diff --git a/README.md b/README.md
index e5684a2..c1170c7 100644
--- a/README.md
+++ b/README.md
@@ -29,6 +29,7 @@ npm install git+https://github.com/nextapps-de/flexsearch/tree/v0.8-preview
 - Enhanced Worker Support
 - Improved Build System + Bundler (Supported: CommonJS, ESM, Global Namespace), also the import of language packs are now supported for Node.js
 - Full covering index.d.ts type definitions
+- Fast-Boot Serialization optimized for Server-Side-Rendering (PHP, Python, Ruby, Rust, Java, Go, Node.js, ...)
 
 Compare Benchmark: [0.7.0](https://nextapps-de.github.io/flexsearch/test/flexsearch-0.7.0/) vs. [0.8.0](https://nextapps-de.github.io/flexsearch/test/flexsearch-0.8.0/)
 
@@ -1633,6 +1634,72 @@ const index = new Index({
 
 If you get some good results please feel free to share your encoder.
 
+## Fast-Boot Serialization for Server-Side-Rendering (PHP, Python, Ruby, Rust, Java, Go, Node.js, ...)
+
+When using Server-Side-Rendering you can create a different export which instantly boot up. Especially when using Server-side rendered content, this could help to restore an index on page load.
+
+> When your index is too large you should use the default export/import mechanism.
+
+As the first step populate the FlexSearch index with your contents.
+
+You have two options:
+
+### 1. Create a function as string
+
+```js
+const fn_string = index.serialize();
+```
+
+The contents of `fn_string` is a valid Javascript-Function declared as `inject(index)`. Store it or place this somewhere in your code.
+
+This function basically looks like:
+
+```js
+function inject(index){
+    index.reg = new Set([/* ... */]);
+    index.map = new Map([/* ... */]);
+    index.ctx = new Map([/* ... */]);
+}
+```
+
+After creating the index on client side just call the inject method like:
+
+```js
+const index = new Index();
+inject(index);
+```
+
+That's it.
+
+### 2. Create just a function body as string
+
+Alternatively you can use lazy function declaration by passing `false` to the serialize function:
+
+```js
+const fn_body = index.serialize(false);
+```
+
+You will get just the function body which looks like:
+
+```js
+index.reg = new Set([/* ... */]);
+index.map = new Map([/* ... */]);
+index.ctx = new Map([/* ... */]);
+```
+
+Now you can place this in your code directly (name your index as `index`), or you can also create an inject function from it, e.g.:
+
+```js
+const inject = new Function("index", fn_body);
+```
+
+This function is callable like the above example:
+
+```js
+const index = new Index();
+inject(index);
+```
+
 ## Load Library (Node.js, ESM, Legacy Browser)
 
 > Please do not use the `/src/` folder of this repo. It isn't meant to be used directly, instead it needs [conditional compilation](https://en.wikipedia.org/wiki/Conditional_compilation). You can easily perform a <a href="#builds">custom build</a>, but you shouldn't use the source folder for production. You will need at least any kind of compiler which resolve the compiler flags within the code like [Closure Compiler](https://github.com/google/closure-compiler) (Advanced Compilation) or with [Babel conditional-compile](https://github.com/brianZeng/babel-plugin-conditional-compile) plugin. The `/dist/` folder is containing every version which you probably need including unminified ESM modules.
diff --git a/dist/flexsearch.bundle.debug.js b/dist/flexsearch.bundle.debug.js
index f9eafad..426c42c 100644
--- a/dist/flexsearch.bundle.debug.js
+++ b/dist/flexsearch.bundle.debug.js
@@ -129,32 +129,32 @@ G.prototype.assign = function(a) {
   this.minlength = y(a.minlength, 1, this.minlength);
   this.maxlength = y(a.maxlength, 0, this.maxlength);
   if (this.cache = c = y(a.cache, !0, this.cache)) {
-    this.O = null, this.V = "number" === typeof c ? c : 2e5, this.J = new Map(), this.M = new Map(), this.B = this.h = 128;
+    this.M = null, this.T = "number" === typeof c ? c : 2e5, this.H = new Map(), this.K = new Map(), this.A = this.h = 128;
   }
-  this.C = "";
-  this.S = null;
-  this.P = "";
-  this.T = null;
+  this.B = "";
+  this.P = null;
+  this.N = "";
+  this.R = null;
   if (this.matcher) {
     for (const d of this.matcher.keys()) {
-      this.C += (this.C ? "|" : "") + d;
+      this.B += (this.B ? "|" : "") + d;
     }
   }
   if (this.stemmer) {
     for (const d of this.stemmer.keys()) {
-      this.P += (this.P ? "|" : "") + d;
+      this.N += (this.N ? "|" : "") + d;
     }
   }
   return this;
 };
 G.prototype.encode = function(a) {
   if (this.cache && a.length <= this.h) {
-    if (this.O) {
-      if (this.J.has(a)) {
-        return this.J.get(a);
+    if (this.M) {
+      if (this.H.has(a)) {
+        return this.H.get(a);
       }
     } else {
-      this.O = setTimeout(la, 0, this);
+      this.M = setTimeout(la, 0, this);
     }
   }
   this.normalize && (a = "function" === typeof this.normalize ? this.normalize(a) : ka ? a.normalize("NFKD").replace(ka, "").toLowerCase() : a.toLowerCase());
@@ -176,20 +176,20 @@ G.prototype.encode = function(a) {
     if (this.filter && this.filter.has(g)) {
       continue;
     }
-    if (this.cache && g.length <= this.B) {
-      if (this.O) {
-        var e = this.M.get(g);
+    if (this.cache && g.length <= this.A) {
+      if (this.M) {
+        var e = this.K.get(g);
         if (e || "" === e) {
           e && c.push(e);
           continue;
         }
       } else {
-        this.O = setTimeout(la, 0, this);
+        this.M = setTimeout(la, 0, this);
       }
     }
     let k;
-    this.stemmer && 2 < g.length && (this.T || (this.T = new RegExp("(?!^)(" + this.P + ")$")), g = g.replace(this.T, l => this.stemmer.get(l)), k = 1);
-    this.matcher && 1 < g.length && (this.S || (this.S = new RegExp("(" + this.C + ")", "g")), g = g.replace(this.S, l => this.matcher.get(l)), k = 1);
+    this.stemmer && 2 < g.length && (this.R || (this.R = new RegExp("(?!^)(" + this.N + ")$")), g = g.replace(this.R, l => this.stemmer.get(l)), k = 1);
+    this.matcher && 1 < g.length && (this.P || (this.P = new RegExp("(" + this.B + ")", "g")), g = g.replace(this.P, l => this.matcher.get(l)), k = 1);
     g && k && (g.length < this.minlength || this.filter && this.filter.has(g)) && (g = "");
     if (g && (this.mapper || this.dedupe && 1 < g.length)) {
       e = "";
@@ -203,17 +203,17 @@ G.prototype.encode = function(a) {
         g = g.replace(this.replacer[e], this.replacer[e + 1]);
       }
     }
-    this.cache && h.length <= this.B && (this.M.set(h, g), this.M.size > this.V && (this.M.clear(), this.B = this.B / 1.1 | 0));
+    this.cache && h.length <= this.A && (this.K.set(h, g), this.K.size > this.T && (this.K.clear(), this.A = this.A / 1.1 | 0));
     g && c.push(g);
   }
   this.finalize && (c = this.finalize(c) || c);
-  this.cache && a.length <= this.h && (this.J.set(a, c), this.J.size > this.V && (this.J.clear(), this.h = this.h / 1.1 | 0));
+  this.cache && a.length <= this.h && (this.H.set(a, c), this.H.size > this.T && (this.H.clear(), this.h = this.h / 1.1 | 0));
   return c;
 };
 function la(a) {
-  a.O = null;
-  a.J.clear();
-  a.M.clear();
+  a.M = null;
+  a.H.clear();
+  a.K.clear();
 }
 ;function ma(a, b, c) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
@@ -376,9 +376,9 @@ function L(a = 8) {
     return new L(a);
   }
   this.index = z();
-  this.C = [];
+  this.B = [];
   this.size = 0;
-  32 < a ? (this.h = xa, this.B = BigInt(a)) : (this.h = ya, this.B = a);
+  32 < a ? (this.h = xa, this.A = BigInt(a)) : (this.h = ya, this.A = a);
 }
 L.prototype.get = function(a) {
   const b = this.index[this.h(a)];
@@ -387,7 +387,7 @@ L.prototype.get = function(a) {
 L.prototype.set = function(a, b) {
   var c = this.h(a);
   let d = this.index[c];
-  d ? (c = d.size, d.set(a, b), (c -= d.size) && this.size++) : (this.index[c] = d = new Map([[a, b]]), this.C.push(d));
+  d ? (c = d.size, d.set(a, b), (c -= d.size) && this.size++) : (this.index[c] = d = new Map([[a, b]]), this.B.push(d));
 };
 function M(a = 8) {
   if (!this) {
@@ -395,20 +395,20 @@ function M(a = 8) {
   }
   this.index = z();
   this.h = [];
-  32 < a ? (this.C = xa, this.B = BigInt(a)) : (this.C = ya, this.B = a);
+  32 < a ? (this.B = xa, this.A = BigInt(a)) : (this.B = ya, this.A = a);
 }
 M.prototype.add = function(a) {
-  var b = this.C(a);
+  var b = this.B(a);
   let c = this.index[b];
   c ? (b = c.size, c.add(a), (b -= c.size) && this.size++) : (this.index[b] = c = new Set([a]), this.h.push(c));
 };
 u = L.prototype;
 u.has = M.prototype.has = function(a) {
-  const b = this.index[this.C(a)];
+  const b = this.index[this.B(a)];
   return b && b.has(a);
 };
 u.delete = M.prototype.delete = function(a) {
-  const b = this.index[this.C(a)];
+  const b = this.index[this.B(a)];
   b && b.delete(a) && this.size--;
 };
 u.clear = M.prototype.clear = function() {
@@ -438,18 +438,18 @@ u.entries = M.prototype.entries = function*() {
   }
 };
 function ya(a) {
-  let b = 2 ** this.B - 1;
+  let b = 2 ** this.A - 1;
   if ("number" == typeof a) {
     return a & b;
   }
-  let c = 0, d = this.B + 1;
+  let c = 0, d = this.A + 1;
   for (let e = 0; e < a.length; e++) {
     c = (c * d ^ a.charCodeAt(e)) & b;
   }
-  return 32 === this.B ? c + 2 ** 31 : c;
+  return 32 === this.A ? c + 2 ** 31 : c;
 }
 function xa(a) {
-  let b = BigInt(2) ** this.B - BigInt(1);
+  let b = BigInt(2) ** this.A - BigInt(1);
   var c = typeof a;
   if ("bigint" === c) {
     return a & b;
@@ -458,7 +458,7 @@ function xa(a) {
     return BigInt(a) & b;
   }
   c = BigInt(0);
-  let d = this.B + BigInt(1);
+  let d = this.A + BigInt(1);
   for (let e = 0; e < a.length; e++) {
     c = (c * d ^ BigInt(a.charCodeAt(e))) & b;
   }
@@ -493,7 +493,7 @@ function N(a) {
 ;z();
 O.prototype.add = function(a, b, c, d) {
   if (b && (a || 0 === a)) {
-    if (!d && !c && this.A.has(a)) {
+    if (!d && !c && this.reg.has(a)) {
       return this.update(a, b);
     }
     b = this.encoder.encode(b);
@@ -532,7 +532,7 @@ O.prototype.add = function(a, b, c, d) {
               }
             default:
               if (Q(this, m, p, f, a, c), n && 1 < d && r < d - 1) {
-                for (e = z(), g = this.U, f = p, h = Math.min(n + 1, d - r), e[f] = 1, k = 1; k < h; k++) {
+                for (e = z(), g = this.S, f = p, h = Math.min(n + 1, d - r), e[f] = 1, k = 1; k < h; k++) {
                   if ((p = b[this.rtl ? d - 1 - r - k : r + k]) && !e[p]) {
                     e[p] = 1;
                     const t = this.score ? this.score(b, f, r, p, k) : P(g + (d / 2 > g ? 0 : 1), d, r, h - 1, k - 1), x = this.bidirectional && p > f;
@@ -543,29 +543,29 @@ O.prototype.add = function(a, b, c, d) {
           }
         }
       }
-      this.fastupdate || this.A.add(a);
+      this.fastupdate || this.reg.add(a);
     } else {
       b = "";
     }
   }
-  this.db && (b || this.K.push({del:a}), this.W && Ca(this));
+  this.db && (b || this.I.push({del:a}), this.U && Ca(this));
   return this;
 };
 function Q(a, b, c, d, e, f, g) {
-  let h = g ? a.F : a.map, k;
+  let h = g ? a.ctx : a.map, k;
   if (!b[c] || !g || !(k = b[c])[g]) {
     if (g ? (b = k || (b[c] = z()), 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 === 2 ** 31 - 1) {
         b = new K(h);
         if (a.fastupdate) {
-          for (let l of a.A.values()) {
+          for (let l of a.reg.values()) {
             l.includes(h) && (l[l.indexOf(h)] = b);
           }
         }
         k[d] = h = b;
       }
       h.push(e);
-      a.fastupdate && ((d = a.A.get(e)) ? d.push(h) : a.A.set(e, [h]));
+      a.fastupdate && ((d = a.reg.get(e)) ? d.push(h) : a.reg.set(e, [h]));
     }
   }
 }
@@ -656,12 +656,12 @@ function Da(a) {
   if (c.length) {
     return Promise.all(c).then(function() {
       a.result.length && (d = [a.result].concat(d));
-      a.result = Ea(d, e, f, g, h, a.G);
+      a.result = Ea(d, e, f, g, h, a.D);
       return h ? a.result : a;
     });
   }
   this.result.length && (d = [this.result].concat(d));
-  this.result = Ea(d, e, f, g, h, a.G);
+  this.result = Ea(d, e, f, g, h, a.D);
   return h ? this.result : this;
 };
 function Ea(a, b, c, d, e, f) {
@@ -746,12 +746,12 @@ function Ea(a, b, c, d, e, f) {
     if (a.length) {
       return Promise.all(a).then(function() {
         d = [b.result].concat(d);
-        b.result = Fa(d, e, f, g, b.G);
+        b.result = Fa(d, e, f, g, b.D);
         return g ? b.result : b;
       });
     }
     d = [this.result].concat(d);
-    this.result = Fa(d, e, f, g, b.G);
+    this.result = Fa(d, e, f, g, b.D);
     return g ? this.result : this;
   }
   return this;
@@ -842,12 +842,12 @@ function Fa(a, b, c, d, e) {
   if (c.length) {
     return Promise.all(c).then(function() {
       a.result.length && (d = [a.result].concat(d));
-      a.result = Ga(d, e, f, g, !h, a.G);
+      a.result = Ga(d, e, f, g, !h, a.D);
       return h ? a.result : a;
     });
   }
   this.result.length && (d = [this.result].concat(d));
-  this.result = Ga(d, e, f, g, !h, a.G);
+  this.result = Ga(d, e, f, g, !h, a.D);
   return h ? this.result : this;
 };
 function Ga(a, b, c, d, e, f) {
@@ -957,7 +957,7 @@ function Ha(a, b) {
   }
   this.index = null;
   this.result = a || [];
-  this.G = 0;
+  this.D = 0;
 }
 S.prototype.limit = function(a) {
   if (this.result.length) {
@@ -987,7 +987,7 @@ S.prototype.offset = function(a) {
   return this;
 };
 S.prototype.boost = function(a) {
-  this.G += a;
+  this.D += a;
   return this;
 };
 S.prototype.resolve = function(a, b, c) {
@@ -1122,7 +1122,7 @@ O.prototype.search = function(a, b, c) {
     return async function() {
       for (let t, x; q < e; q++) {
         x = a[q];
-        r ? (t = await V(p, x, r), t = Ka(t, d, f, p.U, b, g, 2 === e), f && !1 === t && d.length || (r = x)) : (t = await V(p, x), t = Ka(t, d, f, p.resolution, b, g, 1 === e));
+        r ? (t = await V(p, x, r), t = Ka(t, d, f, p.S, b, g, 2 === e), f && !1 === t && d.length || (r = x)) : (t = await V(p, x), t = Ka(t, d, f, p.resolution, b, g, 1 === e));
         if (t) {
           return t;
         }
@@ -1146,7 +1146,7 @@ O.prototype.search = function(a, b, c) {
   }
   for (let p, t; q < e; q++) {
     t = a[q];
-    r ? (p = V(this, t, r), p = Ka(p, d, f, this.U, b, g, 2 === e), f && !1 === p && d.length || (r = t)) : (p = V(this, t), p = Ka(p, d, f, this.resolution, b, g, 1 === e));
+    r ? (p = V(this, t, r), p = Ka(p, d, f, this.S, b, g, 2 === e), f && !1 === p && d.length || (r = t)) : (p = V(this, t), p = Ka(p, d, f, this.resolution, b, g, 1 === e));
     if (p) {
       return p;
     }
@@ -1201,11 +1201,11 @@ function V(a, b, c, d, e, f, g, h) {
   if (a.db) {
     return c ? a.db.get(k ? c : b, k ? b : c, d, e, f, g, h) : a.db.get(b, "", d, e, f, g, h);
   }
-  a = c ? (a = a.F.get(k ? b : c)) && a.get(k ? c : b) : a.map.get(b);
+  a = c ? (a = a.ctx.get(k ? b : c)) && a.get(k ? c : b) : a.map.get(b);
   return a;
 }
 ;O.prototype.remove = function(a, b) {
-  const c = this.A.size && (this.fastupdate ? this.A.get(a) : this.A.has(a));
+  const c = this.reg.size && (this.fastupdate ? this.reg.get(a) : this.reg.has(a));
   if (c) {
     if (this.fastupdate) {
       for (let d = 0, e; d < c.length; d++) {
@@ -1219,11 +1219,11 @@ function V(a, b, c, d, e, f, g, h) {
         }
       }
     } else {
-      La(this.map, a), this.depth && La(this.F, a);
+      La(this.map, a), this.depth && La(this.ctx, a);
     }
-    b || this.A.delete(a);
+    b || this.reg.delete(a);
   }
-  this.db && (this.K.push({del:a}), this.W && Ca(this));
+  this.db && (this.I.push({del:a}), this.U && Ca(this));
   this.cache && this.cache.remove(a);
   return this;
 };
@@ -1270,17 +1270,17 @@ function La(a, b) {
   this.score = a.score || null;
   (e = a.keystore || 0) && (this.keystore = e);
   this.map = e ? new L(e) : new Map();
-  this.F = e ? new L(e) : new Map();
-  this.A = b || (this.fastupdate ? e ? new L(e) : new Map() : e ? new M(e) : new Set());
-  this.U = c.resolution || 1;
+  this.ctx = e ? new L(e) : new Map();
+  this.reg = b || (this.fastupdate ? e ? new L(e) : new Map() : e ? new M(e) : new Set());
+  this.S = c.resolution || 1;
   this.rtl = d.rtl || a.rtl || !1;
   this.cache = (e = a.cache || null) && new H(e);
   this.resolve = !1 !== a.resolve;
   if (e = a.db) {
     this.db = e.mount(this);
   }
-  this.W = !1 !== a.commit;
-  this.K = [];
+  this.U = !1 !== a.commit;
+  this.I = [];
   this.h = null;
 }
 u = O.prototype;
@@ -1300,17 +1300,17 @@ function Ca(a) {
 }
 u.clear = function() {
   this.map.clear();
-  this.F.clear();
-  this.A.clear();
+  this.ctx.clear();
+  this.reg.clear();
   this.cache && this.cache.clear();
-  this.db && (this.h && clearTimeout(this.h), this.h = null, this.K = [{clear:!0}]);
+  this.db && (this.h && clearTimeout(this.h), this.h = null, this.I = [{clear:!0}]);
   return this;
 };
 u.append = function(a, b) {
   return this.add(a, b, !0);
 };
 u.contain = function(a) {
-  return this.db ? this.db.has(a) : this.A.has(a);
+  return this.db ? this.db.has(a) : this.reg.has(a);
 };
 u.update = function(a, b) {
   if (this.async) {
@@ -1338,7 +1338,7 @@ u.cleanup = function() {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
   Ma(this.map);
-  this.depth && Ma(this.F);
+  this.depth && Ma(this.ctx);
   return this;
 };
 u.searchCache = ma;
@@ -1353,16 +1353,16 @@ u.export = function(a, b, c, d, e, f) {
       h = "reg";
       if (this.fastupdate) {
         k = z();
-        for (let l of this.A.keys()) {
+        for (let l of this.reg.keys()) {
           k[l] = 1;
         }
       } else {
-        k = this.A;
+        k = this.reg;
       }
       break;
     case 1:
       h = "cfg";
-      k = {doc:0, opt:this.B ? 1 : 0};
+      k = {doc:0, opt:this.A ? 1 : 0};
       break;
     case 2:
       h = "map";
@@ -1370,7 +1370,7 @@ u.export = function(a, b, c, d, e, f) {
       break;
     case 3:
       h = "ctx";
-      k = this.F;
+      k = this.ctx;
       break;
     default:
       "undefined" === typeof c && f && f();
@@ -1383,20 +1383,70 @@ u.import = function(a, b) {
   if (b) {
     switch(B(b) && (b = JSON.parse(b)), a) {
       case "cfg":
-        this.B = !!b.opt;
+        this.A = !!b.opt;
         break;
       case "reg":
         this.fastupdate = !1;
-        this.A = b;
+        this.reg = b;
         break;
       case "map":
         this.map = b;
         break;
       case "ctx":
-        this.F = b;
+        this.ctx = b;
     }
   }
 };
+u.serialize = function(a = !0) {
+  if (!this.reg.size) {
+    return "";
+  }
+  let b = "", c = "";
+  for (var d of this.reg.keys()) {
+    c || (c = typeof d), b += (b ? "," : "") + ("string" === c ? '"' + d + '"' : d);
+  }
+  b = "index.reg=new Set([" + b + "]);";
+  d = "";
+  for (var e of this.map.entries()) {
+    var f = e[0], g = e[1], h = "";
+    for (let m = 0, n; m < g.length; m++) {
+      n = g[m] || [""];
+      var k = "";
+      for (var l = 0; l < n.length; l++) {
+        k += (k ? "," : "") + ("string" === c ? '"' + n[l] + '"' : n[l]);
+      }
+      k = "[" + k + "]";
+      h += (h ? "," : "") + k;
+    }
+    h = '["' + f + '",[' + h + "]]";
+    d += (d ? "," : "") + h;
+  }
+  d = "index.map=new Map([" + d + "]);";
+  e = "";
+  for (const m of this.ctx.entries()) {
+    f = m[0];
+    g = m[1];
+    for (const n of g.entries()) {
+      g = n[0];
+      h = n[1];
+      k = "";
+      for (let q = 0, r; q < h.length; q++) {
+        r = h[q] || [""];
+        l = "";
+        for (let p = 0; p < r.length; p++) {
+          l += (l ? "," : "") + ("string" === c ? '"' + r[p] + '"' : r[p]);
+        }
+        l = "[" + l + "]";
+        k += (k ? "," : "") + l;
+      }
+      k = 'new Map([["' + g + '",[' + k + "]]])";
+      k = '["' + f + '",' + k + "]";
+      e += (e ? "," : "") + k;
+    }
+  }
+  e = "index.ctx=new Map([" + e + "]);";
+  return a ? "function inject(index){" + b + d + e + "}" : b + d + e;
+};
 Ba(O.prototype);
 async function Na(a) {
   a = a.data;
@@ -1467,24 +1517,24 @@ function Pa(a, b, c) {
 ;Y.prototype.add = function(a, b, c) {
   C(a) && (b = a, a = ca(b, this.key));
   if (b && (a || 0 === a)) {
-    if (!c && this.A.has(a)) {
+    if (!c && this.reg.has(a)) {
       return this.update(a, b);
     }
     for (let h = 0, k; h < this.field.length; h++) {
-      k = this.I[h];
+      k = this.G[h];
       var d = this.index.get(this.field[h]);
       if ("function" === typeof k) {
         var e = k(b);
         e && d.add(a, e, !1, !0);
       } else {
-        if (e = k.L, !e || e(b)) {
-          k.constructor === String ? k = ["" + k] : B(k) && (k = [k]), Qa(b, k, this.N, 0, d, a, k[0], c);
+        if (e = k.J, !e || e(b)) {
+          k.constructor === String ? k = ["" + k] : B(k) && (k = [k]), Qa(b, k, this.L, 0, d, a, k[0], c);
         }
       }
     }
     if (this.tag) {
-      for (d = 0; d < this.H.length; d++) {
-        var f = this.H[d], g = this.R[d];
+      for (d = 0; d < this.F.length; d++) {
+        var f = this.F[d], g = this.O[d];
         e = this.tag.get(g);
         let h = z();
         if ("function" === typeof f) {
@@ -1492,7 +1542,7 @@ function Pa(a, b, c) {
             continue;
           }
         } else {
-          const k = f.L;
+          const k = f.J;
           if (k && !k(b)) {
             continue;
           }
@@ -1506,14 +1556,14 @@ function Pa(a, b, c) {
               if (m.length === 2 ** 31 - 1) {
                 g = new K(m);
                 if (this.fastupdate) {
-                  for (let n of this.A.values()) {
+                  for (let n of this.reg.values()) {
                     n.includes(m) && (n[n.indexOf(m)] = g);
                   }
                 }
                 e.set(l, m = g);
               }
               m.push(a);
-              this.fastupdate && ((g = this.A.get(a)) ? g.push(m) : this.A.set(a, [m]));
+              this.fastupdate && ((g = this.reg.get(a)) ? g.push(m) : this.reg.set(a, [m]));
             }
           }
         } else {
@@ -1523,11 +1573,11 @@ function Pa(a, b, c) {
     }
     if (this.store && (!c || !this.store.has(a))) {
       let h;
-      if (this.D) {
+      if (this.C) {
         h = z();
-        for (let k = 0, l; k < this.D.length; k++) {
-          l = this.D[k];
-          if ((c = l.L) && !c(b)) {
+        for (let k = 0, l; k < this.C.length; k++) {
+          l = this.C[k];
+          if ((c = l.J) && !c(b)) {
             continue;
           }
           let m;
@@ -1536,7 +1586,7 @@ function Pa(a, b, c) {
             if (!m) {
               continue;
             }
-            l = [l.X];
+            l = [l.V];
           } else if (B(l) || l.constructor === String) {
             h[l] = b[l];
             continue;
@@ -1673,7 +1723,7 @@ function Qa(a, b, c, d, e, f, g, h) {
   let A;
   for (let w = 0, v, I, J; w < k.length; w++) {
     I = k[w];
-    if (this.db && this.tag && !this.I[w]) {
+    if (this.db && this.tag && !this.G[w]) {
       continue;
     }
     let D;
@@ -1681,7 +1731,7 @@ function Qa(a, b, c, d, e, f, g, h) {
     if (d) {
       v = d[w];
     } else {
-      if (t = D || c, x = this.index.get(I), n && (this.db && (t.tag = n, A = x.db.Z, t.field = k), A || (t.enrich = !1)), p) {
+      if (t = D || c, x = this.index.get(I), n && (this.db && (t.tag = n, A = x.db.X, t.field = k), A || (t.enrich = !1)), p) {
         p[w] = x.searchAsync(a, b, t);
         t && q && (t.enrich = q);
         continue;
@@ -1822,13 +1872,13 @@ function Ta(a) {
   }
   const b = a.document || a.doc || a;
   var c, d;
-  this.I = [];
+  this.G = [];
   this.field = [];
-  this.N = [];
-  this.key = (c = b.key || b.id) && Va(c, this.N) || "id";
+  this.L = [];
+  this.key = (c = b.key || b.id) && Va(c, this.L) || "id";
   (d = a.keystore || 0) && (this.keystore = d);
-  this.A = (this.fastupdate = !!a.fastupdate) ? d ? new L(d) : new Map() : d ? new M(d) : new Set();
-  this.D = (c = b.store || null) && !0 !== c && [];
+  this.reg = (this.fastupdate = !!a.fastupdate) ? d ? new L(d) : new Map() : d ? new M(d) : new Set();
+  this.C = (c = b.store || null) && !0 !== c && [];
   this.store = c && (d ? new L(d) : new Map());
   this.cache = (c = a.cache || null) && new H(c);
   a.cache = !1;
@@ -1846,15 +1896,15 @@ function Ta(a) {
       c.set(f, h);
       h.worker || (this.worker = !1);
     }
-    this.worker || c.set(f, new O(g, this.A));
-    g.custom ? this.I[e] = g.custom : (this.I[e] = Va(f, this.N), g.filter && ("string" === typeof this.I[e] && (this.I[e] = new String(this.I[e])), this.I[e].L = g.filter));
+    this.worker || c.set(f, new O(g, this.reg));
+    g.custom ? this.G[e] = g.custom : (this.G[e] = Va(f, this.L), g.filter && ("string" === typeof this.G[e] && (this.G[e] = new String(this.G[e])), this.G[e].J = g.filter));
     this.field[e] = f;
   }
-  if (this.D) {
+  if (this.C) {
     d = b.store;
     B(d) && (d = [d]);
     for (let e = 0, f, g; e < d.length; e++) {
-      f = d[e], g = f.field || f, f.custom ? (this.D[e] = f.custom, f.custom.X = g) : (this.D[e] = Va(g, this.N), f.filter && ("string" === typeof this.D[e] && (this.D[e] = new String(this.D[e])), this.D[e].L = f.filter));
+      f = d[e], g = f.field || f, f.custom ? (this.C[e] = f.custom, f.custom.V = g) : (this.C[e] = Va(g, this.L), f.filter && ("string" === typeof this.C[e] && (this.C[e] = new String(this.C[e])), this.C[e].J = f.filter));
     }
   }
   this.index = c;
@@ -1862,16 +1912,16 @@ function Ta(a) {
   if (c = b.tag) {
     if ("string" === typeof c && (c = [c]), c.length) {
       this.tag = new Map();
-      this.H = [];
-      this.R = [];
+      this.F = [];
+      this.O = [];
       for (let e = 0, f, g; e < c.length; e++) {
         f = c[e];
         g = f.field || f;
         if (!g) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
-        f.custom ? this.H[e] = f.custom : (this.H[e] = Va(g, this.N), f.filter && ("string" === typeof this.H[e] && (this.H[e] = new String(this.H[e])), this.H[e].L = f.filter));
-        this.R[e] = g;
+        f.custom ? this.F[e] = f.custom : (this.F[e] = Va(g, this.L), f.filter && ("string" === typeof this.F[e] && (this.F[e] = new String(this.F[e])), this.F[e].J = f.filter));
+        this.O[e] = g;
         this.tag.set(g, new Map());
       }
     }
@@ -1882,10 +1932,10 @@ u = Y.prototype;
 u.mount = function(a) {
   let b = this.field;
   if (this.tag) {
-    for (let e = 0, f; e < this.R.length; e++) {
-      f = this.R[e];
+    for (let e = 0, f; e < this.O.length; e++) {
+      f = this.O[e];
       var c = this.index.get(f);
-      c || (this.index.set(f, c = new O({}, this.A)), b === this.field && (b = b.slice(0)), b.push(f));
+      c || (this.index.set(f, c = new O({}, this.reg)), b === this.field && (b = b.slice(0)), b.push(f));
       c.tag = this.tag.get(f);
     }
   }
@@ -1898,7 +1948,7 @@ u.mount = function(a) {
     h.id = a.id;
     c[e] = h.mount(f);
     f.document = !0;
-    e ? f.Y = !0 : f.store = this.store;
+    e ? f.W = !0 : f.store = this.store;
   }
   this.db = this.async = !0;
   return Promise.all(c);
@@ -1909,7 +1959,7 @@ u.commit = async function(a, b) {
     c.push(d.db.commit(d, a, b));
   }
   await Promise.all(c);
-  this.A.clear();
+  this.reg.clear();
 };
 function Va(a, b) {
   const c = a.split(":");
@@ -1931,7 +1981,7 @@ u.remove = function(a) {
   for (var b of this.index.values()) {
     b.remove(a, !0);
   }
-  if (this.A.has(a)) {
+  if (this.reg.has(a)) {
     if (this.tag && !this.fastupdate) {
       for (let c of this.tag.values()) {
         for (let d of c) {
@@ -1942,7 +1992,7 @@ u.remove = function(a) {
       }
     }
     this.store && this.store.delete(a);
-    this.A.delete(a);
+    this.reg.delete(a);
   }
   this.cache && this.cache.remove(a);
   return this;
@@ -1960,7 +2010,7 @@ u.clear = function() {
   return this;
 };
 u.contain = function(a) {
-  return this.db ? this.index.get(this.field[0]).db.has(a) : this.A.has(a);
+  return this.db ? this.index.get(this.field[0]).db.has(a) : this.reg.has(a);
 };
 u.cleanup = function() {
   for (const a of this.index.values()) {
@@ -2018,9 +2068,9 @@ u.import = function(a, b) {
         break;
       case "reg":
         this.fastupdate = !1;
-        this.A = b;
+        this.reg = b;
         for (let d = 0, e; d < this.field.length; d++) {
-          e = this.index[this.field[d]], e.A = b, e.fastupdate = !1;
+          e = this.index[this.field[d]], e.reg = b, e.fastupdate = !1;
         }
         break;
       case "store":
@@ -2044,7 +2094,7 @@ function Ya(a, b = {}) {
   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.Z = !1;
+  this.X = !1;
   this.db = null;
   this.h = {};
 }
@@ -2184,22 +2234,22 @@ u.transaction = function(a, b, c) {
 };
 u.commit = async function(a, b, c) {
   if (b) {
-    await this.clear(), a.K = [];
+    await this.clear(), a.I = [];
   } else {
-    let d = a.K;
-    a.K = [];
+    let d = a.I;
+    a.I = [];
     for (let e = 0, f; e < d.length; e++) {
       if (f = d[e], f.clear) {
         await this.clear();
         b = !0;
         break;
       } else {
-        d[e] = f.$;
+        d[e] = f.Y;
       }
     }
-    b || (c || (d = d.concat(ba(a.A))), d.length && await this.remove(d));
+    b || (c || (d = d.concat(ba(a.reg))), d.length && await this.remove(d));
   }
-  a.A.size && (await this.transaction("map", "readwrite", function(d) {
+  a.reg.size && (await this.transaction("map", "readwrite", function(d) {
     for (const e of a.map) {
       const f = e[0], g = e[1];
       g.length && (b ? d.put(g, f) : d.get(f).onsuccess = function() {
@@ -2226,7 +2276,7 @@ u.commit = async function(a, b, c) {
       });
     }
   }), await this.transaction("ctx", "readwrite", function(d) {
-    for (const e of a.F) {
+    for (const e of a.ctx) {
       const f = e[0], g = e[1];
       for (const h of g) {
         const k = h[0], l = h[1];
@@ -2259,8 +2309,8 @@ u.commit = async function(a, b, c) {
       const f = e[0], g = e[1];
       d.put("object" === typeof g ? JSON.stringify(g) : 1, f);
     }
-  }) : a.Y || await this.transaction("reg", "readwrite", function(d) {
-    for (const e of a.A.keys()) {
+  }) : a.W || await this.transaction("reg", "readwrite", function(d) {
+    for (const e of a.reg.keys()) {
       d.put(1, e);
     }
   }), a.tag && await this.transaction("tag", "readwrite", function(d) {
@@ -2272,7 +2322,7 @@ u.commit = async function(a, b, c) {
         d.put(h, f);
       });
     }
-  }), a.map.clear(), a.F.clear(), a.tag && a.tag.clear(), a.store && a.store.clear(), a.document || a.A.clear());
+  }), a.map.clear(), a.ctx.clear(), a.tag && a.tag.clear(), a.store && a.store.clear(), a.document || a.reg.clear());
 };
 function $a(a, b, c) {
   const d = a.value;
diff --git a/dist/flexsearch.bundle.min.js b/dist/flexsearch.bundle.min.js
index b894c2b..40bfcb2 100644
--- a/dist/flexsearch.bundle.min.js
+++ b/dist/flexsearch.bundle.min.js
@@ -15,74 +15,76 @@ function B(a){return"string"===typeof a}function C(a){return"object"===typeof a}
 ["\u0477","\u0475"],["\u04c2","\u0436"],["\u04d1","\u0430"],["\u04d3","\u0430"],["\u04d7","\u0435"],["\u04db","\u04d9"],["\u04dd","\u0436"],["\u04df","\u0437"],["\u04e3","\u0438"],["\u04e5","\u0438"],["\u04e7","\u043e"],["\u04eb","\u04e9"],["\u04ed","\u044d"],["\u04ef","\u0443"],["\u04f1","\u0443"],["\u04f3","\u0443"],["\u04f5","\u0447"]];const fa=/[^\p{L}\p{N}]+/u,ha=/(\d{3})/g,ia=/(\D)(\d{3})/g,ja=/(\d{3})(\D)/g,ka="".normalize&&/[\u0300-\u036f]/g;function F(a){if(!this)return new F(...arguments);for(let b=0;b<arguments.length;b++)this.assign(arguments[b])}
 F.prototype.assign=function(a){this.normalize=y(a.normalize,!0,this.normalize);let b=a.include,c=b||a.exclude||a.split;if("object"===typeof c){let d=!b,e="";a.include||(e+="\\p{Z}");c.letter&&(e+="\\p{L}");c.number&&(e+="\\p{N}",d=!!b);c.symbol&&(e+="\\p{S}");c.punctuation&&(e+="\\p{P}");c.control&&(e+="\\p{C}");if(c=c.char)e+="object"===typeof c?c.join(""):c;this.split=new RegExp("["+(b?"^":"")+e+"]+","u");this.numeric=d}else this.split=y(c,fa,this.split),this.numeric=y(this.numeric,!0);this.prepare=
 y(a.prepare,null,this.prepare);this.finalize=y(a.finalize,null,this.finalize);ka||(this.mapper=new Map(ea));this.rtl=a.rtl||!1;this.dedupe=y(a.dedupe,!0,this.dedupe);this.filter=y((c=a.filter)&&new Set(c),null,this.filter);this.matcher=y((c=a.matcher)&&new Map(c),null,this.matcher);this.mapper=y((c=a.mapper)&&new Map(c),null,this.mapper);this.stemmer=y((c=a.stemmer)&&new Map(c),null,this.stemmer);this.replacer=y(a.replacer,null,this.replacer);this.minlength=y(a.minlength,1,this.minlength);this.maxlength=
-y(a.maxlength,0,this.maxlength);if(this.cache=c=y(a.cache,!0,this.cache))this.O=null,this.V="number"===typeof c?c:2E5,this.J=new Map,this.M=new Map,this.B=this.h=128;this.C="";this.S=null;this.P="";this.T=null;if(this.matcher)for(const d of this.matcher.keys())this.C+=(this.C?"|":"")+d;if(this.stemmer)for(const d of this.stemmer.keys())this.P+=(this.P?"|":"")+d;return this};
-F.prototype.encode=function(a){if(this.cache&&a.length<=this.h)if(this.O){if(this.J.has(a))return this.J.get(a)}else this.O=setTimeout(la,0,this);this.normalize&&(a="function"===typeof this.normalize?this.normalize(a):ka?a.normalize("NFKD").replace(ka,"").toLowerCase():a.toLowerCase());this.prepare&&(a=this.prepare(a));this.numeric&&3<a.length&&(a=a.replace(ia,"$1 $2").replace(ja,"$1 $2").replace(ha,"$1 "));const b=!(this.dedupe||this.mapper||this.filter||this.matcher||this.stemmer||this.replacer);
-let c=[],d=this.split||""===this.split?a.split(this.split):a;for(let f=0,g,h;f<d.length;f++){if(!(g=h=d[f]))continue;if(g.length<this.minlength)continue;if(b){c.push(g);continue}if(this.filter&&this.filter.has(g))continue;if(this.cache&&g.length<=this.B)if(this.O){var e=this.M.get(g);if(e||""===e){e&&c.push(e);continue}}else this.O=setTimeout(la,0,this);let k;this.stemmer&&2<g.length&&(this.T||(this.T=new RegExp("(?!^)("+this.P+")$")),g=g.replace(this.T,l=>this.stemmer.get(l)),k=1);this.matcher&&
-1<g.length&&(this.S||(this.S=new RegExp("("+this.C+")","g")),g=g.replace(this.S,l=>this.matcher.get(l)),k=1);g&&k&&(g.length<this.minlength||this.filter&&this.filter.has(g))&&(g="");if(g&&(this.mapper||this.dedupe&&1<g.length)){e="";for(let l=0,m="",n,q;l<g.length;l++)n=g.charAt(l),n===m&&this.dedupe||((q=this.mapper&&this.mapper.get(n))||""===q?q===m&&this.dedupe||!(m=q)||(e+=q):e+=m=n);g=e}if(g&&this.replacer)for(e=0;g&&e<this.replacer.length;e+=2)g=g.replace(this.replacer[e],this.replacer[e+1]);
-this.cache&&h.length<=this.B&&(this.M.set(h,g),this.M.size>this.V&&(this.M.clear(),this.B=this.B/1.1|0));g&&c.push(g)}this.finalize&&(c=this.finalize(c)||c);this.cache&&a.length<=this.h&&(this.J.set(a,c),this.J.size>this.V&&(this.J.clear(),this.h=this.h/1.1|0));return c};function la(a){a.O=null;a.J.clear();a.M.clear()};function ma(a,b,c){a=("object"===typeof a?""+a.query:a).toLowerCase();let d=this.cache.get(a);if(!d){d=this.search(a,b,c);if(d.then){const e=this;d.then(function(f){e.cache.set(a,f);return f})}this.cache.set(a,d)}return d}function G(a){this.limit=a&&!0!==a?a:1E3;this.cache=new Map;this.h=""}G.prototype.set=function(a,b){this.cache.set(this.h=a,b);this.cache.size>this.limit&&this.cache.delete(this.cache.keys().next().value)};
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 this.mount(a.db)}u=Y.prototype;
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-u.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.A.clear()};function Va(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))&&(b[d]=!0),a&&(c[d++]=a);d<c.length&&(c.length=d);return 1<d?c:c[0]}u.append=function(a,b){return this.add(a,b,!0)};u.update=function(a,b){return this.remove(a).add(a,b)};
-u.remove=function(a){C(a)&&(a=ca(a,this.key));for(var b of this.index.values())b.remove(a,!0);if(this.A.has(a)){if(this.tag&&!this.fastupdate)for(let c of this.tag.values())for(let d of c){b=d[0];const e=d[1],f=e.indexOf(a);-1<f&&(1<e.length?e.splice(f,1):c.delete(b))}this.store&&this.store.delete(a);this.A.delete(a)}this.cache&&this.cache.remove(a);return this};
-u.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};u.contain=function(a){return this.db?this.index.get(this.field[0]).db.has(a):this.A.has(a)};u.cleanup=function(){for(const a of this.index.values())a.cleanup();return this};u.get=function(a){return this.db?this.index.get(this.field[0]).db.enrich(a).then(function(b){return b[0]&&b[0].doc}):this.store.get(a)};
