diff --git a/README.md b/README.md
index 1a09421..7f83ea7 100644
--- a/README.md
+++ b/README.md
@@ -2269,6 +2269,56 @@ The custom build will be saved to `dist/flexsearch.custom.xxxx.min.js` or when f
 
 A formula to determine a well-balanced value for the `resolution` is: $2*floor(\sqrt{content.length})$ where content is the value pushed by `index.add()`. Here the maximum length of all contents should be used.
 
+## Import / Export (In-Memory)
+
+> Persistent-Indexes and Worker-Indexes don't support Import/Export.
+
+Export a simple `Index` to the folder `/export/`:
+
+```js
+import { promises as fs } from "fs";
+
+await index.export(async function(key, data){
+  await fs.writeFile("./export/" + key, data, "utf8");
+});
+```
+
+Import from folder `/export/` into a simple `Index`:
+
+```js
+const index = new Index({/* keep old config and place it here */});
+
+const files = await fs.readdir("./export/");
+for(let i = 0; i < files.length; i++){
+  const data = await fs.readFile("./export/" + files[i], "utf8");
+  await index.import(files[i], data);
+}
+```
+
+This is very similar for document indexes.
+
+Export a `Document-Index` to the folder `/export/`:
+
+```js
+import { promises as fs } from "fs";
+
+await index.export(async function(key, data){
+  await fs.writeFile("./export/" + key, data, "utf8");
+});
+```
+
+Import from folder `/export/` into a `Document-Index`:
+
+```js
+const index = new Document({/* keep old config and place it here */});
+
+const files = await fs.readdir("./export/");
+for(let i = 0; i < files.length; i++){
+  const data = await fs.readFile("./export/" + files[i], "utf8");
+  await index.import(files[i], data);
+}
+```
+
 ## Migration
 
 - The index option property "minlength" has moved to the Encoder Class
diff --git a/dist/db/indexeddb/index.cjs b/dist/db/indexeddb/index.cjs
index 34fedc3..fde7f8f 100644
--- a/dist/db/indexeddb/index.cjs
+++ b/dist/db/indexeddb/index.cjs
@@ -430,7 +430,7 @@ const normalize = "".normalize && /[\u0300-\u036f]/g; // '´`’ʼ.,
 
 function Encoder(options){
 
-    if(!this){
+    if(this.constructor !== Encoder){
         return new Encoder(...arguments);
     }
 
@@ -1009,7 +1009,7 @@ let pid = 0;
 
 function WorkerIndex(options = {}){
 
-    if(!this) {
+    if(this.constructor !== WorkerIndex) {
         return new WorkerIndex(options);
     }
 
@@ -1245,111 +1245,88 @@ function register(key){
     };
 }
 
-// TODO return promises instead of inner await
+function map_to_json(map){
+    const json = [];
+    for(const item of map.entries()){
+        json.push(item);
+    }
+    return json;
+}
 
+function ctx_to_json(ctx){
+    const json = [];
+    for(const item of ctx.entries()){
+        json.push(map_to_json(item));
+    }
+    return json;
+}
 
-function async(callback, self, field, key, index_doc, index, data, on_done){
+function reg_to_json(reg){
+    const json = [];
+    for(const key of reg.keys()){
+        json.push(key);
+    }
+    return json;
+}
 
-    //setTimeout(function(){
+function save(callback, field, key, index_doc, index, data){
 
-        const res = callback(field ? field + "." + key : key, JSON.stringify(data));
+    const res = callback(field ? field + "." + key : key, JSON.stringify(data));
 
-        // await isn't supported by ES5
+    if(res && res["then"]){
+        const self = this;
+        return res["then"](function(){
+            return self.export(callback, field, index_doc, index + 1);
+        });
+    }
 
-        if(res && res["then"]){
-
-            res["then"](function(){
-
-                self.export(callback, self, field, index_doc, index + 1, on_done);
-            });
-        }
-        else {
-
-            self.export(callback, self, field, index_doc, index + 1, on_done);
-        }
-    //});
+    return this.export(callback, field, index_doc, index + 1);
 }
 
 /**
  * @param callback
- * @param self
  * @param field
  * @param index_doc
  * @param index
- * @param on_done
  * @this {Index|Document}
  */
 
-function exportIndex(callback, self, field, index_doc, index, on_done){
-
-    let return_value = true;
-    if (typeof on_done === 'undefined') {
-        return_value = new Promise((resolve) => {
-            on_done = resolve;
-        });
-    }
+function exportIndex(callback, field, index_doc, index = 0){
 
     let key, data;
 
-    switch(index || (index = 0)){
+    switch(index){
 
         case 0:
 
             key = "reg";
-
-            // fastupdate isn't supported by export
-
-            if(this.fastupdate){
-
-                data = create_object();
-
-                for(let key of this.reg.keys()){
-
-                    data[key] = 1;
-                }
-            }
-            else {
-
-                data = this.reg;
-            }
-
+            data = reg_to_json(this.reg);
             break;
 
         case 1:
 
             key = "cfg";
-            data = {
-                "doc": 0,
-                "opt": this.optimize ? 1 : 0
-            };
-
+            data = {};
             break;
 
         case 2:
 
             key = "map";
-            data = this.map;
+            data = map_to_json(this.map);
             break;
 
         case 3:
 
             key = "ctx";
-            data = this.ctx;
+            data = ctx_to_json(this.ctx);
             break;
 
         default:
 
-            if (typeof field === 'undefined' && on_done) {
-
-                on_done();
-            }
-
             return;
     }
 
-    async(callback, self || this, field, key, index_doc, index, data, on_done);
-
-    return return_value;
+    return save.call(this, callback, field, key, index_doc, index, data);
 }
 
 /**
@@ -1359,38 +1336,32 @@ function exportIndex(callback, self, field, index_doc, index, on_done){
 function importIndex(key, data){
 
     if(!data){
-
         return;
     }
-
     if(is_string(data)){
-
         data = JSON.parse(data);
     }
 
     switch(key){
 
         case "cfg":
-
-            this.optimize = !!data["opt"];
             break;
 
         case "reg":
 
-            // fastupdate isn't supported by import
-
+            // fast update isn't supported by export/import
             this.fastupdate = false;
-            this.reg = data;
+            this.reg = new Set(data);
             break;
 
         case "map":
 
-            this.map = data;
+            this.map = new Map(data);
             break;
 
         case "ctx":
 
-            this.ctx = data;
+            this.ctx = new Map(data);
             break;
     }
 }
@@ -1399,35 +1370,23 @@ function importIndex(key, data){
  * @this Document
  */
 
-function exportDocument(callback, self, field, index_doc, index, on_done){
-
-    let return_value;
-    if (typeof on_done === 'undefined') {
-        return_value = new Promise((resolve) => {
-            on_done = resolve;
-        });
-    }
-
-    index || (index = 0);
-    index_doc || (index_doc = 0);
+function exportDocument(callback, field, index_doc = 0, index = 0){
 
     if(index_doc < this.field.length){
 
         const field = this.field[index_doc];
-        const idx = this.index[field];
+        const idx = this.index.get(field);
+        // start from index 1, because document indexes does not additionally store register
+        const res = idx.export(callback, field, index_doc, index = 1);
 
-        self = this;
+        if(res && res["then"]){
+            const self = this;
+            return res["then"](function(){
+                return self.export(callback, field, index_doc + 1, index = 0);
+            });
+        }
 
-        //setTimeout(function(){
-
-            if(!idx.export(callback, self, index ? field/*.replace(":", "-")*/ : "", index_doc, index++, on_done)){
-
-                index_doc++;
-                index = 1;
-
-                self.export(callback, self, field, index_doc, index, on_done);
-            }
-        //});
+        return this.export(callback, field, index_doc + 1, index = 0);
     }
     else {
 
@@ -1435,36 +1394,41 @@ function exportDocument(callback, self, field, index_doc, index, on_done){
 
         switch(index){
 
+            case 0:
+
+                key = "reg";
+                data = reg_to_json(this.reg);
+                field = null;
+                break;
+
             case 1:
 
                 key = "tag";
-                data = this.tagindex;
+                data = ctx_to_json(this.tag);
                 field = null;
                 break;
 
             case 2:
 
-                key = "store";
-                data = this.store;
+                key = "doc";
+                data = map_to_json(this.store);
                 field = null;
                 break;
 
-            // case 3:
-            //
-            //     key = "reg";
-            //     data = this.register;
-            //     break;
+            case 3:
+
+                key = "cfg";
+                data = {};
+                field = null;
+                break;
 
             default:
 
-                on_done();
                 return;
         }
 
-        async(callback, this, field, key, index_doc, index, data, on_done);
+        return save.call(this, callback, field, key, index_doc, index, data);
     }
-    
-    return return_value
 }
 
 /**
@@ -1474,12 +1438,9 @@ function exportDocument(callback, self, field, index_doc, index, on_done){
 function importDocument(key, data){
 
     if(!data){
-
         return;
     }
-
     if(is_string(data)){
-
         data = JSON.parse(data);
     }
 
@@ -1487,28 +1448,26 @@ function importDocument(key, data){
 
         case "tag":
 
-            this.tagindex = data;
+            this.tagindex = new Map(data);
             break;
 
         case "reg":
 
-            // fastupdate isn't supported by import
-
+            // fast update isn't supported by export/import
             this.fastupdate = false;
-            this.reg = data;
+            this.reg = new Set(data);
 
-            for(let i = 0, index; i < this.field.length; i++){
-
-                index = this.index[this.field[i]];
-                index.reg = data;
-                index.fastupdate = false;
+            for(let i = 0, idx; i < this.field.length; i++){
+                idx = this.index.get(this.field[i]);
+                idx.fastupdate = false;
+                idx.reg = this.reg;
             }
 
             break;
 
-        case "store":
+        case "doc":
 
-            this.store = data;
+            this.store = new Map(data);
             break;
 
         default:
@@ -1518,8 +1477,7 @@ function importDocument(key, data){
             key = key[1];
 
             if(field && key){
-
-                this.index[field].import(key, data);
+                this.index.get(field).import(key, data);
             }
     }
 }
@@ -3492,7 +3450,7 @@ function apply_enrich(res){
 
 function Document(options){
 
-    if(!this) {
+    if(this.constructor !== Document) {
         return new Document(options);
     }
 
@@ -5472,7 +5430,7 @@ function exclusion(result, limit, offset, resolve){
  */
 
 function Resolver(result){
-    if(!this){
+    if(this.constructor !== Resolver){
         return new Resolver(result);
     }
     if(result && result.index){
@@ -6232,7 +6190,7 @@ function remove_index(map, id){
 
 function Index(options, _register){
 
-    if(!this){
+    if(this.constructor !== Index){
         return new Index(options);
     }
 
