>g?0:1),e,p,k-1,h-1),w=this.bidirectional&&q>f;Z(this,l,w?f:q,y,a,b,w?q:f)}}}}this.fastupdate||this.reg.add(a)}}return this};
+function Z(a,c,b,e,d,f,g){let k=g?a.ctx:a.map,h;if(!c[b]||g&&!(h=c[b])[g])g?(c=h||(c[b]=C()),c[g]=1,(h=k.get(g))?k=h:k.set(g,k=new Map)):c[b]=1,(h=k.get(b))?k=h:k.set(b,k=[]),k=k[e]||(k[e]=[]),f&&k.includes(d)||(k.push(d),a.fastupdate&&((c=a.reg.get(d))?c.push(k):a.reg.set(d,[k])))}function Wa(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};O.prototype.search=function(a,c,b){b||(!c&&H(a)?(b=a,a=""):H(c)&&(b=c,c=0));var e=[],d=0;if(b){a=b.query||a;c=b.limit||c;d=b.offset||0;var f=b.context;var g=b.suggest;var k=!0;var h=b.resolution}else k=!0;a=this.encoder.encode(a);b=a.length;c=c||(k?100:0);if(1===b)return g=c,(c=Ya(this,a[0],""))&&c.length?za.call(this,c,g,d):[];f=this.depth&&!1!==f;if(2===b&&f&&!g)return g=c,(c=Ya(this,a[0],a[1]))&&c.length?za.call(this,c,g,d):[];k=C();let l=0;if(1<b&&f){var m=a[0];l=1}h||0===h||(h=m?this.S:this.resolution);
+for(let q,y;l<b;l++){if((y=a[l])&&!k[y]){k[y]=1;q=Ya(this,y,m);a:{f=q;var n=e,t=g,p=h;let w=[];if(f&&f.length){if(f.length<=p){n.push(f);q=void 0;break a}for(let u=0,z;u<p;u++)if(z=f[u])w[u]=z;if(w.length){n.push(w);q=void 0;break a}}q=t?void 0:w}if(q){e=q;break}m&&(g&&q&&e.length||(m=y))}g&&m&&l===b-1&&!e.length&&(m="",l=-1,k=C())}a:{a=e;e=a.length;m=a;if(1<e)m=wa(a,h,c,d,g);else if(1===e){g=za.call(null,a[0],c,d);break a}g=m}return g};
+function Ya(a,c,b){let e;b&&(e=a.bidirectional&&c>b)&&(e=b,b=c,c=e);a=b?(a=a.ctx.get(b))&&a.get(c):a.map.get(c);return a};O.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 e=0,d;e<b.length;e++){if(d=b[e])if(2>d.length)d.pop();else{const f=d.indexOf(a);f===b.length-1?d.pop():d.splice(f,1)}}else Za(this.map,a),this.depth&&Za(this.ctx,a);c||this.reg.delete(a)}this.cache&&this.cache.remove(a);return this};
+function Za(a,c){let b=0;if(a.constructor===Array)for(let e=0,d,f;e<a.length;e++){if((d=a[e])&&d.length)if(f=d.indexOf(c),0<=f){1<d.length?(d.splice(f,1),b++):delete a[e];break}else b++}else for(let e of a.entries()){const d=e[0],f=Za(e[1],c);f?b+=f:a.delete(d)}return b};function O(a,c){if(!this||this.constructor!==O)return new O(a);if(a){var b=D(a)?a:a.preset;b&&(a=Object.assign({},Va[b],a))}else a={};b=a.context;const e=!0===b?{depth:1}:b||{},d=D(a.encoder)?Ua[a.encoder]:a.encode||a.encoder||Ma;this.encoder=d.encode?d:"object"===typeof d?new K(d):{encode:d};this.resolution=a.resolution||9;this.tokenize=(b=a.tokenize)&&"default"!==b&&b||"strict";this.depth="strict"===b&&e.depth||0;this.bidirectional=!1!==e.bidirectional;this.fastupdate=!!a.fastupdate;this.score=
 a.score||null;b=!1;this.map=new Map;this.ctx=new Map;this.reg=c||(this.fastupdate?new Map:new Set);this.S=e.resolution||3;this.rtl=d.rtl||a.rtl||!1;this.cache=(b=a.cache||null)&&new Y(b);this.priority=a.priority||4}v=O.prototype;v.clear=function(){this.map.clear();this.ctx.clear();this.reg.clear();this.cache&&this.cache.clear();return this};v.append=function(a,c){return this.add(a,c,!0)};v.contain=function(a){return this.reg.has(a)};
-v.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 ab(a){let c=0;if(a.constructor===Array)for(let b=0,e;b<a.length;b++)(e=a[b])&&(c+=e.length);else for(const b of a){const e=b[0],d=ab(b[1]);d?c+=d:a.delete(e)}return c}v.cleanup=function(){if(!this.fastupdate)return this;ab(this.map);this.depth&&ab(this.ctx);return this};v.searchCache=Ma;
-v.export=function(a,c,b=0,e=0){let d,f;switch(e){case 0:d="reg";f=sa(this.reg);break;case 1:d="cfg";f=null;break;case 2:d="map";f=oa(this.map,this.reg.size);break;case 3:d="ctx";f=qa(this.ctx,this.reg.size);break;default:return}return ua.call(this,a,c,d,f,b,e)};
+v.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 $a(a){let c=0;if(a.constructor===Array)for(let b=0,e;b<a.length;b++)(e=a[b])&&(c+=e.length);else for(const b of a){const e=b[0],d=$a(b[1]);d?c+=d:a.delete(e)}return c}v.cleanup=function(){if(!this.fastupdate)return this;$a(this.map);this.depth&&$a(this.ctx);return this};v.searchCache=La;
+v.export=function(a,c,b=0,e=0){let d,f;switch(e){case 0:d="reg";f=sa(this.reg);break;case 1:d="cfg";f=null;break;case 2:d="map";f=oa(this.map,this.reg.size);break;case 3:d="ctx";f=qa(this.ctx,this.reg.size);break;default:return}return U.call(this,a,c,d,f,b,e)};
 v.import=function(a,c){if(c)switch("string"===typeof c&&(c=JSON.parse(c)),a=a.split("."),"json"===a[a.length-1]&&a.pop(),3===a.length&&a.shift(),a=1<a.length?a[1]:a[0],a){case "reg":this.fastupdate=!1;this.reg=ta(c,this.reg);break;case "map":this.map=pa(c,this.map);break;case "ctx":this.ctx=ra(c,this.ctx)}};
 v.serialize=function(a=!0){if(!this.reg.size)return"";let c="",b="";for(var e of this.reg.keys())b||(b=typeof e),c+=(c?",":"")+("string"===b?'"'+e+'"':e);c="index.reg=new Set(["+c+"]);";e="";for(var d of this.map.entries()){var f=d[0],g=d[1],k="";for(let m=0,n;m<g.length;m++){n=g[m]||[""];var h="";for(var l=0;l<n.length;l++)h+=(h?",":"")+("string"===b?'"'+n[l]+'"':n[l]);h="["+h+"]";k+=(k?",":"")+h}k='["'+f+'",['+k+"]]";e+=(e?",":"")+k}e="index.map=new Map(["+e+"]);";d="";for(const m of this.ctx.entries()){f=
-m[0];g=m[1];for(const n of g.entries()){g=n[0];k=n[1];h="";for(let t=0,p;t<k.length;t++){p=k[t]||[""];l="";for(let q=0;q<p.length;q++)l+=(l?",":"")+("string"===b?'"'+p[q]+'"':p[q]);l="["+l+"]";h+=(h?",":"")+l}h='new Map([["'+g+'",['+h+"]]])";h='["'+f+'",'+h+"]";d+=(d?",":"")+h}}d="index.ctx=new Map(["+d+"]);";return a?"function inject(index){"+c+e+d+"}":c+e+d};ja(O.prototype);const bb={Index:O,Charset:Va,Encoder:K,Document:V,Worker:null,Resolver:null,IndexedDB:null,Language:{}},cb="undefined"!==typeof self?self:"undefined"!==typeof global?global:"undefined"!==typeof window?window:{};let db;(db=cb.define)&&db.amd?db([],function(){return bb}):"object"===typeof cb.exports?cb.exports=bb:cb.FlexSearch=bb;}(this||self));
+m[0];g=m[1];for(const n of g.entries()){g=n[0];k=n[1];h="";for(let t=0,p;t<k.length;t++){p=k[t]||[""];l="";for(let q=0;q<p.length;q++)l+=(l?",":"")+("string"===b?'"'+p[q]+'"':p[q]);l="["+l+"]";h+=(h?",":"")+l}h='new Map([["'+g+'",['+h+"]]])";h='["'+f+'",'+h+"]";d+=(d?",":"")+h}}d="index.ctx=new Map(["+d+"]);";return a?"function inject(index){"+c+e+d+"}":c+e+d};ja(O.prototype);const ab={Index:O,Charset:Ua,Encoder:K,Document:V,Worker:null,Resolver:null,IndexedDB:null,Language:{}},bb="undefined"!==typeof self?self:"undefined"!==typeof global?global:"undefined"!==typeof window?window:{};let cb;(cb=bb.define)&&cb.amd?cb([],function(){return ab}):"object"===typeof bb.exports?bb.exports=ab:bb.FlexSearch=ab;}(this||self));
diff --git a/dist/flexsearch.compact.module.debug.js b/dist/flexsearch.compact.module.debug.js
index 2c6e1f5..c8440dc 100644
--- a/dist/flexsearch.compact.module.debug.js
+++ b/dist/flexsearch.compact.module.debug.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.115 (Bundle/Debug)
+ * FlexSearch.js v0.8.117 (Bundle/Debug)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -299,11 +299,9 @@ async function ia(a) {
   P.call(a, "update");
   P.call(a, "remove");
 }
-let Q, ka;
-const R = {}, S = {};
-function la(a) {
-  Q = 0;
-  R[a] = S[a];
+let ka, la, Q;
+function ma() {
+  ka = Q = 0;
 }
 function P(a) {
   this[a + "Async"] = function() {
@@ -311,11 +309,8 @@ function P(a) {
     var b = c[c.length - 1];
     let e;
     "function" === typeof b && (e = b, delete c[c.length - 1]);
-    Q || (Q = setTimeout(la, 0, a), ka = Date.now());
-    S[a] || (S[a] = R[a] = 1000);
-    if (!--R[a]) {
-      R[a] = S[a] = S[a] * this.priority * this.priority * 3 / (Date.now() - ka) | 0 || 1;
-      Q = clearTimeout(Q);
+    ka ? Q || (Q = Date.now() - la >= this.priority * this.priority * 3) : (ka = setTimeout(ma, 0), la = Date.now());
+    if (Q) {
       const f = this;
       return new Promise(g => {
         setTimeout(function() {
@@ -329,8 +324,8 @@ function P(a) {
     return b;
   };
 }
-;let T = 0;
-function ma(a = {}) {
+;let R = 0;
+function S(a = {}) {
   function c(g) {
     function k(h) {
       h = h.data || h;
@@ -343,18 +338,20 @@ function ma(a = {}) {
       e ? this.worker.on("message", k) : this.worker.onmessage = k;
       if (a.config) {
         return new Promise(function(h) {
-          d.h[++T] = function() {
+          d.h[++R] = function() {
             h(d);
+            1e9 < R && (R = 0);
           };
-          d.worker.postMessage({id:T, task:"init", factory:b, options:a});
+          d.worker.postMessage({id:R, task:"init", factory:b, options:a});
         });
       }
       this.worker.postMessage({task:"init", factory:b, options:a});
+      this.priority = a.priority || 4;
       return this;
     }
   }
-  if (!this || this.constructor !== ma) {
-    return new ma(a);
+  if (!this || this.constructor !== S) {
+    return new S(a);
   }
   let b = "undefined" !== typeof self ? self._factory : "undefined" !== typeof window ? window._factory : null;
   b && (b = b.toString());
@@ -363,25 +360,25 @@ function ma(a = {}) {
     return c.call(d, g);
   }) : c.call(this, f);
 }
-U("add");
-U("append");
-U("search");
-U("update");
-U("remove");
-U("clear");
-U("export");
-U("import");
-ja(ma.prototype);
-function U(a) {
-  ma.prototype[a] = function() {
+T("add");
+T("append");
+T("search");
+T("update");
+T("remove");
+T("clear");
+T("export");
+T("import");
+ja(S.prototype);
+function T(a) {
+  S.prototype[a] = function() {
     const c = this, b = [].slice.call(arguments);
     var e = b[b.length - 1];
     let d;
     "function" === typeof e && (d = e, b.pop());
     e = new Promise(function(f) {
       "export" === a && "function" === typeof b[0] && (b[0] = null);
-      c.h[++T] = f;
-      c.worker.postMessage({task:a, id:T, args:b});
+      c.h[++R] = f;
+      c.worker.postMessage({task:a, id:R, args:b});
     });
     return d ? (e.then(d), this) : e;
   };
@@ -437,7 +434,7 @@ function ta(a, c) {
   }
   return c;
 }
-function ua(a, c, b, e, d, f, g = 0) {
+function U(a, c, b, e, d, f, g = 0) {
   const k = e && e.constructor === Array;
   var h = k ? e.shift() : e;
   if (!h) {
@@ -446,10 +443,10 @@ function ua(a, c, b, e, d, f, g = 0) {
   if ((h = a((c ? c + "." : "") + (g + 1) + "." + b, JSON.stringify(h))) && h.then) {
     const l = this;
     return h.then(function() {
-      return ua.call(l, a, c, b, k ? e : null, d, f, g + 1);
+      return U.call(l, a, c, b, k ? e : null, d, f, g + 1);
     });
   }
-  return ua.call(this, a, c, b, k ? e : null, d, f, g + 1);
+  return U.call(this, a, c, b, k ? e : null, d, f, g + 1);
 }
 ;V.prototype.add = function(a, c, b) {
   I(a) && (c = a, a = J(c, this.key));
@@ -465,7 +462,7 @@ function ua(a, c, b, e, d, f, g = 0) {
         d && e.add(a, d, !1, !0);
       } else {
         if (d = h.I, !d || d(c)) {
-          h.constructor === String ? h = ["" + h] : D(h) && (h = [h]), va(c, h, this.J, 0, e, a, h[0], b);
+          h.constructor === String ? h = ["" + h] : D(h) && (h = [h]), ua(c, h, this.J, 0, e, a, h[0], b);
         }
       }
     }
@@ -516,7 +513,7 @@ function ua(a, c, b, e, d, f, g = 0) {
             k[l] = c[l];
             continue;
           }
-          wa(c, k, l, 0, l[0], m);
+          va(c, k, l, 0, l[0], m);
         }
       }
       this.store.set(a, k || c);
@@ -524,21 +521,21 @@ function ua(a, c, b, e, d, f, g = 0) {
   }
   return this;
 };
-function wa(a, c, b, e, d, f) {
+function va(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++) {
-        wa(a, c, b, e, d);
+        va(a, c, b, e, d);
       }
     } else {
-      c = c[d] || (c[d] = C()), d = b[++e], wa(a, c, b, e, d);
+      c = c[d] || (c[d] = C()), d = b[++e], va(a, c, b, e, d);
     }
   }
 }
-function va(a, c, b, e, d, f, g, k) {
+function ua(a, c, b, e, d, f, g, k) {
   if (a = a[g]) {
     if (e === c.length - 1) {
       if (a.constructor === Array) {
@@ -554,15 +551,15 @@ function va(a, c, b, e, d, f, g, k) {
     } else {
       if (a.constructor === Array) {
         for (g = 0; g < a.length; g++) {
-          va(a, c, b, e, d, f, g, k);
+          ua(a, c, b, e, d, f, g, k);
         }
       } else {
-        g = c[++e], va(a, c, b, e, d, f, g, k);
+        g = c[++e], ua(a, c, b, e, d, f, g, k);
       }
     }
   }
 }
-;function xa(a, c, b, e, d) {
+;function wa(a, c, b, e, d) {
   const f = a.length;
   let g = [], k, h;
   k = C();
@@ -577,7 +574,7 @@ function va(a, c, b, e, d, f, g, k) {
   }
   if (a = g.length) {
     if (d) {
-      g = 1 < g.length ? ya(g, b, e) : (g = g[0]).length > b || e ? g.slice(e, b + e) : g;
+      g = 1 < g.length ? xa(g, b, e) : (g = g[0]).length > b || e ? g.slice(e, b + e) : g;
     } else {
       if (a < f) {
         return [];
@@ -592,7 +589,7 @@ function va(a, c, b, e, d, f, g, k) {
   }
   return g;
 }
-function ya(a, c, b) {
+function xa(a, c, b) {
   const e = [], d = C();
   let f;
   var g = a.length;
@@ -614,7 +611,7 @@ function ya(a, c, b) {
   }
   return e;
 }
-function za(a, c) {
+function ya(a, c) {
   const b = C(), e = [];
   for (let d = 0, f; d < c.length; d++) {
     f = c[d];
@@ -627,7 +624,7 @@ function za(a, c) {
   }
   return e;
 }
-;function Aa(a, c, b, e) {
+;function za(a, c, b, e) {
   if (!a.length) {
     return a;
   }
@@ -658,7 +655,7 @@ function za(a, c) {
   d = 1 < d.length ? [].concat.apply([], d) : d[0];
   return e ? W.call(this, d) : d;
 }
-;function Ba(a, c, b) {
+;function Aa(a, c, b) {
   var e = b[0];
   if (e.then) {
     return Promise.all(b).then(function(m) {
@@ -705,10 +702,10 @@ function za(a, c) {
   return {O:e, P:d, limit:f, offset:g, enrich:k, resolve:h, suggest:l};
 }
 ;X.prototype.or = function() {
-  const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f} = Ba(this, "or", arguments);
-  return Ca.call(this, a, c, b, e, d, f);
+  const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f} = Aa(this, "or", arguments);
+  return Ba.call(this, a, c, b, e, d, f);
 };
-function Ca(a, c, b, e, d, f) {
+function Ba(a, c, b, e, d, f) {
   if (c.length) {
     const g = this;
     return Promise.all(c).then(function(k) {
@@ -716,10 +713,10 @@ function Ca(a, c, b, e, d, f) {
       for (let h = 0, l; h < k.length; h++) {
         (l = k[h]).length && (a[h] = l);
       }
-      return Ca.call(g, a, [], b, e, d, f);
+      return Ba.call(g, a, [], b, e, d, f);
     });
   }
-  a.length && (this.result.length && a.push(this.result), 2 > a.length ? this.result = a[0] : (this.result = ya(a, b, e), e = 0));
+  a.length && (this.result.length && a.push(this.result), 2 > a.length ? this.result = a[0] : (this.result = xa(a, b, e), e = 0));
   return f ? this.resolve(b, e, d) : this;
 }
 ;X.prototype.and = function() {
@@ -729,11 +726,40 @@ function Ca(a, c, b, e, d, f) {
     f && (a = !!f.suggest, d = f.resolve, c = f.limit, b = f.offset, e = f.enrich && d);
   }
   if (a) {
-    const {O:f, P:g, limit:k, offset:h, enrich:l, resolve:m, suggest:n} = Ba(this, "and", arguments);
-    return Da.call(this, f, g, k, h, l, m, n);
+    const {O:f, P:g, limit:k, offset:h, enrich:l, resolve:m, suggest:n} = Aa(this, "and", arguments);
+    return Ca.call(this, f, g, k, h, l, m, n);
   }
   return d ? this.resolve(c, b, e) : this;
 };
+function Ca(a, c, b, e, d, f, g) {
+  if (c.length) {
+    const k = this;
+    return Promise.all(c).then(function(h) {
+      a = [];
+      for (let l = 0, m; l < h.length; l++) {
+        (m = h[l]).length && (a[l] = m);
+      }
+      return Ca.call(k, a, [], b, e, d, f, g);
+    });
+  }
+  if (a.length) {
+    if (this.result.length && a.unshift(this.result), 2 > a.length) {
+      this.result = a[0];
+    } else {
+      if (c = aa(a)) {
+        return this.result = wa(a, c, b, e, g), f ? d ? W.call(this.index, this.result) : this.result : this;
+      }
+      this.result = [];
+    }
+  } else {
+    g || (this.result = a);
+  }
+  return f ? this.resolve(b, e, d) : this;
+}
+;X.prototype.xor = function() {
+  const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f, suggest:g} = Aa(this, "xor", arguments);
+  return Da.call(this, a, c, b, e, d, f, g);
+};
 function Da(a, c, b, e, d, f, g) {
   if (c.length) {
     const k = this;
@@ -749,43 +775,14 @@ function Da(a, c, b, e, d, f, g) {
     if (this.result.length && a.unshift(this.result), 2 > a.length) {
       this.result = a[0];
     } else {
-      if (c = aa(a)) {
-        return this.result = xa(a, c, b, e, g), f ? d ? W.call(this.index, this.result) : this.result : this;
-      }
-      this.result = [];
+      return this.result = Ea.call(this, a, b, e, f, this.h), f ? d ? W.call(this.index, this.result) : this.result : this;
     }
   } else {
     g || (this.result = a);
   }
   return f ? this.resolve(b, e, d) : this;
 }
-;X.prototype.xor = function() {
-  const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f, suggest:g} = Ba(this, "xor", arguments);
-  return Ea.call(this, a, c, b, e, d, f, g);
-};
-function Ea(a, c, b, e, d, f, g) {
-  if (c.length) {
-    const k = this;
-    return Promise.all(c).then(function(h) {
-      a = [];
-      for (let l = 0, m; l < h.length; l++) {
-        (m = h[l]).length && (a[l] = m);
-      }
-      return Ea.call(k, a, [], b, e, d, f, g);
-    });
-  }
-  if (a.length) {
-    if (this.result.length && a.unshift(this.result), 2 > a.length) {
-      this.result = a[0];
-    } else {
-      return this.result = Fa.call(this, a, b, e, f, this.h), f ? d ? W.call(this.index, this.result) : this.result : this;
-    }
-  } else {
-    g || (this.result = a);
-  }
-  return f ? this.resolve(b, e, d) : this;
-}
-function Fa(a, c, b, e, d) {
+function Ea(a, c, b, e, d) {
   const f = [], g = C();
   let k = 0;
   for (let h = 0, l; h < a.length; h++) {
@@ -831,10 +828,10 @@ function Fa(a, c, b, e, d) {
   return f;
 }
 ;X.prototype.not = function() {
-  const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f, suggest:g} = Ba(this, "not", arguments);
-  return Ga.call(this, a, c, b, e, d, f, g);
+  const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f, suggest:g} = Aa(this, "not", arguments);
+  return Fa.call(this, a, c, b, e, d, f, g);
 };
-function Ga(a, c, b, e, d, f, g) {
+function Fa(a, c, b, e, d, f, g) {
   if (c.length) {
     const k = this;
     return Promise.all(c).then(function(h) {
@@ -842,17 +839,17 @@ function Ga(a, c, b, e, d, f, g) {
       for (let l = 0, m; l < h.length; l++) {
         (m = h[l]).length && (a[l] = m);
       }
-      return Ga.call(k, a, [], b, e, d, f, g);
+      return Fa.call(k, a, [], b, e, d, f, g);
     });
   }
   if (a.length && this.result.length) {
-    this.result = Ha.call(this, a, b, e, f);
+    this.result = Ga.call(this, a, b, e, f);
   } else if (f) {
     return this.resolve(b, e, d);
   }
   return f ? d ? W.call(this.index, this.result) : this.result : this;
 }
-function Ha(a, c, b, e) {
+function Ga(a, c, b, e) {
   const d = [];
   a = new Set(a.flat().flat());
   for (let f = 0, g, k = 0; f < this.result.length; f++) {
@@ -927,7 +924,7 @@ X.prototype.boost = function(a) {
 X.prototype.resolve = function(a, c, b) {
   const e = this.result, d = this.index;
   this.result = this.index = null;
-  return e.length ? ("object" === typeof a && (b = a.enrich, c = a.offset, a = a.limit), Aa.call(d, e, a || 100, c, b)) : e;
+  return e.length ? ("object" === typeof a && (b = a.enrich, c = a.offset, a = a.limit), za.call(d, e, a || 100, c, b)) : e;
 };
 C();
 V.prototype.search = function(a, c, b, e) {
@@ -988,7 +985,7 @@ V.prototype.search = function(a, c, b, e) {
         e = [];
         if (u.length) {
           for (f = 0; f < u.length; f += 2) {
-            y = Ia.call(this, u[f], u[f + 1], c, n, g), d.push({field:u[f], tag:u[f + 1], result:y});
+            y = Ha.call(this, u[f], u[f + 1], c, n, g), d.push({field:u[f], tag:u[f + 1], result:y});
           }
         }
         return e.length ? Promise.all(e).then(function(x) {
@@ -1022,7 +1019,7 @@ V.prototype.search = function(a, c, b, e) {
     if (m && F) {
       v = [];
       z = 0;
-      for (let G = 0, H, Wa; G < m.length; G += 2) {
+      for (let G = 0, H, Va; G < m.length; G += 2) {
         H = this.tag.get(m[G]);
         if (!H) {
           if (console.warn("Tag '" + m[G] + ":" + m[G + 1] + "' will be skipped because there is no field '" + m[G] + "'."), h) {
@@ -1031,14 +1028,14 @@ V.prototype.search = function(a, c, b, e) {
             return p ? d : new X(d);
           }
         }
-        if (Wa = (H = H && H.get(m[G + 1])) && H.length) {
+        if (Va = (H = H && H.get(m[G + 1])) && H.length) {
           z++, v.push(H);
         } else if (!h) {
           return p ? d : new X(d);
         }
       }
       if (z) {
-        r = za(r, v);
+        r = ya(r, v);
         F = r.length;
         if (!F && !h) {
           return p ? r : new X(r);
@@ -1073,9 +1070,9 @@ V.prototype.search = function(a, c, b, e) {
     }
     d[x] = {field:f[x], result:r};
   }
-  return k ? Ja(d, c) : q ? Ka(d, a, this.index, this.field, this.C, q) : d;
+  return k ? Ia(d, c) : q ? Ja(d, a, this.index, this.field, this.C, q) : d;
 };
-function Ka(a, c, b, e, d, f) {
+function Ja(a, c, b, e, d, f) {
   let g, k, h;
   for (let m = 0, n, t, p, q, y; m < a.length; m++) {
     n = a[m].result;
@@ -1117,7 +1114,7 @@ function Ka(a, c, b, e, d, f) {
   }
   return a;
 }
-function Ja(a, c) {
+function Ia(a, c) {
   const b = [], e = C();
   for (let d = 0, f, g; d < a.length; d++) {
     f = a[d];
@@ -1136,7 +1133,7 @@ function Ja(a, c) {
   }
   return b;
 }
-function Ia(a, c, b, e, d) {
+function Ha(a, c, b, e, d) {
   let f = this.tag.get(a);
   if (!f) {
     return console.warn("Tag '" + a + "' was not found"), [];
@@ -1168,23 +1165,24 @@ function W(a) {
   this.C = [];
   this.field = [];
   this.J = [];
-  this.key = (b = c.key || c.id) && La(b, this.J) || "id";
+  this.key = (b = c.key || c.id) && Ka(b, this.J) || "id";
   this.reg = (this.fastupdate = !!a.fastupdate) ? new Map() : new Set();
   this.A = (b = c.store || null) && b && !0 !== b && [];
   this.store = b && new Map();
   this.cache = (b = a.cache || null) && new Y(b);
   a.cache = !1;
+  this.priority = a.priority || 4;
   b = new Map();
   let e = c.index || c.field || c;
   D(e) && (e = [e]);
   for (let d = 0, f, g; d < e.length; d++) {
-    f = e[d], D(f) || (g = f, f = f.field), g = I(g) ? Object.assign({}, a, g) : a, b.set(f, new O(g, this.reg)), g.custom ? this.C[d] = g.custom : (this.C[d] = La(f, this.J), g.filter && ("string" === typeof this.C[d] && (this.C[d] = new String(this.C[d])), this.C[d].I = g.filter)), this.field[d] = f;
+    f = e[d], D(f) || (g = f, f = f.field), g = I(g) ? Object.assign({}, a, g) : a, b.set(f, new O(g, this.reg)), g.custom ? this.C[d] = g.custom : (this.C[d] = Ka(f, this.J), g.filter && ("string" === typeof this.C[d] && (this.C[d] = new String(this.C[d])), this.C[d].I = g.filter)), this.field[d] = f;
   }
   if (this.A) {
     a = c.store;
     D(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.U = g) : (this.A[d] = La(g, this.J), f.filter && ("string" === typeof this.A[d] && (this.A[d] = new String(this.A[d])), this.A[d].I = f.filter));
+      f = a[d], g = f.field || f, f.custom ? (this.A[d] = f.custom, f.custom.U = g) : (this.A[d] = Ka(g, this.J), f.filter && ("string" === typeof this.A[d] && (this.A[d] = new String(this.A[d])), this.A[d].I = f.filter));
     }
   }
   this.index = b;
@@ -1200,14 +1198,14 @@ function W(a) {
         if (!g) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
-        f.custom ? this.B[d] = f.custom : (this.B[d] = La(g, this.J), f.filter && ("string" === typeof this.B[d] && (this.B[d] = new String(this.B[d])), this.B[d].I = f.filter));
+        f.custom ? this.B[d] = f.custom : (this.B[d] = Ka(g, this.J), f.filter && ("string" === typeof this.B[d] && (this.B[d] = new String(this.B[d])), this.B[d].I = f.filter));
         this.T[d] = g;
         this.tag.set(g, new Map());
       }
     }
   }
 }
-function La(a, c) {
+function Ka(a, c) {
   const b = a.split(":");
   let e = 0;
   for (let d = 0; d < b.length; d++) {
@@ -1272,7 +1270,7 @@ w.set = function(a, c) {
   this.store.set(a, c);
   return this;
 };
-w.searchCache = Ma;
+w.searchCache = La;
 w.export = function(a, c, b = 0, e = 0) {
   if (b < this.field.length) {
     const g = this.field[b];
@@ -1293,22 +1291,18 @@ w.export = function(a, c, b = 0, e = 0) {
       break;
     case 1:
       d = "tag";
-      f = qa(this.tag, this.reg.size);
+      f = this.tag && qa(this.tag, this.reg.size);
       c = null;
       break;
     case 2:
       d = "doc";
-      f = oa(this.store);
+      f = this.store && oa(this.store);
       c = null;
       break;
-    case 3:
-      d = "cfg";
-      c = f = null;
-      break;
     default:
       return;
   }
-  return ua.call(this, a, c, d, f, b, e);
+  return U.call(this, a, c, d, f, b, e);
 };
 w.import = function(a, c) {
   var b = a.split(".");
@@ -1337,7 +1331,7 @@ w.import = function(a, c) {
   }
 };
 ja(V.prototype);
-function Ma(a, c, b) {
+function La(a, c, b) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
   this.cache || (this.cache = new Y());
   let e = this.cache.get(a);
@@ -1378,31 +1372,31 @@ Y.prototype.clear = function() {
   this.cache.clear();
   this.h = "";
 };
-const Na = {normalize:function(a) {
+const Ma = {normalize:function(a) {
   return a.toLowerCase();
 }};
-const Oa = 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 Pa = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), Qa = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
-const Ra = {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 Na = 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 Oa = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), Pa = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
+const Qa = {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 Ra = /[\x00-\x7F]+/g;
 const Sa = /[\x00-\x7F]+/g;
 const Ta = /[\x00-\x7F]+/g;
-const Ua = /[\x00-\x7F]+/g;
-var Va = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:Na, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:Oa}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:Oa, matcher:Pa, replacer:Qa}, LatinExtra:{normalize:!0, dedupe:!0, mapper:Oa, replacer:Qa.concat([/(?!^)[aeo]/g, ""]), matcher:Pa}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
+var Ua = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:Ma, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:Na}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:Na, matcher:Oa, replacer:Pa}, LatinExtra:{normalize:!0, dedupe:!0, mapper:Na, replacer:Pa.concat([/(?!^)[aeo]/g, ""]), matcher:Oa}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
   for (let b = 0; b < a.length; b++) {
     var c = a[b];
-    let e = c.charAt(0), d = Ra[e];
-    for (let f = 1, g; f < c.length && (g = c.charAt(f), "h" === g || "w" === g || !(g = Ra[g]) || g === d || (e += g, d = g, 4 !== e.length)); f++) {
+    let e = c.charAt(0), d = Qa[e];
+    for (let f = 1, g; f < c.length && (g = c.charAt(f), "h" === g || "w" === g || !(g = Qa[g]) || g === d || (e += g, d = g, 4 !== e.length)); f++) {
     }
     a[b] = e;
   }
 }}, ArabicDefault:{rtl:!0, normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(Sa, " ");
+  return ("" + a).replace(Ra, " ");
 }}, CjkDefault:{normalize:!1, dedupe:!0, split:"", prepare:function(a) {
-  return ("" + a).replace(Ta, "");
+  return ("" + a).replace(Sa, "");
 }}, CyrillicDefault:{normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(Ua, " ");
+  return ("" + a).replace(Ta, " ");
 }}};
-const 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}}};
+const Wa = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
 O.prototype.add = function(a, c, b, e) {
   if (c && (a || 0 === a)) {
     if (!e && !b && this.reg.has(a)) {
@@ -1415,14 +1409,14 @@ O.prototype.add = function(a, c, b, e) {
         let q = c[this.rtl ? e - 1 - p : p];
         var d = q.length;
         if (d && (n || !m[q])) {
-          var f = this.score ? this.score(c, q, p, null, 0) : Ya(t, e, p), g = "";
+          var f = this.score ? this.score(c, q, p, null, 0) : Xa(t, e, p), g = "";
           switch(this.tokenize) {
             case "full":
               if (2 < d) {
                 for (f = 0; f < d; f++) {
                   for (var k = d; k > f; k--) {
                     g = q.substring(f, k);
-                    var h = this.score ? this.score(c, q, p, g, f) : Ya(t, e, p, d, f);
+                    var h = this.score ? this.score(c, q, p, g, f) : Xa(t, e, p, d, f);
                     Z(this, m, g, h, a, b);
                   }
                 }
@@ -1431,7 +1425,7 @@ O.prototype.add = function(a, c, b, e) {
             case "reverse":
               if (1 < d) {
                 for (k = d - 1; 0 < k; k--) {
-                  g = q[k] + g, h = this.score ? this.score(c, q, p, g, k) : Ya(t, e, p, d, k), Z(this, m, g, h, a, b);
+                  g = q[k] + g, h = this.score ? this.score(c, q, p, g, k) : Xa(t, e, p, d, k), Z(this, m, g, h, a, b);
                 }
                 g = "";
               }
@@ -1447,7 +1441,7 @@ O.prototype.add = function(a, c, b, e) {
                 for (d = C(), g = this.S, f = q, k = Math.min(n + 1, e - p), d[f] = 1, h = 1; h < k; h++) {
                   if ((q = c[this.rtl ? e - 1 - p - h : p + h]) && !d[q]) {
                     d[q] = 1;
-                    const y = this.score ? this.score(c, f, p, q, h) : Ya(g + (e / 2 > g ? 0 : 1), e, p, k - 1, h - 1), u = this.bidirectional && q > f;
+                    const y = this.score ? this.score(c, f, p, q, h) : Xa(g + (e / 2 > g ? 0 : 1), e, p, k - 1, h - 1), u = this.bidirectional && q > f;
                     Z(this, l, u ? f : q, y, a, b, u ? q : f);
                   }
                 }
@@ -1466,7 +1460,7 @@ function Z(a, c, b, e, d, f, g) {
     g ? (c = h || (c[b] = C()), c[g] = 1, (h = k.get(g)) ? k = h : k.set(g, k = new Map())) : c[b] = 1, (h = k.get(b)) ? k = h : k.set(b, k = []), k = k[e] || (k[e] = []), f && k.includes(d) || (k.push(d), a.fastupdate && ((c = a.reg.get(d)) ? c.push(k) : a.reg.set(d, [k])));
   }
 }
-function Ya(a, c, b, e, d) {
+function Xa(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;
 }
 ;O.prototype.search = function(a, c, b) {
@@ -1487,11 +1481,11 @@ function Ya(a, c, b, e, d) {
   b = a.length;
   c = c || (k ? 100 : 0);
   if (1 === b) {
-    return g = c, (c = Za(this, a[0], "")) && c.length ? Aa.call(this, c, g, d) : [];
+    return g = c, (c = Ya(this, a[0], "")) && c.length ? za.call(this, c, g, d) : [];
   }
   f = this.depth && !1 !== f;
   if (2 === b && f && !g) {
-    return g = c, (c = Za(this, a[0], a[1])) && c.length ? Aa.call(this, c, g, d) : [];
+    return g = c, (c = Ya(this, a[0], a[1])) && c.length ? za.call(this, c, g, d) : [];
   }
   k = C();
   let l = 0;
@@ -1503,7 +1497,7 @@ function Ya(a, c, b, e, d) {
   for (let q, y; l < b; l++) {
     if ((y = a[l]) && !k[y]) {
       k[y] = 1;
-      q = Za(this, y, m);
+      q = Ya(this, y, m);
       a: {
         f = q;
         var n = e, t = g, p = h;
@@ -1540,16 +1534,16 @@ function Ya(a, c, b, e, d) {
     e = a.length;
     m = a;
     if (1 < e) {
-      m = xa(a, h, c, d, g);
+      m = wa(a, h, c, d, g);
     } else if (1 === e) {
-      g = Aa.call(null, a[0], c, d);
+      g = za.call(null, a[0], c, d);
       break a;
     }
     g = m;
   }
   return g;
 };
-function Za(a, c, b) {
+function Ya(a, c, b) {
   let e;
   b && (e = a.bidirectional && c > b) && (e = b, b = c, c = e);
   a = b ? (a = a.ctx.get(b)) && a.get(c) : a.map.get(c);
@@ -1570,14 +1564,14 @@ function Za(a, c, b) {
         }
       }
     } else {
-      $a(this.map, a), this.depth && $a(this.ctx, a);
+      Za(this.map, a), this.depth && Za(this.ctx, a);
     }
     c || this.reg.delete(a);
   }
   this.cache && this.cache.remove(a);
   return this;
 };
-function $a(a, c) {
+function Za(a, c) {
   let b = 0;
   if (a.constructor === Array) {
     for (let e = 0, d, f; e < a.length; e++) {
@@ -1592,7 +1586,7 @@ function $a(a, c) {
     }
   } else {
     for (let e of a.entries()) {
-      const d = e[0], f = $a(e[1], c);
+      const d = e[0], f = Za(e[1], c);
       f ? b += f : a.delete(d);
     }
   }
@@ -1604,12 +1598,12 @@ function $a(a, c) {
   }
   if (a) {
     var b = D(a) ? a : a.preset;
-    b && (Xa[b] || console.warn("Preset not found: " + b), a = Object.assign({}, Xa[b], a));
+    b && (Wa[b] || console.warn("Preset not found: " + b), a = Object.assign({}, Wa[b], a));
   } else {
     a = {};
   }
   b = a.context;
-  const e = !0 === b ? {depth:1} : b || {}, d = D(a.encoder) ? Va[a.encoder] : a.encode || a.encoder || Na;
+  const e = !0 === b ? {depth:1} : b || {}, d = D(a.encoder) ? Ua[a.encoder] : a.encode || a.encoder || Ma;
   this.encoder = d.encode ? d : "object" === typeof d ? new K(d) : {encode:d};
   this.resolution = a.resolution || 9;
   this.tokenize = (b = a.tokenize) && "default" !== b && b || "strict";
@@ -1644,7 +1638,7 @@ w.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 ab(a) {
+function $a(a) {
   let c = 0;
   if (a.constructor === Array) {
     for (let b = 0, e; b < a.length; b++) {
@@ -1652,7 +1646,7 @@ function ab(a) {
     }
   } else {
     for (const b of a) {
-      const e = b[0], d = ab(b[1]);
+      const e = b[0], d = $a(b[1]);
       d ? c += d : a.delete(e);
     }
   }
@@ -1662,11 +1656,11 @@ w.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
-  ab(this.map);
-  this.depth && ab(this.ctx);
+  $a(this.map);
+  this.depth && $a(this.ctx);
   return this;
 };
-w.searchCache = Ma;
+w.searchCache = La;
 w.export = function(a, c, b = 0, e = 0) {
   let d, f;
   switch(e) {
@@ -1689,7 +1683,7 @@ w.export = function(a, c, b = 0, e = 0) {
     default:
       return;
   }
-  return ua.call(this, a, c, d, f, b, e);
+  return U.call(this, a, c, d, f, b, e);
 };
 w.import = function(a, c) {
   if (c) {
@@ -1757,6 +1751,6 @@ w.serialize = function(a = !0) {
   return a ? "function inject(index){" + c + e + d + "}" : c + e + d;
 };
 ja(O.prototype);
-export default {Index:O, Charset:Va, Encoder:K, Document:V, Worker:null, Resolver:null, IndexedDB:null, Language:{}};
+export default {Index:O, Charset:Ua, Encoder:K, Document:V, Worker:null, Resolver:null, IndexedDB:null, Language:{}};
 