+u.mount=function(a){let b=this.field;if(this.tag)for(let e=0,f;e<this.O.length;e++){f=this.O[e];var c=this.index.get(f);c||(this.index.set(f,c=new O({},this.reg)),b===this.field&&(b=b.slice(0)),b.push(f));c.tag=this.tag.get(f)}c=[];const d={db:a.db,type:a.type,fastupdate:a.fastupdate};for(let e=0,f,g;e<b.length;e++){d.field=g=b[e];f=this.index.get(g);const h=new a.constructor(a.id,d);h.id=a.id;c[e]=h.mount(f);f.document=!0;e?f.W=!0:f.store=this.store}this.db=this.async=!0;return Promise.all(c)};
+u.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()};function Va(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))&&(b[d]=!0),a&&(c[d++]=a);d<c.length&&(c.length=d);return 1<d?c:c[0]}u.append=function(a,b){return this.add(a,b,!0)};u.update=function(a,b){return this.remove(a).add(a,b)};
+u.remove=function(a){C(a)&&(a=ca(a,this.key));for(var b of this.index.values())b.remove(a,!0);if(this.reg.has(a)){if(this.tag&&!this.fastupdate)for(let c of this.tag.values())for(let d of c){b=d[0];const e=d[1],f=e.indexOf(a);-1<f&&(1<e.length?e.splice(f,1):c.delete(b))}this.store&&this.store.delete(a);this.reg.delete(a)}this.cache&&this.cache.remove(a);return this};
+u.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};u.contain=function(a){return this.db?this.index.get(this.field[0]).db.has(a):this.reg.has(a)};u.cleanup=function(){for(const a of this.index.values())a.cleanup();return this};u.get=function(a){return this.db?this.index.get(this.field[0]).db.enrich(a).then(function(b){return b[0]&&b[0].doc}):this.store.get(a)};
 u.set=function(a,b){this.store.set(a,b);return this};u.searchCache=ma;u.export=function(a,b,c,d,e,f){let g;"undefined"===typeof f&&(g=new Promise(k=>{f=k}));e||(e=0);d||(d=0);if(d<this.field.length){c=this.field[d];var h=this.index[c];b=this;h.export(a,b,e?c:"",d,e++,f)||(d++,b.export(a,b,c,d,1,f))}else{switch(e){case 1:b="tag";h=this.h;c=null;break;case 2:b="store";h=this.store;c=null;break;default:f();return}za(a,this,c,b,d,e,h,f)}return g};
-u.import=function(a,b){if(b)switch(B(b)&&(b=JSON.parse(b)),a){case "tag":this.h=b;break;case "reg":this.fastupdate=!1;this.A=b;for(let d=0,e;d<this.field.length;d++)e=this.index[this.field[d]],e.A=b,e.fastupdate=!1;break;case "store":this.store=b;break;default:a=a.split(".");const c=a[0];a=a[1];c&&a&&this.index[c].import(a,b)}};Ba(Y.prototype);const Wa="undefined"!==typeof window&&(window.indexedDB||window.mozIndexedDB||window.webkitIndexedDB||window.msIndexedDB),Xa=["map","ctx","tag","reg","cfg"];
-function Ya(a,b={}){if(!this)return new Ya(a,b);"object"===typeof a&&(b=a=a.name);a||console.info("Default storage space was used, because a name was not passed.");this.id="flexsearch"+(a?":"+a.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"");this.field=b.field?b.field.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"";this.Z=!1;this.db=null;this.h={}}u=Ya.prototype;u.mount=function(a){if(a.constructor===Y)return a.mount(this);a.db=this;return Za(this)};
+u.import=function(a,b){if(b)switch(B(b)&&(b=JSON.parse(b)),a){case "tag":this.h=b;break;case "reg":this.fastupdate=!1;this.reg=b;for(let d=0,e;d<this.field.length;d++)e=this.index[this.field[d]],e.reg=b,e.fastupdate=!1;break;case "store":this.store=b;break;default:a=a.split(".");const c=a[0];a=a[1];c&&a&&this.index[c].import(a,b)}};Ba(Y.prototype);const Wa="undefined"!==typeof window&&(window.indexedDB||window.mozIndexedDB||window.webkitIndexedDB||window.msIndexedDB),Xa=["map","ctx","tag","reg","cfg"];
+function Ya(a,b={}){if(!this)return new Ya(a,b);"object"===typeof a&&(b=a=a.name);a||console.info("Default storage space was used, because a name was not passed.");this.id="flexsearch"+(a?":"+a.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"");this.field=b.field?b.field.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"";this.X=!1;this.db=null;this.h={}}u=Ya.prototype;u.mount=function(a){if(a.constructor===Y)return a.mount(this);a.db=this;return Za(this)};
 function Za(a){navigator.storage&&navigator.storage.persist();return a.db||new Promise(function(b,c){const d=Wa.open(a.id+(a.field?":"+a.field:""),1);d.onupgradeneeded=function(){const e=a.db=this.result;Xa.forEach(f=>{e.objectStoreNames.contains(f)||e.createObjectStore(f)})};d.onblocked=function(e){console.error("blocked",e);c()};d.onerror=function(e){console.error(this.error,e);c()};d.onsuccess=function(){a.db=this.result;a.db.onversionchange=function(){a.close()};b(a)}})}
 u.close=function(){this.db.close();this.db=null};u.clear=function(){const a=this.db.transaction(Xa,"readwrite");for(let b=0;b<Xa.length;b++)a.objectStore(Xa[b]).clear();return Z(a)};
 u.get=function(a,b,c=0,d=0,e=!0,f=!1){a=this.db.transaction(b?"ctx":"map","readonly").objectStore(b?"ctx":"map").get(b?b+":"+a:a);const g=this;return Z(a).then(function(h){let k=[];if(!h||!h.length)return k;if(e){if(!c&&!d&&1===h.length)return h[0];for(let l=0,m;l<h.length;l++)if((m=h[l])&&m.length){if(d>=m.length){d-=m.length;continue}const n=c?d+Math.min(m.length-d,c):m.length;for(let q=d;q<n;q++)k.push(m[q]);d=0;if(k.length===c)break}return f?g.enrich(k):k}return h})};
 u.tag=function(a,b=0,c=0,d=!1){a=this.db.transaction("tag","readonly").objectStore("tag").get(a);const e=this;return Z(a).then(function(f){if(!f||!f.length||c>=f.length)return[];if(!b&&!c)return f;f=f.slice(c,c+b);return d?e.enrich(f):f})};
 u.enrich=function(a){"object"!==typeof a&&(a=[a]);const b=this.db.transaction("reg","readonly").objectStore("reg"),c=[];for(let d=0;d<a.length;d++)c[d]=Z(b.get(a[d]));return Promise.all(c).then(function(d){for(let e=0;e<d.length;e++)d[e]={id:a[e],doc:d[e]?JSON.parse(d[e]):null};return d})};u.has=function(a){a=this.db.transaction("reg","readonly").objectStore("reg").getKey(a);return Z(a)};u.search=null;u.info=function(){};
 u.transaction=function(a,b,c){let d=this.h[a+":"+b];if(d)return c.call(this,d);let e=this.db.transaction(a,b);this.h[a+":"+b]=d=e.objectStore(a);return new Promise((f,g)=>{e.onerror=h=>{this.h[a+":"+b]=null;e.abort();e=d=null;g(h)};e.oncomplete=h=>{e=d=this.h[a+":"+b]=null;f(h||!0)};return c.call(this,d)})};
-u.commit=async function(a,b,c){if(b)await this.clear(),a.K=[];else{let d=a.K;a.K=[];for(let e=0,f;e<d.length;e++)if(f=d[e],f.clear){await this.clear();b=!0;break}else d[e]=f.$;b||(c||(d=d.concat(ba(a.A))),d.length&&await this.remove(d))}a.A.size&&(await this.transaction("map","readwrite",function(d){for(const e of a.map){const f=e[0],g=e[1];g.length&&(b?d.put(g,f):d.get(f).onsuccess=function(){let h=this.result;var k;if(h&&h.length){const l=Math.max(h.length,g.length);for(let m=0,n,q;m<l;m++)if((q=
-g[m])&&q.length){if((n=h[m])&&n.length)for(k=0;k<q.length;k++)n.push(q[k]);else h[m]=q;k=1}}else h=g,k=1;k&&d.put(h,f)})}}),await this.transaction("ctx","readwrite",function(d){for(const e of a.F){const f=e[0],g=e[1];for(const h of g){const k=h[0],l=h[1];l.length&&(b?d.put(l,f+":"+k):d.get(f+":"+k).onsuccess=function(){let m=this.result;var n;if(m&&m.length){const q=Math.max(m.length,l.length);for(let r=0,p,t;r<q;r++)if((t=l[r])&&t.length){if((p=m[r])&&p.length)for(n=0;n<t.length;n++)p.push(t[n]);
-else m[r]=t;n=1}}else m=l,n=1;n&&d.put(m,f+":"+k)})}}}),a.store?await this.transaction("reg","readwrite",function(d){for(const e of a.store){const f=e[0],g=e[1];d.put("object"===typeof g?JSON.stringify(g):1,f)}}):a.Y||await this.transaction("reg","readwrite",function(d){for(const e of a.A.keys())d.put(1,e)}),a.tag&&await this.transaction("tag","readwrite",function(d){for(const e of a.tag){const f=e[0],g=e[1];g.length&&(d.get(f).onsuccess=function(){let h=this.result;h=h&&h.length?h.concat(g):g;d.put(h,
-f)})}}),a.map.clear(),a.F.clear(),a.tag&&a.tag.clear(),a.store&&a.store.clear(),a.document||a.A.clear())};function $a(a,b,c){const d=a.value;let e,f,g=0;for(let h=0,k;h<d.length;h++){if(k=c?d:d[h]){for(let l=0,m,n;l<b.length;l++)if(n=b[l],m=k.indexOf(f?parseInt(n,10):n),0>m&&!f&&"string"===typeof n&&!isNaN(n)&&(m=k.indexOf(parseInt(n,10)))&&(f=1),0<=m)if(e=1,1<k.length)k.splice(m,1);else{d[h]=[];break}g+=k.length}if(c)break}g?e&&a.update(d):a.delete();a.continue()}
+u.commit=async function(a,b,c){if(b)await this.clear(),a.I=[];else{let d=a.I;a.I=[];for(let e=0,f;e<d.length;e++)if(f=d[e],f.clear){await this.clear();b=!0;break}else d[e]=f.Y;b||(c||(d=d.concat(ba(a.reg))),d.length&&await this.remove(d))}a.reg.size&&(await this.transaction("map","readwrite",function(d){for(const e of a.map){const f=e[0],g=e[1];g.length&&(b?d.put(g,f):d.get(f).onsuccess=function(){let h=this.result;var k;if(h&&h.length){const l=Math.max(h.length,g.length);for(let m=0,n,q;m<l;m++)if((q=
+g[m])&&q.length){if((n=h[m])&&n.length)for(k=0;k<q.length;k++)n.push(q[k]);else h[m]=q;k=1}}else h=g,k=1;k&&d.put(h,f)})}}),await this.transaction("ctx","readwrite",function(d){for(const e of a.ctx){const f=e[0],g=e[1];for(const h of g){const k=h[0],l=h[1];l.length&&(b?d.put(l,f+":"+k):d.get(f+":"+k).onsuccess=function(){let m=this.result;var n;if(m&&m.length){const q=Math.max(m.length,l.length);for(let r=0,p,t;r<q;r++)if((t=l[r])&&t.length){if((p=m[r])&&p.length)for(n=0;n<t.length;n++)p.push(t[n]);
+else m[r]=t;n=1}}else m=l,n=1;n&&d.put(m,f+":"+k)})}}}),a.store?await this.transaction("reg","readwrite",function(d){for(const e of a.store){const f=e[0],g=e[1];d.put("object"===typeof g?JSON.stringify(g):1,f)}}):a.W||await this.transaction("reg","readwrite",function(d){for(const e of a.reg.keys())d.put(1,e)}),a.tag&&await this.transaction("tag","readwrite",function(d){for(const e of a.tag){const f=e[0],g=e[1];g.length&&(d.get(f).onsuccess=function(){let h=this.result;h=h&&h.length?h.concat(g):g;
+d.put(h,f)})}}),a.map.clear(),a.ctx.clear(),a.tag&&a.tag.clear(),a.store&&a.store.clear(),a.document||a.reg.clear())};function $a(a,b,c){const d=a.value;let e,f,g=0;for(let h=0,k;h<d.length;h++){if(k=c?d:d[h]){for(let l=0,m,n;l<b.length;l++)if(n=b[l],m=k.indexOf(f?parseInt(n,10):n),0>m&&!f&&"string"===typeof n&&!isNaN(n)&&(m=k.indexOf(parseInt(n,10)))&&(f=1),0<=m)if(e=1,1<k.length)k.splice(m,1);else{d[h]=[];break}g+=k.length}if(c)break}g?e&&a.update(d):a.delete();a.continue()}
 u.remove=function(a){"object"!==typeof a&&(a=[a]);return Promise.all([this.transaction("map","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&$a(c,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&$a(c,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&$a(c,a,!0)}}),this.transaction("reg","readwrite",function(b){for(let c=0;c<a.length;c++)b.delete(a[c])})])};
 function Z(a){return new Promise((b,c)=>{a.onsuccess=function(){b(this.result)};a.oncomplete=function(){b(this.result)};a.onerror=c;a=null})};const ab={Index:O,Charset:va,Encoder:F,Document:Y,Worker:W,Resolver:S,IndexedDB:Ya,Language:{}},cb=self;let db;(db=cb.define)&&db.amd?db([],function(){return ab}):"object"===typeof cb.exports?cb.exports=ab:cb.FlexSearch=ab;}(this));
diff --git a/dist/flexsearch.bundle.module.debug.js b/dist/flexsearch.bundle.module.debug.js
index 7f15126..2bd290d 100644
--- a/dist/flexsearch.bundle.module.debug.js
+++ b/dist/flexsearch.bundle.module.debug.js
@@ -128,32 +128,32 @@ G.prototype.assign = function(a) {
   this.minlength = y(a.minlength, 1, this.minlength);
   this.maxlength = y(a.maxlength, 0, this.maxlength);
   if (this.cache = c = y(a.cache, !0, this.cache)) {
-    this.O = null, this.V = "number" === typeof c ? c : 2e5, this.J = new Map(), this.M = new Map(), this.B = this.h = 128;
+    this.M = null, this.T = "number" === typeof c ? c : 2e5, this.H = new Map(), this.K = new Map(), this.A = this.h = 128;
   }
-  this.C = "";
-  this.S = null;
-  this.P = "";
-  this.T = null;
+  this.B = "";
+  this.P = null;
+  this.N = "";
+  this.R = null;
   if (this.matcher) {
     for (const d of this.matcher.keys()) {
-      this.C += (this.C ? "|" : "") + d;
+      this.B += (this.B ? "|" : "") + d;
     }
   }
   if (this.stemmer) {
     for (const d of this.stemmer.keys()) {
-      this.P += (this.P ? "|" : "") + d;
+      this.N += (this.N ? "|" : "") + d;
     }
   }
   return this;
 };
 G.prototype.encode = function(a) {
   if (this.cache && a.length <= this.h) {
-    if (this.O) {
-      if (this.J.has(a)) {
-        return this.J.get(a);
+    if (this.M) {
+      if (this.H.has(a)) {
+        return this.H.get(a);
       }
     } else {
-      this.O = setTimeout(la, 0, this);
+      this.M = setTimeout(la, 0, this);
     }
   }
   this.normalize && (a = "function" === typeof this.normalize ? this.normalize(a) : ka ? a.normalize("NFKD").replace(ka, "").toLowerCase() : a.toLowerCase());
@@ -175,20 +175,20 @@ G.prototype.encode = function(a) {
     if (this.filter && this.filter.has(g)) {
       continue;
     }
-    if (this.cache && g.length <= this.B) {
-      if (this.O) {
-        var e = this.M.get(g);
+    if (this.cache && g.length <= this.A) {
+      if (this.M) {
+        var e = this.K.get(g);
         if (e || "" === e) {
           e && c.push(e);
           continue;
         }
       } else {
-        this.O = setTimeout(la, 0, this);
+        this.M = setTimeout(la, 0, this);
       }
     }
     let k;
-    this.stemmer && 2 < g.length && (this.T || (this.T = new RegExp("(?!^)(" + this.P + ")$")), g = g.replace(this.T, l => this.stemmer.get(l)), k = 1);
-    this.matcher && 1 < g.length && (this.S || (this.S = new RegExp("(" + this.C + ")", "g")), g = g.replace(this.S, l => this.matcher.get(l)), k = 1);
+    this.stemmer && 2 < g.length && (this.R || (this.R = new RegExp("(?!^)(" + this.N + ")$")), g = g.replace(this.R, l => this.stemmer.get(l)), k = 1);
+    this.matcher && 1 < g.length && (this.P || (this.P = new RegExp("(" + this.B + ")", "g")), g = g.replace(this.P, l => this.matcher.get(l)), k = 1);
     g && k && (g.length < this.minlength || this.filter && this.filter.has(g)) && (g = "");
     if (g && (this.mapper || this.dedupe && 1 < g.length)) {
       e = "";
@@ -202,17 +202,17 @@ G.prototype.encode = function(a) {
         g = g.replace(this.replacer[e], this.replacer[e + 1]);
       }
     }
-    this.cache && h.length <= this.B && (this.M.set(h, g), this.M.size > this.V && (this.M.clear(), this.B = this.B / 1.1 | 0));
+    this.cache && h.length <= this.A && (this.K.set(h, g), this.K.size > this.T && (this.K.clear(), this.A = this.A / 1.1 | 0));
     g && c.push(g);
   }
   this.finalize && (c = this.finalize(c) || c);
-  this.cache && a.length <= this.h && (this.J.set(a, c), this.J.size > this.V && (this.J.clear(), this.h = this.h / 1.1 | 0));
+  this.cache && a.length <= this.h && (this.H.set(a, c), this.H.size > this.T && (this.H.clear(), this.h = this.h / 1.1 | 0));
   return c;
 };
 function la(a) {
-  a.O = null;
-  a.J.clear();
-  a.M.clear();
+  a.M = null;
+  a.H.clear();
+  a.K.clear();
 }
 ;function ma(a, b, c) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
@@ -375,9 +375,9 @@ function L(a = 8) {
     return new L(a);
   }
   this.index = z();
-  this.C = [];
+  this.B = [];
   this.size = 0;
-  32 < a ? (this.h = xa, this.B = BigInt(a)) : (this.h = ya, this.B = a);
+  32 < a ? (this.h = xa, this.A = BigInt(a)) : (this.h = ya, this.A = a);
 }
 L.prototype.get = function(a) {
   const b = this.index[this.h(a)];
@@ -386,7 +386,7 @@ L.prototype.get = function(a) {
 L.prototype.set = function(a, b) {
   var c = this.h(a);
   let d = this.index[c];
-  d ? (c = d.size, d.set(a, b), (c -= d.size) && this.size++) : (this.index[c] = d = new Map([[a, b]]), this.C.push(d));
+  d ? (c = d.size, d.set(a, b), (c -= d.size) && this.size++) : (this.index[c] = d = new Map([[a, b]]), this.B.push(d));
 };
 function M(a = 8) {
   if (!this) {
@@ -394,20 +394,20 @@ function M(a = 8) {
   }
   this.index = z();
   this.h = [];
-  32 < a ? (this.C = xa, this.B = BigInt(a)) : (this.C = ya, this.B = a);
+  32 < a ? (this.B = xa, this.A = BigInt(a)) : (this.B = ya, this.A = a);
 }
 M.prototype.add = function(a) {
-  var b = this.C(a);
+  var b = this.B(a);
   let c = this.index[b];
   c ? (b = c.size, c.add(a), (b -= c.size) && this.size++) : (this.index[b] = c = new Set([a]), this.h.push(c));
 };
 u = L.prototype;
 u.has = M.prototype.has = function(a) {
-  const b = this.index[this.C(a)];
+  const b = this.index[this.B(a)];
   return b && b.has(a);
 };
 u.delete = M.prototype.delete = function(a) {
-  const b = this.index[this.C(a)];
+  const b = this.index[this.B(a)];
   b && b.delete(a) && this.size--;
 };
 u.clear = M.prototype.clear = function() {
@@ -437,18 +437,18 @@ u.entries = M.prototype.entries = function*() {
   }
 };
 function ya(a) {
-  let b = 2 ** this.B - 1;
+  let b = 2 ** this.A - 1;
   if ("number" == typeof a) {
     return a & b;
   }
-  let c = 0, d = this.B + 1;
+  let c = 0, d = this.A + 1;
   for (let e = 0; e < a.length; e++) {
     c = (c * d ^ a.charCodeAt(e)) & b;
   }
-  return 32 === this.B ? c + 2 ** 31 : c;
+  return 32 === this.A ? c + 2 ** 31 : c;
 }
 function xa(a) {
-  let b = BigInt(2) ** this.B - BigInt(1);
+  let b = BigInt(2) ** this.A - BigInt(1);
   var c = typeof a;
   if ("bigint" === c) {
     return a & b;
@@ -457,7 +457,7 @@ function xa(a) {
     return BigInt(a) & b;
   }
   c = BigInt(0);
-  let d = this.B + BigInt(1);
+  let d = this.A + BigInt(1);
   for (let e = 0; e < a.length; e++) {
     c = (c * d ^ BigInt(a.charCodeAt(e))) & b;
   }
@@ -492,7 +492,7 @@ function N(a) {
 ;z();
 O.prototype.add = function(a, b, c, d) {
   if (b && (a || 0 === a)) {
-    if (!d && !c && this.A.has(a)) {
+    if (!d && !c && this.reg.has(a)) {
       return this.update(a, b);
     }
     b = this.encoder.encode(b);
@@ -531,7 +531,7 @@ O.prototype.add = function(a, b, c, d) {
               }
             default:
               if (Q(this, m, p, f, a, c), n && 1 < d && r < d - 1) {
-                for (e = z(), g = this.U, f = p, h = Math.min(n + 1, d - r), e[f] = 1, k = 1; k < h; k++) {
+                for (e = z(), g = this.S, f = p, h = Math.min(n + 1, d - r), e[f] = 1, k = 1; k < h; k++) {
                   if ((p = b[this.rtl ? d - 1 - r - k : r + k]) && !e[p]) {
                     e[p] = 1;
                     const t = this.score ? this.score(b, f, r, p, k) : P(g + (d / 2 > g ? 0 : 1), d, r, h - 1, k - 1), x = this.bidirectional && p > f;
@@ -542,29 +542,29 @@ O.prototype.add = function(a, b, c, d) {
           }
         }
       }
-      this.fastupdate || this.A.add(a);
+      this.fastupdate || this.reg.add(a);
     } else {
       b = "";
     }
   }
-  this.db && (b || this.K.push({del:a}), this.W && Ca(this));
+  this.db && (b || this.I.push({del:a}), this.U && Ca(this));
   return this;
 };
 function Q(a, b, c, d, e, f, g) {
-  let h = g ? a.F : a.map, k;
+  let h = g ? a.ctx : a.map, k;
   if (!b[c] || !g || !(k = b[c])[g]) {
     if (g ? (b = k || (b[c] = z()), 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 === 2 ** 31 - 1) {
         b = new K(h);
         if (a.fastupdate) {
-          for (let l of a.A.values()) {
+          for (let l of a.reg.values()) {
             l.includes(h) && (l[l.indexOf(h)] = b);
           }
         }
         k[d] = h = b;
       }
       h.push(e);
-      a.fastupdate && ((d = a.A.get(e)) ? d.push(h) : a.A.set(e, [h]));
+      a.fastupdate && ((d = a.reg.get(e)) ? d.push(h) : a.reg.set(e, [h]));
     }
   }
 }
@@ -655,12 +655,12 @@ function Da(a) {
   if (c.length) {
     return Promise.all(c).then(function() {
       a.result.length && (d = [a.result].concat(d));
-      a.result = Ea(d, e, f, g, h, a.G);
+      a.result = Ea(d, e, f, g, h, a.D);
       return h ? a.result : a;
     });
   }
   this.result.length && (d = [this.result].concat(d));
-  this.result = Ea(d, e, f, g, h, a.G);
+  this.result = Ea(d, e, f, g, h, a.D);
   return h ? this.result : this;
 };
 function Ea(a, b, c, d, e, f) {
@@ -745,12 +745,12 @@ function Ea(a, b, c, d, e, f) {
     if (a.length) {
       return Promise.all(a).then(function() {
         d = [b.result].concat(d);
-        b.result = Fa(d, e, f, g, b.G);
+        b.result = Fa(d, e, f, g, b.D);
         return g ? b.result : b;
       });
     }
     d = [this.result].concat(d);
-    this.result = Fa(d, e, f, g, b.G);
+    this.result = Fa(d, e, f, g, b.D);
     return g ? this.result : this;
   }
   return this;
@@ -841,12 +841,12 @@ function Fa(a, b, c, d, e) {
   if (c.length) {
     return Promise.all(c).then(function() {
       a.result.length && (d = [a.result].concat(d));
-      a.result = Ga(d, e, f, g, !h, a.G);
+      a.result = Ga(d, e, f, g, !h, a.D);
       return h ? a.result : a;
     });
   }
   this.result.length && (d = [this.result].concat(d));
-  this.result = Ga(d, e, f, g, !h, a.G);
+  this.result = Ga(d, e, f, g, !h, a.D);
   return h ? this.result : this;
 };
 function Ga(a, b, c, d, e, f) {
@@ -956,7 +956,7 @@ function Ha(a, b) {
   }
   this.index = null;
   this.result = a || [];
-  this.G = 0;
+  this.D = 0;
 }
 S.prototype.limit = function(a) {
   if (this.result.length) {
@@ -986,7 +986,7 @@ S.prototype.offset = function(a) {
   return this;
 };
 S.prototype.boost = function(a) {
-  this.G += a;
+  this.D += a;
   return this;
 };
 S.prototype.resolve = function(a, b, c) {
@@ -1121,7 +1121,7 @@ O.prototype.search = function(a, b, c) {
     return async function() {
       for (let t, x; q < e; q++) {
         x = a[q];
-        r ? (t = await V(p, x, r), t = Ka(t, d, f, p.U, b, g, 2 === e), f && !1 === t && d.length || (r = x)) : (t = await V(p, x), t = Ka(t, d, f, p.resolution, b, g, 1 === e));
+        r ? (t = await V(p, x, r), t = Ka(t, d, f, p.S, b, g, 2 === e), f && !1 === t && d.length || (r = x)) : (t = await V(p, x), t = Ka(t, d, f, p.resolution, b, g, 1 === e));
         if (t) {
           return t;
         }
@@ -1145,7 +1145,7 @@ O.prototype.search = function(a, b, c) {
   }
   for (let p, t; q < e; q++) {
     t = a[q];
-    r ? (p = V(this, t, r), p = Ka(p, d, f, this.U, b, g, 2 === e), f && !1 === p && d.length || (r = t)) : (p = V(this, t), p = Ka(p, d, f, this.resolution, b, g, 1 === e));
+    r ? (p = V(this, t, r), p = Ka(p, d, f, this.S, b, g, 2 === e), f && !1 === p && d.length || (r = t)) : (p = V(this, t), p = Ka(p, d, f, this.resolution, b, g, 1 === e));
     if (p) {
       return p;
     }
@@ -1200,11 +1200,11 @@ function V(a, b, c, d, e, f, g, h) {
   if (a.db) {
     return c ? a.db.get(k ? c : b, k ? b : c, d, e, f, g, h) : a.db.get(b, "", d, e, f, g, h);
   }
-  a = c ? (a = a.F.get(k ? b : c)) && a.get(k ? c : b) : a.map.get(b);
+  a = c ? (a = a.ctx.get(k ? b : c)) && a.get(k ? c : b) : a.map.get(b);
   return a;
 }
 ;O.prototype.remove = function(a, b) {
-  const c = this.A.size && (this.fastupdate ? this.A.get(a) : this.A.has(a));
+  const c = this.reg.size && (this.fastupdate ? this.reg.get(a) : this.reg.has(a));
   if (c) {
     if (this.fastupdate) {
       for (let d = 0, e; d < c.length; d++) {
@@ -1218,11 +1218,11 @@ function V(a, b, c, d, e, f, g, h) {
         }
       }
     } else {
-      La(this.map, a), this.depth && La(this.F, a);
+      La(this.map, a), this.depth && La(this.ctx, a);
     }
-    b || this.A.delete(a);
+    b || this.reg.delete(a);
   }
-  this.db && (this.K.push({del:a}), this.W && Ca(this));
+  this.db && (this.I.push({del:a}), this.U && Ca(this));
   this.cache && this.cache.remove(a);
   return this;
 };
@@ -1269,17 +1269,17 @@ function La(a, b) {
   this.score = a.score || null;
   (e = a.keystore || 0) && (this.keystore = e);
   this.map = e ? new L(e) : new Map();
-  this.F = e ? new L(e) : new Map();
-  this.A = b || (this.fastupdate ? e ? new L(e) : new Map() : e ? new M(e) : new Set());
-  this.U = c.resolution || 1;
+  this.ctx = e ? new L(e) : new Map();
+  this.reg = b || (this.fastupdate ? e ? new L(e) : new Map() : e ? new M(e) : new Set());
+  this.S = c.resolution || 1;
   this.rtl = d.rtl || a.rtl || !1;
   this.cache = (e = a.cache || null) && new H(e);
   this.resolve = !1 !== a.resolve;
   if (e = a.db) {
     this.db = e.mount(this);
   }
-  this.W = !1 !== a.commit;
-  this.K = [];
+  this.U = !1 !== a.commit;
+  this.I = [];
   this.h = null;
 }
 u = O.prototype;
@@ -1299,17 +1299,17 @@ function Ca(a) {
 }
 u.clear = function() {
   this.map.clear();
-  this.F.clear();
-  this.A.clear();
+  this.ctx.clear();
+  this.reg.clear();
   this.cache && this.cache.clear();
-  this.db && (this.h && clearTimeout(this.h), this.h = null, this.K = [{clear:!0}]);
+  this.db && (this.h && clearTimeout(this.h), this.h = null, this.I = [{clear:!0}]);
   return this;
 };
 u.append = function(a, b) {
   return this.add(a, b, !0);
 };
 u.contain = function(a) {
-  return this.db ? this.db.has(a) : this.A.has(a);
+  return this.db ? this.db.has(a) : this.reg.has(a);
 };
 u.update = function(a, b) {
   if (this.async) {
@@ -1337,7 +1337,7 @@ u.cleanup = function() {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
   Ma(this.map);
-  this.depth && Ma(this.F);
+  this.depth && Ma(this.ctx);
   return this;
 };
 u.searchCache = ma;
@@ -1352,16 +1352,16 @@ u.export = function(a, b, c, d, e, f) {
       h = "reg";
       if (this.fastupdate) {
         k = z();
-        for (let l of this.A.keys()) {
+        for (let l of this.reg.keys()) {
           k[l] = 1;
         }
       } else {
-        k = this.A;
+        k = this.reg;
       }
       break;
     case 1:
       h = "cfg";
-      k = {doc:0, opt:this.B ? 1 : 0};
+      k = {doc:0, opt:this.A ? 1 : 0};
       break;
     case 2:
       h = "map";
@@ -1369,7 +1369,7 @@ u.export = function(a, b, c, d, e, f) {
       break;
     case 3:
       h = "ctx";
-      k = this.F;
+      k = this.ctx;
       break;
     default:
       "undefined" === typeof c && f && f();
@@ -1382,20 +1382,70 @@ u.import = function(a, b) {
   if (b) {
     switch(B(b) && (b = JSON.parse(b)), a) {
       case "cfg":
-        this.B = !!b.opt;
+        this.A = !!b.opt;
         break;
       case "reg":
         this.fastupdate = !1;
-        this.A = b;
+        this.reg = b;
         break;
       case "map":
         this.map = b;
         break;
       case "ctx":
-        this.F = b;
+        this.ctx = b;
     }
   }
 };
+u.serialize = function(a = !0) {
+  if (!this.reg.size) {
+    return "";
+  }
+  let b = "", c = "";
+  for (var d of this.reg.keys()) {
+    c || (c = typeof d), b += (b ? "," : "") + ("string" === c ? '"' + d + '"' : d);
+  }
+  b = "index.reg=new Set([" + b + "]);";
+  d = "";
+  for (var e of this.map.entries()) {
+    var f = e[0], g = e[1], h = "";
+    for (let m = 0, n; m < g.length; m++) {
+      n = g[m] || [""];
+      var k = "";
+      for (var l = 0; l < n.length; l++) {
+        k += (k ? "," : "") + ("string" === c ? '"' + n[l] + '"' : n[l]);
+      }
+      k = "[" + k + "]";
+      h += (h ? "," : "") + k;
+    }
+    h = '["' + f + '",[' + h + "]]";
+    d += (d ? "," : "") + h;
+  }
+  d = "index.map=new Map([" + d + "]);";
+  e = "";
+  for (const m of this.ctx.entries()) {
+    f = m[0];
+    g = m[1];
+    for (const n of g.entries()) {
+      g = n[0];
+      h = n[1];
+      k = "";
+      for (let q = 0, r; q < h.length; q++) {
+        r = h[q] || [""];
+        l = "";
+        for (let p = 0; p < r.length; p++) {
+          l += (l ? "," : "") + ("string" === c ? '"' + r[p] + '"' : r[p]);
+        }
+        l = "[" + l + "]";
+        k += (k ? "," : "") + l;
+      }
+      k = 'new Map([["' + g + '",[' + k + "]]])";
+      k = '["' + f + '",' + k + "]";
+      e += (e ? "," : "") + k;
+    }
+  }
+  e = "index.ctx=new Map([" + e + "]);";
+  return a ? "function inject(index){" + b + d + e + "}" : b + d + e;
+};
 Ba(O.prototype);
 async function Na(a) {
   a = a.data;
@@ -1466,24 +1516,24 @@ function Pa(a, b, c) {
 ;Y.prototype.add = function(a, b, c) {
   C(a) && (b = a, a = ca(b, this.key));
   if (b && (a || 0 === a)) {
-    if (!c && this.A.has(a)) {
+    if (!c && this.reg.has(a)) {
       return this.update(a, b);
     }
     for (let h = 0, k; h < this.field.length; h++) {
-      k = this.I[h];
+      k = this.G[h];
       var d = this.index.get(this.field[h]);
       if ("function" === typeof k) {
         var e = k(b);
         e && d.add(a, e, !1, !0);
       } else {
-        if (e = k.L, !e || e(b)) {
-          k.constructor === String ? k = ["" + k] : B(k) && (k = [k]), Qa(b, k, this.N, 0, d, a, k[0], c);
+        if (e = k.J, !e || e(b)) {
+          k.constructor === String ? k = ["" + k] : B(k) && (k = [k]), Qa(b, k, this.L, 0, d, a, k[0], c);
         }
       }
     }
     if (this.tag) {
-      for (d = 0; d < this.H.length; d++) {
-        var f = this.H[d], g = this.R[d];
+      for (d = 0; d < this.F.length; d++) {
+        var f = this.F[d], g = this.O[d];
         e = this.tag.get(g);
         let h = z();
         if ("function" === typeof f) {
@@ -1491,7 +1541,7 @@ function Pa(a, b, c) {
             continue;
           }
         } else {
-          const k = f.L;
+          const k = f.J;
           if (k && !k(b)) {
             continue;
           }
@@ -1505,14 +1555,14 @@ function Pa(a, b, c) {
               if (m.length === 2 ** 31 - 1) {
                 g = new K(m);
                 if (this.fastupdate) {
-                  for (let n of this.A.values()) {
+                  for (let n of this.reg.values()) {
                     n.includes(m) && (n[n.indexOf(m)] = g);
                   }
                 }
                 e.set(l, m = g);
               }
               m.push(a);
-              this.fastupdate && ((g = this.A.get(a)) ? g.push(m) : this.A.set(a, [m]));
+              this.fastupdate && ((g = this.reg.get(a)) ? g.push(m) : this.reg.set(a, [m]));
             }
           }
         } else {
@@ -1522,11 +1572,11 @@ function Pa(a, b, c) {
     }
     if (this.store && (!c || !this.store.has(a))) {
       let h;
-      if (this.D) {
+      if (this.C) {
         h = z();
-        for (let k = 0, l; k < this.D.length; k++) {
-          l = this.D[k];
-          if ((c = l.L) && !c(b)) {
+        for (let k = 0, l; k < this.C.length; k++) {
+          l = this.C[k];
+          if ((c = l.J) && !c(b)) {
             continue;
           }
           let m;
@@ -1535,7 +1585,7 @@ function Pa(a, b, c) {
             if (!m) {
               continue;
             }
-            l = [l.X];
+            l = [l.V];
           } else if (B(l) || l.constructor === String) {
             h[l] = b[l];
             continue;
@@ -1672,7 +1722,7 @@ function Qa(a, b, c, d, e, f, g, h) {
   let A;
   for (let w = 0, v, I, J; w < k.length; w++) {
     I = k[w];
-    if (this.db && this.tag && !this.I[w]) {
+    if (this.db && this.tag && !this.G[w]) {
       continue;
     }
     let D;
@@ -1680,7 +1730,7 @@ function Qa(a, b, c, d, e, f, g, h) {
     if (d) {
       v = d[w];
     } else {
-      if (t = D || c, x = this.index.get(I), n && (this.db && (t.tag = n, A = x.db.Z, t.field = k), A || (t.enrich = !1)), p) {
+      if (t = D || c, x = this.index.get(I), n && (this.db && (t.tag = n, A = x.db.X, t.field = k), A || (t.enrich = !1)), p) {
         p[w] = x.searchAsync(a, b, t);
         t && q && (t.enrich = q);
         continue;
@@ -1821,13 +1871,13 @@ function Ta(a) {
   }
   const b = a.document || a.doc || a;
   var c, d;
-  this.I = [];
+  this.G = [];
   this.field = [];
-  this.N = [];
-  this.key = (c = b.key || b.id) && Va(c, this.N) || "id";
+  this.L = [];
+  this.key = (c = b.key || b.id) && Va(c, this.L) || "id";
   (d = a.keystore || 0) && (this.keystore = d);
-  this.A = (this.fastupdate = !!a.fastupdate) ? d ? new L(d) : new Map() : d ? new M(d) : new Set();
-  this.D = (c = b.store || null) && !0 !== c && [];
+  this.reg = (this.fastupdate = !!a.fastupdate) ? d ? new L(d) : new Map() : d ? new M(d) : new Set();
+  this.C = (c = b.store || null) && !0 !== c && [];
   this.store = c && (d ? new L(d) : new Map());
   this.cache = (c = a.cache || null) && new H(c);
   a.cache = !1;
@@ -1845,15 +1895,15 @@ function Ta(a) {
       c.set(f, h);
       h.worker || (this.worker = !1);
     }
-    this.worker || c.set(f, new O(g, this.A));
-    g.custom ? this.I[e] = g.custom : (this.I[e] = Va(f, this.N), g.filter && ("string" === typeof this.I[e] && (this.I[e] = new String(this.I[e])), this.I[e].L = g.filter));
+    this.worker || c.set(f, new O(g, this.reg));
+    g.custom ? this.G[e] = g.custom : (this.G[e] = Va(f, this.L), g.filter && ("string" === typeof this.G[e] && (this.G[e] = new String(this.G[e])), this.G[e].J = g.filter));
     this.field[e] = f;
   }
-  if (this.D) {
+  if (this.C) {
     d = b.store;
     B(d) && (d = [d]);
     for (let e = 0, f, g; e < d.length; e++) {
-      f = d[e], g = f.field || f, f.custom ? (this.D[e] = f.custom, f.custom.X = g) : (this.D[e] = Va(g, this.N), f.filter && ("string" === typeof this.D[e] && (this.D[e] = new String(this.D[e])), this.D[e].L = f.filter));
+      f = d[e], g = f.field || f, f.custom ? (this.C[e] = f.custom, f.custom.V = g) : (this.C[e] = Va(g, this.L), f.filter && ("string" === typeof this.C[e] && (this.C[e] = new String(this.C[e])), this.C[e].J = f.filter));
     }
   }
   this.index = c;
@@ -1861,16 +1911,16 @@ function Ta(a) {
   if (c = b.tag) {
     if ("string" === typeof c && (c = [c]), c.length) {
       this.tag = new Map();
-      this.H = [];
-      this.R = [];
+      this.F = [];
+      this.O = [];
       for (let e = 0, f, g; e < c.length; e++) {
         f = c[e];
         g = f.field || f;
         if (!g) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
-        f.custom ? this.H[e] = f.custom : (this.H[e] = Va(g, this.N), f.filter && ("string" === typeof this.H[e] && (this.H[e] = new String(this.H[e])), this.H[e].L = f.filter));
-        this.R[e] = g;
+        f.custom ? this.F[e] = f.custom : (this.F[e] = Va(g, this.L), f.filter && ("string" === typeof this.F[e] && (this.F[e] = new String(this.F[e])), this.F[e].J = f.filter));
+        this.O[e] = g;
         this.tag.set(g, new Map());
       }
     }
@@ -1881,10 +1931,10 @@ u = Y.prototype;
 u.mount = function(a) {
   let b = this.field;
   if (this.tag) {
-    for (let e = 0, f; e < this.R.length; e++) {
-      f = this.R[e];
+    for (let e = 0, f; e < this.O.length; e++) {
+      f = this.O[e];
       var c = this.index.get(f);
-      c || (this.index.set(f, c = new O({}, this.A)), b === this.field && (b = b.slice(0)), b.push(f));
+      c || (this.index.set(f, c = new O({}, this.reg)), b === this.field && (b = b.slice(0)), b.push(f));
       c.tag = this.tag.get(f);
     }
   }
@@ -1897,7 +1947,7 @@ u.mount = function(a) {
     h.id = a.id;
     c[e] = h.mount(f);
     f.document = !0;
-    e ? f.Y = !0 : f.store = this.store;
+    e ? f.W = !0 : f.store = this.store;
   }
   this.db = this.async = !0;
   return Promise.all(c);
@@ -1908,7 +1958,7 @@ u.commit = async function(a, b) {
     c.push(d.db.commit(d, a, b));
   }
   await Promise.all(c);
-  this.A.clear();
+  this.reg.clear();
 };
 function Va(a, b) {
   const c = a.split(":");
@@ -1930,7 +1980,7 @@ u.remove = function(a) {
   for (var b of this.index.values()) {
     b.remove(a, !0);
   }
-  if (this.A.has(a)) {
+  if (this.reg.has(a)) {
     if (this.tag && !this.fastupdate) {
       for (let c of this.tag.values()) {
         for (let d of c) {
@@ -1941,7 +1991,7 @@ u.remove = function(a) {
       }
     }
     this.store && this.store.delete(a);
-    this.A.delete(a);
+    this.reg.delete(a);
   }
   this.cache && this.cache.remove(a);
   return this;
@@ -1959,7 +2009,7 @@ u.clear = function() {
   return this;
 };
 u.contain = function(a) {
-  return this.db ? this.index.get(this.field[0]).db.has(a) : this.A.has(a);
+  return this.db ? this.index.get(this.field[0]).db.has(a) : this.reg.has(a);
 };
 u.cleanup = function() {
   for (const a of this.index.values()) {
@@ -2017,9 +2067,9 @@ u.import = function(a, b) {
         break;
       case "reg":
         this.fastupdate = !1;
-        this.A = b;
+        this.reg = b;
         for (let d = 0, e; d < this.field.length; d++) {
-          e = this.index[this.field[d]], e.A = b, e.fastupdate = !1;
+          e = this.index[this.field[d]], e.reg = b, e.fastupdate = !1;
         }
         break;
       case "store":
@@ -2043,7 +2093,7 @@ function Ya(a, b = {}) {
   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.Z = !1;
+  this.X = !1;
   this.db = null;
   this.h = {};
 }
@@ -2183,22 +2233,22 @@ u.transaction = function(a, b, c) {
 };
 u.commit = async function(a, b, c) {