diff --git a/dist/flexsearch.bundle.debug.js b/dist/flexsearch.bundle.debug.js
index f12796d..2e90e31 100644
--- a/dist/flexsearch.bundle.debug.js
+++ b/dist/flexsearch.bundle.debug.js
@@ -90,7 +90,7 @@ function ca(a) {
 "\u04d9"], ["\u04dd", "\u0436"], ["\u04df", "\u0437"], ["\u04e3", "\u0438"], ["\u04e5", "\u0438"], ["\u04e7", "\u043e"], ["\u04eb", "\u04e9"], ["\u04ed", "\u044d"], ["\u04ef", "\u0443"], ["\u04f1", "\u0443"], ["\u04f3", "\u0443"], ["\u04f5", "\u0447"]];
 const ea = /[^\p{L}\p{N}]+/u, fa = /(\d{3})/g, ha = /(\D)(\d{3})/g, ia = /(\d{3})(\D)/g, ja = "".normalize && /[\u0300-\u036f]/g;
 function K(a) {
-  if (!this) {
+  if (this.constructor !== K) {
     return new K(...arguments);
   }
   for (let b = 0; b < arguments.length; b++) {
@@ -264,7 +264,7 @@ function N(a = {}) {
       return this;
     }
   }
-  if (!this) {
+  if (this.constructor !== N) {
     return new N(a);
   }
   let c = "undefined" !== typeof self ? self._factory : "undefined" !== typeof window ? window._factory : null;
@@ -314,12 +314,37 @@ function P(a) {
     return b;
   };
 }
-;function oa(a, b, c, d, e, f, g, h) {
-  (d = a(c ? c + "." + d : d, JSON.stringify(g))) && d.then ? d.then(function() {
-    b.export(a, b, c, e, f + 1, h);
-  }) : b.export(a, b, c, e, f + 1, h);
+;function oa(a) {
+  const b = [];
+  for (const c of a.entries()) {
+    b.push(c);
+  }
+  return b;
 }
-;function pa(a, b, c, d) {
+function pa(a) {
+  const b = [];
+  for (const c of a.entries()) {
+    b.push(oa(c));
+  }
+  return b;
+}
+function qa(a) {
+  const b = [];
+  for (const c of a.keys()) {
+    b.push(c);
+  }
+  return b;
+}
+function ra(a, b, c, d, e, f) {
+  if ((c = a(b ? b + "." + c : c, JSON.stringify(f))) && c.then) {
+    const g = this;
+    return c.then(function() {
+      return g.export(a, b, d, e + 1);
+    });
+  }
+  return this.export(a, b, d, e + 1);
+}
+;function sa(a, b, c, d) {
   let e = [];
   for (let f = 0, g; f < a.index.length; f++) {
     if (g = a.index[f], b >= g.length) {
@@ -385,12 +410,12 @@ function Q(a) {
     }
     if ("slice" === d) {
       return function(e, f) {
-        return pa(b, e || 0, f || b.length, !1);
+        return sa(b, e || 0, f || b.length, !1);
       };
     }
     if ("splice" === d) {
       return function(e, f) {
-        return pa(b, e || 0, f || b.length, !0);
+        return sa(b, e || 0, f || b.length, !0);
       };
     }
     if ("constructor" === d) {
@@ -421,7 +446,7 @@ function R(a = 8) {
   this.index = B();
   this.B = [];
   this.size = 0;
-  32 < a ? (this.h = qa, this.A = BigInt(a)) : (this.h = ra, this.A = a);
+  32 < a ? (this.h = ta, this.A = BigInt(a)) : (this.h = ua, this.A = a);
 }
 R.prototype.get = function(a) {
   const b = this.index[this.h(a)];
@@ -438,7 +463,7 @@ function S(a = 8) {
   }
   this.index = B();
   this.h = [];
-  32 < a ? (this.B = qa, this.A = BigInt(a)) : (this.B = ra, this.A = a);
+  32 < a ? (this.B = ta, this.A = BigInt(a)) : (this.B = ua, this.A = a);
 }
 S.prototype.add = function(a) {
   var b = this.B(a);
@@ -480,7 +505,7 @@ v.entries = S.prototype.entries = function*() {
     }
   }
 };
-function ra(a) {
+function ua(a) {
   let b = 2 ** this.A - 1;
   if ("number" == typeof a) {
     return a & b;
@@ -491,7 +516,7 @@ function ra(a) {
   }
   return 32 === this.A ? c + 2 ** 31 : c;
 }
-function qa(a) {
+function ta(a) {
   let b = BigInt(2) ** this.A - BigInt(1);
   var c = typeof a;
   if ("bigint" === c) {
@@ -521,7 +546,7 @@ function qa(a) {
         e && d.add(a, e, !1, !0);
       } else {
         if (e = k.I, !e || e(b)) {
-          k.constructor === String ? k = ["" + k] : G(k) && (k = [k]), sa(b, k, this.K, 0, d, a, k[0], c);
+          k.constructor === String ? k = ["" + k] : G(k) && (k = [k]), va(b, k, this.K, 0, d, a, k[0], c);
         }
       }
     }
@@ -584,7 +609,7 @@ function qa(a) {
             h[l] = b[l];
             continue;
           }
-          ta(b, h, l, 0, l[0], m);
+          wa(b, h, l, 0, l[0], m);
         }
       }
       this.store.set(a, h || b);
@@ -592,21 +617,21 @@ function qa(a) {
   }
   return this;
 };
-function ta(a, b, c, d, e, f) {
+function wa(a, b, c, d, e, f) {
   a = a[e];
   if (d === c.length - 1) {
     b[e] = f || a;
   } else if (a) {
     if (a.constructor === Array) {
       for (b = b[e] = Array(a.length), e = 0; e < a.length; e++) {
-        ta(a, b, c, d, e);
+        wa(a, b, c, d, e);
       }
     } else {
-      b = b[e] || (b[e] = B()), e = c[++d], ta(a, b, c, d, e);
+      b = b[e] || (b[e] = B()), e = c[++d], wa(a, b, c, d, e);
     }
   }
 }
-function sa(a, b, c, d, e, f, g, h) {
+function va(a, b, c, d, e, f, g, h) {
   if (a = a[g]) {
     if (d === b.length - 1) {
       if (a.constructor === Array) {
@@ -622,17 +647,17 @@ function sa(a, b, c, d, e, f, g, h) {
     } else {
       if (a.constructor === Array) {
         for (g = 0; g < a.length; g++) {
-          sa(a, b, c, d, e, f, g, h);
+          va(a, b, c, d, e, f, g, h);
         }
       } else {
-        g = b[++d], sa(a, b, c, d, e, f, g, h);
+        g = b[++d], va(a, b, c, d, e, f, g, h);
       }
     }
   } else {
     e.db && e.remove(f);
   }
 }
-;function ua(a, b, c, d, e, f, g) {
+;function xa(a, b, c, d, e, f, g) {
   const h = a.length;
   let k = [], l;
   var m;
@@ -648,7 +673,7 @@ function sa(a, b, c, d, e, f, g, h) {
   }
   if (a = k.length) {
     if (e) {
-      k = 1 < k.length ? va(k, d, c, g, 0) : (k = k[0]).length > c || d ? k.slice(d, c + d) : k;
+      k = 1 < k.length ? ya(k, d, c, g, 0) : (k = k[0]).length > c || d ? k.slice(d, c + d) : k;
     } else {
       if (a < h) {
         return [];
@@ -681,7 +706,7 @@ function sa(a, b, c, d, e, f, g, h) {
   }
   return k;
 }
-function va(a, b, c, d, e) {
+function ya(a, b, c, d, e) {
   const f = [], g = B();
   let h;
   var k = a.length;
@@ -724,7 +749,7 @@ function va(a, b, c, d, e) {
   }
   return f;
 }
-function wa(a, b) {
+function za(a, b) {
   const c = B(), d = [];
   for (let e = 0, f; e < b.length; e++) {
     f = b[e];
@@ -802,7 +827,7 @@ function wa(a, b) {
               }
               t.push(d = d.db.tag(r[n + 1], b, l, q));
             } else {
-              d = xa.call(this, r[n], r[n + 1], b, l, q);
+              d = Aa.call(this, r[n], r[n + 1], b, l, q);
             }
             e.push({field:r[n], tag:r[n + 1], result:d});
           }
@@ -854,7 +879,7 @@ function wa(a, b) {
           }
         }
       } else {
-        for (let E = 0, F, cb; E < n.length; E += 2) {
+        for (let E = 0, F, fb; E < n.length; E += 2) {
           F = this.tag.get(n[E]);
           if (!F) {
             if (console.warn("Tag '" + n[E] + ":" + n[E + 1] + "' will be skipped because there is no field '" + n[E] + "'."), t) {
@@ -863,7 +888,7 @@ function wa(a, b) {
               return e;
             }
           }
-          if (cb = (F = F && F.get(n[E + 1])) && F.length) {
+          if (fb = (F = F && F.get(n[E + 1])) && F.length) {
             x++, u.push(F);
           } else if (!t) {
             return e;
@@ -871,7 +896,7 @@ function wa(a, b) {
         }
       }
       if (x) {
-        w = wa(w, u);
+        w = za(w, u);
         I = w.length;
         if (!I && !t) {
           return e;
@@ -913,7 +938,7 @@ function wa(a, b) {
   r = [];
   for (let y = 0, w; y < f.length; y++) {
     w = e[y];
-    q && w.length && !w[0].doc && (this.db ? r.push(w = this.index.get(this.field[0]).db.enrich(w)) : w.length && (w = ya.call(this, w)));
+    q && w.length && !w[0].doc && (this.db ? r.push(w = this.index.get(this.field[0]).db.enrich(w)) : w.length && (w = Ba.call(this, w)));
     if (g) {
       return w;
     }
@@ -925,12 +950,12 @@ function wa(a, b) {
       for (let A = 0; A < w.length; A++) {
         e[A].result = w[A];
       }
-      return h ? za(e, b) : p ? Aa(e, a, y.index, y.field, y.D, p) : e;
+      return h ? Ca(e, b) : p ? Da(e, a, y.index, y.field, y.D, p) : e;
     });
   }
-  return h ? za(e, b) : p ? Aa(e, a, this.index, this.field, this.D, p) : e;
+  return h ? Ca(e, b) : p ? Da(e, a, this.index, this.field, this.D, p) : e;
 };
-function Aa(a, b, c, d, e, f) {
+function Da(a, b, c, d, e, f) {
   let g, h, k;
   for (let m = 0, p, n, q, t, r; m < a.length; m++) {
     p = a[m].result;
@@ -972,7 +997,7 @@ function Aa(a, b, c, d, e, f) {
   }
   return a;
 }
-function za(a, b) {
+function Ca(a, b) {
   const c = [], d = B();
   for (let e = 0, f, g; e < a.length; e++) {
     f = a[e];
@@ -991,7 +1016,7 @@ function za(a, b) {
   }
   return c;
 }
-function xa(a, b, c, d, e) {
+function Aa(a, b, c, d, e) {
   let f = this.tag.get(a);
   if (!f) {
     return console.warn("Tag '" + a + "' was not found"), [];
@@ -1000,11 +1025,11 @@ function xa(a, b, c, d, e) {
     if (a > c || d) {
       f = f.slice(d, d + c);
     }
-    e && (f = ya.call(this, f));
+    e && (f = Ba.call(this, f));
     return f;
   }
 }
-function ya(a) {
+function Ba(a) {
   const b = Array(a.length);
   for (let c = 0, d; c < a.length; c++) {
     d = a[c], b[c] = {id:d, doc:this.store.get(d)};
@@ -1012,7 +1037,7 @@ function ya(a) {
   return b;
 }
 ;function T(a) {
-  if (!this) {
+  if (this.constructor !== T) {
     return new T(a);
   }
   const b = a.document || a.doc || a;
@@ -1020,7 +1045,7 @@ function ya(a) {
   this.D = [];
   this.field = [];
   this.K = [];
-  this.key = (c = b.key || b.id) && Ba(c, this.K) || "id";
+  this.key = (c = b.key || b.id) && Ea(c, this.K) || "id";
   (d = a.keystore || 0) && (this.keystore = d);
   this.reg = (this.fastupdate = !!a.fastupdate) ? d ? new R(d) : new Map() : d ? new S(d) : new Set();
   this.C = (c = b.store || null) && !0 !== c && [];
@@ -1028,7 +1053,7 @@ function ya(a) {
   this.cache = (c = a.cache || null) && new U(c);
   a.cache = !1;
   this.worker = a.worker;
-  this.index = Ca.call(this, a, b);
+  this.index = Fa.call(this, a, b);
   this.tag = null;
   if (c = b.tag) {
     if ("string" === typeof c && (c = [c]), c.length) {
@@ -1041,7 +1066,7 @@ function ya(a) {
         if (!g) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
-        f.custom ? this.G[e] = f.custom : (this.G[e] = Ba(g, this.K), f.filter && ("string" === typeof this.G[e] && (this.G[e] = new String(this.G[e])), this.G[e].I = f.filter));
+        f.custom ? this.G[e] = f.custom : (this.G[e] = Ea(g, this.K), f.filter && ("string" === typeof this.G[e] && (this.G[e] = new String(this.G[e])), this.G[e].I = f.filter));
         this.N[e] = g;
         this.tag.set(g, new Map());
       }
@@ -1109,7 +1134,7 @@ v.destroy = function() {
   }
   return Promise.all(a);
 };
-function Ca(a, b) {
+function Fa(a, b) {
   const c = new Map();
   let d = b.index || b.field || b;
   G(d) && (d = [d]);
@@ -1122,19 +1147,19 @@ function Ca(a, b) {
       c.set(f, h);
     }
     this.worker || c.set(f, new L(g, this.reg));
-    g.custom ? this.D[e] = g.custom : (this.D[e] = Ba(f, this.K), g.filter && ("string" === typeof this.D[e] && (this.D[e] = new String(this.D[e])), this.D[e].I = g.filter));
+    g.custom ? this.D[e] = g.custom : (this.D[e] = Ea(f, this.K), g.filter && ("string" === typeof this.D[e] && (this.D[e] = new String(this.D[e])), this.D[e].I = g.filter));
     this.field[e] = f;
   }
   if (this.C) {
     a = b.store;
     G(a) && (a = [a]);
     for (let e = 0, f, g; e < a.length; e++) {
-      f = a[e], g = f.field || f, f.custom ? (this.C[e] = f.custom, f.custom.U = g) : (this.C[e] = Ba(g, this.K), f.filter && ("string" === typeof this.C[e] && (this.C[e] = new String(this.C[e])), this.C[e].I = f.filter));
+      f = a[e], g = f.field || f, f.custom ? (this.C[e] = f.custom, f.custom.U = g) : (this.C[e] = Ea(g, this.K), f.filter && ("string" === typeof this.C[e] && (this.C[e] = new String(this.C[e])), this.C[e].I = f.filter));
     }
   }
   return c;
 }
-function Ba(a, b) {
+function Ea(a, b) {
   const c = a.split(":");
   let d = 0;
   for (let e = 0; e < c.length; e++) {
@@ -1200,65 +1225,70 @@ v.set = function(a, b) {
   this.store.set(a, b);
   return this;
 };
-v.searchCache = Da;
-v.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.A;
-        c = null;
-        break;
-      case 2:
-        b = "store";
-        h = this.store;
-        c = null;
-        break;
-      default:
-        f();
-        return;
+v.searchCache = Ga;
+v.export = function(a, b, c = 0, d = 0) {
+  if (c < this.field.length) {
+    const g = this.field[c];
+    if ((b = this.index.get(g).export(a, g, c, d = 1)) && b.then) {
+      const h = this;
+      return b.then(function() {
+        return h.export(a, g, c + 1, d = 0);
+      });
     }
-    oa(a, this, c, b, d, e, h, f);
+    return this.export(a, g, c + 1, d = 0);
   }
-  return g;
+  let e, f;
+  switch(d) {
+    case 0:
+      e = "reg";
+      f = qa(this.reg);
+      b = null;
+      break;
+    case 1:
+      e = "tag";
+      f = pa(this.tag);
+      b = null;
+      break;
+    case 2:
+      e = "doc";
+      f = oa(this.store);
+      b = null;
+      break;
+    case 3:
+      e = "cfg";
+      f = {};
+      b = null;
+      break;
+    default:
+      return;
+  }
+  return ra.call(this, a, b, e, c, d, f);
 };
 v.import = function(a, b) {
   if (b) {
     switch(G(b) && (b = JSON.parse(b)), a) {
       case "tag":
-        this.A = b;
         break;
       case "reg":
         this.fastupdate = !1;
-        this.reg = b;
+        this.reg = new Set(b);
         for (let d = 0, e; d < this.field.length; d++) {
-          e = this.index[this.field[d]], e.reg = b, e.fastupdate = !1;
+          e = this.index.get(this.field[d]), e.fastupdate = !1, e.reg = this.reg;
         }
         break;
-      case "store":
-        this.store = b;
+      case "doc":
+        this.store = new Map(b);
         break;
       default:
         a = a.split(".");
         const c = a[0];
         a = a[1];
-        c && a && this.index[c].import(a, b);
+        c && a && this.index.get(c).import(a, b);
     }
   }
 };
 na(T.prototype);
-function Da(a, b, c) {
+function Ga(a, b, c) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
   let d = this.cache.get(a);
   if (!d) {
@@ -1298,31 +1328,31 @@ U.prototype.clear = function() {
   this.cache.clear();
   this.h = "";
 };
-const Ea = {normalize:function(a) {
+const Ha = {normalize:function(a) {
   return a.toLowerCase();
 }, dedupe:!1};
-const Fa = 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 Ga = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), Ha = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
-const Ia = {a:"", e:"", i:"", o:"", u:"", y:"", b:1, f:1, p:1, v:1, c:2, g:2, j:2, k:2, q:2, s:2, x:2, z:2, "\u00df":2, d:3, t:3, l:4, m:5, n:5, r:6};
-const Ja = /[\x00-\x7F]+/g;
-const Ka = /[\x00-\x7F]+/g;
-const La = /[\x00-\x7F]+/g;
-var Ma = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:Ea, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:Fa}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:Fa, matcher:Ga, replacer:Ha}, LatinExtra:{normalize:!0, dedupe:!0, mapper:Fa, replacer:Ha.concat([/(?!^)[aeo]/g, ""]), matcher:Ga}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
+const Ia = 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 Ja = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), Ka = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
+const La = {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 Ma = /[\x00-\x7F]+/g;
+const Na = /[\x00-\x7F]+/g;
+const Oa = /[\x00-\x7F]+/g;
+var Pa = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:Ha, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:Ia}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:Ia, matcher:Ja, replacer:Ka}, LatinExtra:{normalize:!0, dedupe:!0, mapper:Ia, replacer:Ka.concat([/(?!^)[aeo]/g, ""]), matcher:Ja}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
   for (let c = 0; c < a.length; c++) {
     var b = a[c];
-    let d = b.charAt(0), e = Ia[d];
-    for (let f = 1, g; f < b.length && (g = b.charAt(f), "h" === g || "w" === g || !(g = Ia[g]) || g === e || (d += g, e = g, 4 !== d.length)); f++) {
+    let d = b.charAt(0), e = La[d];
+    for (let f = 1, g; f < b.length && (g = b.charAt(f), "h" === g || "w" === g || !(g = La[g]) || g === e || (d += g, e = g, 4 !== d.length)); f++) {
     }
     a[c] = d;
   }
 }}, ArabicDefault:{rtl:!0, normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(Ja, " ");
+  return ("" + a).replace(Ma, " ");
 }}, CjkDefault:{normalize:!1, dedupe:!0, split:"", prepare:function(a) {
-  return ("" + a).replace(Ka, "");
+  return ("" + a).replace(Na, "");
 }}, CyrillicDefault:{normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(La, " ");
+  return ("" + a).replace(Oa, " ");
 }}};
-const Na = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
+const Qa = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
 B();
 L.prototype.add = function(a, b, c, d) {
   if (b && (a || 0 === a)) {
@@ -1336,14 +1366,14 @@ L.prototype.add = function(a, b, c, d) {
         let t = b[this.rtl ? d - 1 - q : q];
         var e = t.length;
         if (e && (p || !m[t])) {
-          var f = this.score ? this.score(b, t, q, null, 0) : Oa(n, d, q), g = "";
+          var f = this.score ? this.score(b, t, q, null, 0) : Ra(n, d, q), g = "";
           switch(this.tokenize) {
             case "full":
               if (2 < e) {
                 for (f = 0; f < e; f++) {
                   for (var h = e; h > f; h--) {
                     g = t.substring(f, h);
-                    var k = this.score ? this.score(b, t, q, g, f) : Oa(n, d, q, e, f);
+                    var k = this.score ? this.score(b, t, q, g, f) : Ra(n, d, q, e, f);
                     V(this, m, g, k, a, c);
                   }
                 }
@@ -1352,7 +1382,7 @@ L.prototype.add = function(a, b, c, d) {
             case "reverse":
               if (1 < e) {
                 for (h = e - 1; 0 < h; h--) {
-                  g = t[h] + g, k = this.score ? this.score(b, t, q, g, h) : Oa(n, d, q, e, h), V(this, m, g, k, a, c);
+                  g = t[h] + g, k = this.score ? this.score(b, t, q, g, h) : Ra(n, d, q, e, h), V(this, m, g, k, a, c);
                 }
                 g = "";
               }
@@ -1368,7 +1398,7 @@ L.prototype.add = function(a, b, c, d) {
                 for (e = B(), g = this.R, f = t, h = Math.min(p + 1, d - q), e[f] = 1, k = 1; k < h; k++) {
                   if ((t = b[this.rtl ? d - 1 - q - k : q + k]) && !e[t]) {
                     e[t] = 1;
-                    const r = this.score ? this.score(b, f, q, t, k) : Oa(g + (d / 2 > g ? 0 : 1), d, q, h - 1, k - 1), u = this.bidirectional && t > f;
+                    const r = this.score ? this.score(b, f, q, t, k) : Ra(g + (d / 2 > g ? 0 : 1), d, q, h - 1, k - 1), u = this.bidirectional && t > f;
                     V(this, l, u ? f : t, r, a, c, u ? t : f);
                   }
                 }
@@ -1381,7 +1411,7 @@ L.prototype.add = function(a, b, c, d) {
       b = "";
     }
   }
-  this.db && (b || this.commit_task.push({del:a}), this.T && Pa(this));
+  this.db && (b || this.commit_task.push({del:a}), this.T && Sa(this));
   return this;
 };
 function V(a, b, c, d, e, f, g) {
@@ -1402,12 +1432,12 @@ function V(a, b, c, d, e, f, g) {
     }
   }
 }
-function Oa(a, b, c, d, e) {
+function Ra(a, b, c, d, e) {
   return c && 1 < a ? b + (d || 0) <= a ? c + (e || 0) : (a - 1) / (b + (d || 0)) * (c + (e || 0)) + 1 | 0 : 0;
 }
 ;function W(a, b, c, d) {
   if (1 === a.length) {
-    return a = a[0], a = c || a.length > b ? b ? a.slice(c, c + b) : a.slice(c) : a, d ? Qa(a) : a;
+    return a = a[0], a = c || a.length > b ? b ? a.slice(c, c + b) : a.slice(c) : a, d ? Ta(a) : a;
   }
   let e = [];
   for (let f = 0, g, h; f < a.length; f++) {
@@ -1423,7 +1453,7 @@ function Oa(a, b, c, d, e) {
         h > b && (g = g.slice(0, b), h = g.length), e.push(g);
       } else {
         if (h >= b) {
-          return h > b && (g = g.slice(0, b)), d ? Qa(g) : g;
+          return h > b && (g = g.slice(0, b)), d ? Ta(g) : g;
         }
         e = [g];
       }
@@ -1437,9 +1467,9 @@ function Oa(a, b, c, d, e) {
     return e;
   }
   e = 1 < e.length ? [].concat.apply([], e) : e[0];
-  return d ? Qa(e) : e;
+  return d ? Ta(e) : e;
 }
-function Qa(a) {
+function Ta(a) {
   for (let b = 0; b < a.length; b++) {
     a[b] = {score:b, id:a[b]};
   }
@@ -1489,19 +1519,19 @@ function Qa(a) {
   if (c.length) {
     return Promise.all(c).then(function() {
       a.result.length && (d = d.concat([a.result]));
-      a.result = Ra(d, e, f, g, h, a.F);
+      a.result = Ua(d, e, f, g, h, a.F);
       return h ? a.result : a;
     });
   }
-  d.length && (this.result.length && (d = d.concat([this.result])), this.result = Ra(d, e, f, g, h, this.F));
+  d.length && (this.result.length && (d = d.concat([this.result])), this.result = Ua(d, e, f, g, h, this.F));
   return h ? this.result : this;
 };
-function Ra(a, b, c, d, e, f) {
+function Ua(a, b, c, d, e, f) {
   if (!a.length) {
     return a;
   }
   "object" === typeof b && (c = b.offset || 0, d = b.enrich || !1, b = b.limit || 0);
-  return 2 > a.length ? e ? W(a[0], b, c, d) : a[0] : va(a, c, b, e, f);
+  return 2 > a.length ? e ? W(a[0], b, c, d) : a[0] : ya(a, c, b, e, f);
 }
 ;X.prototype.and = function() {
   if (this.result.length) {
@@ -1551,24 +1581,24 @@ function Ra(a, b, c, d, e, f) {
     if (a.length) {
       return Promise.all(a).then(function() {
         d = [b.result].concat(d);
-        b.result = Sa(d, e, f, g, b.F, h);
+        b.result = Va(d, e, f, g, b.F, h);
         return g ? b.result : b;
       });
     }
     d = [this.result].concat(d);
-    this.result = Sa(d, e, f, g, this.F, h);
+    this.result = Va(d, e, f, g, this.F, h);
     return g ? this.result : this;
   }
   return this;
 };
-function Sa(a, b, c, d, e, f) {
+function Va(a, b, c, d, e, f) {
   if (2 > a.length) {
     return [];
   }
   let g = [];
   B();
   let h = ca(a);
-  return h ? ua(a, h, b, c, f, e, d) : g;
+  return h ? xa(a, h, b, c, f, e, d) : g;
 }
 ;X.prototype.xor = function() {
   const a = this;
@@ -1614,14 +1644,14 @@ function Sa(a, b, c, d, e, f) {
   if (c.length) {
     return Promise.all(c).then(function() {
       a.result.length && (d = [a.result].concat(d));
-      a.result = Ta(d, e, f, g, !h, a.F);
+      a.result = Wa(d, e, f, g, !h, a.F);
       return h ? a.result : a;
     });
   }
-  d.length && (this.result.length && (d = [this.result].concat(d)), this.result = Ta(d, e, f, g, !h, a.F));
+  d.length && (this.result.length && (d = [this.result].concat(d)), this.result = Wa(d, e, f, g, !h, a.F));
   return h ? this.result : this;
 };
-function Ta(a, b, c, d, e, f) {
+function Wa(a, b, c, d, e, f) {
   if (!a.length) {
     return a;
   }
@@ -1715,14 +1745,14 @@ function Ta(a, b, c, d, e, f) {
   }
   if (c.length) {
     return Promise.all(c).then(function() {
-      a.result = Ua.call(a, d, e, f, g);
+      a.result = Xa.call(a, d, e, f, g);
       return g ? a.result : a;
     });
   }
-  d.length && (this.result = Ua.call(this, d, e, f, g));
+  d.length && (this.result = Xa.call(this, d, e, f, g));
   return g ? this.result : this;
 };
-function Ua(a, b, c, d) {
+function Xa(a, b, c, d) {
   if (!a.length) {
     return this.result;
   }
@@ -1752,7 +1782,7 @@ function Ua(a, b, c, d) {
   return e;
 }
 ;function X(a) {
-  if (!this) {
+  if (this.constructor !== X) {
     return new X(a);
   }
   if (a && a.index) {
@@ -1797,12 +1827,12 @@ X.prototype.boost = function(a) {
   return this;
 };
 X.prototype.resolve = function(a, b, c) {
-  Va = 1;
+  Ya = 1;
   const d = this.result;
   this.result = this.index = null;
   return d.length ? ("object" === typeof a && (c = a.enrich, b = a.offset, a = a.limit), W(d, a || 100, b, c)) : d;
 };
-let Va = 1;
+let Ya = 1;
 L.prototype.search = function(a, b, c) {
   c || (!b && H(a) ? (c = a, a = "") : H(b) && (c = b, b = 0));
   let d = [], e;
@@ -1813,22 +1843,22 @@ L.prototype.search = function(a, b, c) {
     g = c.offset || 0;
     var p = c.context;
     f = c.suggest;
-    (h = Va && !1 !== c.resolve) || (Va = 0);
+    (h = Ya && !1 !== c.resolve) || (Ya = 0);
     k = h && c.enrich;
     m = c.boost;
     l = this.db && c.tag;
   } else {
-    h = this.resolve || Va;
+    h = this.resolve || Ya;
   }
   a = this.encoder.encode(a);
   e = a.length;
   b || !h || (b = 100);
   if (1 === e) {
-    return Wa.call(this, a[0], "", b, g, h, k, l);
+    return Za.call(this, a[0], "", b, g, h, k, l);
   }
   p = this.depth && !1 !== p;
   if (2 === e && p && !f) {
-    return Wa.call(this, a[0], a[1], b, g, h, k, l);
+    return Za.call(this, a[0], a[1], b, g, h, k, l);
   }
   let n = c = 0;
   if (1 < e) {
@@ -1853,10 +1883,10 @@ L.prototype.search = function(a, b, c) {
   }
   let q = 0, t;
   if (1 === e) {
-    return Wa.call(this, a[0], "", b, g, h, k, l);
+    return Za.call(this, a[0], "", b, g, h, k, l);
   }
   if (2 === e && p && !f) {
-    return Wa.call(this, a[0], a[1], b, g, h, k, l);
+    return Za.call(this, a[0], a[1], b, g, h, k, l);
   }
   1 < e && (p ? (t = a[0], q = 1) : 9 < c && 3 < c / n && a.sort(aa));
   if (this.db) {
@@ -1867,7 +1897,7 @@ L.prototype.search = function(a, b, c) {
     return async function() {
       for (let u, x; q < e; q++) {
         x = a[q];
-        t ? (u = await Y(r, x, t, 0, 0, !1, !1), u = Xa(u, d, f, r.R), f && !1 === u && d.length || (t = x)) : (u = await Y(r, x, "", 0, 0, !1, !1), u = Xa(u, d, f, r.resolution));
+        t ? (u = await Y(r, x, t, 0, 0, !1, !1), u = $a(u, d, f, r.R), f && !1 === u && d.length || (t = x)) : (u = await Y(r, x, "", 0, 0, !1, !1), u = $a(u, d, f, r.resolution));
         if (u) {
           return u;
         }
@@ -1886,12 +1916,12 @@ L.prototype.search = function(a, b, c) {
           }
         }
       }
-      return h ? ua(d, r.resolution, b, g, f, m, h) : new X(d[0]);
+      return h ? xa(d, r.resolution, b, g, f, m, h) : new X(d[0]);
     }();
   }
   for (let r, u; q < e; q++) {
     u = a[q];
-    t ? (r = Y(this, u, t, 0, 0, !1, !1), r = Xa(r, d, f, this.R), f && !1 === r && d.length || (t = u)) : (r = Y(this, u, "", 0, 0, !1, !1), r = Xa(r, d, f, this.resolution));
+    t ? (r = Y(this, u, t, 0, 0, !1, !1), r = $a(r, d, f, this.R), f && !1 === r && d.length || (t = u)) : (r = Y(this, u, "", 0, 0, !1, !1), r = $a(r, d, f, this.resolution));
     if (r) {
       return r;
     }
@@ -1910,16 +1940,16 @@ L.prototype.search = function(a, b, c) {
       }
     }
   }
-  d = ua(d, this.resolution, b, g, f, m, h);
+  d = xa(d, this.resolution, b, g, f, m, h);
   return h ? d : new X(d);
 };
-function Wa(a, b, c, d, e, f, g) {
+function Za(a, b, c, d, e, f, g) {
   a = Y(this, a, b, c, d, e, f, g);
   return this.db ? a.then(function(h) {
     return e ? h : h && h.length ? e ? W(h, c, d) : new X(h) : e ? [] : new X([]);
   }) : a && a.length ? e ? W(a, c, d) : new X(a) : e ? [] : new X([]);
 }
-function Xa(a, b, c, d) {
+function $a(a, b, c, d) {