-export const Index=O;export const  Charset=Va;export const  Encoder=K;export const  Document=V;export const  Worker=null;export const  Resolver=null;export const  IndexedDB=null;export const  Language={};
\ No newline at end of file
+export const Index=O;export const  Charset=Ua;export const  Encoder=K;export const  Document=V;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 6d188cb..c881e0f 100644
--- a/dist/flexsearch.compact.module.min.js
+++ b/dist/flexsearch.compact.module.min.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.115 (Bundle)
+ * FlexSearch.js v0.8.117 (Bundle)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -21,50 +21,50 @@ v.addMatcher=function(a,c){if("object"===typeof a)return this.addReplacer(a,c);i
 v.encode=function(a){if(this.cache&&a.length<=this.K)if(this.H){if(this.F.has(a))return this.F.get(a)}else this.H=setTimeout(L,50,this);this.normalize&&("function"===typeof this.normalize?a=this.normalize(a):a=ha?a.normalize("NFKD").replace(ha,"").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,"$1 "));const c=!(this.dedupe||this.mapper||this.filter||this.matcher||this.stemmer||this.replacer);let b=
 [],e=this.split||""===this.split?a.split(this.split):a;for(let f=0,g,k;f<e.length;f++)if((g=k=e[f])&&!(g.length<this.minlength))if(c)b.push(g);else if(!this.filter||!this.filter.has(g)){if(this.cache&&g.length<=this.L)if(this.H){var d=this.G.get(g);if(d||""===d){d&&b.push(d);continue}}else this.H=setTimeout(L,50,this);this.stemmer&&2<g.length&&(this.N||(this.N=new RegExp("(?!^)("+this.D+")$")),g=g.replace(this.N,h=>this.stemmer.get(h)),g.length<this.minlength||this.filter&&this.filter.has(g))&&(g=
 "");if(g&&(this.mapper||this.dedupe&&1<g.length)){d="";for(let h=0,l="",m,n;h<g.length;h++)m=g.charAt(h),m===l&&this.dedupe||((n=this.mapper&&this.mapper.get(m))||""===n?n===l&&this.dedupe||!(l=n)||(d+=n):d+=l=m);g=d}this.matcher&&1<g.length&&(this.M||(this.M=new RegExp("("+this.h+")","g")),g=g.replace(this.M,h=>this.matcher.get(h)));if(g&&this.replacer)for(d=0;g&&d<this.replacer.length;d+=2)g=g.replace(this.replacer[d],this.replacer[d+1]);this.cache&&k.length<=this.L&&(this.G.set(k,g),this.G.size>
-this.R&&(this.G.clear(),this.L=this.L/1.1|0));g&&b.push(g)}this.finalize&&(b=this.finalize(b)||b);this.cache&&a.length<=this.K&&(this.F.set(a,b),this.F.size>this.R&&(this.F.clear(),this.K=this.K/1.1|0));return b};function L(a){a.H=null;a.F.clear();a.G.clear()};let M,N;async function ia(a){a=a.data;var c=a.task;const b=a.id;let e=a.args;switch(c){case "init":N=a.options||{};(c=a.factory)?(Function("return "+c)()(self),M=new self.FlexSearch.Index(N),delete self.FlexSearch):M=new O(N);postMessage({id:b});break;default:let d;"export"===c&&(e[1]?(e[0]=N.export,e[2]=0,e[3]=1):e=null);"import"===c?e[0]&&(a=await N.import.call(M,e[0]),M.import(e[0],a)):(d=e&&M[c].apply(M,e))&&d.then&&(d=await d);postMessage("search"===c?{id:b,msg:d}:{id:b})}};function ja(a){P.call(a,"add");P.call(a,"append");P.call(a,"search");P.call(a,"update");P.call(a,"remove")}let Q,ka;const R={},S={};function la(a){Q=0;R[a]=S[a]}
-function P(a){this[a+"Async"]=function(){const c=arguments;var b=c[c.length-1];let e;"function"===typeof b&&(e=b,delete c[c.length-1]);Q||(Q=setTimeout(la,0,a),ka=Date.now());S[a]||(S[a]=R[a]=1E3);if(!--R[a]){R[a]=S[a]=S[a]*this.priority*this.priority*3/(Date.now()-ka)|0||1;Q=clearTimeout(Q);const f=this;return new Promise(g=>{setTimeout(function(){g(f[a+"Async"].apply(f,c))},0)})}const d=this[a].apply(this,c);b=d.then?d:new Promise(f=>f(d));e&&b.then(e);return b}};let T=0;
-function ma(a={}){function c(g){function k(h){h=h.data||h;const l=h.id,m=l&&d.h[l];m&&(m(h.msg),delete d.h[l])}this.worker=g;this.h=C();if(this.worker){e?this.worker.on("message",k):this.worker.onmessage=k;if(a.config)return new Promise(function(h){d.h[++T]=function(){h(d)};d.worker.postMessage({id:T,task:"init",factory:b,options:a})});this.worker.postMessage({task:"init",factory:b,options:a});return this}}if(!this||this.constructor!==ma)return new ma(a);let b="undefined"!==typeof self?self._factory:"undefined"!==
-typeof window?window._factory:null;b&&(b=b.toString());const e="undefined"===typeof window,d=this,f=na(b,e,a.worker);return f.then?f.then(function(g){return c.call(d,g)}):c.call(this,f)}U("add");U("append");U("search");U("update");U("remove");U("clear");U("export");U("import");ja(ma.prototype);
-function U(a){ma.prototype[a]=function(){const c=this,b=[].slice.call(arguments);var e=b[b.length-1];let d;"function"===typeof e&&(d=e,b.pop());e=new Promise(function(f){"export"===a&&"function"===typeof b[0]&&(b[0]=null);c.h[++T]=f;c.worker.postMessage({task:a,id:T,args:b})});return d?(e.then(d),this):e}}
+this.R&&(this.G.clear(),this.L=this.L/1.1|0));g&&b.push(g)}this.finalize&&(b=this.finalize(b)||b);this.cache&&a.length<=this.K&&(this.F.set(a,b),this.F.size>this.R&&(this.F.clear(),this.K=this.K/1.1|0));return b};function L(a){a.H=null;a.F.clear();a.G.clear()};let M,N;async function ia(a){a=a.data;var c=a.task;const b=a.id;let e=a.args;switch(c){case "init":N=a.options||{};(c=a.factory)?(Function("return "+c)()(self),M=new self.FlexSearch.Index(N),delete self.FlexSearch):M=new O(N);postMessage({id:b});break;default:let d;"export"===c&&(e[1]?(e[0]=N.export,e[2]=0,e[3]=1):e=null);"import"===c?e[0]&&(a=await N.import.call(M,e[0]),M.import(e[0],a)):(d=e&&M[c].apply(M,e))&&d.then&&(d=await d);postMessage("search"===c?{id:b,msg:d}:{id:b})}};function ja(a){P.call(a,"add");P.call(a,"append");P.call(a,"search");P.call(a,"update");P.call(a,"remove")}let ka,la,Q;function ma(){ka=Q=0}
+function P(a){this[a+"Async"]=function(){const c=arguments;var b=c[c.length-1];let e;"function"===typeof b&&(e=b,delete c[c.length-1]);ka?Q||(Q=Date.now()-la>=this.priority*this.priority*3):(ka=setTimeout(ma,0),la=Date.now());if(Q){const f=this;return new Promise(g=>{setTimeout(function(){g(f[a+"Async"].apply(f,c))},0)})}const d=this[a].apply(this,c);b=d.then?d:new Promise(f=>f(d));e&&b.then(e);return b}};let R=0;
+function S(a={}){function c(g){function k(h){h=h.data||h;const l=h.id,m=l&&d.h[l];m&&(m(h.msg),delete d.h[l])}this.worker=g;this.h=C();if(this.worker){e?this.worker.on("message",k):this.worker.onmessage=k;if(a.config)return new Promise(function(h){d.h[++R]=function(){h(d);1E9<R&&(R=0)};d.worker.postMessage({id:R,task:"init",factory:b,options:a})});this.worker.postMessage({task:"init",factory:b,options:a});this.priority=a.priority||4;return this}}if(!this||this.constructor!==S)return new S(a);let b=
+"undefined"!==typeof self?self._factory:"undefined"!==typeof window?window._factory:null;b&&(b=b.toString());const e="undefined"===typeof window,d=this,f=na(b,e,a.worker);return f.then?f.then(function(g){return c.call(d,g)}):c.call(this,f)}T("add");T("append");T("search");T("update");T("remove");T("clear");T("export");T("import");ja(S.prototype);
+function T(a){S.prototype[a]=function(){const c=this,b=[].slice.call(arguments);var e=b[b.length-1];let d;"function"===typeof e&&(d=e,b.pop());e=new Promise(function(f){"export"===a&&"function"===typeof b[0]&&(b[0]=null);c.h[++R]=f;c.worker.postMessage({task:a,id:R,args:b})});return d?(e.then(d),this):e}}
 function na(a,c,b){return c?"undefined"!==typeof module?new (require("worker_threads")["Worker"])(__dirname + "/node/node.js"):import("worker_threads").then(function(worker){ return new worker["Worker"](import.meta.dirname + "/node/node.mjs"); }):a?new window.Worker(URL.createObjectURL(new Blob(["onmessage="+ia.toString()],{type:"text/javascript"}))):new window.Worker("string"===typeof b?b:import.meta.url.replace("/worker.js","/worker/worker.js").replace("flexsearch.bundle.module.min.js",
 "module/worker/worker.js"),{type:"module"})};function oa(a,c=0){let b=[],e=[];c&&(c=25E4/c*5E3|0);for(const d of a.entries())e.push(d),e.length===c&&(b.push(e),e=[]);e.length&&b.push(e);return b}function pa(a,c){c||(c=new Map);for(let b=0,e;b<a.length;b++)e=a[b],c.set(e[0],e[1]);return c}function qa(a,c=0){let b=[],e=[];c&&(c=25E4/c*1E3|0);for(const d of a.entries())e.push([d[0],oa(d[1])[0]]),e.length===c&&(b.push(e),e=[]);e.length&&b.push(e);return b}
 function ra(a,c){c||(c=new Map);for(let b=0,e,d;b<a.length;b++)e=a[b],d=c.get(e[0]),c.set(e[0],pa(e[1],d));return c}function sa(a){let c=[],b=[];for(const e of a.keys())b.push(e),25E4===b.length&&(c.push(b),b=[]);b.length&&c.push(b);return c}function ta(a,c){c||(c=new Set);for(let b=0;b<a.length;b++)c.add(a[b]);return c}
-function ua(a,c,b,e,d,f,g=0){const k=e&&e.constructor===Array;var h=k?e.shift():e;if(!h)return this.export(a,c,d,f+1);if((h=a((c?c+".":"")+(g+1)+"."+b,JSON.stringify(h)))&&h.then){const l=this;return h.then(function(){return ua.call(l,a,c,b,k?e:null,d,f,g+1)})}return ua.call(this,a,c,b,k?e:null,d,f,g+1)};V.prototype.add=function(a,c,b){H(a)&&(c=a,a=I(c,this.key));if(c&&(a||0===a)){if(!b&&this.reg.has(a))return this.update(a,c);for(let k=0,h;k<this.field.length;k++){h=this.C[k];var e=this.index.get(this.field[k]);if("function"===typeof h){var d=h(c);d&&e.add(a,d,!1,!0)}else if(d=h.I,!d||d(c))h.constructor===String?h=[""+h]:D(h)&&(h=[h]),va(c,h,this.J,0,e,a,h[0],b)}if(this.tag)for(e=0;e<this.B.length;e++){var f=this.B[e];d=this.tag.get(this.T[e]);let k=C();if("function"===typeof f){if(f=f(c),!f)continue}else{var g=
+function U(a,c,b,e,d,f,g=0){const k=e&&e.constructor===Array;var h=k?e.shift():e;if(!h)return this.export(a,c,d,f+1);if((h=a((c?c+".":"")+(g+1)+"."+b,JSON.stringify(h)))&&h.then){const l=this;return h.then(function(){return U.call(l,a,c,b,k?e:null,d,f,g+1)})}return U.call(this,a,c,b,k?e:null,d,f,g+1)};V.prototype.add=function(a,c,b){H(a)&&(c=a,a=I(c,this.key));if(c&&(a||0===a)){if(!b&&this.reg.has(a))return this.update(a,c);for(let k=0,h;k<this.field.length;k++){h=this.C[k];var e=this.index.get(this.field[k]);if("function"===typeof h){var d=h(c);d&&e.add(a,d,!1,!0)}else if(d=h.I,!d||d(c))h.constructor===String?h=[""+h]:D(h)&&(h=[h]),ua(c,h,this.J,0,e,a,h[0],b)}if(this.tag)for(e=0;e<this.B.length;e++){var f=this.B[e];d=this.tag.get(this.T[e]);let k=C();if("function"===typeof f){if(f=f(c),!f)continue}else{var g=
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-for(let q,y;l<b;l++){if((y=a[l])&&!k[y]){k[y]=1;q=Za(this,y,m);a:{f=q;var n=e,t=g,p=h;let w=[];if(f&&f.length){if(f.length<=p){n.push(f);q=void 0;break a}for(let u=0,z;u<p;u++)if(z=f[u])w[u]=z;if(w.length){n.push(w);q=void 0;break a}}q=t?void 0:w}if(q){e=q;break}m&&(g&&q&&e.length||(m=y))}g&&m&&l===b-1&&!e.length&&(m="",l=-1,k=C())}a:{a=e;e=a.length;m=a;if(1<e)m=xa(a,h,c,d,g);else if(1===e){g=Aa.call(null,a[0],c,d);break a}g=m}return g};
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-function $a(a,c){let b=0;if(a.constructor===Array)for(let e=0,d,f;e<a.length;e++){if((d=a[e])&&d.length)if(f=d.indexOf(c),0<=f){1<d.length?(d.splice(f,1),b++):delete a[e];break}else b++}else for(let e of a.entries()){const d=e[0],f=$a(e[1],c);f?b+=f:a.delete(d)}return b};function O(a,c){if(!this||this.constructor!==O)return new O(a);if(a){var b=D(a)?a:a.preset;b&&(a=Object.assign({},Xa[b],a))}else a={};b=a.context;const e=!0===b?{depth:1}:b||{},d=D(a.encoder)?Wa[a.encoder]:a.encode||a.encoder||Na;this.encoder=d.encode?d:"object"===typeof d?new K(d):{encode:d};this.resolution=a.resolution||9;this.tokenize=(b=a.tokenize)&&"default"!==b&&b||"strict";this.depth="strict"===b&&e.depth||0;this.bidirectional=!1!==e.bidirectional;this.fastupdate=!!a.fastupdate;this.score=
+v.clear=function(){for(const a of this.index.values())a.clear();if(this.tag)for(const a of this.tag.values())a.clear();this.store&&this.store.clear();return this};v.contain=function(a){return this.reg.has(a)};v.cleanup=function(){for(const a of this.index.values())a.cleanup();return this};v.get=function(a){return this.store.get(a)};v.set=function(a,c){this.store.set(a,c);return this};v.searchCache=La;
+v.export=function(a,c,b=0,e=0){if(b<this.field.length){const g=this.field[b];if((c=this.index.get(g).export(a,g,b,e=1))&&c.then){const k=this;return c.then(function(){return k.export(a,g,b+1)})}return this.export(a,g,b+1)}let d,f;switch(e){case 0:d="reg";f=sa(this.reg);c=null;break;case 1:d="tag";f=this.tag&&qa(this.tag,this.reg.size);c=null;break;case 2:d="doc";f=this.store&&oa(this.store);c=null;break;default:return}return U.call(this,a,c,d,f,b,e)};
+v.import=function(a,c){var b=a.split(".");"json"===b[b.length-1]&&b.pop();a=2<b.length?b[0]:"";b=2<b.length?b[2]:b[1];if(c){"string"===typeof c&&(c=JSON.parse(c));if(a)return this.index.get(a).import(b,c);switch(b){case "reg":this.fastupdate=!1;this.reg=ta(c,this.reg);for(let e=0,d;e<this.field.length;e++)d=this.index.get(this.field[e]),d.fastupdate=!1,d.reg=this.reg;break;case "tag":this.tag=ra(c,this.tag);break;case "doc":this.store=pa(c,this.store)}}};ja(V.prototype);function La(a,c,b){a=("object"===typeof a?""+a.query:a).toLowerCase();this.cache||(this.cache=new Y);let e=this.cache.get(a);if(!e){e=this.search(a,c,b);if(e.then){const d=this;e.then(function(f){d.cache.set(a,f);return f})}this.cache.set(a,e)}return e}function Y(a){this.limit=a&&!0!==a?a:1E3;this.cache=new Map;this.h=""}Y.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)};
+Y.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};Y.prototype.remove=function(a){for(const c of this.cache){const b=c[0];c[1].includes(a)&&this.cache.delete(b)}};Y.prototype.clear=function(){this.cache.clear();this.h=""};const Ma={normalize:function(a){return a.toLowerCase()}};const Na=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 Oa=new Map([["ae","a"],["oe","o"],["sh","s"],["kh","k"],["th","t"],["pf","f"]]),Pa=[/([^aeo])h(.)/g,"$1$2",/([aeo])h([^aeo]|$)/g,"$1$2",/([^0-9])\1+/g,"$1"];const Qa={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 Ra=/[\x00-\x7F]+/g;const Sa=/[\x00-\x7F]+/g;const Ta=/[\x00-\x7F]+/g;var Va={LatinExact:{normalize:!1,dedupe:!1},LatinDefault:Ma,LatinSimple:{normalize:!0,dedupe:!0},LatinBalance:{normalize:!0,dedupe:!0,mapper:Na},LatinAdvanced:{normalize:!0,dedupe:!0,mapper:Na,matcher:Oa,replacer:Pa},LatinExtra:{normalize:!0,dedupe:!0,mapper:Na,replacer:Pa.concat([/(?!^)[aeo]/g,""]),matcher:Oa},LatinSoundex:{normalize:!0,dedupe:!1,include:{letter:!0},finalize:function(a){for(let b=0;b<a.length;b++){var c=a[b];let e=c.charAt(0),d=Qa[e];for(let f=1,g;f<c.length&&(g=c.charAt(f),"h"===
+g||"w"===g||!(g=Qa[g])||g===d||(e+=g,d=g,4!==e.length));f++);a[b]=e}}},ArabicDefault:{rtl:!0,normalize:!1,dedupe:!0,prepare:function(a){return(""+a).replace(Ra," ")}},CjkDefault:{normalize:!1,dedupe:!0,split:"",prepare:function(a){return(""+a).replace(Sa,"")}},CyrillicDefault:{normalize:!1,dedupe:!0,prepare:function(a){return(""+a).replace(Ta," ")}}};const Wa={memory:{resolution:1},performance:{resolution:6,fastupdate:!0,context:{depth:1,resolution:3}},match:{tokenize:"forward"},score:{resolution:9,context:{depth:2,resolution:9}}};O.prototype.add=function(a,c,b,e){if(c&&(a||0===a)){if(!e&&!b&&this.reg.has(a))return this.update(a,c);c=this.encoder.encode(c);if(e=c.length){const l=C(),m=C(),n=this.depth,t=this.resolution;for(let p=0;p<e;p++){let q=c[this.rtl?e-1-p:p];var d=q.length;if(d&&(n||!m[q])){var f=this.score?this.score(c,q,p,null,0):Xa(t,e,p),g="";switch(this.tokenize){case "full":if(2<d){for(f=0;f<d;f++)for(var k=d;k>f;k--){g=q.substring(f,k);var h=this.score?this.score(c,q,p,g,f):Xa(t,e,p,d,f);Z(this,m,g,h,a,b)}break}case "reverse":if(1<
+d){for(k=d-1;0<k;k--)g=q[k]+g,h=this.score?this.score(c,q,p,g,k):Xa(t,e,p,d,k),Z(this,m,g,h,a,b);g=""}case "forward":if(1<d){for(k=0;k<d;k++)g+=q[k],Z(this,m,g,f,a,b);break}default:if(Z(this,m,q,f,a,b),n&&1<e&&p<e-1)for(d=C(),g=this.S,f=q,k=Math.min(n+1,e-p),d[f]=1,h=1;h<k;h++)if((q=c[this.rtl?e-1-p-h:p+h])&&!d[q]){d[q]=1;const y=this.score?this.score(c,f,p,q,h):Xa(g+(e/2>g?0:1),e,p,k-1,h-1),w=this.bidirectional&&q>f;Z(this,l,w?f:q,y,a,b,w?q:f)}}}}this.fastupdate||this.reg.add(a)}}return this};
+function Z(a,c,b,e,d,f,g){let k=g?a.ctx:a.map,h;if(!c[b]||g&&!(h=c[b])[g])g?(c=h||(c[b]=C()),c[g]=1,(h=k.get(g))?k=h:k.set(g,k=new Map)):c[b]=1,(h=k.get(b))?k=h:k.set(b,k=[]),k=k[e]||(k[e]=[]),f&&k.includes(d)||(k.push(d),a.fastupdate&&((c=a.reg.get(d))?c.push(k):a.reg.set(d,[k])))}function Xa(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};O.prototype.search=function(a,c,b){b||(!c&&H(a)?(b=a,a=""):H(c)&&(b=c,c=0));var e=[],d=0;if(b){a=b.query||a;c=b.limit||c;d=b.offset||0;var f=b.context;var g=b.suggest;var k=!0;var h=b.resolution}else k=!0;a=this.encoder.encode(a);b=a.length;c=c||(k?100:0);if(1===b)return g=c,(c=Ya(this,a[0],""))&&c.length?za.call(this,c,g,d):[];f=this.depth&&!1!==f;if(2===b&&f&&!g)return g=c,(c=Ya(this,a[0],a[1]))&&c.length?za.call(this,c,g,d):[];k=C();let l=0;if(1<b&&f){var m=a[0];l=1}h||0===h||(h=m?this.S:this.resolution);
+for(let q,y;l<b;l++){if((y=a[l])&&!k[y]){k[y]=1;q=Ya(this,y,m);a:{f=q;var n=e,t=g,p=h;let w=[];if(f&&f.length){if(f.length<=p){n.push(f);q=void 0;break a}for(let u=0,z;u<p;u++)if(z=f[u])w[u]=z;if(w.length){n.push(w);q=void 0;break a}}q=t?void 0:w}if(q){e=q;break}m&&(g&&q&&e.length||(m=y))}g&&m&&l===b-1&&!e.length&&(m="",l=-1,k=C())}a:{a=e;e=a.length;m=a;if(1<e)m=wa(a,h,c,d,g);else if(1===e){g=za.call(null,a[0],c,d);break a}g=m}return g};
+function Ya(a,c,b){let e;b&&(e=a.bidirectional&&c>b)&&(e=b,b=c,c=e);a=b?(a=a.ctx.get(b))&&a.get(c):a.map.get(c);return a};O.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 e=0,d;e<b.length;e++){if(d=b[e])if(2>d.length)d.pop();else{const f=d.indexOf(a);f===b.length-1?d.pop():d.splice(f,1)}}else Za(this.map,a),this.depth&&Za(this.ctx,a);c||this.reg.delete(a)}this.cache&&this.cache.remove(a);return this};
+function Za(a,c){let b=0;if(a.constructor===Array)for(let e=0,d,f;e<a.length;e++){if((d=a[e])&&d.length)if(f=d.indexOf(c),0<=f){1<d.length?(d.splice(f,1),b++):delete a[e];break}else b++}else for(let e of a.entries()){const d=e[0],f=Za(e[1],c);f?b+=f:a.delete(d)}return b};function O(a,c){if(!this||this.constructor!==O)return new O(a);if(a){var b=D(a)?a:a.preset;b&&(a=Object.assign({},Wa[b],a))}else a={};b=a.context;const e=!0===b?{depth:1}:b||{},d=D(a.encoder)?Va[a.encoder]:a.encode||a.encoder||Ma;this.encoder=d.encode?d:"object"===typeof d?new K(d):{encode:d};this.resolution=a.resolution||9;this.tokenize=(b=a.tokenize)&&"default"!==b&&b||"strict";this.depth="strict"===b&&e.depth||0;this.bidirectional=!1!==e.bidirectional;this.fastupdate=!!a.fastupdate;this.score=
 a.score||null;b=!1;this.map=new Map;this.ctx=new Map;this.reg=c||(this.fastupdate?new Map:new Set);this.S=e.resolution||3;this.rtl=d.rtl||a.rtl||!1;this.cache=(b=a.cache||null)&&new Y(b);this.priority=a.priority||4}v=O.prototype;v.clear=function(){this.map.clear();this.ctx.clear();this.reg.clear();this.cache&&this.cache.clear();return this};v.append=function(a,c){return this.add(a,c,!0)};v.contain=function(a){return this.reg.has(a)};
-v.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 ab(a){let c=0;if(a.constructor===Array)for(let b=0,e;b<a.length;b++)(e=a[b])&&(c+=e.length);else for(const b of a){const e=b[0],d=ab(b[1]);d?c+=d:a.delete(e)}return c}v.cleanup=function(){if(!this.fastupdate)return this;ab(this.map);this.depth&&ab(this.ctx);return this};v.searchCache=Ma;