   if (b) {
-    await this.clear(), a.K = [];
+    await this.clear(), a.I = [];
   } else {
-    let d = a.K;
-    a.K = [];
+    let d = a.I;
+    a.I = [];
     for (let e = 0, f; e < d.length; e++) {
       if (f = d[e], f.clear) {
         await this.clear();
         b = !0;
         break;
       } else {
-        d[e] = f.$;
+        d[e] = f.Y;
       }
     }
-    b || (c || (d = d.concat(ba(a.A))), d.length && await this.remove(d));
+    b || (c || (d = d.concat(ba(a.reg))), d.length && await this.remove(d));
   }
-  a.A.size && (await this.transaction("map", "readwrite", function(d) {
+  a.reg.size && (await this.transaction("map", "readwrite", function(d) {
     for (const e of a.map) {
       const f = e[0], g = e[1];
       g.length && (b ? d.put(g, f) : d.get(f).onsuccess = function() {
@@ -2225,7 +2275,7 @@ u.commit = async function(a, b, c) {
       });
     }
   }), await this.transaction("ctx", "readwrite", function(d) {
-    for (const e of a.F) {
+    for (const e of a.ctx) {
       const f = e[0], g = e[1];
       for (const h of g) {
         const k = h[0], l = h[1];
@@ -2258,8 +2308,8 @@ u.commit = async function(a, b, c) {
       const f = e[0], g = e[1];
       d.put("object" === typeof g ? JSON.stringify(g) : 1, f);
     }
-  }) : a.Y || await this.transaction("reg", "readwrite", function(d) {
-    for (const e of a.A.keys()) {
+  }) : a.W || await this.transaction("reg", "readwrite", function(d) {
+    for (const e of a.reg.keys()) {
       d.put(1, e);
     }
   }), a.tag && await this.transaction("tag", "readwrite", function(d) {
@@ -2271,7 +2321,7 @@ u.commit = async function(a, b, c) {
         d.put(h, f);
       });
     }
-  }), a.map.clear(), a.F.clear(), a.tag && a.tag.clear(), a.store && a.store.clear(), a.document || a.A.clear());
+  }), a.map.clear(), a.ctx.clear(), a.tag && a.tag.clear(), a.store && a.store.clear(), a.document || a.reg.clear());
 };
 function ab(a, b, c) {
   const d = a.value;
diff --git a/dist/flexsearch.bundle.module.min.js b/dist/flexsearch.bundle.module.min.js
index acb2e7f..243d45d 100644
--- a/dist/flexsearch.bundle.module.min.js
+++ b/dist/flexsearch.bundle.module.min.js
@@ -15,75 +15,77 @@ function B(a){return"string"===typeof a}function C(a){return"object"===typeof a}
 ["\u0477","\u0475"],["\u04c2","\u0436"],["\u04d1","\u0430"],["\u04d3","\u0430"],["\u04d7","\u0435"],["\u04db","\u04d9"],["\u04dd","\u0436"],["\u04df","\u0437"],["\u04e3","\u0438"],["\u04e5","\u0438"],["\u04e7","\u043e"],["\u04eb","\u04e9"],["\u04ed","\u044d"],["\u04ef","\u0443"],["\u04f1","\u0443"],["\u04f3","\u0443"],["\u04f5","\u0447"]];const fa=/[^\p{L}\p{N}]+/u,ha=/(\d{3})/g,ia=/(\D)(\d{3})/g,ja=/(\d{3})(\D)/g,ka="".normalize&&/[\u0300-\u036f]/g;function F(a){if(!this)return new F(...arguments);for(let b=0;b<arguments.length;b++)this.assign(arguments[b])}
 F.prototype.assign=function(a){this.normalize=y(a.normalize,!0,this.normalize);let b=a.include,c=b||a.exclude||a.split;if("object"===typeof c){let d=!b,e="";a.include||(e+="\\p{Z}");c.letter&&(e+="\\p{L}");c.number&&(e+="\\p{N}",d=!!b);c.symbol&&(e+="\\p{S}");c.punctuation&&(e+="\\p{P}");c.control&&(e+="\\p{C}");if(c=c.char)e+="object"===typeof c?c.join(""):c;this.split=new RegExp("["+(b?"^":"")+e+"]+","u");this.numeric=d}else this.split=y(c,fa,this.split),this.numeric=y(this.numeric,!0);this.prepare=
 y(a.prepare,null,this.prepare);this.finalize=y(a.finalize,null,this.finalize);ka||(this.mapper=new Map(ea));this.rtl=a.rtl||!1;this.dedupe=y(a.dedupe,!0,this.dedupe);this.filter=y((c=a.filter)&&new Set(c),null,this.filter);this.matcher=y((c=a.matcher)&&new Map(c),null,this.matcher);this.mapper=y((c=a.mapper)&&new Map(c),null,this.mapper);this.stemmer=y((c=a.stemmer)&&new Map(c),null,this.stemmer);this.replacer=y(a.replacer,null,this.replacer);this.minlength=y(a.minlength,1,this.minlength);this.maxlength=
-y(a.maxlength,0,this.maxlength);if(this.cache=c=y(a.cache,!0,this.cache))this.O=null,this.V="number"===typeof c?c:2E5,this.J=new Map,this.M=new Map,this.B=this.h=128;this.C="";this.S=null;this.P="";this.T=null;if(this.matcher)for(const d of this.matcher.keys())this.C+=(this.C?"|":"")+d;if(this.stemmer)for(const d of this.stemmer.keys())this.P+=(this.P?"|":"")+d;return this};
-F.prototype.encode=function(a){if(this.cache&&a.length<=this.h)if(this.O){if(this.J.has(a))return this.J.get(a)}else this.O=setTimeout(la,0,this);this.normalize&&(a="function"===typeof this.normalize?this.normalize(a):ka?a.normalize("NFKD").replace(ka,"").toLowerCase():a.toLowerCase());this.prepare&&(a=this.prepare(a));this.numeric&&3<a.length&&(a=a.replace(ia,"$1 $2").replace(ja,"$1 $2").replace(ha,"$1 "));const b=!(this.dedupe||this.mapper||this.filter||this.matcher||this.stemmer||this.replacer);
-let c=[],d=this.split||""===this.split?a.split(this.split):a;for(let f=0,g,h;f<d.length;f++){if(!(g=h=d[f]))continue;if(g.length<this.minlength)continue;if(b){c.push(g);continue}if(this.filter&&this.filter.has(g))continue;if(this.cache&&g.length<=this.B)if(this.O){var e=this.M.get(g);if(e||""===e){e&&c.push(e);continue}}else this.O=setTimeout(la,0,this);let k;this.stemmer&&2<g.length&&(this.T||(this.T=new RegExp("(?!^)("+this.P+")$")),g=g.replace(this.T,l=>this.stemmer.get(l)),k=1);this.matcher&&
-1<g.length&&(this.S||(this.S=new RegExp("("+this.C+")","g")),g=g.replace(this.S,l=>this.matcher.get(l)),k=1);g&&k&&(g.length<this.minlength||this.filter&&this.filter.has(g))&&(g="");if(g&&(this.mapper||this.dedupe&&1<g.length)){e="";for(let l=0,m="",n,q;l<g.length;l++)n=g.charAt(l),n===m&&this.dedupe||((q=this.mapper&&this.mapper.get(n))||""===q?q===m&&this.dedupe||!(m=q)||(e+=q):e+=m=n);g=e}if(g&&this.replacer)for(e=0;g&&e<this.replacer.length;e+=2)g=g.replace(this.replacer[e],this.replacer[e+1]);
-this.cache&&h.length<=this.B&&(this.M.set(h,g),this.M.size>this.V&&(this.M.clear(),this.B=this.B/1.1|0));g&&c.push(g)}this.finalize&&(c=this.finalize(c)||c);this.cache&&a.length<=this.h&&(this.J.set(a,c),this.J.size>this.V&&(this.J.clear(),this.h=this.h/1.1|0));return c};function la(a){a.O=null;a.J.clear();a.M.clear()};function ma(a,b,c){a=("object"===typeof a?""+a.query:a).toLowerCase();let d=this.cache.get(a);if(!d){d=this.search(a,b,c);if(d.then){const e=this;d.then(function(f){e.cache.set(a,f);return f})}this.cache.set(a,d)}return d}function G(a){this.limit=a&&!0!==a?a:1E3;this.cache=new Map;this.h=""}G.prototype.set=function(a,b){this.cache.set(this.h=a,b);this.cache.size>this.limit&&this.cache.delete(this.cache.keys().next().value)};
+y(a.maxlength,0,this.maxlength);if(this.cache=c=y(a.cache,!0,this.cache))this.M=null,this.T="number"===typeof c?c:2E5,this.H=new Map,this.K=new Map,this.A=this.h=128;this.B="";this.P=null;this.N="";this.R=null;if(this.matcher)for(const d of this.matcher.keys())this.B+=(this.B?"|":"")+d;if(this.stemmer)for(const d of this.stemmer.keys())this.N+=(this.N?"|":"")+d;return this};
+F.prototype.encode=function(a){if(this.cache&&a.length<=this.h)if(this.M){if(this.H.has(a))return this.H.get(a)}else this.M=setTimeout(la,0,this);this.normalize&&(a="function"===typeof this.normalize?this.normalize(a):ka?a.normalize("NFKD").replace(ka,"").toLowerCase():a.toLowerCase());this.prepare&&(a=this.prepare(a));this.numeric&&3<a.length&&(a=a.replace(ia,"$1 $2").replace(ja,"$1 $2").replace(ha,"$1 "));const b=!(this.dedupe||this.mapper||this.filter||this.matcher||this.stemmer||this.replacer);
+let c=[],d=this.split||""===this.split?a.split(this.split):a;for(let f=0,g,h;f<d.length;f++){if(!(g=h=d[f]))continue;if(g.length<this.minlength)continue;if(b){c.push(g);continue}if(this.filter&&this.filter.has(g))continue;if(this.cache&&g.length<=this.A)if(this.M){var e=this.K.get(g);if(e||""===e){e&&c.push(e);continue}}else this.M=setTimeout(la,0,this);let k;this.stemmer&&2<g.length&&(this.R||(this.R=new RegExp("(?!^)("+this.N+")$")),g=g.replace(this.R,l=>this.stemmer.get(l)),k=1);this.matcher&&
+1<g.length&&(this.P||(this.P=new RegExp("("+this.B+")","g")),g=g.replace(this.P,l=>this.matcher.get(l)),k=1);g&&k&&(g.length<this.minlength||this.filter&&this.filter.has(g))&&(g="");if(g&&(this.mapper||this.dedupe&&1<g.length)){e="";for(let l=0,m="",n,q;l<g.length;l++)n=g.charAt(l),n===m&&this.dedupe||((q=this.mapper&&this.mapper.get(n))||""===q?q===m&&this.dedupe||!(m=q)||(e+=q):e+=m=n);g=e}if(g&&this.replacer)for(e=0;g&&e<this.replacer.length;e+=2)g=g.replace(this.replacer[e],this.replacer[e+1]);
+this.cache&&h.length<=this.A&&(this.K.set(h,g),this.K.size>this.T&&(this.K.clear(),this.A=this.A/1.1|0));g&&c.push(g)}this.finalize&&(c=this.finalize(c)||c);this.cache&&a.length<=this.h&&(this.H.set(a,c),this.H.size>this.T&&(this.H.clear(),this.h=this.h/1.1|0));return c};function la(a){a.M=null;a.H.clear();a.K.clear()};function ma(a,b,c){a=("object"===typeof a?""+a.query:a).toLowerCase();let d=this.cache.get(a);if(!d){d=this.search(a,b,c);if(d.then){const e=this;d.then(function(f){e.cache.set(a,f);return f})}this.cache.set(a,d)}return d}function G(a){this.limit=a&&!0!==a?a:1E3;this.cache=new Map;this.h=""}G.prototype.set=function(a,b){this.cache.set(this.h=a,b);this.cache.size>this.limit&&this.cache.delete(this.cache.keys().next().value)};
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+u.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()};function Va(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))&&(b[d]=!0),a&&(c[d++]=a);d<c.length&&(c.length=d);return 1<d?c:c[0]}u.append=function(a,b){return this.add(a,b,!0)};u.update=function(a,b){return this.remove(a).add(a,b)};
+u.remove=function(a){C(a)&&(a=ca(a,this.key));for(var b of this.index.values())b.remove(a,!0);if(this.reg.has(a)){if(this.tag&&!this.fastupdate)for(let c of this.tag.values())for(let d of c){b=d[0];const e=d[1],f=e.indexOf(a);-1<f&&(1<e.length?e.splice(f,1):c.delete(b))}this.store&&this.store.delete(a);this.reg.delete(a)}this.cache&&this.cache.remove(a);return this};
+u.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};u.contain=function(a){return this.db?this.index.get(this.field[0]).db.has(a):this.reg.has(a)};u.cleanup=function(){for(const a of this.index.values())a.cleanup();return this};u.get=function(a){return this.db?this.index.get(this.field[0]).db.enrich(a).then(function(b){return b[0]&&b[0].doc}):this.store.get(a)};
 u.set=function(a,b){this.store.set(a,b);return this};u.searchCache=ma;u.export=function(a,b,c,d,e,f){let g;"undefined"===typeof f&&(g=new Promise(k=>{f=k}));e||(e=0);d||(d=0);if(d<this.field.length){c=this.field[d];var h=this.index[c];b=this;h.export(a,b,e?c:"",d,e++,f)||(d++,b.export(a,b,c,d,1,f))}else{switch(e){case 1:b="tag";h=this.h;c=null;break;case 2:b="store";h=this.store;c=null;break;default:f();return}za(a,this,c,b,d,e,h,f)}return g};
-u.import=function(a,b){if(b)switch(B(b)&&(b=JSON.parse(b)),a){case "tag":this.h=b;break;case "reg":this.fastupdate=!1;this.A=b;for(let d=0,e;d<this.field.length;d++)e=this.index[this.field[d]],e.A=b,e.fastupdate=!1;break;case "store":this.store=b;break;default:a=a.split(".");const c=a[0];a=a[1];c&&a&&this.index[c].import(a,b)}};Ba(Y.prototype);const Wa="undefined"!==typeof window&&(window.indexedDB||window.mozIndexedDB||window.webkitIndexedDB||window.msIndexedDB),Xa=["map","ctx","tag","reg","cfg"];
-function Ya(a,b={}){if(!this)return new Ya(a,b);"object"===typeof a&&(b=a=a.name);a||console.info("Default storage space was used, because a name was not passed.");this.id="flexsearch"+(a?":"+a.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"");this.field=b.field?b.field.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"";this.Z=!1;this.db=null;this.h={}}u=Ya.prototype;u.mount=function(a){if(a.constructor===Y)return a.mount(this);a.db=this;return $a(this)};
+u.import=function(a,b){if(b)switch(B(b)&&(b=JSON.parse(b)),a){case "tag":this.h=b;break;case "reg":this.fastupdate=!1;this.reg=b;for(let d=0,e;d<this.field.length;d++)e=this.index[this.field[d]],e.reg=b,e.fastupdate=!1;break;case "store":this.store=b;break;default:a=a.split(".");const c=a[0];a=a[1];c&&a&&this.index[c].import(a,b)}};Ba(Y.prototype);const Wa="undefined"!==typeof window&&(window.indexedDB||window.mozIndexedDB||window.webkitIndexedDB||window.msIndexedDB),Xa=["map","ctx","tag","reg","cfg"];
+function Ya(a,b={}){if(!this)return new Ya(a,b);"object"===typeof a&&(b=a=a.name);a||console.info("Default storage space was used, because a name was not passed.");this.id="flexsearch"+(a?":"+a.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"");this.field=b.field?b.field.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"";this.X=!1;this.db=null;this.h={}}u=Ya.prototype;u.mount=function(a){if(a.constructor===Y)return a.mount(this);a.db=this;return $a(this)};
 function $a(a){navigator.storage&&navigator.storage.persist();return a.db||new Promise(function(b,c){const d=Wa.open(a.id+(a.field?":"+a.field:""),1);d.onupgradeneeded=function(){const e=a.db=this.result;Xa.forEach(f=>{e.objectStoreNames.contains(f)||e.createObjectStore(f)})};d.onblocked=function(e){console.error("blocked",e);c()};d.onerror=function(e){console.error(this.error,e);c()};d.onsuccess=function(){a.db=this.result;a.db.onversionchange=function(){a.close()};b(a)}})}
 u.close=function(){this.db.close();this.db=null};u.clear=function(){const a=this.db.transaction(Xa,"readwrite");for(let b=0;b<Xa.length;b++)a.objectStore(Xa[b]).clear();return Z(a)};
 u.get=function(a,b,c=0,d=0,e=!0,f=!1){a=this.db.transaction(b?"ctx":"map","readonly").objectStore(b?"ctx":"map").get(b?b+":"+a:a);const g=this;return Z(a).then(function(h){let k=[];if(!h||!h.length)return k;if(e){if(!c&&!d&&1===h.length)return h[0];for(let l=0,m;l<h.length;l++)if((m=h[l])&&m.length){if(d>=m.length){d-=m.length;continue}const n=c?d+Math.min(m.length-d,c):m.length;for(let q=d;q<n;q++)k.push(m[q]);d=0;if(k.length===c)break}return f?g.enrich(k):k}return h})};
 u.tag=function(a,b=0,c=0,d=!1){a=this.db.transaction("tag","readonly").objectStore("tag").get(a);const e=this;return Z(a).then(function(f){if(!f||!f.length||c>=f.length)return[];if(!b&&!c)return f;f=f.slice(c,c+b);return d?e.enrich(f):f})};
 u.enrich=function(a){"object"!==typeof a&&(a=[a]);const b=this.db.transaction("reg","readonly").objectStore("reg"),c=[];for(let d=0;d<a.length;d++)c[d]=Z(b.get(a[d]));return Promise.all(c).then(function(d){for(let e=0;e<d.length;e++)d[e]={id:a[e],doc:d[e]?JSON.parse(d[e]):null};return d})};u.has=function(a){a=this.db.transaction("reg","readonly").objectStore("reg").getKey(a);return Z(a)};u.search=null;u.info=function(){};
 u.transaction=function(a,b,c){let d=this.h[a+":"+b];if(d)return c.call(this,d);let e=this.db.transaction(a,b);this.h[a+":"+b]=d=e.objectStore(a);return new Promise((f,g)=>{e.onerror=h=>{this.h[a+":"+b]=null;e.abort();e=d=null;g(h)};e.oncomplete=h=>{e=d=this.h[a+":"+b]=null;f(h||!0)};return c.call(this,d)})};
-u.commit=async function(a,b,c){if(b)await this.clear(),a.K=[];else{let d=a.K;a.K=[];for(let e=0,f;e<d.length;e++)if(f=d[e],f.clear){await this.clear();b=!0;break}else d[e]=f.$;b||(c||(d=d.concat(ba(a.A))),d.length&&await this.remove(d))}a.A.size&&(await this.transaction("map","readwrite",function(d){for(const e of a.map){const f=e[0],g=e[1];g.length&&(b?d.put(g,f):d.get(f).onsuccess=function(){let h=this.result;var k;if(h&&h.length){const l=Math.max(h.length,g.length);for(let m=0,n,q;m<l;m++)if((q=
-g[m])&&q.length){if((n=h[m])&&n.length)for(k=0;k<q.length;k++)n.push(q[k]);else h[m]=q;k=1}}else h=g,k=1;k&&d.put(h,f)})}}),await this.transaction("ctx","readwrite",function(d){for(const e of a.F){const f=e[0],g=e[1];for(const h of g){const k=h[0],l=h[1];l.length&&(b?d.put(l,f+":"+k):d.get(f+":"+k).onsuccess=function(){let m=this.result;var n;if(m&&m.length){const q=Math.max(m.length,l.length);for(let r=0,p,t;r<q;r++)if((t=l[r])&&t.length){if((p=m[r])&&p.length)for(n=0;n<t.length;n++)p.push(t[n]);
-else m[r]=t;n=1}}else m=l,n=1;n&&d.put(m,f+":"+k)})}}}),a.store?await this.transaction("reg","readwrite",function(d){for(const e of a.store){const f=e[0],g=e[1];d.put("object"===typeof g?JSON.stringify(g):1,f)}}):a.Y||await this.transaction("reg","readwrite",function(d){for(const e of a.A.keys())d.put(1,e)}),a.tag&&await this.transaction("tag","readwrite",function(d){for(const e of a.tag){const f=e[0],g=e[1];g.length&&(d.get(f).onsuccess=function(){let h=this.result;h=h&&h.length?h.concat(g):g;d.put(h,
-f)})}}),a.map.clear(),a.F.clear(),a.tag&&a.tag.clear(),a.store&&a.store.clear(),a.document||a.A.clear())};function ab(a,b,c){const d=a.value;let e,f,g=0;for(let h=0,k;h<d.length;h++){if(k=c?d:d[h]){for(let l=0,m,n;l<b.length;l++)if(n=b[l],m=k.indexOf(f?parseInt(n,10):n),0>m&&!f&&"string"===typeof n&&!isNaN(n)&&(m=k.indexOf(parseInt(n,10)))&&(f=1),0<=m)if(e=1,1<k.length)k.splice(m,1);else{d[h]=[];break}g+=k.length}if(c)break}g?e&&a.update(d):a.delete();a.continue()}
+u.commit=async function(a,b,c){if(b)await this.clear(),a.I=[];else{let d=a.I;a.I=[];for(let e=0,f;e<d.length;e++)if(f=d[e],f.clear){await this.clear();b=!0;break}else d[e]=f.Y;b||(c||(d=d.concat(ba(a.reg))),d.length&&await this.remove(d))}a.reg.size&&(await this.transaction("map","readwrite",function(d){for(const e of a.map){const f=e[0],g=e[1];g.length&&(b?d.put(g,f):d.get(f).onsuccess=function(){let h=this.result;var k;if(h&&h.length){const l=Math.max(h.length,g.length);for(let m=0,n,q;m<l;m++)if((q=
+g[m])&&q.length){if((n=h[m])&&n.length)for(k=0;k<q.length;k++)n.push(q[k]);else h[m]=q;k=1}}else h=g,k=1;k&&d.put(h,f)})}}),await this.transaction("ctx","readwrite",function(d){for(const e of a.ctx){const f=e[0],g=e[1];for(const h of g){const k=h[0],l=h[1];l.length&&(b?d.put(l,f+":"+k):d.get(f+":"+k).onsuccess=function(){let m=this.result;var n;if(m&&m.length){const q=Math.max(m.length,l.length);for(let r=0,p,t;r<q;r++)if((t=l[r])&&t.length){if((p=m[r])&&p.length)for(n=0;n<t.length;n++)p.push(t[n]);
+else m[r]=t;n=1}}else m=l,n=1;n&&d.put(m,f+":"+k)})}}}),a.store?await this.transaction("reg","readwrite",function(d){for(const e of a.store){const f=e[0],g=e[1];d.put("object"===typeof g?JSON.stringify(g):1,f)}}):a.W||await this.transaction("reg","readwrite",function(d){for(const e of a.reg.keys())d.put(1,e)}),a.tag&&await this.transaction("tag","readwrite",function(d){for(const e of a.tag){const f=e[0],g=e[1];g.length&&(d.get(f).onsuccess=function(){let h=this.result;h=h&&h.length?h.concat(g):g;
+d.put(h,f)})}}),a.map.clear(),a.ctx.clear(),a.tag&&a.tag.clear(),a.store&&a.store.clear(),a.document||a.reg.clear())};function ab(a,b,c){const d=a.value;let e,f,g=0;for(let h=0,k;h<d.length;h++){if(k=c?d:d[h]){for(let l=0,m,n;l<b.length;l++)if(n=b[l],m=k.indexOf(f?parseInt(n,10):n),0>m&&!f&&"string"===typeof n&&!isNaN(n)&&(m=k.indexOf(parseInt(n,10)))&&(f=1),0<=m)if(e=1,1<k.length)k.splice(m,1);else{d[h]=[];break}g+=k.length}if(c)break}g?e&&a.update(d):a.delete();a.continue()}
 u.remove=function(a){"object"!==typeof a&&(a=[a]);return Promise.all([this.transaction("map","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&ab(c,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&ab(c,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&ab(c,a,!0)}}),this.transaction("reg","readwrite",function(b){for(let c=0;c<a.length;c++)b.delete(a[c])})])};
 function Z(a){return new Promise((b,c)=>{a.onsuccess=function(){b(this.result)};a.oncomplete=function(){b(this.result)};a.onerror=c;a=null})};export default {Index:O,Charset:va,Encoder:F,Document:Y,Worker:W,Resolver:S,IndexedDB:Ya,Language:{}};
 export const Index=O;export const Charset=va;export const Encoder=F;export const Document=Y;export const Worker=W;export const Resolver=S;export const IndexedDB=Ya;export const Language={};
\ No newline at end of file
diff --git a/dist/flexsearch.compact.debug.js b/dist/flexsearch.compact.debug.js
index c7ebb66..43d57e7 100644
--- a/dist/flexsearch.compact.debug.js
+++ b/dist/flexsearch.compact.debug.js
@@ -115,32 +115,32 @@ J.prototype.assign = function(a) {
   this.minlength = x(a.minlength, 1, this.minlength);
   this.maxlength = x(a.maxlength, 0, this.maxlength);
   if (this.cache = b = x(a.cache, !0, this.cache)) {
-    this.L = null, this.R = "number" === typeof b ? b : 2e5, this.H = new Map(), this.J = new Map(), this.G = this.A = 128;
+    this.J = null, this.O = "number" === typeof b ? b : 2e5, this.F = new Map(), this.H = new Map(), this.D = this.h = 128;
   }
-  this.M = "";
-  this.O = null;
-  this.N = "";
-  this.P = null;
+  this.K = "";
+  this.M = null;
+  this.L = "";
+  this.N = null;
   if (this.matcher) {
     for (const e of this.matcher.keys()) {
-      this.M += (this.M ? "|" : "") + e;
+      this.K += (this.K ? "|" : "") + e;
     }
   }
   if (this.stemmer) {
     for (const e of this.stemmer.keys()) {
-      this.N += (this.N ? "|" : "") + e;
+      this.L += (this.L ? "|" : "") + e;
     }
   }
   return this;
 };
 J.prototype.encode = function(a) {
-  if (this.cache && a.length <= this.A) {
-    if (this.L) {
-      if (this.H.has(a)) {
-        return this.H.get(a);
+  if (this.cache && a.length <= this.h) {
+    if (this.J) {
+      if (this.F.has(a)) {
+        return this.F.get(a);
       }
     } else {
-      this.L = setTimeout(ha, 0, this);
+      this.J = setTimeout(ha, 0, this);
     }
   }
   this.normalize && (a = "function" === typeof this.normalize ? this.normalize(a) : I ? a.normalize("NFKD").replace(I, "").toLowerCase() : a.toLowerCase());
@@ -162,25 +162,25 @@ J.prototype.encode = function(a) {
     if (this.filter && this.filter.has(g)) {
       continue;
     }
-    if (this.cache && g.length <= this.G) {
-      if (this.L) {
-        var d = this.J.get(g);
+    if (this.cache && g.length <= this.D) {
+      if (this.J) {
+        var d = this.H.get(g);
         if (d || "" === d) {
           d && b.push(d);
           continue;
         }
       } else {
-        this.L = setTimeout(ha, 0, this);
+        this.J = setTimeout(ha, 0, this);
       }
     }
     let k;
-    this.stemmer && 2 < g.length && (this.P || (this.P = new RegExp("(?!^)(" + this.N + ")$")), g = g.replace(this.P, l => this.stemmer.get(l)), k = 1);
-    this.matcher && 1 < g.length && (this.O || (this.O = new RegExp("(" + this.M + ")", "g")), g = g.replace(this.O, l => this.matcher.get(l)), k = 1);
+    this.stemmer && 2 < g.length && (this.N || (this.N = new RegExp("(?!^)(" + this.L + ")$")), g = g.replace(this.N, l => this.stemmer.get(l)), k = 1);
+    this.matcher && 1 < g.length && (this.M || (this.M = new RegExp("(" + this.K + ")", "g")), g = g.replace(this.M, l => this.matcher.get(l)), k = 1);
     g && k && (g.length < this.minlength || this.filter && this.filter.has(g)) && (g = "");
     if (g && (this.mapper || this.dedupe && 1 < g.length)) {
       d = "";
-      for (let l = 0, m = "", r, t; l < g.length; l++) {
-        r = g.charAt(l), r === m && this.dedupe || ((t = this.mapper && this.mapper.get(r)) || "" === t ? t === m && this.dedupe || !(m = t) || (d += t) : d += m = r);
+      for (let l = 0, m = "", q, t; l < g.length; l++) {
+        q = g.charAt(l), q === m && this.dedupe || ((t = this.mapper && this.mapper.get(q)) || "" === t ? t === m && this.dedupe || !(m = t) || (d += t) : d += m = q);
       }
       g = d;
     }
@@ -189,17 +189,17 @@ J.prototype.encode = function(a) {
         g = g.replace(this.replacer[d], this.replacer[d + 1]);
       }
     }
-    this.cache && h.length <= this.G && (this.J.set(h, g), this.J.size > this.R && (this.J.clear(), this.G = this.G / 1.1 | 0));
+    this.cache && h.length <= this.D && (this.H.set(h, g), this.H.size > this.O && (this.H.clear(), this.D = this.D / 1.1 | 0));
     g && b.push(g);
   }
   this.finalize && (b = this.finalize(b) || b);
-  this.cache && a.length <= this.A && (this.H.set(a, b), this.H.size > this.R && (this.H.clear(), this.A = this.A / 1.1 | 0));
+  this.cache && a.length <= this.h && (this.F.set(a, b), this.F.size > this.O && (this.F.clear(), this.h = this.h / 1.1 | 0));
   return b;
 };
 function ha(a) {
-  a.L = null;
+  a.J = null;
+  a.F.clear();
   a.H.clear();
-  a.J.clear();
 }
 ;function ia(a, c, b) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
@@ -220,15 +220,15 @@ function ha(a) {
 function K(a) {
   this.limit = a && !0 !== a ? a : 1000;
   this.cache = new Map();
-  this.A = "";
+  this.h = "";
 }
 K.prototype.set = function(a, c) {
-  this.cache.set(this.A = a, c);
+  this.cache.set(this.h = a, c);
   this.cache.size > this.limit && this.cache.delete(this.cache.keys().next().value);
 };
 K.prototype.get = function(a) {
   const c = this.cache.get(a);
-  c && this.A !== a && (this.cache.delete(a), this.cache.set(this.A = a, c));
+  c && this.h !== a && (this.cache.delete(a), this.cache.set(this.h = a, c));
   return c;
 };
 K.prototype.remove = function(a) {
@@ -239,7 +239,7 @@ K.prototype.remove = function(a) {
 };
 K.prototype.clear = function() {
   this.cache.clear();
-  this.A = "";
+  this.h = "";
 };
 const ja = {normalize:function(a) {
   return a.toLowerCase();
@@ -294,16 +294,16 @@ function M(a) {
 ;y();
 N.prototype.add = function(a, c, b, e) {
   if (c && (a || 0 === a)) {
-    if (!e && !b && this.h.has(a)) {
+    if (!e && !b && this.reg.has(a)) {
       return this.update(a, c);
     }
     c = this.encoder.encode(c);
     if (e = c.length) {
-      const l = y(), m = y(), r = this.depth, t = this.resolution;
+      const l = y(), m = y(), q = this.depth, t = this.resolution;
       for (let p = 0; p < e; p++) {
         let n = c[this.rtl ? e - 1 - p : p];
         var d = n.length;
-        if (d && (r || !m[n])) {
+        if (d && (q || !m[n])) {
           var f = this.score ? this.score(c, n, p, null, 0) : O(t, e, p), g = "";
           switch(this.tokenize) {
             case "full":
@@ -332,8 +332,8 @@ N.prototype.add = function(a, c, b, e) {
                 break;
               }
             default:
-              if (P(this, m, n, f, a, b), r && 1 < e && p < e - 1) {
-                for (d = y(), g = this.S, f = n, h = Math.min(r + 1, e - p), d[f] = 1, k = 1; k < h; k++) {
+              if (P(this, m, n, f, a, b), q && 1 < e && p < e - 1) {
+                for (d = y(), g = this.P, f = n, h = Math.min(q + 1, e - p), d[f] = 1, k = 1; k < h; k++) {
                   if ((n = c[this.rtl ? e - 1 - p - k : p + k]) && !d[n]) {
                     d[n] = 1;
                     const w = this.score ? this.score(c, f, p, n, k) : O(g + (e / 2 > g ? 0 : 1), e, p, h - 1, k - 1), B = this.bidirectional && n > f;
@@ -344,14 +344,14 @@ N.prototype.add = function(a, c, b, e) {
           }
         }
       }
-      this.fastupdate || this.h.add(a);
+      this.fastupdate || this.reg.add(a);
     }
   }
   return this;
 };
 function P(a, c, b, e, d, f, g) {
-  let h = g ? a.D : a.map, k;
-  c[b] && g && (k = c[b])[g] || (g ? (c = k || (c[b] = y()), c[g] = 1, (k = h.get(g)) ? h = k : h.set(g, h = new Map())) : c[b] = 1, (k = h.get(b)) ? h = k : h.set(b, h = []), h = h[e] || (h[e] = []), f && h.includes(d) || (h.push(d), a.fastupdate && ((c = a.h.get(d)) ? c.push(h) : a.h.set(d, [h]))));
+  let h = g ? a.ctx : a.map, k;
+  c[b] && g && (k = c[b])[g] || (g ? (c = k || (c[b] = y()), c[g] = 1, (k = h.get(g)) ? h = k : h.set(g, h = new Map())) : c[b] = 1, (k = h.get(b)) ? h = k : h.set(b, h = []), h = h[e] || (h[e] = []), f && h.includes(d) || (h.push(d), a.fastupdate && ((c = a.reg.get(d)) ? c.push(h) : a.reg.set(d, [h]))));
 }
 function O(a, c, b, e, d) {
   return b && 1 < a ? c + (e || 0) <= a ? b + (d || 0) : (a - 1) / (c + (e || 0)) * (b + (d || 0)) + 1 | 0 : 0;
@@ -422,11 +422,11 @@ function O(a, c, b, e, d) {
   var h = 0, k = 0;
   if (1 < b) {
     var l = y();
-    const r = [];
+    const q = [];
     for (let t = 0, p; t < b; t++) {
       if ((p = a[t]) && !l[p]) {
         if (g || S(this, p)) {
-          r.push(p), l[p] = 1;
+          q.push(p), l[p] = 1;
         } else {
           return e;
         }
@@ -435,7 +435,7 @@ function O(a, c, b, e, d) {
         k = k ? Math.min(k, n) : n;
       }
     }
-    a = r;
+    a = q;
     b = a.length;
   }
   if (!b) {
@@ -456,11 +456,11 @@ function O(a, c, b, e, d) {
       9 < h && 3 < h / k && a.sort(aa);
     }
   }
-  for (let r, t; l < b; l++) {
+  for (let q, t; l < b; l++) {
     t = a[l];
-    m ? (r = S(this, t, m), r = va(r, e, g, this.S, c, d, 2 === b), g && !1 === r && e.length || (m = t)) : (r = S(this, t), r = va(r, e, g, this.resolution, c, d, 1 === b));
-    if (r) {
-      return r;
+    m ? (q = S(this, t, m), q = va(q, e, g, this.P, c, d, 2 === b), g && !1 === q && e.length || (m = t)) : (q = S(this, t), q = va(q, e, g, this.resolution, c, d, 1 === b));
+    if (q) {
+      return q;
     }
     if (g && l === b - 1) {
       f = e.length;
@@ -483,9 +483,9 @@ function O(a, c, b, e, d) {
     m = a.length;
     b = [];
     f = y();
-    for (let r = 0, t, p, n, w; r < e; r++) {
+    for (let q = 0, t, p, n, w; q < e; q++) {
       for (k = 0; k < m; k++) {
-        if (n = a[k], r < n.length && (t = n[r])) {
+        if (n = a[k], q < n.length && (t = n[q])) {
           for (l = 0; l < t.length; l++) {
             p = t[l], (h = f[p]) ? f[p]++ : (h = 0, f[p] = 1), w = b[h] || (b[h] = []), w.push(p);
           }
@@ -559,11 +559,11 @@ function va(a, c, b, e, d, f, g) {
 function S(a, c, b) {
   let e;
   b && (e = a.bidirectional && c > b);
-  a = b ? (a = a.D.get(e ? c : b)) && a.get(e ? b : c) : a.map.get(c);
+  a = b ? (a = a.ctx.get(e ? c : b)) && a.get(e ? b : c) : a.map.get(c);
   return a;
 }
 ;N.prototype.remove = function(a, c) {
-  const b = this.h.size && (this.fastupdate ? this.h.get(a) : this.h.has(a));
+  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++) {
@@ -577,9 +577,9 @@ function S(a, c, b) {
         }
       }
     } else {
-      T(this.map, a), this.depth && T(this.D, a);
+      T(this.map, a), this.depth && T(this.ctx, a);
     }
-    c || this.h.delete(a);
+    c || this.reg.delete(a);
   }
   this.cache && this.cache.remove(a);
   return this;
@@ -627,17 +627,17 @@ function T(a, c) {
   this.score = a.score || null;
   d = !1;
   this.map = new Map();
-  this.D = new Map();
-  this.h = c || (this.fastupdate ? new Map() : new Set());
-  this.S = b.resolution || 1;
+  this.ctx = new Map();
+  this.reg = c || (this.fastupdate ? new Map() : new Set());
+  this.P = b.resolution || 1;
   this.rtl = e.rtl || a.rtl || !1;
   this.cache = (d = a.cache || null) && new K(d);
 }
 u = N.prototype;
 u.clear = function() {
   this.map.clear();
-  this.D.clear();
-  this.h.clear();
+  this.ctx.clear();
+  this.reg.clear();
   this.cache && this.cache.clear();
   return this;
 };
@@ -645,7 +645,7 @@ u.append = function(a, c) {
   return this.add(a, c, !0);
 };
 u.contain = function(a) {
-  return this.h.has(a);
+  return this.reg.has(a);
 };
 u.update = function(a, c) {
   if (this.async) {
@@ -673,7 +673,7 @@ u.cleanup = function() {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
   U(this.map);
-  this.depth && U(this.D);
+  this.depth && U(this.ctx);
   return this;
 };
 u.searchCache = ia;
@@ -688,16 +688,16 @@ u.export = function(a, c, b, e, d, f) {
       h = "reg";
       if (this.fastupdate) {
         k = y();
-        for (let l of this.h.keys()) {
+        for (let l of this.reg.keys()) {
           k[l] = 1;
         }
       } else {
-        k = this.h;
+        k = this.reg;
       }
       break;
     case 1:
       h = "cfg";
-      k = {doc:0, opt:this.A ? 1 : 0};
+      k = {doc:0, opt:this.h ? 1 : 0};
       break;
     case 2:
       h = "map";
@@ -705,7 +705,7 @@ u.export = function(a, c, b, e, d, f) {
       break;
     case 3:
       h = "ctx";
-      k = this.D;
+      k = this.ctx;
       break;
     default:
       "undefined" === typeof b && f && f();
@@ -718,42 +718,92 @@ u.import = function(a, c) {
   if (c) {
     switch(z(c) && (c = JSON.parse(c)), a) {
       case "cfg":
-        this.A = !!c.opt;
+        this.h = !!c.opt;
         break;
       case "reg":
         this.fastupdate = !1;
-        this.h = c;
+        this.reg = c;
         break;
       case "map":
         this.map = c;
         break;
       case "ctx":
-        this.D = c;
+        this.ctx = c;
     }
   }
 };
+u.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], h = "";
+    for (let m = 0, q; m < g.length; m++) {
+      q = g[m] || [""];
+      var k = "";
+      for (var l = 0; l < q.length; l++) {
+        k += (k ? "," : "") + ("string" === b ? '"' + q[l] + '"' : q[l]);
+      }
+      k = "[" + k + "]";
+      h += (h ? "," : "") + k;
+    }
+    h = '["' + f + '",[' + h + "]]";
+    e += (e ? "," : "") + h;
+  }
+  e = "index.map=new Map([" + e + "]);";
+  d = "";
+  for (const m of this.ctx.entries()) {
+    f = m[0];
+    g = m[1];
+    for (const q of g.entries()) {
+      g = q[0];
+      h = q[1];
+      k = "";
+      for (let t = 0, p; t < h.length; t++) {
+        p = h[t] || [""];
+        l = "";
+        for (let n = 0; n < p.length; n++) {
+          l += (l ? "," : "") + ("string" === b ? '"' + p[n] + '"' : p[n]);
+        }
+        l = "[" + l + "]";
+        k += (k ? "," : "") + l;
+      }
+      k = 'new Map([["' + g + '",[' + k + "]]])";
+      k = '["' + f + '",' + k + "]";
+      d += (d ? "," : "") + k;
+    }
+  }
+  d = "index.ctx=new Map([" + d + "]);";
+  return a ? "function inject(index){" + c + e + d + "}" : c + e + d;
+};
 ta(N.prototype);
 V.prototype.add = function(a, c, b) {
   E(a) && (c = a, a = F(c, this.key));
   if (c && (a || 0 === a)) {
-    if (!b && this.h.has(a)) {
+    if (!b && this.reg.has(a)) {
       return this.update(a, c);
     }
     for (let h = 0, k; h < this.field.length; h++) {
-      k = this.F[h];
+      k = this.C[h];
       var e = this.index.get(this.field[h]);
       if ("function" === typeof k) {
         var d = k(c);
         d && e.add(a, d, !1, !0);
       } else {
-        if (d = k.I, !d || d(c)) {
-          k.constructor === String ? k = ["" + k] : z(k) && (k = [k]), W(c, k, this.K, 0, e, a, k[0], b);
+        if (d = k.G, !d || d(c)) {
+          k.constructor === String ? k = ["" + k] : z(k) && (k = [k]), W(c, k, this.I, 0, e, a, k[0], b);
         }
       }
     }
     if (this.tag) {
-      for (e = 0; e < this.C.length; e++) {
-        var f = this.C[e], g = this.T[e];
+      for (e = 0; e < this.B.length; e++) {
+        var f = this.B[e], g = this.R[e];
         d = this.tag.get(g);
         let h = y();
         if ("function" === typeof f) {
@@ -761,7 +811,7 @@ V.prototype.add = function(a, c, b) {
             continue;
           }
         } else {
-          const k = f.I;
+          const k = f.G;
           if (k && !k(c)) {
             continue;
           }
@@ -771,7 +821,7 @@ V.prototype.add = function(a, c, b) {
         if (d && f) {
           z(f) && (f = [f]);
           for (let k = 0, l, m; k < f.length; k++) {
-            l = f[k], h[l] || (h[l] = 1, (g = d.get(l)) ? m = g : d.set(l, m = []), b && m.includes(a) || (m.push(a), this.fastupdate && ((g = this.h.get(a)) ? g.push(m) : this.h.set(a, [m]))));
+            l = f[k], h[l] || (h[l] = 1, (g = d.get(l)) ? m = g : d.set(l, m = []), b && m.includes(a) || (m.push(a), this.fastupdate && ((g = this.reg.get(a)) ? g.push(m) : this.reg.set(a, [m]))));
           }
         } else {
           d || console.warn("Tag '" + g + "' was not found");
@@ -780,11 +830,11 @@ V.prototype.add = function(a, c, b) {
     }
     if (this.store && (!b || !this.store.has(a))) {
       let h;
-      if (this.B) {
+      if (this.A) {
         h = y();
-        for (let k = 0, l; k < this.B.length; k++) {
-          l = this.B[k];
-          if ((b = l.I) && !b(c)) {
+        for (let k = 0, l; k < this.A.length; k++) {
+          l = this.A[k];
+          if ((b = l.G) && !b(c)) {
             continue;
           }
           let m;
@@ -793,7 +843,7 @@ V.prototype.add = function(a, c, b) {
             if (!m) {
               continue;
             }
-            l = [l.U];
+            l = [l.S];
           } else if (z(l) || l.constructor === String) {
             h[l] = c[l];
             continue;
@@ -849,7 +899,7 @@ function W(a, c, b, e, d, f, g, h) {
   let d = [];
   var f = [];
   let g, h, k, l, m;
-  let r = 0;
+  let q = 0;
   if (b) {
     b.constructor === Array && (b = {index:b});
     a = b.query || a;
@@ -865,24 +915,24 @@ function W(a, c, b, e, d, f, g, h) {
     if (m) {
       m.constructor !== Array && (m = [m]);
       var n = [];
-      for (let v = 0, q; v < m.length; v++) {