   let e = [];
   if (a) {
     d = Math.min(a.length, d);
@@ -1957,15 +1987,15 @@ function Y(a, b, c, d, e, f, g, h) {
         }
       }
     } else {
-      Ya(this.map, a), this.depth && Ya(this.ctx, a);
+      ab(this.map, a), this.depth && ab(this.ctx, a);
     }
     b || this.reg.delete(a);
   }
-  this.db && (this.commit_task.push({del:a}), this.T && Pa(this));
+  this.db && (this.commit_task.push({del:a}), this.T && Sa(this));
   this.cache && this.cache.remove(a);
   return this;
 };
-function Ya(a, b) {
+function ab(a, b) {
   let c = 0;
   if (a.constructor === Array) {
     for (let d = 0, e, f; d < a.length; d++) {
@@ -1980,24 +2010,24 @@ function Ya(a, b) {
     }
   } else {
     for (let d of a) {
-      const e = d[0], f = Ya(d[1], b);
+      const e = d[0], f = ab(d[1], b);
       f ? c += f : a.delete(e);
     }
   }
   return c;
 }
 ;function L(a, b) {
-  if (!this) {
+  if (this.constructor !== L) {
     return new L(a);
   }
   if (a) {
     var c = G(a) ? a : a.preset;
-    c && (Na[c] || console.warn("Preset not found: " + c), a = Object.assign({}, Na[c], a));
+    c && (Qa[c] || console.warn("Preset not found: " + c), a = Object.assign({}, Qa[c], a));
   } else {
     a = {};
   }
   c = a.context || {};
-  const d = G(a.encoder) ? Ma[a.encoder] : a.encode || a.encoder || Ea;
+  const d = G(a.encoder) ? Pa[a.encoder] : a.encode || a.encoder || Ha;
   this.encoder = d.encode ? d : "object" === typeof d ? new K(d) : {encode:d};
   let e;
   this.resolution = a.resolution || 9;
@@ -2034,7 +2064,7 @@ v.destroy = function() {
   this.commit_timer && (clearTimeout(this.commit_timer), this.commit_timer = null);
   return this.db.destroy();
 };
-function Pa(a) {
+function Sa(a) {
   a.commit_timer || (a.commit_timer = setTimeout(function() {
     a.commit_timer = null;
     a.db.commit(a, void 0, void 0);
@@ -2058,7 +2088,7 @@ v.update = function(a, b) {
   const c = this, d = this.remove(a);
   return d && d.then ? d.then(() => c.add(a, b)) : this.add(a, b);
 };
-function Za(a) {
+function bb(a) {
   let b = 0;
   if (a.constructor === Array) {
     for (let c = 0, d; c < a.length; c++) {
@@ -2066,7 +2096,7 @@ function Za(a) {
     }
   } else {
     for (const c of a) {
-      const d = c[0], e = Za(c[1]);
+      const d = c[0], e = bb(c[1]);
       e ? b += e : a.delete(d);
     }
   }
@@ -2076,63 +2106,47 @@ v.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
-  Za(this.map);
-  this.depth && Za(this.ctx);
+  bb(this.map);
+  this.depth && bb(this.ctx);
   return this;
 };
-v.searchCache = Da;
-v.export = function(a, b, c, d, e, f) {
-  let g = !0;
-  "undefined" === typeof f && (g = new Promise(l => {
-    f = l;
-  }));
-  let h, k;
-  switch(e || (e = 0)) {
+v.searchCache = Ga;
+v.export = function(a, b, c, d = 0) {
+  let e, f;
+  switch(d) {
     case 0:
-      h = "reg";
-      if (this.fastupdate) {
-        k = B();
-        for (let l of this.reg.keys()) {
-          k[l] = 1;
-        }
-      } else {
-        k = this.reg;
-      }
+      e = "reg";
+      f = qa(this.reg);
       break;
     case 1:
-      h = "cfg";
-      k = {doc:0, opt:this.h ? 1 : 0};
+      e = "cfg";
+      f = {};
       break;
     case 2:
-      h = "map";
-      k = this.map;
+      e = "map";
+      f = oa(this.map);
       break;
     case 3:
-      h = "ctx";
-      k = this.ctx;
+      e = "ctx";
+      f = pa(this.ctx);
       break;
     default:
-      "undefined" === typeof c && f && f();
       return;
   }
-  oa(a, b || this, c, h, d, e, k, f);
-  return g;
+  return ra.call(this, a, b, e, c, d, f);
 };
 v.import = function(a, b) {
   if (b) {
     switch(G(b) && (b = JSON.parse(b)), a) {
-      case "cfg":
-        this.h = !!b.opt;
-        break;
       case "reg":
         this.fastupdate = !1;
-        this.reg = b;
+        this.reg = new Set(b);
         break;
       case "map":
-        this.map = b;
+        this.map = new Map(b);
         break;
       case "ctx":
-        this.ctx = b;
+        this.ctx = new Map(b);
     }
   }
 };
@@ -2187,10 +2201,10 @@ v.serialize = function(a = !0) {
   return a ? "function inject(index){" + b + d + e + "}" : b + d + e;
 };
 na(L.prototype);
-const $a = "undefined" !== typeof window && (window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB), ab = ["map", "ctx", "tag", "reg", "cfg"];
-function bb(a, b = {}) {
+const cb = "undefined" !== typeof window && (window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB), db = ["map", "ctx", "tag", "reg", "cfg"];
+function eb(a, b = {}) {
   if (!this) {
-    return new bb(a, b);
+    return new eb(a, b);
   }
   "object" === typeof a && (b = a = a.name);
   a || console.info("Default storage space was used, because a name was not passed.");
@@ -2200,7 +2214,7 @@ function bb(a, b = {}) {
   this.db = null;
   this.h = {};
 }
-v = bb.prototype;
+v = eb.prototype;
 v.mount = function(a) {
   if (!a.encoder) {
     return a.mount(this);
@@ -2212,10 +2226,10 @@ v.open = function() {
   let a = this;
   navigator.storage && navigator.storage.persist();
   return this.db || new Promise(function(b, c) {
-    const d = $a.open(a.id + (a.field ? ":" + a.field : ""), 1);
+    const d = cb.open(a.id + (a.field ? ":" + a.field : ""), 1);
     d.onupgradeneeded = function() {
       const e = a.db = this.result;
-      ab.forEach(f => {
+      db.forEach(f => {
         e.objectStoreNames.contains(f) || e.createObjectStore(f);
       });
     };
@@ -2241,12 +2255,12 @@ v.close = function() {
   this.db = null;
 };
 v.destroy = function() {
-  return $a.deleteDatabase(this.id + (this.field ? ":" + this.field : ""));
+  return cb.deleteDatabase(this.id + (this.field ? ":" + this.field : ""));
 };
 v.clear = function() {
-  const a = this.db.transaction(ab, "readwrite");
-  for (let b = 0; b < ab.length; b++) {
-    a.objectStore(ab[b]).clear();
+  const a = this.db.transaction(db, "readwrite");
+  for (let b = 0; b < db.length; b++) {
+    a.objectStore(db[b]).clear();
   }
   return Z(a);
 };
@@ -2430,7 +2444,7 @@ v.commit = async function(a, b, c) {
     }
   }), a.map.clear(), a.ctx.clear(), a.tag && a.tag.clear(), a.store && a.store.clear(), a.document || a.reg.clear());
 };
-function db(a, b, c) {
+function gb(a, b, c) {
   const d = a.value;
   let e, f, g = 0;
   for (let h = 0, k; h < d.length; h++) {
@@ -2459,17 +2473,17 @@ v.remove = function(a) {
   return Promise.all([this.transaction("map", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       const c = this.result;
-      c && db(c, a);
+      c && gb(c, a);
     };
   }), this.transaction("ctx", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       const c = this.result;
-      c && db(c, a);
+      c && gb(c, a);
     };
   }), this.transaction("tag", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       const c = this.result;
-      c && db(c, a, !0);
+      c && gb(c, a, !0);
     };
   }), this.transaction("reg", "readwrite", function(b) {
     for (let c = 0; c < a.length; c++) {
@@ -2489,9 +2503,9 @@ function Z(a) {
     a = null;
   });
 }
-;const eb = {Index:L, Charset:Ma, Encoder:K, Document:T, Worker:N, Resolver:X, IndexedDB:bb, Language:{}}, fb = self;
-let gb;
-(gb = fb.define) && gb.amd ? gb([], function() {
-  return eb;
-}) : "object" === typeof fb.exports ? fb.exports = eb : fb.FlexSearch = eb;
+;const hb = {Index:L, Charset:Pa, Encoder:K, Document:T, Worker:N, Resolver:X, IndexedDB:eb, Language:{}}, ib = self;
+let jb;
+(jb = ib.define) && jb.amd ? jb([], function() {
+  return hb;
+}) : "object" === typeof ib.exports ? ib.exports = hb : ib.FlexSearch = hb;
 }(this||self));
diff --git a/dist/flexsearch.bundle.min.js b/dist/flexsearch.bundle.min.js
index 78ed6e9..0264a58 100644
--- a/dist/flexsearch.bundle.min.js
+++ b/dist/flexsearch.bundle.min.js
@@ -12,7 +12,7 @@ function F(a){return"string"===typeof a}function G(a){return"object"===typeof a}
 "i"],["\u01d2","o"],["\u01d4","u"],["\u01d6","u"],["\u01d8","u"],["\u01da","u"],["\u01dc","u"],["\u01df","a"],["\u01e1","a"],["\u01e3","ae"],["\u00e6","ae"],["\u01fd","ae"],["\u01e7","g"],["\u01e9","k"],["\u01eb","o"],["\u01ed","o"],["\u01ef","\u0292"],["\u01f0","j"],["\u01f3","dz"],["\u01f5","g"],["\u01f9","n"],["\u01fb","a"],["\u01ff","\u00f8"],["\u0201","a"],["\u0203","a"],["\u0205","e"],["\u0207","e"],["\u0209","i"],["\u020b","i"],["\u020d","o"],["\u020f","o"],["\u0211","r"],["\u0213","r"],["\u0215",
 "u"],["\u0217","u"],["\u0219","s"],["\u021b","t"],["\u021f","h"],["\u0227","a"],["\u0229","e"],["\u022b","o"],["\u022d","o"],["\u022f","o"],["\u0231","o"],["\u0233","y"],["\u02b0","h"],["\u02b1","h"],["\u0266","h"],["\u02b2","j"],["\u02b3","r"],["\u02b4","\u0279"],["\u02b5","\u027b"],["\u02b6","\u0281"],["\u02b7","w"],["\u02b8","y"],["\u02e0","\u0263"],["\u02e1","l"],["\u02e2","s"],["\u02e3","x"],["\u02e4","\u0295"],["\u0390","\u03b9"],["\u03ac","\u03b1"],["\u03ad","\u03b5"],["\u03ae","\u03b7"],["\u03af",
 "\u03b9"],["\u03b0","\u03c5"],["\u03ca","\u03b9"],["\u03cb","\u03c5"],["\u03cc","\u03bf"],["\u03cd","\u03c5"],["\u03ce","\u03c9"],["\u03d0","\u03b2"],["\u03d1","\u03b8"],["\u03d2","\u03a5"],["\u03d3","\u03a5"],["\u03d4","\u03a5"],["\u03d5","\u03c6"],["\u03d6","\u03c0"],["\u03f0","\u03ba"],["\u03f1","\u03c1"],["\u03f2","\u03c2"],["\u03f5","\u03b5"],["\u0439","\u0438"],["\u0450","\u0435"],["\u0451","\u0435"],["\u0453","\u0433"],["\u0457","\u0456"],["\u045c","\u043a"],["\u045d","\u0438"],["\u045e","\u0443"],
-["\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 ea=/[^\p{L}\p{N}]+/u,fa=/(\d{3})/g,ha=/(\D)(\d{3})/g,ia=/(\d{3})(\D)/g,ja="".normalize&&/[\u0300-\u036f]/g;function K(a){if(!this)return new K(...arguments);for(let b=0;b<arguments.length;b++)this.assign(arguments[b])}
+["\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 ea=/[^\p{L}\p{N}]+/u,fa=/(\d{3})/g,ha=/(\D)(\d{3})/g,ia=/(\d{3})(\D)/g,ja="".normalize&&/[\u0300-\u036f]/g;function K(a){if(this.constructor!==K)return new K(...arguments);for(let b=0;b<arguments.length;b++)this.assign(arguments[b])}
 K.prototype.assign=function(a){this.normalize=z(a.normalize,!0,this.normalize);let b=a.include,c=b||a.exclude||a.split;if("object"===typeof c){let d=!b,e="";a.include||(e+="\\p{Z}");c.letter&&(e+="\\p{L}");c.number&&(e+="\\p{N}",d=!!b);c.symbol&&(e+="\\p{S}");c.punctuation&&(e+="\\p{P}");c.control&&(e+="\\p{C}");if(c=c.char)e+="object"===typeof c?c.join(""):c;try{this.split=new RegExp("["+(b?"^":"")+e+"]+","u")}catch(f){this.split=/\s+/}this.numeric=d}else{try{this.split=z(c,ea,this.split)}catch(d){this.split=
 /\s+/}this.numeric=z(this.numeric,!0)}this.prepare=z(a.prepare,null,this.prepare);this.finalize=z(a.finalize,null,this.finalize);ja||(this.mapper=new Map(da));this.rtl=a.rtl||!1;this.dedupe=z(a.dedupe,!0,this.dedupe);this.filter=z((c=a.filter)&&new Set(c),null,this.filter);this.matcher=z((c=a.matcher)&&new Map(c),null,this.matcher);this.mapper=z((c=a.mapper)&&new Map(c),null,this.mapper);this.stemmer=z((c=a.stemmer)&&new Map(c),null,this.stemmer);this.replacer=z(a.replacer,null,this.replacer);this.minlength=
 z(a.minlength,1,this.minlength);this.maxlength=z(a.maxlength,0,this.maxlength);if(this.cache=c=z(a.cache,!0,this.cache))this.L=null,this.S="number"===typeof c?c:2E5,this.H=new Map,this.J=new Map,this.A=this.h=128;this.B="";this.O=null;this.M="";this.P=null;if(this.matcher)for(const d of this.matcher.keys())this.B+=(this.B?"|":"")+d;if(this.stemmer)for(const d of this.stemmer.keys())this.M+=(this.M?"|":"")+d;return this};
@@ -20,72 +20,72 @@ K.prototype.encode=function(a){if(this.cache&&a.length<=this.h)if(this.L){if(thi
 let c=[],d=this.split||""===this.split?a.split(this.split):a;for(let f=0,g,h;f<d.length;f++){if(!(g=h=d[f]))continue;if(g.length<this.minlength)continue;if(b){c.push(g);continue}if(this.filter&&this.filter.has(g))continue;if(this.cache&&g.length<=this.A)if(this.L){var e=this.J.get(g);if(e||""===e){e&&c.push(e);continue}}else this.L=setTimeout(ka,50,this);let k;this.stemmer&&2<g.length&&(this.P||(this.P=new RegExp("(?!^)("+this.M+")$")),g=g.replace(this.P,l=>this.stemmer.get(l)),k=1);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="",p,n;l<g.length;l++)p=g.charAt(l),p===m&&this.dedupe||((n=this.mapper&&this.mapper.get(p))||""===n?n===m&&this.dedupe||!(m=n)||(e+=n):e+=m=p);g=e}this.matcher&&1<g.length&&(this.O||(this.O=new RegExp("("+this.B+")","g")),g=g.replace(this.O,l=>this.matcher.get(l)));if(g&&this.replacer)for(e=0;g&&e<this.replacer.length;e+=2)g=g.replace(this.replacer[e],this.replacer[e+1]);this.cache&&
 h.length<=this.A&&(this.J.set(h,g),this.J.size>this.S&&(this.J.clear(),this.A=this.A/1.1|0));g&&c.push(g)}this.finalize&&(c=this.finalize(c)||c);this.cache&&a.length<=this.h&&(this.H.set(a,c),this.H.size>this.S&&(this.H.clear(),this.h=this.h/1.1|0));return c};function ka(a){a.L=null;a.H.clear();a.J.clear()};async function la(a){a=a.data;var b=self._index;const c=a.args;var d=a.task;switch(d){case "init":d=a.options||{};(b=d.config)&&(d=(await import(b))["default"]);(b=a.factory)?(Function("return "+b)()(self),self._index=new self.FlexSearch.Index(d),delete self.FlexSearch):self._index=new L(d);postMessage({id:a.id});break;default:a=a.id,b=b[d].apply(b,c),postMessage("search"===d?{id:a,msg:b}:{id:a})}};let M=0;
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+function bb(a){let b=0;if(a.constructor===Array)for(let c=0,d;c<a.length;c++)(d=a[c])&&(b+=d.length);else for(const c of a){const d=c[0],e=bb(c[1]);e?b+=e:a.delete(d)}return b}v.cleanup=function(){if(!this.fastupdate)return this;bb(this.map);this.depth&&bb(this.ctx);return this};v.searchCache=Ga;
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 v.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,p;m<g.length;m++){p=g[m]||[""];var k="";for(var l=0;l<p.length;l++)k+=(k?",":"")+("string"===c?'"'+p[l]+'"':p[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 p of g.entries()){g=p[0];h=p[1];k="";for(let n=0,q;n<h.length;n++){q=h[n]||[""];l="";for(let r=0;r<q.length;r++)l+=(l?",":"")+("string"===c?'"'+q[r]+'"':q[r]);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};na(L.prototype);const $a="undefined"!==typeof window&&(window.indexedDB||window.mozIndexedDB||window.webkitIndexedDB||window.msIndexedDB),ab=["map","ctx","tag","reg","cfg"];
-function cb(a,b={}){if(!this)return new cb(a,b);"object"===typeof a&&(b=a=a.name);a||console.info("Default storage space was used, because a name was not passed.");this.id="flexsearch"+(a?":"+a.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"");this.field=b.field?b.field.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"";this.support_tag_search=!1;this.db=null;this.h={}}v=cb.prototype;v.mount=function(a){if(!a.encoder)return a.mount(this);a.db=this;return this.open()};
-v.open=function(){let a=this;navigator.storage&&navigator.storage.persist();return this.db||new Promise(function(b,c){const d=$a.open(a.id+(a.field?":"+a.field:""),1);d.onupgradeneeded=function(){const e=a.db=this.result;ab.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)}})};
-v.close=function(){this.db.close();this.db=null};v.destroy=function(){return $a.deleteDatabase(this.id+(this.field?":"+this.field:""))};v.clear=function(){const a=this.db.transaction(ab,"readwrite");for(let b=0;b<ab.length;b++)a.objectStore(ab[b]).clear();return Z(a)};
+m[0];g=m[1];for(const p of g.entries()){g=p[0];h=p[1];k="";for(let n=0,q;n<h.length;n++){q=h[n]||[""];l="";for(let r=0;r<q.length;r++)l+=(l?",":"")+("string"===c?'"'+q[r]+'"':q[r]);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};na(L.prototype);const cb="undefined"!==typeof window&&(window.indexedDB||window.mozIndexedDB||window.webkitIndexedDB||window.msIndexedDB),db=["map","ctx","tag","reg","cfg"];
+function fb(a,b={}){if(!this)return new fb(a,b);"object"===typeof a&&(b=a=a.name);a||console.info("Default storage space was used, because a name was not passed.");this.id="flexsearch"+(a?":"+a.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"");this.field=b.field?b.field.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"";this.support_tag_search=!1;this.db=null;this.h={}}v=fb.prototype;v.mount=function(a){if(!a.encoder)return a.mount(this);a.db=this;return this.open()};
+v.open=function(){let a=this;navigator.storage&&navigator.storage.persist();return this.db||new Promise(function(b,c){const d=cb.open(a.id+(a.field?":"+a.field:""),1);d.onupgradeneeded=function(){const e=a.db=this.result;db.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)}})};
+v.close=function(){this.db.close();this.db=null};v.destroy=function(){return cb.deleteDatabase(this.id+(this.field?":"+this.field:""))};v.clear=function(){const a=this.db.transaction(db,"readwrite");for(let b=0;b<db.length;b++)a.objectStore(db[b]).clear();return Z(a)};
 v.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 p=c?d+Math.min(m.length-d,c):m.length;for(let n=d;n<p;n++)k.push(m[n]);d=0;if(k.length===c)break}return f?g.enrich(k):k}return h})};
 v.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})};
 v.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})};v.has=function(a){a=this.db.transaction("reg","readonly").objectStore("reg").getKey(a);return Z(a)};v.search=null;v.info=function(){};
@@ -94,6 +94,6 @@ v.commit=async function(a,b,c){if(b)await this.clear(),a.commit_task=[];else{let
 for(let m=0,p,n;m<l;m++)if((n=g[m])&&n.length){if((p=h[m])&&p.length)for(k=0;k<n.length;k++)p.push(n[k]);else h[m]=n;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 p;if(m&&m.length){const n=Math.max(m.length,l.length);for(let q=0,r,t;q<n;q++)if((t=l[q])&&t.length){if((r=m[q])&&r.length)for(p=
 0;p<t.length;p++)r.push(t[p]);else m[q]=t;p=1}}else m=l,p=1;p&&d.put(m,f+":"+k)})}}}),a.store?await this.transaction("reg","readwrite",function(d){for(const e of a.store){const f=e[0],g=e[1];d.put("object"===typeof g?JSON.stringify(g):1,f)}}):a.bypass||await this.transaction("reg","readwrite",function(d){for(const e of a.reg.keys())d.put(1,e)}),a.tag&&await this.transaction("tag","readwrite",function(d){for(const e of a.tag){const f=e[0],g=e[1];g.length&&(d.get(f).onsuccess=function(){let h=this.result;
 h=h&&h.length?h.concat(g):g;d.put(h,f)})}}),a.map.clear(),a.ctx.clear(),a.tag&&a.tag.clear(),a.store&&a.store.clear(),a.document||a.reg.clear())};
-function db(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,p;l<b.length;l++)if(p=b[l],m=k.indexOf(f?parseInt(p,10):p),0>m&&!f&&"string"===typeof p&&!isNaN(p)&&(m=k.indexOf(parseInt(p,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()}
-v.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&&db(c,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&db(c,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&db(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 eb={Index:L,Charset:Ma,Encoder:K,Document:T,Worker:N,Resolver:X,IndexedDB:cb,Language:{}},fb=self;let gb;(gb=fb.define)&&gb.amd?gb([],function(){return eb}):"object"===typeof fb.exports?fb.exports=eb:fb.FlexSearch=eb;}(this||self));
+function gb(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,p;l<b.length;l++)if(p=b[l],m=k.indexOf(f?parseInt(p,10):p),0>m&&!f&&"string"===typeof p&&!isNaN(p)&&(m=k.indexOf(parseInt(p,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()}
+v.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&&gb(c,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&gb(c,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&gb(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 hb={Index:L,Charset:Pa,Encoder:K,Document:T,Worker:N,Resolver:X,IndexedDB:fb,Language:{}},ib=self;let jb;(jb=ib.define)&&jb.amd?jb([],function(){return hb}):"object"===typeof ib.exports?ib.exports=hb:ib.FlexSearch=hb;}(this||self));
diff --git a/dist/flexsearch.bundle.module.debug.js b/dist/flexsearch.bundle.module.debug.js
index 6f3550c..a170ce0 100644
--- a/dist/flexsearch.bundle.module.debug.js
+++ b/dist/flexsearch.bundle.module.debug.js
@@ -89,7 +89,7 @@ function ca(a) {
 "\u04d9"], ["\u04dd", "\u0436"], ["\u04df", "\u0437"], ["\u04e3", "\u0438"], ["\u04e5", "\u0438"], ["\u04e7", "\u043e"], ["\u04eb", "\u04e9"], ["\u04ed", "\u044d"], ["\u04ef", "\u0443"], ["\u04f1", "\u0443"], ["\u04f3", "\u0443"], ["\u04f5", "\u0447"]];
 const ea = /[^\p{L}\p{N}]+/u, fa = /(\d{3})/g, ha = /(\D)(\d{3})/g, ia = /(\d{3})(\D)/g, ja = "".normalize && /[\u0300-\u036f]/g;
 function K(a) {
-  if (!this) {
+  if (this.constructor !== K) {
     return new K(...arguments);
   }
   for (let b = 0; b < arguments.length; b++) {
@@ -263,7 +263,7 @@ function N(a = {}) {
       return this;
     }
   }
-  if (!this) {
+  if (this.constructor !== N) {
     return new N(a);
   }
   let c = "undefined" !== typeof self ? self._factory : "undefined" !== typeof window ? window._factory : null;
@@ -313,12 +313,37 @@ function P(a) {
     return b;
   };
 }
-;function oa(a, b, c, d, e, f, g, h) {
-  (d = a(c ? c + "." + d : d, JSON.stringify(g))) && d.then ? d.then(function() {
-    b.export(a, b, c, e, f + 1, h);
-  }) : b.export(a, b, c, e, f + 1, h);
+;function oa(a) {
+  const b = [];
+  for (const c of a.entries()) {
+    b.push(c);
+  }
+  return b;
 }
-;function pa(a, b, c, d) {
+function pa(a) {
+  const b = [];
+  for (const c of a.entries()) {
+    b.push(oa(c));
+  }
+  return b;
+}
+function qa(a) {
+  const b = [];
+  for (const c of a.keys()) {
+    b.push(c);
+  }
+  return b;
+}
+function ra(a, b, c, d, e, f) {
+  if ((c = a(b ? b + "." + c : c, JSON.stringify(f))) && c.then) {
+    const g = this;
+    return c.then(function() {
+      return g.export(a, b, d, e + 1);
+    });
+  }
+  return this.export(a, b, d, e + 1);
+}
+;function sa(a, b, c, d) {
   let e = [];
   for (let f = 0, g; f < a.index.length; f++) {
     if (g = a.index[f], b >= g.length) {
@@ -384,12 +409,12 @@ function Q(a) {
     }
     if ("slice" === d) {
       return function(e, f) {
-        return pa(b, e || 0, f || b.length, !1);
+        return sa(b, e || 0, f || b.length, !1);
       };
     }
     if ("splice" === d) {
       return function(e, f) {
-        return pa(b, e || 0, f || b.length, !0);
+        return sa(b, e || 0, f || b.length, !0);
       };
     }
     if ("constructor" === d) {
@@ -420,7 +445,7 @@ function R(a = 8) {
   this.index = B();
   this.B = [];
   this.size = 0;
-  32 < a ? (this.h = qa, this.A = BigInt(a)) : (this.h = ra, this.A = a);
+  32 < a ? (this.h = ta, this.A = BigInt(a)) : (this.h = ua, this.A = a);
 }
 R.prototype.get = function(a) {
   const b = this.index[this.h(a)];
@@ -437,7 +462,7 @@ function S(a = 8) {
   }
   this.index = B();
   this.h = [];
-  32 < a ? (this.B = qa, this.A = BigInt(a)) : (this.B = ra, this.A = a);
+  32 < a ? (this.B = ta, this.A = BigInt(a)) : (this.B = ua, this.A = a);
 }
 S.prototype.add = function(a) {
   var b = this.B(a);
@@ -479,7 +504,7 @@ v.entries = S.prototype.entries = function*() {
     }
   }
 };
-function ra(a) {
+function ua(a) {
   let b = 2 ** this.A - 1;
   if ("number" == typeof a) {
     return a & b;
@@ -490,7 +515,7 @@ function ra(a) {
   }
   return 32 === this.A ? c + 2 ** 31 : c;
 }
-function qa(a) {
+function ta(a) {
   let b = BigInt(2) ** this.A - BigInt(1);
   var c = typeof a;
   if ("bigint" === c) {
@@ -520,7 +545,7 @@ function qa(a) {
         e && d.add(a, e, !1, !0);
       } else {
         if (e = k.I, !e || e(b)) {
-          k.constructor === String ? k = ["" + k] : G(k) && (k = [k]), sa(b, k, this.K, 0, d, a, k[0], c);
+          k.constructor === String ? k = ["" + k] : G(k) && (k = [k]), va(b, k, this.K, 0, d, a, k[0], c);
         }
       }
     }
@@ -583,7 +608,7 @@ function qa(a) {
             h[l] = b[l];
             continue;
           }
-          ta(b, h, l, 0, l[0], m);
+          wa(b, h, l, 0, l[0], m);
         }
       }
       this.store.set(a, h || b);
@@ -591,21 +616,21 @@ function qa(a) {
   }
   return this;
 };
-function ta(a, b, c, d, e, f) {
+function wa(a, b, c, d, e, f) {
   a = a[e];
   if (d === c.length - 1) {
     b[e] = f || a;
   } else if (a) {
     if (a.constructor === Array) {
       for (b = b[e] = Array(a.length), e = 0; e < a.length; e++) {
-        ta(a, b, c, d, e);
+        wa(a, b, c, d, e);
       }
     } else {
-      b = b[e] || (b[e] = B()), e = c[++d], ta(a, b, c, d, e);
+      b = b[e] || (b[e] = B()), e = c[++d], wa(a, b, c, d, e);
     }
   }
 }
-function sa(a, b, c, d, e, f, g, h) {
+function va(a, b, c, d, e, f, g, h) {
   if (a = a[g]) {
     if (d === b.length - 1) {
       if (a.constructor === Array) {
@@ -621,17 +646,17 @@ function sa(a, b, c, d, e, f, g, h) {
     } else {
       if (a.constructor === Array) {
         for (g = 0; g < a.length; g++) {
-          sa(a, b, c, d, e, f, g, h);
+          va(a, b, c, d, e, f, g, h);
         }
       } else {
-        g = b[++d], sa(a, b, c, d, e, f, g, h);
+        g = b[++d], va(a, b, c, d, e, f, g, h);
       }
     }
   } else {
     e.db && e.remove(f);
   }
 }
-;function ua(a, b, c, d, e, f, g) {
+;function xa(a, b, c, d, e, f, g) {
   const h = a.length;
   let k = [], l;
   var m;
@@ -647,7 +672,7 @@ function sa(a, b, c, d, e, f, g, h) {
   }
   if (a = k.length) {
     if (e) {
-      k = 1 < k.length ? va(k, d, c, g, 0) : (k = k[0]).length > c || d ? k.slice(d, c + d) : k;
+      k = 1 < k.length ? ya(k, d, c, g, 0) : (k = k[0]).length > c || d ? k.slice(d, c + d) : k;
     } else {
       if (a < h) {
         return [];
@@ -680,7 +705,7 @@ function sa(a, b, c, d, e, f, g, h) {
   }
   return k;
 }
-function va(a, b, c, d, e) {
+function ya(a, b, c, d, e) {
   const f = [], g = B();
   let h;
   var k = a.length;
@@ -723,7 +748,7 @@ function va(a, b, c, d, e) {
   }
   return f;
 }
-function wa(a, b) {
+function za(a, b) {
   const c = B(), d = [];
   for (let e = 0, f; e < b.length; e++) {
     f = b[e];
@@ -801,7 +826,7 @@ function wa(a, b) {
               }
               t.push(d = d.db.tag(r[n + 1], b, l, q));
             } else {
-              d = xa.call(this, r[n], r[n + 1], b, l, q);
+              d = Aa.call(this, r[n], r[n + 1], b, l, q);
             }
             e.push({field:r[n], tag:r[n + 1], result:d});
           }
@@ -853,7 +878,7 @@ function wa(a, b) {
           }
         }
       } else {
-        for (let E = 0, F, $a; E < n.length; E += 2) {
+        for (let E = 0, F, cb; E < n.length; E += 2) {
           F = this.tag.get(n[E]);
           if (!F) {
             if (console.warn("Tag '" + n[E] + ":" + n[E + 1] + "' will be skipped because there is no field '" + n[E] + "'."), t) {
@@ -862,7 +887,7 @@ function wa(a, b) {
               return e;
             }
           }
-          if ($a = (F = F && F.get(n[E + 1])) && F.length) {
+          if (cb = (F = F && F.get(n[E + 1])) && F.length) {
             x++, u.push(F);
           } else if (!t) {
             return e;
@@ -870,7 +895,7 @@ function wa(a, b) {
         }
       }
       if (x) {
-        w = wa(w, u);
+        w = za(w, u);
         I = w.length;
         if (!I && !t) {
           return e;
@@ -912,7 +937,7 @@ function wa(a, b) {