-v.export=function(a,c,b=0,e=0){let d,f;switch(e){case 0:d="reg";f=sa(this.reg);break;case 1:d="cfg";f=null;break;case 2:d="map";f=oa(this.map,this.reg.size);break;case 3:d="ctx";f=qa(this.ctx,this.reg.size);break;default:return}return ua.call(this,a,c,d,f,b,e)};
+v.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 $a(a){let c=0;if(a.constructor===Array)for(let b=0,e;b<a.length;b++)(e=a[b])&&(c+=e.length);else for(const b of a){const e=b[0],d=$a(b[1]);d?c+=d:a.delete(e)}return c}v.cleanup=function(){if(!this.fastupdate)return this;$a(this.map);this.depth&&$a(this.ctx);return this};v.searchCache=La;
+v.export=function(a,c,b=0,e=0){let d,f;switch(e){case 0:d="reg";f=sa(this.reg);break;case 1:d="cfg";f=null;break;case 2:d="map";f=oa(this.map,this.reg.size);break;case 3:d="ctx";f=qa(this.ctx,this.reg.size);break;default:return}return U.call(this,a,c,d,f,b,e)};
 v.import=function(a,c){if(c)switch("string"===typeof c&&(c=JSON.parse(c)),a=a.split("."),"json"===a[a.length-1]&&a.pop(),3===a.length&&a.shift(),a=1<a.length?a[1]:a[0],a){case "reg":this.fastupdate=!1;this.reg=ta(c,this.reg);break;case "map":this.map=pa(c,this.map);break;case "ctx":this.ctx=ra(c,this.ctx)}};
 v.serialize=function(a=!0){if(!this.reg.size)return"";let c="",b="";for(var e of this.reg.keys())b||(b=typeof e),c+=(c?",":"")+("string"===b?'"'+e+'"':e);c="index.reg=new Set(["+c+"]);";e="";for(var d of this.map.entries()){var f=d[0],g=d[1],k="";for(let m=0,n;m<g.length;m++){n=g[m]||[""];var h="";for(var l=0;l<n.length;l++)h+=(h?",":"")+("string"===b?'"'+n[l]+'"':n[l]);h="["+h+"]";k+=(k?",":"")+h}k='["'+f+'",['+k+"]]";e+=(e?",":"")+k}e="index.map=new Map(["+e+"]);";d="";for(const m of this.ctx.entries()){f=
-m[0];g=m[1];for(const n of g.entries()){g=n[0];k=n[1];h="";for(let t=0,p;t<k.length;t++){p=k[t]||[""];l="";for(let q=0;q<p.length;q++)l+=(l?",":"")+("string"===b?'"'+p[q]+'"':p[q]);l="["+l+"]";h+=(h?",":"")+l}h='new Map([["'+g+'",['+h+"]]])";h='["'+f+'",'+h+"]";d+=(d?",":"")+h}}d="index.ctx=new Map(["+d+"]);";return a?"function inject(index){"+c+e+d+"}":c+e+d};ja(O.prototype);export default {Index:O,Charset:Wa,Encoder:K,Document:V,Worker:null,Resolver:null,IndexedDB:null,Language:{}};
-export const Index=O;export const Charset=Wa;export const Encoder=K;export const Document=V;export const Worker=null;export const Resolver=null;export const IndexedDB=null;export const Language={};
\ No newline at end of file
+m[0];g=m[1];for(const n of g.entries()){g=n[0];k=n[1];h="";for(let t=0,p;t<k.length;t++){p=k[t]||[""];l="";for(let q=0;q<p.length;q++)l+=(l?",":"")+("string"===b?'"'+p[q]+'"':p[q]);l="["+l+"]";h+=(h?",":"")+l}h='new Map([["'+g+'",['+h+"]]])";h='["'+f+'",'+h+"]";d+=(d?",":"")+h}}d="index.ctx=new Map(["+d+"]);";return a?"function inject(index){"+c+e+d+"}":c+e+d};ja(O.prototype);export default {Index:O,Charset:Va,Encoder:K,Document:V,Worker:null,Resolver:null,IndexedDB:null,Language:{}};
+export const Index=O;export const Charset=Va;export const Encoder=K;export const Document=V;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 b631dbe..cda9312 100644
--- a/dist/flexsearch.es5.debug.js
+++ b/dist/flexsearch.es5.debug.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.115 (ES5/Debug)
+ * FlexSearch.js v0.8.117 (ES5/Debug)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -1157,29 +1157,25 @@ function Ha(a) {
   });
 }
 ;function Ia(a) {
-  Ja.call(a, "add");
-  Ja.call(a, "append");
-  Ja.call(a, "search");
-  Ja.call(a, "update");
-  Ja.call(a, "remove");
+  La.call(a, "add");
+  La.call(a, "append");
+  La.call(a, "search");
+  La.call(a, "update");
+  La.call(a, "remove");
 }
-var Ma, Na, Oa = {}, Pa = {};
-function Qa(a) {
-  Ma = 0;
-  Oa[a] = Pa[a];
+var Ma, Na, Oa;
+function Pa() {
+  Ma = Oa = 0;
 }
-function Ja(a) {
+function La(a) {
   this[a + "Async"] = function() {
     var b = arguments, c = b[b.length - 1];
     if ("function" === typeof c) {
       var d = c;
       delete b[b.length - 1];
     }
-    Ma || (Ma = setTimeout(Qa, 0, a), Na = Date.now());
-    Pa[a] || (Pa[a] = Oa[a] = 1000);
-    if (!--Oa[a]) {
-      Oa[a] = Pa[a] = Pa[a] * this.priority * this.priority * 3 / (Date.now() - Na) | 0 || 1;
-      Ma = clearTimeout(Ma);
+    Ma ? Oa || (Oa = Date.now() - Na >= this.priority * this.priority * 3) : (Ma = setTimeout(Pa, 0), Na = Date.now());
+    if (Oa) {
       var e = this;
       return new Promise(function(g) {
         setTimeout(function() {
@@ -1195,8 +1191,8 @@ function Ja(a) {
     return c;
   };
 }
-;var Ra = 0;
-function Sa(a) {
+;var Qa = 0;
+function Ra(a) {
   function b(g) {
     function h(k) {
       k = k.data || k;
@@ -1209,23 +1205,25 @@ function Sa(a) {
       d ? this.worker.on("message", h) : this.worker.onmessage = h;
       if (a.config) {
         return new Promise(function(k) {
-          e.h[++Ra] = function() {
+          e.h[++Qa] = function() {
             k(e);
+            1e9 < Qa && (Qa = 0);
           };
-          e.worker.postMessage({id:Ra, task:"init", factory:c, options:a});
+          e.worker.postMessage({id:Qa, task:"init", factory:c, options:a});
         });
       }
       this.worker.postMessage({task:"init", factory:c, options:a});
+      this.priority = a.priority || 4;
       return this;
     }
   }
   a = void 0 === a ? {} : a;
-  if (!this || this.constructor !== Sa) {
-    return new Sa(a);
+  if (!this || this.constructor !== Ra) {
+    return new Ra(a);
   }
   var c = "undefined" !== typeof self ? self._factory : "undefined" !== typeof window ? window._factory : null;
   c && (c = c.toString());
-  var d = "undefined" === typeof window, e = this, f = Ta(c, d, a.worker);
+  var d = "undefined" === typeof window, e = this, f = Sa(c, d, a.worker);
   return f.then ? f.then(function(g) {
     return b.call(e, g);
   }) : b.call(this, f);
@@ -1238,9 +1236,9 @@ T("remove");
 T("clear");
 T("export");
 T("import");
-Ia(Sa.prototype);
+Ia(Ra.prototype);
 function T(a) {
-  Sa.prototype[a] = function() {
+  Ra.prototype[a] = function() {
     var b = this, c = [].slice.call(arguments), d = c[c.length - 1];
     if ("function" === typeof d) {
       var e = d;
@@ -1248,17 +1246,17 @@ function T(a) {
     }
     d = new Promise(function(f) {
       "export" === a && "function" === typeof c[0] && (c[0] = null);
-      b.h[++Ra] = f;
-      b.worker.postMessage({task:a, id:Ra, args:c});
+      b.h[++Qa] = f;
+      b.worker.postMessage({task:a, id:Qa, args:c});
     });
     return e ? (d.then(e), this) : d;
   };
 }
-function Ta(a, b, c) {
+function Sa(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=" + Ha.toString()], {type:"text/javascript"}))) : new window.Worker("string" === typeof c ? c : (0,eval)("import.meta.url").replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", 
   "module/worker/worker.js"), {type:"module"});
 }
-;function Ua(a, b) {
+;function Ta(a, b) {
   b = void 0 === b ? 0 : b;
   var c = [], d = [];
   b && (b = 250000 / b * 5000 | 0);
@@ -1269,32 +1267,32 @@ function Ta(a, b, c) {
   d.length && c.push(d);
   return c;
 }
-function Va(a, b) {
+function Ua(a, b) {
   b || (b = new Map());
   for (var c = 0, d; c < a.length; c++) {
     d = a[c], b.set(d[0], d[1]);
   }
   return b;
 }
-function Wa(a, b) {
+function Va(a, b) {
   b = void 0 === b ? 0 : b;
   var c = [], d = [];
   b && (b = 250000 / b * 1000 | 0);
   a = w(a.entries());
   for (var e = a.next(); !e.done; e = a.next()) {
-    e = e.value, d.push([e[0], Ua(e[1])[0]]), d.length === b && (c.push(d), d = []);
+    e = e.value, d.push([e[0], Ta(e[1])[0]]), d.length === b && (c.push(d), d = []);
   }
   d.length && c.push(d);
   return c;
 }
-function Xa(a, b) {
+function Wa(a, b) {
   b || (b = new Map());
   for (var c = 0, d, e; c < a.length; c++) {
-    d = a[c], e = b.get(d[0]), b.set(d[0], Va(d[1], e));
+    d = a[c], e = b.get(d[0]), b.set(d[0], Ua(d[1], e));
   }
   return b;
 }
-function Ya(a) {
+function Xa(a) {
   var b = [], c = [];
   a = w(a.keys());
   for (var d = a.next(); !d.done; d = a.next()) {
@@ -1303,14 +1301,14 @@ function Ya(a) {
   c.length && b.push(c);
   return b;
 }
-function Za(a, b) {
+function Ya(a, b) {
   b || (b = new Set());
   for (var c = 0; c < a.length; c++) {
     b.add(a[c]);
   }
   return b;
 }
-function $a(a, b, c, d, e, f, g) {
+function Za(a, b, c, d, e, f, g) {
   g = void 0 === g ? 0 : g;
   var h = d && d.constructor === Array, k = h ? d.shift() : d;
   if (!k) {
@@ -1319,12 +1317,12 @@ function $a(a, b, c, d, e, f, g) {
   if ((k = a((b ? b + "." : "") + (g + 1) + "." + c, JSON.stringify(k))) && k.then) {
     var l = this;
     return k.then(function() {
-      return $a.call(l, a, b, c, h ? d : null, e, f, g + 1);
+      return Za.call(l, a, b, c, h ? d : null, e, f, g + 1);
     });
   }
-  return $a.call(this, a, b, c, h ? d : null, e, f, g + 1);
+  return Za.call(this, a, b, c, h ? d : null, e, f, g + 1);
 }
-;function ab(a, b, c, d) {
+;function $a(a, b, c, d) {
   for (var e = [], f = 0, g; f < a.index.length; f++) {
     if (g = a.index[f], b >= g.length) {
       b -= g.length;
@@ -1340,9 +1338,9 @@ function $a(a, b, c, d, e, f, g) {
   }
   return e;
 }
-function bb(a) {
+function ab(a) {
   if (!this) {
-    return new bb(a);
+    return new ab(a);
   }
   this.index = a ? [a] : [];
   this.length = a ? a.length : 0;
@@ -1389,12 +1387,12 @@ function bb(a) {
     }
     if ("slice" === d) {
       return function(e, f) {
-        return ab(b, e || 0, f || b.length, !1);
+        return $a(b, e || 0, f || b.length, !1);
       };
     }
     if ("splice" === d) {
       return function(e, f) {
-        return ab(b, e || 0, f || b.length, !0);
+        return $a(b, e || 0, f || b.length, !0);
       };
     }
     if ("constructor" === d) {
@@ -1410,13 +1408,13 @@ function bb(a) {
     return !0;
   }});
 }
-bb.prototype.clear = function() {
+ab.prototype.clear = function() {
   this.index.length = 0;
 };
-bb.prototype.destroy = function() {
+ab.prototype.destroy = function() {
   this.proxy = this.index = null;
 };
-bb.prototype.push = function() {
+ab.prototype.push = function() {
 };
 function U(a) {
   a = void 0 === a ? 8 : a;
@@ -1426,7 +1424,7 @@ function U(a) {
   this.index = J();
   this.B = [];
   this.size = 0;
-  32 < a ? (this.h = cb, this.A = BigInt(a)) : (this.h = db, this.A = a);
+  32 < a ? (this.h = bb, this.A = BigInt(a)) : (this.h = cb, this.A = a);
 }
 U.prototype.get = function(a) {
   var b = this.h(a);
@@ -1443,7 +1441,7 @@ function V(a) {
   }
   this.index = J();
   this.h = [];
-  32 < a ? (this.B = cb, this.A = BigInt(a)) : (this.B = db, this.A = a);
+  32 < a ? (this.B = bb, this.A = BigInt(a)) : (this.B = cb, this.A = a);
 }
 V.prototype.add = function(a) {
   var b = this.B(a), c = this.index[b];
@@ -1463,9 +1461,9 @@ u.clear = V.prototype.clear = function() {
   this.h = [];
   this.size = 0;
 };
-u.values = V.prototype.values = function eb() {
+u.values = V.prototype.values = function db() {
   var b, c = this, d, e, f;
-  return ra(eb, function(g) {
+  return ra(db, function(g) {
     switch(g.h) {
       case 1:
         b = 0;
@@ -1489,9 +1487,9 @@ u.values = V.prototype.values = function eb() {
     }
   });
 };
-u.keys = V.prototype.keys = function fb() {
+u.keys = V.prototype.keys = function eb() {
   var b, c = this, d, e, f;
-  return ra(fb, function(g) {
+  return ra(eb, function(g) {
     switch(g.h) {
       case 1:
         b = 0;
@@ -1515,9 +1513,9 @@ u.keys = V.prototype.keys = function fb() {
     }
   });
 };
-u.entries = V.prototype.entries = function gb() {
+u.entries = V.prototype.entries = function fb() {
   var b, c = this, d, e, f;
-  return ra(gb, function(g) {
+  return ra(fb, function(g) {
     switch(g.h) {
       case 1:
         b = 0;
@@ -1541,7 +1539,7 @@ u.entries = V.prototype.entries = function gb() {
     }
   });
 };
-function db(a) {
+function cb(a) {
   var b = Math.pow(2, this.A) - 1;
   if ("number" == typeof a) {
     return a & b;
@@ -1551,7 +1549,7 @@ function db(a) {
   }
   return 32 === this.A ? c + Math.pow(2, 31) : c;
 }
-function cb() {
+function bb() {
   throw Error("The keystore is limited to 32 for EcmaScript5");
 }
 ;W.prototype.add = function(a, b, c) {
@@ -1568,7 +1566,7 @@ function cb() {
       } else {
         var g = e.R;
         if (!g || g(b)) {
-          e.constructor === String ? e = ["" + e] : K(e) && (e = [e]), hb(b, e, this.S, 0, f, a, e[0], c);
+          e.constructor === String ? e = ["" + e] : K(e) && (e = [e]), gb(b, e, this.S, 0, f, a, e[0], c);
         }
       }
     }
@@ -1599,7 +1597,7 @@ function cb() {
               (m = f.get(l)) ? k = m : f.set(l, k = []);
               if (!c || !k.includes(a)) {
                 if (k.length === Math.pow(2, 31) - 1) {
-                  m = new bb(k);
+                  m = new ab(k);
                   if (this.fastupdate) {
                     for (var n = w(this.reg.values()), p = n.next(); !p.done; p = n.next()) {
                       p = p.value, p.includes(k) && (p[p.indexOf(k)] = m);
@@ -1633,7 +1631,7 @@ function cb() {
               q[d] = b[d];
               continue;
             }
-            ib(b, q, d, 0, d[0], f);
+            hb(b, q, d, 0, d[0], f);
           }
         }
       }
@@ -1643,21 +1641,21 @@ function cb() {
   }
   return this;
 };
-function ib(a, b, c, d, e, f) {
+function hb(a, b, c, d, e, f) {
   a = a[e];
   if (d === c.length - 1) {
     b[e] = f || a;
   } else if (a) {
     if (a.constructor === Array) {
       for (b = b[e] = Array(a.length), e = 0; e < a.length; e++) {
-        ib(a, b, c, d, e);
+        hb(a, b, c, d, e);
       }
     } else {
-      b = b[e] || (b[e] = J()), e = c[++d], ib(a, b, c, d, e);
+      b = b[e] || (b[e] = J()), e = c[++d], hb(a, b, c, d, e);
     }
   }
 }
-function hb(a, b, c, d, e, f, g, h) {
+function gb(a, b, c, d, e, f, g, h) {
   if (a = a[g]) {
     if (d === b.length - 1) {
       if (a.constructor === Array) {
@@ -1673,17 +1671,17 @@ function hb(a, b, c, d, e, f, g, h) {
     } else {
       if (a.constructor === Array) {
         for (g = 0; g < a.length; g++) {
-          hb(a, b, c, d, e, f, g, h);
+          gb(a, b, c, d, e, f, g, h);
         }
       } else {
-        g = b[++d], hb(a, b, c, d, e, f, g, h);
+        g = b[++d], gb(a, b, c, d, e, f, g, h);
       }
     }
   } else {
     e.db && e.remove(f);
   }
 }
-;function jb(a, b, c, d, e, f, g) {
+;function ib(a, b, c, d, e, f, g) {
   var h = a.length, k = [], l;
   var m = J();
   for (var n = 0, p = void 0, q; n < b; n++) {
@@ -1704,7 +1702,7 @@ function hb(a, b, c, d, e, f, g, h) {
   }
   if (a = k.length) {
     if (e) {
-      k = 1 < k.length ? kb(k, c, d, g, f) : (k = k[0]).length > c || d ? k.slice(d, c + d) : k;
+      k = 1 < k.length ? jb(k, c, d, g, f) : (k = k[0]).length > c || d ? k.slice(d, c + d) : k;
     } else {
       if (a < h) {
         return [];
@@ -1737,7 +1735,7 @@ function hb(a, b, c, d, e, f, g, h) {
   }
   return k;
 }
-function kb(a, b, c, d, e) {
+function jb(a, b, c, d, e) {
   var f = [], g = J(), h = a.length, k;
   if (d) {
     for (e = h - 1; 0 <= e; e--) {
@@ -1780,7 +1778,7 @@ function kb(a, b, c, d, e) {
   }
   return f;
 }
-function lb(a, b, c) {
+function kb(a, b, c) {
   for (var d = J(), e = [], f = 0, g; f < b.length; f++) {
     g = b[f];
     for (var h = 0; h < g.length; h++) {
@@ -1800,7 +1798,7 @@ function lb(a, b, c) {
   }
   return e;
 }
-;function mb(a, b, c, d) {
+;function lb(a, b, c, d) {
   if (!a.length) {
     return a;
   }
@@ -1830,7 +1828,7 @@ function lb(a, b, c) {
   e = 1 < e.length ? [].concat.apply([], e) : e[0];
   return d ? X.call(this, e) : e;
 }
-;function nb(a, b, c) {
+;function mb(a, b, c) {
   var d = c[0];
   if (d.then) {
     return Promise.all(c).then(function(q) {
@@ -1876,10 +1874,10 @@ function lb(a, b, c) {
   return {W:d, $:e, limit:f, offset:g, enrich:h, resolve:k, suggest:l};
 }
 ;Y.prototype.or = function() {
-  var a = nb(this, "or", arguments);
-  return ob.call(this, a.W, a.$, a.limit, a.offset, a.enrich, a.resolve);
+  var a = mb(this, "or", arguments);
+  return nb.call(this, a.W, a.$, a.limit, a.offset, a.enrich, a.resolve);
 };
-function ob(a, b, c, d, e, f) {
+function nb(a, b, c, d, e, f) {
   if (b.length) {
     var g = this;
     return Promise.all(b).then(function(h) {
@@ -1887,10 +1885,10 @@ function ob(a, b, c, d, e, f) {
       for (var k = 0, l = void 0; k < h.length; k++) {
         (l = h[k]).length && (a[k] = l);
       }
-      return ob.call(g, a, [], c, d, e, f);
+      return nb.call(g, a, [], c, d, e, f);
     });
   }
-  a.length && (this.result.length && a.push(this.result), 2 > a.length ? this.result = a[0] : (this.result = kb(a, c, d, !1, this.h), d = 0));
+  a.length && (this.result.length && a.push(this.result), 2 > a.length ? this.result = a[0] : (this.result = jb(a, c, d, !1, this.h), d = 0));
   return f ? this.resolve(c, d, e) : this;
 }
 ;Y.prototype.and = function() {
@@ -1905,7 +1903,36 @@ function ob(a, b, c, d, e, f) {
       var f = b.enrich && c;
     }
   }
-  return a ? (a = nb(this, "and", arguments), pb.call(this, a.W, a.$, a.limit, a.offset, a.enrich, a.resolve, a.suggest)) : c ? this.resolve(d, e, f) : this;
+  return a ? (a = mb(this, "and", arguments), ob.call(this, a.W, a.$, a.limit, a.offset, a.enrich, a.resolve, a.suggest)) : c ? this.resolve(d, e, f) : this;
+};
+function ob(a, b, c, d, e, f, g) {
+  if (b.length) {
+    var h = this;
+    return Promise.all(b).then(function(k) {
+      a = [];
+      for (var l = 0, m = void 0; l < k.length; l++) {
+        (m = k[l]).length && (a[l] = m);
+      }
+      return ob.call(h, a, [], c, d, e, f, g);
+    });
+  }
+  if (a.length) {
+    if (this.result.length && a.unshift(this.result), 2 > a.length) {
+      this.result = a[0];
+    } else {
+      if (b = za(a)) {
+        return this.result = ib(a, b, c, d, g, this.h, f), f ? e ? X.call(this.index, this.result) : this.result : this;
+      }
+      this.result = [];
+    }
+  } else {
+    g || (this.result = a);
+  }
+  return f ? this.resolve(c, d, e) : this;
+}
+;Y.prototype.xor = function() {
+  var a = mb(this, "xor", arguments);
+  return pb.call(this, a.W, a.$, a.limit, a.offset, a.enrich, a.resolve, a.suggest);
 };
 function pb(a, b, c, d, e, f, g) {
   if (b.length) {
@@ -1922,43 +1949,14 @@ function pb(a, b, c, d, e, f, g) {
     if (this.result.length && a.unshift(this.result), 2 > a.length) {
       this.result = a[0];
     } else {
-      if (b = za(a)) {
-        return this.result = jb(a, b, c, d, g, this.h, f), f ? e ? X.call(this.index, this.result) : this.result : this;
-      }
-      this.result = [];
+      return this.result = qb.call(this, a, c, d, f, this.h), f ? e ? X.call(this.index, this.result) : this.result : this;
     }
   } else {
     g || (this.result = a);
   }
   return f ? this.resolve(c, d, e) : this;
 }
-;Y.prototype.xor = function() {
-  var a = nb(this, "xor", arguments);
-  return qb.call(this, a.W, a.$, a.limit, a.offset, a.enrich, a.resolve, a.suggest);
-};
-function qb(a, b, c, d, e, f, g) {
-  if (b.length) {
-    var h = this;
-    return Promise.all(b).then(function(k) {
-      a = [];
-      for (var l = 0, m = void 0; l < k.length; l++) {
-        (m = k[l]).length && (a[l] = m);
-      }
-      return qb.call(h, a, [], c, d, e, f, g);
-    });
-  }
-  if (a.length) {