-        q = m[v];
-        if (z(q)) {
+      for (let v = 0, r; v < m.length; v++) {
+        r = m[v];
+        if (z(r)) {
           throw Error("A tag option can't be a string, instead it needs a { field: tag } format.");
         }
-        if (q.field && q.tag) {
-          var w = q.tag;
+        if (r.field && r.tag) {
+          var w = r.tag;
           if (w.constructor === Array) {
             for (var B = 0; B < w.length; B++) {
-              n.push(q.field, w[B]);
+              n.push(r.field, w[B]);
             }
           } else {
-            n.push(q.field, w);
+            n.push(r.field, w);
           }
         } else {
-          w = Object.keys(q);
+          w = Object.keys(r);
           for (let C = 0, D, A; C < w.length; C++) {
-            if (D = w[C], A = q[D], A.constructor === Array) {
+            if (D = w[C], A = r[D], A.constructor === Array) {
               for (B = 0; B < A.length; B++) {
                 n.push(D, A[B]);
               }
@@ -904,8 +954,8 @@ function W(a, c, b, e, d, f, g, h) {
           }
         }
         return e.length ? Promise.all(e).then(function(v) {
-          for (let q = 0; q < v.length; q++) {
-            d[q].result = v[q];
+          for (let r = 0; r < v.length; r++) {
+            d[r].result = v[r];
           }
           return d;
         }) : d;
@@ -915,22 +965,22 @@ function W(a, c, b, e, d, f, g, h) {
   }
   l || (l = this.field);
   p = !e && (this.worker || this.async) && [];
-  for (let v = 0, q, C, D; v < l.length; v++) {
+  for (let v = 0, r, C, D; v < l.length; v++) {
     C = l[v];
     let A;
     z(C) || (A = C, C = A.field, a = A.query || a, c = A.limit || c, k = A.suggest || k);
     if (e) {
-      q = e[v];
+      r = e[v];
     } else {
       if (n = A || b, w = this.index.get(C), m && (n.enrich = !1), p) {
         p[v] = w.searchAsync(a, c, n);
         n && g && (n.enrich = g);
         continue;
       } else {
-        q = w.search(a, c, n), n && g && (n.enrich = g);
+        r = w.search(a, c, n), n && g && (n.enrich = g);
       }
     }
-    D = q && q.length;
+    D = r && r.length;
     if (m && D) {
       n = [];
       w = 0;
@@ -950,8 +1000,8 @@ function W(a, c, b, e, d, f, g, h) {
         }
       }
       if (w) {
-        q = ua(q, n);
-        D = q.length;
+        r = ua(r, n);
+        D = r.length;
         if (!D && !k) {
           return d;
         }
@@ -959,31 +1009,31 @@ function W(a, c, b, e, d, f, g, h) {
       }
     }
     if (D) {
-      f[r] = C, d.push(q), r++;
+      f[q] = C, d.push(r), q++;
     } else if (1 === l.length) {
       return d;
     }
   }
   if (p) {
     const v = this;
-    return Promise.all(p).then(function(q) {
-      return q.length ? v.search(a, c, b, q) : q;
+    return Promise.all(p).then(function(r) {
+      return r.length ? v.search(a, c, b, r) : r;
     });
   }
-  if (!r) {
+  if (!q) {
     return d;
   }
   if (t && (!g || !this.store)) {
     return d[0];
   }
   p = [];
-  for (let v = 0, q; v < f.length; v++) {
-    q = d[v];
-    g && q.length && !q[0].doc && q.length && (q = xa.call(this, q));
+  for (let v = 0, r; v < f.length; v++) {
+    r = d[v];
+    g && r.length && !r[0].doc && r.length && (r = xa.call(this, r));
     if (t) {
-      return q;
+      return r;
     }
-    d[v] = {field:f[v], result:q};
+    d[v] = {field:f[v], result:r};
   }
   return h ? ya(d, c) : d;
 };
@@ -1032,12 +1082,12 @@ function xa(a) {
   }
   const c = a.document || a.doc || a;
   var b;
-  this.F = [];
+  this.C = [];
   this.field = [];
-  this.K = [];
-  this.key = (b = c.key || c.id) && Y(b, this.K) || "id";
-  this.h = (this.fastupdate = !!a.fastupdate) ? new Map() : new Set();
-  this.B = (b = c.store || null) && !0 !== b && [];
+  this.I = [];
+  this.key = (b = c.key || c.id) && Y(b, this.I) || "id";
+  this.reg = (this.fastupdate = !!a.fastupdate) ? new Map() : new Set();
+  this.A = (b = c.store || null) && !0 !== b && [];
   this.store = b && new Map();
   this.cache = (b = a.cache || null) && new K(b);
   this.async = a.cache = !1;
@@ -1045,13 +1095,13 @@ function xa(a) {
   let e = c.index || c.field || c;
   z(e) && (e = [e]);
   for (let d = 0, f, g; d < e.length; d++) {
-    f = e[d], z(f) || (g = f, f = f.field), g = E(g) ? Object.assign({}, a, g) : a, b.set(f, new N(g, this.h)), g.custom ? this.F[d] = g.custom : (this.F[d] = Y(f, this.K), g.filter && ("string" === typeof this.F[d] && (this.F[d] = new String(this.F[d])), this.F[d].I = g.filter)), this.field[d] = f;
+    f = e[d], z(f) || (g = f, f = f.field), g = E(g) ? Object.assign({}, a, g) : a, b.set(f, new N(g, this.reg)), g.custom ? this.C[d] = g.custom : (this.C[d] = Y(f, this.I), g.filter && ("string" === typeof this.C[d] && (this.C[d] = new String(this.C[d])), this.C[d].G = g.filter)), this.field[d] = f;
   }
-  if (this.B) {
+  if (this.A) {
     a = c.store;
     z(a) && (a = [a]);
     for (let d = 0, f, g; d < a.length; d++) {
-      f = a[d], g = f.field || f, f.custom ? (this.B[d] = f.custom, f.custom.U = g) : (this.B[d] = Y(g, this.K), f.filter && ("string" === typeof this.B[d] && (this.B[d] = new String(this.B[d])), this.B[d].I = f.filter));
+      f = a[d], g = f.field || f, f.custom ? (this.A[d] = f.custom, f.custom.S = g) : (this.A[d] = Y(g, this.I), f.filter && ("string" === typeof this.A[d] && (this.A[d] = new String(this.A[d])), this.A[d].G = f.filter));
     }
   }
   this.index = b;
@@ -1059,16 +1109,16 @@ function xa(a) {
   if (b = c.tag) {
     if ("string" === typeof b && (b = [b]), b.length) {
       this.tag = new Map();
-      this.C = [];
-      this.T = [];
+      this.B = [];
+      this.R = [];
       for (let d = 0, f, g; d < b.length; d++) {
         f = b[d];
         g = f.field || f;
         if (!g) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
-        f.custom ? this.C[d] = f.custom : (this.C[d] = Y(g, this.K), f.filter && ("string" === typeof this.C[d] && (this.C[d] = new String(this.C[d])), this.C[d].I = f.filter));
-        this.T[d] = g;
+        f.custom ? this.B[d] = f.custom : (this.B[d] = Y(g, this.I), f.filter && ("string" === typeof this.B[d] && (this.B[d] = new String(this.B[d])), this.B[d].G = f.filter));
+        this.R[d] = g;
         this.tag.set(g, new Map());
       }
     }
@@ -1095,7 +1145,7 @@ u.remove = function(a) {
   for (var c of this.index.values()) {
     c.remove(a, !0);
   }
-  if (this.h.has(a)) {
+  if (this.reg.has(a)) {
     if (this.tag && !this.fastupdate) {
       for (let b of this.tag.values()) {
         for (let e of b) {
@@ -1106,7 +1156,7 @@ u.remove = function(a) {
       }
     }
     this.store && this.store.delete(a);
-    this.h.delete(a);
+    this.reg.delete(a);
   }
   this.cache && this.cache.remove(a);
   return this;
@@ -1124,7 +1174,7 @@ u.clear = function() {
   return this;
 };
 u.contain = function(a) {
-  return this.h.has(a);
+  return this.reg.has(a);
 };
 u.cleanup = function() {
   for (const a of this.index.values()) {
@@ -1156,7 +1206,7 @@ u.export = function(a, c, b, e, d, f) {
     switch(d) {
       case 1:
         c = "tag";
-        h = this.G;
+        h = this.D;
         b = null;
         break;
       case 2:
@@ -1176,13 +1226,13 @@ u.import = function(a, c) {
   if (c) {
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-        this.G = c;
+        this.D = c;
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+        this.reg = c;
         for (let e = 0, d; e < this.field.length; e++) {
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diff --git a/dist/flexsearch.compact.min.js b/dist/flexsearch.compact.min.js
index 498cc83..4977752 100644
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+function W(a,c,b,e,d,f,g,h){if(a=a[g])if(e===c.length-1){if(a.constructor===Array){if(b[e]){for(c=0;c<a.length;c++)d.add(f,a[c],!0,!0);return}a=a.join(" ")}d.add(f,a,h,!0)}else if(a.constructor===Array)for(g=0;g<a.length;g++)W(a,c,b,e,d,f,g,h);else g=c[++e],W(a,c,b,e,d,f,g,h)};V.prototype.search=function(a,c,b,e){b||(!c&&E(a)?(b=a,a=""):E(c)&&(b=c,c=0));let d=[];var f=[];let g,h,k,l,m;let q=0;if(b){b.constructor===Array&&(b={index:b});a=b.query||a;var t=b.pluck;h=b.merge;l=t||b.field||b.index;m=this.tag&&b.tag;g=this.store&&b.enrich;k=b.suggest;c=b.limit||c;var p=b.offset||0;c||(c=100);if(m){m.constructor!==Array&&(m=[m]);var n=[];for(let v=0,r;v<m.length;v++)if(r=m[v],r.field&&r.tag){var w=r.tag;if(w.constructor===Array)for(var B=0;B<w.length;B++)n.push(r.field,w[B]);
+else n.push(r.field,w)}else{w=Object.keys(r);for(let C=0,D,A;C<w.length;C++)if(D=w[C],A=r[D],A.constructor===Array)for(B=0;B<A.length;B++)n.push(D,A[B]);else n.push(D,A)}m=n;if(!a){e=[];if(n.length)for(f=0;f<n.length;f+=2)t=wa.call(this,n[f],n[f+1],c,p,g),d.push({field:n[f],tag:n[f+1],result:t});return e.length?Promise.all(e).then(function(v){for(let r=0;r<v.length;r++)d[r].result=v[r];return d}):d}}z(l)&&(l=[l])}l||(l=this.field);p=!e&&(this.worker||this.async)&&[];for(let v=0,r,C,D;v<l.length;v++){C=
+l[v];let A;z(C)||(A=C,C=A.field,a=A.query||a,c=A.limit||c,k=A.suggest||k);if(e)r=e[v];else if(n=A||b,w=this.index.get(C),m&&(n.enrich=!1),p){p[v]=w.searchAsync(a,c,n);n&&g&&(n.enrich=g);continue}else r=w.search(a,c,n),n&&g&&(n.enrich=g);D=r&&r.length;if(m&&D){n=[];w=0;for(let P=0,G,Aa;P<m.length;P+=2){G=this.tag.get(m[P]);if(!G)if(k)continue;else return d;if(Aa=(G=G&&G.get(m[P+1]))&&G.length)w++,n.push(G);else if(!k)return d}if(w){r=ua(r,n);D=r.length;if(!D&&!k)return d;w--}}if(D)f[q]=C,d.push(r),
+q++;else if(1===l.length)return d}if(p){const v=this;return Promise.all(p).then(function(r){return r.length?v.search(a,c,b,r):r})}if(!q)return d;if(t&&(!g||!this.store))return d[0];p=[];for(let v=0,r;v<f.length;v++){r=d[v];g&&r.length&&!r[0].doc&&r.length&&(r=xa.call(this,r));if(t)return r;d[v]={field:f[v],result:r}}return h?ya(d,c):d};
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+function xa(a){const c=Array(a.length);for(let b=0,e;b<a.length;b++)e=a[b],c[b]={id:e,doc:this.store.get(e)};return c};function V(a){if(!this)return new V(a);const c=a.document||a.doc||a;var b;this.C=[];this.field=[];this.I=[];this.key=(b=c.key||c.id)&&Y(b,this.I)||"id";this.reg=(this.fastupdate=!!a.fastupdate)?new Map:new Set;this.A=(b=c.store||null)&&!0!==b&&[];this.store=b&&new Map;this.cache=(b=a.cache||null)&&new J(b);this.async=a.cache=!1;b=new Map;let e=c.index||c.field||c;z(e)&&(e=[e]);for(let d=0,f,g;d<e.length;d++)f=e[d],z(f)||(g=f,f=f.field),g=E(g)?Object.assign({},a,g):a,b.set(f,new M(g,this.reg)),g.custom?
+this.C[d]=g.custom:(this.C[d]=Y(f,this.I),g.filter&&("string"===typeof this.C[d]&&(this.C[d]=new String(this.C[d])),this.C[d].G=g.filter)),this.field[d]=f;if(this.A){a=c.store;z(a)&&(a=[a]);for(let d=0,f,g;d<a.length;d++)f=a[d],g=f.field||f,f.custom?(this.A[d]=f.custom,f.custom.S=g):(this.A[d]=Y(g,this.I),f.filter&&("string"===typeof this.A[d]&&(this.A[d]=new String(this.A[d])),this.A[d].G=f.filter))}this.index=b;this.tag=null;if(b=c.tag)if("string"===typeof b&&(b=[b]),b.length){this.tag=new Map;
+this.B=[];this.R=[];for(let d=0,f,g;d<b.length;d++){f=b[d];g=f.field||f;if(!g)throw Error("The tag field from the document descriptor is undefined.");f.custom?this.B[d]=f.custom:(this.B[d]=Y(g,this.I),f.filter&&("string"===typeof this.B[d]&&(this.B[d]=new String(this.B[d])),this.B[d].G=f.filter));this.R[d]=g;this.tag.set(g,new Map)}}}
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-u.remove=function(a){E(a)&&(a=F(a,this.key));for(var c of this.index.values())c.remove(a,!0);if(this.h.has(a)){if(this.tag&&!this.fastupdate)for(let b of this.tag.values())for(let e of b){c=e[0];const d=e[1],f=d.indexOf(a);-1<f&&(1<d.length?d.splice(f,1):b.delete(c))}this.store&&this.store.delete(a);this.h.delete(a)}this.cache&&this.cache.remove(a);return this};
-u.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};u.contain=function(a){return this.h.has(a)};u.cleanup=function(){for(const a of this.index.values())a.cleanup();return this};u.get=function(a){return this.store.get(a)};u.set=function(a,c){this.store.set(a,c);return this};u.searchCache=ia;
-u.export=function(a,c,b,e,d,f){let g;"undefined"===typeof f&&(g=new Promise(k=>{f=k}));d||(d=0);e||(e=0);if(e<this.field.length){b=this.field[e];var h=this.index[b];c=this;h.export(a,c,d?b:"",e,d++,f)||(e++,c.export(a,c,b,e,1,f))}else{switch(d){case 1:c="tag";h=this.G;b=null;break;case 2:c="store";h=this.store;b=null;break;default:f();return}ra(a,this,b,c,e,d,h,f)}return g};
-u.import=function(a,c){if(c)switch(z(c)&&(c=JSON.parse(c)),a){case "tag":this.G=c;break;case "reg":this.fastupdate=!1;this.h=c;for(let e=0,d;e<this.field.length;e++)d=this.index[this.field[e]],d.h=c,d.fastupdate=!1;break;case "store":this.store=c;break;default:a=a.split(".");const b=a[0];a=a[1];b&&a&&this.index[b].import(a,c)}};ta(V.prototype);const za={Index:M,Charset:qa,Encoder:I,Document:V,Worker:null,Resolver:null,IndexedDB:null,Language:{}},Z=self;let Ba;(Ba=Z.define)&&Ba.amd?Ba([],function(){return za}):"object"===typeof Z.exports?Z.exports=za:Z.FlexSearch=za;}(this));
+u.remove=function(a){E(a)&&(a=F(a,this.key));for(var c of this.index.values())c.remove(a,!0);if(this.reg.has(a)){if(this.tag&&!this.fastupdate)for(let b of this.tag.values())for(let e of b){c=e[0];const d=e[1],f=d.indexOf(a);-1<f&&(1<d.length?d.splice(f,1):b.delete(c))}this.store&&this.store.delete(a);this.reg.delete(a)}this.cache&&this.cache.remove(a);return this};
+u.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};u.contain=function(a){return this.reg.has(a)};u.cleanup=function(){for(const a of this.index.values())a.cleanup();return this};u.get=function(a){return this.store.get(a)};u.set=function(a,c){this.store.set(a,c);return this};u.searchCache=ia;
+u.export=function(a,c,b,e,d,f){let g;"undefined"===typeof f&&(g=new Promise(k=>{f=k}));d||(d=0);e||(e=0);if(e<this.field.length){b=this.field[e];var h=this.index[b];c=this;h.export(a,c,d?b:"",e,d++,f)||(e++,c.export(a,c,b,e,1,f))}else{switch(d){case 1:c="tag";h=this.D;b=null;break;case 2:c="store";h=this.store;b=null;break;default:f();return}ra(a,this,b,c,e,d,h,f)}return g};
+u.import=function(a,c){if(c)switch(z(c)&&(c=JSON.parse(c)),a){case "tag":this.D=c;break;case "reg":this.fastupdate=!1;this.reg=c;for(let e=0,d;e<this.field.length;e++)d=this.index[this.field[e]],d.reg=c,d.fastupdate=!1;break;case "store":this.store=c;break;default:a=a.split(".");const b=a[0];a=a[1];b&&a&&this.index[b].import(a,c)}};ta(V.prototype);const za={Index:M,Charset:qa,Encoder:I,Document:V,Worker:null,Resolver:null,IndexedDB:null,Language:{}},Z=self;let Ba;(Ba=Z.define)&&Ba.amd?Ba([],function(){return za}):"object"===typeof Z.exports?Z.exports=za:Z.FlexSearch=za;}(this));
diff --git a/dist/flexsearch.compact.module.debug.js b/dist/flexsearch.compact.module.debug.js
index f424b0e..0bf165a 100644
--- a/dist/flexsearch.compact.module.debug.js
+++ b/dist/flexsearch.compact.module.debug.js
@@ -5,13 +5,13 @@
  * Hosted by Nextapps GmbH
  * https://github.com/nextapps-de/flexsearch
  */
-var v;
+var u;
 function x(a, c, b) {
-  const e = typeof b, f = typeof a;
-  if ("undefined" !== e) {
+  const d = typeof b, f = typeof a;
+  if ("undefined" !== d) {
     if ("undefined" !== f) {
       if (b) {
-        if ("function" === f && e === f) {
+        if ("function" === f && d === f) {
           return function(h) {
             return a(b(h));
           };
@@ -22,16 +22,16 @@ function x(a, c, b) {
             return b.concat(a);
           }
           if (c === Map) {
-            var d = new Map(b);
+            var e = new Map(b);
             for (var g of a) {
-              d.set(g[0], g[1]);
+              e.set(g[0], g[1]);
             }
-            return d;
+            return e;
           }
           if (c === Set) {
             g = new Set(b);
-            for (d of a.values()) {
-              g.add(d);
+            for (e of a.values()) {
+              g.add(e);
             }
             return g;
           }
@@ -86,10 +86,10 @@ J.prototype.assign = function(a) {
   this.normalize = x(a.normalize, !0, this.normalize);
   let c = a.include, b = c || a.exclude || a.split;
   if ("object" === typeof b) {
-    let e = !c, f = "";
+    let d = !c, f = "";
     a.include || (f += "\\p{Z}");
     b.letter && (f += "\\p{L}");
-    b.number && (f += "\\p{N}", e = !!c);
+    b.number && (f += "\\p{N}", d = !!c);
     b.symbol && (f += "\\p{S}");
     b.punctuation && (f += "\\p{P}");
     b.control && (f += "\\p{C}");
@@ -97,7 +97,7 @@ J.prototype.assign = function(a) {
       f += "object" === typeof b ? b.join("") : b;
     }
     this.split = new RegExp("[" + (c ? "^" : "") + f + "]+", "u");
-    this.numeric = e;
+    this.numeric = d;
   } else {
     this.split = x(b, ca, this.split), this.numeric = x(this.numeric, !0);
   }
@@ -113,18 +113,18 @@ J.prototype.assign = function(a) {
   this.replacer = x(a.replacer, null, this.replacer);
   this.minlength = x(a.minlength, 1, this.minlength);
   this.maxlength = x(a.maxlength, 0, this.maxlength);
-  this.F = "";
-  this.H = null;
-  this.D = "";
-  this.I = null;
+  this.C = "";
+  this.F = null;
+  this.B = "";
+  this.G = null;
   if (this.matcher) {
-    for (const e of this.matcher.keys()) {
-      this.F += (this.F ? "|" : "") + e;
+    for (const d of this.matcher.keys()) {
+      this.C += (this.C ? "|" : "") + d;
     }
   }
   if (this.stemmer) {
-    for (const e of this.stemmer.keys()) {
-      this.D += (this.D ? "|" : "") + e;
+    for (const d of this.stemmer.keys()) {
+      this.B += (this.B ? "|" : "") + d;
     }
   }
   return this;
@@ -136,37 +136,37 @@ J.prototype.encode = function(a) {
   const c = !(this.dedupe || this.mapper || this.filter || this.matcher || this.stemmer || this.replacer);
   let b = [];
   a = this.split || "" === this.split ? a.split(this.split) : a;
-  for (let f = 0, d; f < a.length; f++) {
-    if (!(d = a[f])) {
+  for (let f = 0, e; f < a.length; f++) {
+    if (!(e = a[f])) {
       continue;
     }
-    if (d.length < this.minlength) {
+    if (e.length < this.minlength) {
       continue;
     }
     if (c) {
-      b.push(d);
+      b.push(e);
       continue;
     }
-    if (this.filter && this.filter.has(d)) {
+    if (this.filter && this.filter.has(e)) {
       continue;
     }
     let g;
-    this.stemmer && 2 < d.length && (this.I || (this.I = new RegExp("(?!^)(" + this.D + ")$")), d = d.replace(this.I, h => this.stemmer.get(h)), g = 1);
-    this.matcher && 1 < d.length && (this.H || (this.H = new RegExp("(" + this.F + ")", "g")), d = d.replace(this.H, h => this.matcher.get(h)), g = 1);
-    d && g && (d.length < this.minlength || this.filter && this.filter.has(d)) && (d = "");
-    if (d && (this.mapper || this.dedupe && 1 < d.length)) {
-      var e = "";
-      for (let h = 0, k = "", n, l; h < d.length; h++) {
-        n = d.charAt(h), n === k && this.dedupe || ((l = this.mapper && this.mapper.get(n)) || "" === l ? l === k && this.dedupe || !(k = l) || (e += l) : e += k = n);
+    this.stemmer && 2 < e.length && (this.G || (this.G = new RegExp("(?!^)(" + this.B + ")$")), e = e.replace(this.G, h => this.stemmer.get(h)), g = 1);
+    this.matcher && 1 < e.length && (this.F || (this.F = new RegExp("(" + this.C + ")", "g")), e = e.replace(this.F, h => this.matcher.get(h)), g = 1);
+    e && g && (e.length < this.minlength || this.filter && this.filter.has(e)) && (e = "");
+    if (e && (this.mapper || this.dedupe && 1 < e.length)) {
+      var d = "";
+      for (let h = 0, k = "", m, l; h < e.length; h++) {
+        m = e.charAt(h), m === k && this.dedupe || ((l = this.mapper && this.mapper.get(m)) || "" === l ? l === k && this.dedupe || !(k = l) || (d += l) : d += k = m);
       }
-      d = e;
+      e = d;
     }
-    if (d && this.replacer) {
-      for (e = 0; d && e < this.replacer.length; e += 2) {
-        d = d.replace(this.replacer[e], this.replacer[e + 1]);
+    if (e && this.replacer) {
+      for (d = 0; e && d < this.replacer.length; d += 2) {
+        e = e.replace(this.replacer[d], this.replacer[d + 1]);
       }
     }
-    d && b.push(d);
+    e && b.push(e);
   }
   this.finalize && (b = this.finalize(b) || b);
   return b;
@@ -183,10 +183,10 @@ const la = /[\x00-\x7F]+/g;
 var ma = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:K, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:L}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:L, replacer:ha, matcher:M}, LatinExtra:{normalize:!0, dedupe:!0, mapper:L, replacer:ha.concat([/(?!^)[aeoy]/g, ""]), matcher:M}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
   for (let b = 0; b < a.length; b++) {
     var c = a[b];
-    let e = c.charAt(0), f = ia[e];
-    for (let d = 1, g; d < c.length && (g = c.charAt(d), "h" === g || "w" === g || !(g = ia[g]) || g === f || (e += g, f = g, 4 !== e.length)); d++) {
+    let d = c.charAt(0), f = ia[d];
+    for (let e = 1, g; e < c.length && (g = c.charAt(e), "h" === g || "w" === g || !(g = ia[g]) || g === f || (d += g, f = g, 4 !== d.length)); e++) {
     }
-    a[b] = e;
+    a[b] = d;
   }
 }}, ArabicDefault:{rtl:!0, normalize:!1, dedupe:!0, prepare:function(a) {
   return ("" + a).replace(ja, " ");
@@ -195,10 +195,10 @@ var ma = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:K, LatinSimple:{nor
 }}, CyrillicDefault:{normalize:!1, dedupe:!0, prepare:function(a) {
   return ("" + a).replace(la, " ");
 }}};
-function na(a, c, b, e, f, d, g, h) {
-  (e = a(b ? b + "." + e : e, JSON.stringify(g))) && e.then ? e.then(function() {
-    c.export(a, c, b, f, d + 1, h);
-  }) : c.export(a, c, b, f, d + 1, h);
+function na(a, c, b, d, f, e, g, h) {
+  (d = a(b ? b + "." + d : d, JSON.stringify(g))) && d.then ? d.then(function() {
+    c.export(a, c, b, f, e + 1, h);
+  }) : c.export(a, c, b, f, e + 1, h);
 }
 ;const oa = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
 function pa(a) {
@@ -212,36 +212,36 @@ function N(a) {
   this[a + "Async"] = function() {
     var c = arguments;
     const b = c[c.length - 1];
-    let e;
-    "function" === typeof b && (e = b, delete c[c.length - 1]);
+    let d;
+    "function" === typeof b && (d = b, delete c[c.length - 1]);
     this.async = !0;
     c = this[a].apply(this, c);
     this.async = !1;
-    e && (c.then ? c.then(e) : e(c));
+    d && (c.then ? c.then(d) : d(c));
     return c;
   };
 }
 ;y();
-O.prototype.add = function(a, c, b, e) {
+O.prototype.add = function(a, c, b, d) {
   if (c && (a || 0 === a)) {
-    if (!e && !b && this.h.has(a)) {
+    if (!d && !b && this.reg.has(a)) {
       return this.update(a, c);
     }
     c = this.encoder.encode(c);
-    if (e = c.length) {
-      const n = y(), l = y(), r = this.depth, t = this.resolution;
-      for (let p = 0; p < e; p++) {
-        let m = c[this.rtl ? e - 1 - p : p];
-        var f = m.length;
-        if (f && (r || !l[m])) {
-          var d = this.score ? this.score(c, m, p, null, 0) : P(t, e, p), g = "";
+    if (d = c.length) {
+      const m = y(), l = y(), r = this.depth, t = this.resolution;
+      for (let p = 0; p < d; p++) {
+        let n = c[this.rtl ? d - 1 - p : p];
+        var f = n.length;
+        if (f && (r || !l[n])) {
+          var e = this.score ? this.score(c, n, p, null, 0) : P(t, d, p), g = "";
           switch(this.tokenize) {
             case "full":
               if (2 < f) {
-                for (d = 0; d < f; d++) {
-                  for (var h = f; h > d; h--) {
-                    g = m.substring(d, h);
-                    var k = this.score ? this.score(c, m, p, g, d) : P(t, e, p, f, d);
+                for (e = 0; e < f; e++) {
+                  for (var h = f; h > e; h--) {
+                    g = n.substring(e, h);
+                    var k = this.score ? this.score(c, n, p, g, e) : P(t, d, p, f, e);
                     Q(this, l, g, k, a, b);
                   }
                 }
@@ -250,63 +250,63 @@ O.prototype.add = function(a, c, b, e) {
             case "reverse":
               if (1 < f) {
                 for (h = f - 1; 0 < h; h--) {
-                  g = m[h] + g, k = this.score ? this.score(c, m, p, g, h) : P(t, e, p, f, h), Q(this, l, g, k, a, b);
+                  g = n[h] + g, k = this.score ? this.score(c, n, p, g, h) : P(t, d, p, f, h), Q(this, l, g, k, a, b);
                 }
                 g = "";
               }
             case "forward":
               if (1 < f) {
                 for (h = 0; h < f; h++) {
-                  g += m[h], Q(this, l, g, d, a, b);
+                  g += n[h], Q(this, l, g, e, a, b);
                 }
                 break;
               }
             default:
-              if (Q(this, l, m, d, a, b), r && 1 < e && p < e - 1) {
-                for (f = y(), g = this.K, d = m, h = Math.min(r + 1, e - p), f[d] = 1, k = 1; k < h; k++) {
-                  if ((m = c[this.rtl ? e - 1 - p - k : p + k]) && !f[m]) {
-                    f[m] = 1;
-                    const w = this.score ? this.score(c, d, p, m, k) : P(g + (e / 2 > g ? 0 : 1), e, p, h - 1, k - 1), B = this.bidirectional && m > d;
-                    Q(this, n, B ? d : m, w, a, b, B ? m : d);
+              if (Q(this, l, n, e, a, b), r && 1 < d && p < d - 1) {
+                for (f = y(), g = this.I, e = n, h = Math.min(r + 1, d - p), f[e] = 1, k = 1; k < h; k++) {
+                  if ((n = c[this.rtl ? d - 1 - p - k : p + k]) && !f[n]) {
+                    f[n] = 1;
+                    const w = this.score ? this.score(c, e, p, n, k) : P(g + (d / 2 > g ? 0 : 1), d, p, h - 1, k - 1), B = this.bidirectional && n > e;
+                    Q(this, m, B ? e : n, w, a, b, B ? n : e);
                   }
                 }
               }
           }
         }
       }
-      this.fastupdate || this.h.add(a);
+      this.fastupdate || this.reg.add(a);
     }
   }
   return this;
 };
-function Q(a, c, b, e, f, d, g) {
-  let h = g ? a.B : a.map, k;
-  c[b] && g && (k = c[b])[g] || (g ? (c = k || (c[b] = y()), c[g] = 1, (k = h.get(g)) ? h = k : h.set(g, h = new Map())) : c[b] = 1, (k = h.get(b)) ? h = k : h.set(b, h = []), h = h[e] || (h[e] = []), d && h.includes(f) || (h.push(f), a.fastupdate && ((c = a.h.get(f)) ? c.push(h) : a.h.set(f, [h]))));
+function Q(a, c, b, d, f, e, g) {
+  let h = g ? a.ctx : a.map, k;
+  c[b] && g && (k = c[b])[g] || (g ? (c = k || (c[b] = y()), c[g] = 1, (k = h.get(g)) ? h = k : h.set(g, h = new Map())) : c[b] = 1, (k = h.get(b)) ? h = k : h.set(b, h = []), h = h[d] || (h[d] = []), e && h.includes(f) || (h.push(f), a.fastupdate && ((c = a.reg.get(f)) ? c.push(h) : a.reg.set(f, [h]))));
 }
-function P(a, c, b, e, f) {
-  return b && 1 < a ? c + (e || 0) <= a ? b + (f || 0) : (a - 1) / (c + (e || 0)) * (b + (f || 0)) + 1 | 0 : 0;
+function P(a, c, b, d, f) {
+  return b && 1 < a ? c + (d || 0) <= a ? b + (f || 0) : (a - 1) / (c + (d || 0)) * (b + (f || 0)) + 1 | 0 : 0;
 }
 ;function R(a, c, b) {
   if (1 === a.length) {
     return a = a[0], a = b || a.length > c ? c ? a.slice(b, b + c) : a.slice(b) : a;
   }
-  let e = [];
-  for (let f = 0, d, g; f < a.length; f++) {
-    if ((d = a[f]) && (g = d.length)) {
+  let d = [];
+  for (let f = 0, e, g; f < a.length; f++) {
+    if ((e = a[f]) && (g = e.length)) {
       if (b) {
         if (b >= g) {
           b -= g;
           continue;
         }
-        b < g && (d = c ? d.slice(b, b + c) : d.slice(b), g = d.length, b = 0);
+        b < g && (e = c ? e.slice(b, b + c) : e.slice(b), g = e.length, b = 0);
       }
-      if (e.length) {
-        g > c && (d = d.slice(0, c), g = d.length), e.push(d);
+      if (d.length) {
+        g > c && (e = e.slice(0, c), g = e.length), d.push(e);
       } else {
         if (g >= c) {
-          return g > c && (d = d.slice(0, c)), d;
+          return g > c && (e = e.slice(0, c)), e;
         }
-        e = [d];
+        d = [e];
       }
       c -= g;
       if (!c) {
@@ -314,29 +314,29 @@ function P(a, c, b, e, f) {
       }
     }
   }
-  return e.length ? e = 1 < e.length ? [].concat.apply([], e) : e[0] : e;
+  return d.length ? d = 1 < d.length ? [].concat.apply([], d) : d[0] : d;
 }
 ;function qa(a, c) {
-  const b = y(), e = y(), f = [];
-  for (let d = 0; d < a.length; d++) {
-    b[a[d]] = 1;
+  const b = y(), d = y(), f = [];
+  for (let e = 0; e < a.length; e++) {
+    b[a[e]] = 1;
   }
-  for (let d = 0, g; d < c.length; d++) {
-    g = c[d];
+  for (let e = 0, g; e < c.length; e++) {
+    g = c[e];
     for (let h = 0, k; h < g.length; h++) {
-      k = g[h], b[k] && !e[k] && (e[k] = 1, f.push(k));
+      k = g[h], b[k] && !d[k] && (d[k] = 1, f.push(k));
     }
   }
   return f;
 }
 ;O.prototype.search = function(a, c, b) {
   b || (!c && E(a) ? (b = a, a = "") : E(c) && (b = c, c = 0));
-  var e = [], f = 0;
+  var d = [], f = 0;
   if (b) {
     a = b.query || a;
     c = b.limit || c;
     f = b.offset || 0;
-    var d = b.context;
+    var e = b.context;
     var g = b.suggest;
   }
   a = this.encoder.encode(a);
@@ -345,79 +345,79 @@ function P(a, c, b, e, f) {
   if (1 === b) {
     return S.call(this, a[0], "", c, f);
   }
-  d = this.depth && !1 !== d;
-  if (2 === b && d && !g) {
+  e = this.depth && !1 !== e;
+  if (2 === b && e && !g) {
     return S.call(this, a[0], a[1], c, f);
   }
   var h = 0, k = 0;
   if (1 < b) {
-    var n = y();
+    var m = y();
     const r = [];
     for (let t = 0, p; t < b; t++) {
-      if ((p = a[t]) && !n[p]) {
+      if ((p = a[t]) && !m[p]) {
         if (g || T(this, p)) {
-          r.push(p), n[p] = 1;
+          r.push(p), m[p] = 1;
         } else {
-          return e;
+          return d;
         }
-        const m = p.length;
-        h = Math.max(h, m);
-        k = k ? Math.min(k, m) : m;
+        const n = p.length;
+        h = Math.max(h, n);
+        k = k ? Math.min(k, n) : n;
       }
     }
     a = r;
     b = a.length;
   }
   if (!b) {
-    return e;
+    return d;
   }
-  n = 0;
+  m = 0;
   if (1 === b) {
     return S.call(this, a[0], "", c, f);
   }
-  if (2 === b && d && !g) {
+  if (2 === b && e && !g) {
     return S.call(this, a[0], a[1], c, f);
   }
   if (1 < b) {
-    if (d) {
+    if (e) {
       var l = a[0];
-      n = 1;
+      m = 1;
     } else {
       9 < h && 3 < h / k && a.sort(aa);
     }
   }
-  for (let r, t; n < b; n++) {
-    t = a[n];
-    l ? (r = T(this, t, l), r = ra(r, e, g, this.K, c, f, 2 === b), g && !1 === r && e.length || (l = t)) : (r = T(this, t), r = ra(r, e, g, this.resolution, c, f, 1 === b));
+  for (let r, t; m < b; m++) {
+    t = a[m];
+    l ? (r = T(this, t, l), r = ra(r, d, g, this.I, c, f, 2 === b), g && !1 === r && d.length || (l = t)) : (r = T(this, t), r = ra(r, d, g, this.resolution, c, f, 1 === b));
     if (r) {
       return r;
     }
-    if (g && n === b - 1) {
-      d = e.length;
-      if (!d) {
+    if (g && m === b - 1) {
+      e = d.length;
+      if (!e) {
         if (l) {
           l = "";
-          n = -1;
+          m = -1;
           continue;
         }
-        return e;
+        return d;
       }
-      if (1 === d) {
-        return R(e[0], c, f);
+      if (1 === e) {
+        return R(d[0], c, f);
       }
     }
   }
   a: {
-    a = e;
-    e = this.resolution;
+    a = d;
+    d = this.resolution;
     l = a.length;
     b = [];
-    d = y();
-    for (let r = 0, t, p, m, w; r < e; r++) {
+    e = y();
+    for (let r = 0, t, p, n, w; r < d; r++) {
       for (k = 0; k < l; k++) {
-        if (m = a[k], r < m.length && (t = m[r])) {
-          for (n = 0; n < t.length; n++) {
-            p = t[n], (h = d[p]) ? d[p]++ : (h = 0, d[p] = 1), w = b[h] || (b[h] = []), w.push(p);
+        if (n = a[k], r < n.length && (t = n[r])) {
+          for (m = 0; m < t.length; m++) {
+            p = t[m], (h = e[p]) ? e[p]++ : (h = 0, e[p] = 1), w = b[h] || (b[h] = []), w.push(p);
           }
         }
       }
@@ -427,12 +427,12 @@ function P(a, c, b, e, f) {
         if (1 < b.length) {
           g = b;
           a = [];
-          e = y();
-          d = g.length;
-          for (k = 0; k < d; k++) {
-            for (l = g[k], h = l.length, n = 0; n < h; n++) {
-              if (b = l[n], !e[b]) {
-                if (e[b] = 1, f) {
+          d = y();
+          e = g.length;
+          for (k = 0; k < e; k++) {
+            for (l = g[k], h = l.length, m = 0; m < h; m++) {
+              if (b = l[m], !d[b]) {
+                if (d[b] = 1, f) {
                   f--;
                 } else {
                   if (a.push(b), a.length === c) {
@@ -449,7 +449,7 @@ function P(a, c, b, e, f) {
         b = c;
       } else {
         if (a < l) {
-          e = [];
+          d = [];
           break a;
         }
         b = b[a - 1];
@@ -458,20 +458,20 @@ function P(a, c, b, e, f) {
         }
       }
     }
-    e = b;
+    d = b;
   }
-  return e;
+  return d;
 };
-function S(a, c, b, e) {
-  return (a = T(this, a, c)) && a.length ? R(a, b, e) : [];
+function S(a, c, b, d) {
+  return (a = T(this, a, c)) && a.length ? R(a, b, d) : [];
 }
-function ra(a, c, b, e, f, d, g) {
+function ra(a, c, b, d, f, e, g) {
   let h = [];
   if (a) {
-    e = Math.min(a.length, e);
-    for (let k = 0, n = 0, l; k < e; k++) {
+    d = Math.min(a.length, d);
+    for (let k = 0, m = 0, l; k < d; k++) {
       if (l = a[k]) {
-        if (d && l && g && (l.length <= d ? (d -= l.length, l = null) : (l = l.slice(d), d = 0)), l && (h[k] = l, g && (n += l.length, n >= f))) {
+        if (e && l && g && (l.length <= e ? (e -= l.length, l = null) : (l = l.slice(e), e = 0)), l && (h[k] = l, g && (m += l.length, m >= f))) {
           break;
         }
       }
@@ -487,39 +487,39 @@ function ra(a, c, b, e, f, d, g) {
   return !b && h;
 }
 function T(a, c, b) {
-  let e;
-  b && (e = a.bidirectional && c > b);
-  a = b ? (a = a.B.get(e ? c : b)) && a.get(e ? b : c) : a.map.get(c);
+  let d;
+  b && (d = a.bidirectional && c > b);
+  a = b ? (a = a.ctx.get(d ? c : b)) && a.get(d ? b : c) : a.map.get(c);
   return a;
 }
 ;O.prototype.remove = function(a, c) {
-  const b = this.h.size && (this.fastupdate ? this.h.get(a) : this.h.has(a));
+  const b = this.reg.size && (this.fastupdate ? this.reg.get(a) : this.reg.has(a));
   if (b) {
     if (this.fastupdate) {
-      for (let e = 0, f; e < b.length; e++) {
-        if (f = b[e]) {
+      for (let d = 0, f; d < b.length; d++) {
+        if (f = b[d]) {
           if (2 > f.length) {
             f.pop();
           } else {
-            const d = f.indexOf(a);
-            d === b.length - 1 ? f.pop() : f.splice(d, 1);
+            const e = f.indexOf(a);
+            e === b.length - 1 ? f.pop() : f.splice(e, 1);
           }
         }
       }
     } else {
-      U(this.map, a), this.depth && U(this.B, a);
+      U(this.map, a), this.depth && U(this.ctx, a);
     }
-    c || this.h.delete(a);
+    c || this.reg.delete(a);
   }
   return this;
 };
 function U(a, c) {
   let b = 0;
   if (a.constructor === Array) {
-    for (let e = 0, f, d; e < a.length; e++) {
-      if ((f = a[e]) && f.length) {
-        if (d = f.indexOf(c), 0 <= d) {
-          1 < f.length ? (f.splice(d, 1), b++) : delete a[e];
+    for (let d = 0, f, e; d < a.length; d++) {
+      if ((f = a[d]) && f.length) {
+        if (e = f.indexOf(c), 0 <= e) {
+          1 < f.length ? (f.splice(e, 1), b++) : delete a[d];
           break;
         } else {
           b++;
@@ -527,9 +527,9 @@ function U(a, c) {
       }
     }
   } else {
-    for (let e of a) {
-      const f = e[0], d = U(e[1], c);
-      d ? b += d : a.delete(f);
+    for (let d of a) {
+      const f = d[0], e = U(d[1], c);
+      e ? b += e : a.delete(f);
     }
   }
   return b;
@@ -545,8 +545,8 @@ function U(a, c) {
     a = {};
   }
   b = a.context || {};
-  const e = a.encode || a.encoder || K;
-  this.encoder = e.encode ? e : "object" === typeof e ? new J(e) : {encode:e};
+  const d = a.encode || a.encoder || K;
+  this.encoder = d.encode ? d : "object" === typeof d ? new J(d) : {encode:d};
   let f;
   this.resolution = a.resolution || 9;
   this.tokenize = f = a.tokenize || "strict";
@@ -555,57 +555,57 @@ function U(a, c) {
   this.fastupdate = !!a.fastupdate;
   this.score = a.score || null;
   this.map = new Map();
-  this.B = new Map();
-  this.h = c || (this.fastupdate ? new Map() : new Set());
-  this.K = b.resolution || 1;