   r = [];
   for (let y = 0, w; y < f.length; y++) {
     w = e[y];
-    q && w.length && !w[0].doc && (this.db ? r.push(w = this.index.get(this.field[0]).db.enrich(w)) : w.length && (w = ya.call(this, w)));
+    q && w.length && !w[0].doc && (this.db ? r.push(w = this.index.get(this.field[0]).db.enrich(w)) : w.length && (w = Ba.call(this, w)));
     if (g) {
       return w;
     }
@@ -924,12 +949,12 @@ function wa(a, b) {
       for (let A = 0; A < w.length; A++) {
         e[A].result = w[A];
       }
-      return h ? za(e, b) : p ? Aa(e, a, y.index, y.field, y.D, p) : e;
+      return h ? Ca(e, b) : p ? Da(e, a, y.index, y.field, y.D, p) : e;
     });
   }
-  return h ? za(e, b) : p ? Aa(e, a, this.index, this.field, this.D, p) : e;
+  return h ? Ca(e, b) : p ? Da(e, a, this.index, this.field, this.D, p) : e;
 };
-function Aa(a, b, c, d, e, f) {
+function Da(a, b, c, d, e, f) {
   let g, h, k;
   for (let m = 0, p, n, q, t, r; m < a.length; m++) {
     p = a[m].result;
@@ -971,7 +996,7 @@ function Aa(a, b, c, d, e, f) {
   }
   return a;
 }
-function za(a, b) {
+function Ca(a, b) {
   const c = [], d = B();
   for (let e = 0, f, g; e < a.length; e++) {
     f = a[e];
@@ -990,7 +1015,7 @@ function za(a, b) {
   }
   return c;
 }
-function xa(a, b, c, d, e) {
+function Aa(a, b, c, d, e) {
   let f = this.tag.get(a);
   if (!f) {
     return console.warn("Tag '" + a + "' was not found"), [];
@@ -999,11 +1024,11 @@ function xa(a, b, c, d, e) {
     if (a > c || d) {
       f = f.slice(d, d + c);
     }
-    e && (f = ya.call(this, f));
+    e && (f = Ba.call(this, f));
     return f;
   }
 }
-function ya(a) {
+function Ba(a) {
   const b = Array(a.length);
   for (let c = 0, d; c < a.length; c++) {
     d = a[c], b[c] = {id:d, doc:this.store.get(d)};
@@ -1011,7 +1036,7 @@ function ya(a) {
   return b;
 }
 ;function T(a) {
-  if (!this) {
+  if (this.constructor !== T) {
     return new T(a);
   }
   const b = a.document || a.doc || a;
@@ -1019,7 +1044,7 @@ function ya(a) {
   this.D = [];
   this.field = [];
   this.K = [];
-  this.key = (c = b.key || b.id) && Ba(c, this.K) || "id";
+  this.key = (c = b.key || b.id) && Ea(c, this.K) || "id";
   (d = a.keystore || 0) && (this.keystore = d);
   this.reg = (this.fastupdate = !!a.fastupdate) ? d ? new R(d) : new Map() : d ? new S(d) : new Set();
   this.C = (c = b.store || null) && !0 !== c && [];
@@ -1027,7 +1052,7 @@ function ya(a) {
   this.cache = (c = a.cache || null) && new U(c);
   a.cache = !1;
   this.worker = a.worker;
-  this.index = Ca.call(this, a, b);
+  this.index = Fa.call(this, a, b);
   this.tag = null;
   if (c = b.tag) {
     if ("string" === typeof c && (c = [c]), c.length) {
@@ -1040,7 +1065,7 @@ function ya(a) {
         if (!g) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
-        f.custom ? this.G[e] = f.custom : (this.G[e] = Ba(g, this.K), f.filter && ("string" === typeof this.G[e] && (this.G[e] = new String(this.G[e])), this.G[e].I = f.filter));
+        f.custom ? this.G[e] = f.custom : (this.G[e] = Ea(g, this.K), f.filter && ("string" === typeof this.G[e] && (this.G[e] = new String(this.G[e])), this.G[e].I = f.filter));
         this.N[e] = g;
         this.tag.set(g, new Map());
       }
@@ -1108,7 +1133,7 @@ v.destroy = function() {
   }
   return Promise.all(a);
 };
-function Ca(a, b) {
+function Fa(a, b) {
   const c = new Map();
   let d = b.index || b.field || b;
   G(d) && (d = [d]);
@@ -1121,19 +1146,19 @@ function Ca(a, b) {
       c.set(f, h);
     }
     this.worker || c.set(f, new L(g, this.reg));
-    g.custom ? this.D[e] = g.custom : (this.D[e] = Ba(f, this.K), g.filter && ("string" === typeof this.D[e] && (this.D[e] = new String(this.D[e])), this.D[e].I = g.filter));
+    g.custom ? this.D[e] = g.custom : (this.D[e] = Ea(f, this.K), g.filter && ("string" === typeof this.D[e] && (this.D[e] = new String(this.D[e])), this.D[e].I = g.filter));
     this.field[e] = f;
   }
   if (this.C) {
     a = b.store;
     G(a) && (a = [a]);
     for (let e = 0, f, g; e < a.length; e++) {
-      f = a[e], g = f.field || f, f.custom ? (this.C[e] = f.custom, f.custom.U = g) : (this.C[e] = Ba(g, this.K), f.filter && ("string" === typeof this.C[e] && (this.C[e] = new String(this.C[e])), this.C[e].I = f.filter));
+      f = a[e], g = f.field || f, f.custom ? (this.C[e] = f.custom, f.custom.U = g) : (this.C[e] = Ea(g, this.K), f.filter && ("string" === typeof this.C[e] && (this.C[e] = new String(this.C[e])), this.C[e].I = f.filter));
     }
   }
   return c;
 }
-function Ba(a, b) {
+function Ea(a, b) {
   const c = a.split(":");
   let d = 0;
   for (let e = 0; e < c.length; e++) {
@@ -1199,65 +1224,70 @@ v.set = function(a, b) {
   this.store.set(a, b);
   return this;
 };
-v.searchCache = Da;
-v.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.A;
-        c = null;
-        break;
-      case 2:
-        b = "store";
-        h = this.store;
-        c = null;
-        break;
-      default:
-        f();
-        return;
+v.searchCache = Ga;
+v.export = function(a, b, c = 0, d = 0) {
+  if (c < this.field.length) {
+    const g = this.field[c];
+    if ((b = this.index.get(g).export(a, g, c, d = 1)) && b.then) {
+      const h = this;
+      return b.then(function() {
+        return h.export(a, g, c + 1, d = 0);
+      });
     }
-    oa(a, this, c, b, d, e, h, f);
+    return this.export(a, g, c + 1, d = 0);
   }
-  return g;
+  let e, f;
+  switch(d) {
+    case 0:
+      e = "reg";
+      f = qa(this.reg);
+      b = null;
+      break;
+    case 1:
+      e = "tag";
+      f = pa(this.tag);
+      b = null;
+      break;
+    case 2:
+      e = "doc";
+      f = oa(this.store);
+      b = null;
+      break;
+    case 3:
+      e = "cfg";
+      f = {};
+      b = null;
+      break;
+    default:
+      return;
+  }
+  return ra.call(this, a, b, e, c, d, f);
 };
 v.import = function(a, b) {
   if (b) {
     switch(G(b) && (b = JSON.parse(b)), a) {
       case "tag":
-        this.A = b;
         break;
       case "reg":
         this.fastupdate = !1;
-        this.reg = b;
+        this.reg = new Set(b);
         for (let d = 0, e; d < this.field.length; d++) {
-          e = this.index[this.field[d]], e.reg = b, e.fastupdate = !1;
+          e = this.index.get(this.field[d]), e.fastupdate = !1, e.reg = this.reg;
         }
         break;
-      case "store":
-        this.store = b;
+      case "doc":
+        this.store = new Map(b);
         break;
       default:
         a = a.split(".");
         const c = a[0];
         a = a[1];
-        c && a && this.index[c].import(a, b);
+        c && a && this.index.get(c).import(a, b);
     }
   }
 };
 na(T.prototype);
-function Da(a, b, c) {
+function Ga(a, b, c) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
   let d = this.cache.get(a);
   if (!d) {
@@ -1297,31 +1327,31 @@ U.prototype.clear = function() {
   this.cache.clear();
   this.h = "";
 };
-const Ea = {normalize:function(a) {
+const Ha = {normalize:function(a) {
   return a.toLowerCase();
 }, dedupe:!1};
-const Fa = 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 Ga = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), Ha = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
-const Ia = {a:"", e:"", i:"", o:"", u:"", y:"", b:1, f:1, p:1, v:1, c:2, g:2, j:2, k:2, q:2, s:2, x:2, z:2, "\u00df":2, d:3, t:3, l:4, m:5, n:5, r:6};
-const Ja = /[\x00-\x7F]+/g;
-const Ka = /[\x00-\x7F]+/g;
-const La = /[\x00-\x7F]+/g;
-var Ma = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:Ea, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:Fa}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:Fa, matcher:Ga, replacer:Ha}, LatinExtra:{normalize:!0, dedupe:!0, mapper:Fa, replacer:Ha.concat([/(?!^)[aeo]/g, ""]), matcher:Ga}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
+const Ia = 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 Ja = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), Ka = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
+const La = {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 Ma = /[\x00-\x7F]+/g;
+const Na = /[\x00-\x7F]+/g;
+const Oa = /[\x00-\x7F]+/g;
+var Pa = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:Ha, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:Ia}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:Ia, matcher:Ja, replacer:Ka}, LatinExtra:{normalize:!0, dedupe:!0, mapper:Ia, replacer:Ka.concat([/(?!^)[aeo]/g, ""]), matcher:Ja}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
   for (let c = 0; c < a.length; c++) {
     var b = a[c];
-    let d = b.charAt(0), e = Ia[d];
-    for (let f = 1, g; f < b.length && (g = b.charAt(f), "h" === g || "w" === g || !(g = Ia[g]) || g === e || (d += g, e = g, 4 !== d.length)); f++) {
+    let d = b.charAt(0), e = La[d];
+    for (let f = 1, g; f < b.length && (g = b.charAt(f), "h" === g || "w" === g || !(g = La[g]) || g === e || (d += g, e = g, 4 !== d.length)); f++) {
     }
     a[c] = d;
   }
 }}, ArabicDefault:{rtl:!0, normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(Ja, " ");
+  return ("" + a).replace(Ma, " ");
 }}, CjkDefault:{normalize:!1, dedupe:!0, split:"", prepare:function(a) {
-  return ("" + a).replace(Ka, "");
+  return ("" + a).replace(Na, "");
 }}, CyrillicDefault:{normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(La, " ");
+  return ("" + a).replace(Oa, " ");
 }}};
-const Na = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
+const Qa = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
 B();
 L.prototype.add = function(a, b, c, d) {
   if (b && (a || 0 === a)) {
@@ -1335,14 +1365,14 @@ L.prototype.add = function(a, b, c, d) {
         let t = b[this.rtl ? d - 1 - q : q];
         var e = t.length;
         if (e && (p || !m[t])) {
-          var f = this.score ? this.score(b, t, q, null, 0) : Oa(n, d, q), g = "";
+          var f = this.score ? this.score(b, t, q, null, 0) : Ra(n, d, q), g = "";
           switch(this.tokenize) {
             case "full":
               if (2 < e) {
                 for (f = 0; f < e; f++) {
                   for (var h = e; h > f; h--) {
                     g = t.substring(f, h);
-                    var k = this.score ? this.score(b, t, q, g, f) : Oa(n, d, q, e, f);
+                    var k = this.score ? this.score(b, t, q, g, f) : Ra(n, d, q, e, f);
                     V(this, m, g, k, a, c);
                   }
                 }
@@ -1351,7 +1381,7 @@ L.prototype.add = function(a, b, c, d) {
             case "reverse":
               if (1 < e) {
                 for (h = e - 1; 0 < h; h--) {
-                  g = t[h] + g, k = this.score ? this.score(b, t, q, g, h) : Oa(n, d, q, e, h), V(this, m, g, k, a, c);
+                  g = t[h] + g, k = this.score ? this.score(b, t, q, g, h) : Ra(n, d, q, e, h), V(this, m, g, k, a, c);
                 }
                 g = "";
               }
@@ -1367,7 +1397,7 @@ L.prototype.add = function(a, b, c, d) {
                 for (e = B(), g = this.R, f = t, h = Math.min(p + 1, d - q), e[f] = 1, k = 1; k < h; k++) {
                   if ((t = b[this.rtl ? d - 1 - q - k : q + k]) && !e[t]) {
                     e[t] = 1;
-                    const r = this.score ? this.score(b, f, q, t, k) : Oa(g + (d / 2 > g ? 0 : 1), d, q, h - 1, k - 1), u = this.bidirectional && t > f;
+                    const r = this.score ? this.score(b, f, q, t, k) : Ra(g + (d / 2 > g ? 0 : 1), d, q, h - 1, k - 1), u = this.bidirectional && t > f;
                     V(this, l, u ? f : t, r, a, c, u ? t : f);
                   }
                 }
@@ -1380,7 +1410,7 @@ L.prototype.add = function(a, b, c, d) {
       b = "";
     }
   }
-  this.db && (b || this.commit_task.push({del:a}), this.T && Pa(this));
+  this.db && (b || this.commit_task.push({del:a}), this.T && Sa(this));
   return this;
 };
 function V(a, b, c, d, e, f, g) {
@@ -1401,12 +1431,12 @@ function V(a, b, c, d, e, f, g) {
     }
   }
 }
-function Oa(a, b, c, d, e) {
+function Ra(a, b, c, d, e) {
   return c && 1 < a ? b + (d || 0) <= a ? c + (e || 0) : (a - 1) / (b + (d || 0)) * (c + (e || 0)) + 1 | 0 : 0;
 }
 ;function W(a, b, c, d) {
   if (1 === a.length) {
-    return a = a[0], a = c || a.length > b ? b ? a.slice(c, c + b) : a.slice(c) : a, d ? Qa(a) : a;
+    return a = a[0], a = c || a.length > b ? b ? a.slice(c, c + b) : a.slice(c) : a, d ? Ta(a) : a;
   }
   let e = [];
   for (let f = 0, g, h; f < a.length; f++) {
@@ -1422,7 +1452,7 @@ function Oa(a, b, c, d, e) {
         h > b && (g = g.slice(0, b), h = g.length), e.push(g);
       } else {
         if (h >= b) {
-          return h > b && (g = g.slice(0, b)), d ? Qa(g) : g;
+          return h > b && (g = g.slice(0, b)), d ? Ta(g) : g;
         }
         e = [g];
       }
@@ -1436,9 +1466,9 @@ function Oa(a, b, c, d, e) {
     return e;
   }
   e = 1 < e.length ? [].concat.apply([], e) : e[0];
-  return d ? Qa(e) : e;
+  return d ? Ta(e) : e;
 }
-function Qa(a) {
+function Ta(a) {
   for (let b = 0; b < a.length; b++) {
     a[b] = {score:b, id:a[b]};
   }
@@ -1488,19 +1518,19 @@ function Qa(a) {
   if (c.length) {
     return Promise.all(c).then(function() {
       a.result.length && (d = d.concat([a.result]));
-      a.result = Ra(d, e, f, g, h, a.F);
+      a.result = Ua(d, e, f, g, h, a.F);
       return h ? a.result : a;
     });
   }
-  d.length && (this.result.length && (d = d.concat([this.result])), this.result = Ra(d, e, f, g, h, this.F));
+  d.length && (this.result.length && (d = d.concat([this.result])), this.result = Ua(d, e, f, g, h, this.F));
   return h ? this.result : this;
 };
-function Ra(a, b, c, d, e, f) {
+function Ua(a, b, c, d, e, f) {
   if (!a.length) {
     return a;
   }
   "object" === typeof b && (c = b.offset || 0, d = b.enrich || !1, b = b.limit || 0);
-  return 2 > a.length ? e ? W(a[0], b, c, d) : a[0] : va(a, c, b, e, f);
+  return 2 > a.length ? e ? W(a[0], b, c, d) : a[0] : ya(a, c, b, e, f);
 }
 ;X.prototype.and = function() {
   if (this.result.length) {
@@ -1550,24 +1580,24 @@ function Ra(a, b, c, d, e, f) {
     if (a.length) {
       return Promise.all(a).then(function() {
         d = [b.result].concat(d);
-        b.result = Sa(d, e, f, g, b.F, h);
+        b.result = Va(d, e, f, g, b.F, h);
         return g ? b.result : b;
       });
     }
     d = [this.result].concat(d);
-    this.result = Sa(d, e, f, g, this.F, h);
+    this.result = Va(d, e, f, g, this.F, h);
     return g ? this.result : this;
   }
   return this;
 };
-function Sa(a, b, c, d, e, f) {
+function Va(a, b, c, d, e, f) {
   if (2 > a.length) {
     return [];
   }
   let g = [];
   B();
   let h = ca(a);
-  return h ? ua(a, h, b, c, f, e, d) : g;
+  return h ? xa(a, h, b, c, f, e, d) : g;
 }
 ;X.prototype.xor = function() {
   const a = this;
@@ -1613,14 +1643,14 @@ function Sa(a, b, c, d, e, f) {
   if (c.length) {
     return Promise.all(c).then(function() {
       a.result.length && (d = [a.result].concat(d));
-      a.result = Ta(d, e, f, g, !h, a.F);
+      a.result = Wa(d, e, f, g, !h, a.F);
       return h ? a.result : a;
     });
   }
-  d.length && (this.result.length && (d = [this.result].concat(d)), this.result = Ta(d, e, f, g, !h, a.F));
+  d.length && (this.result.length && (d = [this.result].concat(d)), this.result = Wa(d, e, f, g, !h, a.F));
   return h ? this.result : this;
 };
-function Ta(a, b, c, d, e, f) {
+function Wa(a, b, c, d, e, f) {
   if (!a.length) {
     return a;
   }
@@ -1714,14 +1744,14 @@ function Ta(a, b, c, d, e, f) {
   }
   if (c.length) {
     return Promise.all(c).then(function() {
-      a.result = Ua.call(a, d, e, f, g);
+      a.result = Xa.call(a, d, e, f, g);
       return g ? a.result : a;
     });
   }
-  d.length && (this.result = Ua.call(this, d, e, f, g));
+  d.length && (this.result = Xa.call(this, d, e, f, g));
   return g ? this.result : this;
 };
-function Ua(a, b, c, d) {
+function Xa(a, b, c, d) {
   if (!a.length) {
     return this.result;
   }
@@ -1751,7 +1781,7 @@ function Ua(a, b, c, d) {
   return e;
 }
 ;function X(a) {
-  if (!this) {
+  if (this.constructor !== X) {
     return new X(a);
   }
   if (a && a.index) {
@@ -1796,12 +1826,12 @@ X.prototype.boost = function(a) {
   return this;
 };
 X.prototype.resolve = function(a, b, c) {
-  Va = 1;
+  Ya = 1;
   const d = this.result;
   this.result = this.index = null;
   return d.length ? ("object" === typeof a && (c = a.enrich, b = a.offset, a = a.limit), W(d, a || 100, b, c)) : d;
 };
-let Va = 1;
+let Ya = 1;
 L.prototype.search = function(a, b, c) {
   c || (!b && H(a) ? (c = a, a = "") : H(b) && (c = b, b = 0));
   let d = [], e;
@@ -1812,22 +1842,22 @@ L.prototype.search = function(a, b, c) {
     g = c.offset || 0;
     var p = c.context;
     f = c.suggest;
-    (h = Va && !1 !== c.resolve) || (Va = 0);
+    (h = Ya && !1 !== c.resolve) || (Ya = 0);
     k = h && c.enrich;
     m = c.boost;
     l = this.db && c.tag;
   } else {
-    h = this.resolve || Va;
+    h = this.resolve || Ya;
   }
   a = this.encoder.encode(a);
   e = a.length;
   b || !h || (b = 100);
   if (1 === e) {
-    return Wa.call(this, a[0], "", b, g, h, k, l);
+    return Za.call(this, a[0], "", b, g, h, k, l);
   }
   p = this.depth && !1 !== p;
   if (2 === e && p && !f) {
-    return Wa.call(this, a[0], a[1], b, g, h, k, l);
+    return Za.call(this, a[0], a[1], b, g, h, k, l);
   }
   let n = c = 0;
   if (1 < e) {
@@ -1852,10 +1882,10 @@ L.prototype.search = function(a, b, c) {
   }
   let q = 0, t;
   if (1 === e) {
-    return Wa.call(this, a[0], "", b, g, h, k, l);
+    return Za.call(this, a[0], "", b, g, h, k, l);
   }
   if (2 === e && p && !f) {
-    return Wa.call(this, a[0], a[1], b, g, h, k, l);
+    return Za.call(this, a[0], a[1], b, g, h, k, l);
   }
   1 < e && (p ? (t = a[0], q = 1) : 9 < c && 3 < c / n && a.sort(aa));
   if (this.db) {
@@ -1866,7 +1896,7 @@ L.prototype.search = function(a, b, c) {
     return async function() {
       for (let u, x; q < e; q++) {
         x = a[q];
-        t ? (u = await Y(r, x, t, 0, 0, !1, !1), u = Xa(u, d, f, r.R), f && !1 === u && d.length || (t = x)) : (u = await Y(r, x, "", 0, 0, !1, !1), u = Xa(u, d, f, r.resolution));
+        t ? (u = await Y(r, x, t, 0, 0, !1, !1), u = $a(u, d, f, r.R), f && !1 === u && d.length || (t = x)) : (u = await Y(r, x, "", 0, 0, !1, !1), u = $a(u, d, f, r.resolution));
         if (u) {
           return u;
         }
@@ -1885,12 +1915,12 @@ L.prototype.search = function(a, b, c) {
           }
         }
       }
-      return h ? ua(d, r.resolution, b, g, f, m, h) : new X(d[0]);
+      return h ? xa(d, r.resolution, b, g, f, m, h) : new X(d[0]);
     }();
   }
   for (let r, u; q < e; q++) {
     u = a[q];
-    t ? (r = Y(this, u, t, 0, 0, !1, !1), r = Xa(r, d, f, this.R), f && !1 === r && d.length || (t = u)) : (r = Y(this, u, "", 0, 0, !1, !1), r = Xa(r, d, f, this.resolution));
+    t ? (r = Y(this, u, t, 0, 0, !1, !1), r = $a(r, d, f, this.R), f && !1 === r && d.length || (t = u)) : (r = Y(this, u, "", 0, 0, !1, !1), r = $a(r, d, f, this.resolution));
     if (r) {
       return r;
     }
@@ -1909,16 +1939,16 @@ L.prototype.search = function(a, b, c) {
       }
     }
   }
-  d = ua(d, this.resolution, b, g, f, m, h);
+  d = xa(d, this.resolution, b, g, f, m, h);
   return h ? d : new X(d);
 };
-function Wa(a, b, c, d, e, f, g) {
+function Za(a, b, c, d, e, f, g) {
   a = Y(this, a, b, c, d, e, f, g);
   return this.db ? a.then(function(h) {
     return e ? h : h && h.length ? e ? W(h, c, d) : new X(h) : e ? [] : new X([]);
   }) : a && a.length ? e ? W(a, c, d) : new X(a) : e ? [] : new X([]);
 }
-function Xa(a, b, c, d) {
+function $a(a, b, c, d) {
   let e = [];
   if (a) {
     d = Math.min(a.length, d);
@@ -1956,15 +1986,15 @@ function Y(a, b, c, d, e, f, g, h) {
         }
       }
     } else {
-      Ya(this.map, a), this.depth && Ya(this.ctx, a);
+      ab(this.map, a), this.depth && ab(this.ctx, a);
     }
     b || this.reg.delete(a);
   }
-  this.db && (this.commit_task.push({del:a}), this.T && Pa(this));
+  this.db && (this.commit_task.push({del:a}), this.T && Sa(this));
   this.cache && this.cache.remove(a);
   return this;
 };
-function Ya(a, b) {
+function ab(a, b) {
   let c = 0;
   if (a.constructor === Array) {
     for (let d = 0, e, f; d < a.length; d++) {
@@ -1979,24 +2009,24 @@ function Ya(a, b) {
     }
   } else {
     for (let d of a) {
-      const e = d[0], f = Ya(d[1], b);
+      const e = d[0], f = ab(d[1], b);
       f ? c += f : a.delete(e);
     }
   }
   return c;
 }
 ;function L(a, b) {
-  if (!this) {
+  if (this.constructor !== L) {
     return new L(a);
   }
   if (a) {
     var c = G(a) ? a : a.preset;
-    c && (Na[c] || console.warn("Preset not found: " + c), a = Object.assign({}, Na[c], a));
+    c && (Qa[c] || console.warn("Preset not found: " + c), a = Object.assign({}, Qa[c], a));
   } else {
     a = {};
   }
   c = a.context || {};
-  const d = G(a.encoder) ? Ma[a.encoder] : a.encode || a.encoder || Ea;
+  const d = G(a.encoder) ? Pa[a.encoder] : a.encode || a.encoder || Ha;
   this.encoder = d.encode ? d : "object" === typeof d ? new K(d) : {encode:d};
   let e;
   this.resolution = a.resolution || 9;
@@ -2033,7 +2063,7 @@ v.destroy = function() {
   this.commit_timer && (clearTimeout(this.commit_timer), this.commit_timer = null);
   return this.db.destroy();
 };
-function Pa(a) {
+function Sa(a) {
   a.commit_timer || (a.commit_timer = setTimeout(function() {
     a.commit_timer = null;
     a.db.commit(a, void 0, void 0);
@@ -2057,7 +2087,7 @@ v.update = function(a, b) {
   const c = this, d = this.remove(a);
   return d && d.then ? d.then(() => c.add(a, b)) : this.add(a, b);
 };
-function Za(a) {
+function bb(a) {
   let b = 0;
   if (a.constructor === Array) {
     for (let c = 0, d; c < a.length; c++) {
@@ -2065,7 +2095,7 @@ function Za(a) {
     }
   } else {
     for (const c of a) {
-      const d = c[0], e = Za(c[1]);
+      const d = c[0], e = bb(c[1]);
       e ? b += e : a.delete(d);
     }
   }
@@ -2075,63 +2105,47 @@ v.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
-  Za(this.map);
-  this.depth && Za(this.ctx);
+  bb(this.map);
+  this.depth && bb(this.ctx);
   return this;
 };
-v.searchCache = Da;
-v.export = function(a, b, c, d, e, f) {
-  let g = !0;
-  "undefined" === typeof f && (g = new Promise(l => {
-    f = l;
-  }));
-  let h, k;
-  switch(e || (e = 0)) {
+v.searchCache = Ga;
+v.export = function(a, b, c, d = 0) {
+  let e, f;
+  switch(d) {
     case 0:
-      h = "reg";
-      if (this.fastupdate) {
-        k = B();
-        for (let l of this.reg.keys()) {
-          k[l] = 1;
-        }
-      } else {
-        k = this.reg;
-      }
+      e = "reg";
+      f = qa(this.reg);
       break;
     case 1:
-      h = "cfg";
-      k = {doc:0, opt:this.h ? 1 : 0};
+      e = "cfg";
+      f = {};
       break;
     case 2:
-      h = "map";
-      k = this.map;
+      e = "map";
+      f = oa(this.map);
       break;
     case 3:
-      h = "ctx";
-      k = this.ctx;
+      e = "ctx";
+      f = pa(this.ctx);
       break;
     default:
-      "undefined" === typeof c && f && f();
       return;
   }
-  oa(a, b || this, c, h, d, e, k, f);
-  return g;
+  return ra.call(this, a, b, e, c, d, f);
 };
 v.import = function(a, b) {
   if (b) {
     switch(G(b) && (b = JSON.parse(b)), a) {
-      case "cfg":
-        this.h = !!b.opt;
-        break;
       case "reg":
         this.fastupdate = !1;
-        this.reg = b;
+        this.reg = new Set(b);
         break;
       case "map":
-        this.map = b;
+        this.map = new Map(b);
         break;
       case "ctx":
-        this.ctx = b;
+        this.ctx = new Map(b);
     }
   }
 };
@@ -2186,10 +2200,10 @@ v.serialize = function(a = !0) {
   return a ? "function inject(index){" + b + d + e + "}" : b + d + e;
 };
 na(L.prototype);
-const ab = "undefined" !== typeof window && (window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB), bb = ["map", "ctx", "tag", "reg", "cfg"];
-function cb(a, b = {}) {
+const db = "undefined" !== typeof window && (window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB), eb = ["map", "ctx", "tag", "reg", "cfg"];
+function fb(a, b = {}) {
   if (!this) {
-    return new cb(a, b);
+    return new fb(a, b);
   }
   "object" === typeof a && (b = a = a.name);
   a || console.info("Default storage space was used, because a name was not passed.");
@@ -2199,7 +2213,7 @@ function cb(a, b = {}) {
   this.db = null;
   this.h = {};
 }
-v = cb.prototype;
+v = fb.prototype;
 v.mount = function(a) {
   if (!a.encoder) {
     return a.mount(this);
@@ -2211,10 +2225,10 @@ v.open = function() {
   let a = this;
   navigator.storage && navigator.storage.persist();
   return this.db || new Promise(function(b, c) {
-    const d = ab.open(a.id + (a.field ? ":" + a.field : ""), 1);
+    const d = db.open(a.id + (a.field ? ":" + a.field : ""), 1);
     d.onupgradeneeded = function() {
       const e = a.db = this.result;
-      bb.forEach(f => {
+      eb.forEach(f => {
         e.objectStoreNames.contains(f) || e.createObjectStore(f);
       });
     };
@@ -2240,12 +2254,12 @@ v.close = function() {
   this.db = null;
 };
 v.destroy = function() {
-  return ab.deleteDatabase(this.id + (this.field ? ":" + this.field : ""));
+  return db.deleteDatabase(this.id + (this.field ? ":" + this.field : ""));
 };
 v.clear = function() {
-  const a = this.db.transaction(bb, "readwrite");
-  for (let b = 0; b < bb.length; b++) {
-    a.objectStore(bb[b]).clear();
+  const a = this.db.transaction(eb, "readwrite");
+  for (let b = 0; b < eb.length; b++) {
+    a.objectStore(eb[b]).clear();
   }
   return Z(a);
 };
@@ -2429,7 +2443,7 @@ v.commit = async function(a, b, c) {
     }
   }), a.map.clear(), a.ctx.clear(), a.tag && a.tag.clear(), a.store && a.store.clear(), a.document || a.reg.clear());
 };
-function db(a, b, c) {
+function gb(a, b, c) {
   const d = a.value;
   let e, f, g = 0;
   for (let h = 0, k; h < d.length; h++) {
@@ -2458,17 +2472,17 @@ v.remove = function(a) {
   return Promise.all([this.transaction("map", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       const c = this.result;
-      c && db(c, a);
+      c && gb(c, a);
     };
   }), this.transaction("ctx", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       const c = this.result;
-      c && db(c, a);
+      c && gb(c, a);
     };
   }), this.transaction("tag", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       const c = this.result;
-      c && db(c, a, !0);
+      c && gb(c, a, !0);
     };
   }), this.transaction("reg", "readwrite", function(b) {
     for (let c = 0; c < a.length; c++) {
@@ -2488,6 +2502,6 @@ function Z(a) {
     a = null;
   });
 }
-;export default {Index:L, Charset:Ma, Encoder:K, Document:T, Worker:N, Resolver:X, IndexedDB:cb, Language:{}};
+;export default {Index:L, Charset:Pa, Encoder:K, Document:T, Worker:N, Resolver:X, IndexedDB:fb, Language:{}};
 