-    if (this.result.length && a.unshift(this.result), 2 > a.length) {
-      this.result = a[0];
-    } else {
-      return this.result = rb.call(this, a, c, d, f, this.h), f ? e ? X.call(this.index, this.result) : this.result : this;
-    }
-  } else {
-    g || (this.result = a);
-  }
-  return f ? this.resolve(c, d, e) : this;
-}
-function rb(a, b, c, d, e) {
+function qb(a, b, c, d, e) {
   for (var f = [], g = J(), h = 0, k = 0, l; k < a.length; k++) {
     if (l = a[k]) {
       h < l.length && (h = l.length);
@@ -2002,10 +2000,10 @@ function rb(a, b, c, d, e) {
   return f;
 }
 ;Y.prototype.not = function() {
-  var a = nb(this, "not", arguments);
-  return sb.call(this, a.W, a.$, a.limit, a.offset, a.enrich, a.resolve, a.suggest);
+  var a = mb(this, "not", arguments);
+  return rb.call(this, a.W, a.$, a.limit, a.offset, a.enrich, a.resolve, a.suggest);
 };
-function sb(a, b, c, d, e, f, g) {
+function rb(a, b, c, d, e, f, g) {
   if (b.length) {
     var h = this;
     return Promise.all(b).then(function(k) {
@@ -2013,17 +2011,17 @@ function sb(a, b, c, d, e, f, g) {
       for (var l = 0, m = void 0; l < k.length; l++) {
         (m = k[l]).length && (a[l] = m);
       }
-      return sb.call(h, a, [], c, d, e, f, g);
+      return rb.call(h, a, [], c, d, e, f, g);
     });
   }
   if (a.length && this.result.length) {
-    this.result = tb.call(this, a, c, d, f);
+    this.result = sb.call(this, a, c, d, f);
   } else if (f) {
     return this.resolve(c, d, e);
   }
   return f ? e ? X.call(this.index, this.result) : this.result : this;
 }
-function tb(a, b, c, d) {
+function sb(a, b, c, d) {
   var e = [];
   a = new Set(a.flat().flat());
   for (var f = 0, g, h = 0; f < this.result.length; f++) {
@@ -2096,7 +2094,7 @@ Y.prototype.boost = function(a) {
 Y.prototype.resolve = function(a, b, c) {
   var d = this.result, e = this.index;
   this.result = this.index = null;
-  return d.length ? ("object" === typeof a && (c = a.enrich, b = a.offset, a = a.limit), mb.call(e, d, a || 100, b, c)) : d;
+  return d.length ? ("object" === typeof a && (c = a.enrich, b = a.offset, a = a.limit), lb.call(e, d, a || 100, b, c)) : d;
 };
 J();
 W.prototype.search = function(a, b, c, d) {
@@ -2172,7 +2170,7 @@ W.prototype.search = function(a, b, c, d) {
               }
               h.push(k = k.db.tag(r[f + 1], b, x, q));
             } else {
-              k = ub.call(this, r[f], r[f + 1], b, x, q);
+              k = tb.call(this, r[f], r[f + 1], b, x, q);
             }
             e.push({field:r[f], tag:r[f + 1], result:k});
           }
@@ -2202,10 +2200,10 @@ W.prototype.search = function(a, b, c, d) {
         if (n) {
           if (this.db) {
             y.tag = n;
-            var Ka = v.db.support_tag_search;
+            var Ja = v.db.support_tag_search;
             y.field = m;
           }
-          Ka || (y.enrich = !1);
+          Ja || (y.enrich = !1);
         }
         if (r) {
           r[A] = v.search(a, b, y);
@@ -2220,7 +2218,7 @@ W.prototype.search = function(a, b, c, d) {
         D = [];
         G = 0;
         if (this.db && d) {
-          if (!Ka) {
+          if (!Ja) {
             for (H = m.length; H < d.length; H++) {
               var L = d[H];
               if (L && L.length) {
@@ -2232,7 +2230,7 @@ W.prototype.search = function(a, b, c, d) {
           }
         } else {
           H = 0;
-          for (var Xb = L = void 0; H < n.length; H += 2) {
+          for (var Wb = L = void 0; H < n.length; H += 2) {
             L = this.tag.get(n[H]);
             if (!L) {
               if (console.warn("Tag '" + n[H] + ":" + n[H + 1] + "' will be skipped because there is no field '" + n[H] + "'."), p) {
@@ -2241,7 +2239,7 @@ W.prototype.search = function(a, b, c, d) {
                 return h ? e : new Y(e);
               }
             }
-            if (Xb = (L = L && L.get(n[H + 1])) && L.length) {
+            if (Wb = (L = L && L.get(n[H + 1])) && L.length) {
               G++, D.push(L);
             } else if (!p) {
               return h ? e : new Y(e);
@@ -2249,7 +2247,7 @@ W.prototype.search = function(a, b, c, d) {
           }
         }
         if (G) {
-          v = lb(v, D, h);
+          v = kb(v, D, h);
           y = v.length;
           if (!y && !p) {
             return h ? v : new Y(v);
@@ -2265,7 +2263,7 @@ W.prototype.search = function(a, b, c, d) {
     }
   }
   if (r) {
-    if (this.db && n && n.length && !Ka) {
+    if (this.db && n && n.length && !Ja) {
       for (q = 0; q < n.length; q += 2) {
         f = this.index.get(n[q]);
         if (!f) {
@@ -2278,9 +2276,9 @@ W.prototype.search = function(a, b, c, d) {
         r.push(f.db.tag(n[q + 1], b, x, !1));
       }
     }
-    var Yb = this;
+    var Xb = this;
     return Promise.all(r).then(function(Q) {
-      return Q.length ? Yb.search(a, b, c, Q) : Q;
+      return Q.length ? Xb.search(a, b, c, Q) : Q;
     });
   }
   if (!g) {
@@ -2300,17 +2298,17 @@ W.prototype.search = function(a, b, c, d) {
     e[x] = {field:f[x], result:p};
   }
   if (q && this.db && r.length) {
-    var La = this;
+    var Ka = this;
     return Promise.all(r).then(function(Q) {
       for (var R = 0; R < Q.length; R++) {
         e[R].result = Q[R];
       }
-      return l ? vb(e, b) : t ? wb(e, a, La.index, La.field, La.J, t) : e;
+      return l ? ub(e, b) : t ? vb(e, a, Ka.index, Ka.field, Ka.J, t) : e;
     });
   }
-  return l ? vb(e, b) : t ? wb(e, a, this.index, this.field, this.J, t) : e;
+  return l ? ub(e, b) : t ? vb(e, a, this.index, this.field, this.J, t) : e;
 };
-function wb(a, b, c, d, e, f) {
+function vb(a, b, c, d, e, f) {
   for (var g, h, k, l = 0, m, n, p; l < a.length; l++) {
     for (m = a[l].result, n = a[l].field, k = c.get(n), p = k.encoder, k = k.tokenize, n = e[d.indexOf(n)], p !== g && (g = p, h = g.encode(b)), p = 0; p < m.length; p++) {
       var q = "", t = ya(m[p].doc, n), x = g.encode(t);
@@ -2341,7 +2339,7 @@ function wb(a, b, c, d, e, f) {
   }
   return a;
 }
-function vb(a, b) {
+function ub(a, b) {
   for (var c = [], d = J(), e = 0, f, g; e < a.length; e++) {
     f = a[e];
     g = f.result;
@@ -2359,7 +2357,7 @@ function vb(a, b) {
   }
   return c;
 }
-function ub(a, b, c, d, e) {
+function tb(a, b, c, d, e) {
   var f = this.tag.get(a);
   if (!f) {
     return console.warn("Tag '" + a + "' was not found"), [];
@@ -2389,7 +2387,7 @@ function X(a) {
   this.J = [];
   this.field = [];
   this.S = [];
-  this.key = (c = b.key || b.id) && xb(c, this.S) || "id";
+  this.key = (c = b.key || b.id) && wb(c, this.S) || "id";
   (d = a.keystore || 0) && (this.keystore = d);
   this.fastupdate = !!a.fastupdate;
   this.reg = !this.fastupdate || a.worker || a.db ? d ? new V(d) : new Set() : d ? new U(d) : new Map();
@@ -2398,7 +2396,8 @@ function X(a) {
   this.cache = (c = a.cache || null) && new Z(c);
   a.cache = !1;
   this.worker = a.worker;
-  this.index = yb.call(this, a, b);
+  this.priority = a.priority || 4;
+  this.index = xb.call(this, a, b);
   this.tag = null;
   if (c = b.tag) {
     if ("string" === typeof c && (c = [c]), c.length) {
@@ -2412,7 +2411,7 @@ function X(a) {
         if (!e) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
-        d.custom ? this.L[b] = d.custom : (this.L[b] = xb(e, this.S), d.filter && ("string" === typeof this.L[b] && (this.L[b] = new String(this.L[b])), this.L[b].R = d.filter));
+        d.custom ? this.L[b] = d.custom : (this.L[b] = wb(e, this.S), 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.tag.set(e, new Map());
       }
@@ -2492,7 +2491,7 @@ u.destroy = function() {
   }
   return Promise.all(a);
 };
-function yb(a, b) {
+function xb(a, b) {
   var c = new Map(), d = b.index || b.field || b;
   K(d) && (d = [d]);
   for (var e = 0, f, g = void 0; e < d.length; e++) {
@@ -2500,21 +2499,21 @@ function yb(a, b) {
     K(f) || (g = f, f = f.field);
     g = M(g) ? Object.assign({}, a, g) : a;
     if (this.worker) {
-      var h = new Sa(g);
+      var h = new Ra(g);
       c.set(f, h);
     }
     this.worker || c.set(f, new S(g, this.reg));
-    g.custom ? this.J[e] = g.custom : (this.J[e] = xb(f, this.S), g.filter && ("string" === typeof this.J[e] && (this.J[e] = new String(this.J[e])), this.J[e].R = g.filter));
+    g.custom ? this.J[e] = g.custom : (this.J[e] = wb(f, this.S), g.filter && ("string" === typeof this.J[e] && (this.J[e] = new String(this.J[e])), this.J[e].R = g.filter));
     this.field[e] = f;
   }
   if (this.I) {
     for (a = b.store, K(a) && (a = [a]), b = 0; b < a.length; b++) {
-      d = a[b], e = d.field || d, d.custom ? (this.I[b] = d.custom, d.custom.ja = e) : (this.I[b] = xb(e, this.S), d.filter && ("string" === typeof this.I[b] && (this.I[b] = new String(this.I[b])), this.I[b].R = d.filter));
+      d = a[b], e = d.field || d, d.custom ? (this.I[b] = d.custom, d.custom.ja = e) : (this.I[b] = wb(e, this.S), d.filter && ("string" === typeof this.I[b] && (this.I[b] = new String(this.I[b])), this.I[b].R = d.filter));
     }
   }
   return c;
 }
-function xb(a, b) {
+function wb(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);
   }
@@ -2581,7 +2580,7 @@ u.set = function(a, b) {
   this.store.set(a, b);
   return this;
 };
-u.searchCache = zb;
+u.searchCache = yb;
 u.export = function(a, b, c, d) {
   c = void 0 === c ? 0 : c;
   d = void 0 === d ? 0 : d;
@@ -2598,27 +2597,23 @@ u.export = function(a, b, c, d) {
   switch(d) {
     case 0:
       var g = "reg";
-      var h = Ya(this.reg);
+      var h = Xa(this.reg);
       b = null;
       break;
     case 1:
       g = "tag";
-      h = Wa(this.tag, this.reg.size);
+      h = this.tag && Va(this.tag, this.reg.size);
       b = null;
       break;
     case 2:
       g = "doc";
-      h = Ua(this.store);
+      h = this.store && Ta(this.store);
       b = null;
       break;
-    case 3:
-      g = "cfg";
-      b = h = null;
-      break;
     default:
       return;
   }
-  return $a.call(this, a, b, g, h, c, d);
+  return Za.call(this, a, b, g, h, c, d);
 };
 u.import = function(a, b) {
   var c = a.split(".");
@@ -2636,7 +2631,7 @@ u.import = function(a, b) {
     switch(c) {
       case "reg":
         this.fastupdate = !1;
-        this.reg = Za(b, this.reg);
+        this.reg = Ya(b, this.reg);
         for (b = 0; b < this.field.length; b++) {
           d = this.index.get(this.field[b]), d.fastupdate = !1, d.reg = this.reg;
         }
@@ -2650,15 +2645,15 @@ u.import = function(a, b) {
         }
         break;
       case "tag":
-        this.tag = Xa(b, this.tag);
+        this.tag = Wa(b, this.tag);
         break;
       case "doc":
-        this.store = Va(b, this.store);
+        this.store = Ua(b, this.store);
     }
   }
 };
 Ia(W.prototype);
-function zb(a, b, c) {
+function yb(a, b, c) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
   this.cache || (this.cache = new Z());
   var d = this.cache.get(a);
@@ -2700,29 +2695,29 @@ Z.prototype.clear = function() {
   this.cache.clear();
   this.h = "";
 };
-var Ab = {normalize:function(a) {
+var zb = {normalize:function(a) {
   return a.toLowerCase();
 }};
-var Bb = 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"]]);
-var Cb = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), Db = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
-var Eb = {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};
+var Ab = 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"]]);
+var Bb = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), Cb = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
+var Db = {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};
+var Eb = /[\x00-\x7F]+/g;
 var Fb = /[\x00-\x7F]+/g;
 var Gb = /[\x00-\x7F]+/g;
-var Hb = /[\x00-\x7F]+/g;
-var Ib = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:Ab, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:Bb}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:Bb, matcher:Cb, replacer:Db}, LatinExtra:{normalize:!0, dedupe:!0, mapper:Bb, replacer:Db.concat([/(?!^)[aeo]/g, ""]), matcher:Cb}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
+var Hb = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:zb, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:Ab}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:Ab, matcher:Bb, replacer:Cb}, LatinExtra:{normalize:!0, dedupe:!0, mapper:Ab, replacer:Cb.concat([/(?!^)[aeo]/g, ""]), matcher:Bb}, 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 = Eb[d], f = 1, g; f < c.length && (g = c.charAt(f), "h" === g || "w" === g || !(g = Eb[g]) || g === e || (d += g, e = g, 4 !== d.length)); f++) {
+    for (var c = a[b], d = c.charAt(0), e = Db[d], f = 1, g; f < c.length && (g = c.charAt(f), "h" === g || "w" === g || !(g = Db[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(Fb, " ");
+  return ("" + a).replace(Eb, " ");
 }}, CjkDefault:{normalize:!1, dedupe:!0, split:"", prepare:function(a) {
-  return ("" + a).replace(Gb, "");
+  return ("" + a).replace(Fb, "");
 }}, CyrillicDefault:{normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(Hb, " ");
+  return ("" + a).replace(Gb, " ");
 }}};
-var Jb = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
+var Ib = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
 S.prototype.add = function(a, b, c, d) {
   if (b && (a || 0 === a)) {
     if (!d && !c && this.reg.has(a)) {
@@ -2733,15 +2728,15 @@ S.prototype.add = function(a, b, c, d) {
       for (var e = J(), f = J(), g = this.depth, h = this.resolution, k = 0; k < d; k++) {
         var l = b[this.rtl ? d - 1 - k : k], m = l.length;
         if (m && (g || !f[l])) {
-          var n = this.score ? this.score(b, l, k, null, 0) : Kb(h, d, k), p = "";
+          var n = this.score ? this.score(b, l, k, null, 0) : Jb(h, 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 t = this.score ? this.score(b, l, k, p, n) : Kb(h, d, k, m, n);
-                    Lb(this, f, p, t, a, c);
+                    var t = this.score ? this.score(b, l, k, p, n) : Jb(h, d, k, m, n);
+                    Kb(this, f, p, t, a, c);
                   }
                 }
                 break;
@@ -2749,24 +2744,24 @@ S.prototype.add = function(a, b, c, d) {
             case "reverse":
               if (1 < m) {
                 for (q = m - 1; 0 < q; q--) {
-                  p = l[q] + p, t = this.score ? this.score(b, l, k, p, q) : Kb(h, d, k, m, q), Lb(this, f, p, t, a, c);
+                  p = l[q] + p, t = this.score ? this.score(b, l, k, p, q) : Jb(h, d, k, m, q), Kb(this, f, p, t, a, c);
                 }
                 p = "";
               }
             case "forward":
               if (1 < m) {
                 for (q = 0; q < m; q++) {
-                  p += l[q], Lb(this, f, p, n, a, c);
+                  p += l[q], Kb(this, f, p, n, a, c);
                 }
                 break;
               }
             default:
-              if (Lb(this, f, l, n, a, c), g && 1 < d && k < d - 1) {
+              if (Kb(this, f, l, n, a, c), g && 1 < d && k < d - 1) {
                 for (m = J(), p = this.da, n = l, q = Math.min(g + 1, d - k), t = m[n] = 1; t < q; t++) {
                   if ((l = b[this.rtl ? d - 1 - k - t : k + t]) && !m[l]) {
                     m[l] = 1;
-                    var x = this.score ? this.score(b, n, k, l, t) : Kb(p + (d / 2 > p ? 0 : 1), d, k, q - 1, t - 1), r = this.bidirectional && l > n;
-                    Lb(this, e, r ? n : l, x, a, c, r ? l : n);
+                    var x = this.score ? this.score(b, n, k, l, t) : Jb(p + (d / 2 > p ? 0 : 1), d, k, q - 1, t - 1), r = this.bidirectional && l > n;
+                    Kb(this, e, r ? n : l, x, a, c, r ? l : n);
                   }
                 }
               }
@@ -2778,15 +2773,15 @@ S.prototype.add = function(a, b, c, d) {
       b = "";
     }
   }
-  this.db && (b || this.commit_task.push({del:a}), this.ca && Mb(this));
+  this.db && (b || this.commit_task.push({del:a}), this.ca && Lb(this));
   return this;
 };
-function Lb(a, b, c, d, e, f, g) {
+function Kb(a, b, c, d, e, f, g) {
   var h = g ? a.ctx : a.map, k;
   if (!b[c] || g && !(k = b[c])[g]) {
     if (g ? (b = k || (b[c] = J()), b[g] = 1, (k = h.get(g)) ? h = k : h.set(g, h = new Map())) : b[c] = 1, (k = h.get(c)) ? h = k : h.set(c, h = k = []), h = h[d] || (h[d] = []), !f || !h.includes(e)) {
       if (h.length === Math.pow(2, 31) - 1) {
-        b = new bb(h);
+        b = new ab(h);
         if (a.fastupdate) {
           for (c = w(a.reg.values()), f = c.next(); !f.done; f = c.next()) {
             f = f.value, f.includes(h) && (f[f.indexOf(h)] = b);
@@ -2799,7 +2794,7 @@ function Lb(a, b, c, d, e, f, g) {
     }
   }
 }
-function Kb(a, b, c, d, e) {
+function Jb(a, b, c, d, e) {
   return c && 1 < a ? b + (d || 0) <= a ? c + (e || 0) : (a - 1) / (b + (d || 0)) * (c + (e || 0)) + 1 | 0 : 0;
 }
 ;S.prototype.search = function(a, b, c) {
@@ -2822,11 +2817,11 @@ function Kb(a, b, c, d, e) {
   var q = p.length;
   b = b || (f ? 100 : 0);
   if (1 === q) {
-    return Nb.call(this, p[0], "", b, e, f, k, n);
+    return Mb.call(this, p[0], "", b, e, f, k, n);
   }
   g = this.depth && !1 !== g;
   if (2 === q && g && !h) {
-    return Nb.call(this, p[0], p[1], b, e, f, k, n);
+    return Mb.call(this, p[0], p[1], b, e, f, k, n);
   }
   var t = J(), x = 0;
   if (1 < q && g) {
@@ -2856,10 +2851,10 @@ function Kb(a, b, c, d, e) {
               break;
             }
             t[v] = 1;
-            return E(y, Ob(A, v, r, 0, 0, !1, !1), 6);
+            return E(y, Nb(A, v, r, 0, 0, !1, !1), 6);
           case 6:
             z = y.D;
-            if (z = Pb(z, d, h, m)) {
+            if (z = Ob(z, d, h, m)) {
               d = z;
               y.h = 4;
               break;
@@ -2871,7 +2866,7 @@ function Kb(a, b, c, d, e) {
             y.h = 2;
             break;
           case 4:
-            return y.return(Qb(d, m, b, e, h, l, f));
+            return y.return(Pb(d, m, b, e, h, l, f));
         }
       });
     }();
@@ -2879,8 +2874,8 @@ function Kb(a, b, c, d, e) {
   for (c = a = void 0; x < q; x++) {
     if ((c = p[x]) && !t[c]) {
       t[c] = 1;
-      a = Ob(this, c, r, 0, 0, !1, !1);
-      if (a = Pb(a, d, h, m)) {
+      a = Nb(this, c, r, 0, 0, !1, !1);
+      if (a = Ob(a, d, h, m)) {
         d = a;
         break;
       }
@@ -2888,24 +2883,24 @@ function Kb(a, b, c, d, e) {
     }
     h && r && x === q - 1 && !d.length && (r = "", x = -1, t = J());
   }
-  return Qb(d, m, b, e, h, l, f);
+  return Pb(d, m, b, e, h, l, f);
 };
-function Qb(a, b, c, d, e, f, g) {
+function Pb(a, b, c, d, e, f, g) {
   var h = a.length, k = a;
   if (1 < h) {
-    k = jb(a, b, c, d, e, f, g);
+    k = ib(a, b, c, d, e, f, g);
   } else if (1 === h) {
-    return g ? mb.call(null, a[0], c, d) : new Y(a[0]);
+    return g ? lb.call(null, a[0], c, d) : new Y(a[0]);
   }
   return g ? k : new Y(k);
 }
-function Nb(a, b, c, d, e, f, g) {
-  a = Ob(this, a, b, c, d, e, f, g);
+function Mb(a, b, c, d, e, f, g) {
+  a = Nb(this, a, b, c, d, e, f, g);
   return this.db ? a.then(function(h) {
     return e ? h || [] : new Y(h);
-  }) : a && a.length ? e ? mb.call(this, a, c, d) : new Y(a) : e ? [] : new Y();