-  this.rtl = e.rtl || a.rtl || !1;
+  this.ctx = new Map();
+  this.reg = c || (this.fastupdate ? new Map() : new Set());
+  this.I = b.resolution || 1;
+  this.rtl = d.rtl || a.rtl || !1;
 }
-v = O.prototype;
-v.clear = function() {
+u = O.prototype;
+u.clear = function() {
   this.map.clear();
-  this.B.clear();
-  this.h.clear();
+  this.ctx.clear();
+  this.reg.clear();
   return this;
 };
-v.append = function(a, c) {
+u.append = function(a, c) {
   return this.add(a, c, !0);
 };
-v.contain = function(a) {
-  return this.h.has(a);
+u.contain = function(a) {
+  return this.reg.has(a);
 };
-v.update = function(a, c) {
+u.update = function(a, c) {
   if (this.async) {
-    const b = this, e = this.remove(a);
-    return e.then ? e.then(() => b.add(a, c)) : this.add(a, c);
+    const b = this, d = this.remove(a);
+    return d.then ? d.then(() => b.add(a, c)) : this.add(a, c);
   }
   return this.remove(a).add(a, c);
 };
 function V(a) {
   let c = 0;
   if (a.constructor === Array) {
-    for (let b = 0, e; b < a.length; b++) {
-      (e = a[b]) && (c += e.length);
+    for (let b = 0, d; b < a.length; b++) {
+      (d = a[b]) && (c += d.length);
     }
   } else {
     for (const b of a) {
-      const e = b[0], f = V(b[1]);
-      f ? c += f : a.delete(e);
+      const d = b[0], f = V(b[1]);
+      f ? c += f : a.delete(d);
     }
   }
   return c;
 }
-v.cleanup = function() {
+u.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
   V(this.map);
-  this.depth && V(this.B);
+  this.depth && V(this.ctx);
   return this;
 };
-v.export = function(a, c, b, e, f, d) {
+u.export = function(a, c, b, d, f, e) {
   let g = !0;
-  "undefined" === typeof d && (g = new Promise(n => {
-    d = n;
+  "undefined" === typeof e && (g = new Promise(m => {
+    e = m;
   }));
   let h, k;
   switch(f || (f = 0)) {
@@ -613,16 +613,16 @@ v.export = function(a, c, b, e, f, d) {
       h = "reg";
       if (this.fastupdate) {
         k = y();
-        for (let n of this.h.keys()) {
-          k[n] = 1;
+        for (let m of this.reg.keys()) {
+          k[m] = 1;
         }
       } else {
-        k = this.h;
+        k = this.reg;
       }
       break;
     case 1:
       h = "cfg";
-      k = {doc:0, opt:this.F ? 1 : 0};
+      k = {doc:0, opt:this.C ? 1 : 0};
       break;
     case 2:
       h = "map";
@@ -630,59 +630,109 @@ v.export = function(a, c, b, e, f, d) {
       break;
     case 3:
       h = "ctx";
-      k = this.B;
+      k = this.ctx;
       break;
     default:
-      "undefined" === typeof b && d && d();
+      "undefined" === typeof b && e && e();
       return;
   }
-  na(a, c || this, b, h, e, f, k, d);
+  na(a, c || this, b, h, d, f, k, e);
   return g;
 };
-v.import = function(a, c) {
+u.import = function(a, c) {
   if (c) {
     switch(z(c) && (c = JSON.parse(c)), a) {
       case "cfg":
-        this.F = !!c.opt;
+        this.C = !!c.opt;
         break;
       case "reg":
         this.fastupdate = !1;
-        this.h = c;
+        this.reg = c;
         break;
       case "map":
         this.map = c;
         break;
       case "ctx":
-        this.B = c;
+        this.ctx = c;
     }
   }
 };
+u.serialize = function(a = !0) {
+  if (!this.reg.size) {
+    return "";
+  }
+  let c = "", b = "";
+  for (var d of this.reg.keys()) {
+    b || (b = typeof d), c += (c ? "," : "") + ("string" === b ? '"' + d + '"' : d);
+  }
+  c = "index.reg=new Set([" + c + "]);";
+  d = "";
+  for (var f of this.map.entries()) {
+    var e = f[0], g = f[1], h = "";
+    for (let l = 0, r; l < g.length; l++) {
+      r = g[l] || [""];
+      var k = "";
+      for (var m = 0; m < r.length; m++) {
+        k += (k ? "," : "") + ("string" === b ? '"' + r[m] + '"' : r[m]);
+      }
+      k = "[" + k + "]";
+      h += (h ? "," : "") + k;
+    }
+    h = '["' + e + '",[' + h + "]]";
+    d += (d ? "," : "") + h;
+  }
+  d = "index.map=new Map([" + d + "]);";
+  f = "";
+  for (const l of this.ctx.entries()) {
+    e = l[0];
+    g = l[1];
+    for (const r of g.entries()) {
+      g = r[0];
+      h = r[1];
+      k = "";
+      for (let t = 0, p; t < h.length; t++) {
+        p = h[t] || [""];
+        m = "";
+        for (let n = 0; n < p.length; n++) {
+          m += (m ? "," : "") + ("string" === b ? '"' + p[n] + '"' : p[n]);
+        }
+        m = "[" + m + "]";
+        k += (k ? "," : "") + m;
+      }
+      k = 'new Map([["' + g + '",[' + k + "]]])";
+      k = '["' + e + '",' + k + "]";
+      f += (f ? "," : "") + k;
+    }
+  }
+  f = "index.ctx=new Map([" + f + "]);";
+  return a ? "function inject(index){" + c + d + f + "}" : c + d + f;
+};
 pa(O.prototype);
 W.prototype.add = function(a, c, b) {
   E(a) && (c = a, a = F(c, this.key));
   if (c && (a || 0 === a)) {
-    if (!b && this.h.has(a)) {
+    if (!b && this.reg.has(a)) {
       return this.update(a, c);
     }
-    for (let f = 0, d; f < this.field.length; f++) {
-      d = this.C[f];
+    for (let f = 0, e; f < this.field.length; f++) {
+      e = this.A[f];
       const g = this.index.get(this.field[f]);
-      if ("function" === typeof d) {
-        var e = d(c);
-        e && g.add(a, e, !1, !0);
+      if ("function" === typeof e) {
+        var d = e(c);
+        d && g.add(a, d, !1, !0);
       } else {
-        if (e = d.J, !e || e(c)) {
-          d.constructor === String ? d = ["" + d] : z(d) && (d = [d]), X(c, d, this.G, 0, g, a, d[0], b);
+        if (d = e.H, !d || d(c)) {
+          e.constructor === String ? e = ["" + e] : z(e) && (e = [e]), X(c, e, this.D, 0, g, a, e[0], b);
         }
       }
     }
     if (this.store && (!b || !this.store.has(a))) {
       let f;
-      if (this.A) {
+      if (this.h) {
         f = y();
-        for (let d = 0, g; d < this.A.length; d++) {
-          g = this.A[d];
-          if ((b = g.J) && !b(c)) {
+        for (let e = 0, g; e < this.h.length; e++) {
+          g = this.h[e];
+          if ((b = g.H) && !b(c)) {
             continue;
           }
           let h;
@@ -691,7 +741,7 @@ W.prototype.add = function(a, c, b) {
             if (!h) {
               continue;
             }
-            g = [g.L];
+            g = [g.J];
           } else if (z(g) || g.constructor === String) {
             f[g] = c[g];
             continue;
@@ -704,56 +754,56 @@ W.prototype.add = function(a, c, b) {
   }
   return this;
 };
-function Y(a, c, b, e, f, d) {
+function Y(a, c, b, d, f, e) {
   a = a[f];
-  if (e === b.length - 1) {
-    c[f] = d || a;
+  if (d === b.length - 1) {
+    c[f] = e || a;
   } else if (a) {
     if (a.constructor === Array) {
       for (c = c[f] = Array(a.length), f = 0; f < a.length; f++) {
-        Y(a, c, b, e, f);
+        Y(a, c, b, d, f);
       }
     } else {
-      c = c[f] || (c[f] = y()), f = b[++e], Y(a, c, b, e, f);
+      c = c[f] || (c[f] = y()), f = b[++d], Y(a, c, b, d, f);
     }
   }
 }
-function X(a, c, b, e, f, d, g, h) {
+function X(a, c, b, d, f, e, g, h) {
   if (a = a[g]) {
-    if (e === c.length - 1) {
+    if (d === c.length - 1) {
       if (a.constructor === Array) {
-        if (b[e]) {
+        if (b[d]) {
           for (c = 0; c < a.length; c++) {
-            f.add(d, a[c], !0, !0);
+            f.add(e, a[c], !0, !0);
           }
           return;
         }
         a = a.join(" ");
       }
-      f.add(d, a, h, !0);
+      f.add(e, a, h, !0);
     } else {
       if (a.constructor === Array) {
         for (g = 0; g < a.length; g++) {
-          X(a, c, b, e, f, d, g, h);
+          X(a, c, b, d, f, e, g, h);
         }
       } else {
-        g = c[++e], X(a, c, b, e, f, d, g, h);
+        g = c[++d], X(a, c, b, d, f, e, g, h);
       }
     }
   }
 }
-;W.prototype.search = function(a, c, b, e) {
+;W.prototype.search = function(a, c, b, d) {
   b || (!c && E(a) ? (b = a, a = "") : E(c) && (b = c, c = 0));
   let f = [];
-  var d = [];
-  let g, h, k, n, l;
+  var e = [];
+  let g, h, k, m, l;
   let r = 0;
   if (b) {
     b.constructor === Array && (b = {index:b});
     a = b.query || a;
     var t = b.pluck;
     h = b.merge;
-    n = t || b.field || b.index;
+    m = t || b.field || b.index;
     l = !1;
     g = this.store && b.enrich;
     k = b.suggest;
@@ -762,9 +812,9 @@ function X(a, c, b, e, f, d, g, h) {
     c || (c = 100);
     if (l) {
       l.constructor !== Array && (l = [l]);
-      var m = [];
-      for (let u = 0, q; u < l.length; u++) {
-        q = l[u];
+      var n = [];
+      for (let v = 0, q; v < l.length; v++) {
+        q = l[v];
         if (z(q)) {
           throw Error("A tag option can't be a string, instead it needs a { field: tag } format.");
         }
@@ -772,65 +822,65 @@ function X(a, c, b, e, f, d, g, h) {
           var w = q.tag;
           if (w.constructor === Array) {
             for (var B = 0; B < w.length; B++) {
-              m.push(q.field, w[B]);
+              n.push(q.field, w[B]);
             }
           } else {
-            m.push(q.field, w);
+            n.push(q.field, w);
           }
         } else {
           w = Object.keys(q);
           for (let C = 0, D, A; C < w.length; C++) {
             if (D = w[C], A = q[D], A.constructor === Array) {
               for (B = 0; B < A.length; B++) {
-                m.push(D, A[B]);
+                n.push(D, A[B]);
               }
             } else {
-              m.push(D, A);
+              n.push(D, A);
             }
           }
         }
       }
-      if (!m.length) {
+      if (!n.length) {
         throw Error("Your tag definition within the search options is probably wrong. No valid tags found.");
       }
-      l = m;
+      l = n;
       if (!a) {
-        e = [];
-        if (m.length) {
-          for (d = 0; d < m.length; d += 2) {
-            t = sa.call(this, m[d], m[d + 1], c, p, g), f.push({field:m[d], tag:m[d + 1], result:t});
+        d = [];
+        if (n.length) {
+          for (e = 0; e < n.length; e += 2) {
+            t = sa.call(this, n[e], n[e + 1], c, p, g), f.push({field:n[e], tag:n[e + 1], result:t});
           }
         }
-        return e.length ? Promise.all(e).then(function(u) {
-          for (let q = 0; q < u.length; q++) {
-            f[q].result = u[q];
+        return d.length ? Promise.all(d).then(function(v) {
+          for (let q = 0; q < v.length; q++) {
+            f[q].result = v[q];
           }
           return f;
         }) : f;
       }
     }
-    z(n) && (n = [n]);
+    z(m) && (m = [m]);
   }
-  n || (n = this.field);
-  p = !e && (this.worker || this.async) && [];
-  for (let u = 0, q, C, D; u < n.length; u++) {
-    C = n[u];
+  m || (m = this.field);
+  p = !d && (this.worker || this.async) && [];
+  for (let v = 0, q, C, D; v < m.length; v++) {
+    C = m[v];
     let A;
     z(C) || (A = C, C = A.field, a = A.query || a, c = A.limit || c, k = A.suggest || k);
-    if (e) {
-      q = e[u];
+    if (d) {
+      q = d[v];
     } else {
-      if (m = A || b, w = this.index.get(C), l && (m.enrich = !1), p) {
-        p[u] = w.searchAsync(a, c, m);
-        m && g && (m.enrich = g);
+      if (n = A || b, w = this.index.get(C), l && (n.enrich = !1), p) {
+        p[v] = w.searchAsync(a, c, n);
+        n && g && (n.enrich = g);
         continue;
       } else {
-        q = w.search(a, c, m), m && g && (m.enrich = g);
+        q = w.search(a, c, n), n && g && (n.enrich = g);
       }
     }
     D = q && q.length;
     if (l && D) {
-      m = [];
+      n = [];
       w = 0;
       for (let G = 0, H, ua; G < l.length; G += 2) {
         H = this.tag.get(l[G]);
@@ -842,13 +892,13 @@ function X(a, c, b, e, f, d, g, h) {
           }
         }
         if (ua = (H = H && H.get(l[G + 1])) && H.length) {
-          w++, m.push(H);
+          w++, n.push(H);
         } else if (!k) {
           return f;
         }
       }
       if (w) {
-        q = qa(q, m);
+        q = qa(q, n);
         D = q.length;
         if (!D && !k) {
           return f;
@@ -857,15 +907,15 @@ function X(a, c, b, e, f, d, g, h) {
       }
     }
     if (D) {
-      d[r] = C, f.push(q), r++;
-    } else if (1 === n.length) {
+      e[r] = C, f.push(q), r++;
+    } else if (1 === m.length) {
       return f;
     }
   }
   if (p) {
-    const u = this;
+    const v = this;
     return Promise.all(p).then(function(q) {
-      return q.length ? u.search(a, c, b, q) : q;
+      return q.length ? v.search(a, c, b, q) : q;
     });
   }
   if (!r) {
@@ -875,52 +925,52 @@ function X(a, c, b, e, f, d, g, h) {
     return f[0];
   }
   p = [];
-  for (let u = 0, q; u < d.length; u++) {
-    q = f[u];
+  for (let v = 0, q; v < e.length; v++) {
+    q = f[v];
     g && q.length && !q[0].doc && q.length && (q = ta.call(this, q));
     if (t) {
       return q;
     }
-    f[u] = {field:d[u], result:q};
+    f[v] = {field:e[v], result:q};
   }
   return h ? va(f, c) : f;
 };
 function va(a, c) {
-  const b = [], e = y();
-  for (let f = 0, d, g; f < a.length; f++) {
-    d = a[f];
-    g = d.result;
-    for (let h = 0, k, n, l; h < g.length; h++) {
-      if (n = g[h], k = n.id, l = e[k]) {
-        l.push(d.field);
+  const b = [], d = y();
+  for (let f = 0, e, g; f < a.length; f++) {
+    e = a[f];
+    g = e.result;
+    for (let h = 0, k, m, l; h < g.length; h++) {
+      if (m = g[h], k = m.id, l = d[k]) {
+        l.push(e.field);
       } else {
         if (b.length === c) {
           return b;
         }
-        n.field = e[k] = [d.field];
-        b.push(n);
+        m.field = d[k] = [e.field];
+        b.push(m);
       }
     }
   }
   return b;
 }
-function sa(a, c, b, e, f) {
-  let d = this.tag.get(a);
-  if (!d) {
+function sa(a, c, b, d, f) {
+  let e = this.tag.get(a);
+  if (!e) {
     return console.warn("Tag '" + a + "' was not found"), [];
   }
-  if ((a = (d = d && d.get(c)) && d.length - e) && 0 < a) {
-    if (a > b || e) {
-      d = d.slice(e, e + b);
+  if ((a = (e = e && e.get(c)) && e.length - d) && 0 < a) {
+    if (a > b || d) {
+      e = e.slice(d, d + b);
     }
-    f && (d = ta.call(this, d));
-    return d;
+    f && (e = ta.call(this, e));
+    return e;
   }
 }
 function ta(a) {
   const c = Array(a.length);
-  for (let b = 0, e; b < a.length; b++) {
-    e = a[b], c[b] = {id:e, doc:this.store.get(e)};
+  for (let b = 0, d; b < a.length; b++) {
+    d = a[b], c[b] = {id:d, doc:this.store.get(d)};
   }
   return c;
 }
@@ -930,93 +980,93 @@ function ta(a) {
   }
   const c = a.document || a.doc || a;
   var b;
-  this.C = [];
+  this.A = [];
   this.field = [];
-  this.G = [];
-  this.key = (b = c.key || c.id) && Z(b, this.G) || "id";
-  this.h = (this.fastupdate = !!a.fastupdate) ? new Map() : new Set();
-  this.A = (b = c.store || null) && !0 !== b && [];
+  this.D = [];
+  this.key = (b = c.key || c.id) && Z(b, this.D) || "id";
+  this.reg = (this.fastupdate = !!a.fastupdate) ? new Map() : new Set();
+  this.h = (b = c.store || null) && !0 !== b && [];
   this.store = b && new Map();
   this.async = !1;
   b = new Map();
-  let e = c.index || c.field || c;
-  z(e) && (e = [e]);
-  for (let f = 0, d, g; f < e.length; f++) {
-    d = e[f], z(d) || (g = d, d = d.field), g = E(g) ? Object.assign({}, a, g) : a, b.set(d, new O(g, this.h)), g.custom ? this.C[f] = g.custom : (this.C[f] = Z(d, this.G), g.filter && ("string" === typeof this.C[f] && (this.C[f] = new String(this.C[f])), this.C[f].J = g.filter)), this.field[f] = d;
+  let d = c.index || c.field || c;
+  z(d) && (d = [d]);
+  for (let f = 0, e, g; f < d.length; f++) {
+    e = d[f], z(e) || (g = e, e = e.field), g = E(g) ? Object.assign({}, a, g) : a, b.set(e, new O(g, this.reg)), g.custom ? this.A[f] = g.custom : (this.A[f] = Z(e, this.D), g.filter && ("string" === typeof this.A[f] && (this.A[f] = new String(this.A[f])), this.A[f].H = g.filter)), this.field[f] = e;
   }
-  if (this.A) {
+  if (this.h) {
     a = c.store;
     z(a) && (a = [a]);
-    for (let f = 0, d, g; f < a.length; f++) {
-      d = a[f], g = d.field || d, d.custom ? (this.A[f] = d.custom, d.custom.L = g) : (this.A[f] = Z(g, this.G), d.filter && ("string" === typeof this.A[f] && (this.A[f] = new String(this.A[f])), this.A[f].J = d.filter));
+    for (let f = 0, e, g; f < a.length; f++) {
+      e = a[f], g = e.field || e, e.custom ? (this.h[f] = e.custom, e.custom.J = g) : (this.h[f] = Z(g, this.D), e.filter && ("string" === typeof this.h[f] && (this.h[f] = new String(this.h[f])), this.h[f].H = e.filter));
     }
   }
   this.index = b;
 }
 function Z(a, c) {
   const b = a.split(":");
-  let e = 0;
+  let d = 0;
   for (let f = 0; f < b.length; f++) {
-    a = b[f], "]" === a[a.length - 1] && (a = a.substring(0, a.length - 2)) && (c[e] = !0), a && (b[e++] = a);
+    a = b[f], "]" === a[a.length - 1] && (a = a.substring(0, a.length - 2)) && (c[d] = !0), a && (b[d++] = a);
   }
-  e < b.length && (b.length = e);
-  return 1 < e ? b : b[0];
+  d < b.length && (b.length = d);
+  return 1 < d ? b : b[0];
 }
-v = W.prototype;
-v.append = function(a, c) {
+u = W.prototype;
+u.append = function(a, c) {
   return this.add(a, c, !0);
 };
-v.update = function(a, c) {
+u.update = function(a, c) {
   return this.remove(a).add(a, c);
 };
-v.remove = function(a) {
+u.remove = function(a) {
   E(a) && (a = F(a, this.key));
   for (const c of this.index.values()) {
     c.remove(a, !0);
   }
-  this.h.has(a) && (this.store && this.store.delete(a), this.h.delete(a));
+  this.reg.has(a) && (this.store && this.store.delete(a), this.reg.delete(a));
   return this;
 };
-v.clear = function() {
+u.clear = function() {
   for (const a of this.index.values()) {
     a.clear();
   }
   this.store && this.store.clear();
   return this;
 };
-v.contain = function(a) {
-  return this.h.has(a);
+u.contain = function(a) {
+  return this.reg.has(a);
 };
-v.cleanup = function() {
+u.cleanup = function() {
   for (const a of this.index.values()) {
     a.cleanup();
   }
   return this;
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-v.get = function(a) {
+u.get = function(a) {
   return this.store.get(a);
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-v.set = function(a, c) {
+u.set = function(a, c) {
   this.store.set(a, c);
   return this;
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-v.export = function(a, c, b, e, f, d) {
+u.export = function(a, c, b, d, f, e) {
   let g;
-  "undefined" === typeof d && (g = new Promise(k => {
-    d = k;
+  "undefined" === typeof e && (g = new Promise(k => {
+    e = k;
   }));
   f || (f = 0);
-  e || (e = 0);
-  if (e < this.field.length) {
-    b = this.field[e];
+  d || (d = 0);
+  if (d < this.field.length) {
+    b = this.field[d];
     var h = this.index[b];
     c = this;
-    h.export(a, c, f ? b : "", e, f++, d) || (e++, c.export(a, c, b, e, 1, d));
+    h.export(a, c, f ? b : "", d, f++, e) || (d++, c.export(a, c, b, d, 1, e));
   } else {
     switch(f) {
       case 1:
         c = "tag";
-        h = this.D;
+        h = this.B;
         b = null;
         break;
       case 2:
@@ -1025,24 +1075,24 @@ v.export = function(a, c, b, e, f, d) {
         b = null;
         break;
       default:
-        d();
+        e();
         return;
     }
-    na(a, this, b, c, e, f, h, d);
+    na(a, this, b, c, d, f, h, e);
   }
   return g;
 };
-v.import = function(a, c) {
+u.import = function(a, c) {
   if (c) {
     switch(z(c) && (c = JSON.parse(c)), a) {
       case "tag":
-        this.D = c;
+        this.B = c;
         break;
       case "reg":
         this.fastupdate = !1;
-        this.h = c;
-        for (let e = 0, f; e < this.field.length; e++) {
-          f = this.index[this.field[e]], f.h = c, f.fastupdate = !1;
+        this.reg = c;
+        for (let d = 0, f; d < this.field.length; d++) {
+          f = this.index[this.field[d]], f.reg = c, f.fastupdate = !1;
         }
         break;
       case "store":
diff --git a/dist/flexsearch.compact.module.min.js b/dist/flexsearch.compact.module.min.js
index 9ffb669..5b761ee 100644
--- a/dist/flexsearch.compact.module.min.js
+++ b/dist/flexsearch.compact.module.min.js
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+function ra(a,c,b,d,e,f,g){let h=[];if(a){d=Math.min(a.length,d);for(let k=0,m=0,l;k<d;k++)if(l=a[k])if(f&&l&&g&&(l.length<=f?(f-=l.length,l=null):(l=l.slice(f),f=0)),l&&(h[k]=l,g&&(m+=l.length,m>=e)))break;if(h.length){if(g)return R(h,e,0);c.push(h);return}}return!b&&h}function T(a,c,b){let d;b&&(d=a.bidirectional&&c>b);a=b?(a=a.ctx.get(d?c:b))&&a.get(d?b:c):a.map.get(c);return a};N.prototype.remove=function(a,c){const b=this.reg.size&&(this.fastupdate?this.reg.get(a):this.reg.has(a));if(b){if(this.fastupdate)for(let d=0,e;d<b.length;d++){if(e=b[d])if(2>e.length)e.pop();else{const f=e.indexOf(a);f===b.length-1?e.pop():e.splice(f,1)}}else U(this.map,a),this.depth&&U(this.ctx,a);c||this.reg.delete(a)}return this};
+function U(a,c){let b=0;if(a.constructor===Array)for(let d=0,e,f;d<a.length;d++){if((e=a[d])&&e.length)if(f=e.indexOf(c),0<=f){1<e.length?(e.splice(f,1),b++):delete a[d];break}else b++}else for(let d of a){const e=d[0],f=U(d[1],c);f?b+=f:a.delete(e)}return b};function N(a,c){if(!this)return new N(a);if(a){var b=A(a)?a:a.preset;b&&(a=Object.assign({},oa[b],a))}else a={};b=a.context||{};const d=a.encode||a.encoder||J;this.encoder=d.encode?d:"object"===typeof d?new I(d):{encode:d};let e;this.resolution=a.resolution||9;this.tokenize=e=a.tokenize||"strict";this.depth="strict"===e&&b.depth||0;this.bidirectional=!1!==b.bidirectional;this.fastupdate=!!a.fastupdate;this.score=a.score||null;this.map=new Map;this.ctx=new Map;this.reg=c||(this.fastupdate?new Map:
+new Set);this.I=b.resolution||1;this.rtl=d.rtl||a.rtl||!1}u=N.prototype;u.clear=function(){this.map.clear();this.ctx.clear();this.reg.clear();return this};u.append=function(a,c){return this.add(a,c,!0)};u.contain=function(a){return this.reg.has(a)};u.update=function(a,c){if(this.async){const b=this,d=this.remove(a);return d.then?d.then(()=>b.add(a,c)):this.add(a,c)}return this.remove(a).add(a,c)};
+function V(a){let c=0;if(a.constructor===Array)for(let b=0,d;b<a.length;b++)(d=a[b])&&(c+=d.length);else for(const b of a){const d=b[0],e=V(b[1]);e?c+=e:a.delete(d)}return c}u.cleanup=function(){if(!this.fastupdate)return this;V(this.map);this.depth&&V(this.ctx);return this};
+u.export=function(a,c,b,d,e,f){let g=!0;"undefined"===typeof f&&(g=new Promise(m=>{f=m}));let h,k;switch(e||(e=0)){case 0:h="reg";if(this.fastupdate){k=y();for(let m of this.reg.keys())k[m]=1}else k=this.reg;break;case 1:h="cfg";k={doc:0,opt:this.C?1:0};break;case 2:h="map";k=this.map;break;case 3:h="ctx";k=this.ctx;break;default:"undefined"===typeof b&&f&&f();return}na(a,c||this,b,h,d,e,k,f);return g};
+u.import=function(a,c){if(c)switch(A(c)&&(c=JSON.parse(c)),a){case "cfg":this.C=!!c.opt;break;case "reg":this.fastupdate=!1;this.reg=c;break;case "map":this.map=c;break;case "ctx":this.ctx=c}};
+u.serialize=function(a=!0){if(!this.reg.size)return"";let c="",b="";for(var d of this.reg.keys())b||(b=typeof d),c+=(c?",":"")+("string"===b?'"'+d+'"':d);c="index.reg=new Set(["+c+"]);";d="";for(var e of this.map.entries()){var f=e[0],g=e[1],h="";for(let l=0,r;l<g.length;l++){r=g[l]||[""];var k="";for(var m=0;m<r.length;m++)k+=(k?",":"")+("string"===b?'"'+r[m]+'"':r[m]);k="["+k+"]";h+=(h?",":"")+k}h='["'+f+'",['+h+"]]";d+=(d?",":"")+h}d="index.map=new Map(["+d+"]);";e="";for(const l of this.ctx.entries()){f=
+l[0];g=l[1];for(const r of g.entries()){g=r[0];h=r[1];k="";for(let t=0,p;t<h.length;t++){p=h[t]||[""];m="";for(let n=0;n<p.length;n++)m+=(m?",":"")+("string"===b?'"'+p[n]+'"':p[n]);m="["+m+"]";k+=(k?",":"")+m}k='new Map([["'+g+'",['+k+"]]])";k='["'+f+'",'+k+"]";e+=(e?",":"")+k}}e="index.ctx=new Map(["+e+"]);";return a?"function inject(index){"+c+d+e+"}":c+d+e};pa(N.prototype);W.prototype.add=function(a,c,b){E(a)&&(c=a,a=F(c,this.key));if(c&&(a||0===a)){if(!b&&this.reg.has(a))return this.update(a,c);for(let e=0,f;e<this.field.length;e++){f=this.A[e];const g=this.index.get(this.field[e]);if("function"===typeof f){var d=f(c);d&&g.add(a,d,!1,!0)}else if(d=f.H,!d||d(c))f.constructor===String?f=[""+f]:A(f)&&(f=[f]),X(c,f,this.D,0,g,a,f[0],b)}if(this.store&&(!b||!this.store.has(a))){let e;if(this.h){e=y();for(let f=0,g;f<this.h.length;f++){g=this.h[f];if((b=g.H)&&!b(c))continue;
+let h;if("function"===typeof g){h=g(c);if(!h)continue;g=[g.J]}else if(A(g)||g.constructor===String){e[g]=c[g];continue}Y(c,e,g,0,g[0],h)}}this.store.set(a,e||c)}}return this};function Y(a,c,b,d,e,f){a=a[e];if(d===b.length-1)c[e]=f||a;else if(a)if(a.constructor===Array)for(c=c[e]=Array(a.length),e=0;e<a.length;e++)Y(a,c,b,d,e);else c=c[e]||(c[e]=y()),e=b[++d],Y(a,c,b,d,e)}
+function X(a,c,b,d,e,f,g,h){if(a=a[g])if(d===c.length-1){if(a.constructor===Array){if(b[d]){for(c=0;c<a.length;c++)e.add(f,a[c],!0,!0);return}a=a.join(" ")}e.add(f,a,h,!0)}else if(a.constructor===Array)for(g=0;g<a.length;g++)X(a,c,b,d,e,f,g,h);else g=c[++d],X(a,c,b,d,e,f,g,h)};W.prototype.search=function(a,c,b,d){b||(!c&&E(a)?(b=a,a=""):E(c)&&(b=c,c=0));let e=[];var f=[];let g,h,k,m,l;let r=0;if(b){b.constructor===Array&&(b={index:b});a=b.query||a;var t=b.pluck;h=b.merge;m=t||b.field||b.index;l=!1;g=this.store&&b.enrich;k=b.suggest;c=b.limit||c;var p=b.offset||0;c||(c=100);if(l){l.constructor!==Array&&(l=[l]);var n=[];for(let v=0,q;v<l.length;v++)if(q=l[v],q.field&&q.tag){var w=q.tag;if(w.constructor===Array)for(var B=0;B<w.length;B++)n.push(q.field,w[B]);else n.push(q.field,
+w)}else{w=Object.keys(q);for(let C=0,D,z;C<w.length;C++)if(D=w[C],z=q[D],z.constructor===Array)for(B=0;B<z.length;B++)n.push(D,z[B]);else n.push(D,z)}l=n;if(!a){d=[];if(n.length)for(f=0;f<n.length;f+=2)t=sa.call(this,n[f],n[f+1],c,p,g),e.push({field:n[f],tag:n[f+1],result:t});return d.length?Promise.all(d).then(function(v){for(let q=0;q<v.length;q++)e[q].result=v[q];return e}):e}}A(m)&&(m=[m])}m||(m=this.field);p=!d&&(this.worker||this.async)&&[];for(let v=0,q,C,D;v<m.length;v++){C=m[v];let z;A(C)||
+(z=C,C=z.field,a=z.query||a,c=z.limit||c,k=z.suggest||k);if(d)q=d[v];else if(n=z||b,w=this.index.get(C),l&&(n.enrich=!1),p){p[v]=w.searchAsync(a,c,n);n&&g&&(n.enrich=g);continue}else q=w.search(a,c,n),n&&g&&(n.enrich=g);D=q&&q.length;if(l&&D){n=[];w=0;for(let O=0,G,ua;O<l.length;O+=2){G=this.tag.get(l[O]);if(!G)if(k)continue;else return e;if(ua=(G=G&&G.get(l[O+1]))&&G.length)w++,n.push(G);else if(!k)return e}if(w){q=qa(q,n);D=q.length;if(!D&&!k)return e;w--}}if(D)f[r]=C,e.push(q),r++;else if(1===
+m.length)return e}if(p){const v=this;return Promise.all(p).then(function(q){return q.length?v.search(a,c,b,q):q})}if(!r)return e;if(t&&(!g||!this.store))return e[0];p=[];for(let v=0,q;v<f.length;v++){q=e[v];g&&q.length&&!q[0].doc&&q.length&&(q=ta.call(this,q));if(t)return q;e[v]={field:f[v],result:q}}return h?va(e,c):e};
+function va(a,c){const b=[],d=y();for(let e=0,f,g;e<a.length;e++){f=a[e];g=f.result;for(let h=0,k,m,l;h<g.length;h++)if(m=g[h],k=m.id,l=d[k])l.push(f.field);else{if(b.length===c)return b;m.field=d[k]=[f.field];b.push(m)}}return b}function sa(a,c,b,d,e){a=this.tag.get(a);if(!a)return[];if((c=(a=a&&a.get(c))&&a.length-d)&&0<c){if(c>b||d)a=a.slice(d,d+b);e&&(a=ta.call(this,a));return a}}
+function ta(a){const c=Array(a.length);for(let b=0,d;b<a.length;b++)d=a[b],c[b]={id:d,doc:this.store.get(d)};return c};function W(a){if(!this)return new W(a);const c=a.document||a.doc||a;var b;this.A=[];this.field=[];this.D=[];this.key=(b=c.key||c.id)&&Z(b,this.D)||"id";this.reg=(this.fastupdate=!!a.fastupdate)?new Map:new Set;this.h=(b=c.store||null)&&!0!==b&&[];this.store=b&&new Map;this.async=!1;b=new Map;let d=c.index||c.field||c;A(d)&&(d=[d]);for(let e=0,f,g;e<d.length;e++)f=d[e],A(f)||(g=f,f=f.field),g=E(g)?Object.assign({},a,g):a,b.set(f,new N(g,this.reg)),g.custom?this.A[e]=g.custom:(this.A[e]=Z(f,this.D),
+g.filter&&("string"===typeof this.A[e]&&(this.A[e]=new String(this.A[e])),this.A[e].H=g.filter)),this.field[e]=f;if(this.h){a=c.store;A(a)&&(a=[a]);for(let e=0,f,g;e<a.length;e++)f=a[e],g=f.field||f,f.custom?(this.h[e]=f.custom,f.custom.J=g):(this.h[e]=Z(g,this.D),f.filter&&("string"===typeof this.h[e]&&(this.h[e]=new String(this.h[e])),this.h[e].H=f.filter))}this.index=b}
+function Z(a,c){const b=a.split(":");let d=0;for(let e=0;e<b.length;e++)a=b[e],"]"===a[a.length-1]&&(a=a.substring(0,a.length-2))&&(c[d]=!0),a&&(b[d++]=a);d<b.length&&(b.length=d);return 1<d?b:b[0]}u=W.prototype;u.append=function(a,c){return this.add(a,c,!0)};u.update=function(a,c){return this.remove(a).add(a,c)};u.remove=function(a){E(a)&&(a=F(a,this.key));for(const c of this.index.values())c.remove(a,!0);this.reg.has(a)&&(this.store&&this.store.delete(a),this.reg.delete(a));return this};
+u.clear=function(){for(const a of this.index.values())a.clear();this.store&&this.store.clear();return this};u.contain=function(a){return this.reg.has(a)};u.cleanup=function(){for(const a of this.index.values())a.cleanup();return this};u.get=function(a){return this.store.get(a)};u.set=function(a,c){this.store.set(a,c);return this};
+u.export=function(a,c,b,d,e,f){let g;"undefined"===typeof f&&(g=new Promise(k=>{f=k}));e||(e=0);d||(d=0);if(d<this.field.length){b=this.field[d];var h=this.index[b];c=this;h.export(a,c,e?b:"",d,e++,f)||(d++,c.export(a,c,b,d,1,f))}else{switch(e){case 1:c="tag";h=this.B;b=null;break;case 2:c="store";h=this.store;b=null;break;default:f();return}na(a,this,b,c,d,e,h,f)}return g};
+u.import=function(a,c){if(c)switch(A(c)&&(c=JSON.parse(c)),a){case "tag":this.B=c;break;case "reg":this.fastupdate=!1;this.reg=c;for(let d=0,e;d<this.field.length;d++)e=this.index[this.field[d]],e.reg=c,e.fastupdate=!1;break;case "store":this.store=c;break;default:a=a.split(".");const b=a[0];a=a[1];b&&a&&this.index[b].import(a,c)}};pa(W.prototype);export default {Index:N,Charset:ma,Encoder:I,Document:W,Worker:null,Resolver:null,IndexedDB:null,Language:{}};
 export const Index=N;export const Charset=ma;export const Encoder=I;export const Document=W;export const Worker=null;export const Resolver=null;export const IndexedDB=null;export const Language={};
\ No newline at end of file
diff --git a/dist/flexsearch.es5.debug.js b/dist/flexsearch.es5.debug.js
index 8878165..e3a8d94 100644
--- a/dist/flexsearch.es5.debug.js
+++ b/dist/flexsearch.es5.debug.js
@@ -85,29 +85,29 @@ if ("function" == typeof Object.setPrototypeOf) {
 }
 var ia = da;
 function ja() {
-  this.D = !1;
+  this.C = !1;
   this.A = null;
-  this.G = void 0;
+  this.F = void 0;
   this.h = 1;
-  this.L = 0;
-  this.C = null;
+  this.J = 0;
+  this.B = null;
 }
 function ka(a) {
-  if (a.D) {
+  if (a.C) {
     throw new TypeError("Generator is already running");
   }
-  a.D = !0;
+  a.C = !0;
 }
-ja.prototype.H = function(a) {
-  this.G = a;
+ja.prototype.G = function(a) {
+  this.F = a;
 };
 function la(a, b) {
-  a.C = {qa:b, ra:!0};
-  a.h = a.L;
+  a.B = {oa:b, pa:!0};
+  a.h = a.J;
 }
 ja.prototype.return = function(a) {
-  this.C = {return:a};
-  this.h = this.L;
+  this.B = {return:a};
+  this.h = this.J;
 };
 function F(a, b, c) {
   a.h = c;
@@ -135,7 +135,7 @@ function oa(a, b, c, d) {
       throw new TypeError("Iterator result " + e + " is not an object");
     }
     if (!e.done) {
-      return a.h.D = !1, e;
+      return a.h.C = !1, e;
     }
     var g = e.value;
   } catch (f) {
@@ -150,18 +150,18 @@ function G(a) {
     try {
       var b = a.A(a.h);
       if (b) {
-        return a.h.D = !1, {value:b.value, done:!1};
+        return a.h.C = !1, {value:b.value, done:!1};
       }
     } catch (c) {
-      a.h.G = void 0, la(a.h, c);
+      a.h.F = void 0, la(a.h, c);
     }
   }
-  a.h.D = !1;
-  if (a.h.C) {
-    b = a.h.C;
-    a.h.C = null;
-    if (b.ra) {
-      throw b.qa;
+  a.h.C = !1;
+  if (a.h.B) {
+    b = a.h.B;
+    a.h.B = null;
+    if (b.pa) {
+      throw b.oa;
     }
     return {value:b.return, done:!0};
   }
@@ -170,12 +170,12 @@ function G(a) {
 function pa(a) {
   this.next = function(b) {
     ka(a.h);
-    a.h.A ? b = oa(a, a.h.A.next, b, a.h.H) : (a.h.H(b), b = G(a));
+    a.h.A ? b = oa(a, a.h.A.next, b, a.h.G) : (a.h.G(b), b = G(a));
     return b;
   };
   this.throw = function(b) {
     ka(a.h);
-    a.h.A ? b = oa(a, a.h.A["throw"], b, a.h.H) : (la(a.h, b), b = G(a));
+    a.h.A ? b = oa(a, a.h.A["throw"], b, a.h.G) : (la(a.h, b), b = G(a));
     return b;
   };
   this.return = function(b) {
@@ -250,10 +250,10 @@ function ta(a) {
 B("Promise", function(a) {
   function b(f) {
     this.A = 0;
-    this.C = void 0;
+    this.B = void 0;
     this.h = [];
-    this.L = !1;
-    var h = this.D();
+    this.J = !1;
+    var h = this.C();
     try {
       f(h.resolve, h.reject);
     } catch (k) {
@@ -275,17 +275,17 @@ B("Promise", function(a) {
     if (null == this.h) {
       this.h = [];
       var h = this;
-      this.C(function() {
-        h.G();
+      this.B(function() {
+        h.F();
       });
     }
     this.h.push(f);
   };
   var e = z.setTimeout;
-  c.prototype.C = function(f) {
+  c.prototype.B = function(f) {
     e(f, 0);
   };
-  c.prototype.G = function() {
+  c.prototype.F = function() {
     for (; this.h && this.h.length;) {
       var f = this.h;
       this.h = [];
@@ -295,32 +295,32 @@ B("Promise", function(a) {
         try {
           k();
         } catch (l) {
-          this.D(l);
+          this.C(l);
         }
       }
     }
     this.h = null;
   };
-  c.prototype.D = function(f) {
-    this.C(function() {
+  c.prototype.C = function(f) {
+    this.B(function() {
       throw f;
     });
   };
-  b.prototype.D = function() {
+  b.prototype.C = function() {
     function f(l) {
       return function(m) {
         k || (k = !0, l.call(h, m));
       };
     }
     var h = this, k = !1;
-    return {resolve:f(this.ka), reject:f(this.G)};
+    return {resolve:f(this.ia), reject:f(this.F)};
   };
-  b.prototype.ka = function(f) {
+  b.prototype.ia = function(f) {
     if (f === this) {
-      this.G(new TypeError("A Promise cannot resolve to itself"));
+      this.F(new TypeError("A Promise cannot resolve to itself"));
     } else {
       if (f instanceof b) {
-        this.ma(f);
+        this.ka(f);
       } else {
         a: {
           switch(typeof f) {
@@ -334,46 +334,46 @@ B("Promise", function(a) {
               h = !1;
           }
         }
-        h ? this.ja(f) : this.H(f);
+        h ? this.ha(f) : this.G(f);
       }
     }
   };
-  b.prototype.ja = function(f) {
+  b.prototype.ha = function(f) {
     var h = void 0;
     try {
       h = f.then;
     } catch (k) {
-      this.G(k);
+      this.F(k);
       return;
     }
-    "function" == typeof h ? this.na(h, f) : this.H(f);
+    "function" == typeof h ? this.la(h, f) : this.G(f);
+  };
+  b.prototype.F = function(f) {
+    this.da(2, f);
   };
   b.prototype.G = function(f) {
-    this.fa(2, f);
+    this.da(1, f);
   };
-  b.prototype.H = function(f) {
-    this.fa(1, f);
-  };
-  b.prototype.fa = function(f, h) {
+  b.prototype.da = function(f, h) {
     if (0 != this.A) {
       throw Error("Cannot settle(" + f + ", " + h + "): Promise already settled in state" + this.A);
     }
     this.A = f;
-    this.C = h;
-    2 === this.A && this.la();
-    this.ha();
+    this.B = h;
+    2 === this.A && this.ja();
+    this.fa();
   };
-  b.prototype.la = function() {
+  b.prototype.ja = function() {
     var f = this;
     e(function() {
-      if (f.ia()) {
+      if (f.ga()) {
         var h = z.console;
-        "undefined" !== typeof h && h.error(f.C);
+        "undefined" !== typeof h && h.error(f.B);
       }
     }, 1);
   };
-  b.prototype.ia = function() {
-    if (this.L) {
+  b.prototype.ga = function() {
+    if (this.J) {
       return !1;
     }
     var f = z.CustomEvent, h = z.Event, k = z.dispatchEvent;
@@ -382,10 +382,10 @@ B("Promise", function(a) {
     }
     "function" === typeof f ? f = new f("unhandledrejection", {cancelable:!0}) : "function" === typeof h ? f = new h("unhandledrejection", {cancelable:!0}) : (f = z.document.createEvent("CustomEvent"), f.initCustomEvent("unhandledrejection", !1, !0, f));
     f.promise = this;
-    f.reason = this.C;
+    f.reason = this.B;
     return k(f);
   };
-  b.prototype.ha = function() {
+  b.prototype.fa = function() {
     if (null != this.h) {
       for (var f = 0; f < this.h.length; ++f) {
         g.A(this.h[f]);
@@ -394,12 +394,12 @@ B("Promise", function(a) {
     }
   };
   var g = new c();