-export const Index=L;export const  Charset=Ma;export const  Encoder=K;export const  Document=T;export const  Worker=N;export const  Resolver=X;export const  IndexedDB=cb;export const  Language={};
\ No newline at end of file
+export const Index=L;export const  Charset=Pa;export const  Encoder=K;export const  Document=T;export const  Worker=N;export const  Resolver=X;export const  IndexedDB=fb;export const  Language={};
\ No newline at end of file
diff --git a/dist/flexsearch.bundle.module.min.js b/dist/flexsearch.bundle.module.min.js
index 75dc11d..e131e54 100644
--- a/dist/flexsearch.bundle.module.min.js
+++ b/dist/flexsearch.bundle.module.min.js
@@ -12,7 +12,7 @@ function F(a){return"string"===typeof a}function G(a){return"object"===typeof a}
 "i"],["\u01d2","o"],["\u01d4","u"],["\u01d6","u"],["\u01d8","u"],["\u01da","u"],["\u01dc","u"],["\u01df","a"],["\u01e1","a"],["\u01e3","ae"],["\u00e6","ae"],["\u01fd","ae"],["\u01e7","g"],["\u01e9","k"],["\u01eb","o"],["\u01ed","o"],["\u01ef","\u0292"],["\u01f0","j"],["\u01f3","dz"],["\u01f5","g"],["\u01f9","n"],["\u01fb","a"],["\u01ff","\u00f8"],["\u0201","a"],["\u0203","a"],["\u0205","e"],["\u0207","e"],["\u0209","i"],["\u020b","i"],["\u020d","o"],["\u020f","o"],["\u0211","r"],["\u0213","r"],["\u0215",
 "u"],["\u0217","u"],["\u0219","s"],["\u021b","t"],["\u021f","h"],["\u0227","a"],["\u0229","e"],["\u022b","o"],["\u022d","o"],["\u022f","o"],["\u0231","o"],["\u0233","y"],["\u02b0","h"],["\u02b1","h"],["\u0266","h"],["\u02b2","j"],["\u02b3","r"],["\u02b4","\u0279"],["\u02b5","\u027b"],["\u02b6","\u0281"],["\u02b7","w"],["\u02b8","y"],["\u02e0","\u0263"],["\u02e1","l"],["\u02e2","s"],["\u02e3","x"],["\u02e4","\u0295"],["\u0390","\u03b9"],["\u03ac","\u03b1"],["\u03ad","\u03b5"],["\u03ae","\u03b7"],["\u03af",
 "\u03b9"],["\u03b0","\u03c5"],["\u03ca","\u03b9"],["\u03cb","\u03c5"],["\u03cc","\u03bf"],["\u03cd","\u03c5"],["\u03ce","\u03c9"],["\u03d0","\u03b2"],["\u03d1","\u03b8"],["\u03d2","\u03a5"],["\u03d3","\u03a5"],["\u03d4","\u03a5"],["\u03d5","\u03c6"],["\u03d6","\u03c0"],["\u03f0","\u03ba"],["\u03f1","\u03c1"],["\u03f2","\u03c2"],["\u03f5","\u03b5"],["\u0439","\u0438"],["\u0450","\u0435"],["\u0451","\u0435"],["\u0453","\u0433"],["\u0457","\u0456"],["\u045c","\u043a"],["\u045d","\u0438"],["\u045e","\u0443"],
-["\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 ea=/[^\p{L}\p{N}]+/u,fa=/(\d{3})/g,ha=/(\D)(\d{3})/g,ia=/(\d{3})(\D)/g,ja="".normalize&&/[\u0300-\u036f]/g;function K(a){if(!this)return new K(...arguments);for(let b=0;b<arguments.length;b++)this.assign(arguments[b])}
+["\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 ea=/[^\p{L}\p{N}]+/u,fa=/(\d{3})/g,ha=/(\D)(\d{3})/g,ia=/(\d{3})(\D)/g,ja="".normalize&&/[\u0300-\u036f]/g;function K(a){if(this.constructor!==K)return new K(...arguments);for(let b=0;b<arguments.length;b++)this.assign(arguments[b])}
 K.prototype.assign=function(a){this.normalize=z(a.normalize,!0,this.normalize);let b=a.include,c=b||a.exclude||a.split;if("object"===typeof c){let d=!b,e="";a.include||(e+="\\p{Z}");c.letter&&(e+="\\p{L}");c.number&&(e+="\\p{N}",d=!!b);c.symbol&&(e+="\\p{S}");c.punctuation&&(e+="\\p{P}");c.control&&(e+="\\p{C}");if(c=c.char)e+="object"===typeof c?c.join(""):c;try{this.split=new RegExp("["+(b?"^":"")+e+"]+","u")}catch(f){this.split=/\s+/}this.numeric=d}else{try{this.split=z(c,ea,this.split)}catch(d){this.split=
 /\s+/}this.numeric=z(this.numeric,!0)}this.prepare=z(a.prepare,null,this.prepare);this.finalize=z(a.finalize,null,this.finalize);ja||(this.mapper=new Map(da));this.rtl=a.rtl||!1;this.dedupe=z(a.dedupe,!0,this.dedupe);this.filter=z((c=a.filter)&&new Set(c),null,this.filter);this.matcher=z((c=a.matcher)&&new Map(c),null,this.matcher);this.mapper=z((c=a.mapper)&&new Map(c),null,this.mapper);this.stemmer=z((c=a.stemmer)&&new Map(c),null,this.stemmer);this.replacer=z(a.replacer,null,this.replacer);this.minlength=
 z(a.minlength,1,this.minlength);this.maxlength=z(a.maxlength,0,this.maxlength);if(this.cache=c=z(a.cache,!0,this.cache))this.L=null,this.S="number"===typeof c?c:2E5,this.H=new Map,this.J=new Map,this.A=this.h=128;this.B="";this.O=null;this.M="";this.P=null;if(this.matcher)for(const d of this.matcher.keys())this.B+=(this.B?"|":"")+d;if(this.stemmer)for(const d of this.stemmer.keys())this.M+=(this.M?"|":"")+d;return this};
@@ -20,72 +20,72 @@ K.prototype.encode=function(a){if(this.cache&&a.length<=this.h)if(this.L){if(thi
 let c=[],d=this.split||""===this.split?a.split(this.split):a;for(let f=0,g,h;f<d.length;f++){if(!(g=h=d[f]))continue;if(g.length<this.minlength)continue;if(b){c.push(g);continue}if(this.filter&&this.filter.has(g))continue;if(this.cache&&g.length<=this.A)if(this.L){var e=this.J.get(g);if(e||""===e){e&&c.push(e);continue}}else this.L=setTimeout(ka,50,this);let k;this.stemmer&&2<g.length&&(this.P||(this.P=new RegExp("(?!^)("+this.M+")$")),g=g.replace(this.P,l=>this.stemmer.get(l)),k=1);g&&k&&(g.length<
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-v.export=function(a,b,c,d,e,f){let g=!0;"undefined"===typeof f&&(g=new Promise(l=>{f=l}));let h,k;switch(e||(e=0)){case 0:h="reg";if(this.fastupdate){k=B();for(let l of this.reg.keys())k[l]=1}else k=this.reg;break;case 1:h="cfg";k={doc:0,opt:this.h?1:0};break;case 2:h="map";k=this.map;break;case 3:h="ctx";k=this.ctx;break;default:"undefined"===typeof c&&f&&f();return}oa(a,b||this,c,h,d,e,k,f);return g};
-v.import=function(a,b){if(b)switch(F(b)&&(b=JSON.parse(b)),a){case "cfg":this.h=!!b.opt;break;case "reg":this.fastupdate=!1;this.reg=b;break;case "map":this.map=b;break;case "ctx":this.ctx=b}};
+function cb(a){let b=0;if(a.constructor===Array)for(let c=0,d;c<a.length;c++)(d=a[c])&&(b+=d.length);else for(const c of a){const d=c[0],e=cb(c[1]);e?b+=e:a.delete(d)}return b}v.cleanup=function(){if(!this.fastupdate)return this;cb(this.map);this.depth&&cb(this.ctx);return this};v.searchCache=Ga;
+v.export=function(a,b,c,d=0){let e,f;switch(d){case 0:e="reg";f=qa(this.reg);break;case 1:e="cfg";f={};break;case 2:e="map";f=oa(this.map);break;case 3:e="ctx";f=pa(this.ctx);break;default:return}return ra.call(this,a,b,e,c,d,f)};v.import=function(a,b){if(b)switch(F(b)&&(b=JSON.parse(b)),a){case "reg":this.fastupdate=!1;this.reg=new Set(b);break;case "map":this.map=new Map(b);break;case "ctx":this.ctx=new Map(b)}};
 v.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,p;m<g.length;m++){p=g[m]||[""];var k="";for(var l=0;l<p.length;l++)k+=(k?",":"")+("string"===c?'"'+p[l]+'"':p[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 p of g.entries()){g=p[0];h=p[1];k="";for(let n=0,q;n<h.length;n++){q=h[n]||[""];l="";for(let r=0;r<q.length;r++)l+=(l?",":"")+("string"===c?'"'+q[r]+'"':q[r]);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};na(L.prototype);const ab="undefined"!==typeof window&&(window.indexedDB||window.mozIndexedDB||window.webkitIndexedDB||window.msIndexedDB),bb=["map","ctx","tag","reg","cfg"];
-function cb(a,b={}){if(!this)return new cb(a,b);"object"===typeof a&&(b=a=a.name);a||console.info("Default storage space was used, because a name was not passed.");this.id="flexsearch"+(a?":"+a.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"");this.field=b.field?b.field.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"";this.support_tag_search=!1;this.db=null;this.h={}}v=cb.prototype;v.mount=function(a){if(!a.encoder)return a.mount(this);a.db=this;return this.open()};
-v.open=function(){let a=this;navigator.storage&&navigator.storage.persist();return this.db||new Promise(function(b,c){const d=ab.open(a.id+(a.field?":"+a.field:""),1);d.onupgradeneeded=function(){const e=a.db=this.result;bb.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)}})};
-v.close=function(){this.db.close();this.db=null};v.destroy=function(){return ab.deleteDatabase(this.id+(this.field?":"+this.field:""))};v.clear=function(){const a=this.db.transaction(bb,"readwrite");for(let b=0;b<bb.length;b++)a.objectStore(bb[b]).clear();return Z(a)};
+m[0];g=m[1];for(const p of g.entries()){g=p[0];h=p[1];k="";for(let n=0,q;n<h.length;n++){q=h[n]||[""];l="";for(let r=0;r<q.length;r++)l+=(l?",":"")+("string"===c?'"'+q[r]+'"':q[r]);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};na(L.prototype);const db="undefined"!==typeof window&&(window.indexedDB||window.mozIndexedDB||window.webkitIndexedDB||window.msIndexedDB),eb=["map","ctx","tag","reg","cfg"];
+function fb(a,b={}){if(!this)return new fb(a,b);"object"===typeof a&&(b=a=a.name);a||console.info("Default storage space was used, because a name was not passed.");this.id="flexsearch"+(a?":"+a.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"");this.field=b.field?b.field.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"";this.support_tag_search=!1;this.db=null;this.h={}}v=fb.prototype;v.mount=function(a){if(!a.encoder)return a.mount(this);a.db=this;return this.open()};
+v.open=function(){let a=this;navigator.storage&&navigator.storage.persist();return this.db||new Promise(function(b,c){const d=db.open(a.id+(a.field?":"+a.field:""),1);d.onupgradeneeded=function(){const e=a.db=this.result;eb.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)}})};
+v.close=function(){this.db.close();this.db=null};v.destroy=function(){return db.deleteDatabase(this.id+(this.field?":"+this.field:""))};v.clear=function(){const a=this.db.transaction(eb,"readwrite");for(let b=0;b<eb.length;b++)a.objectStore(eb[b]).clear();return Z(a)};
 v.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 p=c?d+Math.min(m.length-d,c):m.length;for(let n=d;n<p;n++)k.push(m[n]);d=0;if(k.length===c)break}return f?g.enrich(k):k}return h})};
 v.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})};
 v.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})};v.has=function(a){a=this.db.transaction("reg","readonly").objectStore("reg").getKey(a);return Z(a)};v.search=null;v.info=function(){};
@@ -94,7 +94,7 @@ v.commit=async function(a,b,c){if(b)await this.clear(),a.commit_task=[];else{let
 for(let m=0,p,n;m<l;m++)if((n=g[m])&&n.length){if((p=h[m])&&p.length)for(k=0;k<n.length;k++)p.push(n[k]);else h[m]=n;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 p;if(m&&m.length){const n=Math.max(m.length,l.length);for(let q=0,r,t;q<n;q++)if((t=l[q])&&t.length){if((r=m[q])&&r.length)for(p=
 0;p<t.length;p++)r.push(t[p]);else m[q]=t;p=1}}else m=l,p=1;p&&d.put(m,f+":"+k)})}}}),a.store?await this.transaction("reg","readwrite",function(d){for(const e of a.store){const f=e[0],g=e[1];d.put("object"===typeof g?JSON.stringify(g):1,f)}}):a.bypass||await this.transaction("reg","readwrite",function(d){for(const e of a.reg.keys())d.put(1,e)}),a.tag&&await this.transaction("tag","readwrite",function(d){for(const e of a.tag){const f=e[0],g=e[1];g.length&&(d.get(f).onsuccess=function(){let h=this.result;
 h=h&&h.length?h.concat(g):g;d.put(h,f)})}}),a.map.clear(),a.ctx.clear(),a.tag&&a.tag.clear(),a.store&&a.store.clear(),a.document||a.reg.clear())};
-function db(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,p;l<b.length;l++)if(p=b[l],m=k.indexOf(f?parseInt(p,10):p),0>m&&!f&&"string"===typeof p&&!isNaN(p)&&(m=k.indexOf(parseInt(p,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()}
-v.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&&db(c,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&db(c,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&db(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:L,Charset:Ma,Encoder:K,Document:T,Worker:N,Resolver:X,IndexedDB:cb,Language:{}};
-export const Index=L;export const Charset=Ma;export const Encoder=K;export const Document=T;export const Worker=N;export const Resolver=X;export const IndexedDB=cb;export const Language={};
\ No newline at end of file
+function gb(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,p;l<b.length;l++)if(p=b[l],m=k.indexOf(f?parseInt(p,10):p),0>m&&!f&&"string"===typeof p&&!isNaN(p)&&(m=k.indexOf(parseInt(p,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()}
+v.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&&gb(c,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&gb(c,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&gb(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:L,Charset:Pa,Encoder:K,Document:T,Worker:N,Resolver:X,IndexedDB:fb,Language:{}};
+export const Index=L;export const Charset=Pa;export const Encoder=K;export const Document=T;export const Worker=N;export const Resolver=X;export const IndexedDB=fb;export const Language={};
\ No newline at end of file
diff --git a/dist/flexsearch.compact.debug.js b/dist/flexsearch.compact.debug.js
index 4f6ce03..da392ff 100644
--- a/dist/flexsearch.compact.debug.js
+++ b/dist/flexsearch.compact.debug.js
@@ -50,14 +50,14 @@ function C() {
 function aa(a, c) {
   return c.length - a.length;
 }
-function D(a) {
+function E(a) {
   return "string" === typeof a;
 }
 function H(a) {
   return "object" === typeof a;
 }
 function I(a, c) {
-  if (D(c)) {
+  if (E(c)) {
     a = a[c];
   } else {
     for (let b = 0; a && b < c.length; b++) {
@@ -75,15 +75,15 @@ function I(a, c) {
 "\u03b8"], ["\u03d2", "\u03a5"], ["\u03d3", "\u03a5"], ["\u03d4", "\u03a5"], ["\u03d5", "\u03c6"], ["\u03d6", "\u03c0"], ["\u03f0", "\u03ba"], ["\u03f1", "\u03c1"], ["\u03f2", "\u03c2"], ["\u03f5", "\u03b5"], ["\u0439", "\u0438"], ["\u0450", "\u0435"], ["\u0451", "\u0435"], ["\u0453", "\u0433"], ["\u0457", "\u0456"], ["\u045c", "\u043a"], ["\u045d", "\u0438"], ["\u045e", "\u0443"], ["\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 ca = /[^\p{L}\p{N}]+/u, da = /(\d{3})/g, ea = /(\D)(\d{3})/g, fa = /(\d{3})(\D)/g, J = "".normalize && /[\u0300-\u036f]/g;
-function L(a) {
-  if (!this) {
-    return new L(...arguments);
+function K(a) {
+  if (this.constructor !== K) {
+    return new K(...arguments);
   }
   for (let c = 0; c < arguments.length; c++) {
     this.assign(arguments[c]);
   }
 }
-L.prototype.assign = function(a) {
+K.prototype.assign = function(a) {
   this.normalize = B(a.normalize, !0, this.normalize);
   let c = a.include, b = c || a.exclude || a.split;
   if ("object" === typeof b) {
@@ -124,7 +124,7 @@ L.prototype.assign = function(a) {
   this.minlength = B(a.minlength, 1, this.minlength);
   this.maxlength = B(a.maxlength, 0, this.maxlength);
   if (this.cache = b = B(a.cache, !0, this.cache)) {
-    this.J = null, this.O = "number" === typeof b ? b : 2e5, this.F = new Map(), this.H = new Map(), this.D = this.h = 128;
+    this.I = null, this.O = "number" === typeof b ? b : 2e5, this.D = new Map(), this.G = new Map(), this.J = this.A = 128;
   }
   this.K = "";
   this.M = null;
@@ -142,14 +142,14 @@ L.prototype.assign = function(a) {
   }
   return this;
 };
-L.prototype.encode = function(a) {
-  if (this.cache && a.length <= this.h) {
-    if (this.J) {
-      if (this.F.has(a)) {
-        return this.F.get(a);
+K.prototype.encode = function(a) {
+  if (this.cache && a.length <= this.A) {
+    if (this.I) {
+      if (this.D.has(a)) {
+        return this.D.get(a);
       }
     } else {
-      this.J = setTimeout(ha, 50, this);
+      this.I = setTimeout(ha, 50, this);
     }
   }
   this.normalize && (a = "function" === typeof this.normalize ? this.normalize(a) : J ? a.normalize("NFKD").replace(J, "").toLowerCase() : a.toLowerCase());
@@ -171,15 +171,15 @@ L.prototype.encode = function(a) {
     if (this.filter && this.filter.has(g)) {
       continue;
     }
-    if (this.cache && g.length <= this.D) {
-      if (this.J) {
-        var d = this.H.get(g);
+    if (this.cache && g.length <= this.J) {
+      if (this.I) {
+        var d = this.G.get(g);
         if (d || "" === d) {
           d && b.push(d);
           continue;
         }
       } else {
-        this.J = setTimeout(ha, 50, this);
+        this.I = setTimeout(ha, 50, this);
       }
     }
     let k;
@@ -198,17 +198,17 @@ L.prototype.encode = function(a) {
         g = g.replace(this.replacer[d], this.replacer[d + 1]);
       }
     }
-    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));
+    this.cache && h.length <= this.J && (this.G.set(h, g), this.G.size > this.O && (this.G.clear(), this.J = this.J / 1.1 | 0));
     g && b.push(g);
   }
   this.finalize && (b = this.finalize(b) || b);
-  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));
+  this.cache && a.length <= this.A && (this.D.set(a, b), this.D.size > this.O && (this.D.clear(), this.A = this.A / 1.1 | 0));
   return b;
 };
 function ha(a) {
-  a.J = null;
-  a.F.clear();
-  a.H.clear();
+  a.I = null;
+  a.D.clear();
+  a.G.clear();
 }
 ;function ia(a) {
   M.call(a, "add");
@@ -228,12 +228,37 @@ function M(a) {
     return c;
   };
 }
-;function ja(a, c, b, e, d, f, g, h) {
-  (e = a(b ? b + "." + e : e, JSON.stringify(g))) && e.then ? e.then(function() {
-    c.export(a, c, b, d, f + 1, h);
-  }) : c.export(a, c, b, d, f + 1, h);
+;function N(a) {
+  const c = [];
+  for (const b of a.entries()) {
+    c.push(b);
+  }
+  return c;
 }
-;N.prototype.add = function(a, c, b) {
+function ja(a) {
+  const c = [];
+  for (const b of a.entries()) {
+    c.push(N(b));
+  }
+  return c;
+}
+function ka(a) {
+  const c = [];
+  for (const b of a.keys()) {
+    c.push(b);
+  }
+  return c;
+}
+function la(a, c, b, e, d, f) {
+  if ((b = a(c ? c + "." + b : b, JSON.stringify(f))) && b.then) {
+    const g = this;
+    return b.then(function() {
+      return g.export(a, c, e, d + 1);
+    });
+  }
+  return this.export(a, c, e, d + 1);
+}
+;O.prototype.add = function(a, c, b) {
   H(a) && (c = a, a = I(c, this.key));
   if (c && (a || 0 === a)) {
     if (!b && this.reg.has(a)) {
@@ -246,8 +271,8 @@ function M(a) {
         var d = k(c);
         d && e.add(a, d, !1, !0);
       } else {
-        if (d = k.G, !d || d(c)) {
-          k.constructor === String ? k = ["" + k] : D(k) && (k = [k]), O(c, k, this.I, 0, e, a, k[0], b);
+        if (d = k.F, !d || d(c)) {
+          k.constructor === String ? k = ["" + k] : E(k) && (k = [k]), P(c, k, this.H, 0, e, a, k[0], b);
         }
       }
     }
@@ -261,7 +286,7 @@ function M(a) {
             continue;
           }
         } else {
-          const k = f.G;
+          const k = f.F;
           if (k && !k(c)) {
             continue;
           }
@@ -269,7 +294,7 @@ function M(a) {
           f = I(c, f);
         }
         if (d && f) {
-          D(f) && (f = [f]);
+          E(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.reg.get(a)) ? g.push(m) : this.reg.set(a, [m]))));
           }
@@ -280,11 +305,11 @@ function M(a) {
     }
     if (this.store && (!b || !this.store.has(a))) {
       let h;
-      if (this.A) {
+      if (this.h) {
         h = C();
-        for (let k = 0, l; k < this.A.length; k++) {
-          l = this.A[k];
-          if ((b = l.G) && !b(c)) {
+        for (let k = 0, l; k < this.h.length; k++) {
+          l = this.h[k];
+          if ((b = l.F) && !b(c)) {
             continue;
           }
           let m;
@@ -294,11 +319,11 @@ function M(a) {
               continue;
             }
             l = [l.S];
-          } else if (D(l) || l.constructor === String) {
+          } else if (E(l) || l.constructor === String) {
             h[l] = c[l];
             continue;
           }
-          P(c, h, l, 0, l[0], m);
+          Q(c, h, l, 0, l[0], m);
         }
       }
       this.store.set(a, h || c);
@@ -306,21 +331,21 @@ function M(a) {
   }
   return this;
 };
-function P(a, c, b, e, d, f) {
+function Q(a, c, b, e, d, f) {
   a = a[d];
   if (e === b.length - 1) {
     c[d] = f || a;
   } else if (a) {
     if (a.constructor === Array) {
       for (c = c[d] = Array(a.length), d = 0; d < a.length; d++) {
-        P(a, c, b, e, d);
+        Q(a, c, b, e, d);
       }
     } else {
-      c = c[d] || (c[d] = C()), d = b[++e], P(a, c, b, e, d);
+      c = c[d] || (c[d] = C()), d = b[++e], Q(a, c, b, e, d);
     }
   }
 }
-function O(a, c, b, e, d, f, g, h) {
+function P(a, c, b, e, d, f, g, h) {
   if (a = a[g]) {
     if (e === c.length - 1) {
       if (a.constructor === Array) {
@@ -336,15 +361,15 @@ function O(a, c, b, e, d, f, g, h) {
     } else {
       if (a.constructor === Array) {
         for (g = 0; g < a.length; g++) {
-          O(a, c, b, e, d, f, g, h);
+          P(a, c, b, e, d, f, g, h);
         }
       } else {
-        g = c[++e], O(a, c, b, e, d, f, g, h);
+        g = c[++e], P(a, c, b, e, d, f, g, h);
       }
     }
   }
 }
-;function ka(a, c) {
+;function ma(a, c) {
   const b = C(), e = [];
   for (let d = 0, f; d < c.length; d++) {
     f = c[d];
@@ -357,7 +382,7 @@ function O(a, c, b, e, d, f, g, h) {
   }
   return e;
 }
-;N.prototype.search = function(a, c, b, e) {
+;O.prototype.search = function(a, c, b, e) {
   b || (!c && H(a) ? (b = a, a = "") : H(c) && (b = c, c = 0));
   let d = [];
   var f = [];
@@ -380,7 +405,7 @@ function O(a, c, b, e, d, f, g, h) {
       var u = [];
       for (let w = 0, q; w < m.length; w++) {
         q = m[w];
-        if (D(q)) {
+        if (E(q)) {
           throw Error("A tag option can't be a string, instead it needs a { field: tag } format.");
         }
         if (q.field && q.tag) {
@@ -394,8 +419,8 @@ function O(a, c, b, e, d, f, g, h) {
           }
         } else {
           v = Object.keys(q);
-          for (let E = 0, A, z; E < v.length; E++) {
-            if (A = v[E], z = q[A], z.constructor === Array) {
+          for (let D = 0, A, z; D < v.length; D++) {
+            if (A = v[D], z = q[A], z.constructor === Array) {
               for (y = 0; y < z.length; y++) {
                 u.push(A, z[y]);
               }
@@ -413,7 +438,7 @@ function O(a, c, b, e, d, f, g, h) {
         e = [];
         if (u.length) {
           for (f = 0; f < u.length; f += 2) {
-            r = la.call(this, u[f], u[f + 1], c, n, g), d.push({field:u[f], tag:u[f + 1], result:r});
+            r = na.call(this, u[f], u[f + 1], c, n, g), d.push({field:u[f], tag:u[f + 1], result:r});
           }
         }
         return e.length ? Promise.all(e).then(function(w) {
@@ -424,18 +449,18 @@ function O(a, c, b, e, d, f, g, h) {
         }) : d;
       }
     }
-    D(l) && (l = [l]);
+    E(l) && (l = [l]);
   }
   l || (l = this.field);
   u = !e && (this.worker || this.db) && [];
-  for (let w = 0, q, E, A; w < l.length; w++) {
-    E = l[w];
+  for (let w = 0, q, D, A; w < l.length; w++) {
+    D = l[w];
     let z;
-    D(E) || (z = E, E = z.field, a = z.query || a, c = z.limit || c, n = z.offset || n, k = z.suggest || k, g = this.store && (z.enrich || g));
+    E(D) || (z = D, D = z.field, a = z.query || a, c = z.limit || c, n = z.offset || n, k = z.suggest || k, g = this.store && (z.enrich || g));
     if (e) {
       q = e[w];
     } else {
-      if (v = z || b, y = this.index.get(E), m && (v.enrich = !1), u) {
+      if (v = z || b, y = this.index.get(D), m && (v.enrich = !1), u) {
         u[w] = y.search(a, c, v);
         v && g && (v.enrich = g);
         continue;
@@ -447,7 +472,7 @@ function O(a, c, b, e, d, f, g, h) {
     if (m && A) {
       v = [];
       y = 0;
-      for (let G = 0, F, K; G < m.length; G += 2) {
+      for (let G = 0, F, L; G < m.length; G += 2) {
         F = this.tag.get(m[G]);
         if (!F) {
           if (console.warn("Tag '" + m[G] + ":" + m[G + 1] + "' will be skipped because there is no field '" + m[G] + "'."), k) {
@@ -456,14 +481,14 @@ function O(a, c, b, e, d, f, g, h) {
             return d;
           }
         }
-        if (K = (F = F && F.get(m[G + 1])) && F.length) {
+        if (L = (F = F && F.get(m[G + 1])) && F.length) {
           y++, v.push(F);
         } else if (!k) {
           return d;
         }
       }
       if (y) {
-        q = ka(q, v);
+        q = ma(q, v);
         A = q.length;
         if (!A && !k) {
           return d;
@@ -472,7 +497,7 @@ function O(a, c, b, e, d, f, g, h) {
       }
     }
     if (A) {
-      f[t] = E, d.push(q), t++;
+      f[t] = D, d.push(q), t++;
     } else if (1 === l.length) {
       return d;
     }
@@ -492,15 +517,15 @@ function O(a, c, b, e, d, f, g, h) {
   u = [];
   for (let w = 0, q; w < f.length; w++) {
     q = d[w];
-    g && q.length && !q[0].doc && q.length && (q = ma.call(this, q));
+    g && q.length && !q[0].doc && q.length && (q = oa.call(this, q));
     if (r) {
       return q;
     }
     d[w] = {field:f[w], result:q};
   }
-  return h ? na(d, c) : p ? oa(d, a, this.index, this.field, this.C, p) : d;
+  return h ? pa(d, c) : p ? qa(d, a, this.index, this.field, this.C, p) : d;
 };
-function oa(a, c, b, e, d, f) {
+function qa(a, c, b, e, d, f) {
   let g, h, k;
   for (let m = 0, n, t, p, r, u; m < a.length; m++) {
     n = a[m].result;
@@ -515,21 +540,21 @@ function oa(a, c, b, e, d, f) {
       var l = I(n[v].doc, u);
       let w = g.encode(l);
       l = l.split(g.split);
-      for (let q = 0, E, A; q < w.length; q++) {
-        E = w[q];
+      for (let q = 0, D, A; q < w.length; q++) {
+        D = w[q];
         A = l[q];
         let z;
         for (let G = 0, F; G < h.length; G++) {
           if (F = h[G], "strict" === k) {
-            if (E === F) {
+            if (D === F) {
               y += (y ? " " : "") + f.replace("$1", A);
               z = !0;
               break;
             }
           } else {
-            const K = E.indexOf(F);
-            if (-1 < K) {
-              y += (y ? " " : "") + A.substring(0, K) + f.replace("$1", A.substring(K, F.length)) + A.substring(K + F.length);
+            const L = D.indexOf(F);
+            if (-1 < L) {
+              y += (y ? " " : "") + A.substring(0, L) + f.replace("$1", A.substring(L, F.length)) + A.substring(L + F.length);
               z = !0;
               break;
             }
@@ -542,7 +567,7 @@ function oa(a, c, b, e, d, f) {
   }
   return a;
 }
-function na(a, c) {
+function pa(a, c) {
   const b = [], e = C();
   for (let d = 0, f, g; d < a.length; d++) {
     f = a[d];
@@ -561,7 +586,7 @@ function na(a, c) {
   }
   return b;
 }
-function la(a, c, b, e, d) {
+function na(a, c, b, e, d) {
   let f = this.tag.get(a);
   if (!f) {
     return console.warn("Tag '" + a + "' was not found"), [];
@@ -570,43 +595,43 @@ function la(a, c, b, e, d) {
     if (a > b || e) {
       f = f.slice(e, e + b);
     }
-    d && (f = ma.call(this, f));
+    d && (f = oa.call(this, f));
     return f;
   }
 }
-function ma(a) {
+function oa(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 N(a) {
-  if (!this) {
-    return new N(a);
+;function O(a) {
+  if (this.constructor !== O) {
+    return new O(a);
   }
   const c = a.document || a.doc || a;
   var b;
   this.C = [];
   this.field = [];
-  this.I = [];
-  this.key = (b = c.key || c.id) && Q(b, this.I) || "id";
+  this.H = [];
+  this.key = (b = c.key || c.id) && R(b, this.H) || "id";
   this.reg = (this.fastupdate = !!a.fastupdate) ? new Map() : new Set();
-  this.A = (b = c.store || null) && !0 !== b && [];
+  this.h = (b = c.store || null) && !0 !== b && [];
   this.store = b && new Map();
-  this.cache = (b = a.cache || null) && new R(b);
+  this.cache = (b = a.cache || null) && new S(b);
   a.cache = !1;
   b = new Map();
   let e = c.index || c.field || c;
-  D(e) && (e = [e]);
+  E(e) && (e = [e]);
   for (let d = 0, f, g; d < e.length; d++) {