+  }) : a && a.length ? e ? lb.call(this, a, c, d) : new Y(a) : e ? [] : new Y();
 }
-function Pb(a, b, c, d) {
+function Ob(a, b, c, d) {
   var e = [];
   if (a && a.length) {
     if (a.length <= d) {
@@ -2926,7 +2921,7 @@ function Pb(a, b, c, d) {
     return e;
   }
 }
-function Ob(a, b, c, d, e, f, g, h) {
+function Nb(a, b, c, d, e, f, g, h) {
   var k;
   c && (k = a.bidirectional && b > c) && (k = c, c = b, b = k);
   if (a.db) {
@@ -2950,15 +2945,15 @@ function Ob(a, b, c, d, e, f, g, h) {
         }
       }
     } else {
-      Rb(this.map, a), this.depth && Rb(this.ctx, a);
+      Qb(this.map, a), this.depth && Qb(this.ctx, a);
     }
     b || this.reg.delete(a);
   }
-  this.db && (this.commit_task.push({del:a}), this.ca && Mb(this));
+  this.db && (this.commit_task.push({del:a}), this.ca && Lb(this));
   this.cache && this.cache.remove(a);
   return this;
 };
-function Rb(a, b) {
+function Qb(a, b) {
   var c = 0;
   if (a.constructor === Array) {
     for (var d = 0, e = void 0, f; d < a.length; d++) {
@@ -2973,7 +2968,7 @@ function Rb(a, b) {
     }
   } else {
     for (d = w(a.entries()), e = d.next(); !e.done; e = d.next()) {
-      f = e.value, e = f[0], (f = Rb(f[1], b)) ? c += f : a.delete(e);
+      f = e.value, e = f[0], (f = Qb(f[1], b)) ? c += f : a.delete(e);
     }
   }
   return c;
@@ -2984,12 +2979,12 @@ function Rb(a, b) {
   }
   if (a) {
     var c = K(a) ? a : a.preset;
-    c && (Jb[c] || console.warn("Preset not found: " + c), a = Object.assign({}, Jb[c], a));
+    c && (Ib[c] || console.warn("Preset not found: " + c), a = Object.assign({}, Ib[c], a));
   } else {
     a = {};
   }
   c = a.context;
-  var d = !0 === c ? {depth:1} : c || {}, e = K(a.encoder) ? Ib[a.encoder] : a.encode || a.encoder || Ab;
+  var d = !0 === c ? {depth:1} : c || {}, e = K(a.encoder) ? Hb[a.encoder] : a.encode || a.encoder || zb;
   this.encoder = e.encode ? e : "object" === typeof e ? new Ga(e) : {encode:e};
   this.resolution = a.resolution || 9;
   this.tokenize = (c = a.tokenize) && "default" !== c && c || "strict";
@@ -3026,11 +3021,11 @@ u.destroy = function() {
   this.commit_timer && (clearTimeout(this.commit_timer), this.commit_timer = null);
   return this.db.destroy();
 };
-function Mb(a) {
+function Lb(a) {
   a.commit_timer || (a.commit_timer = setTimeout(function() {
     a.commit_timer = null;
     a.db.commit(a, void 0, void 0);
-  }, 0));
+  }, 1));
 }
 u.clear = function() {
   this.map.clear();
@@ -3052,7 +3047,7 @@ u.update = function(a, b) {
     return c.add(a, b);
   }) : this.add(a, b);
 };
-function Sb(a) {
+function Rb(a) {
   var b = 0;
   if (a.constructor === Array) {
     for (var c = 0, d = void 0; c < a.length; c++) {
@@ -3062,7 +3057,7 @@ function Sb(a) {
     for (c = w(a), d = c.next(); !d.done; d = c.next()) {
       var e = d.value;
       d = e[0];
-      (e = Sb(e[1])) ? b += e : a.delete(d);
+      (e = Rb(e[1])) ? b += e : a.delete(d);
     }
   }
   return b;
@@ -3071,18 +3066,18 @@ u.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
-  Sb(this.map);
-  this.depth && Sb(this.ctx);
+  Rb(this.map);
+  this.depth && Rb(this.ctx);
   return this;
 };
-u.searchCache = zb;
+u.searchCache = yb;
 u.export = function(a, b, c, d) {
   c = void 0 === c ? 0 : c;
   d = void 0 === d ? 0 : d;
   switch(d) {
     case 0:
       var e = "reg";
-      var f = Ya(this.reg);
+      var f = Xa(this.reg);
       break;
     case 1:
       e = "cfg";
@@ -3090,29 +3085,29 @@ u.export = function(a, b, c, d) {
       break;
     case 2:
       e = "map";
-      f = Ua(this.map, this.reg.size);
+      f = Ta(this.map, this.reg.size);
       break;
     case 3:
       e = "ctx";
-      f = Wa(this.ctx, this.reg.size);
+      f = Va(this.ctx, this.reg.size);
       break;
     default:
       return;
   }
-  return $a.call(this, a, b, e, f, c, d);
+  return Za.call(this, a, b, e, f, c, d);
 };
 u.import = function(a, b) {
   if (b) {
     switch("string" === typeof b && (b = JSON.parse(b)), a = a.split("."), "json" === a[a.length - 1] && a.pop(), 3 === a.length && a.shift(), a = 1 < a.length ? a[1] : a[0], a) {
       case "reg":
         this.fastupdate = !1;
-        this.reg = Za(b, this.reg);
+        this.reg = Ya(b, this.reg);
         break;
       case "map":
-        this.map = Va(b, this.map);
+        this.map = Ua(b, this.map);
         break;
       case "ctx":
-        this.ctx = Xa(b, this.ctx);
+        this.ctx = Wa(b, this.ctx);
     }
   }
 };
@@ -3169,11 +3164,11 @@ u.serialize = function(a) {
   return a ? "function inject(index){" + b + d + e + "}" : b + d + e;
 };
 Ia(S.prototype);
-var Tb = "undefined" !== typeof window && (window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB), Ub = ["map", "ctx", "tag", "reg", "cfg"];
-function Vb(a, b) {
+var Sb = "undefined" !== typeof window && (window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB), Tb = ["map", "ctx", "tag", "reg", "cfg"];
+function Ub(a, b) {
   b = void 0 === b ? {} : b;
   if (!this) {
-    return new Vb(a, b);
+    return new Ub(a, b);
   }
   "object" === typeof a && (b = a, a = a.name);
   a || console.info("Default storage space was used, because a name was not passed.");
@@ -3184,7 +3179,7 @@ function Vb(a, b) {
   this.db = null;
   this.h = {};
 }
-u = Vb.prototype;
+u = Ub.prototype;
 u.mount = function(a) {
   if (!a.encoder) {
     return a.mount(this);
@@ -3196,10 +3191,10 @@ u.open = function() {
   var a = this;
   navigator.storage && navigator.storage.persist();
   return this.db || new Promise(function(b, c) {
-    var d = Tb.open(a.id + (a.field ? ":" + a.field : ""), 1);
+    var d = Sb.open(a.id + (a.field ? ":" + a.field : ""), 1);
     d.onupgradeneeded = function() {
       var e = a.db = this.result;
-      Ub.forEach(function(f) {
+      Tb.forEach(function(f) {
         e.objectStoreNames.contains(f) || e.createObjectStore(f);
       });
     };
@@ -3225,14 +3220,14 @@ u.close = function() {
   this.db = null;
 };
 u.destroy = function() {
-  var a = Tb.deleteDatabase(this.id + (this.field ? ":" + this.field : ""));
-  return Wb(a);
+  var a = Sb.deleteDatabase(this.id + (this.field ? ":" + this.field : ""));
+  return Vb(a);
 };
 u.clear = function() {
-  for (var a = this.db.transaction(Ub, "readwrite"), b = 0; b < Ub.length; b++) {
-    a.objectStore(Ub[b]).clear();
+  for (var a = this.db.transaction(Tb, "readwrite"), b = 0; b < Tb.length; b++) {
+    a.objectStore(Tb[b]).clear();
   }
-  return Wb(a);
+  return Vb(a);
 };
 u.get = function(a, b, c, d, e, f) {
   c = void 0 === c ? 0 : c;
@@ -3241,7 +3236,7 @@ u.get = function(a, b, c, d, e, f) {
   f = void 0 === f ? !1 : f;
   a = this.db.transaction(b ? "ctx" : "map", "readonly").objectStore(b ? "ctx" : "map").get(b ? b + ":" + a : a);
   var g = this;
-  return Wb(a).then(function(h) {
+  return Vb(a).then(function(h) {
     var k = [];
     if (!h || !h.length) {
       return k;
@@ -3276,7 +3271,7 @@ 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 Wb(a).then(function(f) {
+  return Vb(a).then(function(f) {
     if (!f || !f.length || c >= f.length) {
       return [];
     }
@@ -3290,7 +3285,7 @@ u.tag = function(a, b, c, d) {
 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] = Wb(b.get(a[d]));
+    c[d] = Vb(b.get(a[d]));
   }
   return Promise.all(c).then(function(e) {
     for (var f = 0; f < e.length; f++) {
@@ -3301,7 +3296,7 @@ u.enrich = function(a) {
 };
 u.has = function(a) {
   a = this.db.transaction("reg", "readonly").objectStore("reg").getKey(a);
-  return Wb(a);
+  return Vb(a);
 };
 u.search = null;
 u.info = function() {
@@ -3379,8 +3374,8 @@ u.commit = function(a, b, c) {
         a.commit_task = [];
       case 3:
         return a.reg.size ? E(h, d.transaction("map", "readwrite", function(k) {
-          for (var l = w(a.map), m = l.next(), n = {}; !m.done; n = {O:void 0, Z:void 0}, m = l.next()) {
-            m = m.value, n.Z = m[0], n.O = m[1], n.O.length && (b ? k.put(n.O, n.Z) : k.get(n.Z).onsuccess = function(p) {
+          for (var l = w(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, t;
                 if (q && q.length) {
@@ -3399,7 +3394,7 @@ u.commit = function(a, b, c) {
                 } else {
                   q = p.O, t = 1;
                 }
-                t && k.put(q, p.Z);
+                t && k.put(q, p.Y);
               };
             }(n));
           }
@@ -3410,8 +3405,8 @@ u.commit = function(a, b, c) {
             m = m.value;
             n.V = m[0];
             m = w(m[1]);
-            for (var p = m.next(), q = {}; !p.done; q = {P:void 0, Y:void 0}, p = m.next()) {
-              p = p.value, q.Y = p[0], q.P = p[1], q.P.length && (b ? k.put(q.P, n.V + ":" + q.Y) : k.get(n.V + ":" + q.Y).onsuccess = function(t, x) {
+            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.V + ":" + q.Z) : k.get(n.V + ":" + q.Z).onsuccess = function(t, x) {
                 return function() {
                   var r = this.result, A;
                   if (r && r.length) {
@@ -3430,7 +3425,7 @@ u.commit = function(a, b, c) {
                   } else {
                     r = t.P, A = 1;
                   }
-                  A && k.put(r, x.V + ":" + t.Y);
+                  A && k.put(r, x.V + ":" + t.Z);
                 };
               }(q, n));
             }
@@ -3477,7 +3472,7 @@ u.commit = function(a, b, c) {
     }
   });
 };
-function Zb(a, b, c) {
+function Yb(a, b, c) {
   for (var d = a.value, e, f, g = 0, h = 0, k; h < d.length; h++) {
     if (k = c ? d : d[h]) {
       for (var l = 0, m, n; l < b.length; l++) {
@@ -3504,17 +3499,17 @@ u.remove = function(a) {
   return Promise.all([this.transaction("map", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       var c = this.result;
-      c && Zb(c, a);
+      c && Yb(c, a);
     };
   }), this.transaction("ctx", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       var c = this.result;
-      c && Zb(c, a);
+      c && Yb(c, a);
     };
   }), this.transaction("tag", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       var c = this.result;
-      c && Zb(c, a, !0);
+      c && Yb(c, a, !0);
     };
   }), this.transaction("reg", "readwrite", function(b) {
     for (var c = 0; c < a.length; c++) {
@@ -3522,7 +3517,7 @@ u.remove = function(a) {
     }
   })]);
 };
-function Wb(a) {
+function Vb(a) {
   return new Promise(function(b, c) {
     a.onsuccess = function() {
       b(this.result);
@@ -3534,8 +3529,8 @@ function Wb(a) {
     a = null;
   });
 }
-;var $b = {Index:S, Charset:Ib, Encoder:Ga, Document:W, Worker:Sa, Resolver:Y, IndexedDB:Vb, Language:{}}, ac = "undefined" !== typeof self ? self : "undefined" !== typeof global ? global : "undefined" !== typeof window ? window : {}, bc;
-(bc = ac.define) && bc.amd ? bc([], function() {
-  return $b;
-}) : "object" === typeof ac.exports ? ac.exports = $b : ac.FlexSearch = $b;
+;var Zb = {Index:S, Charset:Hb, Encoder:Ga, Document:W, Worker:Ra, Resolver:Y, IndexedDB:Ub, Language:{}}, $b = "undefined" !== typeof self ? self : "undefined" !== typeof global ? global : "undefined" !== typeof window ? window : {}, ac;
+(ac = $b.define) && ac.amd ? ac([], function() {
+  return Zb;
+}) : "object" === typeof $b.exports ? $b.exports = Zb : $b.FlexSearch = Zb;
 }(this||self));
diff --git a/dist/flexsearch.es5.min.js b/dist/flexsearch.es5.min.js
index 8082aaf..a90a7f1 100644
--- a/dist/flexsearch.es5.min.js
+++ b/dist/flexsearch.es5.min.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.115 (ES5)
+ * FlexSearch.js v0.8.117 (ES5)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -53,86 +53,86 @@ d=[],e=this.split||""===this.split?a.split(this.split):a,g=0,f=void 0,h=void 0;g
 (f="");if(f&&(this.mapper||this.dedupe&&1<f.length)){k="";for(var l=0,m="",n=void 0,p=void 0;l<f.length;l++)n=f.charAt(l),n===m&&this.dedupe||((p=this.mapper&&this.mapper.get(n))||""===p?p===m&&this.dedupe||!(m=p)||(k+=p):k+=m=n);f=k}this.matcher&&1<f.length&&(this.M||(this.M=new RegExp("("+this.h+")","g")),f=f.replace(this.M,function(q){return b.matcher.get(q)}));if(f&&this.replacer)for(k=0;f&&k<this.replacer.length;k+=2)f=f.replace(this.replacer[k],this.replacer[k+1]);this.cache&&h.length<=this.H&&
 (this.C.set(h,f),this.C.size>this.T&&(this.C.clear(),this.H=this.H/1.1|0));f&&d.push(f)}this.finalize&&(d=this.finalize(d)||d);this.cache&&a.length<=this.G&&(this.B.set(a,d),this.B.size>this.T&&(this.B.clear(),this.G=this.G/1.1|0));return d};function N(a){a.D=null;a.B.clear();a.C.clear()};var O,Ha;
 function Ia(a){var b,c,d,e,g,f;return ta(function(h){switch(h.h){case 1:a=a.data;b=a.task;c=a.id;d=a.args;switch(b){case "init":Ha=a.options||{};(e=a.factory)?(Function("return "+e)()(self),O=new self.FlexSearch.Index(Ha),delete self.FlexSearch):O=new R(Ha);postMessage({id:c});break;default:h.h=2;return}h.h=0;break;case 2:"export"===b&&(d[1]?(d[0]=Ha.export,d[2]=0,d[3]=1):d=null);if("import"===b){if(!d[0]){h.h=5;break}return E(h,Ha.import.call(O,d[0]),9)}g=d&&O[b].apply(O,d);if(!g||!g.then){h.h=5;
-break}return E(h,g,7);case 7:g=h.D;h.h=5;break;case 9:f=h.D,O.import(d[0],f);case 5:postMessage("search"===b?{id:c,msg:g}:{id:c}),h.h=0}})};function Ja(a){Ma.call(a,"add");Ma.call(a,"append");Ma.call(a,"search");Ma.call(a,"update");Ma.call(a,"remove")}var Na,Oa,Pa={},Qa={};function Ra(a){Na=0;Pa[a]=Qa[a]}
-function Ma(a){this[a+"Async"]=function(){var b=arguments,c=b[b.length-1];if("function"===typeof c){var d=c;delete b[b.length-1]}Na||(Na=setTimeout(Ra,0,a),Oa=Date.now());Qa[a]||(Qa[a]=Pa[a]=1E3);if(!--Pa[a]){Pa[a]=Qa[a]=Qa[a]*this.priority*this.priority*3/(Date.now()-Oa)|0||1;Na=clearTimeout(Na);var e=this;return new Promise(function(f){setTimeout(function(){f(e[a+"Async"].apply(e,b))},0)})}var g=this[a].apply(this,b);c=g.then?g:new Promise(function(f){return f(g)});d&&c.then(d);return c}};var Sa=0;
-function S(a){function b(f){function h(k){k=k.data||k;var l=k.id,m=l&&e.h[l];m&&(m(k.msg),delete e.h[l])}this.worker=f;this.h=J();if(this.worker){d?this.worker.on("message",h):this.worker.onmessage=h;if(a.config)return new Promise(function(k){e.h[++Sa]=function(){k(e)};e.worker.postMessage({id:Sa,task:"init",factory:c,options:a})});this.worker.postMessage({task:"init",factory:c,options:a});return this}}a=void 0===a?{}:a;if(!this||this.constructor!==S)return new S(a);var c="undefined"!==typeof self?self._factory:
-"undefined"!==typeof window?window._factory:null;c&&(c=c.toString());var d="undefined"===typeof window,e=this,g=Ta(c,d,a.worker);return g.then?g.then(function(f){return b.call(e,f)}):b.call(this,g)}T("add");T("append");T("search");T("update");T("remove");T("clear");T("export");T("import");Ja(S.prototype);
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+function(k){for(var l=w(a.ctx),m=l.next(),n={};!m.done;n={V:void 0},m=l.next()){m=m.value;n.V=m[0];m=w(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.V+":"+q.Z):k.get(n.V+":"+q.Z).onsuccess=function(r,x){return function(){var t=this.result,A;if(t&&t.length)for(var z=Math.max(t.length,r.P.length),v=0,y;v<z;v++){if((y=r.P[v])&&y.length){if((A=t[v])&&A.length)for(var D=0;D<y.length;D++)A.push(y[D]);else t[v]=y;A=1}}else t=
+r.P,A=1;A&&k.put(t,x.V+":"+r.Z)}}(q,n))}}),14);case 14:if(a.store)return E(h,d.transaction("reg","readwrite",function(k){for(var l=w(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 E(h,d.transaction("reg","readwrite",function(k){for(var l=w(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 E(h,d.transaction("tag","readwrite",function(k){for(var l=
 w(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(),h.h=0}})};
-function Zb(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&&Zb(c,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){var c=this.result;c&&Zb(c,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){var c=this.result;c&&Zb(c,a,!0)}}),this.transaction("reg","readwrite",function(b){for(var c=0;c<a.length;c++)b.delete(a[c])})])};
-function Yb(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 $b={Index:R,Charset:Ib,Encoder:Ga,Document:W,Worker:S,Resolver:Y,IndexedDB:Vb,Language:{}},ac="undefined"!==typeof self?self:"undefined"!==typeof global?global:"undefined"!==typeof window?window:{},bc;(bc=ac.define)&&bc.amd?bc([],function(){return $b}):"object"===typeof ac.exports?ac.exports=$b:ac.FlexSearch=$b;}(this||self));
+function Yb(a,b,c){for(var d=a.value,e,g,f=0,h=0,k;h<d.length;h++){if(k=c?d:d[h]){for(var l=0,m,n;l<b.length;l++)if(n=b[l],m=k.indexOf(g?parseInt(n,10):n),0>m&&!g&&"string"===typeof n&&!isNaN(n)&&(m=k.indexOf(parseInt(n,10)))&&(g=1),0<=m)if(e=1,1<k.length)k.splice(m,1);else{d[h]=[];break}f+=k.length}if(c)break}f?e&&a.update(d):a.delete();a.continue()}
+u.remove=function(a){"object"!==typeof a&&(a=[a]);return Promise.all([this.transaction("map","readwrite",function(b){b.openCursor().onsuccess=function(){var c=this.result;c&&Yb(c,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){var c=this.result;c&&Yb(c,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){var c=this.result;c&&Yb(c,a,!0)}}),this.transaction("reg","readwrite",function(b){for(var c=0;c<a.length;c++)b.delete(a[c])})])};
+function Xb(a){return new Promise(function(b,c){a.onsuccess=function(){b(this.result)};a.oncomplete=function(){b(this.result)};a.onerror=c;a=null})};var Zb={Index:R,Charset:Hb,Encoder:Ga,Document:W,Worker:Ra,Resolver:Y,IndexedDB:Ub,Language:{}},$b="undefined"!==typeof self?self:"undefined"!==typeof global?global:"undefined"!==typeof window?window:{},ac;(ac=$b.define)&&ac.amd?ac([],function(){return Zb}):"object"===typeof $b.exports?$b.exports=Zb:$b.FlexSearch=Zb;}(this||self));
diff --git a/dist/flexsearch.light.debug.js b/dist/flexsearch.light.debug.js
index 9d38c1f..8a6a1f5 100644
--- a/dist/flexsearch.light.debug.js
+++ b/dist/flexsearch.light.debug.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.115 (Light/Debug)
+ * FlexSearch.js v0.8.117 (Light/Debug)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
diff --git a/dist/flexsearch.light.min.js b/dist/flexsearch.light.min.js
index 7c83dee..0db6021 100644
--- a/dist/flexsearch.light.min.js
+++ b/dist/flexsearch.light.min.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.115 (Light)
+ * FlexSearch.js v0.8.117 (Light)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
diff --git a/dist/flexsearch.light.module.debug.js b/dist/flexsearch.light.module.debug.js
index 289b0b8..216b973 100644
--- a/dist/flexsearch.light.module.debug.js
+++ b/dist/flexsearch.light.module.debug.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.115 (Bundle/Debug)
+ * FlexSearch.js v0.8.117 (Bundle/Debug)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
diff --git a/dist/flexsearch.light.module.min.js b/dist/flexsearch.light.module.min.js
index c764cd3..197e8e1 100644
--- a/dist/flexsearch.light.module.min.js
+++ b/dist/flexsearch.light.module.min.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.115 (Bundle)
+ * FlexSearch.js v0.8.117 (Bundle)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
diff --git a/dist/module-debug/async.js b/dist/module-debug/async.js
index 1b5ac54..88fdcec 100644
--- a/dist/module-debug/async.js
+++ b/dist/module-debug/async.js
@@ -10,14 +10,11 @@ export default function (prototype) {
     register.call(prototype, "remove");
 }
 