-  b.prototype.ma = function(f) {
-    var h = this.D();
-    f.Y(h.resolve, h.reject);
+  b.prototype.ka = function(f) {
+    var h = this.C();
+    f.W(h.resolve, h.reject);
   };
-  b.prototype.na = function(f, h) {
-    var k = this.D();
+  b.prototype.la = function(f, h) {
+    var k = this.C();
     try {
       f.call(h, k.resolve, k.reject);
     } catch (l) {
@@ -420,20 +420,20 @@ B("Promise", function(a) {
       l = p;
       m = q;
     });
-    this.Y(k(f, l), k(h, m));
+    this.W(k(f, l), k(h, m));
     return n;
   };
   b.prototype.catch = function(f) {
     return this.then(void 0, f);
   };
-  b.prototype.Y = function(f, h) {
+  b.prototype.W = function(f, h) {
     function k() {
       switch(l.A) {
         case 1:
-          f(l.C);
+          f(l.B);
           break;
         case 2:
-          h(l.C);
+          h(l.B);
           break;
         default:
           throw Error("Unexpected state: " + l.A);
@@ -441,7 +441,7 @@ B("Promise", function(a) {
     }
     var l = this;
     null == this.h ? g.A(k) : this.h.push(k);
-    this.L = !0;
+    this.J = !0;
   };
   b.resolve = d;
   b.reject = function(f) {
@@ -452,7 +452,7 @@ B("Promise", function(a) {
   b.race = function(f) {
     return new b(function(h, k) {
       for (var l = x(f), m = l.next(); !m.done; m = l.next()) {
-        d(m.value).Y(h, k);
+        d(m.value).W(h, k);
       }
     });
   };
@@ -468,7 +468,7 @@ B("Promise", function(a) {
       }
       var p = [], q = 0;
       do {
-        p.push(void 0), q++, d(k.value).Y(n(p.length - 1), m), k = h.next();
+        p.push(void 0), q++, d(k.value).W(n(p.length - 1), m), k = h.next();
       } while (!k.done);
     });
   };
@@ -579,14 +579,14 @@ B("WeakMap", function(a) {
 B("Map", function(a) {
   function b() {
     var h = {};
-    return h.K = h.next = h.head = h;
+    return h.I = h.next = h.head = h;
   }
   function c(h, k) {
     var l = h[1];
     return ta(function() {
       if (l) {
         for (; l.head != h[1];) {
-          l = l.K;
+          l = l.I;
         }
         for (; l.next != l.head;) {
           return l = l.next, {done:!1, value:k(l)};
@@ -604,11 +604,11 @@ B("Map", function(a) {
       for (h = 0; h < m.length; h++) {
         var n = m[h];
         if (k !== k && n.key !== n.key || k === n.key) {
-          return {id:l, list:m, index:h, F:n};
+          return {id:l, list:m, index:h, D:n};
         }
       }
     }
-    return {id:l, list:m, index:-1, F:void 0};
+    return {id:l, list:m, index:-1, D:void 0};
   }
   function e(h) {
     this[0] = {};
@@ -647,23 +647,23 @@ B("Map", function(a) {
     h = 0 === h ? 0 : h;
     var l = d(this, h);
     l.list || (l.list = this[0][l.id] = []);
-    l.F ? l.F.value = k : (l.F = {next:this[1], K:this[1].K, head:this[1], key:h, value:k}, l.list.push(l.F), this[1].K.next = l.F, this[1].K = l.F, this.size++);
+    l.D ? l.D.value = k : (l.D = {next:this[1], I:this[1].I, head:this[1], key:h, value:k}, l.list.push(l.D), this[1].I.next = l.D, this[1].I = l.D, this.size++);
     return this;
   };
   e.prototype.delete = function(h) {
     h = d(this, h);
-    return h.F && h.list ? (h.list.splice(h.index, 1), h.list.length || delete this[0][h.id], h.F.K.next = h.F.next, h.F.next.K = h.F.K, h.F.head = null, this.size--, !0) : !1;
+    return h.D && h.list ? (h.list.splice(h.index, 1), h.list.length || delete this[0][h.id], h.D.I.next = h.D.next, h.D.next.I = h.D.I, h.D.head = null, this.size--, !0) : !1;
   };
   e.prototype.clear = function() {
     this[0] = {};
-    this[1] = this[1].K = b();
+    this[1] = this[1].I = b();
     this.size = 0;
   };
   e.prototype.has = function(h) {
-    return !!d(this, h).F;
+    return !!d(this, h).D;
   };
   e.prototype.get = function(h) {
-    return (h = d(this, h).F) && h.value;
+    return (h = d(this, h).D) && h.value;
   };
   e.prototype.entries = function() {
     return c(this, function(h) {
@@ -958,20 +958,20 @@ N.prototype.assign = function(a) {
   this.minlength = I(a.minlength, 1, this.minlength);
   this.maxlength = I(a.maxlength, 0, this.maxlength);
   if (this.cache = c = I(a.cache, !0, this.cache)) {
-    this.X = null, this.L = "number" === typeof c ? c : 2e5, this.P = new Map(), this.V = new Map(), this.A = this.h = 128;
+    this.V = null, this.J = "number" === typeof c ? c : 2e5, this.N = new Map(), this.T = new Map(), this.A = this.h = 128;
   }
+  this.B = "";
+  this.F = null;
   this.C = "";
   this.G = null;
-  this.D = "";
-  this.H = null;
   if (this.matcher) {
     for (a = x(this.matcher.keys()), b = a.next(); !b.done; b = a.next()) {
-      this.C += (this.C ? "|" : "") + b.value;
+      this.B += (this.B ? "|" : "") + b.value;
     }
   }
   if (this.stemmer) {
     for (a = x(this.stemmer.keys()), b = a.next(); !b.done; b = a.next()) {
-      this.D += (this.D ? "|" : "") + b.value;
+      this.C += (this.C ? "|" : "") + b.value;
     }
   }
   return this;
@@ -979,12 +979,12 @@ N.prototype.assign = function(a) {
 N.prototype.encode = function(a) {
   var b = this;
   if (this.cache && a.length <= this.h) {
-    if (this.X) {
-      if (this.P.has(a)) {
-        return this.P.get(a);
+    if (this.V) {
+      if (this.N.has(a)) {
+        return this.N.get(a);
       }
     } else {
-      this.X = setTimeout(Ga, 0, this);
+      this.V = setTimeout(Ga, 0, this);
     }
   }
   this.normalize && (a = "function" === typeof this.normalize ? this.normalize(a) : Fa ? a.normalize("NFKD").replace(Fa, "").toLowerCase() : a.toLowerCase());
@@ -997,21 +997,21 @@ N.prototype.encode = function(a) {
       } else {
         if (!this.filter || !this.filter.has(f)) {
           if (this.cache && f.length <= this.A) {
-            if (this.X) {
-              var k = this.V.get(f);
+            if (this.V) {
+              var k = this.T.get(f);
               if (k || "" === k) {
                 k && d.push(k);
                 continue;
               }
             } else {
-              this.X = setTimeout(Ga, 0, this);
+              this.V = setTimeout(Ga, 0, this);
             }
           }
           k = void 0;
-          this.stemmer && 2 < f.length && (this.H || (this.H = new RegExp("(?!^)(" + this.D + ")$")), f = f.replace(this.H, function(q) {
+          this.stemmer && 2 < f.length && (this.G || (this.G = new RegExp("(?!^)(" + this.C + ")$")), f = f.replace(this.G, function(q) {
             return b.stemmer.get(q);
           }), k = 1);
-          this.matcher && 1 < f.length && (this.G || (this.G = new RegExp("(" + this.C + ")", "g")), f = f.replace(this.G, function(q) {
+          this.matcher && 1 < f.length && (this.F || (this.F = new RegExp("(" + this.B + ")", "g")), f = f.replace(this.F, function(q) {
             return b.matcher.get(q);
           }), k = 1);
           f && k && (f.length < this.minlength || this.filter && this.filter.has(f)) && (f = "");
@@ -1027,20 +1027,20 @@ N.prototype.encode = function(a) {
               f = f.replace(this.replacer[k], this.replacer[k + 1]);
             }
           }
-          this.cache && h.length <= this.A && (this.V.set(h, f), this.V.size > this.L && (this.V.clear(), this.A = this.A / 1.1 | 0));
+          this.cache && h.length <= this.A && (this.T.set(h, f), this.T.size > this.J && (this.T.clear(), this.A = this.A / 1.1 | 0));
           f && d.push(f);
         }
       }
     }
   }
   this.finalize && (d = this.finalize(d) || d);
-  this.cache && a.length <= this.h && (this.P.set(a, d), this.P.size > this.L && (this.P.clear(), this.h = this.h / 1.1 | 0));
+  this.cache && a.length <= this.h && (this.N.set(a, d), this.N.size > this.J && (this.N.clear(), this.h = this.h / 1.1 | 0));
   return d;
 };
 function Ga(a) {
-  a.X = null;
-  a.P.clear();
-  a.V.clear();
+  a.V = null;
+  a.N.clear();
+  a.T.clear();
 }
 ;function Ha(a, b, c) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
@@ -1202,7 +1202,7 @@ function S(a) {
     return new S(a);
   }
   this.index = K();
-  this.C = [];
+  this.B = [];
   this.size = 0;
   32 < a ? (this.h = Sa, this.A = BigInt(a)) : (this.h = Ta, this.A = a);
 }
@@ -1212,7 +1212,7 @@ S.prototype.get = function(a) {
 };
 S.prototype.set = function(a, b) {
   var c = this.h(a), d = this.index[c];
-  d ? (c = d.size, d.set(a, b), (c -= d.size) && this.size++) : (this.index[c] = d = new Map([[a, b]]), this.C.push(d));
+  d ? (c = d.size, d.set(a, b), (c -= d.size) && this.size++) : (this.index[c] = d = new Map([[a, b]]), this.B.push(d));
 };
 function T(a) {
   a = void 0 === a ? 8 : a;
@@ -1221,19 +1221,19 @@ function T(a) {
   }
   this.index = K();
   this.h = [];
-  32 < a ? (this.C = Sa, this.A = BigInt(a)) : (this.C = Ta, this.A = a);
+  32 < a ? (this.B = Sa, this.A = BigInt(a)) : (this.B = Ta, this.A = a);
 }
 T.prototype.add = function(a) {
-  var b = this.C(a), c = this.index[b];
+  var b = this.B(a), c = this.index[b];
   c ? (b = c.size, c.add(a), (b -= c.size) && this.size++) : (this.index[b] = c = new Set([a]), this.h.push(c));
 };
 w = S.prototype;
 w.has = T.prototype.has = function(a) {
-  var b = this.C(a);
+  var b = this.B(a);
   return (b = this.index[b]) && b.has(a);
 };
 w.delete = T.prototype.delete = function(a) {
-  var b = this.C(a);
+  var b = this.B(a);
   (b = this.index[b]) && b.delete(a) && this.size--;
 };
 w.clear = T.prototype.clear = function() {
@@ -1362,7 +1362,7 @@ function U(a) {
 ;K();
 V.prototype.add = function(a, b, c, d) {
   if (b && (a || 0 === a)) {
-    if (!d && !c && this.B.has(a)) {
+    if (!d && !c && this.reg.has(a)) {
       return this.update(a, b);
     }
     b = this.encoder.encode(b);
@@ -1399,7 +1399,7 @@ V.prototype.add = function(a, b, c, d) {
               }
             default:
               if (ab(this, g, l, n, a, c), f && 1 < d && k < d - 1) {
-                for (m = K(), p = this.da, n = l, q = Math.min(f + 1, d - k), r = m[n] = 1; r < q; r++) {
+                for (m = K(), p = this.ba, n = l, q = Math.min(f + 1, d - k), r = m[n] = 1; r < q; r++) {
                   if ((l = b[this.rtl ? d - 1 - k - r : k + r]) && !m[l]) {
                     m[l] = 1;
                     var y = this.score ? this.score(b, n, k, l, r) : $a(p + (d / 2 > p ? 0 : 1), d, k, q - 1, r - 1), u = this.bidirectional && l > n;
@@ -1410,29 +1410,29 @@ V.prototype.add = function(a, b, c, d) {
           }
         }
       }
-      this.fastupdate || this.B.add(a);
+      this.fastupdate || this.reg.add(a);
     } else {
       b = "";
     }
   }
-  this.db && (b || this.R.push({del:a}), this.ga && bb(this));
+  this.db && (b || this.O.push({del:a}), this.ea && bb(this));
   return this;
 };
 function ab(a, b, c, d, e, g, f) {
-  var h = f ? a.J : a.map, k;
+  var h = f ? a.ctx : a.map, k;
   if (!b[c] || !f || !(k = b[c])[f]) {
     if (f ? (b = k || (b[c] = K()), b[f] = 1, (k = h.get(f)) ? h = k : h.set(f, h = new Map())) : b[c] = 1, (k = h.get(c)) ? h = k : h.set(c, h = k = []), h = h[d] || (h[d] = []), !g || !h.includes(e)) {
       if (h.length === Math.pow(2, 31) - 1) {
         b = new R(h);
         if (a.fastupdate) {
-          for (c = x(a.B.values()), g = c.next(); !g.done; g = c.next()) {
+          for (c = x(a.reg.values()), g = c.next(); !g.done; g = c.next()) {
             g = g.value, g.includes(h) && (g[g.indexOf(h)] = b);
           }
         }
         k[d] = h = b;
       }
       h.push(e);
-      a.fastupdate && ((d = a.B.get(e)) ? d.push(h) : a.B.set(e, [h]));
+      a.fastupdate && ((d = a.reg.get(e)) ? d.push(h) : a.reg.set(e, [h]));
     }
   }
 }
@@ -1519,12 +1519,12 @@ function cb(a) {
   if (c.length) {
     return Promise.all(c).then(function() {
       a.result.length && (d = [a.result].concat(d));
-      a.result = db(d, e, g, f, h, a.M);
+      a.result = db(d, e, g, f, h, a.K);
       return h ? a.result : a;
     });
   }
   this.result.length && (d = [this.result].concat(d));
-  this.result = db(d, e, g, f, h, a.M);
+  this.result = db(d, e, g, f, h, a.K);
   return h ? this.result : this;
 };
 function db(a, b, c, d, e, g) {
@@ -1605,12 +1605,12 @@ function db(a, b, c, d, e, g) {
     if (c.length) {
       return Promise.all(c).then(function() {
         d = [a.result].concat(d);
-        a.result = eb(d, e, g, f, a.M);
+        a.result = eb(d, e, g, f, a.K);
         return f ? a.result : a;
       });
     }
     d = [this.result].concat(d);
-    this.result = eb(d, e, g, f, a.M);
+    this.result = eb(d, e, g, f, a.K);
     return f ? this.result : this;
   }
   return this;
@@ -1697,12 +1697,12 @@ function eb(a, b, c, d, e) {
   if (c.length) {
     return Promise.all(c).then(function() {
       a.result.length && (d = [a.result].concat(d));
-      a.result = fb(d, e, g, f, !h, a.M);
+      a.result = fb(d, e, g, f, !h, a.K);
       return h ? a.result : a;
     });
   }
   this.result.length && (d = [this.result].concat(d));
-  this.result = fb(d, e, g, f, !h, a.M);
+  this.result = fb(d, e, g, f, !h, a.K);
   return h ? this.result : this;
 };
 function fb(a, b, c, d, e, g) {
@@ -1818,7 +1818,7 @@ function gb(a, b) {
   }
   this.index = null;
   this.result = a || [];
-  this.M = 0;
+  this.K = 0;
 }
 X.prototype.limit = function(a) {
   if (this.result.length) {
@@ -1844,7 +1844,7 @@ X.prototype.offset = function(a) {
   return this;
 };
 X.prototype.boost = function(a) {
-  this.M += a;
+  this.K += a;
   return this;
 };
 X.prototype.resolve = function(a, b, c) {
@@ -1994,12 +1994,12 @@ V.prototype.search = function(a, b, c) {
             D = a[u];
             return t ? F(E, Y(v, D, t), 8) : F(E, Y(v, D), 7);
           case 7:
-            A = E.G;
+            A = E.F;
             A = lb(A, d, h, v.resolution, b, e, 1 === m);
             E.h = 6;
             break;
           case 8:
-            A = E.G, A = lb(A, d, h, v.da, b, e, 2 === m), h && !1 === A && d.length || (t = D);
+            A = E.F, A = lb(A, d, h, v.ba, b, e, 2 === m), h && !1 === A && d.length || (t = D);
           case 6:
             if (A) {
               return E.return(A);
@@ -2031,7 +2031,7 @@ V.prototype.search = function(a, b, c) {
   }
   for (k = f = void 0; u < m; u++) {
     k = a[u];
-    t ? (f = Y(this, k, t), f = lb(f, d, h, this.da, b, e, 2 === m), h && !1 === f && d.length || (t = k)) : (f = Y(this, k), f = lb(f, d, h, this.resolution, b, e, 1 === m));
+    t ? (f = Y(this, k, t), f = lb(f, d, h, this.ba, b, e, 2 === m), h && !1 === f && d.length || (t = k)) : (f = Y(this, k), f = lb(f, d, h, this.resolution, b, e, 1 === m));
     if (f) {
       return f;
     }
@@ -2086,11 +2086,11 @@ function Y(a, b, c, d, e, g, f, h) {
   if (a.db) {
     return c ? a.db.get(k ? c : b, k ? b : c, d, e, g, f, h) : a.db.get(b, "", d, e, g, f, h);
   }
-  a = c ? (a = a.J.get(k ? b : c)) && a.get(k ? c : b) : a.map.get(b);
+  a = c ? (a = a.ctx.get(k ? b : c)) && a.get(k ? c : b) : a.map.get(b);
   return a;
 }
 ;V.prototype.remove = function(a, b) {
-  var c = this.B.size && (this.fastupdate ? this.B.get(a) : this.B.has(a));
+  var c = this.reg.size && (this.fastupdate ? this.reg.get(a) : this.reg.has(a));
   if (c) {
     if (this.fastupdate) {
       for (var d = 0, e; d < c.length; d++) {
@@ -2104,11 +2104,11 @@ function Y(a, b, c, d, e, g, f, h) {
         }
       }
     } else {
-      mb(this.map, a), this.depth && mb(this.J, a);
+      mb(this.map, a), this.depth && mb(this.ctx, a);
     }
-    b || this.B.delete(a);
+    b || this.reg.delete(a);
   }
-  this.db && (this.R.push({del:a}), this.ga && bb(this));
+  this.db && (this.O.push({del:a}), this.ea && bb(this));
   this.cache && this.cache.remove(a);
   return this;
 };
@@ -2154,17 +2154,17 @@ function mb(a, b) {
   this.score = a.score || null;
   (e = a.keystore || 0) && (this.keystore = e);
   this.map = e ? new S(e) : new Map();
-  this.J = e ? new S(e) : new Map();
-  this.B = b || (this.fastupdate ? e ? new S(e) : new Map() : e ? new T(e) : new Set());
-  this.da = c.resolution || 1;
+  this.ctx = e ? new S(e) : new Map();
+  this.reg = b || (this.fastupdate ? e ? new S(e) : new Map() : e ? new T(e) : new Set());
+  this.ba = c.resolution || 1;
   this.rtl = d.rtl || a.rtl || !1;
   this.cache = (e = a.cache || null) && new Q(e);
   this.resolve = !1 !== a.resolve;
   if (e = a.db) {
     this.db = e.mount(this);
   }
-  this.ga = !1 !== a.commit;
-  this.R = [];
+  this.ea = !1 !== a.commit;
+  this.O = [];
   this.h = null;
 }
 w = V.prototype;
@@ -2184,17 +2184,17 @@ function bb(a) {
 }
 w.clear = function() {
   this.map.clear();
-  this.J.clear();
-  this.B.clear();
+  this.ctx.clear();
+  this.reg.clear();
   this.cache && this.cache.clear();
-  this.db && (this.h && clearTimeout(this.h), this.h = null, this.R = [{clear:!0}]);
+  this.db && (this.h && clearTimeout(this.h), this.h = null, this.O = [{clear:!0}]);
   return this;
 };
 w.append = function(a, b) {
   return this.add(a, b, !0);
 };
 w.contain = function(a) {
-  return this.db ? this.db.has(a) : this.B.has(a);
+  return this.db ? this.db.has(a) : this.reg.has(a);
 };
 w.update = function(a, b) {
   if (this.async) {
@@ -2225,7 +2225,7 @@ w.cleanup = function() {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
   nb(this.map);
-  this.depth && nb(this.J);
+  this.depth && nb(this.ctx);
   return this;
 };
 w.searchCache = Ha;
@@ -2239,11 +2239,11 @@ w.export = function(a, b, c, d, e, g) {
       var h = "reg";
       if (this.fastupdate) {
         var k = K();
-        for (var l = x(this.B.keys()), m = l.next(); !m.done; m = l.next()) {
+        for (var l = x(this.reg.keys()), m = l.next(); !m.done; m = l.next()) {
           k[m.value] = 1;
         }
       } else {
-        k = this.B;
+        k = this.reg;
       }
       break;
     case 1:
@@ -2256,7 +2256,7 @@ w.export = function(a, b, c, d, e, g) {
       break;
     case 3:
       h = "ctx";
-      k = this.J;
+      k = this.ctx;
       break;
     default:
       "undefined" === typeof c && g && g();
@@ -2273,16 +2273,68 @@ w.import = function(a, b) {
         break;
       case "reg":
         this.fastupdate = !1;
-        this.B = b;
+        this.reg = b;
         break;
       case "map":
         this.map = b;
         break;
       case "ctx":
-        this.J = b;
+        this.ctx = b;
     }
   }
 };
+w.serialize = function(a) {
+  a = void 0 === a ? !0 : a;
+  if (!this.reg.size) {
+    return "";
+  }
+  for (var b = "", c = "", d = x(this.reg.keys()), e = d.next(); !e.done; e = d.next()) {
+    e = e.value, c || (c = typeof e), b += (b ? "," : "") + ("string" === c ? '"' + e + '"' : e);
+  }
+  b = "index.reg=new Set([" + b + "]);";
+  d = "";
+  e = x(this.map.entries());
+  for (var g = e.next(); !g.done; g = e.next()) {
+    var f = g.value;
+    g = f[0];
+    f = f[1];
+    for (var h = "", k = 0, l; k < f.length; k++) {
+      l = f[k] || [""];
+      for (var m = "", n = 0; n < l.length; n++) {
+        m += (m ? "," : "") + ("string" === c ? '"' + l[n] + '"' : l[n]);
+      }
+      m = "[" + m + "]";
+      h += (h ? "," : "") + m;
+    }
+    h = '["' + g + '",[' + h + "]]";
+    d += (d ? "," : "") + h;
+  }
+  d = "index.map=new Map([" + d + "]);";
+  e = "";
+  g = x(this.ctx.entries());
+  for (f = g.next(); !f.done; f = g.next()) {
+    for (h = f.value, f = h[0], h = x(h[1].entries()), k = h.next(); !k.done; k = h.next()) {
+      l = k.value;
+      k = l[0];
+      l = l[1];
+      m = "";
+      n = 0;
+      for (var p; n < l.length; n++) {
+        p = l[n] || [""];
+        for (var q = "", r = 0; r < p.length; r++) {
+          q += (q ? "," : "") + ("string" === c ? '"' + p[r] + '"' : p[r]);
+        }
+        q = "[" + q + "]";
+        m += (m ? "," : "") + q;
+      }
+      m = 'new Map([["' + k + '",[' + m + "]]])";
+      m = '["' + f + '",' + m + "]";
+      e += (e ? "," : "") + m;
+    }
+  }
+  e = "index.ctx=new Map([" + e + "]);";
+  return a ? "function inject(index){" + b + d + e + "}" : b + d + e;
+};
 Za(V.prototype);
 function ob(a) {
   var b, c, d, e, g, f, h, k;
@@ -2358,25 +2410,25 @@ function rb(a, b, c) {
 ;Z.prototype.add = function(a, b, c) {
   M(a) && (b = a, a = ya(b, this.key));
   if (b && (a || 0 === a)) {
-    if (!c && this.B.has(a)) {
+    if (!c && this.reg.has(a)) {
       return this.update(a, b);
     }
     for (var d = 0, e; d < this.field.length; d++) {
-      e = this.O[d];
+      e = this.M[d];
       var g = this.index.get(this.field[d]);
       if ("function" === typeof e) {
         (e = e(b)) && g.add(a, e, !1, !0);
       } else {
-        var f = e.U;
+        var f = e.S;
         if (!f || f(b)) {
-          e.constructor === String ? e = ["" + e] : L(e) && (e = [e]), tb(b, e, this.W, 0, g, a, e[0], c);
+          e.constructor === String ? e = ["" + e] : L(e) && (e = [e]), tb(b, e, this.U, 0, g, a, e[0], c);
         }
       }
     }
     if (this.tag) {
-      for (d = 0; d < this.N.length; d++) {
-        f = this.N[d];
-        var h = this.ca[d];
+      for (d = 0; d < this.L.length; d++) {
+        f = this.L[d];
+        var h = this.aa[d];
         g = this.tag.get(h);
         e = K();
         if ("function" === typeof f) {
@@ -2384,7 +2436,7 @@ function rb(a, b, c) {
             continue;
           }
         } else {
-          var k = f.U;
+          var k = f.S;
           if (k && !k(b)) {
             continue;
           }
@@ -2402,14 +2454,14 @@ function rb(a, b, c) {
                 if (k.length === Math.pow(2, 31) - 1) {
                   m = new R(k);
                   if (this.fastupdate) {
-                    for (var n = x(this.B.values()), p = n.next(); !p.done; p = n.next()) {
+                    for (var n = x(this.reg.values()), p = n.next(); !p.done; p = n.next()) {
                       p = p.value, p.includes(k) && (p[p.indexOf(k)] = m);
                     }
                   }
                   g.set(l, k = m);
                 }
                 k.push(a);
-                this.fastupdate && ((l = this.B.get(a)) ? l.push(k) : this.B.set(a, [k]));
+                this.fastupdate && ((l = this.reg.get(a)) ? l.push(k) : this.reg.set(a, [k]));
               }
             }
           }
@@ -2419,17 +2471,17 @@ function rb(a, b, c) {
       }
     }
     if (this.store && (!c || !this.store.has(a))) {
-      if (this.I) {
+      if (this.H) {
         var q = K();
-        for (c = 0; c < this.I.length; c++) {
-          if (d = this.I[c], g = d.U, !g || g(b)) {
+        for (c = 0; c < this.H.length; c++) {
+          if (d = this.H[c], g = d.S, !g || g(b)) {
             g = void 0;
             if ("function" === typeof d) {
               g = d(b);
               if (!g) {
                 continue;
               }
-              d = [d.oa];
+              d = [d.ma];
             } else if (L(d) || d.constructor === String) {
               q[d] = b[d];
               continue;
@@ -2564,7 +2616,7 @@ function tb(a, b, c, d, e, g, f, h) {
   r = !d && (this.worker || this.async) && [];
   y = 0;
   for (v = u = t = void 0; y < l.length; y++) {
-    if (u = l[y], !this.db || !this.tag || this.O[y]) {
+    if (u = l[y], !this.db || !this.tag || this.M[y]) {
       t = void 0;
       L(u) || (t = u, u = t.field, a = t.query || a, b = t.limit || b, p = t.suggest || p);
       if (d) {
@@ -2575,7 +2627,7 @@ function tb(a, b, c, d, e, g, f, h) {
         if (m) {
           if (this.db) {
             v.tag = m;
-            var E = t.db.sa;
+            var E = t.db.qa;
             v.field = l;
           }
           E || (v.enrich = !1);
@@ -2721,13 +2773,13 @@ function wb(a) {
     return new Z(a);
   }
   var b = a.document || a.doc || a, c, d;
-  this.O = [];
+  this.M = [];
   this.field = [];
-  this.W = [];
-  this.key = (c = b.key || b.id) && yb(c, this.W) || "id";
+  this.U = [];
+  this.key = (c = b.key || b.id) && yb(c, this.U) || "id";
   (d = a.keystore || 0) && (this.keystore = d);
-  this.B = (this.fastupdate = !!a.fastupdate) ? d ? new S(d) : new Map() : d ? new T(d) : new Set();
-  this.I = (c = b.store || null) && !0 !== c && [];
+  this.reg = (this.fastupdate = !!a.fastupdate) ? d ? new S(d) : new Map() : d ? new T(d) : new Set();
+  this.H = (c = b.store || null) && !0 !== c && [];
   this.store = c && (d ? new S(d) : new Map());
   this.cache = (c = a.cache || null) && new Q(c);
   a.cache = !1;
@@ -2745,27 +2797,27 @@ function wb(a) {
       c.set(g, h);
       h.worker || (this.worker = !1);
     }
-    this.worker || c.set(g, new V(f, this.B));
-    f.custom ? this.O[e] = f.custom : (this.O[e] = yb(g, this.W), f.filter && ("string" === typeof this.O[e] && (this.O[e] = new String(this.O[e])), this.O[e].U = f.filter));
+    this.worker || c.set(g, new V(f, this.reg));
+    f.custom ? this.M[e] = f.custom : (this.M[e] = yb(g, this.U), f.filter && ("string" === typeof this.M[e] && (this.M[e] = new String(this.M[e])), this.M[e].S = f.filter));
     this.field[e] = g;
   }
-  if (this.I) {
+  if (this.H) {
     for (d = b.store, L(d) && (d = [d]), e = 0; e < d.length; e++) {
-      g = d[e], f = g.field || g, g.custom ? (this.I[e] = g.custom, g.custom.oa = f) : (this.I[e] = yb(f, this.W), g.filter && ("string" === typeof this.I[e] && (this.I[e] = new String(this.I[e])), this.I[e].U = g.filter));
+      g = d[e], f = g.field || g, g.custom ? (this.H[e] = g.custom, g.custom.ma = f) : (this.H[e] = yb(f, this.U), g.filter && ("string" === typeof this.H[e] && (this.H[e] = new String(this.H[e])), this.H[e].S = g.filter));
     }
   }
   this.index = c;
   this.tag = null;
   if (c = b.tag) {
     if ("string" === typeof c && (c = [c]), c.length) {
-      for (this.tag = new Map(), this.N = [], this.ca = [], b = 0; b < c.length; b++) {
+      for (this.tag = new Map(), this.L = [], this.aa = [], b = 0; b < c.length; b++) {
         d = c[b];
         e = d.field || d;
         if (!e) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
-        d.custom ? this.N[b] = d.custom : (this.N[b] = yb(e, this.W), d.filter && ("string" === typeof this.N[b] && (this.N[b] = new String(this.N[b])), this.N[b].U = d.filter));
-        this.ca[b] = e;
+        d.custom ? this.L[b] = d.custom : (this.L[b] = yb(e, this.U), d.filter && ("string" === typeof this.L[b] && (this.L[b] = new String(this.L[b])), this.L[b].S = d.filter));
+        this.aa[b] = e;
         this.tag.set(e, new Map());
       }
     }
@@ -2776,10 +2828,10 @@ w = Z.prototype;
 w.mount = function(a) {
   var b = this.field;
   if (this.tag) {
-    for (var c = 0, d; c < this.ca.length; c++) {
-      d = this.ca[c];
+    for (var c = 0, d; c < this.aa.length; c++) {
+      d = this.aa[c];
       var e = this.index.get(d);
-      e || (this.index.set(d, e = new V({}, this.B)), b === this.field && (b = b.slice(0)), b.push(d));
+      e || (this.index.set(d, e = new V({}, this.reg)), b === this.field && (b = b.slice(0)), b.push(d));
       e.tag = this.tag.get(d);
     }
   }
@@ -2793,7 +2845,7 @@ w.mount = function(a) {
     f.id = a.id;
     c[e] = f.mount(g);
     g.document = !0;
-    e ? g.pa = !0 : g.store = this.store;
+    e ? g.na = !0 : g.store = this.store;
   }
   this.db = this.async = !0;
   return Promise.all(c);
@@ -2809,7 +2861,7 @@ w.commit = function(a, b) {
       }
       return F(h, Promise.all(d), 2);
     }
-    c.B.clear();
+    c.reg.clear();
     h.h = 0;
   });
 };
@@ -2831,7 +2883,7 @@ w.remove = function(a) {
   for (var b = x(this.index.values()), c = b.next(); !c.done; c = b.next()) {
     c.value.remove(a, !0);
   }
-  if (this.B.has(a)) {
+  if (this.reg.has(a)) {
     if (this.tag && !this.fastupdate) {
       for (b = x(this.tag.values()), c = b.next(); !c.done; c = b.next()) {
         c = c.value;
@@ -2845,7 +2897,7 @@ w.remove = function(a) {
       }
     }
     this.store && this.store.delete(a);
-    this.B.delete(a);
+    this.reg.delete(a);
   }
   this.cache && this.cache.remove(a);
   return this;
@@ -2863,7 +2915,7 @@ w.clear = function() {
   return this;
 };
 w.contain = function(a) {
-  return this.db ? this.index.get(this.field[0]).db.has(a) : this.B.has(a);
+  return this.db ? this.index.get(this.field[0]).db.has(a) : this.reg.has(a);
 };
 w.cleanup = function() {
   for (var a = x(this.index.values()), b = a.next(); !b.done; b = a.next()) {
@@ -2921,10 +2973,10 @@ w.import = function(a, b) {
         break;
       case "reg":
         this.fastupdate = !1;
-        this.B = b;
+        this.reg = b;
         a = 0;
         for (var c; a < this.field.length; a++) {
-          c = this.index[this.field[a]], c.B = b, c.fastupdate = !1;
+          c = this.index[this.field[a]], c.reg = b, c.fastupdate = !1;
         }
         break;
       case "store":
@@ -2946,7 +2998,7 @@ function Bb(a, b) {
   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.sa = !1;
+  this.qa = !1;
   this.db = null;
   this.h = {};
 }
@@ -3096,8 +3148,8 @@ w.commit = function(a, b, c) {
         if (b) {
           return F(h, d.clear(), 12);
         }
-        e = a.R;
-        a.R = [];
+        e = a.O;
+        a.O = [];
         g = 0;
         f = void 0;
       case 4:
@@ -3107,7 +3159,7 @@ w.commit = function(a, b, c) {
         }
         f = e[g];
         if (!f.clear) {
-          e[g] = f.ta;
+          e[g] = f.ra;
           h.h = 5;
           break;
         }
@@ -3125,7 +3177,7 @@ w.commit = function(a, b, c) {
           h.h = 3;
           break;
         }
-        c || (e = e.concat(xa(a.B)));
+        c || (e = e.concat(xa(a.reg)));
         if (!e.length) {
           h.h = 10;
           break;
@@ -3136,16 +3188,16 @@ w.commit = function(a, b, c) {
         h.h = 3;
         break;
       case 12:
-        a.R = [];
+        a.O = [];
       case 3:
-        return a.B.size ? F(h, d.transaction("map", "readwrite", function(k) {
-          for (var l = x(a.map), m = l.next(), n = {}; !m.done; n = {S:void 0, aa:void 0}, m = l.next()) {
-            m = m.value, n.aa = m[0], n.S = m[1], n.S.length && (b ? k.put(n.S, n.aa) : k.get(n.aa).onsuccess = function(p) {
+        return a.reg.size ? F(h, d.transaction("map", "readwrite", function(k) {
+          for (var l = x(a.map), m = l.next(), n = {}; !m.done; n = {P:void 0, Z:void 0}, m = l.next()) {
+            m = m.value, n.Z = m[0], n.P = m[1], n.P.length && (b ? k.put(n.P, n.Z) : k.get(n.Z).onsuccess = function(p) {
               return function() {
                 var q = this.result, r;
                 if (q && q.length) {
-                  for (var y = Math.max(q.length, p.S.length), u = 0, t; u < y; u++) {
-                    if ((t = p.S[u]) && t.length) {
+                  for (var y = Math.max(q.length, p.P.length), u = 0, t; u < y; u++) {
+                    if ((t = p.P[u]) && t.length) {
                       if ((r = q[u]) && r.length) {
                         for (var v = 0; v < t.length; v++) {
                           r.push(t[v]);
@@ -3157,26 +3209,26 @@ w.commit = function(a, b, c) {
                     }
                   }
                 } else {
-                  q = p.S, r = 1;
+                  q = p.P, r = 1;
                 }
-                r && k.put(q, p.aa);
+                r && k.put(q, p.Z);
               };
             }(n));
           }
         }), 13) : h.return();
       case 13:
         return F(h, d.transaction("ctx", "readwrite", function(k) {
-          for (var l = x(a.J), m = l.next(), n = {}; !m.done; n = {Z:void 0}, m = l.next()) {
+          for (var l = x(a.ctx), m = l.next(), n = {}; !m.done; n = {X:void 0}, m = l.next()) {
             m = m.value;
-            n.Z = m[0];
+            n.X = m[0];
             m = x(m[1]);
-            for (var p = m.next(), q = {}; !p.done; q = {T:void 0, ba:void 0}, p = m.next()) {
-              p = p.value, q.ba = p[0], q.T = p[1], q.T.length && (b ? k.put(q.T, n.Z + ":" + q.ba) : k.get(n.Z + ":" + q.ba).onsuccess = function(r, y) {
+            for (var p = m.next(), q = {}; !p.done; q = {R:void 0, $:void 0}, p = m.next()) {
+              p = p.value, q.$ = p[0], q.R = p[1], q.R.length && (b ? k.put(q.R, n.X + ":" + q.$) : k.get(n.X + ":" + q.$).onsuccess = function(r, y) {
                 return function() {
                   var u = this.result, t;
                   if (u && u.length) {
-                    for (var v = Math.max(u.length, r.T.length), A = 0, D; A < v; A++) {
-                      if ((D = r.T[A]) && D.length) {
+                    for (var v = Math.max(u.length, r.R.length), A = 0, D; A < v; A++) {
+                      if ((D = r.R[A]) && D.length) {
                         if ((t = u[A]) && t.length) {
                           for (var C = 0; C < D.length; C++) {
                             t.push(D[C]);
@@ -3188,9 +3240,9 @@ w.commit = function(a, b, c) {
                       }
                     }
                   } else {
-                    u = r.T, t = 1;
+                    u = r.R, t = 1;
                   }
-                  t && k.put(u, y.Z + ":" + r.ba);
+                  t && k.put(u, y.X + ":" + r.$);
                 };
               }(q, n));
             }
@@ -3207,12 +3259,12 @@ w.commit = function(a, b, c) {
             }
           }), 16);
         }
-        if (a.pa) {
+        if (a.na) {
           h.h = 16;
           break;
         }
         return F(h, d.transaction("reg", "readwrite", function(k) {
-          for (var l = x(a.B.keys()), m = l.next(); !m.done; m = l.next()) {
+          for (var l = x(a.reg.keys()), m = l.next(); !m.done; m = l.next()) {
             k.put(1, m.value);
           }
         }), 16);
@@ -3222,18 +3274,18 @@ w.commit = function(a, b, c) {
           break;
         }
         return F(h, d.transaction("tag", "readwrite", function(k) {
-          for (var l = x(a.tag), m = l.next(), n = {}; !m.done; n = {$:void 0, ea:void 0}, m = l.next()) {
-            m = m.value, n.ea = m[0], n.$ = m[1], n.$.length && (k.get(n.ea).onsuccess = function(p) {
+          for (var l = x(a.tag), m = l.next(), n = {}; !m.done; n = {Y:void 0, ca:void 0}, m = l.next()) {
+            m = m.value, n.ca = m[0], n.Y = m[1], n.Y.length && (k.get(n.ca).onsuccess = function(p) {
               return function() {
                 var q = this.result;
-                q = q && q.length ? q.concat(p.$) : p.$;
-                k.put(q, p.ea);
+                q = q && q.length ? q.concat(p.Y) : p.Y;
+                k.put(q, p.ca);
               };
             }(n));
           }
         }), 20);
       case 20:
-        a.map.clear(), a.J.clear(), a.tag && a.tag.clear(), a.store && a.store.clear(), a.document || a.B.clear(), h.h = 0;
+        a.map.clear(), a.ctx.clear(), a.tag && a.tag.clear(), a.store && a.store.clear(), a.document || a.reg.clear(), h.h = 0;
     }
   });
 };
diff --git a/dist/flexsearch.es5.min.js b/dist/flexsearch.es5.min.js
index 6c58eae..4a658e3 100644
--- a/dist/flexsearch.es5.min.js
+++ b/dist/flexsearch.es5.min.js
@@ -7,115 +7,118 @@
  */
 (function(self){'use strict';var w;function aa(a){var b=0;return function(){return b<a.length?{done:!1,value:a[b++]}:{done:!0}}}function x(a){var b="undefined"!=typeof Symbol&&Symbol.iterator&&a[Symbol.iterator];if(b)return b.call(a);if("number"==typeof a.length)return{next:aa(a)};throw Error(String(a)+" is not an iterable or ArrayLike");}var ba="function"==typeof Object.defineProperties?Object.defineProperty:function(a,b,c){if(a==Array.prototype||a==Object.prototype)return a;a[b]=c.value;return a};
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-l.next(),n={};!m.done;n={$:void 0,ea:void 0},m=l.next())m=m.value,n.ea=m[0],n.$=m[1],n.$.length&&(k.get(n.ea).onsuccess=function(p){return function(){var q=this.result;q=q&&q.length?q.concat(p.$):p.$;k.put(q,p.ea)}}(n))}),20);case 20:a.map.clear(),a.J.clear(),a.tag&&a.tag.clear(),a.store&&a.store.clear(),a.document||a.B.clear(),h.h=0}})};
-function Eb(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()}
+w.get=function(a,b,c,d,e,h){c=void 0===c?0:c;d=void 0===d?0:d;e=void 0===e?!0:e;h=void 0===h?!1:h;a=this.db.transaction(b?"ctx":"map","readonly").objectStore(b?"ctx":"map").get(b?b+":"+a:a);var f=this;return Db(a).then(function(g){var k=[];if(!g||!g.length)return k;if(e){if(!c&&!d&&1===g.length)return g[0];for(var l=0,m=void 0;l<g.length;l++)if((m=g[l])&&m.length)if(d>=m.length)d-=m.length;else{for(var n=c?d+Math.min(m.length-d,c):m.length,p=d;p<n;p++)k.push(m[p]);d=0;if(k.length===c)break}return h?