-    f = e[d], D(f) || (g = f, f = f.field), g = H(g) ? Object.assign({}, a, g) : a, b.set(f, new S(g, this.reg)), g.custom ? this.C[d] = g.custom : (this.C[d] = Q(f, this.I), g.filter && ("string" === typeof this.C[d] && (this.C[d] = new String(this.C[d])), this.C[d].G = g.filter)), this.field[d] = f;
+    f = e[d], E(f) || (g = f, f = f.field), g = H(g) ? Object.assign({}, a, g) : a, b.set(f, new T(g, this.reg)), g.custom ? this.C[d] = g.custom : (this.C[d] = R(f, this.H), g.filter && ("string" === typeof this.C[d] && (this.C[d] = new String(this.C[d])), this.C[d].F = g.filter)), this.field[d] = f;
   }
-  if (this.A) {
+  if (this.h) {
     a = c.store;
-    D(a) && (a = [a]);
+    E(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] = Q(g, this.I), f.filter && ("string" === typeof this.A[d] && (this.A[d] = new String(this.A[d])), this.A[d].G = f.filter));
+      f = a[d], g = f.field || f, f.custom ? (this.h[d] = f.custom, f.custom.S = g) : (this.h[d] = R(g, this.H), f.filter && ("string" === typeof this.h[d] && (this.h[d] = new String(this.h[d])), this.h[d].F = f.filter));
     }
   }
   this.index = b;
@@ -622,14 +647,14 @@ function ma(a) {
         if (!g) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
-        f.custom ? this.B[d] = f.custom : (this.B[d] = Q(g, this.I), f.filter && ("string" === typeof this.B[d] && (this.B[d] = new String(this.B[d])), this.B[d].G = f.filter));
+        f.custom ? this.B[d] = f.custom : (this.B[d] = R(g, this.H), f.filter && ("string" === typeof this.B[d] && (this.B[d] = new String(this.B[d])), this.B[d].F = f.filter));
         this.R[d] = g;
         this.tag.set(g, new Map());
       }
     }
   }
 }
-function Q(a, c) {
+function R(a, c) {
   const b = a.split(":");
   let e = 0;
   for (let d = 0; d < b.length; d++) {
@@ -638,7 +663,7 @@ function Q(a, c) {
   e < b.length && (b.length = e);
   return 1 < e ? b : b[0];
 }
-x = N.prototype;
+x = O.prototype;
 x.append = function(a, c) {
   return this.add(a, c, !0);
 };
@@ -694,65 +719,70 @@ x.set = function(a, c) {
   this.store.set(a, c);
   return this;
 };
-x.searchCache = pa;
-x.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;
+x.searchCache = ra;
+x.export = function(a, c, b = 0, e = 0) {
+  if (b < this.field.length) {
+    const g = this.field[b];
+    if ((c = this.index.get(g).export(a, g, b, e = 1)) && c.then) {
+      const h = this;
+      return c.then(function() {
+        return h.export(a, g, b + 1, e = 0);
+      });
     }
-    ja(a, this, b, c, e, d, h, f);
+    return this.export(a, g, b + 1, e = 0);
   }
-  return g;
+  let d, f;
+  switch(e) {
+    case 0:
+      d = "reg";
+      f = ka(this.reg);
+      c = null;
+      break;
+    case 1:
+      d = "tag";
+      f = ja(this.tag);
+      c = null;
+      break;
+    case 2:
+      d = "doc";
+      f = N(this.store);
+      c = null;
+      break;
+    case 3:
+      d = "cfg";
+      f = {};
+      c = null;
+      break;
+    default:
+      return;
+  }
+  return la.call(this, a, c, d, b, e, f);
 };
 x.import = function(a, c) {
   if (c) {
-    switch(D(c) && (c = JSON.parse(c)), a) {
+    switch(E(c) && (c = JSON.parse(c)), a) {
       case "tag":
-        this.D = c;
         break;
       case "reg":
         this.fastupdate = !1;
-        this.reg = c;
+        this.reg = new Set(c);
         for (let e = 0, d; e < this.field.length; e++) {
-          d = this.index[this.field[e]], d.reg = c, d.fastupdate = !1;
+          d = this.index.get(this.field[e]), d.fastupdate = !1, d.reg = this.reg;
         }
         break;
-      case "store":
-        this.store = c;
+      case "doc":
+        this.store = new Map(c);
         break;
       default:
         a = a.split(".");
         const b = a[0];
         a = a[1];
-        b && a && this.index[b].import(a, c);
+        b && a && this.index.get(b).import(a, c);
     }
   }
 };
-ia(N.prototype);
-function pa(a, c, b) {
+ia(O.prototype);
+function ra(a, c, b) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
   let e = this.cache.get(a);
   if (!e) {
@@ -768,57 +798,57 @@ function pa(a, c, b) {
   }
   return e;
 }
-function R(a) {
+function S(a) {
   this.limit = a && !0 !== a ? a : 1000;
   this.cache = new Map();
-  this.h = "";
+  this.A = "";
 }
-R.prototype.set = function(a, c) {
-  this.cache.set(this.h = a, c);
+S.prototype.set = function(a, c) {
+  this.cache.set(this.A = a, c);
   this.cache.size > this.limit && this.cache.delete(this.cache.keys().next().value);
 };
-R.prototype.get = function(a) {
+S.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.A !== a && (this.cache.delete(a), this.cache.set(this.A = a, c));
   return c;
 };
-R.prototype.remove = function(a) {
+S.prototype.remove = function(a) {
   for (const c of this.cache) {
     const b = c[0];
     c[1].includes(a) && this.cache.delete(b);
   }
 };
-R.prototype.clear = function() {
+S.prototype.clear = function() {
   this.cache.clear();
-  this.h = "";
+  this.A = "";
 };
-const qa = {normalize:function(a) {
+const sa = {normalize:function(a) {
   return a.toLowerCase();
 }, dedupe:!1};
-const T = 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 ra = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), sa = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
-const ta = {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 ua = /[\x00-\x7F]+/g;
-const va = /[\x00-\x7F]+/g;
+const U = 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 ta = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), ua = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
+const va = {a:"", e:"", i:"", o:"", u:"", y:"", b:1, f:1, p:1, v:1, c:2, g:2, j:2, k:2, q:2, s:2, x:2, z:2, "\u00df":2, d:3, t:3, l:4, m:5, n:5, r:6};
 const wa = /[\x00-\x7F]+/g;
-var xa = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:qa, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:T}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:T, matcher:ra, replacer:sa}, LatinExtra:{normalize:!0, dedupe:!0, mapper:T, replacer:sa.concat([/(?!^)[aeo]/g, ""]), matcher:ra}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
+const xa = /[\x00-\x7F]+/g;
+const ya = /[\x00-\x7F]+/g;
+var za = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:sa, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:U}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:U, matcher:ta, replacer:ua}, LatinExtra:{normalize:!0, dedupe:!0, mapper:U, replacer:ua.concat([/(?!^)[aeo]/g, ""]), matcher:ta}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
   for (let b = 0; b < a.length; b++) {
     var c = a[b];
-    let e = c.charAt(0), d = ta[e];
-    for (let f = 1, g; f < c.length && (g = c.charAt(f), "h" === g || "w" === g || !(g = ta[g]) || g === d || (e += g, d = g, 4 !== e.length)); f++) {
+    let e = c.charAt(0), d = va[e];
+    for (let f = 1, g; f < c.length && (g = c.charAt(f), "h" === g || "w" === g || !(g = va[g]) || g === d || (e += g, d = g, 4 !== e.length)); f++) {
     }
     a[b] = e;
   }
 }}, ArabicDefault:{rtl:!0, normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(ua, " ");
-}}, CjkDefault:{normalize:!1, dedupe:!0, split:"", prepare:function(a) {
-  return ("" + a).replace(va, "");
-}}, CyrillicDefault:{normalize:!1, dedupe:!0, prepare:function(a) {
   return ("" + a).replace(wa, " ");
+}}, CjkDefault:{normalize:!1, dedupe:!0, split:"", prepare:function(a) {
+  return ("" + a).replace(xa, "");
+}}, CyrillicDefault:{normalize:!1, dedupe:!0, prepare:function(a) {
+  return ("" + a).replace(ya, " ");
 }}};
-const ya = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
+const Aa = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
 C();
-S.prototype.add = function(a, c, b, e) {
+T.prototype.add = function(a, c, b, e) {
   if (c && (a || 0 === a)) {
     if (!e && !b && this.reg.has(a)) {
       return this.update(a, c);
@@ -830,15 +860,15 @@ S.prototype.add = function(a, c, b, e) {
         let r = c[this.rtl ? e - 1 - p : p];
         var d = r.length;
         if (d && (n || !m[r])) {
-          var f = this.score ? this.score(c, r, p, null, 0) : U(t, e, p), g = "";
+          var f = this.score ? this.score(c, r, p, null, 0) : V(t, e, p), g = "";
           switch(this.tokenize) {
             case "full":
               if (2 < d) {
                 for (f = 0; f < d; f++) {
                   for (var h = d; h > f; h--) {
                     g = r.substring(f, h);
-                    var k = this.score ? this.score(c, r, p, g, f) : U(t, e, p, d, f);
-                    V(this, m, g, k, a, b);
+                    var k = this.score ? this.score(c, r, p, g, f) : V(t, e, p, d, f);
+                    W(this, m, g, k, a, b);
                   }
                 }
                 break;
@@ -846,24 +876,24 @@ S.prototype.add = function(a, c, b, e) {
             case "reverse":
               if (1 < d) {
                 for (h = d - 1; 0 < h; h--) {
-                  g = r[h] + g, k = this.score ? this.score(c, r, p, g, h) : U(t, e, p, d, h), V(this, m, g, k, a, b);
+                  g = r[h] + g, k = this.score ? this.score(c, r, p, g, h) : V(t, e, p, d, h), W(this, m, g, k, a, b);
                 }
                 g = "";
               }
             case "forward":
               if (1 < d) {
                 for (h = 0; h < d; h++) {
-                  g += r[h], V(this, m, g, f, a, b);
+                  g += r[h], W(this, m, g, f, a, b);
                 }
                 break;
               }
             default:
-              if (V(this, m, r, f, a, b), n && 1 < e && p < e - 1) {
+              if (W(this, m, r, f, a, b), n && 1 < e && p < e - 1) {
                 for (d = C(), g = this.P, f = r, h = Math.min(n + 1, e - p), d[f] = 1, k = 1; k < h; k++) {
                   if ((r = c[this.rtl ? e - 1 - p - k : p + k]) && !d[r]) {
                     d[r] = 1;
-                    const u = this.score ? this.score(c, f, p, r, k) : U(g + (e / 2 > g ? 0 : 1), e, p, h - 1, k - 1), v = this.bidirectional && r > f;
-                    V(this, l, v ? f : r, u, a, b, v ? r : f);
+                    const u = this.score ? this.score(c, f, p, r, k) : V(g + (e / 2 > g ? 0 : 1), e, p, h - 1, k - 1), v = this.bidirectional && r > f;
+                    W(this, l, v ? f : r, u, a, b, v ? r : f);
                   }
                 }
               }
@@ -875,16 +905,16 @@ S.prototype.add = function(a, c, b, e) {
   }
   return this;
 };
-function V(a, c, b, e, d, f, g) {
+function W(a, c, b, e, d, f, g) {
   let h = g ? a.ctx : a.map, k;
   if (!c[b] || g && !(k = c[b])[g]) {
     g ? (c = k || (c[b] = C()), 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 U(a, c, b, e, d) {
+function V(a, c, b, e, d) {
   return b && 1 < a ? c + (e || 0) <= a ? b + (d || 0) : (a - 1) / (c + (e || 0)) * (b + (d || 0)) + 1 | 0 : 0;
 }
-;function za(a, c, b) {
+;function Ba(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;
   }
@@ -914,7 +944,7 @@ function U(a, c, b, e, d) {
   }
   return e.length ? e = 1 < e.length ? [].concat.apply([], e) : e[0] : e;
 }
-;S.prototype.search = function(a, c, b) {
+;T.prototype.search = function(a, c, b) {
   b || (!c && H(a) ? (b = a, a = "") : H(c) && (b = c, c = 0));
   var e = [], d = 0;
   if (b) {
@@ -928,11 +958,11 @@ function U(a, c, b, e, d) {
   b = a.length;
   c || (c = 100);
   if (1 === b) {
-    return W.call(this, a[0], "", c, d);
+    return X.call(this, a[0], "", c, d);
   }
   f = this.depth && !1 !== f;
   if (2 === b && f && !g) {
-    return W.call(this, a[0], a[1], c, d);
+    return X.call(this, a[0], a[1], c, d);
   }
   var h = 0, k = 0;
   if (1 < b) {
@@ -940,7 +970,7 @@ function U(a, c, b, e, d) {
     const n = [];
     for (let t = 0, p; t < b; t++) {
       if ((p = a[t]) && !l[p]) {
-        if (g || X(this, p)) {
+        if (g || Y(this, p)) {
           n.push(p), l[p] = 1;
         } else {
           return e;
@@ -958,10 +988,10 @@ function U(a, c, b, e, d) {
   }
   l = 0;
   if (1 === b) {
-    return W.call(this, a[0], "", c, d);
+    return X.call(this, a[0], "", c, d);
   }
   if (2 === b && f && !g) {
-    return W.call(this, a[0], a[1], c, d);
+    return X.call(this, a[0], a[1], c, d);
   }
   if (1 < b) {
     if (f) {
@@ -973,7 +1003,7 @@ function U(a, c, b, e, d) {
   }
   for (let n, t; l < b; l++) {
     t = a[l];
-    m ? (n = X(this, t, m), n = Aa(n, e, g, this.P), g && !1 === n && e.length || (m = t)) : (n = X(this, t, ""), n = Aa(n, e, g, this.resolution));
+    m ? (n = Y(this, t, m), n = Ca(n, e, g, this.P), g && !1 === n && e.length || (m = t)) : (n = Y(this, t, ""), n = Ca(n, e, g, this.resolution));
     if (n) {
       return n;
     }
@@ -988,7 +1018,7 @@ function U(a, c, b, e, d) {
         return e;
       }
       if (1 === f) {
-        return za(e[0], c, d);
+        return Ba(e[0], c, d);
       }
     }
   }
@@ -1047,10 +1077,10 @@ function U(a, c, b, e, d) {
   }
   return e;
 };
-function W(a, c, b, e) {
-  return (a = X(this, a, c)) && a.length ? za(a, b, e) : [];
+function X(a, c, b, e) {
+  return (a = Y(this, a, c)) && a.length ? Ba(a, b, e) : [];
 }
-function Aa(a, c, b, e) {
+function Ca(a, c, b, e) {
   let d = [];
   if (a) {
     e = Math.min(a.length, e);
@@ -1064,13 +1094,13 @@ function Aa(a, c, b, e) {
   }
   return !b && d;
 }
-function X(a, c, b) {
+function Y(a, c, b) {
   let e;
   b && (e = a.bidirectional && c > b);
   a = b ? (a = a.ctx.get(e ? c : b)) && a.get(e ? b : c) : a.map.get(c);
   return a;
 }
-;S.prototype.remove = function(a, c) {
+;T.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) {
@@ -1085,14 +1115,14 @@ function X(a, c, b) {
         }
       }
     } else {
-      Y(this.map, a), this.depth && Y(this.ctx, a);
+      Da(this.map, a), this.depth && Da(this.ctx, a);
     }
     c || this.reg.delete(a);
   }
   this.cache && this.cache.remove(a);
   return this;
 };
-function Y(a, c) {
+function Da(a, c) {
   let b = 0;
   if (a.constructor === Array) {
     for (let e = 0, d, f; e < a.length; e++) {
@@ -1107,25 +1137,25 @@ function Y(a, c) {
     }
   } else {
     for (let e of a) {
-      const d = e[0], f = Y(e[1], c);
+      const d = e[0], f = Da(e[1], c);
       f ? b += f : a.delete(d);
     }
   }
   return b;
 }
-;function S(a, c) {
-  if (!this) {
-    return new S(a);
+;function T(a, c) {
+  if (this.constructor !== T) {
+    return new T(a);
   }
   if (a) {
-    var b = D(a) ? a : a.preset;
-    b && (ya[b] || console.warn("Preset not found: " + b), a = Object.assign({}, ya[b], a));
+    var b = E(a) ? a : a.preset;
+    b && (Aa[b] || console.warn("Preset not found: " + b), a = Object.assign({}, Aa[b], a));
   } else {
     a = {};
   }
   b = a.context || {};
-  const e = D(a.encoder) ? xa[a.encoder] : a.encode || a.encoder || qa;
-  this.encoder = e.encode ? e : "object" === typeof e ? new L(e) : {encode:e};
+  const e = E(a.encoder) ? za[a.encoder] : a.encode || a.encoder || sa;
+  this.encoder = e.encode ? e : "object" === typeof e ? new K(e) : {encode:e};
   let d;
   this.resolution = a.resolution || 9;
   this.tokenize = d = a.tokenize || "strict";
@@ -1139,9 +1169,9 @@ function Y(a, c) {
   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 R(d);
+  this.cache = (d = a.cache || null) && new S(d);
 }
-x = S.prototype;
+x = T.prototype;
 x.clear = function() {
   this.map.clear();
   this.ctx.clear();
@@ -1159,7 +1189,7 @@ x.update = function(a, c) {
   const b = this, e = this.remove(a);
   return e && e.then ? e.then(() => b.add(a, c)) : this.add(a, c);
 };
-function Ba(a) {
+function Ea(a) {
   let c = 0;
   if (a.constructor === Array) {
     for (let b = 0, e; b < a.length; b++) {
@@ -1167,7 +1197,7 @@ function Ba(a) {
     }
   } else {
     for (const b of a) {
-      const e = b[0], d = Ba(b[1]);
+      const e = b[0], d = Ea(b[1]);
       d ? c += d : a.delete(e);
     }
   }
@@ -1177,63 +1207,47 @@ x.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
-  Ba(this.map);
-  this.depth && Ba(this.ctx);
+  Ea(this.map);
+  this.depth && Ea(this.ctx);
   return this;
 };
-x.searchCache = pa;
-x.export = function(a, c, b, e, d, f) {
-  let g = !0;
-  "undefined" === typeof f && (g = new Promise(l => {
-    f = l;
-  }));
-  let h, k;
-  switch(d || (d = 0)) {
+x.searchCache = ra;
+x.export = function(a, c, b, e = 0) {
+  let d, f;
+  switch(e) {
     case 0:
-      h = "reg";
-      if (this.fastupdate) {
-        k = C();
-        for (let l of this.reg.keys()) {
-          k[l] = 1;
-        }
-      } else {
-        k = this.reg;
-      }
+      d = "reg";
+      f = ka(this.reg);
       break;
     case 1:
-      h = "cfg";
-      k = {doc:0, opt:this.h ? 1 : 0};
+      d = "cfg";
+      f = {};
       break;
     case 2:
-      h = "map";
-      k = this.map;
+      d = "map";
+      f = N(this.map);
       break;
     case 3:
-      h = "ctx";
-      k = this.ctx;
+      d = "ctx";
+      f = ja(this.ctx);
       break;
     default:
-      "undefined" === typeof b && f && f();
       return;
   }
-  ja(a, c || this, b, h, e, d, k, f);
-  return g;
+  return la.call(this, a, c, d, b, e, f);
 };
 x.import = function(a, c) {
   if (c) {
-    switch(D(c) && (c = JSON.parse(c)), a) {
-      case "cfg":
-        this.h = !!c.opt;
-        break;
+    switch(E(c) && (c = JSON.parse(c)), a) {
       case "reg":
         this.fastupdate = !1;
-        this.reg = c;
+        this.reg = new Set(c);
         break;
       case "map":
-        this.map = c;
+        this.map = new Map(c);
         break;
       case "ctx":
-        this.ctx = c;
+        this.ctx = new Map(c);
     }
   }
 };
@@ -1287,10 +1301,10 @@ x.serialize = function(a = !0) {
   d = "index.ctx=new Map([" + d + "]);";
   return a ? "function inject(index){" + c + e + d + "}" : c + e + d;
 };
-ia(S.prototype);
-const Ca = {Index:S, Charset:xa, Encoder:L, Document:N, Worker:null, Resolver:null, IndexedDB:null, Language:{}}, Z = self;
-let Da;
-(Da = Z.define) && Da.amd ? Da([], function() {
-  return Ca;
-}) : "object" === typeof Z.exports ? Z.exports = Ca : Z.FlexSearch = Ca;
+ia(T.prototype);
+const Fa = {Index:T, Charset:za, Encoder:K, Document:O, Worker:null, Resolver:null, IndexedDB:null, Language:{}}, Z = self;
+let Ga;
+(Ga = Z.define) && Ga.amd ? Ga([], function() {
+  return Fa;
+}) : "object" === typeof Z.exports ? Z.exports = Fa : Z.FlexSearch = Fa;
 }(this||self));
diff --git a/dist/flexsearch.compact.min.js b/dist/flexsearch.compact.min.js
index 736b2b5..5f9ec2d 100644
--- a/dist/flexsearch.compact.min.js
+++ b/dist/flexsearch.compact.min.js
@@ -5,48 +5,47 @@
  * Hosted by Nextapps GmbH
  * https://github.com/nextapps-de/flexsearch
  */
-(function _f(self){'use strict';if(typeof module!=='undefined')self=module;else if(typeof process !== 'undefined')self=process;self._factory=_f;var x;function B(a,c,b){const e=typeof b,d=typeof a;if("undefined"!==e){if("undefined"!==d){if(b){if("function"===d&&e===d)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"===d?c:a}function C(){return Object.create(null)}function aa(a,c){return c.length-a.length}
-function E(a){return"string"===typeof a}function H(a){return"object"===typeof a}function I(a,c){if(E(c))a=a[c];else for(let b=0;a&&b<c.length;b++)a=a[c[b]];return a};var ba=[["\u00aa","a"],["\u00b2","2"],["\u00b3","3"],["\u00b9","1"],["\u00ba","o"],["\u00bc","1\u20444"],["\u00bd","1\u20442"],["\u00be","3\u20444"],["\u00e0","a"],["\u00e1","a"],["\u00e2","a"],["\u00e3","a"],["\u00e4","a"],["\u00e5","a"],["\u00e7","c"],["\u00e8","e"],["\u00e9","e"],["\u00ea","e"],["\u00eb","e"],["\u00ec","i"],["\u00ed","i"],["\u00ee","i"],["\u00ef","i"],["\u00f1","n"],["\u00f2","o"],["\u00f3","o"],["\u00f4","o"],["\u00f5","o"],["\u00f6","o"],["\u00f9","u"],["\u00fa","u"],["\u00fb",
+(function _f(self){'use strict';if(typeof module!=='undefined')self=module;else if(typeof process !== 'undefined')self=process;self._factory=_f;var x;function B(a,c,b){const e=typeof b,d=typeof a;if("undefined"!==e){if("undefined"!==d){if(b){if("function"===d&&e===d)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"===d?c:a}function D(){return Object.create(null)}function aa(a,c){return c.length-a.length}
+function E(a){return"string"===typeof a}function G(a){return"object"===typeof a}function I(a,c){if(E(c))a=a[c];else for(let b=0;a&&b<c.length;b++)a=a[c[b]];return a};var ba=[["\u00aa","a"],["\u00b2","2"],["\u00b3","3"],["\u00b9","1"],["\u00ba","o"],["\u00bc","1\u20444"],["\u00bd","1\u20442"],["\u00be","3\u20444"],["\u00e0","a"],["\u00e1","a"],["\u00e2","a"],["\u00e3","a"],["\u00e4","a"],["\u00e5","a"],["\u00e7","c"],["\u00e8","e"],["\u00e9","e"],["\u00ea","e"],["\u00eb","e"],["\u00ec","i"],["\u00ed","i"],["\u00ee","i"],["\u00ef","i"],["\u00f1","n"],["\u00f2","o"],["\u00f3","o"],["\u00f4","o"],["\u00f5","o"],["\u00f6","o"],["\u00f9","u"],["\u00fa","u"],["\u00fb",
 "u"],["\u00fc","u"],["\u00fd","y"],["\u00ff","y"],["\u0101","a"],["\u0103","a"],["\u0105","a"],["\u0107","c"],["\u0109","c"],["\u010b","c"],["\u010d","c"],["\u010f","d"],["\u0113","e"],["\u0115","e"],["\u0117","e"],["\u0119","e"],["\u011b","e"],["\u011d","g"],["\u011f","g"],["\u0121","g"],["\u0123","g"],["\u0125","h"],["\u0129","i"],["\u012b","i"],["\u012d","i"],["\u012f","i"],["\u0133","ij"],["\u0135","j"],["\u0137","k"],["\u013a","l"],["\u013c","l"],["\u013e","l"],["\u0140","l"],["\u0144","n"],
 ["\u0146","n"],["\u0148","n"],["\u0149","n"],["\u014d","o"],["\u014f","o"],["\u0151","o"],["\u0155","r"],["\u0157","r"],["\u0159","r"],["\u015b","s"],["\u015d","s"],["\u015f","s"],["\u0161","s"],["\u0163","t"],["\u0165","t"],["\u0169","u"],["\u016b","u"],["\u016d","u"],["\u016f","u"],["\u0171","u"],["\u0173","u"],["\u0175","w"],["\u0177","y"],["\u017a","z"],["\u017c","z"],["\u017e","z"],["\u017f","s"],["\u01a1","o"],["\u01b0","u"],["\u01c6","dz"],["\u01c9","lj"],["\u01cc","nj"],["\u01ce","a"],["\u01d0",
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diff --git a/dist/flexsearch.compact.module.debug.js b/dist/flexsearch.compact.module.debug.js
index d7507c9..c4b1452 100644
--- a/dist/flexsearch.compact.module.debug.js
+++ b/dist/flexsearch.compact.module.debug.js
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 function I(a, c) {
-  if (D(c)) {
+  if (E(c)) {
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     for (let b = 0; a && b < c.length; b++) {
@@ -74,15 +74,15 @@ function I(a, c) {
 "\u03b8"], ["\u03d2", "\u03a5"], ["\u03d3", "\u03a5"], ["\u03d4", "\u03a5"], ["\u03d5", "\u03c6"], ["\u03d6", "\u03c0"], ["\u03f0", "\u03ba"], ["\u03f1", "\u03c1"], ["\u03f2", "\u03c2"], ["\u03f5", "\u03b5"], ["\u0439", "\u0438"], ["\u0450", "\u0435"], ["\u0451", "\u0435"], ["\u0453", "\u0433"], ["\u0457", "\u0456"], ["\u045c", "\u043a"], ["\u045d", "\u0438"], ["\u045e", "\u0443"], ["\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 ca = /[^\p{L}\p{N}]+/u, da = /(\d{3})/g, ea = /(\D)(\d{3})/g, fa = /(\d{3})(\D)/g, J = "".normalize && /[\u0300-\u036f]/g;
-function L(a) {
-  if (!this) {
-    return new L(...arguments);
+function K(a) {
+  if (this.constructor !== K) {
+    return new K(...arguments);
   }
   for (let c = 0; c < arguments.length; c++) {
     this.assign(arguments[c]);
   }
 }
-L.prototype.assign = function(a) {
+K.prototype.assign = function(a) {
   this.normalize = B(a.normalize, !0, this.normalize);
   let c = a.include, b = c || a.exclude || a.split;
   if ("object" === typeof b) {
@@ -123,7 +123,7 @@ L.prototype.assign = function(a) {
   this.minlength = B(a.minlength, 1, this.minlength);
   this.maxlength = B(a.maxlength, 0, this.maxlength);
   if (this.cache = b = B(a.cache, !0, this.cache)) {
-    this.J = null, this.O = "number" === typeof b ? b : 2e5, this.F = new Map(), this.H = new Map(), this.D = this.h = 128;
+    this.I = null, this.O = "number" === typeof b ? b : 2e5, this.D = new Map(), this.G = new Map(), this.J = this.A = 128;
   }
   this.K = "";
   this.M = null;
@@ -141,14 +141,14 @@ L.prototype.assign = function(a) {
   }
   return this;
 };
-L.prototype.encode = function(a) {
-  if (this.cache && a.length <= this.h) {
-    if (this.J) {
-      if (this.F.has(a)) {
-        return this.F.get(a);
+K.prototype.encode = function(a) {
+  if (this.cache && a.length <= this.A) {
+    if (this.I) {
+      if (this.D.has(a)) {
+        return this.D.get(a);
       }
     } else {
-      this.J = setTimeout(ha, 50, this);
+      this.I = setTimeout(ha, 50, this);
     }
   }
   this.normalize && (a = "function" === typeof this.normalize ? this.normalize(a) : J ? a.normalize("NFKD").replace(J, "").toLowerCase() : a.toLowerCase());
@@ -170,15 +170,15 @@ L.prototype.encode = function(a) {
     if (this.filter && this.filter.has(g)) {
       continue;
     }
-    if (this.cache && g.length <= this.D) {
-      if (this.J) {
-        var d = this.H.get(g);
+    if (this.cache && g.length <= this.J) {
+      if (this.I) {
+        var d = this.G.get(g);
         if (d || "" === d) {
           d && b.push(d);
           continue;
         }
       } else {
-        this.J = setTimeout(ha, 50, this);
+        this.I = setTimeout(ha, 50, this);
       }
     }
     let k;
@@ -197,17 +197,17 @@ L.prototype.encode = function(a) {
         g = g.replace(this.replacer[d], this.replacer[d + 1]);
       }
     }
-    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));
+    this.cache && h.length <= this.J && (this.G.set(h, g), this.G.size > this.O && (this.G.clear(), this.J = this.J / 1.1 | 0));
     g && b.push(g);
   }
   this.finalize && (b = this.finalize(b) || b);
-  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));
+  this.cache && a.length <= this.A && (this.D.set(a, b), this.D.size > this.O && (this.D.clear(), this.A = this.A / 1.1 | 0));
   return b;
 };
 function ha(a) {
-  a.J = null;
-  a.F.clear();
-  a.H.clear();
+  a.I = null;
+  a.D.clear();
+  a.G.clear();
 }
 ;function ia(a) {
   M.call(a, "add");
@@ -227,12 +227,37 @@ function M(a) {
     return c;
   };
 }
-;function ja(a, c, b, e, d, f, g, h) {
-  (e = a(b ? b + "." + e : e, JSON.stringify(g))) && e.then ? e.then(function() {
-    c.export(a, c, b, d, f + 1, h);
-  }) : c.export(a, c, b, d, f + 1, h);
+;function N(a) {
+  const c = [];
+  for (const b of a.entries()) {
+    c.push(b);
+  }
+  return c;
 }
-;N.prototype.add = function(a, c, b) {
+function ja(a) {
+  const c = [];
+  for (const b of a.entries()) {
+    c.push(N(b));
+  }
+  return c;
+}
+function ka(a) {
+  const c = [];
+  for (const b of a.keys()) {
+    c.push(b);
+  }
+  return c;
+}
+function la(a, c, b, e, d, f) {
+  if ((b = a(c ? c + "." + b : b, JSON.stringify(f))) && b.then) {
+    const g = this;
+    return b.then(function() {
+      return g.export(a, c, e, d + 1);
+    });
+  }
+  return this.export(a, c, e, d + 1);
+}
+;O.prototype.add = function(a, c, b) {
   H(a) && (c = a, a = I(c, this.key));
   if (c && (a || 0 === a)) {
     if (!b && this.reg.has(a)) {
@@ -245,8 +270,8 @@ function M(a) {
         var d = k(c);
         d && e.add(a, d, !1, !0);
       } else {
-        if (d = k.G, !d || d(c)) {
-          k.constructor === String ? k = ["" + k] : D(k) && (k = [k]), O(c, k, this.I, 0, e, a, k[0], b);
+        if (d = k.F, !d || d(c)) {
+          k.constructor === String ? k = ["" + k] : E(k) && (k = [k]), P(c, k, this.H, 0, e, a, k[0], b);
         }
       }
     }