-let timer, timestamp;
-const current = {},
-      limit = {};
+let timer, timestamp, cycle;
 
 
-function tick(key) {
-    timer = 0;
-    current[key] = limit[key];
+function tick() {
+    timer = cycle = 0;
 }
 
 /**
@@ -37,22 +34,24 @@ function register(key) {
             delete args[args.length - 1];
         }
 
-        // balance when polling the event loop
+        // event loop runtime balancer
         if (!timer) {
-            timer = setTimeout(tick, 0, key);
+            // when the next event loop occurs earlier than task completion
+            // it will reset the state immediately
+            timer = setTimeout(tick, 0);
             timestamp = Date.now();
-        }
-        if (!limit[key]) {
-            limit[key] = current[key] = 1000;
-        }
-        if (! --current[key]) {
+        } else if (!cycle) {
             const now = Date.now(),
                   duration = now - timestamp,
                   target = 3 * (this.priority * this.priority);
 
-            current[key] = limit[key] = 0 | limit[key] * target / duration || 1;
-            timer = clearTimeout(timer);
+            cycle = duration >= target;
+        }
+
+        // cycle all instances from this point
+        if (cycle) {
             const self = this;
+            // move the next microtask onto the next macrotask queue
             return new Promise(resolve => {
                 setTimeout(function () {
                     resolve(self[key + "Async"].apply(self, args));
@@ -60,14 +59,14 @@ function register(key) {
             });
         }
 
-        //this.async = true;
         const res = this[key].apply(this, args),
               promise = res.then ? res : new Promise(resolve => resolve(res));
 
-        //this.async = false;
+
         if (callback) {
             promise.then(callback);
         }
+
         return promise;
     };
 }
\ No newline at end of file
diff --git a/dist/module-debug/bundle.js b/dist/module-debug/bundle.js
index 6767c99..2f49e72 100644
--- a/dist/module-debug/bundle.js
+++ b/dist/module-debug/bundle.js
@@ -186,6 +186,7 @@ import Charset from "./charset.js";
 /** @export */DocumentDescriptor.index;
 /** @export */DocumentDescriptor.tag;
 /** @export */DocumentDescriptor.store;
+/** @export */DocumentDescriptor.id;
 
 /** @export */TagOptions.field;
 /** @export */TagOptions.tag;
diff --git a/dist/module-debug/compress.js b/dist/module-debug/compress.js
index 8efa91a..7da6af0 100644
--- a/dist/module-debug/compress.js
+++ b/dist/module-debug/compress.js
@@ -32,7 +32,7 @@ export default function (str) {
             return cache.get(str);
         }
     } else {
-        timer = setTimeout(clear);
+        timer = setTimeout(clear, 1);
     }
 
     /* 2 ** ((level + 1.5) * 1.6 | 0) */
diff --git a/dist/module-debug/db/indexeddb/index.js b/dist/module-debug/db/indexeddb/index.js
index 8472e50..8963b04 100644
--- a/dist/module-debug/db/indexeddb/index.js
+++ b/dist/module-debug/db/indexeddb/index.js
@@ -296,7 +296,8 @@ IdxDB.prototype.transaction = function (ref, modifier, task) {
             //db.close;
         };
         const promise = task.call(this, store);
-        //
+        // transactions can just be used within the same event loop
+        // the indexeddb is such a stupid tool :(
         this.trx[ref + ":" + modifier] = null;
         return promise;
     });
diff --git a/dist/module-debug/document.js b/dist/module-debug/document.js
index 0afdec6..d465b76 100644
--- a/dist/module-debug/document.js
+++ b/dist/module-debug/document.js
@@ -55,6 +55,8 @@ export default function Document(options) {
 
     this.worker = options.worker;
 
+    this.priority = options.priority || 4;
+
     // if(SUPPORT_ASYNC){
     //     // this switch is used by recall of promise callbacks
     //     this.async = false;
@@ -124,6 +126,8 @@ export default function Document(options) {
     } else {
         if (options.db) {
             this.fastupdate = !1;
+            // think about to return the promise here
+            // actually it can be awaited on "await index.db"
             this.mount(options.db);
         }
     }
diff --git a/dist/module-debug/index.js b/dist/module-debug/index.js
index 2ececbb..afb61ff 100644
--- a/dist/module-debug/index.js
+++ b/dist/module-debug/index.js
@@ -109,7 +109,7 @@ export function autoCommit(self, replace, append) {
         self.commit_timer = setTimeout(function () {
             self.commit_timer = null;
             self.db.commit(self, replace, append);
-        }, 0);
+        }, 1);
     }
 }
 
diff --git a/dist/module-debug/serialize.js b/dist/module-debug/serialize.js
index 54b09ca..83482ed 100644
--- a/dist/module-debug/serialize.js
+++ b/dist/module-debug/serialize.js
@@ -288,23 +288,23 @@ export function exportDocument(callback, _field, _index_doc = 0, _index_obj = 0)
             case 1:
 
                 key = "tag";
-                chunk = ctx_to_json(this.tag, this.reg.size);
+                chunk = this.tag && ctx_to_json(this.tag, this.reg.size);
                 _field = null;
                 break;
 
             case 2:
 
                 key = "doc";
-                chunk = map_to_json(this.store);
+                chunk = this.store && map_to_json(this.store);
                 _field = null;
                 break;
 