+f.enrich(k):k}return g})};w.tag=function(a,b,c,d){b=void 0===b?0:b;c=void 0===c?0:c;d=void 0===d?!1:d;a=this.db.transaction("tag","readonly").objectStore("tag").get(a);var e=this;return Db(a).then(function(h){if(!h||!h.length||c>=h.length)return[];if(!b&&!c)return h;h=h.slice(c,c+b);return d?e.enrich(h):h})};
+w.enrich=function(a){"object"!==typeof a&&(a=[a]);for(var b=this.db.transaction("reg","readonly").objectStore("reg"),c=[],d=0;d<a.length;d++)c[d]=Db(b.get(a[d]));return Promise.all(c).then(function(e){for(var h=0;h<e.length;h++)e[h]={id:a[h],doc:e[h]?JSON.parse(e[h]):null};return e})};w.has=function(a){a=this.db.transaction("reg","readonly").objectStore("reg").getKey(a);return Db(a)};w.search=null;w.info=function(){};
+w.transaction=function(a,b,c){var d=this,e=this.h[a+":"+b];if(e)return c.call(this,e);var h=this.db.transaction(a,b);this.h[a+":"+b]=e=h.objectStore(a);return new Promise(function(f,g){h.onerror=function(k){d.h[a+":"+b]=null;h.abort();h=e=null;g(k)};h.oncomplete=function(k){h=e=d.h[a+":"+b]=null;f(k||!0)};return c.call(d,e)})};
+w.commit=function(a,b,c){var d=this,e,h,f;return sa(function(g){switch(g.h){case 1:if(b)return F(g,d.clear(),12);e=a.O;a.O=[];h=0;f=void 0;case 4:if(!(h<e.length)){g.h=6;break}f=e[h];if(!f.clear){e[h]=f.ra;g.h=5;break}return F(g,d.clear(),8);case 8:b=!0;g.h=6;break;case 5:h++;g.h=4;break;case 6:if(b){g.h=3;break}c||(e=e.concat(xa(a.reg)));if(!e.length){g.h=10;break}return F(g,d.remove(e),11);case 11:case 10:g.h=3;break;case 12:a.O=[];case 3:return a.reg.size?F(g,d.transaction("map","readwrite",function(k){for(var l=
+x(a.map),m=l.next(),n={};!m.done;n={P:void 0,Z:void 0},m=l.next())m=m.value,n.Z=m[0],n.P=m[1],n.P.length&&(b?k.put(n.P,n.Z):k.get(n.Z).onsuccess=function(p){return function(){var q=this.result,r;if(q&&q.length)for(var y=Math.max(q.length,p.P.length),u=0,t;u<y;u++){if((t=p.P[u])&&t.length){if((r=q[u])&&r.length)for(var v=0;v<t.length;v++)r.push(t[v]);else q[u]=t;r=1}}else q=p.P,r=1;r&&k.put(q,p.Z)}}(n))}),13):g.return();case 13:return F(g,d.transaction("ctx","readwrite",function(k){for(var l=x(a.ctx),
+m=l.next(),n={};!m.done;n={X:void 0},m=l.next()){m=m.value;n.X=m[0];m=x(m[1]);for(var p=m.next(),q={};!p.done;q={R:void 0,$:void 0},p=m.next())p=p.value,q.$=p[0],q.R=p[1],q.R.length&&(b?k.put(q.R,n.X+":"+q.$):k.get(n.X+":"+q.$).onsuccess=function(r,y){return function(){var u=this.result,t;if(u&&u.length)for(var v=Math.max(u.length,r.R.length),A=0,C;A<v;A++){if((C=r.R[A])&&C.length){if((t=u[A])&&t.length)for(var D=0;D<C.length;D++)t.push(C[D]);else u[A]=C;t=1}}else u=r.R,t=1;t&&k.put(u,y.X+":"+r.$)}}(q,
+n))}}),14);case 14:if(a.store)return F(g,d.transaction("reg","readwrite",function(k){for(var l=x(a.store),m=l.next();!m.done;m=l.next()){var n=m.value;m=n[0];n=n[1];k.put("object"===typeof n?JSON.stringify(n):1,m)}}),16);if(a.na){g.h=16;break}return F(g,d.transaction("reg","readwrite",function(k){for(var l=x(a.reg.keys()),m=l.next();!m.done;m=l.next())k.put(1,m.value)}),16);case 16:if(!a.tag){g.h=20;break}return F(g,d.transaction("tag","readwrite",function(k){for(var l=x(a.tag),m=l.next(),n={};!m.done;n=
+{Y:void 0,ca:void 0},m=l.next())m=m.value,n.ca=m[0],n.Y=m[1],n.Y.length&&(k.get(n.ca).onsuccess=function(p){return function(){var q=this.result;q=q&&q.length?q.concat(p.Y):p.Y;k.put(q,p.ca)}}(n))}),20);case 20:a.map.clear(),a.ctx.clear(),a.tag&&a.tag.clear(),a.store&&a.store.clear(),a.document||a.reg.clear(),g.h=0}})};
+function Eb(a,b,c){for(var d=a.value,e,h,f=0,g=0,k;g<d.length;g++){if(k=c?d:d[g]){for(var l=0,m,n;l<b.length;l++)if(n=b[l],m=k.indexOf(h?parseInt(n,10):n),0>m&&!h&&"string"===typeof n&&!isNaN(n)&&(m=k.indexOf(parseInt(n,10)))&&(h=1),0<=m)if(e=1,1<k.length)k.splice(m,1);else{d[g]=[];break}f+=k.length}if(c)break}f?e&&a.update(d):a.delete();a.continue()}
 w.remove=function(a){"object"!==typeof a&&(a=[a]);return Promise.all([this.transaction("map","readwrite",function(b){b.openCursor().onsuccess=function(){var c=this.result;c&&Eb(c,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){var c=this.result;c&&Eb(c,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){var c=this.result;c&&Eb(c,a,!0)}}),this.transaction("reg","readwrite",function(b){for(var c=0;c<a.length;c++)b.delete(a[c])})])};
 function Db(a){return new Promise(function(b,c){a.onsuccess=function(){b(this.result)};a.oncomplete=function(){b(this.result)};a.onerror=c;a=null})};var Fb={Index:V,Charset:Qa,Encoder:N,Document:Z,Worker:qb,Resolver:X,IndexedDB:Bb,Language:{}},Ib=self,Jb;(Jb=Ib.define)&&Jb.amd?Jb([],function(){return Fb}):"object"===typeof Ib.exports?Ib.exports=Fb:Ib.FlexSearch=Fb;}(this));
diff --git a/dist/flexsearch.light.debug.js b/dist/flexsearch.light.debug.js
index 57eb76d..5300ac6 100644
--- a/dist/flexsearch.light.debug.js
+++ b/dist/flexsearch.light.debug.js
@@ -89,32 +89,32 @@ C.prototype.assign = function(a) {
   this.minlength = t(a.minlength, 1, this.minlength);
   this.maxlength = t(a.maxlength, 0, this.maxlength);
   if (this.cache = b = t(a.cache, !0, this.cache)) {
-    this.m = null, this.B = "number" === typeof b ? b : 2e5, this.i = new Map(), this.j = new Map(), this.o = this.h = 128;
+    this.j = null, this.v = "number" === typeof b ? b : 2e5, this.h = new Map(), this.i = new Map(), this.l = this.g = 128;
   }
-  this.s = "";
-  this.v = null;
-  this.u = "";
-  this.A = null;
+  this.m = "";
+  this.s = null;
+  this.o = "";
+  this.u = null;
   if (this.matcher) {
     for (const d of this.matcher.keys()) {
-      this.s += (this.s ? "|" : "") + d;
+      this.m += (this.m ? "|" : "") + d;
     }
   }
   if (this.stemmer) {
     for (const d of this.stemmer.keys()) {
-      this.u += (this.u ? "|" : "") + d;
+      this.o += (this.o ? "|" : "") + d;
     }
   }
   return this;
 };
 C.prototype.encode = function(a) {
-  if (this.cache && a.length <= this.h) {
-    if (this.m) {
-      if (this.i.has(a)) {
-        return this.i.get(a);
+  if (this.cache && a.length <= this.g) {
+    if (this.j) {
+      if (this.h.has(a)) {
+        return this.h.get(a);
       }
     } else {
-      this.m = setTimeout(D, 0, this);
+      this.j = setTimeout(D, 0, this);
     }
   }
   this.normalize && (a = "function" === typeof this.normalize ? this.normalize(a) : B ? a.normalize("NFKD").replace(B, "").toLowerCase() : a.toLowerCase());
@@ -136,20 +136,20 @@ C.prototype.encode = function(a) {
     if (this.filter && this.filter.has(f)) {
       continue;
     }
-    if (this.cache && f.length <= this.o) {
-      if (this.m) {
-        var e = this.j.get(f);
+    if (this.cache && f.length <= this.l) {
+      if (this.j) {
+        var e = this.i.get(f);
         if (e || "" === e) {
           e && b.push(e);
           continue;
         }
       } else {
-        this.m = setTimeout(D, 0, this);
+        this.j = setTimeout(D, 0, this);
       }
     }
     let k;
-    this.stemmer && 2 < f.length && (this.A || (this.A = new RegExp("(?!^)(" + this.u + ")$")), f = f.replace(this.A, m => this.stemmer.get(m)), k = 1);
-    this.matcher && 1 < f.length && (this.v || (this.v = new RegExp("(" + this.s + ")", "g")), f = f.replace(this.v, m => this.matcher.get(m)), k = 1);
+    this.stemmer && 2 < f.length && (this.u || (this.u = new RegExp("(?!^)(" + this.o + ")$")), f = f.replace(this.u, m => this.stemmer.get(m)), k = 1);
+    this.matcher && 1 < f.length && (this.s || (this.s = new RegExp("(" + this.m + ")", "g")), f = f.replace(this.s, m => this.matcher.get(m)), k = 1);
     f && k && (f.length < this.minlength || this.filter && this.filter.has(f)) && (f = "");
     if (f && (this.mapper || this.dedupe && 1 < f.length)) {
       e = "";
@@ -163,30 +163,30 @@ C.prototype.encode = function(a) {
         f = f.replace(this.replacer[e], this.replacer[e + 1]);
       }
     }
-    this.cache && h.length <= this.o && (this.j.set(h, f), this.j.size > this.B && (this.j.clear(), this.o = this.o / 1.1 | 0));
+    this.cache && h.length <= this.l && (this.i.set(h, f), this.i.size > this.v && (this.i.clear(), this.l = this.l / 1.1 | 0));
     f && b.push(f);
   }
   this.finalize && (b = this.finalize(b) || b);
-  this.cache && a.length <= this.h && (this.i.set(a, b), this.i.size > this.B && (this.i.clear(), this.h = this.h / 1.1 | 0));
+  this.cache && a.length <= this.g && (this.h.set(a, b), this.h.size > this.v && (this.h.clear(), this.g = this.g / 1.1 | 0));
   return b;
 };
 function D(a) {
-  a.m = null;
+  a.j = null;
+  a.h.clear();
   a.i.clear();
-  a.j.clear();
 }
 ;function E(a) {
   this.limit = a && !0 !== a ? a : 1000;
   this.cache = new Map();
-  this.h = "";
+  this.g = "";
 }
 E.prototype.set = function(a, c) {
-  this.cache.set(this.h = a, c);
+  this.cache.set(this.g = a, c);
   this.cache.size > this.limit && this.cache.delete(this.cache.keys().next().value);
 };
 E.prototype.get = function(a) {
   const c = this.cache.get(a);
-  c && this.h !== a && (this.cache.delete(a), this.cache.set(this.h = a, c));
+  c && this.g !== a && (this.cache.delete(a), this.cache.set(this.g = a, c));
   return c;
 };
 E.prototype.remove = function(a) {
@@ -197,7 +197,7 @@ E.prototype.remove = function(a) {
 };
 E.prototype.clear = function() {
   this.cache.clear();
-  this.h = "";
+  this.g = "";
 };
 const F = {normalize:function(a) {
   return a.toLowerCase();
@@ -206,7 +206,7 @@ const G = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, cont
 u();
 H.prototype.add = function(a, c, b, d) {
   if (c && (a || 0 === a)) {
-    if (!d && !b && this.g.has(a)) {
+    if (!d && !b && this.reg.has(a)) {
       return this.update(a, c);
     }
     c = this.encoder.encode(c);
@@ -245,7 +245,7 @@ H.prototype.add = function(a, c, b, d) {
               }
             default:
               if (J(this, l, q, g, a, b), p && 1 < d && n < d - 1) {
-                for (e = u(), f = this.C, g = q, h = Math.min(p + 1, d - n), e[g] = 1, k = 1; k < h; k++) {
+                for (e = u(), f = this.A, g = q, h = Math.min(p + 1, d - n), e[g] = 1, k = 1; k < h; k++) {
                   if ((q = c[this.rtl ? d - 1 - n - k : n + k]) && !e[q]) {
                     e[q] = 1;
                     const A = this.score ? this.score(c, g, n, q, k) : I(f + (d / 2 > f ? 0 : 1), d, n, h - 1, k - 1), M = this.bidirectional && q > g;
@@ -256,14 +256,14 @@ H.prototype.add = function(a, c, b, d) {
           }
         }
       }
-      this.fastupdate || this.g.add(a);
+      this.fastupdate || this.reg.add(a);
     }
   }
   return this;
 };
 function J(a, c, b, d, e, g, f) {
-  let h = f ? a.l : a.map, k;
-  c[b] && f && (k = c[b])[f] || (f ? (c = k || (c[b] = u()), c[f] = 1, (k = h.get(f)) ? h = k : h.set(f, h = new Map())) : c[b] = 1, (k = h.get(b)) ? h = k : h.set(b, h = []), h = h[d] || (h[d] = []), g && h.includes(e) || (h.push(e), a.fastupdate && ((c = a.g.get(e)) ? c.push(h) : a.g.set(e, [h]))));
+  let h = f ? a.ctx : a.map, k;
+  c[b] && f && (k = c[b])[f] || (f ? (c = k || (c[b] = u()), c[f] = 1, (k = h.get(f)) ? h = k : h.set(f, h = new Map())) : c[b] = 1, (k = h.get(b)) ? h = k : h.set(b, h = []), h = h[d] || (h[d] = []), g && h.includes(e) || (h.push(e), a.fastupdate && ((c = a.reg.get(e)) ? c.push(h) : a.reg.set(e, [h]))));
 }
 function I(a, c, b, d, e) {
   return b && 1 < a ? c + (d || 0) <= a ? b + (e || 0) : (a - 1) / (c + (d || 0)) * (b + (e || 0)) + 1 | 0 : 0;
@@ -357,7 +357,7 @@ function I(a, c, b, d, e) {
   }
   for (let p, r; m < b; m++) {
     r = a[m];
-    l ? (p = N(this, r, l), p = O(p, d, f, this.C, c, e, 2 === b), f && !1 === p && d.length || (l = r)) : (p = N(this, r), p = O(p, d, f, this.resolution, c, e, 1 === b));
+    l ? (p = N(this, r, l), p = O(p, d, f, this.A, c, e, 2 === b), f && !1 === p && d.length || (l = r)) : (p = N(this, r), p = O(p, d, f, this.resolution, c, e, 1 === b));
     if (p) {
       return p;
     }
@@ -458,11 +458,11 @@ function O(a, c, b, d, e, g, f) {
 function N(a, c, b) {
   let d;
   b && (d = a.bidirectional && c > b);
-  a = b ? (a = a.l.get(d ? c : b)) && a.get(d ? b : c) : a.map.get(c);
+  a = b ? (a = a.ctx.get(d ? c : b)) && a.get(d ? b : c) : a.map.get(c);
   return a;
 }
 ;H.prototype.remove = function(a, c) {
-  const b = this.g.size && (this.fastupdate ? this.g.get(a) : this.g.has(a));
+  const b = this.reg.size && (this.fastupdate ? this.reg.get(a) : this.reg.has(a));
   if (b) {
     if (this.fastupdate) {
       for (let d = 0, e; d < b.length; d++) {
@@ -476,9 +476,9 @@ function N(a, c, b) {
         }
       }
     } else {
-      P(this.map, a), this.depth && P(this.l, a);
+      P(this.map, a), this.depth && P(this.ctx, a);
     }
-    c || this.g.delete(a);
+    c || this.reg.delete(a);
   }
   this.cache && this.cache.remove(a);
   return this;
@@ -526,16 +526,16 @@ function P(a, c) {
   this.score = a.score || null;
   e = !1;
   this.map = new Map();
-  this.l = new Map();
-  this.g = c || (this.fastupdate ? new Map() : new Set());
-  this.C = b.resolution || 1;
+  this.ctx = new Map();
+  this.reg = c || (this.fastupdate ? new Map() : new Set());
+  this.A = b.resolution || 1;
   this.rtl = d.rtl || a.rtl || !1;
   this.cache = (e = a.cache || null) && new E(e);
 }
 H.prototype.clear = function() {
   this.map.clear();
-  this.l.clear();
-  this.g.clear();
+  this.ctx.clear();
+  this.reg.clear();
   this.cache && this.cache.clear();
   return this;
 };
@@ -543,7 +543,7 @@ H.prototype.append = function(a, c) {
   return this.add(a, c, !0);
 };
 H.prototype.contain = function(a) {
-  return this.g.has(a);
+  return this.reg.has(a);
 };
 H.prototype.update = function(a, c) {
   if (this.async) {
@@ -571,7 +571,7 @@ H.prototype.cleanup = function() {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
   Q(this.map);
-  this.depth && Q(this.l);
+  this.depth && Q(this.ctx);
   return this;
 };
 H.prototype.searchCache = function(a, c, b) {
diff --git a/dist/flexsearch.light.min.js b/dist/flexsearch.light.min.js
index 0da94ac..dffb152 100644
--- a/dist/flexsearch.light.min.js
+++ b/dist/flexsearch.light.min.js
@@ -8,18 +8,18 @@
 (function(self){'use strict';function t(a,c,b){const d=typeof b,e=typeof a;if("undefined"!==d){if("undefined"!==e){if(b){if("function"===e&&d===e)return function(h){return a(b(h))};c=a.constructor;if(c===b.constructor){if(c===Array)return b.concat(a);if(c===Map){var g=new Map(b);for(var f of a)g.set(f[0],f[1]);return g}if(c===Set){f=new Set(b);for(g of a.values())f.add(g);return f}}}return a}return b}return"undefined"===e?c:a}function u(){return Object.create(null)}function v(a,c){return c.length-a.length};const w=/[^\p{L}\p{N}]+/u,x=/(\d{3})/g,y=/(\D)(\d{3})/g,z=/(\d{3})(\D)/g,B="".normalize&&/[\u0300-\u036f]/g;function C(a){if(!this)return new C(...arguments);for(let c=0;c<arguments.length;c++)this.assign(arguments[c])}
 C.prototype.assign=function(a){this.normalize=t(a.normalize,!0,this.normalize);let c=a.include,b=c||a.exclude||a.split;if("object"===typeof b){let d=!c,e="";a.include||(e+="\\p{Z}");b.letter&&(e+="\\p{L}");b.number&&(e+="\\p{N}",d=!!c);b.symbol&&(e+="\\p{S}");b.punctuation&&(e+="\\p{P}");b.control&&(e+="\\p{C}");if(b=b.char)e+="object"===typeof b?b.join(""):b;this.split=new RegExp("["+(c?"^":"")+e+"]+","u");this.numeric=d}else this.split=t(b,w,this.split),this.numeric=t(this.numeric,!0);this.prepare=
 t(a.prepare,null,this.prepare);this.finalize=t(a.finalize,null,this.finalize);this.rtl=a.rtl||!1;this.dedupe=t(a.dedupe,!0,this.dedupe);this.filter=t((b=a.filter)&&new Set(b),null,this.filter);this.matcher=t((b=a.matcher)&&new Map(b),null,this.matcher);this.mapper=t((b=a.mapper)&&new Map(b),null,this.mapper);this.stemmer=t((b=a.stemmer)&&new Map(b),null,this.stemmer);this.replacer=t(a.replacer,null,this.replacer);this.minlength=t(a.minlength,1,this.minlength);this.maxlength=t(a.maxlength,0,this.maxlength);
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+function M(a,c,b,d){return(a=N(this,a,c))&&a.length?K(a,b,d):[]}function O(a,c,b,d,e,g,f){let h=[];if(a){d=Math.min(a.length,d);for(let k=0,m=0,l;k<d;k++)if(l=a[k])if(g&&l&&f&&(l.length<=g?(g-=l.length,l=null):(l=l.slice(g),g=0)),l&&(h[k]=l,f&&(m+=l.length,m>=e)))break;if(h.length){if(f)return K(h,e,0);c.push(h);return}}return!b&&h}function N(a,c,b){let d;b&&(d=a.bidirectional&&c>b);a=b?(a=a.ctx.get(d?c:b))&&a.get(d?b:c):a.map.get(c);return a};H.prototype.remove=function(a,c){const b=this.reg.size&&(this.fastupdate?this.reg.get(a):this.reg.has(a));if(b){if(this.fastupdate)for(let d=0,e;d<b.length;d++){if(e=b[d])if(2>e.length)e.pop();else{const g=e.indexOf(a);g===b.length-1?e.pop():e.splice(g,1)}}else P(this.map,a),this.depth&&P(this.ctx,a);c||this.reg.delete(a)}this.cache&&this.cache.remove(a);return this};
+function P(a,c){let b=0;if(a.constructor===Array)for(let d=0,e,g;d<a.length;d++){if((e=a[d])&&e.length)if(g=e.indexOf(c),0<=g){1<e.length?(e.splice(g,1),b++):delete a[d];break}else b++}else for(let d of a){const e=d[0],g=P(d[1],c);g?b+=g:a.delete(e)}return b};function H(a,c){if(!this)return new H(a);if(a){var b="string"===typeof a?a:a.preset;b&&(a=Object.assign({},G[b],a))}else a={};b=a.context||{};const d=a.encode||a.encoder||F;this.encoder=d.encode?d:"object"===typeof d?new C(d):{encode:d};let e;this.resolution=a.resolution||9;this.tokenize=e=a.tokenize||"strict";this.depth="strict"===e&&b.depth||0;this.bidirectional=!1!==b.bidirectional;this.fastupdate=!!a.fastupdate;this.score=a.score||null;e=!1;this.map=new Map;this.ctx=new Map;this.reg=c||(this.fastupdate?
+new Map:new Set);this.A=b.resolution||1;this.rtl=d.rtl||a.rtl||!1;this.cache=(e=a.cache||null)&&new E(e)}H.prototype.clear=function(){this.map.clear();this.ctx.clear();this.reg.clear();this.cache&&this.cache.clear();return this};H.prototype.append=function(a,c){return this.add(a,c,!0)};H.prototype.contain=function(a){return this.reg.has(a)};H.prototype.update=function(a,c){if(this.async){const b=this,d=this.remove(a);return d.then?d.then(()=>b.add(a,c)):this.add(a,c)}return this.remove(a).add(a,c)};
+function Q(a){let c=0;if(a.constructor===Array)for(let b=0,d;b<a.length;b++)(d=a[b])&&(c+=d.length);else for(const b of a){const d=b[0],e=Q(b[1]);e?c+=e:a.delete(d)}return c}H.prototype.cleanup=function(){if(!this.fastupdate)return this;Q(this.map);this.depth&&Q(this.ctx);return this};
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diff --git a/dist/flexsearch.light.module.debug.js b/dist/flexsearch.light.module.debug.js
index d0aa06b..1948f6d 100644
--- a/dist/flexsearch.light.module.debug.js
+++ b/dist/flexsearch.light.module.debug.js
@@ -14,15 +14,15 @@ function u(a, c) {
 ;function v(a) {
   this.limit = a && !0 !== a ? a : 1000;
   this.cache = new Map();
-  this.B = "";
+  this.h = "";
 }
 v.prototype.set = function(a, c) {
-  this.cache.set(this.B = a, c);
+  this.cache.set(this.h = a, c);
   this.cache.size > this.limit && this.cache.delete(this.cache.keys().next().value);
 };
 v.prototype.get = function(a) {
   const c = this.cache.get(a);
-  c && this.B !== a && (this.cache.delete(a), this.cache.set(this.B = a, c));
+  c && this.h !== a && (this.cache.delete(a), this.cache.set(this.h = a, c));
   return c;
 };
 v.prototype.remove = function(a) {
@@ -33,7 +33,7 @@ v.prototype.remove = function(a) {
 };
 v.prototype.clear = function() {
   this.cache.clear();
-  this.B = "";
+  this.h = "";
 };
 const w = new Map([["b", "p"], ["v", "f"], ["w", "f"], ["z", "s"], ["x", "s"], ["d", "t"], ["n", "m"], ["c", "k"], ["g", "k"], ["j", "k"], ["q", "k"], ["i", "e"], ["y", "e"], ["u", "o"]]);
 const x = new Map([["ai", "ei"], ["ae", "a"], ["oe", "o"], ["ue", "u"], ["sh", "s"], ["ch", "c"], ["th", "t"], ["ph", "f"], ["pf", "f"]]), z = [/([^aeo])h([aeo$])/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2"];
@@ -67,7 +67,7 @@ function G(a) {
 ;t();
 H.prototype.add = function(a, c, b, d) {
   if (c && (a || 0 === a)) {
-    if (!d && !b && this.h.has(a)) {
+    if (!d && !b && this.reg.has(a)) {
       return this.update(a, c);
     }
     c = this.encoder.encode(c);
@@ -106,7 +106,7 @@ H.prototype.add = function(a, c, b, d) {
               }
             default:
               if (K(this, m, n, f, a, b), q && 1 < d && l < d - 1) {
-                for (e = t(), g = this.C, f = n, h = Math.min(q + 1, d - l), e[f] = 1, k = 1; k < h; k++) {
+                for (e = t(), g = this.A, f = n, h = Math.min(q + 1, d - l), e[f] = 1, k = 1; k < h; k++) {
                   if ((n = c[this.rtl ? d - 1 - l - k : l + k]) && !e[n]) {
                     e[n] = 1;
                     const y = this.score ? this.score(c, f, l, n, k) : I(g + (d / 2 > g ? 0 : 1), d, l, h - 1, k - 1), J = this.bidirectional && n > f;
@@ -117,14 +117,14 @@ H.prototype.add = function(a, c, b, d) {
           }
         }
       }
-      this.fastupdate || this.h.add(a);
+      this.fastupdate || this.reg.add(a);
     }
   }
   return this;
 };
 function K(a, c, b, d, e, f, g) {
-  let h = g ? a.A : a.map, k;
-  c[b] && g && (k = c[b])[g] || (g ? (c = k || (c[b] = t()), c[g] = 1, (k = h.get(g)) ? h = k : h.set(g, h = new Map())) : c[b] = 1, (k = h.get(b)) ? h = k : h.set(b, h = []), h = h[d] || (h[d] = []), f && h.includes(e) || (h.push(e), a.fastupdate && ((c = a.h.get(e)) ? c.push(h) : a.h.set(e, [h]))));
+  let h = g ? a.ctx : a.map, k;
+  c[b] && g && (k = c[b])[g] || (g ? (c = k || (c[b] = t()), c[g] = 1, (k = h.get(g)) ? h = k : h.set(g, h = new Map())) : c[b] = 1, (k = h.get(b)) ? h = k : h.set(b, h = []), h = h[d] || (h[d] = []), f && h.includes(e) || (h.push(e), a.fastupdate && ((c = a.reg.get(e)) ? c.push(h) : a.reg.set(e, [h]))));
 }
 function I(a, c, b, d, e) {
   return b && 1 < a ? c + (d || 0) <= a ? b + (e || 0) : (a - 1) / (c + (d || 0)) * (b + (e || 0)) + 1 | 0 : 0;
@@ -218,7 +218,7 @@ function I(a, c, b, d, e) {
   }
   for (let q, r; p < b; p++) {
     r = a[p];
-    m ? (q = N(this, r, m), q = O(q, d, g, this.C, c, e, 2 === b), g && !1 === q && d.length || (m = r)) : (q = N(this, r), q = O(q, d, g, this.resolution, c, e, 1 === b));
+    m ? (q = N(this, r, m), q = O(q, d, g, this.A, c, e, 2 === b), g && !1 === q && d.length || (m = r)) : (q = N(this, r), q = O(q, d, g, this.resolution, c, e, 1 === b));
     if (q) {
       return q;
     }
@@ -319,11 +319,11 @@ function O(a, c, b, d, e, f, g) {
 function N(a, c, b) {
   let d;
   b && (d = a.bidirectional && c > b);
-  a = b ? (a = a.A.get(d ? c : b)) && a.get(d ? b : c) : a.map.get(c);
+  a = b ? (a = a.ctx.get(d ? c : b)) && a.get(d ? b : c) : a.map.get(c);
   return a;
 }
 ;H.prototype.remove = function(a, c) {
-  const b = this.h.size && (this.fastupdate ? this.h.get(a) : this.h.has(a));
+  const b = this.reg.size && (this.fastupdate ? this.reg.get(a) : this.reg.has(a));
   if (b) {
     if (this.fastupdate) {
       for (let d = 0, e; d < b.length; d++) {
@@ -337,9 +337,9 @@ function N(a, c, b) {
         }
       }
     } else {
-      P(this.map, a), this.depth && P(this.A, a);
+      P(this.map, a), this.depth && P(this.ctx, a);
     }
-    c || this.h.delete(a);
+    c || this.reg.delete(a);
   }
   this.cache && this.cache.remove(a);
   return this;
@@ -383,16 +383,16 @@ function P(a, c) {
   this.score = a.score || null;
   e = !1;
   this.map = new Map();
-  this.A = new Map();
-  this.h = c || (this.fastupdate ? new Map() : new Set());
-  this.C = b.resolution || 1;
+  this.ctx = new Map();
+  this.reg = c || (this.fastupdate ? new Map() : new Set());
+  this.A = b.resolution || 1;
   this.rtl = d.rtl || a.rtl || !1;
   this.cache = (e = a.cache || null) && new v(e);
 }
 H.prototype.clear = function() {
   this.map.clear();
-  this.A.clear();
-  this.h.clear();
+  this.ctx.clear();
+  this.reg.clear();
   this.cache && this.cache.clear();
   return this;
 };
@@ -400,7 +400,7 @@ H.prototype.append = function(a, c) {
   return this.add(a, c, !0);
 };
 H.prototype.contain = function(a) {
-  return this.h.has(a);
+  return this.reg.has(a);
 };
 H.prototype.update = function(a, c) {
   if (this.async) {
@@ -428,7 +428,7 @@ H.prototype.cleanup = function() {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
   Q(this.map);
-  this.depth && Q(this.A);
+  this.depth && Q(this.ctx);
   return this;
 };
 H.prototype.searchCache = function(a, c, b) {
diff --git a/dist/flexsearch.light.module.min.js b/dist/flexsearch.light.module.min.js
index 32d6991..86a7a73 100644
--- a/dist/flexsearch.light.module.min.js
+++ b/dist/flexsearch.light.module.min.js
@@ -5,16 +5,16 @@
  * Hosted by Nextapps GmbH
  * https://github.com/nextapps-de/flexsearch
  */
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+function t(){return Object.create(null)}function u(a,c){return c.length-a.length};function v(a){this.limit=a&&!0!==a?a:1E3;this.cache=new Map;this.h=""}v.prototype.set=function(a,c){this.cache.set(this.h=a,c);this.cache.size>this.limit&&this.cache.delete(this.cache.keys().next().value)};v.prototype.get=function(a){const c=this.cache.get(a);c&&this.h!==a&&(this.cache.delete(a),this.cache.set(this.h=a,c));return c};v.prototype.remove=function(a){for(const c of this.cache){const b=c[0];c[1].includes(a)&&this.cache.delete(b)}};
+v.prototype.clear=function(){this.cache.clear();this.h=""};const w=new Map([["b","p"],["v","f"],["w","f"],["z","s"],["x","s"],["d","t"],["n","m"],["c","k"],["g","k"],["j","k"],["q","k"],["i","e"],["y","e"],["u","o"]]);const x=new Map([["ai","ei"],["ae","a"],["oe","o"],["ue","u"],["sh","s"],["ch","c"],["th","t"],["ph","f"],["pf","f"]]),z=[/([^aeo])h([aeo$])/g,"$1$2",/([aeo])h([^aeo]|$)/g,"$1$2"];const A={a:"",e:"",i:"",o:"",u:"",y:"",b:1,f:1,p:1,v:1,c:2,g:2,j:2,k:2,q:2,s:2,x:2,z:2,"\u00df":2,d:3,t:3,l:4,m:5,n:5,r:6};const B=/[\x00-\x7F]+/g;const C=/[\x00-\x7F]+/g;const D=/[\x00-\x7F]+/g;var E={LatinExact:{normalize:!1,dedupe:!1},LatinDefault:{normalize:function(a){return a.toLowerCase()},dedupe:!1},LatinSimple:{normalize:!0,dedupe:!0},LatinBalance:{normalize:!0,dedupe:!0,mapper:w},LatinAdvanced:{normalize:!0,dedupe:!0,mapper:w,replacer:z,matcher:x},LatinExtra:{normalize:!0,dedupe:!0,mapper:w,replacer:z.concat([/(?!^)[aeoy]/g,""]),matcher:x},LatinSoundex:{normalize:!0,dedupe:!1,include:{letter:!0},finalize:function(a){for(let b=0;b<a.length;b++){var c=a[b];let d=c.charAt(0),e=A[d];
+for(let f=1,g;f<c.length&&(g=c.charAt(f),"h"===g||"w"===g||!(g=A[g])||g===e||(d+=g,e=g,4!==d.length));f++);a[b]=d}}},ArabicDefault:{rtl:!0,normalize:!1,dedupe:!0,prepare:function(a){return(""+a).replace(B," ")}},CjkDefault:{normalize:!1,dedupe:!0,split:"",prepare:function(a){return(""+a).replace(C,"")}},CyrillicDefault:{normalize:!1,dedupe:!0,prepare:function(a){return(""+a).replace(D," ")}}};const F={memory:{resolution:1},performance:{resolution:6,fastupdate:!0,context:{depth:1,resolution:3}},match:{tokenize:"forward"},score:{resolution:9,context:{depth:2,resolution:9}}};function G(a){const c="string"===typeof a?a:a.preset;c&&(a=Object.assign({},F[c],a));return a};t();H.prototype.add=function(a,c,b,d){if(c&&(a||0===a)){if(!d&&!b&&this.reg.has(a))return this.update(a,c);c=this.encoder.encode(c);if(d=c.length){const p=t(),m=t(),q=this.depth,r=this.resolution;for(let l=0;l<d;l++){let n=c[this.rtl?d-1-l:l];var e=n.length;if(e&&(q||!m[n])){var f=this.score?this.score(c,n,l,null,0):J(r,d,l),g="";switch(this.tokenize){case "full":if(2<e){for(f=0;f<e;f++)for(var h=e;h>f;h--){g=n.substring(f,h);var k=this.score?this.score(c,n,l,g,f):J(r,d,l,e,f);K(this,m,g,k,a,b)}break}case "reverse":if(1<
+e){for(h=e-1;0<h;h--)g=n[h]+g,k=this.score?this.score(c,n,l,g,h):J(r,d,l,e,h),K(this,m,g,k,a,b);g=""}case "forward":if(1<e){for(h=0;h<e;h++)g+=n[h],K(this,m,g,f,a,b);break}default:if(K(this,m,n,f,a,b),q&&1<d&&l<d-1)for(e=t(),g=this.A,f=n,h=Math.min(q+1,d-l),e[f]=1,k=1;k<h;k++)if((n=c[this.rtl?d-1-l-k:l+k])&&!e[n]){e[n]=1;const y=this.score?this.score(c,f,l,n,k):J(g+(d/2>g?0:1),d,l,h-1,k-1),I=this.bidirectional&&n>f;K(this,p,I?f:n,y,a,b,I?n:f)}}}}this.fastupdate||this.reg.add(a)}}return this};
+function K(a,c,b,d,e,f,g){let h=g?a.ctx:a.map,k;c[b]&&g&&(k=c[b])[g]||(g?(c=k||(c[b]=t()),c[g]=1,(k=h.get(g))?h=k:h.set(g,h=new Map)):c[b]=1,(k=h.get(b))?h=k:h.set(b,h=[]),h=h[d]||(h[d]=[]),f&&h.includes(e)||(h.push(e),a.fastupdate&&((c=a.reg.get(e))?c.push(h):a.reg.set(e,[h]))))}function J(a,c,b,d,e){return b&&1<a?c+(d||0)<=a?b+(e||0):(a-1)/(c+(d||0))*(b+(e||0))+1|0:0};function L(a,c,b){if(1===a.length)return a=a[0],a=b||a.length>c?c?a.slice(b,b+c):a.slice(b):a;let d=[];for(let e=0,f,g;e<a.length;e++)if((f=a[e])&&(g=f.length)){if(b){if(b>=g){b-=g;continue}b<g&&(f=c?f.slice(b,b+c):f.slice(b),g=f.length,b=0)}if(d.length)g>c&&(f=f.slice(0,c),g=f.length),d.push(f);else{if(g>=c)return g>c&&(f=f.slice(0,c)),f;d=[f]}c-=g;if(!c)break}return d.length?d=1<d.length?[].concat.apply([],d):d[0]:d};H.prototype.search=function(a,c,b){b||(c||"object"!==typeof a?"object"===typeof c&&(b=c,c=0):(b=a,a=""));var d=[],e=0;if(b){a=b.query||a;c=b.limit||c;e=b.offset||0;var f=b.context;var g=!1}a=this.encoder.encode(a);b=a.length;c||(c=100);if(1===b)return M.call(this,a[0],"",c,e);f=this.depth&&!1!==f;if(2===b&&f&&!g)return M.call(this,a[0],a[1],c,e);var h=0,k=0;if(1<b){var p=t();const q=[];for(let r=0,l;r<b;r++)if((l=a[r])&&!p[l]){if(g||N(this,l))q.push(l),p[l]=1;else return d;const n=l.length;h=Math.max(h,
+n);k=k?Math.min(k,n):n}a=q;b=a.length}if(!b)return d;p=0;if(1===b)return M.call(this,a[0],"",c,e);if(2===b&&f&&!g)return M.call(this,a[0],a[1],c,e);if(1<b)if(f){var m=a[0];p=1}else 9<h&&3<h/k&&a.sort(u);for(let q,r;p<b;p++){r=a[p];m?(q=N(this,r,m),q=O(q,d,g,this.A,c,e,2===b),g&&!1===q&&d.length||(m=r)):(q=N(this,r),q=O(q,d,g,this.resolution,c,e,1===b));if(q)return q;if(g&&p===b-1){f=d.length;if(!f){if(m){m="";p=-1;continue}return d}if(1===f)return L(d[0],c,e)}}a:{a=d;d=this.resolution;m=a.length;
 b=[];f=t();for(let q=0,r,l,n,y;q<d;q++)for(k=0;k<m;k++)if(n=a[k],q<n.length&&(r=n[q]))for(p=0;p<r.length;p++)l=r[p],(h=f[l])?f[l]++:(h=0,f[l]=1),y=b[h]||(b[h]=[]),y.push(l);if(a=b.length)if(g){if(1<b.length){g=b;a=[];d=t();f=g.length;for(k=0;k<f;k++)for(m=g[k],h=m.length,p=0;p<h;p++)if(b=m[p],!d[b])if(d[b]=1,e)e--;else if(a.push(b),a.length===c)break;c=a}else c=b[0];b=c}else{if(a<m){d=[];break a}b=b[a-1];if(b.length>c||e)b=b.slice(e,c+e)}d=b}return d};
-function M(a,c,b,d){return(a=N(this,a,c))&&a.length?L(a,b,d):[]}function O(a,c,b,d,e,f,g){let h=[];if(a){d=Math.min(a.length,d);for(let k=0,p=0,m;k<d;k++)if(m=a[k])if(f&&m&&g&&(m.length<=f?(f-=m.length,m=null):(m=m.slice(f),f=0)),m&&(h[k]=m,g&&(p+=m.length,p>=e)))break;if(h.length){if(g)return L(h,e,0);c.push(h);return}}return!b&&h}function N(a,c,b){let d;b&&(d=a.bidirectional&&c>b);a=b?(a=a.A.get(d?c:b))&&a.get(d?b:c):a.map.get(c);return a};H.prototype.remove=function(a,c){const b=this.h.size&&(this.fastupdate?this.h.get(a):this.h.has(a));if(b){if(this.fastupdate)for(let d=0,e;d<b.length;d++){if(e=b[d])if(2>e.length)e.pop();else{const f=e.indexOf(a);f===b.length-1?e.pop():e.splice(f,1)}}else P(this.map,a),this.depth&&P(this.A,a);c||this.h.delete(a)}this.cache&&this.cache.remove(a);return this};
-function P(a,c){let b=0;if(a.constructor===Array)for(let d=0,e,f;d<a.length;d++){if((e=a[d])&&e.length)if(f=e.indexOf(c),0<=f){1<e.length?(e.splice(f,1),b++):delete a[d];break}else b++}else for(let d of a){const e=d[0],f=P(d[1],c);f?b+=f:a.delete(e)}return b};function H(a,c){if(!this)return new H(a);a=a?G(a):{};const b=a.context||{},d=a.encode||a.encoder||function(f){return f.toLowerCase().trim().split(/\s+/)};this.encoder=d.encode?d:"object"===typeof d?d:{encode:d};let e;this.resolution=a.resolution||9;this.tokenize=e=a.tokenize||"strict";this.depth="strict"===e&&b.depth||0;this.bidirectional=!1!==b.bidirectional;this.fastupdate=!!a.fastupdate;this.score=a.score||null;e=!1;this.map=new Map;this.A=new Map;this.h=c||(this.fastupdate?new Map:new Set);this.C=
-b.resolution||1;this.rtl=d.rtl||a.rtl||!1;this.cache=(e=a.cache||null)&&new v(e)}H.prototype.clear=function(){this.map.clear();this.A.clear();this.h.clear();this.cache&&this.cache.clear();return this};H.prototype.append=function(a,c){return this.add(a,c,!0)};H.prototype.contain=function(a){return this.h.has(a)};H.prototype.update=function(a,c){if(this.async){const b=this,d=this.remove(a);return d.then?d.then(()=>b.add(a,c)):this.add(a,c)}return this.remove(a).add(a,c)};
-function Q(a){let c=0;if(a.constructor===Array)for(let b=0,d;b<a.length;b++)(d=a[b])&&(c+=d.length);else for(const b of a){const d=b[0],e=Q(b[1]);e?c+=e:a.delete(d)}return c}H.prototype.cleanup=function(){if(!this.fastupdate)return this;Q(this.map);this.depth&&Q(this.A);return this};
+function M(a,c,b,d){return(a=N(this,a,c))&&a.length?L(a,b,d):[]}function O(a,c,b,d,e,f,g){let h=[];if(a){d=Math.min(a.length,d);for(let k=0,p=0,m;k<d;k++)if(m=a[k])if(f&&m&&g&&(m.length<=f?(f-=m.length,m=null):(m=m.slice(f),f=0)),m&&(h[k]=m,g&&(p+=m.length,p>=e)))break;if(h.length){if(g)return L(h,e,0);c.push(h);return}}return!b&&h}function N(a,c,b){let d;b&&(d=a.bidirectional&&c>b);a=b?(a=a.ctx.get(d?c:b))&&a.get(d?b:c):a.map.get(c);return a};H.prototype.remove=function(a,c){const b=this.reg.size&&(this.fastupdate?this.reg.get(a):this.reg.has(a));if(b){if(this.fastupdate)for(let d=0,e;d<b.length;d++){if(e=b[d])if(2>e.length)e.pop();else{const f=e.indexOf(a);f===b.length-1?e.pop():e.splice(f,1)}}else P(this.map,a),this.depth&&P(this.ctx,a);c||this.reg.delete(a)}this.cache&&this.cache.remove(a);return this};
+function P(a,c){let b=0;if(a.constructor===Array)for(let d=0,e,f;d<a.length;d++){if((e=a[d])&&e.length)if(f=e.indexOf(c),0<=f){1<e.length?(e.splice(f,1),b++):delete a[d];break}else b++}else for(let d of a){const e=d[0],f=P(d[1],c);f?b+=f:a.delete(e)}return b};function H(a,c){if(!this)return new H(a);a=a?G(a):{};const b=a.context||{},d=a.encode||a.encoder||function(f){return f.toLowerCase().trim().split(/\s+/)};this.encoder=d.encode?d:"object"===typeof d?d:{encode:d};let e;this.resolution=a.resolution||9;this.tokenize=e=a.tokenize||"strict";this.depth="strict"===e&&b.depth||0;this.bidirectional=!1!==b.bidirectional;this.fastupdate=!!a.fastupdate;this.score=a.score||null;e=!1;this.map=new Map;this.ctx=new Map;this.reg=c||(this.fastupdate?new Map:new Set);
+this.A=b.resolution||1;this.rtl=d.rtl||a.rtl||!1;this.cache=(e=a.cache||null)&&new v(e)}H.prototype.clear=function(){this.map.clear();this.ctx.clear();this.reg.clear();this.cache&&this.cache.clear();return this};H.prototype.append=function(a,c){return this.add(a,c,!0)};H.prototype.contain=function(a){return this.reg.has(a)};H.prototype.update=function(a,c){if(this.async){const b=this,d=this.remove(a);return d.then?d.then(()=>b.add(a,c)):this.add(a,c)}return this.remove(a).add(a,c)};
+function Q(a){let c=0;if(a.constructor===Array)for(let b=0,d;b<a.length;b++)(d=a[b])&&(c+=d.length);else for(const b of a){const d=b[0],e=Q(b[1]);e?c+=e:a.delete(d)}return c}H.prototype.cleanup=function(){if(!this.fastupdate)return this;Q(this.map);this.depth&&Q(this.ctx);return this};
 H.prototype.searchCache=function(a,c,b){a=("object"===typeof a?""+a.query:a).toLowerCase();let d=this.cache.get(a);if(!d){d=this.search(a,c,b);if(d.then){const e=this;d.then(function(f){e.cache.set(a,f);return f})}this.cache.set(a,d)}return d};export default {Index:H,Charset:E,Encoder:null,Document:null,Worker:null,Resolver:null,IndexedDB:null,Language:{}};