@@ -260,7 +285,7 @@ function M(a) {
             continue;
           }
         } else {
-          const k = f.G;
+          const k = f.F;
           if (k && !k(c)) {
             continue;
           }
@@ -268,7 +293,7 @@ function M(a) {
           f = I(c, f);
         }
         if (d && f) {
-          D(f) && (f = [f]);
+          E(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.reg.get(a)) ? g.push(m) : this.reg.set(a, [m]))));
           }
@@ -279,11 +304,11 @@ function M(a) {
     }
     if (this.store && (!b || !this.store.has(a))) {
       let h;
-      if (this.A) {
+      if (this.h) {
         h = C();
-        for (let k = 0, l; k < this.A.length; k++) {
-          l = this.A[k];
-          if ((b = l.G) && !b(c)) {
+        for (let k = 0, l; k < this.h.length; k++) {
+          l = this.h[k];
+          if ((b = l.F) && !b(c)) {
             continue;
           }
           let m;
@@ -293,11 +318,11 @@ function M(a) {
               continue;
             }
             l = [l.S];
-          } else if (D(l) || l.constructor === String) {
+          } else if (E(l) || l.constructor === String) {
             h[l] = c[l];
             continue;
           }
-          P(c, h, l, 0, l[0], m);
+          Q(c, h, l, 0, l[0], m);
         }
       }
       this.store.set(a, h || c);
@@ -305,21 +330,21 @@ function M(a) {
   }
   return this;
 };
-function P(a, c, b, e, d, f) {
+function Q(a, c, b, e, d, f) {
   a = a[d];
   if (e === b.length - 1) {
     c[d] = f || a;
   } else if (a) {
     if (a.constructor === Array) {
       for (c = c[d] = Array(a.length), d = 0; d < a.length; d++) {
-        P(a, c, b, e, d);
+        Q(a, c, b, e, d);
       }
     } else {
-      c = c[d] || (c[d] = C()), d = b[++e], P(a, c, b, e, d);
+      c = c[d] || (c[d] = C()), d = b[++e], Q(a, c, b, e, d);
     }
   }
 }
-function O(a, c, b, e, d, f, g, h) {
+function P(a, c, b, e, d, f, g, h) {
   if (a = a[g]) {
     if (e === c.length - 1) {
       if (a.constructor === Array) {
@@ -335,15 +360,15 @@ function O(a, c, b, e, d, f, g, h) {
     } else {
       if (a.constructor === Array) {
         for (g = 0; g < a.length; g++) {
-          O(a, c, b, e, d, f, g, h);
+          P(a, c, b, e, d, f, g, h);
         }
       } else {
-        g = c[++e], O(a, c, b, e, d, f, g, h);
+        g = c[++e], P(a, c, b, e, d, f, g, h);
       }
     }
   }
 }
-;function ka(a, c) {
+;function ma(a, c) {
   const b = C(), e = [];
   for (let d = 0, f; d < c.length; d++) {
     f = c[d];
@@ -356,7 +381,7 @@ function O(a, c, b, e, d, f, g, h) {
   }
   return e;
 }
-;N.prototype.search = function(a, c, b, e) {
+;O.prototype.search = function(a, c, b, e) {
   b || (!c && H(a) ? (b = a, a = "") : H(c) && (b = c, c = 0));
   let d = [];
   var f = [];
@@ -379,7 +404,7 @@ function O(a, c, b, e, d, f, g, h) {
       var u = [];
       for (let w = 0, q; w < m.length; w++) {
         q = m[w];
-        if (D(q)) {
+        if (E(q)) {
           throw Error("A tag option can't be a string, instead it needs a { field: tag } format.");
         }
         if (q.field && q.tag) {
@@ -393,8 +418,8 @@ function O(a, c, b, e, d, f, g, h) {
           }
         } else {
           v = Object.keys(q);
-          for (let E = 0, A, z; E < v.length; E++) {
-            if (A = v[E], z = q[A], z.constructor === Array) {
+          for (let D = 0, A, z; D < v.length; D++) {
+            if (A = v[D], z = q[A], z.constructor === Array) {
               for (y = 0; y < z.length; y++) {
                 u.push(A, z[y]);
               }
@@ -412,7 +437,7 @@ function O(a, c, b, e, d, f, g, h) {
         e = [];
         if (u.length) {
           for (f = 0; f < u.length; f += 2) {
-            r = la.call(this, u[f], u[f + 1], c, n, g), d.push({field:u[f], tag:u[f + 1], result:r});
+            r = na.call(this, u[f], u[f + 1], c, n, g), d.push({field:u[f], tag:u[f + 1], result:r});
           }
         }
         return e.length ? Promise.all(e).then(function(w) {
@@ -423,18 +448,18 @@ function O(a, c, b, e, d, f, g, h) {
         }) : d;
       }
     }
-    D(l) && (l = [l]);
+    E(l) && (l = [l]);
   }
   l || (l = this.field);
   u = !e && (this.worker || this.db) && [];
-  for (let w = 0, q, E, A; w < l.length; w++) {
-    E = l[w];
+  for (let w = 0, q, D, A; w < l.length; w++) {
+    D = l[w];
     let z;
-    D(E) || (z = E, E = z.field, a = z.query || a, c = z.limit || c, n = z.offset || n, k = z.suggest || k, g = this.store && (z.enrich || g));
+    E(D) || (z = D, D = z.field, a = z.query || a, c = z.limit || c, n = z.offset || n, k = z.suggest || k, g = this.store && (z.enrich || g));
     if (e) {
       q = e[w];
     } else {
-      if (v = z || b, y = this.index.get(E), m && (v.enrich = !1), u) {
+      if (v = z || b, y = this.index.get(D), m && (v.enrich = !1), u) {
         u[w] = y.search(a, c, v);
         v && g && (v.enrich = g);
         continue;
@@ -446,7 +471,7 @@ function O(a, c, b, e, d, f, g, h) {
     if (m && A) {
       v = [];
       y = 0;
-      for (let G = 0, F, K; G < m.length; G += 2) {
+      for (let G = 0, F, L; G < m.length; G += 2) {
         F = this.tag.get(m[G]);
         if (!F) {
           if (console.warn("Tag '" + m[G] + ":" + m[G + 1] + "' will be skipped because there is no field '" + m[G] + "'."), k) {
@@ -455,14 +480,14 @@ function O(a, c, b, e, d, f, g, h) {
             return d;
           }
         }
-        if (K = (F = F && F.get(m[G + 1])) && F.length) {
+        if (L = (F = F && F.get(m[G + 1])) && F.length) {
           y++, v.push(F);
         } else if (!k) {
           return d;
         }
       }
       if (y) {
-        q = ka(q, v);
+        q = ma(q, v);
         A = q.length;
         if (!A && !k) {
           return d;
@@ -471,7 +496,7 @@ function O(a, c, b, e, d, f, g, h) {
       }
     }
     if (A) {
-      f[t] = E, d.push(q), t++;
+      f[t] = D, d.push(q), t++;
     } else if (1 === l.length) {
       return d;
     }
@@ -491,15 +516,15 @@ function O(a, c, b, e, d, f, g, h) {
   u = [];
   for (let w = 0, q; w < f.length; w++) {
     q = d[w];
-    g && q.length && !q[0].doc && q.length && (q = ma.call(this, q));
+    g && q.length && !q[0].doc && q.length && (q = oa.call(this, q));
     if (r) {
       return q;
     }
     d[w] = {field:f[w], result:q};
   }
-  return h ? na(d, c) : p ? oa(d, a, this.index, this.field, this.C, p) : d;
+  return h ? pa(d, c) : p ? qa(d, a, this.index, this.field, this.C, p) : d;
 };
-function oa(a, c, b, e, d, f) {
+function qa(a, c, b, e, d, f) {
   let g, h, k;
   for (let m = 0, n, t, p, r, u; m < a.length; m++) {
     n = a[m].result;
@@ -514,21 +539,21 @@ function oa(a, c, b, e, d, f) {
       var l = I(n[v].doc, u);
       let w = g.encode(l);
       l = l.split(g.split);
-      for (let q = 0, E, A; q < w.length; q++) {
-        E = w[q];
+      for (let q = 0, D, A; q < w.length; q++) {
+        D = w[q];
         A = l[q];
         let z;
         for (let G = 0, F; G < h.length; G++) {
           if (F = h[G], "strict" === k) {
-            if (E === F) {
+            if (D === F) {
               y += (y ? " " : "") + f.replace("$1", A);
               z = !0;
               break;
             }
           } else {
-            const K = E.indexOf(F);
-            if (-1 < K) {
-              y += (y ? " " : "") + A.substring(0, K) + f.replace("$1", A.substring(K, F.length)) + A.substring(K + F.length);
+            const L = D.indexOf(F);
+            if (-1 < L) {
+              y += (y ? " " : "") + A.substring(0, L) + f.replace("$1", A.substring(L, F.length)) + A.substring(L + F.length);
               z = !0;
               break;
             }
@@ -541,7 +566,7 @@ function oa(a, c, b, e, d, f) {
   }
   return a;
 }
-function na(a, c) {
+function pa(a, c) {
   const b = [], e = C();
   for (let d = 0, f, g; d < a.length; d++) {
     f = a[d];
@@ -560,7 +585,7 @@ function na(a, c) {
   }
   return b;
 }
-function la(a, c, b, e, d) {
+function na(a, c, b, e, d) {
   let f = this.tag.get(a);
   if (!f) {
     return console.warn("Tag '" + a + "' was not found"), [];
@@ -569,43 +594,43 @@ function la(a, c, b, e, d) {
     if (a > b || e) {
       f = f.slice(e, e + b);
     }
-    d && (f = ma.call(this, f));
+    d && (f = oa.call(this, f));
     return f;
   }
 }
-function ma(a) {
+function oa(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 N(a) {
-  if (!this) {
-    return new N(a);
+;function O(a) {
+  if (this.constructor !== O) {
+    return new O(a);
   }
   const c = a.document || a.doc || a;
   var b;
   this.C = [];
   this.field = [];
-  this.I = [];
-  this.key = (b = c.key || c.id) && Q(b, this.I) || "id";
+  this.H = [];
+  this.key = (b = c.key || c.id) && R(b, this.H) || "id";
   this.reg = (this.fastupdate = !!a.fastupdate) ? new Map() : new Set();
-  this.A = (b = c.store || null) && !0 !== b && [];
+  this.h = (b = c.store || null) && !0 !== b && [];
   this.store = b && new Map();
-  this.cache = (b = a.cache || null) && new R(b);
+  this.cache = (b = a.cache || null) && new S(b);
   a.cache = !1;
   b = new Map();
   let e = c.index || c.field || c;
-  D(e) && (e = [e]);
+  E(e) && (e = [e]);
   for (let d = 0, f, g; d < e.length; d++) {
-    f = e[d], D(f) || (g = f, f = f.field), g = H(g) ? Object.assign({}, a, g) : a, b.set(f, new S(g, this.reg)), g.custom ? this.C[d] = g.custom : (this.C[d] = Q(f, this.I), g.filter && ("string" === typeof this.C[d] && (this.C[d] = new String(this.C[d])), this.C[d].G = g.filter)), this.field[d] = f;
+    f = e[d], E(f) || (g = f, f = f.field), g = H(g) ? Object.assign({}, a, g) : a, b.set(f, new T(g, this.reg)), g.custom ? this.C[d] = g.custom : (this.C[d] = R(f, this.H), g.filter && ("string" === typeof this.C[d] && (this.C[d] = new String(this.C[d])), this.C[d].F = g.filter)), this.field[d] = f;
   }
-  if (this.A) {
+  if (this.h) {
     a = c.store;
-    D(a) && (a = [a]);
+    E(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] = Q(g, this.I), f.filter && ("string" === typeof this.A[d] && (this.A[d] = new String(this.A[d])), this.A[d].G = f.filter));
+      f = a[d], g = f.field || f, f.custom ? (this.h[d] = f.custom, f.custom.S = g) : (this.h[d] = R(g, this.H), f.filter && ("string" === typeof this.h[d] && (this.h[d] = new String(this.h[d])), this.h[d].F = f.filter));
     }
   }
   this.index = b;
@@ -621,14 +646,14 @@ function ma(a) {
         if (!g) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
-        f.custom ? this.B[d] = f.custom : (this.B[d] = Q(g, this.I), f.filter && ("string" === typeof this.B[d] && (this.B[d] = new String(this.B[d])), this.B[d].G = f.filter));
+        f.custom ? this.B[d] = f.custom : (this.B[d] = R(g, this.H), f.filter && ("string" === typeof this.B[d] && (this.B[d] = new String(this.B[d])), this.B[d].F = f.filter));
         this.R[d] = g;
         this.tag.set(g, new Map());
       }
     }
   }
 }
-function Q(a, c) {
+function R(a, c) {
   const b = a.split(":");
   let e = 0;
   for (let d = 0; d < b.length; d++) {
@@ -637,7 +662,7 @@ function Q(a, c) {
   e < b.length && (b.length = e);
   return 1 < e ? b : b[0];
 }
-x = N.prototype;
+x = O.prototype;
 x.append = function(a, c) {
   return this.add(a, c, !0);
 };
@@ -693,65 +718,70 @@ x.set = function(a, c) {
   this.store.set(a, c);
   return this;
 };
-x.searchCache = pa;
-x.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;
+x.searchCache = ra;
+x.export = function(a, c, b = 0, e = 0) {
+  if (b < this.field.length) {
+    const g = this.field[b];
+    if ((c = this.index.get(g).export(a, g, b, e = 1)) && c.then) {
+      const h = this;
+      return c.then(function() {
+        return h.export(a, g, b + 1, e = 0);
+      });
     }
-    ja(a, this, b, c, e, d, h, f);
+    return this.export(a, g, b + 1, e = 0);
   }
-  return g;
+  let d, f;
+  switch(e) {
+    case 0:
+      d = "reg";
+      f = ka(this.reg);
+      c = null;
+      break;
+    case 1:
+      d = "tag";
+      f = ja(this.tag);
+      c = null;
+      break;
+    case 2:
+      d = "doc";
+      f = N(this.store);
+      c = null;
+      break;
+    case 3:
+      d = "cfg";
+      f = {};
+      c = null;
+      break;
+    default:
+      return;
+  }
+  return la.call(this, a, c, d, b, e, f);
 };
 x.import = function(a, c) {
   if (c) {
-    switch(D(c) && (c = JSON.parse(c)), a) {
+    switch(E(c) && (c = JSON.parse(c)), a) {
       case "tag":
-        this.D = c;
         break;
       case "reg":
         this.fastupdate = !1;
-        this.reg = c;
+        this.reg = new Set(c);
         for (let e = 0, d; e < this.field.length; e++) {
-          d = this.index[this.field[e]], d.reg = c, d.fastupdate = !1;
+          d = this.index.get(this.field[e]), d.fastupdate = !1, d.reg = this.reg;
         }
         break;
-      case "store":
-        this.store = c;
+      case "doc":
+        this.store = new Map(c);
         break;
       default:
         a = a.split(".");
         const b = a[0];
         a = a[1];
-        b && a && this.index[b].import(a, c);
+        b && a && this.index.get(b).import(a, c);
     }
   }
 };
-ia(N.prototype);
-function pa(a, c, b) {
+ia(O.prototype);
+function ra(a, c, b) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
   let e = this.cache.get(a);
   if (!e) {
@@ -767,57 +797,57 @@ function pa(a, c, b) {
   }
   return e;
 }
-function R(a) {
+function S(a) {
   this.limit = a && !0 !== a ? a : 1000;
   this.cache = new Map();
-  this.h = "";
+  this.A = "";
 }
-R.prototype.set = function(a, c) {
-  this.cache.set(this.h = a, c);
+S.prototype.set = function(a, c) {
+  this.cache.set(this.A = a, c);
   this.cache.size > this.limit && this.cache.delete(this.cache.keys().next().value);
 };
-R.prototype.get = function(a) {
+S.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.A !== a && (this.cache.delete(a), this.cache.set(this.A = a, c));
   return c;
 };
-R.prototype.remove = function(a) {
+S.prototype.remove = function(a) {
   for (const c of this.cache) {
     const b = c[0];
     c[1].includes(a) && this.cache.delete(b);
   }
 };
-R.prototype.clear = function() {
+S.prototype.clear = function() {
   this.cache.clear();
-  this.h = "";
+  this.A = "";
 };
-const qa = {normalize:function(a) {
+const sa = {normalize:function(a) {
   return a.toLowerCase();
 }, dedupe:!1};
-const T = 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 ra = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), sa = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
-const ta = {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 ua = /[\x00-\x7F]+/g;
-const va = /[\x00-\x7F]+/g;
+const U = 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 ta = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), ua = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
+const va = {a:"", e:"", i:"", o:"", u:"", y:"", b:1, f:1, p:1, v:1, c:2, g:2, j:2, k:2, q:2, s:2, x:2, z:2, "\u00df":2, d:3, t:3, l:4, m:5, n:5, r:6};
 const wa = /[\x00-\x7F]+/g;
-var xa = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:qa, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:T}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:T, matcher:ra, replacer:sa}, LatinExtra:{normalize:!0, dedupe:!0, mapper:T, replacer:sa.concat([/(?!^)[aeo]/g, ""]), matcher:ra}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
+const xa = /[\x00-\x7F]+/g;
+const ya = /[\x00-\x7F]+/g;
+var za = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:sa, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:U}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:U, matcher:ta, replacer:ua}, LatinExtra:{normalize:!0, dedupe:!0, mapper:U, replacer:ua.concat([/(?!^)[aeo]/g, ""]), matcher:ta}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
   for (let b = 0; b < a.length; b++) {
     var c = a[b];
-    let e = c.charAt(0), d = ta[e];
-    for (let f = 1, g; f < c.length && (g = c.charAt(f), "h" === g || "w" === g || !(g = ta[g]) || g === d || (e += g, d = g, 4 !== e.length)); f++) {
+    let e = c.charAt(0), d = va[e];
+    for (let f = 1, g; f < c.length && (g = c.charAt(f), "h" === g || "w" === g || !(g = va[g]) || g === d || (e += g, d = g, 4 !== e.length)); f++) {
     }
     a[b] = e;
   }
 }}, ArabicDefault:{rtl:!0, normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(ua, " ");
-}}, CjkDefault:{normalize:!1, dedupe:!0, split:"", prepare:function(a) {
-  return ("" + a).replace(va, "");
-}}, CyrillicDefault:{normalize:!1, dedupe:!0, prepare:function(a) {
   return ("" + a).replace(wa, " ");
+}}, CjkDefault:{normalize:!1, dedupe:!0, split:"", prepare:function(a) {
+  return ("" + a).replace(xa, "");
+}}, CyrillicDefault:{normalize:!1, dedupe:!0, prepare:function(a) {
+  return ("" + a).replace(ya, " ");
 }}};
-const ya = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
+const Aa = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
 C();
-S.prototype.add = function(a, c, b, e) {
+T.prototype.add = function(a, c, b, e) {
   if (c && (a || 0 === a)) {
     if (!e && !b && this.reg.has(a)) {
       return this.update(a, c);
@@ -829,15 +859,15 @@ S.prototype.add = function(a, c, b, e) {
         let r = c[this.rtl ? e - 1 - p : p];
         var d = r.length;
         if (d && (n || !m[r])) {
-          var f = this.score ? this.score(c, r, p, null, 0) : U(t, e, p), g = "";
+          var f = this.score ? this.score(c, r, p, null, 0) : V(t, e, p), g = "";
           switch(this.tokenize) {
             case "full":
               if (2 < d) {
                 for (f = 0; f < d; f++) {
                   for (var h = d; h > f; h--) {
                     g = r.substring(f, h);
-                    var k = this.score ? this.score(c, r, p, g, f) : U(t, e, p, d, f);
-                    V(this, m, g, k, a, b);
+                    var k = this.score ? this.score(c, r, p, g, f) : V(t, e, p, d, f);
+                    W(this, m, g, k, a, b);
                   }
                 }
                 break;
@@ -845,24 +875,24 @@ S.prototype.add = function(a, c, b, e) {
             case "reverse":
               if (1 < d) {
                 for (h = d - 1; 0 < h; h--) {
-                  g = r[h] + g, k = this.score ? this.score(c, r, p, g, h) : U(t, e, p, d, h), V(this, m, g, k, a, b);
+                  g = r[h] + g, k = this.score ? this.score(c, r, p, g, h) : V(t, e, p, d, h), W(this, m, g, k, a, b);
                 }
                 g = "";
               }
             case "forward":
               if (1 < d) {
                 for (h = 0; h < d; h++) {
-                  g += r[h], V(this, m, g, f, a, b);
+                  g += r[h], W(this, m, g, f, a, b);
                 }
                 break;
               }
             default:
-              if (V(this, m, r, f, a, b), n && 1 < e && p < e - 1) {
+              if (W(this, m, r, f, a, b), n && 1 < e && p < e - 1) {
                 for (d = C(), g = this.P, f = r, h = Math.min(n + 1, e - p), d[f] = 1, k = 1; k < h; k++) {
                   if ((r = c[this.rtl ? e - 1 - p - k : p + k]) && !d[r]) {
                     d[r] = 1;
-                    const u = this.score ? this.score(c, f, p, r, k) : U(g + (e / 2 > g ? 0 : 1), e, p, h - 1, k - 1), v = this.bidirectional && r > f;
-                    V(this, l, v ? f : r, u, a, b, v ? r : f);
+                    const u = this.score ? this.score(c, f, p, r, k) : V(g + (e / 2 > g ? 0 : 1), e, p, h - 1, k - 1), v = this.bidirectional && r > f;
+                    W(this, l, v ? f : r, u, a, b, v ? r : f);
                   }
                 }
               }
@@ -874,16 +904,16 @@ S.prototype.add = function(a, c, b, e) {
   }
   return this;
 };
-function V(a, c, b, e, d, f, g) {
+function W(a, c, b, e, d, f, g) {
   let h = g ? a.ctx : a.map, k;
   if (!c[b] || g && !(k = c[b])[g]) {
     g ? (c = k || (c[b] = C()), 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 U(a, c, b, e, d) {
+function V(a, c, b, e, d) {
   return b && 1 < a ? c + (e || 0) <= a ? b + (d || 0) : (a - 1) / (c + (e || 0)) * (b + (d || 0)) + 1 | 0 : 0;
 }
-;function za(a, c, b) {
+;function Ba(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;
   }
@@ -913,7 +943,7 @@ function U(a, c, b, e, d) {
   }
   return e.length ? e = 1 < e.length ? [].concat.apply([], e) : e[0] : e;
 }
-;S.prototype.search = function(a, c, b) {
+;T.prototype.search = function(a, c, b) {
   b || (!c && H(a) ? (b = a, a = "") : H(c) && (b = c, c = 0));
   var e = [], d = 0;
   if (b) {
@@ -927,11 +957,11 @@ function U(a, c, b, e, d) {
   b = a.length;
   c || (c = 100);
   if (1 === b) {
-    return W.call(this, a[0], "", c, d);
+    return X.call(this, a[0], "", c, d);
   }
   f = this.depth && !1 !== f;
   if (2 === b && f && !g) {
-    return W.call(this, a[0], a[1], c, d);
+    return X.call(this, a[0], a[1], c, d);
   }
   var h = 0, k = 0;
   if (1 < b) {
@@ -939,7 +969,7 @@ function U(a, c, b, e, d) {
     const n = [];
     for (let t = 0, p; t < b; t++) {
       if ((p = a[t]) && !l[p]) {
-        if (g || X(this, p)) {
+        if (g || Y(this, p)) {
           n.push(p), l[p] = 1;
         } else {
           return e;
@@ -957,10 +987,10 @@ function U(a, c, b, e, d) {
   }
   l = 0;
   if (1 === b) {
-    return W.call(this, a[0], "", c, d);
+    return X.call(this, a[0], "", c, d);
   }
   if (2 === b && f && !g) {
-    return W.call(this, a[0], a[1], c, d);
+    return X.call(this, a[0], a[1], c, d);
   }
   if (1 < b) {
     if (f) {
@@ -972,7 +1002,7 @@ function U(a, c, b, e, d) {
   }
   for (let n, t; l < b; l++) {
     t = a[l];
-    m ? (n = X(this, t, m), n = Aa(n, e, g, this.P), g && !1 === n && e.length || (m = t)) : (n = X(this, t, ""), n = Aa(n, e, g, this.resolution));
+    m ? (n = Y(this, t, m), n = Ca(n, e, g, this.P), g && !1 === n && e.length || (m = t)) : (n = Y(this, t, ""), n = Ca(n, e, g, this.resolution));
     if (n) {
       return n;
     }
@@ -987,7 +1017,7 @@ function U(a, c, b, e, d) {
         return e;
       }
       if (1 === f) {
-        return za(e[0], c, d);
+        return Ba(e[0], c, d);
       }
     }
   }
@@ -1046,10 +1076,10 @@ function U(a, c, b, e, d) {
   }
   return e;
 };
-function W(a, c, b, e) {
-  return (a = X(this, a, c)) && a.length ? za(a, b, e) : [];
+function X(a, c, b, e) {
+  return (a = Y(this, a, c)) && a.length ? Ba(a, b, e) : [];
 }
-function Aa(a, c, b, e) {
+function Ca(a, c, b, e) {
   let d = [];
   if (a) {
     e = Math.min(a.length, e);
@@ -1063,13 +1093,13 @@ function Aa(a, c, b, e) {
   }
   return !b && d;
 }
-function X(a, c, b) {
+function Y(a, c, b) {
   let e;
   b && (e = a.bidirectional && c > b);
   a = b ? (a = a.ctx.get(e ? c : b)) && a.get(e ? b : c) : a.map.get(c);
   return a;
 }
-;S.prototype.remove = function(a, c) {
+;T.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) {
@@ -1084,14 +1114,14 @@ function X(a, c, b) {
         }
       }
     } else {
-      Y(this.map, a), this.depth && Y(this.ctx, a);
+      Z(this.map, a), this.depth && Z(this.ctx, a);
     }
     c || this.reg.delete(a);
   }
   this.cache && this.cache.remove(a);
   return this;
 };
-function Y(a, c) {
+function Z(a, c) {
   let b = 0;
   if (a.constructor === Array) {
     for (let e = 0, d, f; e < a.length; e++) {
@@ -1106,25 +1136,25 @@ function Y(a, c) {
     }
   } else {
     for (let e of a) {
-      const d = e[0], f = Y(e[1], c);
+      const d = e[0], f = Z(e[1], c);
       f ? b += f : a.delete(d);
     }
   }
   return b;
 }
-;function S(a, c) {
-  if (!this) {
-    return new S(a);
+;function T(a, c) {
+  if (this.constructor !== T) {
+    return new T(a);
   }
   if (a) {
-    var b = D(a) ? a : a.preset;
-    b && (ya[b] || console.warn("Preset not found: " + b), a = Object.assign({}, ya[b], a));
+    var b = E(a) ? a : a.preset;
+    b && (Aa[b] || console.warn("Preset not found: " + b), a = Object.assign({}, Aa[b], a));
   } else {
     a = {};
   }
   b = a.context || {};
-  const e = D(a.encoder) ? xa[a.encoder] : a.encode || a.encoder || qa;
-  this.encoder = e.encode ? e : "object" === typeof e ? new L(e) : {encode:e};
+  const e = E(a.encoder) ? za[a.encoder] : a.encode || a.encoder || sa;
+  this.encoder = e.encode ? e : "object" === typeof e ? new K(e) : {encode:e};
   let d;
   this.resolution = a.resolution || 9;
   this.tokenize = d = a.tokenize || "strict";
@@ -1138,9 +1168,9 @@ function Y(a, c) {
   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 R(d);
+  this.cache = (d = a.cache || null) && new S(d);
 }
-x = S.prototype;
+x = T.prototype;
 x.clear = function() {
   this.map.clear();
   this.ctx.clear();
@@ -1158,7 +1188,7 @@ x.update = function(a, c) {
   const b = this, e = this.remove(a);
   return e && e.then ? e.then(() => b.add(a, c)) : this.add(a, c);
 };
-function Z(a) {
+function Da(a) {
   let c = 0;
   if (a.constructor === Array) {
     for (let b = 0, e; b < a.length; b++) {
@@ -1166,7 +1196,7 @@ function Z(a) {
     }
   } else {
     for (const b of a) {
-      const e = b[0], d = Z(b[1]);
+      const e = b[0], d = Da(b[1]);
       d ? c += d : a.delete(e);
     }
   }
@@ -1176,63 +1206,47 @@ x.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
-  Z(this.map);
-  this.depth && Z(this.ctx);
+  Da(this.map);
+  this.depth && Da(this.ctx);
   return this;
 };
-x.searchCache = pa;
-x.export = function(a, c, b, e, d, f) {
-  let g = !0;
-  "undefined" === typeof f && (g = new Promise(l => {
-    f = l;
-  }));
-  let h, k;
-  switch(d || (d = 0)) {
+x.searchCache = ra;
+x.export = function(a, c, b, e = 0) {
+  let d, f;
+  switch(e) {
     case 0:
-      h = "reg";
-      if (this.fastupdate) {
-        k = C();
-        for (let l of this.reg.keys()) {
-          k[l] = 1;
-        }
-      } else {
-        k = this.reg;
-      }
+      d = "reg";
+      f = ka(this.reg);
       break;
     case 1:
-      h = "cfg";
-      k = {doc:0, opt:this.h ? 1 : 0};
+      d = "cfg";
+      f = {};
       break;
     case 2:
-      h = "map";
-      k = this.map;
+      d = "map";
+      f = N(this.map);
       break;
     case 3:
-      h = "ctx";
-      k = this.ctx;
+      d = "ctx";
+      f = ja(this.ctx);
       break;
     default:
-      "undefined" === typeof b && f && f();
       return;
   }
-  ja(a, c || this, b, h, e, d, k, f);
-  return g;
+  return la.call(this, a, c, d, b, e, f);
 };
 x.import = function(a, c) {
   if (c) {
-    switch(D(c) && (c = JSON.parse(c)), a) {
-      case "cfg":
-        this.h = !!c.opt;
-        break;
+    switch(E(c) && (c = JSON.parse(c)), a) {
       case "reg":
         this.fastupdate = !1;
-        this.reg = c;
+        this.reg = new Set(c);
         break;
       case "map":
-        this.map = c;
+        this.map = new Map(c);
         break;
       case "ctx":
-        this.ctx = c;
+        this.ctx = new Map(c);
     }
   }
 };
@@ -1286,7 +1300,7 @@ x.serialize = function(a = !0) {
   d = "index.ctx=new Map([" + d + "]);";
   return a ? "function inject(index){" + c + e + d + "}" : c + e + d;
 };
-ia(S.prototype);
-export default {Index:S, Charset:xa, Encoder:L, Document:N, Worker:null, Resolver:null, IndexedDB:null, Language:{}};
+ia(T.prototype);
+export default {Index:T, Charset:za, Encoder:K, Document:O, Worker:null, Resolver:null, IndexedDB:null, Language:{}};
 