-            case 3:
-
-                key = "cfg";
-                chunk = null;
-                _field = null;
-                break;
+            // case 3:
+            //
+            //     key = "cfg";
+            //     chunk = null;
+            //     _field = null;
+            //     break;
 
             default:
 
diff --git a/dist/module-debug/type.js b/dist/module-debug/type.js
index e32479f..da6a70e 100644
--- a/dist/module-debug/type.js
+++ b/dist/module-debug/type.js
@@ -44,6 +44,7 @@ export let IndexOptions = {};
  *   db: (StorageInterface|undefined),
  *   commit: (boolean|undefined),
  *   config: (string|undefined),
+ *   priority: (number|undefined),
  *   field: (string|undefined),
  *   filter: (Function|undefined),
  *   custom: (Function|undefined)
diff --git a/dist/module-debug/worker.js b/dist/module-debug/worker.js
index 1efa946..332abbf 100644
--- a/dist/module-debug/worker.js
+++ b/dist/module-debug/worker.js
@@ -60,6 +60,7 @@ export default function WorkerIndex(options = /** @type IndexOptions */{}) {
 
                 _self.resolver[++pid] = function () {
                     resolve(_self);
+                    if (1e9 < pid) pid = 0;
                 };
 
                 _self.worker.postMessage({
@@ -77,6 +78,9 @@ export default function WorkerIndex(options = /** @type IndexOptions */{}) {
             options: options
         });
 
+        this.priority = options.priority || 4;
+
+
         return this;
     }
 
diff --git a/dist/module-min/async.js b/dist/module-min/async.js
index ca8a04b..1717b4f 100644
--- a/dist/module-min/async.js
+++ b/dist/module-min/async.js
@@ -1 +1 @@
-import Document from"./document.js";import Index from"./index.js";import WorkerIndex from"./worker.js";export default function(a){register.call(a,"add"),register.call(a,"append"),register.call(a,"search"),register.call(a,"update"),register.call(a,"remove")}let timer,timestamp;const current={},limit={};function tick(a){timer=0,current[a]=limit[a]}function register(a){this[a+"Async"]=function(){const b=arguments,c=b[b.length-1];let d;if("function"==typeof c&&(d=c,delete b[b.length-1]),timer||(timer=setTimeout(tick,0,a),timestamp=Date.now()),limit[a]||(limit[a]=current[a]=1000),! --current[a]){const c=Date.now(),d=c-timestamp,e=3*(this.priority*this.priority);current[a]=limit[a]=0|limit[a]*e/d||1,timer=clearTimeout(timer);const f=this;return new Promise(c=>{setTimeout(function(){c(f[a+"Async"].apply(f,b))},0)})}const e=this[a].apply(this,b),f=e.then?e:new Promise(a=>a(e));return d&&f.then(d),f}}
\ No newline at end of file
+import Document from"./document.js";import Index from"./index.js";import WorkerIndex from"./worker.js";export default function(a){register.call(a,"add"),register.call(a,"append"),register.call(a,"search"),register.call(a,"update"),register.call(a,"remove")}let timer,timestamp,cycle;function tick(){timer=cycle=0}function register(a){this[a+"Async"]=function(){const b=arguments,c=b[b.length-1];let d;if("function"==typeof c&&(d=c,delete b[b.length-1]),!timer)timer=setTimeout(tick,0),timestamp=Date.now();else if(!cycle){const a=Date.now(),b=a-timestamp,c=3*(this.priority*this.priority);cycle=b>=c}if(cycle){const c=this;return new Promise(d=>{setTimeout(function(){d(c[a+"Async"].apply(c,b))},0)})}const e=this[a].apply(this,b),f=e.then?e:new Promise(a=>a(e));return d&&f.then(d),f}}
\ No newline at end of file
diff --git a/dist/module-min/bundle.js b/dist/module-min/bundle.js
index b12c4b3..0b1671d 100644
--- a/dist/module-min/bundle.js
+++ b/dist/module-min/bundle.js
@@ -1 +1 @@
-import{SearchOptions,ContextOptions,DocumentDescriptor,DocumentSearchOptions,FieldOptions,IndexOptions,DocumentOptions,TagOptions,StoreOptions,EncoderOptions,EncoderSplitOptions,PersistentOptions,ResolverOptions}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,Encoder.prototype.assign,Encoder.prototype.encode,Encoder.prototype.addMatcher,Encoder.prototype.addStemmer,Encoder.prototype.addFilter,Encoder.prototype.addMapper,Encoder.prototype.addReplacer,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,Document.prototype.field,Document.prototype.index,Document.prototype.reg,Document.prototype.tag,Document.prototype.store,Document.prototype.fastupdate,Resolver.prototype.limit,Resolver.prototype.offset,Resolver.prototype.boost,Resolver.prototype.resolve,Resolver.prototype.or,Resolver.prototype.and,Resolver.prototype.xor,Resolver.prototype.not,Resolver.prototype.result,StorageInterface.db,StorageInterface.id,StorageInterface.support_tag_search,StorageInterface.fastupdate,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.worker,IndexOptions.config,IndexOptions.priority,IndexOptions.export,IndexOptions.import,FieldOptions.preset,FieldOptions.context,FieldOptions.encoder,FieldOptions.encode,FieldOptions.resolution,FieldOptions.tokenize,FieldOptions.fastupdate,FieldOptions.score,FieldOptions.keystore,FieldOptions.rtl,FieldOptions.cache,FieldOptions.db,FieldOptions.config,FieldOptions.resolve,FieldOptions.field,FieldOptions.filter,FieldOptions.custom,FieldOptions.worker,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,DocumentOptions.priority,DocumentOptions.export,DocumentOptions.import,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,SearchOptions.resolution,DocumentSearchOptions.query,DocumentSearchOptions.limit,DocumentSearchOptions.offset,DocumentSearchOptions.context,DocumentSearchOptions.suggest,DocumentSearchOptions.enrich,DocumentSearchOptions.tag,DocumentSearchOptions.field,DocumentSearchOptions.index,DocumentSearchOptions.pluck,DocumentSearchOptions.merge,DocumentSearchOptions.highlight,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,ResolverOptions.index,ResolverOptions.query,ResolverOptions.limit,ResolverOptions.offset,ResolverOptions.enrich,ResolverOptions.resolve,ResolverOptions.suggest,ResolverOptions.and,ResolverOptions.or,ResolverOptions.xor,ResolverOptions.not;const FlexSearch={Index:Index,Charset:Charset,Encoder:Encoder,Document:Document,Worker:WorkerIndex,Resolver:Resolver,IndexedDB:IdxDB,Language:{}};{FlexSearch.Language={};const a="undefined"==typeof self?"undefined"==typeof global?"undefined"==typeof window?{}:window:global:self;let b;(b=a.define)&&b.amd?b([],function(){return FlexSearch}):"object"==typeof a.exports?a.exports=FlexSearch:a.FlexSearch=FlexSearch}export default FlexSearch;export{Index,Document,Encoder,Charset,WorkerIndex as Worker,Resolver,IdxDB as IndexedDB};
\ No newline at end of file
+import{SearchOptions,ContextOptions,DocumentDescriptor,DocumentSearchOptions,FieldOptions,IndexOptions,DocumentOptions,TagOptions,StoreOptions,EncoderOptions,EncoderSplitOptions,PersistentOptions,ResolverOptions}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,Encoder.prototype.assign,Encoder.prototype.encode,Encoder.prototype.addMatcher,Encoder.prototype.addStemmer,Encoder.prototype.addFilter,Encoder.prototype.addMapper,Encoder.prototype.addReplacer,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,Document.prototype.field,Document.prototype.index,Document.prototype.reg,Document.prototype.tag,Document.prototype.store,Document.prototype.fastupdate,Resolver.prototype.limit,Resolver.prototype.offset,Resolver.prototype.boost,Resolver.prototype.resolve,Resolver.prototype.or,Resolver.prototype.and,Resolver.prototype.xor,Resolver.prototype.not,Resolver.prototype.result,StorageInterface.db,StorageInterface.id,StorageInterface.support_tag_search,StorageInterface.fastupdate,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.worker,IndexOptions.config,IndexOptions.priority,IndexOptions.export,IndexOptions.import,FieldOptions.preset,FieldOptions.context,FieldOptions.encoder,FieldOptions.encode,FieldOptions.resolution,FieldOptions.tokenize,FieldOptions.fastupdate,FieldOptions.score,FieldOptions.keystore,FieldOptions.rtl,FieldOptions.cache,FieldOptions.db,FieldOptions.config,FieldOptions.resolve,FieldOptions.field,FieldOptions.filter,FieldOptions.custom,FieldOptions.worker,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,DocumentOptions.priority,DocumentOptions.export,DocumentOptions.import,ContextOptions.depth,ContextOptions.bidirectional,ContextOptions.resolution,DocumentDescriptor.field,DocumentDescriptor.index,DocumentDescriptor.tag,DocumentDescriptor.store,DocumentDescriptor.id,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,SearchOptions.resolution,DocumentSearchOptions.query,DocumentSearchOptions.limit,DocumentSearchOptions.offset,DocumentSearchOptions.context,DocumentSearchOptions.suggest,DocumentSearchOptions.enrich,DocumentSearchOptions.tag,DocumentSearchOptions.field,DocumentSearchOptions.index,DocumentSearchOptions.pluck,DocumentSearchOptions.merge,DocumentSearchOptions.highlight,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,ResolverOptions.index,ResolverOptions.query,ResolverOptions.limit,ResolverOptions.offset,ResolverOptions.enrich,ResolverOptions.resolve,ResolverOptions.suggest,ResolverOptions.and,ResolverOptions.or,ResolverOptions.xor,ResolverOptions.not;const FlexSearch={Index:Index,Charset:Charset,Encoder:Encoder,Document:Document,Worker:WorkerIndex,Resolver:Resolver,IndexedDB:IdxDB,Language:{}};{FlexSearch.Language={};const a="undefined"==typeof self?"undefined"==typeof global?"undefined"==typeof window?{}:window:global:self;let b;(b=a.define)&&b.amd?b([],function(){return FlexSearch}):"object"==typeof a.exports?a.exports=FlexSearch:a.FlexSearch=FlexSearch}export default FlexSearch;export{Index,Document,Encoder,Charset,WorkerIndex as Worker,Resolver,IdxDB as IndexedDB};
\ No newline at end of file
diff --git a/dist/module-min/compress.js b/dist/module-min/compress.js
index 0057655..c8adfbc 100644
--- a/dist/module-min/compress.js
+++ b/dist/module-min/compress.js
@@ -1 +1 @@
-let table,timer;const cache=new Map;function toRadix(a,b=255){if(!table){table=Array(b);for(let a=0;a<b;a++)table[a]=a+1;table=String.fromCharCode.apply(null,table)}let c,d=a,e="";for(;c=d%b,e=table.charAt(c)+e,d=0|d/b,!!d;);return e}export default function(a){if(!timer)timer=setTimeout(clear);else if(cache.has(a))return cache.get(a);const b=toRadix("number"==typeof a?a:lcg(a));return 2e5<cache.size&&cache.clear(),cache.set(a,b),b}function lcg(a){if("number"==typeof a)return a&4294967295;let b=0;for(let c=0;c<a.length;c++)b=(b*33^a.charCodeAt(c))&4294967295;return b+2147483648}function clear(){timer=null,cache.clear()}
\ No newline at end of file
+let table,timer;const cache=new Map;function toRadix(a,b=255){if(!table){table=Array(b);for(let a=0;a<b;a++)table[a]=a+1;table=String.fromCharCode.apply(null,table)}let c,d=a,e="";for(;c=d%b,e=table.charAt(c)+e,d=0|d/b,!!d;);return e}export default function(a){if(!timer)timer=setTimeout(clear,1);else if(cache.has(a))return cache.get(a);const b=toRadix("number"==typeof a?a:lcg(a));return 2e5<cache.size&&cache.clear(),cache.set(a,b),b}function lcg(a){if("number"==typeof a)return a&4294967295;let b=0;for(let c=0;c<a.length;c++)b=(b*33^a.charCodeAt(c))&4294967295;return b+2147483648}function clear(){timer=null,cache.clear()}
\ No newline at end of file
diff --git a/dist/module-min/document.js b/dist/module-min/document.js
index cd0528e..ddaf761 100644
--- a/dist/module-min/document.js
+++ b/dist/module-min/document.js
@@ -1 +1 @@
-import{IndexOptions,DocumentOptions,DocumentDescriptor,FieldOptions,StoreOptions}from"./type.js";import StorageInterface from"./db/interface.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||this.constructor!==Document)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||a.worker||a.db?d&&!0?new KeystoreSet(d):new Set:d&&!0?new KeystoreMap(d):new Map,this.storetree=(c=b.store||null)&&c&&!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){this.fastupdate=!1;const a=[];for(const b of this.index.values())b.then&&a.push(b);if(a.length){const b=this;return Promise.all(a).then(function(a){let c=0;for(const d of b.index.entries()){const e=d[0],f=d[1];f.then&&b.index.set(e,a[c++])}return b})}}else a.db&&(this.fastupdate=!1,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?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
+import{IndexOptions,DocumentOptions,DocumentDescriptor,FieldOptions,StoreOptions}from"./type.js";import StorageInterface from"./db/interface.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||this.constructor!==Document)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||a.worker||a.db?d&&!0?new KeystoreSet(d):new Set:d&&!0?new KeystoreMap(d):new Map,this.storetree=(c=b.store||null)&&c&&!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.priority=a.priority||4,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){this.fastupdate=!1;const a=[];for(const b of this.index.values())b.then&&a.push(b);if(a.length){const b=this;return Promise.all(a).then(function(a){let c=0;for(const d of b.index.entries()){const e=d[0],f=d[1];f.then&&b.index.set(e,a[c++])}return b})}}else a.db&&(this.fastupdate=!1,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?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 a04fedf..01053ec 100644
--- a/dist/module-min/index.js
+++ b/dist/module-min/index.js
@@ -1 +1 @@
-import{IndexOptions,ContextOptions,EncoderOptions}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||this.constructor!==Index)return new Index(a);!1,a=a?apply_preset(a):{};let c=a.context;const d=!0===c?{depth:1}:c||{},e=is_string(a.encoder)?Charset[a.encoder]:a.encode||a.encoder||default_encoder;this.encoder=e.encode?e:"object"==typeof e?new Encoder(e):{encode:e},this.compress=a.compress||a.compression||!1,this.resolution=a.resolution||9,this.tokenize=(c=a.tokenize)&&"default"!==c&&c||"strict",this.depth="strict"===c&&d.depth||0,this.bidirectional=!1!==d.bidirectional,this.fastupdate=!!a.fastupdate,this.score=a.score||null,c=a.keystore||0,c&&(this.keystore=c),this.map=c&&!0?new KeystoreMap(c):new Map,this.ctx=c&&!0?new KeystoreMap(c):new Map,this.reg=b||(this.fastupdate?c&&!0?new KeystoreMap(c):new Map:c&&!0?new KeystoreSet(c):new Set),this.resolution_ctx=d.resolution||3,this.rtl=e.rtl||a.rtl||!1,this.cache=(c=a.cache||null)&&new Cache(c),this.resolve=!1!==a.resolve,(c=a.db)&&(this.db=this.mount(c)),this.commit_auto=!1!==a.commit,this.commit_task=[],this.commit_timer=null,this.priority=a.priority||4}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,EncoderOptions}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||this.constructor!==Index)return new Index(a);!1,a=a?apply_preset(a):{};let c=a.context;const d=!0===c?{depth:1}:c||{},e=is_string(a.encoder)?Charset[a.encoder]:a.encode||a.encoder||default_encoder;this.encoder=e.encode?e:"object"==typeof e?new Encoder(e):{encode:e},this.compress=a.compress||a.compression||!1,this.resolution=a.resolution||9,this.tokenize=(c=a.tokenize)&&"default"!==c&&c||"strict",this.depth="strict"===c&&d.depth||0,this.bidirectional=!1!==d.bidirectional,this.fastupdate=!!a.fastupdate,this.score=a.score||null,c=a.keystore||0,c&&(this.keystore=c),this.map=c&&!0?new KeystoreMap(c):new Map,this.ctx=c&&!0?new KeystoreMap(c):new Map,this.reg=b||(this.fastupdate?c&&!0?new KeystoreMap(c):new Map:c&&!0?new KeystoreSet(c):new Set),this.resolution_ctx=d.resolution||3,this.rtl=e.rtl||a.rtl||!1,this.cache=(c=a.cache||null)&&new Cache(c),this.resolve=!1!==a.resolve,(c=a.db)&&(this.db=this.mount(c)),this.commit_auto=!1!==a.commit,this.commit_task=[],this.commit_timer=null,this.priority=a.priority||4}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)},1))}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/serialize.js b/dist/module-min/serialize.js
index 3a1b4ed..1af2083 100644
--- a/dist/module-min/serialize.js
+++ b/dist/module-min/serialize.js
@@ -1 +1 @@
-import Index from"./index.js";import Document from"./document.js";import{is_string}from"./common.js";import{IntermediateSearchResults}from"./type.js";const chunk_size_reg=250000,chunk_size_map=5000,chunk_size_ctx=1000;function map_to_json(a,b=0){let c=[],d=[];b&&(b=0|chunk_size_map*(chunk_size_reg/b));for(const e of a.entries())d.push(e),d.length===b&&(c.push(d),d=[]);return d.length&&c.push(d),c}function json_to_map(a,b){b||(b=new Map);for(let c,d=0;d<a.length;d++)c=a[d],b.set(c[0],c[1]);return b}function ctx_to_json(a,b=0){let c=[],d=[];b&&(b=0|chunk_size_ctx*(chunk_size_reg/b));for(const e of a.entries()){const a=e[0],f=e[1];d.push([a,map_to_json(f)[0]]),d.length===b&&(c.push(d),d=[])}return d.length&&c.push(d),c}function json_to_ctx(a,b){b||(b=new Map);for(let c,d,e=0;e<a.length;e++)c=a[e],d=b.get(c[0]),b.set(c[0],json_to_map(c[1],d));return b}function reg_to_json(a){let b=[],c=[];for(const d of a.keys())c.push(d),c.length===chunk_size_reg&&(b.push(c),c=[]);return c.length&&b.push(c),b}function json_to_reg(a,b){b||(b=new Set);for(let c=0;c<a.length;c++)b.add(a[c]);return b}function save(a,b,c,d,e,f,g=0){const h=d&&d.constructor===Array,i=h?d.shift():d;if(!i)return this.export(a,b,e,f+1);const j=a((b?b+".":"")+(g+1)+"."+c,JSON.stringify(i));if(j&&j.then){const i=this;return j.then(function(){return save.call(i,a,b,c,h?d:null,e,f,g+1)})}return save.call(this,a,b,c,h?d:null,e,f,g+1)}export function exportIndex(a,b,c=0,d=0){let e,f;switch(d){case 0:e="reg",f=reg_to_json(this.reg);break;case 1:e="cfg",f=null;break;case 2:e="map",f=map_to_json(this.map,this.reg.size);break;case 3:e="ctx",f=ctx_to_json(this.ctx,this.reg.size);break;default:return;}return save.call(this,a,b,e,f,c,d)}export function importIndex(a,b){if(b){"string"==typeof b&&(b=JSON.parse(b));const c=a.split(".");switch("json"===c[c.length-1]&&c.pop(),3===c.length&&c.shift(),a=1<c.length?c[1]:c[0],a){case"cfg":break;case"reg":this.fastupdate=!1,this.reg=json_to_reg(b,this.reg);break;case"map":this.map=json_to_map(b,this.map);break;case"ctx":this.ctx=json_to_ctx(b,this.ctx);}}}export function exportDocument(a,b,c=0,d=0){if(c<this.field.length){const b=this.field[c],e=this.index.get(b),f=e.export(a,b,c,d=1);if(f&&f.then){const d=this;return f.then(function(){return d.export(a,b,c+1)})}return this.export(a,b,c+1)}else{let e,f;switch(d){case 0:e="reg",f=reg_to_json(this.reg),b=null;break;case 1:e="tag",f=ctx_to_json(this.tag,this.reg.size),b=null;break;case 2:e="doc",f=map_to_json(this.store),b=null;break;case 3:e="cfg",f=null,b=null;break;default:return;}return save.call(this,a,b,e,f,c,d)}}export function importDocument(a,b){const c=a.split(".");"json"===c[c.length-1]&&c.pop();const d=2<c.length?c[0]:"",e=2<c.length?c[2]:c[1];if(this.worker&&d)return this.index.get(d).import(a);if(b)if("string"==typeof b&&(b=JSON.parse(b)),!d)switch(e){case"reg":this.fastupdate=!1,this.reg=json_to_reg(b,this.reg);for(let a,b=0;b<this.field.length;b++)a=this.index.get(this.field[b]),a.fastupdate=!1,a.reg=this.reg;if(this.worker){const b=[],c=this;for(const c of this.index.values())b.push(c.import(a));return Promise.all(b)}break;case"tag":this.tag=json_to_ctx(b,this.tag);break;case"doc":this.store=json_to_map(b,this.store);break;case"cfg":}else return this.index.get(d).import(e,b)}export function serialize(a=!0){if(!this.reg.size)return"";let b="",c="";for(const d of this.reg.keys())c||(c=typeof d),b+=(b?",":"")+("string"==c?"\""+d+"\"":d);b="index.reg=new Set(["+b+"]);";let d="";for(const b of this.map.entries()){const a=b[0],e=b[1];let f="";for(let a,b=0;b<e.length;b++){a=e[b]||[""];let d="";for(let b=0;b<a.length;b++)d+=(d?",":"")+("string"==c?"\""+a[b]+"\"":a[b]);d="["+d+"]",f+=(f?",":"")+d}f="[\""+a+"\",["+f+"]]",d+=(d?",":"")+f}d="index.map=new Map(["+d+"]);";let e="";for(const b of this.ctx.entries()){const a=b[0],d=b[1];for(const b of d.entries()){const d=b[0],f=b[1];let g="";for(let a,b=0;b<f.length;b++){a=f[b]||[""];let d="";for(let b=0;b<a.length;b++)d+=(d?",":"")+("string"==c?"\""+a[b]+"\"":a[b]);d="["+d+"]",g+=(g?",":"")+d}g="new Map([[\""+d+"\",["+g+"]]])",g="[\""+a+"\","+g+"]",e+=(e?",":"")+g}}return e="index.ctx=new Map(["+e+"]);",a?"function inject(index){"+b+d+e+"}":b+d+e}
\ No newline at end of file
+import Index from"./index.js";import Document from"./document.js";import{is_string}from"./common.js";import{IntermediateSearchResults}from"./type.js";const chunk_size_reg=250000,chunk_size_map=5000,chunk_size_ctx=1000;function map_to_json(a,b=0){let c=[],d=[];b&&(b=0|chunk_size_map*(chunk_size_reg/b));for(const e of a.entries())d.push(e),d.length===b&&(c.push(d),d=[]);return d.length&&c.push(d),c}function json_to_map(a,b){b||(b=new Map);for(let c,d=0;d<a.length;d++)c=a[d],b.set(c[0],c[1]);return b}function ctx_to_json(a,b=0){let c=[],d=[];b&&(b=0|chunk_size_ctx*(chunk_size_reg/b));for(const e of a.entries()){const a=e[0],f=e[1];d.push([a,map_to_json(f)[0]]),d.length===b&&(c.push(d),d=[])}return d.length&&c.push(d),c}function json_to_ctx(a,b){b||(b=new Map);for(let c,d,e=0;e<a.length;e++)c=a[e],d=b.get(c[0]),b.set(c[0],json_to_map(c[1],d));return b}function reg_to_json(a){let b=[],c=[];for(const d of a.keys())c.push(d),c.length===chunk_size_reg&&(b.push(c),c=[]);return c.length&&b.push(c),b}function json_to_reg(a,b){b||(b=new Set);for(let c=0;c<a.length;c++)b.add(a[c]);return b}function save(a,b,c,d,e,f,g=0){const h=d&&d.constructor===Array,i=h?d.shift():d;if(!i)return this.export(a,b,e,f+1);const j=a((b?b+".":"")+(g+1)+"."+c,JSON.stringify(i));if(j&&j.then){const i=this;return j.then(function(){return save.call(i,a,b,c,h?d:null,e,f,g+1)})}return save.call(this,a,b,c,h?d:null,e,f,g+1)}export function exportIndex(a,b,c=0,d=0){let e,f;switch(d){case 0:e="reg",f=reg_to_json(this.reg);break;case 1:e="cfg",f=null;break;case 2:e="map",f=map_to_json(this.map,this.reg.size);break;case 3:e="ctx",f=ctx_to_json(this.ctx,this.reg.size);break;default:return;}return save.call(this,a,b,e,f,c,d)}export function importIndex(a,b){if(b){"string"==typeof b&&(b=JSON.parse(b));const c=a.split(".");switch("json"===c[c.length-1]&&c.pop(),3===c.length&&c.shift(),a=1<c.length?c[1]:c[0],a){case"cfg":break;case"reg":this.fastupdate=!1,this.reg=json_to_reg(b,this.reg);break;case"map":this.map=json_to_map(b,this.map);break;case"ctx":this.ctx=json_to_ctx(b,this.ctx);}}}export function exportDocument(a,b,c=0,d=0){if(c<this.field.length){const b=this.field[c],e=this.index.get(b),f=e.export(a,b,c,d=1);if(f&&f.then){const d=this;return f.then(function(){return d.export(a,b,c+1)})}return this.export(a,b,c+1)}else{let e,f;switch(d){case 0:e="reg",f=reg_to_json(this.reg),b=null;break;case 1:e="tag",f=this.tag&&ctx_to_json(this.tag,this.reg.size),b=null;break;case 2:e="doc",f=this.store&&map_to_json(this.store),b=null;break;default:return;}return save.call(this,a,b,e,f,c,d)}}export function importDocument(a,b){const c=a.split(".");"json"===c[c.length-1]&&c.pop();const d=2<c.length?c[0]:"",e=2<c.length?c[2]:c[1];if(this.worker&&d)return this.index.get(d).import(a);if(b)if("string"==typeof b&&(b=JSON.parse(b)),!d)switch(e){case"reg":this.fastupdate=!1,this.reg=json_to_reg(b,this.reg);for(let a,b=0;b<this.field.length;b++)a=this.index.get(this.field[b]),a.fastupdate=!1,a.reg=this.reg;if(this.worker){const b=[],c=this;for(const c of this.index.values())b.push(c.import(a));return Promise.all(b)}break;case"tag":this.tag=json_to_ctx(b,this.tag);break;case"doc":this.store=json_to_map(b,this.store);break;case"cfg":}else return this.index.get(d).import(e,b)}export function serialize(a=!0){if(!this.reg.size)return"";let b="",c="";for(const d of this.reg.keys())c||(c=typeof d),b+=(b?",":"")+("string"==c?"\""+d+"\"":d);b="index.reg=new Set(["+b+"]);";let d="";for(const b of this.map.entries()){const a=b[0],e=b[1];let f="";for(let a,b=0;b<e.length;b++){a=e[b]||[""];let d="";for(let b=0;b<a.length;b++)d+=(d?",":"")+("string"==c?"\""+a[b]+"\"":a[b]);d="["+d+"]",f+=(f?",":"")+d}f="[\""+a+"\",["+f+"]]",d+=(d?",":"")+f}d="index.map=new Map(["+d+"]);";let e="";for(const b of this.ctx.entries()){const a=b[0],d=b[1];for(const b of d.entries()){const d=b[0],f=b[1];let g="";for(let a,b=0;b<f.length;b++){a=f[b]||[""];let d="";for(let b=0;b<a.length;b++)d+=(d?",":"")+("string"==c?"\""+a[b]+"\"":a[b]);d="["+d+"]",g+=(g?",":"")+d}g="new Map([[\""+d+"\",["+g+"]]])",g="[\""+a+"\","+g+"]",e+=(e?",":"")+g}}return e="index.ctx=new Map(["+e+"]);",a?"function inject(index){"+b+d+e+"}":b+d+e}
\ No newline at end of file
diff --git a/dist/module-min/worker.js b/dist/module-min/worker.js
index 8f337dd..e36f9a9 100644
--- a/dist/module-min/worker.js
+++ b/dist/module-min/worker.js
@@ -1 +1 @@
-import{IndexOptions}from"./type.js";import{create_object}from"./common.js";import handler from"./worker/handler.js";import apply_async from"./async.js";let pid=0;export default function WorkerIndex(a={}){function b(b){function f(a){a=a.data||a;const b=a.id,c=b&&e.resolver[b];c&&(c(a.msg),delete e.resolver[b])}if(this.worker=b,this.resolver=create_object(),!!this.worker)return(d?this.worker.on("message",f):this.worker.onmessage=f,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)}if(!this||this.constructor!==WorkerIndex)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,f=create(c,d,a.worker);return f.then?f.then(function(a){return b.call(e,a)}):b.call(this,f)}register("add"),register("append"),register("search"),register("update"),register("remove"),register("clear"),register("export"),register("import"),apply_async(WorkerIndex.prototype);function register(a){WorkerIndex.prototype[a]=function(){const b=this,c=[].slice.call(arguments),d=c[c.length-1];let e;"function"==typeof d&&(e=d,c.pop());const f=new Promise(function(d){"export"===a&&"function"==typeof c[0]&&(c[0]=null),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("string"==typeof c?c:(1,eval)("import.meta.url").replace("/worker.js","/worker/worker.js").replace("flexsearch.bundle.module.min.js","module/worker/worker.js"),{type:"module"}),d}
\ No newline at end of file
+import{IndexOptions}from"./type.js";import{create_object}from"./common.js";import handler from"./worker/handler.js";import apply_async from"./async.js";let pid=0;export default function WorkerIndex(a={}){function b(b){function f(a){a=a.data||a;const b=a.id,c=b&&e.resolver[b];c&&(c(a.msg),delete e.resolver[b])}if(this.worker=b,this.resolver=create_object(),!!this.worker)return(d?this.worker.on("message",f):this.worker.onmessage=f,a.config)?new Promise(function(b){e.resolver[++pid]=function(){b(e),1e9<pid&&(pid=0)},e.worker.postMessage({id:pid,task:"init",factory:c,options:a})}):(this.worker.postMessage({task:"init",factory:c,options:a}),this.priority=a.priority||4,this)}if(!this||this.constructor!==WorkerIndex)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,f=create(c,d,a.worker);return f.then?f.then(function(a){return b.call(e,a)}):b.call(this,f)}register("add"),register("append"),register("search"),register("update"),register("remove"),register("clear"),register("export"),register("import"),apply_async(WorkerIndex.prototype);function register(a){WorkerIndex.prototype[a]=function(){const b=this,c=[].slice.call(arguments),d=c[c.length-1];let e;"function"==typeof d&&(e=d,c.pop());const f=new Promise(function(d){"export"===a&&"function"==typeof c[0]&&(c[0]=null),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("string"==typeof c?c:(1,eval)("import.meta.url").replace("/worker.js","/worker/worker.js").replace("flexsearch.bundle.module.min.js","module/worker/worker.js"),{type:"module"}),d}
\ No newline at end of file
diff --git a/dist/module/async.js b/dist/module/async.js
index 1b5ac54..88fdcec 100644
--- a/dist/module/async.js
+++ b/dist/module/async.js
@@ -10,14 +10,11 @@ export default function (prototype) {
     register.call(prototype, "remove");
 }
 