 export const Index=H;export const Charset=E;export const Encoder=null;export const Document=null;export const Worker=null;export const Resolver=null;export const IndexedDB=null;export const Language={};
\ No newline at end of file
diff --git a/dist/module-debug/index.js b/dist/module-debug/index.js
index 06ef547..a52c37a 100644
--- a/dist/module-debug/index.js
+++ b/dist/module-debug/index.js
@@ -12,7 +12,7 @@ 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 } from "./serialize.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";
@@ -207,6 +207,7 @@ 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-debug/serialize.js b/dist/module-debug/serialize.js
index 66ad30b..9603225 100644
--- a/dist/module-debug/serialize.js
+++ b/dist/module-debug/serialize.js
@@ -276,4 +276,165 @@ export function importDocument(key, data) {
                 this.index[field].import(key, data);
             }
     }
-}
\ No newline at end of file
+}
+
+/*
+reg: "1,2,3,4,5,6,7,8,9"
+map: "gulliver:1,2,3|4,5,6|7,8,9;"
+ctx: "gulliver+travel:1,2,3|4,5,6|7,8,9;"
+*/
+
+/**
+ * @this Index
+ * @param {boolean} withFunctionWrapper
+ * @return {string}
+ */
+
+export function serialize(withFunctionWrapper = !0) {
+
+    if (!this.reg.size) return "";
+
+    let reg = '',
+        type = "";
+
+    for (const key of this.reg.keys()) {
+        type || (type = typeof key);
+        reg += (reg ? ',' : '') + ("string" == type ? '"' + key + '"' : key);
+    }
+    reg = 'index.reg=new Set([' + reg + ']);';
+
+    let map = '';
+    for (const item of this.map.entries()) {
+        const key = item[0],
+              value = item[1];
+
+        let res = '';
+        for (let i = 0, ids; i < value.length; i++) {
+            ids = value[i] || [''];
+            let str = '';
+            for (let j = 0; j < ids.length; j++) {
+                str += (str ? ',' : '') + ("string" == type ? '"' + ids[j] + '"' : ids[j]);
+            }
+            str = '[' + str + ']';
+            res += (res ? ',' : '') + str;
+        }
+        res = '["' + key + '",[' + res + ']]';
+        map += (map ? ',' : '') + res;
+    }
+    map = "index.map=new Map([" + map + "]);";
+
+    let ctx = '';
+    for (const context of this.ctx.entries()) {
+        const key_ctx = context[0],
+              value_ctx = context[1];
+
+
+        for (const item of value_ctx.entries()) {
+            const key = item[0],
+                  value = item[1];
+
+
+            let res = '';
+            for (let i = 0, ids; i < value.length; i++) {
+                ids = value[i] || [''];
+                let str = '';
+                for (let j = 0; j < ids.length; j++) {
+                    str += (str ? ',' : '') + ("string" == type ? '"' + ids[j] + '"' : ids[j]);
+                }
+                str = '[' + str + ']';
+                res += (res ? ',' : '') + str;
+            }
+            res = 'new Map([["' + key + '",[' + res + ']]])';
+            res = '["' + key_ctx + '",' + res + ']';
+            ctx += (ctx ? ',' : '') + res;
+        }
+    }
+    ctx = "index.ctx=new Map([" + ctx + "]);";
+
+    return withFunctionWrapper ? "function inject(index){" + reg + map + ctx + "}" : reg + map + ctx;
+}
+
+// export function exportSnapshot(flexsearch){
+//
+//     if(!flexsearch.reg.size) return;
+//
+//     let reg = '';
+//     let type = "";
+//     for(const key of flexsearch.reg.keys()){
+//         type || (type = typeof key);
+//         reg += (reg ? ',' : '') + (type === "string" ? '"' + key + '"' : key);
+//     }
+//     reg = "f.reg=[" + reg + "];";
+//
+//     let map = '';
+//     for(const item of flexsearch.map.entries()){
+//         const key = item[0];
+//         const value = item[1];
+//         let res = '';
+//         for(let i = 0, ids; i < value.length; i++){
+//             ids = value[i] || [''];
+//             let str = '';
+//             for(let j = 0; j < ids.length; j++){
+//                 str += (str ? ',' : '') + (type === "string" ? '"' + ids[j] + '"' : ids[j]);
+//             }
+//             str = "[
+//             res += (res ? '|' : '') + str;
+//         }
+//         map += (map ? ';' : '') + key + ':' + res;
+//     }
+//
+//
+//     let ctx = '';
+//     for(const context of flexsearch.ctx.entries()){
+//         const key_ctx = context[0];
+//         const value_ctx = context[1];
+//
+//         for(const item of value_ctx.entries()){
+//             const key = item[0];
+//             const value = item[1];
+//
+//             let res = '';
+//             for(let i = 0, ids; i < value.length; i++){
+//                 ids = value[i] || [''];
+//                 let str = '';
+//                 for(let j = 0; j < ids.length; j++){
+//                     str += (str ? ',' : '') + (type === "string" ? '"' + ids[j] + '"' : ids[j]);
+//                 }
+//                 res += (res ? '|' : '') + str;
+//             }
+//             ctx += (ctx ? ';' : '') + key_ctx + '+' + key + ':' + res;
+//         }
+//     }
+//
+//     return reg + '#' + map + '#' + ctx;
+// }
+//
+// export function importSnapshot(flexsearch, input){
+//
+//     if(!input) return;
+//
+//     let pos_reg = input.indexOf("#");
+//     const reg = input.substring(0, pos_reg).split(",");
+//     flexsearch.reg = new Set(reg);
+//
+//     let pos_map = input.indexOf("#", pos_reg + 1);
+//     const map = input.substring(pos_reg + 1, pos_map).split(";").map(res => {
+//         const split = res.split(":");
+//         split[1] = split[1].split("|").map(ids => ids ? ids.split(",") : null);
+//         return split;
+//     });
+//     flexsearch.map = new Map(map);
+//
+//     input = input.substring(pos_map + 1);
+//     if(input){
+//         const ctx = input.split(";").map(res => {
+//             const split = res.split(":");
+//             const context = split[0].split("+");
+//             const map = new Map([
+//                 [context[1], split[1].split("|").map(ids => ids ? ids.split(",") : null)]
+//             ]);
+//             return [context[0], map]
+//         });
+//         flexsearch.ctx = new Map(ctx);
+//     }
+// }
\ No newline at end of file
diff --git a/dist/module-debug/webpack.js b/dist/module-debug/webpack.js
index 4481606..0a1343e 100644
--- a/dist/module-debug/webpack.js
+++ b/dist/module-debug/webpack.js
@@ -24,10 +24,15 @@ import Charset from "./charset.js";
 /** @export */Index.prototype.removeAsync;
 /** @export */Index.prototype.export;
 /** @export */Index.prototype.import;
+/** @export */Index.prototype.serialize;
 /** @export */Index.prototype.mount;
 /** @export */Index.prototype.commit;
 /** @export */Index.db;
 
+/** @export */Index.prototype.reg;
+/** @export */Index.prototype.map;
+/** @export */Index.prototype.ctx;
+
 /** @export */Document.prototype.add;
 /** @export */Document.prototype.append;
 /** @export */Document.prototype.search;
diff --git a/dist/module-min/index.js b/dist/module-min/index.js
index e34a00e..99be301 100644
--- a/dist/module-min/index.js
+++ b/dist/module-min/index.js
@@ -1 +1 @@
-import{IndexOptions,ContextOptions}from"./type.js";import Encoder from"./encoder.js";import Cache,{searchCache}from"./cache.js";import Charset from"./charset.js";import{KeystoreMap,KeystoreSet}from"./keystore.js";import{is_array,is_string}from"./common.js";import{exportIndex,importIndex}from"./serialize.js";import default_encoder from"./charset/latin/default.js";import apply_preset from"./preset.js";import apply_async from"./async.js";import tick from"./profiler.js";import"./index/add.js";import"./index/search.js";import"./index/remove.js";export default function Index(a,b){if(!this)return new Index(a);!1,a=a?apply_preset(a):{};const c=a.context||{},d=a.encode||a.encoder||default_encoder;this.encoder=d.encode?d:"object"==typeof d?new Encoder(d):{encode:d},this.compress=a.compress||a.compression||!1;let e;this.resolution=a.resolution||9,this.tokenize=e=a.tokenize||"strict",this.depth="strict"===e&&c.depth||0,this.bidirectional=!1!==c.bidirectional,this.fastupdate=!!a.fastupdate,this.score=a.score||null,e=a.keystore||0,e&&(this.keystore=e),this.map=e&&!0?new KeystoreMap(e):new Map,this.ctx=e&&!0?new KeystoreMap(e):new Map,this.reg=b||(this.fastupdate?e&&!0?new KeystoreMap(e):new Map:e&&!0?new KeystoreSet(e):new Set),this.resolution_ctx=c.resolution||1,this.rtl=d.rtl||a.rtl||!1,this.cache=(e=a.cache||null)&&new Cache(e),this.resolve=!1!==a.resolve,(e=a.db)&&(this.db=e.mount(this)),this.commit_auto=!1!==a.commit,this.commit_task=[],this.commit_timer=null}Index.prototype.mount=function(a){return this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null),a.mount(this)},Index.prototype.commit=function(a,b){return this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null),this.db.commit(this,a,b)};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){if(this.async){const c=this,d=this.remove(a);return d.then?d.then(()=>c.add(a,b)):this.add(a,b)}return this.remove(a).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,apply_async(Index.prototype);
\ No newline at end of file
+import{IndexOptions,ContextOptions}from"./type.js";import Encoder from"./encoder.js";import Cache,{searchCache}from"./cache.js";import Charset from"./charset.js";import{KeystoreMap,KeystoreSet}from"./keystore.js";import{is_array,is_string}from"./common.js";import{exportIndex,importIndex,serialize}from"./serialize.js";import default_encoder from"./charset/latin/default.js";import apply_preset from"./preset.js";import apply_async from"./async.js";import tick from"./profiler.js";import"./index/add.js";import"./index/search.js";import"./index/remove.js";export default function Index(a,b){if(!this)return new Index(a);!1,a=a?apply_preset(a):{};const c=a.context||{},d=a.encode||a.encoder||default_encoder;this.encoder=d.encode?d:"object"==typeof d?new Encoder(d):{encode:d},this.compress=a.compress||a.compression||!1;let e;this.resolution=a.resolution||9,this.tokenize=e=a.tokenize||"strict",this.depth="strict"===e&&c.depth||0,this.bidirectional=!1!==c.bidirectional,this.fastupdate=!!a.fastupdate,this.score=a.score||null,e=a.keystore||0,e&&(this.keystore=e),this.map=e&&!0?new KeystoreMap(e):new Map,this.ctx=e&&!0?new KeystoreMap(e):new Map,this.reg=b||(this.fastupdate?e&&!0?new KeystoreMap(e):new Map:e&&!0?new KeystoreSet(e):new Set),this.resolution_ctx=c.resolution||1,this.rtl=d.rtl||a.rtl||!1,this.cache=(e=a.cache||null)&&new Cache(e),this.resolve=!1!==a.resolve,(e=a.db)&&(this.db=e.mount(this)),this.commit_auto=!1!==a.commit,this.commit_task=[],this.commit_timer=null}Index.prototype.mount=function(a){return this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null),a.mount(this)},Index.prototype.commit=function(a,b){return this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null),this.db.commit(this,a,b)};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){if(this.async){const c=this,d=this.remove(a);return d.then?d.then(()=>c.add(a,b)):this.add(a,b)}return this.remove(a).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 b9fd0fd..0bdddbe 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{create_object,is_string}from"./common.js";function async(a,b,c,d,e,f,g,h){const i=a(c?c+"."+d:d,JSON.stringify(g));i&&i.then?i.then(function(){b.export(a,b,c,e,f+1,h)}):b.export(a,b,c,e,f+1,h)}export function exportIndex(a,b,c,d,e,f){let g=!0;"undefined"==typeof f&&(g=new Promise(a=>{f=a}));let h,i;switch(e||(e=0)){case 0:if(h="reg",this.fastupdate){i=create_object();for(let a of this.reg.keys())i[a]=1}else i=this.reg;break;case 1:h="cfg",i={doc:0,opt:this.optimize?1:0};break;case 2:h="map",i=this.map;break;case 3:h="ctx",i=this.ctx;break;default:return void("undefined"==typeof c&&f&&f());}return async(a,b||this,c,h,d,e,i,f),g}export function importIndex(a,b){b&&(is_string(b)&&(b=JSON.parse(b)),"cfg"===a?this.optimize=!!b.opt:"reg"===a?(this.fastupdate=!1,this.reg=b):"map"===a?this.map=b:"ctx"===a?this.ctx=b:void 0)}export function exportDocument(a,b,c,d,e,f){let g;if("undefined"==typeof f&&(g=new Promise(a=>{f=a})),e||(e=0),d||(d=0),d<this.field.length){const c=this.field[d],g=this.index[c];b=this,g.export(a,b,e?c:"",d,e++,f)||(d++,e=1,b.export(a,b,c,d,e,f))}else{let b,g;switch(e){case 1:b="tag",g=this.tagindex,c=null;break;case 2:b="store",g=this.store,c=null;break;default:return void f();}async(a,this,c,b,d,e,g,f)}return g}export function importDocument(a,b){if(b)switch(is_string(b)&&(b=JSON.parse(b)),a){case"tag":this.tagindex=b;break;case"reg":this.fastupdate=!1,this.reg=b;for(let a,c=0;c<this.field.length;c++)a=this.index[this.field[c]],a.reg=b,a.fastupdate=!1;break;case"store":this.store=b;break;default:a=a.split(".");const c=a[0];a=a[1],c&&a&&this.index[c].import(a,b);}}
\ No newline at end of file
+import Index from"./index.js";import Document from"./document.js";import{create_object,is_string}from"./common.js";function async(a,b,c,d,e,f,g,h){const i=a(c?c+"."+d:d,JSON.stringify(g));i&&i.then?i.then(function(){b.export(a,b,c,e,f+1,h)}):b.export(a,b,c,e,f+1,h)}export function exportIndex(a,b,c,d,e,f){let g=!0;"undefined"==typeof f&&(g=new Promise(a=>{f=a}));let h,i;switch(e||(e=0)){case 0:if(h="reg",this.fastupdate){i=create_object();for(let a of this.reg.keys())i[a]=1}else i=this.reg;break;case 1:h="cfg",i={doc:0,opt:this.optimize?1:0};break;case 2:h="map",i=this.map;break;case 3:h="ctx",i=this.ctx;break;default:return void("undefined"==typeof c&&f&&f());}return async(a,b||this,c,h,d,e,i,f),g}export function importIndex(a,b){b&&(is_string(b)&&(b=JSON.parse(b)),"cfg"===a?this.optimize=!!b.opt:"reg"===a?(this.fastupdate=!1,this.reg=b):"map"===a?this.map=b:"ctx"===a?this.ctx=b:void 0)}export function exportDocument(a,b,c,d,e,f){let g;if("undefined"==typeof f&&(g=new Promise(a=>{f=a})),e||(e=0),d||(d=0),d<this.field.length){const c=this.field[d],g=this.index[c];b=this,g.export(a,b,e?c:"",d,e++,f)||(d++,e=1,b.export(a,b,c,d,e,f))}else{let b,g;switch(e){case 1:b="tag",g=this.tagindex,c=null;break;case 2:b="store",g=this.store,c=null;break;default:return void f();}async(a,this,c,b,d,e,g,f)}return g}export function importDocument(a,b){if(b)switch(is_string(b)&&(b=JSON.parse(b)),a){case"tag":this.tagindex=b;break;case"reg":this.fastupdate=!1,this.reg=b;for(let a,c=0;c<this.field.length;c++)a=this.index[this.field[c]],a.reg=b,a.fastupdate=!1;break;case"store":this.store=b;break;default:a=a.split(".");const c=a[0];a=a[1],c&&a&&this.index[c].import(a,b);}}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/webpack.js b/dist/module-min/webpack.js
index 04010c5..33dc666 100644
--- a/dist/module-min/webpack.js
+++ b/dist/module-min/webpack.js
@@ -1 +1 @@
-import{SearchOptions,ContextOptions,DocumentDescriptor,DocumentSearchOptions,DocumentIndexOptions,IndexOptions,DocumentOptions,TagOptions,StoreOptions,EncoderOptions,EncoderSplitOptions}from"./type.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.mount,Index.prototype.commit,Index.db,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.db,Document.prototype.export,Document.prototype.import,Document.prototype.searchCache,Document.prototype.get,Document.prototype.set,Resolver.prototype.limit,Resolver.prototype.offset,Resolver.prototype.boost,Resolver.prototype.resolve,Resolver.prototype.or,Resolver.prototype.and,Resolver.prototype.xor,Resolver.prototype.not,Charset.LatinExact,Charset.LatinDefault,Charset.LatinSimple,Charset.LatinBalance,Charset.LatinAdvanced,Charset.LatinExtra,Charset.LatinSoundex,Charset.ArabicDefault,Charset.CjkDefault,Charset.CyrillicDefault,IndexOptions.preset,IndexOptions.context,IndexOptions.encoder,IndexOptions.encode,IndexOptions.resolution,IndexOptions.tokenize,IndexOptions.fastupdate,IndexOptions.score,IndexOptions.keystore,IndexOptions.rtl,IndexOptions.cache,IndexOptions.resolve,IndexOptions.db,IndexOptions.config,DocumentIndexOptions.preset,DocumentIndexOptions.context,DocumentIndexOptions.encoder,DocumentIndexOptions.encode,DocumentIndexOptions.resolution,DocumentIndexOptions.tokenize,DocumentIndexOptions.fastupdate,DocumentIndexOptions.score,DocumentIndexOptions.keystore,DocumentIndexOptions.rtl,DocumentIndexOptions.cache,DocumentIndexOptions.db,DocumentIndexOptions.config,DocumentIndexOptions.field,DocumentIndexOptions.filter,DocumentIndexOptions.custom,DocumentOptions.context,DocumentOptions.encoder,DocumentOptions.encode,DocumentOptions.resolution,DocumentOptions.tokenize,DocumentOptions.fastupdate,DocumentOptions.score,DocumentOptions.keystore,DocumentOptions.rtl,DocumentOptions.cache,DocumentOptions.db,DocumentOptions.doc,DocumentOptions.document,DocumentOptions.worker,ContextOptions.depth,ContextOptions.bidirectional,ContextOptions.resolution,DocumentDescriptor.field,DocumentDescriptor.index,DocumentDescriptor.tag,DocumentDescriptor.store,TagOptions.field,TagOptions.tag,TagOptions.filter,TagOptions.custom,TagOptions.keystore,TagOptions.db,TagOptions.config,StoreOptions.field,StoreOptions.filter,StoreOptions.custom,StoreOptions.config,SearchOptions.query,SearchOptions.limit,SearchOptions.offset,SearchOptions.context,SearchOptions.suggest,SearchOptions.resolve,SearchOptions.enrich,DocumentSearchOptions.query,DocumentSearchOptions.limit,DocumentSearchOptions.offset,DocumentSearchOptions.context,DocumentSearchOptions.suggest,DocumentSearchOptions.enrich,DocumentSearchOptions.tag,DocumentSearchOptions.field,DocumentSearchOptions.index,DocumentSearchOptions.pluck,DocumentSearchOptions.merge,EncoderOptions.rtl,EncoderOptions.dedupe,EncoderOptions.split,EncoderOptions.include,EncoderOptions.exclude,EncoderOptions.prepare,EncoderOptions.finalize,EncoderOptions.filter,EncoderOptions.matcher,EncoderOptions.mapper,EncoderOptions.stemmer,EncoderOptions.replacer,EncoderOptions.minlength,EncoderOptions.maxlength,EncoderOptions.cache,EncoderSplitOptions.letter,EncoderSplitOptions.number,EncoderSplitOptions.symbol,EncoderSplitOptions.punctuation,EncoderSplitOptions.control,EncoderSplitOptions.char;const FlexSearch={Index:Index,Charset:Charset,Encoder:Encoder,Document:Document,Worker:WorkerIndex,Resolver:Resolver,IndexedDB:IdxDB,Language:{}};{FlexSearch.Language={};const a=self;let b;(b=a.define)&&b.amd?b([],function(){return FlexSearch}):"object"==typeof a.exports?a.exports=FlexSearch:a.FlexSearch=FlexSearch}
\ No newline at end of file
+import{SearchOptions,ContextOptions,DocumentDescriptor,DocumentSearchOptions,DocumentIndexOptions,IndexOptions,DocumentOptions,TagOptions,StoreOptions,EncoderOptions,EncoderSplitOptions}from"./type.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.db,Index.prototype.reg,Index.prototype.map,Index.prototype.ctx,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.db,Document.prototype.export,Document.prototype.import,Document.prototype.searchCache,Document.prototype.get,Document.prototype.set,Resolver.prototype.limit,Resolver.prototype.offset,Resolver.prototype.boost,Resolver.prototype.resolve,Resolver.prototype.or,Resolver.prototype.and,Resolver.prototype.xor,Resolver.prototype.not,Charset.LatinExact,Charset.LatinDefault,Charset.LatinSimple,Charset.LatinBalance,Charset.LatinAdvanced,Charset.LatinExtra,Charset.LatinSoundex,Charset.ArabicDefault,Charset.CjkDefault,Charset.CyrillicDefault,IndexOptions.preset,IndexOptions.context,IndexOptions.encoder,IndexOptions.encode,IndexOptions.resolution,IndexOptions.tokenize,IndexOptions.fastupdate,IndexOptions.score,IndexOptions.keystore,IndexOptions.rtl,IndexOptions.cache,IndexOptions.resolve,IndexOptions.db,IndexOptions.config,DocumentIndexOptions.preset,DocumentIndexOptions.context,DocumentIndexOptions.encoder,DocumentIndexOptions.encode,DocumentIndexOptions.resolution,DocumentIndexOptions.tokenize,DocumentIndexOptions.fastupdate,DocumentIndexOptions.score,DocumentIndexOptions.keystore,DocumentIndexOptions.rtl,DocumentIndexOptions.cache,DocumentIndexOptions.db,DocumentIndexOptions.config,DocumentIndexOptions.field,DocumentIndexOptions.filter,DocumentIndexOptions.custom,DocumentOptions.context,DocumentOptions.encoder,DocumentOptions.encode,DocumentOptions.resolution,DocumentOptions.tokenize,DocumentOptions.fastupdate,DocumentOptions.score,DocumentOptions.keystore,DocumentOptions.rtl,DocumentOptions.cache,DocumentOptions.db,DocumentOptions.doc,DocumentOptions.document,DocumentOptions.worker,ContextOptions.depth,ContextOptions.bidirectional,ContextOptions.resolution,DocumentDescriptor.field,DocumentDescriptor.index,DocumentDescriptor.tag,DocumentDescriptor.store,TagOptions.field,TagOptions.tag,TagOptions.filter,TagOptions.custom,TagOptions.keystore,TagOptions.db,TagOptions.config,StoreOptions.field,StoreOptions.filter,StoreOptions.custom,StoreOptions.config,SearchOptions.query,SearchOptions.limit,SearchOptions.offset,SearchOptions.context,SearchOptions.suggest,SearchOptions.resolve,SearchOptions.enrich,DocumentSearchOptions.query,DocumentSearchOptions.limit,DocumentSearchOptions.offset,DocumentSearchOptions.context,DocumentSearchOptions.suggest,DocumentSearchOptions.enrich,DocumentSearchOptions.tag,DocumentSearchOptions.field,DocumentSearchOptions.index,DocumentSearchOptions.pluck,DocumentSearchOptions.merge,EncoderOptions.rtl,EncoderOptions.dedupe,EncoderOptions.split,EncoderOptions.include,EncoderOptions.exclude,EncoderOptions.prepare,EncoderOptions.finalize,EncoderOptions.filter,EncoderOptions.matcher,EncoderOptions.mapper,EncoderOptions.stemmer,EncoderOptions.replacer,EncoderOptions.minlength,EncoderOptions.maxlength,EncoderOptions.cache,EncoderSplitOptions.letter,EncoderSplitOptions.number,EncoderSplitOptions.symbol,EncoderSplitOptions.punctuation,EncoderSplitOptions.control,EncoderSplitOptions.char;const FlexSearch={Index:Index,Charset:Charset,Encoder:Encoder,Document:Document,Worker:WorkerIndex,Resolver:Resolver,IndexedDB:IdxDB,Language:{}};{FlexSearch.Language={};const a=self;let b;(b=a.define)&&b.amd?b([],function(){return FlexSearch}):"object"==typeof a.exports?a.exports=FlexSearch:a.FlexSearch=FlexSearch}
\ No newline at end of file
diff --git a/dist/module/index.js b/dist/module/index.js
index 23c01db..90a5974 100644
--- a/dist/module/index.js
+++ b/dist/module/index.js
@@ -12,7 +12,7 @@ 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 } from "./serialize.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";
@@ -206,6 +206,7 @@ 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/serialize.js b/dist/module/serialize.js
index 66ad30b..9603225 100644
--- a/dist/module/serialize.js
+++ b/dist/module/serialize.js
@@ -276,4 +276,165 @@ export function importDocument(key, data) {
                 this.index[field].import(key, data);
             }
     }
-}
\ No newline at end of file
+}
+
+/*
+reg: "1,2,3,4,5,6,7,8,9"
+map: "gulliver:1,2,3|4,5,6|7,8,9;"
+ctx: "gulliver+travel:1,2,3|4,5,6|7,8,9;"
+*/
+
+/**
+ * @this Index
+ * @param {boolean} withFunctionWrapper
+ * @return {string}
+ */
+
+export function serialize(withFunctionWrapper = !0) {
+
+    if (!this.reg.size) return "";
+
+    let reg = '',
+        type = "";
+
+    for (const key of this.reg.keys()) {
+        type || (type = typeof key);
+        reg += (reg ? ',' : '') + ("string" == type ? '"' + key + '"' : key);
+    }
+    reg = 'index.reg=new Set([' + reg + ']);';
+
+    let map = '';
+    for (const item of this.map.entries()) {
+        const key = item[0],
+              value = item[1];
+
+        let res = '';
+        for (let i = 0, ids; i < value.length; i++) {
+            ids = value[i] || [''];
+            let str = '';
+            for (let j = 0; j < ids.length; j++) {
+                str += (str ? ',' : '') + ("string" == type ? '"' + ids[j] + '"' : ids[j]);
+            }
+            str = '[' + str + ']';
+            res += (res ? ',' : '') + str;
+        }
+        res = '["' + key + '",[' + res + ']]';
+        map += (map ? ',' : '') + res;
+    }
+    map = "index.map=new Map([" + map + "]);";
+
+    let ctx = '';
+    for (const context of this.ctx.entries()) {
+        const key_ctx = context[0],
+              value_ctx = context[1];
+
+
+        for (const item of value_ctx.entries()) {
+            const key = item[0],
+                  value = item[1];
+
+
+            let res = '';
+            for (let i = 0, ids; i < value.length; i++) {
+                ids = value[i] || [''];
+                let str = '';
+                for (let j = 0; j < ids.length; j++) {
+                    str += (str ? ',' : '') + ("string" == type ? '"' + ids[j] + '"' : ids[j]);
+                }
+                str = '[' + str + ']';
+                res += (res ? ',' : '') + str;
+            }
+            res = 'new Map([["' + key + '",[' + res + ']]])';
+            res = '["' + key_ctx + '",' + res + ']';
+            ctx += (ctx ? ',' : '') + res;
+        }
+    }
+    ctx = "index.ctx=new Map([" + ctx + "]);";
+
+    return withFunctionWrapper ? "function inject(index){" + reg + map + ctx + "}" : reg + map + ctx;
+}
+
+// export function exportSnapshot(flexsearch){
+//
+//     if(!flexsearch.reg.size) return;
+//
+//     let reg = '';
+//     let type = "";
+//     for(const key of flexsearch.reg.keys()){
+//         type || (type = typeof key);
+//         reg += (reg ? ',' : '') + (type === "string" ? '"' + key + '"' : key);
+//     }
+//     reg = "f.reg=[" + reg + "];";
+//
+//     let map = '';
+//     for(const item of flexsearch.map.entries()){
+//         const key = item[0];
+//         const value = item[1];
+//         let res = '';
+//         for(let i = 0, ids; i < value.length; i++){
+//             ids = value[i] || [''];
+//             let str = '';
+//             for(let j = 0; j < ids.length; j++){
+//                 str += (str ? ',' : '') + (type === "string" ? '"' + ids[j] + '"' : ids[j]);
+//             }
+//             str = "[
+//             res += (res ? '|' : '') + str;
+//         }
+//         map += (map ? ';' : '') + key + ':' + res;
+//     }
+//
+//
+//     let ctx = '';
+//     for(const context of flexsearch.ctx.entries()){
+//         const key_ctx = context[0];
+//         const value_ctx = context[1];
+//
+//         for(const item of value_ctx.entries()){
+//             const key = item[0];
+//             const value = item[1];
+//
+//             let res = '';
+//             for(let i = 0, ids; i < value.length; i++){
+//                 ids = value[i] || [''];
+//                 let str = '';
+//                 for(let j = 0; j < ids.length; j++){
+//                     str += (str ? ',' : '') + (type === "string" ? '"' + ids[j] + '"' : ids[j]);
+//                 }
+//                 res += (res ? '|' : '') + str;
+//             }
+//             ctx += (ctx ? ';' : '') + key_ctx + '+' + key + ':' + res;
+//         }
+//     }
+//
+//     return reg + '#' + map + '#' + ctx;
+// }
+//
+// export function importSnapshot(flexsearch, input){
+//
+//     if(!input) return;
+//
+//     let pos_reg = input.indexOf("#");
+//     const reg = input.substring(0, pos_reg).split(",");
+//     flexsearch.reg = new Set(reg);
+//
+//     let pos_map = input.indexOf("#", pos_reg + 1);
+//     const map = input.substring(pos_reg + 1, pos_map).split(";").map(res => {
+//         const split = res.split(":");
+//         split[1] = split[1].split("|").map(ids => ids ? ids.split(",") : null);
+//         return split;
+//     });
+//     flexsearch.map = new Map(map);
+//
+//     input = input.substring(pos_map + 1);
+//     if(input){
+//         const ctx = input.split(";").map(res => {
+//             const split = res.split(":");
+//             const context = split[0].split("+");
+//             const map = new Map([
+//                 [context[1], split[1].split("|").map(ids => ids ? ids.split(",") : null)]
+//             ]);
+//             return [context[0], map]
+//         });
+//         flexsearch.ctx = new Map(ctx);
+//     }
+// }
\ No newline at end of file
diff --git a/dist/module/webpack.js b/dist/module/webpack.js
index 4481606..0a1343e 100644
--- a/dist/module/webpack.js
+++ b/dist/module/webpack.js
@@ -24,10 +24,15 @@ import Charset from "./charset.js";
 /** @export */Index.prototype.removeAsync;
 /** @export */Index.prototype.export;
 /** @export */Index.prototype.import;
+/** @export */Index.prototype.serialize;
 /** @export */Index.prototype.mount;
 /** @export */Index.prototype.commit;
 /** @export */Index.db;
 
+/** @export */Index.prototype.reg;
+/** @export */Index.prototype.map;
+/** @export */Index.prototype.ctx;
+
 /** @export */Document.prototype.add;
 /** @export */Document.prototype.append;
 /** @export */Document.prototype.search;
diff --git a/src/index.js b/src/index.js
index fa6be4d..c611952 100644
--- a/src/index.js
+++ b/src/index.js
@@ -30,7 +30,7 @@ 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 } from "./serialize.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";
@@ -262,6 +262,7 @@ if(SUPPORT_SERIALIZE){
 
     Index.prototype.export = exportIndex;
     Index.prototype.import = importIndex;
+    Index.prototype.serialize = serialize;
 }
 
 if(SUPPORT_ASYNC){
diff --git a/src/serialize.js b/src/serialize.js
index d7dac2b..5b74fb8 100644
--- a/src/serialize.js
+++ b/src/serialize.js
@@ -279,3 +279,162 @@ export function importDocument(key, data){
             }
     }
 }
+
+/*
+reg: "1,2,3,4,5,6,7,8,9"
+map: "gulliver:1,2,3|4,5,6|7,8,9;"
+ctx: "gulliver+travel:1,2,3|4,5,6|7,8,9;"
+*/
+
+/**
+ * @this Index
+ * @param {boolean} withFunctionWrapper
+ * @return {string}
+ */
+
+export function serialize(withFunctionWrapper = true){
+
+    if(!this.reg.size) return "";
+
+    let reg = '';
+    let type = "";
+    for(const key of this.reg.keys()){
+        type || (type = typeof key);
+        reg += (reg ? ',' : '') + (type === "string" ? '"' + key + '"' : key);
+    }
+    reg = 'index.reg=new Set([' + reg + ']);';
+
+    let map = '';
+    for(const item of this.map.entries()){
+        const key = item[0];
+        const value = item[1];
+        let res = '';
+        for(let i = 0, ids; i < value.length; i++){
+            ids = value[i] || [''];
+            let str = '';
+            for(let j = 0; j < ids.length; j++){
+                str += (str ? ',' : '') + (type === "string" ? '"' + ids[j] + '"' : ids[j]);
+            }
+            str = '[' + str + ']';
+            res += (res ? ',' : '') + str;
+        }
+        res = '["' + key + '",[' + res + ']]';
+        map += (map ? ',' : '') + res;
+    }
+    map = "index.map=new Map([" + map + "]);";
+
+    let ctx = '';
+    for(const context of this.ctx.entries()){
+        const key_ctx = context[0];
+        const value_ctx = context[1];
+
+        for(const item of value_ctx.entries()){
+            const key = item[0];
+            const value = item[1];
+
+            let res = '';
+            for(let i = 0, ids; i < value.length; i++){
+                ids = value[i] || [''];
+                let str = '';
+                for(let j = 0; j < ids.length; j++){
+                    str += (str ? ',' : '') + (type === "string" ? '"' + ids[j] + '"' : ids[j]);
+                }
+                str = '[' + str + ']';
+                res += (res ? ',' : '') + str;
+            }
+            res = 'new Map([["' + key + '",[' + res + ']]])';
+            res = '["' + key_ctx + '",' + res + ']';
+            ctx += (ctx ? ',' : '') +  res;
+        }
+    }
+    ctx = "index.ctx=new Map([" + ctx + "]);";
+
+    return withFunctionWrapper
+        ? "function inject(index){" + reg + map + ctx + "}"
+        : reg + map + ctx
+}
+
+// export function exportSnapshot(flexsearch){
+//
+//     if(!flexsearch.reg.size) return;
+//
+//     let reg = '';
+//     let type = "";
+//     for(const key of flexsearch.reg.keys()){
+//         type || (type = typeof key);
+//         reg += (reg ? ',' : '') + (type === "string" ? '"' + key + '"' : key);
+//     }
+//     reg = "f.reg=[" + reg + "];";
+//
+//     let map = '';
+//     for(const item of flexsearch.map.entries()){
+//         const key = item[0];
+//         const value = item[1];
+//         let res = '';
+//         for(let i = 0, ids; i < value.length; i++){
+//             ids = value[i] || [''];
+//             let str = '';
+//             for(let j = 0; j < ids.length; j++){
+//                 str += (str ? ',' : '') + (type === "string" ? '"' + ids[j] + '"' : ids[j]);
+//             }
+//             str = "[
+//             res += (res ? '|' : '') + str;
+//         }
+//         map += (map ? ';' : '') + key + ':' + res;
+//     }
+//
+//
+//     let ctx = '';
+//     for(const context of flexsearch.ctx.entries()){
+//         const key_ctx = context[0];
+//         const value_ctx = context[1];
+//
+//         for(const item of value_ctx.entries()){
+//             const key = item[0];
+//             const value = item[1];
+//
+//             let res = '';
+//             for(let i = 0, ids; i < value.length; i++){
+//                 ids = value[i] || [''];
+//                 let str = '';
+//                 for(let j = 0; j < ids.length; j++){
+//                     str += (str ? ',' : '') + (type === "string" ? '"' + ids[j] + '"' : ids[j]);
+//                 }
+//                 res += (res ? '|' : '') + str;
+//             }
+//             ctx += (ctx ? ';' : '') + key_ctx + '+' + key + ':' + res;
+//         }
+//     }
+//
+//     return reg + '#' + map + '#' + ctx;
+// }
+//
+// export function importSnapshot(flexsearch, input){
+//
+//     if(!input) return;
+//
+//     let pos_reg = input.indexOf("#");
+//     const reg = input.substring(0, pos_reg).split(",");
+//     flexsearch.reg = new Set(reg);
+//
+//     let pos_map = input.indexOf("#", pos_reg + 1);
+//     const map = input.substring(pos_reg + 1, pos_map).split(";").map(res => {
+//         const split = res.split(":");
+//         split[1] = split[1].split("|").map(ids => ids ? ids.split(",") : null);
+//         return split;
+//     });
+//     flexsearch.map = new Map(map);
+//
+//     input = input.substring(pos_map + 1);
+//     if(input){
+//         const ctx = input.split(";").map(res => {
+//             const split = res.split(":");
+//             const context = split[0].split("+");
+//             const map = new Map([
+//                 [context[1], split[1].split("|").map(ids => ids ? ids.split(",") : null)]
+//             ]);
+//             return [context[0], map]
+//         });
+//         flexsearch.ctx = new Map(ctx);
+//     }
+// }
diff --git a/src/webpack.js b/src/webpack.js
index 0255f2c..60e510b 100644
--- a/src/webpack.js
+++ b/src/webpack.js
@@ -6,7 +6,8 @@ import {
     SUPPORT_ENCODER,
     SUPPORT_CHARSET,
     SUPPORT_PERSISTENT,
-    SUPPORT_RESOLVER
+    SUPPORT_RESOLVER,
+    SUPPORT_SERIALIZE
 } from "./config.js";
 // <-- COMPILER BLOCK
 import {
@@ -46,10 +47,17 @@ import Charset from "./charset.js";
 /** @export */ Index.prototype.removeAsync;
 /** @export */ Index.prototype.export;
 /** @export */ Index.prototype.import;
+/** @export */ Index.prototype.serialize;
 /** @export */ Index.prototype.mount;
 /** @export */ Index.prototype.commit;
 /** @export */ Index.db;
 
+if(SUPPORT_SERIALIZE){
+/** @export */ Index.prototype.reg;
+/** @export */ Index.prototype.map;
+/** @export */ Index.prototype.ctx;
+}
+
 /** @export */ Document.prototype.add;
 /** @export */ Document.prototype.append;
 /** @export */ Document.prototype.search;