-let timer, timestamp;
-const current = {},
-      limit = {};
+let timer, timestamp, cycle;
 
 
-function tick(key) {
-    timer = 0;
-    current[key] = limit[key];
+function tick() {
+    timer = cycle = 0;
 }
 
 /**
@@ -37,22 +34,24 @@ function register(key) {
             delete args[args.length - 1];
         }
 
-        // balance when polling the event loop
+        // event loop runtime balancer
         if (!timer) {
-            timer = setTimeout(tick, 0, key);
+            // when the next event loop occurs earlier than task completion
+            // it will reset the state immediately
+            timer = setTimeout(tick, 0);
             timestamp = Date.now();
-        }
-        if (!limit[key]) {
-            limit[key] = current[key] = 1000;
-        }
-        if (! --current[key]) {
+        } else if (!cycle) {
             const now = Date.now(),
                   duration = now - timestamp,
                   target = 3 * (this.priority * this.priority);
 
-            current[key] = limit[key] = 0 | limit[key] * target / duration || 1;
-            timer = clearTimeout(timer);
+            cycle = duration >= target;
+        }
+
+        // cycle all instances from this point
+        if (cycle) {
             const self = this;
+            // move the next microtask onto the next macrotask queue
             return new Promise(resolve => {
                 setTimeout(function () {
                     resolve(self[key + "Async"].apply(self, args));
@@ -60,14 +59,14 @@ function register(key) {
             });
         }
 
-        //this.async = true;
         const res = this[key].apply(this, args),
               promise = res.then ? res : new Promise(resolve => resolve(res));
 
-        //this.async = false;
+
         if (callback) {
             promise.then(callback);
         }
+
         return promise;
     };
 }
\ No newline at end of file
diff --git a/dist/module/bundle.js b/dist/module/bundle.js
index 6767c99..2f49e72 100644
--- a/dist/module/bundle.js
+++ b/dist/module/bundle.js
@@ -186,6 +186,7 @@ import Charset from "./charset.js";
 /** @export */DocumentDescriptor.index;
 /** @export */DocumentDescriptor.tag;
 /** @export */DocumentDescriptor.store;
+/** @export */DocumentDescriptor.id;
 
 /** @export */TagOptions.field;
 /** @export */TagOptions.tag;
diff --git a/dist/module/compress.js b/dist/module/compress.js
index 8efa91a..7da6af0 100644
--- a/dist/module/compress.js
+++ b/dist/module/compress.js
@@ -32,7 +32,7 @@ export default function (str) {
             return cache.get(str);
         }
     } else {
-        timer = setTimeout(clear);
+        timer = setTimeout(clear, 1);
     }
 
     /* 2 ** ((level + 1.5) * 1.6 | 0) */
diff --git a/dist/module/db/indexeddb/index.js b/dist/module/db/indexeddb/index.js
index 8472e50..8963b04 100644
--- a/dist/module/db/indexeddb/index.js
+++ b/dist/module/db/indexeddb/index.js
@@ -296,7 +296,8 @@ IdxDB.prototype.transaction = function (ref, modifier, task) {
             //db.close;
         };
         const promise = task.call(this, store);
-        //
+        // transactions can just be used within the same event loop
+        // the indexeddb is such a stupid tool :(
         this.trx[ref + ":" + modifier] = null;
         return promise;
     });
diff --git a/dist/module/document.js b/dist/module/document.js
index 4248511..7cf3324 100644
--- a/dist/module/document.js
+++ b/dist/module/document.js
@@ -55,6 +55,8 @@ export default function Document(options) {
 
     this.worker = options.worker;
 
+    this.priority = options.priority || 4;
+
     // if(SUPPORT_ASYNC){
     //     // this switch is used by recall of promise callbacks
     //     this.async = false;
@@ -124,6 +126,8 @@ export default function Document(options) {
     } else {
         if (options.db) {
             this.fastupdate = !1;
+            // think about to return the promise here
+            // actually it can be awaited on "await index.db"
             this.mount(options.db);
         }
     }
diff --git a/dist/module/index.js b/dist/module/index.js
index 76e715e..caa4743 100644
--- a/dist/module/index.js
+++ b/dist/module/index.js
@@ -109,7 +109,7 @@ export function autoCommit(self, replace, append) {
         self.commit_timer = setTimeout(function () {
             self.commit_timer = null;
             self.db.commit(self, replace, append);
-        }, 0);
+        }, 1);
     }
 }
 
diff --git a/dist/module/serialize.js b/dist/module/serialize.js
index 54b09ca..83482ed 100644
--- a/dist/module/serialize.js
+++ b/dist/module/serialize.js
@@ -288,23 +288,23 @@ export function exportDocument(callback, _field, _index_doc = 0, _index_obj = 0)
             case 1:
 
                 key = "tag";
-                chunk = ctx_to_json(this.tag, this.reg.size);
+                chunk = this.tag && ctx_to_json(this.tag, this.reg.size);
                 _field = null;
                 break;
 
             case 2:
 
                 key = "doc";
-                chunk = map_to_json(this.store);
+                chunk = this.store && map_to_json(this.store);
                 _field = null;
                 break;
 
-            case 3:
-
-                key = "cfg";
-                chunk = null;
-                _field = null;
-                break;
+            // case 3:
+            //
+            //     key = "cfg";
+            //     chunk = null;
+            //     _field = null;
+            //     break;
 
             default:
 
diff --git a/dist/module/type.js b/dist/module/type.js
index e32479f..da6a70e 100644
--- a/dist/module/type.js
+++ b/dist/module/type.js
@@ -44,6 +44,7 @@ export let IndexOptions = {};
  *   db: (StorageInterface|undefined),
  *   commit: (boolean|undefined),
  *   config: (string|undefined),
+ *   priority: (number|undefined),
  *   field: (string|undefined),
  *   filter: (Function|undefined),
  *   custom: (Function|undefined)
diff --git a/dist/module/worker.js b/dist/module/worker.js
index 1efa946..332abbf 100644
--- a/dist/module/worker.js
+++ b/dist/module/worker.js
@@ -60,6 +60,7 @@ export default function WorkerIndex(options = /** @type IndexOptions */{}) {
 
                 _self.resolver[++pid] = function () {
                     resolve(_self);
+                    if (1e9 < pid) pid = 0;
                 };
 
                 _self.worker.postMessage({
@@ -77,6 +78,9 @@ export default function WorkerIndex(options = /** @type IndexOptions */{}) {
             options: options
         });
 
+        this.priority = options.priority || 4;
+
+
         return this;
     }
 
diff --git a/doc/async.md b/doc/async.md
new file mode 100644
index 0000000..ea07443
--- /dev/null
+++ b/doc/async.md
@@ -0,0 +1,39 @@
+## Asynchronous Runtime Balancer
+
+> The async processing model is automatically observed by a runtime balancer to prevent any blocking issues, even on page load.
+
+The most methods of each index type provides an async version, e.g.:
+
+- addAsync()
+- updateAsync()
+- removeAsync()
+- searchAsync()
+
+All those async versions always return a `Promise`, although a callback can be passed additionally as the <u>last parameter</u>.
+
+When calling async methods of the index, a runtime balancer observe the current event loop and will pass to the next event loop automatically.
+
+You can control how early the process should move over to the next event loop by passing the option property `priority`:
+
+```js
+const index = new Index({
+    // a value between 1 and 9
+    priority: 4
+});
+```
+
+The lowest valid priority number is `1` and is typically known as `idle` (event loop cycles by native ~4ms). The default priority is `4` which is optimized for non-blocking user interfaces within a browser (event loop cycles every ~40ms).
+When you have some very smooth running animation you should use a priority of `2` to keep the animation running by 60 fps without any stutter. Targeting 120 fps or higher you should use `1`.
+
+On Node.js you can slightly increase this priority e.g. to `6`, because here there is no UI involved. 
+A priority value of `9` will cycle the event loop on every ~500ms which is the maximum recommended blocking time. You should not use a value higher than this.
+
+Do not forget to `await` on <u>every</u> async task you apply to the index:
+
+```js
+for(let i = 0; i < 99999999; i++){
+    await index.addAsync(i, "test " + i);
+}
+```
+
+You can perform queries to the index during any other async batch is running.
\ No newline at end of file
diff --git a/example/browser-module/document-worker-extern-config/index.html b/example/browser-module/document-worker-extern-config/index.html
index bc5d3ae..4aa780a 100644
--- a/example/browser-module/document-worker-extern-config/index.html
+++ b/example/browser-module/document-worker-extern-config/index.html
@@ -8,7 +8,7 @@
 <body style="white-space: pre">
 <script type="module">
 
-  // you can't load from CDN because of Same-Origin-Policy
+  // you can't load from CDN because of worker Same-Origin-Policy
   import { Document } from "../../../dist/flexsearch.bundle.module.min.js";
   const dirname = import.meta.url.replace("/index.html", "");
 
diff --git a/package-lock.json b/package-lock.json
index 030ac76..d161da6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "flexsearch",
-  "version": "0.8.115",
+  "version": "0.8.117",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "flexsearch",
-      "version": "0.8.115",
+      "version": "0.8.117",
       "funding": [
         {
           "type": "github",
diff --git a/package.json b/package.json
index fd0005a..1ca426a 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "public": true,
   "preferGlobal": false,
   "name": "flexsearch",
-  "version": "0.8.115",
+  "version": "0.8.117",
   "description": "Next-Generation full-text search library for Browser and Node.js",
   "homepage": "https://github.com/nextapps-de/flexsearch/",
   "author": "Thomas Wilkerling",
diff --git a/src/async.js b/src/async.js
index af366e3..fa2b7b3 100644
--- a/src/async.js
+++ b/src/async.js
@@ -12,12 +12,10 @@ export default function(prototype){
 
 let timer;
 let timestamp;
-const current = {};
-const limit = {};
+let cycle;
 
-function tick(key){
-    timer = 0;
-    current[key] = limit[key];
+function tick(){
+    timer = cycle = 0;
 }
 
 /**
@@ -37,35 +35,38 @@ function register(key){
             delete args[args.length - 1];
         }
 
-        // balance when polling the event loop
+        // event loop runtime balancer
         if(!timer){
-            timer = setTimeout(tick, 0, key);
+            // when the next event loop occurs earlier than task completion
+            // it will reset the state immediately
+            timer = setTimeout(tick, 0);
             timestamp = Date.now();
         }
-        if(!limit[key]){
-            limit[key] = current[key] = 1000;
-        }
-        if(!--current[key]){
+        else if(!cycle){
             const now = Date.now();
             const duration = now - timestamp;
             const target = this.priority * this.priority * 3;
-            current[key] = limit[key] = (limit[key] * target / duration | 0) || 1;
-            timer = clearTimeout(timer);
+            cycle = duration >= target;
+        }
+
+        // cycle all instances from this point
+        if(cycle){
             const self = this;
+            // move the next microtask onto the next macrotask queue
             return new Promise(resolve => {
                 setTimeout(function(){
                     resolve(self[key + "Async"].apply(self, args));
-                }, 0)
-            })
+                }, 0);
+            });
         }
 
-        //this.async = true;
         const res = this[key].apply(this, args);
         const promise = res.then ? res : new Promise(resolve => resolve(res));
-        //this.async = false;
+
         if(callback){
             promise.then(callback);
         }
+
         return promise;
     };
 }
diff --git a/src/bundle.js b/src/bundle.js
index 79385b9..309ff06 100644
--- a/src/bundle.js
+++ b/src/bundle.js
@@ -217,6 +217,7 @@ if(SUPPORT_SERIALIZE){
 /** @export */ DocumentDescriptor.index;
 /** @export */ DocumentDescriptor.tag;
 /** @export */ DocumentDescriptor.store;
+/** @export */ DocumentDescriptor.id;
 
 /** @export */ TagOptions.field;
 /** @export */ TagOptions.tag;
diff --git a/src/compress.js b/src/compress.js
index 37fb20f..f35372e 100644
--- a/src/compress.js
+++ b/src/compress.js
@@ -39,7 +39,7 @@ export default function(str){
             }
         }
         else{
-            timer = setTimeout(clear);
+            timer = setTimeout(clear, 1);
         }
     }
 
diff --git a/src/document.js b/src/document.js
index dc5335a..c12ebf3 100644
--- a/src/document.js
+++ b/src/document.js
@@ -83,6 +83,10 @@ export default function Document(options){
         this.worker = options.worker;
     }
 
+    if(SUPPORT_ASYNC){
+        this.priority = options.priority || 4;
+    }
+
     // if(SUPPORT_ASYNC){
     //     // this switch is used by recall of promise callbacks
     //     this.async = false;
@@ -155,6 +159,8 @@ export default function Document(options){
     else if(SUPPORT_PERSISTENT){
         if(options.db){
             this.fastupdate = false;
+            // think about to return the promise here
+            // actually it can be awaited on "await index.db"
             this.mount(options.db);
         }
     }
diff --git a/src/index.js b/src/index.js
index 1ba41e6..f2645c0 100644
--- a/src/index.js
+++ b/src/index.js
@@ -159,7 +159,7 @@ export function autoCommit(self, replace, append){
         self.commit_timer = setTimeout(function(){
             self.commit_timer = null;
             self.db.commit(self, replace, append);
-        }, 0);
+        }, 1);
     }
 }
 
diff --git a/src/serialize.js b/src/serialize.js
index 172f665..69bbb4e 100644
--- a/src/serialize.js
+++ b/src/serialize.js
@@ -1,5 +1,5 @@
 // COMPILER BLOCK -->
-import { SUPPORT_WORKER } from "./config.js";
+import { SUPPORT_STORE, SUPPORT_TAGS, SUPPORT_WORKER } from "./config.js";
 // <-- COMPILER BLOCK
 import Index from "./index.js";
 import Document from "./document.js";
@@ -316,26 +316,26 @@ export function exportDocument(callback, _field, _index_doc = 0, _index_obj = 0)
                 _field = null;
                 break;
 
-            case 1:
+            case SUPPORT_TAGS && 1:
 
                 key = "tag";
-                chunk = ctx_to_json(this.tag, this.reg.size);
+                chunk = this.tag && ctx_to_json(this.tag, this.reg.size);
                 _field = null;
                 break;
 
-            case 2:
+            case SUPPORT_STORE && 2:
 
                 key = "doc";
-                chunk = map_to_json(this.store);
+                chunk = this.store && map_to_json(this.store);
                 _field = null;
                 break;
 
-            case 3:
-
-                key = "cfg";
-                chunk = null;
-                _field = null;
-                break;
+            // case 3:
+            //
+            //     key = "cfg";
+            //     chunk = null;
+            //     _field = null;
+            //     break;
 
             default:
 
diff --git a/src/type.js b/src/type.js
index 3816e96..5a7c8d2 100644
--- a/src/type.js
+++ b/src/type.js
@@ -44,6 +44,7 @@ export let IndexOptions = {};
  *   db: (StorageInterface|undefined),
  *   commit: (boolean|undefined),
  *   config: (string|undefined),
+ *   priority: (number|undefined),
  *   field: (string|undefined),
  *   filter: (Function|undefined),
  *   custom: (Function|undefined)
diff --git a/src/worker.js b/src/worker.js
index 230f5d3..1ce926b 100644
--- a/src/worker.js
+++ b/src/worker.js
@@ -67,6 +67,7 @@ export default function WorkerIndex(options = /** @type IndexOptions */ ({})){
 
                 _self.resolver[++pid] = function(){
                     resolve(_self);
+                    if(pid > 1e9) pid = 0;
                 };
 
                 _self.worker.postMessage({
@@ -84,6 +85,10 @@ export default function WorkerIndex(options = /** @type IndexOptions */ ({})){
             "options": options
         });
 
+        if(SUPPORT_ASYNC){
+            this.priority = options.priority || 4;
+        }
+
         return this;
     }