-export const Index=S;export const  Charset=xa;export const  Encoder=L;export const  Document=N;export const  Worker=null;export const  Resolver=null;export const  IndexedDB=null;export const  Language={};
\ No newline at end of file
+export const Index=T;export const  Charset=za;export const  Encoder=K;export const  Document=O;export const  Worker=null;export const  Resolver=null;export const  IndexedDB=null;export const  Language={};
\ No newline at end of file
diff --git a/dist/flexsearch.compact.module.min.js b/dist/flexsearch.compact.module.min.js
index b500242..04c5911 100644
--- a/dist/flexsearch.compact.module.min.js
+++ b/dist/flexsearch.compact.module.min.js
@@ -5,49 +5,48 @@
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  * https://github.com/nextapps-de/flexsearch
  */
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+function X(a,c,b,e){return(a=Y(this,a,c))&&a.length?Ba(a,b,e):[]}function Ca(a,c,b,e){let d=[];if(a){e=Math.min(a.length,e);for(let g=0,f;g<e;g++)(f=a[g])&&f&&(d[g]=f);if(d.length){c.push(d);return}}return!b&&d}function Y(a,c,b){let e;b&&(e=a.bidirectional&&c>b);a=b?(a=a.ctx.get(e?c:b))&&a.get(e?b:c):a.map.get(c);return a};T.prototype.remove=function(a,c){const b=this.reg.size&&(this.fastupdate?this.reg.get(a):this.reg.has(a));if(b){if(this.fastupdate)for(let e=0,d;e<b.length;e++){if(d=b[e])if(2>d.length)d.pop();else{const g=d.indexOf(a);g===b.length-1?d.pop():d.splice(g,1)}}else Z(this.map,a),this.depth&&Z(this.ctx,a);c||this.reg.delete(a)}this.cache&&this.cache.remove(a);return this};
+function Z(a,c){let b=0;if(a.constructor===Array)for(let e=0,d,g;e<a.length;e++){if((d=a[e])&&d.length)if(g=d.indexOf(c),0<=g){1<d.length?(d.splice(g,1),b++):delete a[e];break}else b++}else for(let e of a){const d=e[0],g=Z(e[1],c);g?b+=g:a.delete(d)}return b};function T(a,c){if(this.constructor!==T)return new T(a);if(a){var b=E(a)?a:a.preset;b&&(a=Object.assign({},Aa[b],a))}else a={};b=a.context||{};const e=E(a.encoder)?za[a.encoder]:a.encode||a.encoder||sa;this.encoder=e.encode?e:"object"===typeof e?new K(e):{encode:e};let d;this.resolution=a.resolution||9;this.tokenize=d=a.tokenize||"strict";this.depth="strict"===d&&b.depth||0;this.bidirectional=!1!==b.bidirectional;this.fastupdate=!!a.fastupdate;this.score=a.score||null;d=!1;this.map=new Map;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 S(d)}x=T.prototype;x.clear=function(){this.map.clear();this.ctx.clear();this.reg.clear();this.cache&&this.cache.clear();return this};x.append=function(a,c){return this.add(a,c,!0)};x.contain=function(a){return this.reg.has(a)};x.update=function(a,c){const b=this,e=this.remove(a);return e&&e.then?e.then(()=>b.add(a,c)):this.add(a,c)};
+function Da(a){let c=0;if(a.constructor===Array)for(let b=0,e;b<a.length;b++)(e=a[b])&&(c+=e.length);else for(const b of a){const e=b[0],d=Da(b[1]);d?c+=d:a.delete(e)}return c}x.cleanup=function(){if(!this.fastupdate)return this;Da(this.map);this.depth&&Da(this.ctx);return this};x.searchCache=ra;
+x.export=function(a,c,b,e=0){let d,g;switch(e){case 0:d="reg";g=ka(this.reg);break;case 1:d="cfg";g={};break;case 2:d="map";g=N(this.map);break;case 3:d="ctx";g=ja(this.ctx);break;default:return}return la.call(this,a,c,d,b,e,g)};x.import=function(a,c){if(c)switch(E(c)&&(c=JSON.parse(c)),a){case "reg":this.fastupdate=!1;this.reg=new Set(c);break;case "map":this.map=new Map(c);break;case "ctx":this.ctx=new Map(c)}};
 x.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 g=d[0],f=d[1],h="";for(let m=0,n;m<f.length;m++){n=f[m]||[""];var k="";for(var l=0;l<n.length;l++)k+=(k?",":"")+("string"===b?'"'+n[l]+'"':n[l]);k="["+k+"]";h+=(h?",":"")+k}h='["'+g+'",['+h+"]]";e+=(e?",":"")+h}e="index.map=new Map(["+e+"]);";d="";for(const m of this.ctx.entries()){g=
-m[0];f=m[1];for(const n of f.entries()){f=n[0];h=n[1];k="";for(let t=0,p;t<h.length;t++){p=h[t]||[""];l="";for(let r=0;r<p.length;r++)l+=(l?",":"")+("string"===b?'"'+p[r]+'"':p[r]);l="["+l+"]";k+=(k?",":"")+l}k='new Map([["'+f+'",['+k+"]]])";k='["'+g+'",'+k+"]";d+=(d?",":"")+k}}d="index.ctx=new Map(["+d+"]);";return a?"function inject(index){"+c+e+d+"}":c+e+d};ia(S.prototype);export default {Index:S,Charset:xa,Encoder:L,Document:N,Worker:null,Resolver:null,IndexedDB:null,Language:{}};
-export const Index=S;export const Charset=xa;export const Encoder=L;export const Document=N;export const Worker=null;export const Resolver=null;export const IndexedDB=null;export const Language={};
\ No newline at end of file
+m[0];f=m[1];for(const n of f.entries()){f=n[0];h=n[1];k="";for(let t=0,p;t<h.length;t++){p=h[t]||[""];l="";for(let r=0;r<p.length;r++)l+=(l?",":"")+("string"===b?'"'+p[r]+'"':p[r]);l="["+l+"]";k+=(k?",":"")+l}k='new Map([["'+f+'",['+k+"]]])";k='["'+g+'",'+k+"]";d+=(d?",":"")+k}}d="index.ctx=new Map(["+d+"]);";return a?"function inject(index){"+c+e+d+"}":c+e+d};ia(T.prototype);export default {Index:T,Charset:za,Encoder:K,Document:O,Worker:null,Resolver:null,IndexedDB:null,Language:{}};
+export const Index=T;export const Charset=za;export const Encoder=K;export const Document=O;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 b23dfde..0b471fe 100644
--- a/dist/flexsearch.es5.debug.js
+++ b/dist/flexsearch.es5.debug.js
@@ -126,7 +126,7 @@ function na(a, b) {
     }, b, a.h.return);
   }
   a.h.return(b);
-  return H(a);
+  return pa(a);
 }
 function oa(a, b, c, d) {
   try {
@@ -139,13 +139,13 @@ function oa(a, b, c, d) {
     }
     var g = e.value;
   } catch (f) {
-    return a.h.A = null, la(a.h, f), H(a);
+    return a.h.A = null, la(a.h, f), pa(a);
   }
   a.h.A = null;
   d.call(a.h, g);
-  return H(a);
+  return pa(a);
 }
-function H(a) {
+function pa(a) {
   for (; a.h.h;) {
     try {
       var b = a.A(a.h);
@@ -167,15 +167,15 @@ function H(a) {
   }
   return {value:void 0, done:!0};
 }
-function pa(a) {
+function qa(a) {
   this.next = function(b) {
     ka(a.h);
-    a.h.A ? b = oa(a, a.h.A.next, b, a.h.G) : (a.h.G(b), b = H(a));
+    a.h.A ? b = oa(a, a.h.A.next, b, a.h.G) : (a.h.G(b), b = pa(a));
     return b;
   };
   this.throw = function(b) {
     ka(a.h);
-    a.h.A ? b = oa(a, a.h.A["throw"], b, a.h.G) : (la(a.h, b), b = H(a));
+    a.h.A ? b = oa(a, a.h.A["throw"], b, a.h.G) : (la(a.h, b), b = pa(a));
     return b;
   };
   this.return = function(b) {
@@ -185,12 +185,12 @@ function pa(a) {
     return this;
   };
 }
-function qa(a, b) {
-  b = new pa(new ma(b));
+function ra(a, b) {
+  b = new qa(new ma(b));
   ia && a.prototype && ia(b, a.prototype);
   return b;
 }
-function ra(a) {
+function sa(a) {
   function b(d) {
     return a.next(d);
   }
@@ -204,8 +204,8 @@ function ra(a) {
     g(a.next());
   });
 }
-function I(a) {
-  return ra(new pa(new ma(a)));
+function ta(a) {
+  return sa(new qa(new ma(a)));
 }
 E("Symbol", function(a) {
   function b(g) {
@@ -235,12 +235,12 @@ E("Symbol.iterator", function(a) {
   for (var b = "Array Int8Array Uint8Array Uint8ClampedArray Int16Array Uint16Array Int32Array Uint32Array Float32Array Float64Array".split(" "), c = 0; c < b.length; c++) {
     var d = C[b[c]];
     "function" === typeof d && "function" != typeof d.prototype[a] && ba(d.prototype, a, {configurable:!0, writable:!0, value:function() {
-      return sa(aa(this));
+      return ua(aa(this));
     }});
   }
   return a;
 });
-function sa(a) {
+function ua(a) {
   a = {next:a};
   a[Symbol.iterator] = function() {
     return this;
@@ -474,7 +474,7 @@ E("Promise", function(a) {
   };
   return b;
 });
-function ta(a, b) {
+function va(a, b) {
   a instanceof String && (a += "");
   var c = 0, d = !1, e = {next:function() {
     if (!d && c < a.length) {
@@ -491,12 +491,12 @@ function ta(a, b) {
 }
 E("Array.prototype.values", function(a) {
   return a ? a : function() {
-    return ta(this, function(b, c) {
+    return va(this, function(b, c) {
       return c;
     });
   };
 });
-function J(a, b) {
+function H(a, b) {
   return Object.prototype.hasOwnProperty.call(a, b);
 }
 E("WeakMap", function(a) {
@@ -516,7 +516,7 @@ E("WeakMap", function(a) {
     return "object" === l && null !== k || "function" === l;
   }
   function e(k) {
-    if (!J(k, f)) {
+    if (!H(k, f)) {
       var l = new c();
       ba(k, f, {value:l});
     }
@@ -559,20 +559,20 @@ E("WeakMap", function(a) {
       throw Error("Invalid WeakMap key");
     }
     e(k);
-    if (!J(k, f)) {
+    if (!H(k, f)) {
       throw Error("WeakMap key fail: " + k);
     }
     k[f][this.h] = l;
     return this;
   };
   b.prototype.get = function(k) {
-    return d(k) && J(k, f) ? k[f][this.h] : void 0;
+    return d(k) && H(k, f) ? k[f][this.h] : void 0;
   };
   b.prototype.has = function(k) {
-    return d(k) && J(k, f) && J(k[f], this.h);
+    return d(k) && H(k, f) && H(k[f], this.h);
   };
   b.prototype.delete = function(k) {
-    return d(k) && J(k, f) && J(k[f], this.h) ? delete k[f][this.h] : !1;
+    return d(k) && H(k, f) && H(k[f], this.h) ? delete k[f][this.h] : !1;
   };
   return b;
 });
@@ -583,7 +583,7 @@ E("Map", function(a) {
   }
   function c(h, k) {
     var l = h[1];
-    return sa(function() {
+    return ua(function() {
       if (l) {
         for (; l.head != h[1];) {
           l = l.K;
@@ -600,7 +600,7 @@ E("Map", function(a) {
     var l = k && typeof k;
     "object" == l || "function" == l ? g.has(k) ? l = g.get(k) : (l = "" + ++f, g.set(k, l)) : l = "p_" + k;
     var m = h[0][l];
-    if (m && J(h[0], l)) {
+    if (m && H(h[0], l)) {
       for (h = 0; h < m.length; h++) {
         var n = m[h];
         if (k !== k && n.key !== n.key || k === n.key) {
@@ -691,7 +691,7 @@ E("Map", function(a) {
 });
 E("Array.prototype.keys", function(a) {
   return a ? a : function() {
-    return ta(this, function(b) {
+    return va(this, function(b) {
       return b;
     });
   };
@@ -764,7 +764,7 @@ E("Set", function(a) {
 });
 E("Array.prototype.entries", function(a) {
   return a ? a : function() {
-    return ta(this, function(b, c) {
+    return va(this, function(b, c) {
       return [b, c];
     });
   };
@@ -800,19 +800,19 @@ E("String.prototype.includes", function(a) {
     return -1 !== this.indexOf(b, c || 0);
   };
 });
-var ua = "function" == typeof Object.assign ? Object.assign : function(a, b) {
+var wa = "function" == typeof Object.assign ? Object.assign : function(a, b) {
   for (var c = 1; c < arguments.length; c++) {
     var d = arguments[c];
     if (d) {
       for (var e in d) {
-        J(d, e) && (a[e] = d[e]);
+        H(d, e) && (a[e] = d[e]);
       }
     }
   }
   return a;
 };
 E("Object.assign", function(a) {
-  return a || ua;
+  return a || wa;
 });
 E("Array.prototype.flat", function(a) {
   return a ? a : function(b) {
@@ -824,7 +824,7 @@ E("Array.prototype.flat", function(a) {
     return c;
   };
 });
-function L(a, b, c) {
+function I(a, b, c) {
   var d = typeof c, e = typeof a;
   if ("undefined" !== d) {
     if ("undefined" !== e) {
@@ -863,19 +863,19 @@ function L(a, b, c) {
   }
   return "undefined" === e ? b : a;
 }
-function M() {
+function J() {
   return Object.create(null);
 }
-function va(a, b) {
+function xa(a, b) {
   return b.length - a.length;
 }
-function N(a) {
+function K(a) {
   return "string" === typeof a;
 }
-function O(a) {
+function M(a) {
   return "object" === typeof a;
 }
-function wa(a) {
+function ya(a) {
   var b = [];
   a = y(a.keys());
   for (var c = a.next(); !c.done; c = a.next()) {
@@ -883,8 +883,8 @@ function wa(a) {
   }
   return b;
 }
-function xa(a, b) {
-  if (N(b)) {
+function za(a, b) {
+  if (K(b)) {
     a = a[b];
   } else {
     for (var c = 0; a && c < b.length; c++) {
@@ -893,13 +893,13 @@ function xa(a, b) {
   }
   return a;
 }
-function ya(a) {
+function Aa(a) {
   for (var b = 0, c = 0, d = void 0; c < a.length; c++) {
     (d = a[c]) && b < d.length && (b = d.length);
   }
   return b;
 }
-;var za = [["\u00aa", "a"], ["\u00b2", "2"], ["\u00b3", "3"], ["\u00b9", "1"], ["\u00ba", "o"], ["\u00bc", "1\u20444"], ["\u00bd", "1\u20442"], ["\u00be", "3\u20444"], ["\u00e0", "a"], ["\u00e1", "a"], ["\u00e2", "a"], ["\u00e3", "a"], ["\u00e4", "a"], ["\u00e5", "a"], ["\u00e7", "c"], ["\u00e8", "e"], ["\u00e9", "e"], ["\u00ea", "e"], ["\u00eb", "e"], ["\u00ec", "i"], ["\u00ed", "i"], ["\u00ee", "i"], ["\u00ef", "i"], ["\u00f1", "n"], ["\u00f2", "o"], ["\u00f3", "o"], ["\u00f4", "o"], ["\u00f5", 
+;var Ba = [["\u00aa", "a"], ["\u00b2", "2"], ["\u00b3", "3"], ["\u00b9", "1"], ["\u00ba", "o"], ["\u00bc", "1\u20444"], ["\u00bd", "1\u20442"], ["\u00be", "3\u20444"], ["\u00e0", "a"], ["\u00e1", "a"], ["\u00e2", "a"], ["\u00e3", "a"], ["\u00e4", "a"], ["\u00e5", "a"], ["\u00e7", "c"], ["\u00e8", "e"], ["\u00e9", "e"], ["\u00ea", "e"], ["\u00eb", "e"], ["\u00ec", "i"], ["\u00ed", "i"], ["\u00ee", "i"], ["\u00ef", "i"], ["\u00f1", "n"], ["\u00f2", "o"], ["\u00f3", "o"], ["\u00f4", "o"], ["\u00f5", 
 "o"], ["\u00f6", "o"], ["\u00f9", "u"], ["\u00fa", "u"], ["\u00fb", "u"], ["\u00fc", "u"], ["\u00fd", "y"], ["\u00ff", "y"], ["\u0101", "a"], ["\u0103", "a"], ["\u0105", "a"], ["\u0107", "c"], ["\u0109", "c"], ["\u010b", "c"], ["\u010d", "c"], ["\u010f", "d"], ["\u0113", "e"], ["\u0115", "e"], ["\u0117", "e"], ["\u0119", "e"], ["\u011b", "e"], ["\u011d", "g"], ["\u011f", "g"], ["\u0121", "g"], ["\u0123", "g"], ["\u0125", "h"], ["\u0129", "i"], ["\u012b", "i"], ["\u012d", "i"], ["\u012f", "i"], ["\u0133", 
 "ij"], ["\u0135", "j"], ["\u0137", "k"], ["\u013a", "l"], ["\u013c", "l"], ["\u013e", "l"], ["\u0140", "l"], ["\u0144", "n"], ["\u0146", "n"], ["\u0148", "n"], ["\u0149", "n"], ["\u014d", "o"], ["\u014f", "o"], ["\u0151", "o"], ["\u0155", "r"], ["\u0157", "r"], ["\u0159", "r"], ["\u015b", "s"], ["\u015d", "s"], ["\u015f", "s"], ["\u0161", "s"], ["\u0163", "t"], ["\u0165", "t"], ["\u0169", "u"], ["\u016b", "u"], ["\u016d", "u"], ["\u016f", "u"], ["\u0171", "u"], ["\u0173", "u"], ["\u0175", "w"], ["\u0177", 
 "y"], ["\u017a", "z"], ["\u017c", "z"], ["\u017e", "z"], ["\u017f", "s"], ["\u01a1", "o"], ["\u01b0", "u"], ["\u01c6", "dz"], ["\u01c9", "lj"], ["\u01cc", "nj"], ["\u01ce", "a"], ["\u01d0", "i"], ["\u01d2", "o"], ["\u01d4", "u"], ["\u01d6", "u"], ["\u01d8", "u"], ["\u01da", "u"], ["\u01dc", "u"], ["\u01df", "a"], ["\u01e1", "a"], ["\u01e3", "ae"], ["\u00e6", "ae"], ["\u01fd", "ae"], ["\u01e7", "g"], ["\u01e9", "k"], ["\u01eb", "o"], ["\u01ed", "o"], ["\u01ef", "\u0292"], ["\u01f0", "j"], ["\u01f3", 
@@ -907,9 +907,9 @@ function ya(a) {
 ["\u02b2", "j"], ["\u02b3", "r"], ["\u02b4", "\u0279"], ["\u02b5", "\u027b"], ["\u02b6", "\u0281"], ["\u02b7", "w"], ["\u02b8", "y"], ["\u02e0", "\u0263"], ["\u02e1", "l"], ["\u02e2", "s"], ["\u02e3", "x"], ["\u02e4", "\u0295"], ["\u0390", "\u03b9"], ["\u03ac", "\u03b1"], ["\u03ad", "\u03b5"], ["\u03ae", "\u03b7"], ["\u03af", "\u03b9"], ["\u03b0", "\u03c5"], ["\u03ca", "\u03b9"], ["\u03cb", "\u03c5"], ["\u03cc", "\u03bf"], ["\u03cd", "\u03c5"], ["\u03ce", "\u03c9"], ["\u03d0", "\u03b2"], ["\u03d1", 
 "\u03b8"], ["\u03d2", "\u03a5"], ["\u03d3", "\u03a5"], ["\u03d4", "\u03a5"], ["\u03d5", "\u03c6"], ["\u03d6", "\u03c0"], ["\u03f0", "\u03ba"], ["\u03f1", "\u03c1"], ["\u03f2", "\u03c2"], ["\u03f5", "\u03b5"], ["\u0439", "\u0438"], ["\u0450", "\u0435"], ["\u0451", "\u0435"], ["\u0453", "\u0433"], ["\u0457", "\u0456"], ["\u045c", "\u043a"], ["\u045d", "\u0438"], ["\u045e", "\u0443"], ["\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"]];
-var Aa = /[^\p{L}\p{N}]+/u, Ba = /(\d{3})/g, Ca = /(\D)(\d{3})/g, Ea = /(\d{3})(\D)/g, Fa = "".normalize && /[\u0300-\u036f]/g;
-function Ga(a) {
-  if (!this) {
+var Ca = /[^\p{L}\p{N}]+/u, Da = /(\d{3})/g, Fa = /(\D)(\d{3})/g, Ga = /(\d{3})(\D)/g, Ha = "".normalize && /[\u0300-\u036f]/g;
+function N(a) {
+  if (this.constructor !== N) {
     var b = Function.prototype.bind, c = b.apply, d = [null], e = d.concat;
     if (arguments instanceof Array) {
       var g = arguments;
@@ -920,14 +920,14 @@ function Ga(a) {
       }
       g = h;
     }
-    return new (c.call(b, Ga, e.call(d, g)))();
+    return new (c.call(b, N, e.call(d, g)))();
   }
   for (b = 0; b < arguments.length; b++) {
     this.assign(arguments[b]);
   }
 }
-Ga.prototype.assign = function(a) {
-  this.normalize = L(a.normalize, !0, this.normalize);
+N.prototype.assign = function(a) {
+  this.normalize = I(a.normalize, !0, this.normalize);
   var b = a.include, c = b || a.exclude || a.split;
   if ("object" === typeof c) {
     var d = !b, e = "";
@@ -948,25 +948,25 @@ Ga.prototype.assign = function(a) {
     this.numeric = d;
   } else {
     try {
-      this.split = L(c, Aa, this.split);
+      this.split = I(c, Ca, this.split);
     } catch (g) {
       this.split = /\s+/;
     }
-    this.numeric = L(this.numeric, !0);
+    this.numeric = I(this.numeric, !0);
   }
-  this.prepare = L(a.prepare, null, this.prepare);
-  this.finalize = L(a.finalize, null, this.finalize);
-  Fa || (this.mapper = new Map(za));
+  this.prepare = I(a.prepare, null, this.prepare);
+  this.finalize = I(a.finalize, null, this.finalize);
+  Ha || (this.mapper = new Map(Ba));
   this.rtl = a.rtl || !1;
-  this.dedupe = L(a.dedupe, !0, this.dedupe);
-  this.filter = L((c = a.filter) && new Set(c), null, this.filter);
-  this.matcher = L((c = a.matcher) && new Map(c), null, this.matcher);
-  this.mapper = L((c = a.mapper) && new Map(c), null, this.mapper);
-  this.stemmer = L((c = a.stemmer) && new Map(c), null, this.stemmer);
-  this.replacer = L(a.replacer, null, this.replacer);
-  this.minlength = L(a.minlength, 1, this.minlength);
-  this.maxlength = L(a.maxlength, 0, this.maxlength);
-  if (this.cache = c = L(a.cache, !0, this.cache)) {
+  this.dedupe = I(a.dedupe, !0, this.dedupe);
+  this.filter = I((c = a.filter) && new Set(c), null, this.filter);
+  this.matcher = I((c = a.matcher) && new Map(c), null, this.matcher);
+  this.mapper = I((c = a.mapper) && new Map(c), null, this.mapper);
+  this.stemmer = I((c = a.stemmer) && new Map(c), null, this.stemmer);
+  this.replacer = I(a.replacer, null, this.replacer);
+  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.U = null, this.L = "number" === typeof c ? c : 2e5, this.N = new Map(), this.S = new Map(), this.A = this.h = 128;
   }
   this.B = "";
@@ -985,7 +985,7 @@ Ga.prototype.assign = function(a) {
   }
   return this;
 };
-Ga.prototype.encode = function(a) {
+N.prototype.encode = function(a) {
   var b = this;
   if (this.cache && a.length <= this.h) {
     if (this.U) {
@@ -993,12 +993,12 @@ Ga.prototype.encode = function(a) {
         return this.N.get(a);
       }
     } else {
-      this.U = setTimeout(Ha, 50, this);
+      this.U = setTimeout(Ia, 50, this);
     }
   }
-  this.normalize && (a = "function" === typeof this.normalize ? this.normalize(a) : Fa ? a.normalize("NFKD").replace(Fa, "").toLowerCase() : a.toLowerCase());
+  this.normalize && (a = "function" === typeof this.normalize ? this.normalize(a) : Ha ? a.normalize("NFKD").replace(Ha, "").toLowerCase() : a.toLowerCase());
   this.prepare && (a = this.prepare(a));
-  this.numeric && 3 < a.length && (a = a.replace(Ca, "$1 $2").replace(Ea, "$1 $2").replace(Ba, "$1 "));
+  this.numeric && 3 < a.length && (a = a.replace(Fa, "$1 $2").replace(Ga, "$1 $2").replace(Da, "$1 "));
   for (var c = !(this.dedupe || this.mapper || this.filter || this.matcher || this.stemmer || this.replacer), d = [], e = this.split || "" === this.split ? a.split(this.split) : a, g = 0, f = void 0, h = void 0; g < e.length; g++) {
     if ((f = h = e[g]) && !(f.length < this.minlength)) {
       if (c) {
@@ -1013,7 +1013,7 @@ Ga.prototype.encode = function(a) {
                 continue;
               }
             } else {
-              this.U = setTimeout(Ha, 50, this);
+              this.U = setTimeout(Ia, 50, this);
             }
           }
           k = void 0;
@@ -1046,14 +1046,14 @@ Ga.prototype.encode = function(a) {
   this.cache && a.length <= this.h && (this.N.set(a, d), this.N.size > this.L && (this.N.clear(), this.h = this.h / 1.1 | 0));
   return d;
 };
-function Ha(a) {
+function Ia(a) {
   a.U = null;
   a.N.clear();
   a.S.clear();
 }
-;function Ia(a) {
+;function Ja(a) {
   var b, c, d, e, g, f, h, k;
-  return I(function(l) {
+  return ta(function(l) {
     a = a.data;
     b = self._index;
     c = a.args;
@@ -1062,7 +1062,7 @@ function Ha(a) {
       case "init":
         e = a.options || {};
         (g = e.config) && (e = g);
-        (f = a.factory) ? (Function("return " + f)()(self), self._index = new self.FlexSearch.Index(e), delete self.FlexSearch) : self._index = new R(e);
+        (f = a.factory) ? (Function("return " + f)()(self), self._index = new self.FlexSearch.Index(e), delete self.FlexSearch) : self._index = new O(e);
         postMessage({id:a.id});
         break;
       default:
@@ -1071,8 +1071,8 @@ function Ha(a) {
     l.h = 0;
   });
 }
-;var Ja = 0;
-function Ka(a) {
+;var Ka = 0;
+function R(a) {
   function b(f) {
     function h(k) {
       k = k.data || k;
@@ -1080,15 +1080,15 @@ function Ka(a) {
       m && (m(k.msg), delete e.h[l]);
     }
     this.worker = f;
-    this.h = M();
+    this.h = J();
     if (this.worker) {
       d ? this.worker.on("message", h) : this.worker.onmessage = h;
       if (a.config) {
         return new Promise(function(k) {
-          e.h[++Ja] = function() {
+          e.h[++Ka] = function() {
             k(e);
           };
-          e.worker.postMessage({id:Ja, task:"init", factory:c, options:a});
+          e.worker.postMessage({id:Ka, task:"init", factory:c, options:a});
         });
       }
       this.worker.postMessage({task:"init", factory:c, options:a});
@@ -1096,8 +1096,8 @@ function Ka(a) {
     }
   }
   a = void 0 === a ? {} : a;
-  if (!this) {
-    return new Ka(a);
+  if (this.constructor !== R) {
+    return new R(a);
   }
   var c = "undefined" !== typeof self ? self._factory : "undefined" !== typeof window ? window._factory : null;
   c && (c = c.toString());
@@ -1112,23 +1112,23 @@ Ma("search");
 Ma("update");
 Ma("remove");
 function Ma(a) {
-  Ka.prototype[a] = Ka.prototype[a + "Async"] = function() {
+  R.prototype[a] = R.prototype[a + "Async"] = function() {
     var b = this, c = arguments, d, e, g, f, h;
-    return I(function(k) {
+    return ta(function(k) {
       d = b;
       e = [].slice.call(c);
       g = e[e.length - 1];
       "function" === typeof g && (f = g, e.splice(e.length - 1, 1));
       h = new Promise(function(l) {
-        d.h[++Ja] = l;
-        d.worker.postMessage({task:a, id:Ja, args:e});
+        d.h[++Ka] = l;
+        d.worker.postMessage({task:a, id:Ka, args:e});
       });
       return f ? (h.then(f), k.return(b)) : k.return(h);
     });
   };
 }
 function La(a, b, c) {
-  return b ? "undefined" !== typeof module ? new (require("worker_threads")["Worker"])(__dirname + "/node/node.js") : import("worker_threads").then(function(worker){ return new worker["Worker"]((1,eval)("import.meta.dirname") + "/node/node.mjs"); }) : a ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + Ia.toString()], {type:"text/javascript"}))) : new window.Worker(N(c) ? c : (0,eval)("import.meta.url").replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", 
+  return b ? "undefined" !== typeof module ? new (require("worker_threads")["Worker"])(__dirname + "/node/node.js") : import("worker_threads").then(function(worker){ return new worker["Worker"]((1,eval)("import.meta.dirname") + "/node/node.mjs"); }) : a ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + Ja.toString()], {type:"text/javascript"}))) : new window.Worker(K(c) ? c : (0,eval)("import.meta.url").replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", 
   "module/worker/worker.js"), {type:"module"});
 }
 ;function Na(a) {
@@ -1150,12 +1150,40 @@ function Oa(a) {
     return b;
   };
 }
-;function Pa(a, b, c, d, e, g, f, h) {
-  (d = a(c ? c + "." + d : d, JSON.stringify(f))) && d.then ? d.then(function() {
-    b.export(a, b, c, e, g + 1, h);
-  }) : b.export(a, b, c, e, g + 1, h);
+;function Pa(a) {
+  var b = [];
+  a = y(a.entries());
+  for (var c = a.next(); !c.done; c = a.next()) {
+    b.push(c.value);
+  }
+  return b;
 }
-;function Qa(a, b, c, d) {
+function Qa(a) {
+  var b = [];
+  a = y(a.entries());
+  for (var c = a.next(); !c.done; c = a.next()) {
+    b.push(Pa(c.value));
+  }
+  return b;
+}
+function Ra(a) {
+  var b = [];
+  a = y(a.keys());
+  for (var c = a.next(); !c.done; c = a.next()) {
+    b.push(c.value);
+  }
+  return b;
+}
+function Sa(a, b, c, d, e, g) {
+  if ((c = a(b ? b + "." + c : c, JSON.stringify(g))) && c.then) {
+    var f = this;
+    return c.then(function() {
+      return f.export(a, b, d, e + 1);
+    });
+  }
+  return this.export(a, b, d, e + 1);
+}
+;function Ta(a, b, c, d) {
   for (var e = [], g = 0, f; g < a.index.length; g++) {
     if (f = a.index[g], b >= f.length) {
       b -= f.length;
@@ -1220,12 +1248,12 @@ function S(a) {
     }
     if ("slice" === d) {
       return function(e, g) {
-        return Qa(b, e || 0, g || b.length, !1);
+        return Ta(b, e || 0, g || b.length, !1);
       };
     }
     if ("splice" === d) {
       return function(e, g) {
-        return Qa(b, e || 0, g || b.length, !0);
+        return Ta(b, e || 0, g || b.length, !0);
       };
     }
     if ("constructor" === d) {
@@ -1254,10 +1282,10 @@ function T(a) {
   if (!this) {
     return new T(a);
   }
-  this.index = M();
+  this.index = J();
   this.B = [];
   this.size = 0;
-  32 < a ? (this.h = Ra, this.A = BigInt(a)) : (this.h = Sa, this.A = a);
+  32 < a ? (this.h = Ua, this.A = BigInt(a)) : (this.h = Va, this.A = a);
 }
 T.prototype.get = function(a) {
   var b = this.h(a);
@@ -1272,9 +1300,9 @@ function U(a) {
   if (!this) {
     return new U(a);
   }
-  this.index = M();
+  this.index = J();
   this.h = [];
-  32 < a ? (this.B = Ra, this.A = BigInt(a)) : (this.B = Sa, this.A = a);
+  32 < a ? (this.B = Ua, this.A = BigInt(a)) : (this.B = Va, this.A = a);
 }
 U.prototype.add = function(a) {
   var b = this.B(a), c = this.index[b];
@@ -1290,13 +1318,13 @@ v.delete = U.prototype.delete = function(a) {
   (b = this.index[b]) && b.delete(a) && this.size--;
 };
 v.clear = U.prototype.clear = function() {
-  this.index = M();
+  this.index = J();
   this.h = [];
   this.size = 0;
 };
-v.values = U.prototype.values = function Ta() {
+v.values = U.prototype.values = function Wa() {
   var b, c = this, d, e, g;
-  return qa(Ta, function(f) {
+  return ra(Wa, function(f) {
     switch(f.h) {
       case 1:
         b = 0;
@@ -1320,9 +1348,9 @@ v.values = U.prototype.values = function Ta() {
     }
   });
 };
-v.keys = U.prototype.keys = function Ua() {
+v.keys = U.prototype.keys = function Xa() {
   var b, c = this, d, e, g;
-  return qa(Ua, function(f) {
+  return ra(Xa, function(f) {
     switch(f.h) {
       case 1:
         b = 0;
@@ -1346,9 +1374,9 @@ v.keys = U.prototype.keys = function Ua() {
     }
   });
 };
-v.entries = U.prototype.entries = function Va() {
+v.entries = U.prototype.entries = function Ya() {
   var b, c = this, d, e, g;
-  return qa(Va, function(f) {
+  return ra(Ya, function(f) {
     switch(f.h) {
       case 1:
         b = 0;
@@ -1372,7 +1400,7 @@ v.entries = U.prototype.entries = function Va() {
     }
   });
 };
-function Sa(a) {
+function Va(a) {
   var b = Math.pow(2, this.A) - 1;
   if ("number" == typeof a) {
     return a & b;
@@ -1382,11 +1410,11 @@ function Sa(a) {
   }
   return 32 === this.A ? c + Math.pow(2, 31) : c;
 }
-function Ra() {
+function Ua() {
   throw Error("The keystore is limited to 32 for EcmaScript5");
 }
 ;V.prototype.add = function(a, b, c) {
-  O(a) && (b = a, a = xa(b, this.key));
+  M(a) && (b = a, a = za(b, this.key));
   if (b && (a || 0 === a)) {
     if (!c && this.reg.has(a)) {
       return this.update(a, b);
@@ -1399,7 +1427,7 @@ function Ra() {
       } else {
         var f = e.R;
         if (!f || f(b)) {
-          e.constructor === String ? e = ["" + e] : N(e) && (e = [e]), Wa(b, e, this.T, 0, g, a, e[0], c);
+          e.constructor === String ? e = ["" + e] : K(e) && (e = [e]), Za(b, e, this.T, 0, g, a, e[0], c);
         }
       }
     }
@@ -1408,7 +1436,7 @@ function Ra() {
         f = this.M[d];
         var h = this.$[d];
         g = this.tag.get(h);
-        e = M();
+        e = J();
         if ("function" === typeof f) {
           if (f = f(b), !f) {
             continue;
@@ -1419,10 +1447,10 @@ function Ra() {
             continue;
           }
           f.constructor === String && (f = "" + f);
-          f = xa(b, f);
+          f = za(b, f);
         }
         if (g && f) {
-          for (N(f) && (f = [f]), h = 0, k = void 0; h < f.length; h++) {
+          for (K(f) && (f = [f]), h = 0, k = void 0; h < f.length; h++) {
             var l = f[h];
             if (!e[l]) {
               e[l] = 1;
@@ -1450,7 +1478,7 @@ function Ra() {
     }
     if (this.store && (!c || !this.store.has(a))) {
       if (this.H) {
-        var q = M();
+        var q = J();
         for (c = 0; c < this.H.length; c++) {
           if (d = this.H[c], g = d.R, !g || g(b)) {
             g = void 0;
@@ -1460,11 +1488,11 @@ function Ra() {
                 continue;
               }
               d = [d.la];
-            } else if (N(d) || d.constructor === String) {
+            } else if (K(d) || d.constructor === String) {
               q[d] = b[d];
               continue;
             }
-            Xa(b, q, d, 0, d[0], g);
+            $a(b, q, d, 0, d[0], g);
           }
         }
       }
@@ -1473,21 +1501,21 @@ function Ra() {
   }
   return this;
 };
-function Xa(a, b, c, d, e, g) {
+function $a(a, b, c, d, e, g) {
   a = a[e];
   if (d === c.length - 1) {
     b[e] = g || a;
   } else if (a) {
     if (a.constructor === Array) {
       for (b = b[e] = Array(a.length), e = 0; e < a.length; e++) {
-        Xa(a, b, c, d, e);
+        $a(a, b, c, d, e);
       }
     } else {
-      b = b[e] || (b[e] = M()), e = c[++d], Xa(a, b, c, d, e);
+      b = b[e] || (b[e] = J()), e = c[++d], $a(a, b, c, d, e);
     }
   }
 }
-function Wa(a, b, c, d, e, g, f, h) {
+function Za(a, b, c, d, e, g, f, h) {
   if (a = a[f]) {
     if (d === b.length - 1) {
       if (a.constructor === Array) {
@@ -1503,19 +1531,19 @@ function Wa(a, b, c, d, e, g, f, h) {
     } else {
       if (a.constructor === Array) {
         for (f = 0; f < a.length; f++) {
-          Wa(a, b, c, d, e, g, f, h);
+          Za(a, b, c, d, e, g, f, h);
         }
       } else {
-        f = b[++d], Wa(a, b, c, d, e, g, f, h);
+        f = b[++d], Za(a, b, c, d, e, g, f, h);
       }
     }
   } else {
     e.db && e.remove(g);
   }
 }
-;function Ya(a, b, c, d, e, g, f) {
+;function ab(a, b, c, d, e, g, f) {
   var h = a.length, k = [], l;
-  var m = M();
+  var m = J();
   for (var n = 0, p = void 0, q; n < b; n++) {
     for (var r = 0; r < h; r++) {
       if (q = a[r], n < q.length && (p = q[n])) {
@@ -1534,7 +1562,7 @@ function Wa(a, b, c, d, e, g, f, h) {
   }
   if (a = k.length) {
     if (e) {
-      k = 1 < k.length ? Za(k, d, c, f, 0) : (k = k[0]).length > c || d ? k.slice(d, c + d) : k;
+      k = 1 < k.length ? bb(k, d, c, f, 0) : (k = k[0]).length > c || d ? k.slice(d, c + d) : k;
     } else {
       if (a < h) {
         return [];
@@ -1567,8 +1595,8 @@ function Wa(a, b, c, d, e, g, f, h) {
   }
   return k;
 }
-function Za(a, b, c, d, e) {
-  var g = [], f = M(), h = a.length, k = 0;
+function bb(a, b, c, d, e) {
+  var g = [], f = J(), h = a.length, k = 0;
   if (d) {
     for (e = h - 1; 0 <= e; e--) {
       d = a[e];
@@ -1587,7 +1615,7 @@ function Za(a, b, c, d, e) {
       }
     }
   } else {
-    for (var n = ya(a), p = 0; p < n; p++) {
+    for (var n = Aa(a), p = 0; p < n; p++) {
       for (var q = h - 1; 0 <= q; q--) {
         if (l = (d = a[q][p]) && d.length) {
           for (var r = 0; r < l; r++) {
@@ -1609,8 +1637,8 @@ function Za(a, b, c, d, e) {
   }
   return g;
 }
-function $a(a, b) {
-  for (var c = M(), d = [], e = 0, g; e < b.length; e++) {
+function cb(a, b) {
+  for (var c = J(), d = [], e = 0, g; e < b.length; e++) {
     g = b[e];
     for (var f = 0; f < g.length; f++) {
       c[g[f]] = 1;
@@ -1622,7 +1650,7 @@ function $a(a, b) {
   return d;
 }
 ;V.prototype.search = function(a, b, c, d) {
-  c || (!b && O(a) ? (c = a, a = "") : O(b) && (c = b, b = 0));
+  c || (!b && M(a) ? (c = a, a = "") : M(b) && (c = b, b = 0));
   var e = [], g = [], f = 0;
   if (c) {
     c.constructor === Array && (c = {index:c});
@@ -1641,7 +1669,7 @@ function $a(a, b) {
       m.constructor !== Array && (m = [m]);
       for (var u = [], w = 0, x = void 0; w < m.length; w++) {
         x = m[w];
-        if (N(x)) {
+        if (K(x)) {
           throw Error("A tag option can't be a string, instead it needs a { field: tag } format.");
         }
         if (x.field && x.tag) {
@@ -1684,7 +1712,7 @@ function $a(a, b) {
               }
               g.push(p = p.db.tag(u[h + 1], b, r, n));
             } else {
-              p = ab.call(this, u[h], u[h + 1], b, r, n);
+              p = db.call(this, u[h], u[h + 1], b, r, n);
             }
             e.push({field:u[h], tag:u[h + 1], result:p});
           }
@@ -1697,7 +1725,7 @@ function $a(a, b) {
         }) : e;
       }
     }
-    N(l) && (l = [l]);
+    K(l) && (l = [l]);
   }
   l || (l = this.field);
   u = !d && (this.worker || this.db) && [];
@@ -1705,7 +1733,7 @@ function $a(a, b) {
   for (z = x = t = void 0; w < l.length; w++) {
     if (x = l[w], !this.db || !this.tag || this.I[w]) {
       t = void 0;
-      N(x) || (t = x, x = t.field, a = t.query || a, b = t.limit || b, r = t.offset || r, p = t.suggest || p, n = this.store && (t.enrich || n));
+      K(x) || (t = x, x = t.field, a = t.query || a, b = t.limit || b, r = t.offset || r, p = t.suggest || p, n = this.store && (t.enrich || n));
       if (d) {
         t = d[w];
       } else {
@@ -1734,9 +1762,9 @@ function $a(a, b) {
         if (this.db && d) {
           if (!F) {
             for (D = l.length; D < d.length; D++) {
-              var K = d[D];
-              if (K && K.length) {
-                B++, A.push(K);
+              var L = d[D];
+              if (L && L.length) {
+                B++, A.push(L);
               } else if (!p) {
                 return e;
               }
@@ -1744,24 +1772,24 @@ function $a(a, b) {
           }
         } else {
           D = 0;
-          for (var Ib = K = void 0; D < m.length; D += 2) {
-            K = this.tag.get(m[D]);
-            if (!K) {
+          for (var Lb = L = void 0; D < m.length; D += 2) {
+            L = this.tag.get(m[D]);
+            if (!L) {
               if (console.warn("Tag '" + m[D] + ":" + m[D + 1] + "' will be skipped because there is no field '" + m[D] + "'."), p) {
                 continue;
               } else {
                 return e;
               }
             }
-            if (Ib = (K = K && K.get(m[D + 1])) && K.length) {
-              B++, A.push(K);
+            if (Lb = (L = L && L.get(m[D + 1])) && L.length) {
+              B++, A.push(L);
             } else if (!p) {
               return e;
             }
           }
         }
         if (B) {
-          t = $a(t, A);
+          t = cb(t, A);
           z = t.length;
           if (!z && !p) {
             return e;
@@ -1790,9 +1818,9 @@ function $a(a, b) {
         u.push(g.db.tag(m[n + 1], b, r, !1));
       }
     }
-    var Jb = this;
+    var Mb = this;
     return Promise.all(u).then(function(P) {
-      return P.length ? Jb.search(a, b, c, P) : P;
+      return P.length ? Mb.search(a, b, c, P) : P;
     });
   }
   if (!f) {
@@ -1805,27 +1833,27 @@ function $a(a, b) {
   r = 0;
   for (p = void 0; r < g.length; r++) {
     p = e[r];
-    n && p.length && !p[0].doc && (this.db ? u.push(p = this.index.get(this.field[0]).db.enrich(p)) : p.length && (p = bb.call(this, p)));
+    n && p.length && !p[0].doc && (this.db ? u.push(p = this.index.get(this.field[0]).db.enrich(p)) : p.length && (p = eb.call(this, p)));
     if (h) {
       return p;
     }
     e[r] = {field:g[r], result:p};
   }
   if (n && this.db && u.length) {
-    var Da = this;
+    var Ea = this;
     return Promise.all(u).then(function(P) {
       for (var Q = 0; Q < P.length; Q++) {
         e[Q].result = P[Q];
       }
-      return k ? cb(e, b) : q ? db(e, a, Da.index, Da.field, Da.I, q) : e;
+      return k ? fb(e, b) : q ? gb(e, a, Ea.index, Ea.field, Ea.I, q) : e;
     });
   }
-  return k ? cb(e, b) : q ? db(e, a, this.index, this.field, this.I, q) : e;
+  return k ? fb(e, b) : q ? gb(e, a, this.index, this.field, this.I, q) : e;
 };
-function db(a, b, c, d, e, g) {
+function gb(a, b, c, d, e, g) {
   for (var f, h, k, l = 0, m, n, p; l < a.length; l++) {
     for (m = a[l].result, n = a[l].field, k = c.get(n), p = k.encoder, k = k.tokenize, n = e[d.indexOf(n)], p !== f && (f = p, h = f.encode(b)), p = 0; p < m.length; p++) {
-      var q = "", r = xa(m[p].doc, n), u = f.encode(r);
+      var q = "", r = za(m[p].doc, n), u = f.encode(r);
       r = r.split(f.split);
       for (var w = 0, x, t; w < u.length; w++) {
         x = u[w];
@@ -1853,8 +1881,8 @@ function db(a, b, c, d, e, g) {
   }
   return a;
 }
-function cb(a, b) {
-  for (var c = [], d = M(), e = 0, g, f; e < a.length; e++) {
+function fb(a, b) {
+  for (var c = [], d = J(), e = 0, g, f; e < a.length; e++) {
     g = a[e];
     f = g.result;
     for (var h = 0, k, l, m; h < f.length; h++) {
@@ -1871,7 +1899,7 @@ function cb(a, b) {
   }
   return c;
 }
-function ab(a, b, c, d, e) {
+function db(a, b, c, d, e) {
   var g = this.tag.get(a);
   if (!g) {
     return console.warn("Tag '" + a + "' was not found"), [];
@@ -1880,25 +1908,25 @@ function ab(a, b, c, d, e) {
     if (a > c || d) {
       g = g.slice(d, d + c);
     }
-    e && (g = bb.call(this, g));
+    e && (g = eb.call(this, g));
     return g;
   }
 }
-function bb(a) {
+function eb(a) {
   for (var b = Array(a.length), c = 0, d; c < a.length; c++) {
     d = a[c], b[c] = {id:d, doc:this.store.get(d)};
   }
   return b;
 }
 ;function V(a) {
-  if (!this) {
+  if (this.constructor !== V) {
     return new V(a);
   }
   var b = a.document || a.doc || a, c, d;
   this.I = [];
   this.field = [];
   this.T = [];
-  this.key = (c = b.key || b.id) && eb(c, this.T) || "id";
+  this.key = (c = b.key || b.id) && hb(c, this.T) || "id";
   (d = a.keystore || 0) && (this.keystore = d);
   this.reg = (this.fastupdate = !!a.fastupdate) ? d ? new T(d) : new Map() : d ? new U(d) : new Set();
   this.H = (c = b.store || null) && !0 !== c && [];
@@ -1906,7 +1934,7 @@ function bb(a) {
   this.cache = (c = a.cache || null) && new W(c);
   a.cache = !1;
   this.worker = a.worker;
-  this.index = fb.call(this, a, b);
+  this.index = ib.call(this, a, b);
   this.tag = null;
   if (c = b.tag) {
     if ("string" === typeof c && (c = [c]), c.length) {
@@ -1920,7 +1948,7 @@ function bb(a) {
         if (!e) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
-        d.custom ? this.M[b] = d.custom : (this.M[b] = eb(e, this.T), d.filter && ("string" === typeof this.M[b] && (this.M[b] = new String(this.M[b])), this.M[b].R = d.filter));
+        d.custom ? this.M[b] = d.custom : (this.M[b] = hb(e, this.T), d.filter && ("string" === typeof this.M[b] && (this.M[b] = new String(this.M[b])), this.M[b].R = d.filter));
         this.$[b] = e;
         this.tag.set(e, new Map());
       }
@@ -1954,7 +1982,7 @@ v.mount = function(a) {
     for (var c = 0, d; c < this.$.length; c++) {
       d = this.$[c];
       var e;
-      this.index.set(d, e = new R({}, this.reg));
+      this.index.set(d, e = new O({}, this.reg));
       b === this.field && (b = b.slice(0));
       b.push(d);
       e.tag = this.tag.get(d);
@@ -1977,7 +2005,7 @@ v.mount = function(a) {
 };
 v.commit = function(a, b) {
   var c = this, d, e, g, f;
-  return I(function(h) {
+  return ta(function(h) {
     if (1 == h.h) {
       d = [];
       e = y(c.index.values());
@@ -1996,29 +2024,29 @@ v.destroy = function() {
   }
   return Promise.all(a);
 };
-function fb(a, b) {
+function ib(a, b) {
   var c = new Map(), d = b.index || b.field || b;
-  N(d) && (d = [d]);
+  K(d) && (d = [d]);
   for (var e = 0, g, f = void 0; e < d.length; e++) {
     g = d[e];
-    N(g) || (f = g, g = g.field);
-    f = O(f) ? Object.assign({}, a, f) : a;
+    K(g) || (f = g, g = g.field);
+    f = M(f) ? Object.assign({}, a, f) : a;
     if (this.worker) {
-      var h = new Ka(f);
+      var h = new R(f);
       c.set(g, h);
     }
-    this.worker || c.set(g, new R(f, this.reg));
-    f.custom ? this.I[e] = f.custom : (this.I[e] = eb(g, this.T), f.filter && ("string" === typeof this.I[e] && (this.I[e] = new String(this.I[e])), this.I[e].R = f.filter));
+    this.worker || c.set(g, new O(f, this.reg));
+    f.custom ? this.I[e] = f.custom : (this.I[e] = hb(g, this.T), f.filter && ("string" === typeof this.I[e] && (this.I[e] = new String(this.I[e])), this.I[e].R = f.filter));
     this.field[e] = g;
   }
   if (this.H) {
-    for (a = b.store, N(a) && (a = [a]), b = 0; b < a.length; b++) {
-      d = a[b], e = d.field || d, d.custom ? (this.H[b] = d.custom, d.custom.la = e) : (this.H[b] = eb(e, this.T), d.filter && ("string" === typeof this.H[b] && (this.H[b] = new String(this.H[b])), this.H[b].R = d.filter));
+    for (a = b.store, K(a) && (a = [a]), b = 0; b < a.length; b++) {
+      d = a[b], e = d.field || d, d.custom ? (this.H[b] = d.custom, d.custom.la = e) : (this.H[b] = hb(e, this.T), d.filter && ("string" === typeof this.H[b] && (this.H[b] = new String(this.H[b])), this.H[b].R = d.filter));
     }
   }
   return c;
 }
-function eb(a, b) {
+function hb(a, b) {
   for (var c = a.split(":"), d = 0, e = 0; e < c.length; e++) {
     a = c[e], "]" === a[a.length - 1] && (a = a.substring(0, a.length - 2)) && (b[d] = !0), a && (c[d++] = a);
   }
@@ -2032,7 +2060,7 @@ v.update = function(a, b) {
   return this.remove(a).add(a, b);
 };
 v.remove = function(a) {
-  O(a) && (a = xa(a, this.key));
+  M(a) && (a = za(a, this.key));
   for (var b = y(this.index.values()), c = b.next(); !c.done; c = b.next()) {
     c.value.remove(a, !0);
   }
@@ -2085,63 +2113,71 @@ v.set = function(a, b) {
   this.store.set(a, b);
   return this;
 };
-v.searchCache = gb;
-v.export = function(a, b, c, d, e, g) {
-  var f;
-  "undefined" === typeof g && (f = new Promise(function(k) {
-    g = 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++, g) || (d++, b.export(a, b, c, d, 1, g));
-  } else {
-    switch(e) {
-      case 1:
-        b = "tag";
-        h = this.A;
-        c = null;
-        break;
-      case 2:
-        b = "store";
-        h = this.store;
-        c = null;
-        break;
-      default:
-        g();
-        return;
+v.searchCache = jb;
+v.export = function(a, b, c, d) {
+  c = void 0 === c ? 0 : c;
+  d = void 0 === d ? 0 : d;
+  if (c < this.field.length) {
+    var e = this.field[c];
+    if ((b = this.index.get(e).export(a, e, c, d = 1)) && b.then) {
+      var g = this;
+      return b.then(function() {
+        return g.export(a, e, c + 1, d = 0);
+      });
     }
-    Pa(a, this, c, b, d, e, h, g);
+    return this.export(a, e, c + 1, d = 0);
   }
-  return f;
+  switch(d) {
+    case 0:
+      var f = "reg";
+      var h = Ra(this.reg);
+      b = null;
+      break;
+    case 1:
+      f = "tag";
+      h = Qa(this.tag);
+      b = null;
+      break;
+    case 2:
+      f = "doc";
+      h = Pa(this.store);
+      b = null;
+      break;
+    case 3:
+      f = "cfg";
+      h = {};
+      b = null;
+      break;
+    default:
+      return;
+  }
+  return Sa.call(this, a, b, f, c, d, h);
 };
 v.import = function(a, b) {
   if (b) {
-    switch(N(b) && (b = JSON.parse(b)), a) {
+    switch(K(b) && (b = JSON.parse(b)), a) {
       case "tag":
-        this.A = b;
         break;
       case "reg":
         this.fastupdate = !1;
-        this.reg = b;
-        a = 0;
-        for (var c; a < this.field.length; a++) {
-          c = this.index[this.field[a]], c.reg = b, c.fastupdate = !1;
+        this.reg = new Set(b);
+        for (a = 0; a < this.field.length; a++) {
+          b = this.index.get(this.field[a]), b.fastupdate = !1, b.reg = this.reg;
         }
         break;
-      case "store":
-        this.store = b;
+      case "doc":
+        this.store = new Map(b);
         break;
       default:
-        a = a.split("."), c = a[0], a = a[1], c && a && this.index[c].import(a, b);
+        a = a.split(".");
+        var c = a[0];
+        a = a[1];
+        c && a && this.index.get(c).import(a, b);
     }
   }
 };
 Na(V.prototype);
-function gb(a, b, c) {
+function jb(a, b, c) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
   var d = this.cache.get(a);
   if (!d) {
@@ -2182,49 +2218,49 @@ W.prototype.clear = function() {
   this.cache.clear();
   this.h = "";
 };
-var hb = {normalize:function(a) {
+var kb = {normalize:function(a) {
   return a.toLowerCase();
 }, dedupe:!1};
-var ib = new Map([["b", "p"], ["v", "f"], ["w", "f"], ["z", "s"], ["x", "s"], ["d", "t"], ["n", "m"], ["c", "k"], ["g", "k"], ["j", "k"], ["q", "k"], ["i", "e"], ["y", "e"], ["u", "o"]]);
-var jb = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), kb = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
-var lb = {a:"", e:"", i:"", o:"", u:"", y:"", b:1, f:1, p:1, v:1, c:2, g:2, j:2, k:2, q:2, s:2, x:2, z:2, "\u00df":2, d:3, t:3, l:4, m:5, n:5, r:6};
-var mb = /[\x00-\x7F]+/g;
-var nb = /[\x00-\x7F]+/g;
-var ob = /[\x00-\x7F]+/g;
-var pb = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:hb, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:ib}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:ib, matcher:jb, replacer:kb}, LatinExtra:{normalize:!0, dedupe:!0, mapper:ib, replacer:kb.concat([/(?!^)[aeo]/g, ""]), matcher:jb}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
+var lb = new Map([["b", "p"], ["v", "f"], ["w", "f"], ["z", "s"], ["x", "s"], ["d", "t"], ["n", "m"], ["c", "k"], ["g", "k"], ["j", "k"], ["q", "k"], ["i", "e"], ["y", "e"], ["u", "o"]]);
+var mb = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), nb = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
+var ob = {a:"", e:"", i:"", o:"", u:"", y:"", b:1, f:1, p:1, v:1, c:2, g:2, j:2, k:2, q:2, s:2, x:2, z:2, "\u00df":2, d:3, t:3, l:4, m:5, n:5, r:6};
+var pb = /[\x00-\x7F]+/g;
+var qb = /[\x00-\x7F]+/g;
+var rb = /[\x00-\x7F]+/g;
+var sb = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:kb, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:lb}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:lb, matcher:mb, replacer:nb}, LatinExtra:{normalize:!0, dedupe:!0, mapper:lb, replacer:nb.concat([/(?!^)[aeo]/g, ""]), matcher:mb}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
   for (var b = 0; b < a.length; b++) {
-    for (var c = a[b], d = c.charAt(0), e = lb[d], g = 1, f; g < c.length && (f = c.charAt(g), "h" === f || "w" === f || !(f = lb[f]) || f === e || (d += f, e = f, 4 !== d.length)); g++) {
+    for (var c = a[b], d = c.charAt(0), e = ob[d], g = 1, f; g < c.length && (f = c.charAt(g), "h" === f || "w" === f || !(f = ob[f]) || f === e || (d += f, e = f, 4 !== d.length)); g++) {
     }
     a[b] = d;
   }
 }}, ArabicDefault:{rtl:!0, normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(mb, " ");
+  return ("" + a).replace(pb, " ");
 }}, CjkDefault:{normalize:!1, dedupe:!0, split:"", prepare:function(a) {
-  return ("" + a).replace(nb, "");
+  return ("" + a).replace(qb, "");
 }}, CyrillicDefault:{normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(ob, " ");
+  return ("" + a).replace(rb, " ");
 }}};
-var qb = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
-M();
-R.prototype.add = function(a, b, c, d) {
+var tb = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
+J();
+O.prototype.add = function(a, b, c, d) {
   if (b && (a || 0 === a)) {
     if (!d && !c && this.reg.has(a)) {
       return this.update(a, b);
     }
     b = this.encoder.encode(b);
     if (d = b.length) {
-      for (var e = M(), g = M(), f = this.depth, h = this.resolution, k = 0; k < d; k++) {
+      for (var e = J(), g = J(), f = this.depth, h = this.resolution, k = 0; k < d; k++) {
         var l = b[this.rtl ? d - 1 - k : k], m = l.length;
         if (m && (f || !g[l])) {
-          var n = this.score ? this.score(b, l, k, null, 0) : rb(h, d, k), p = "";
+          var n = this.score ? this.score(b, l, k, null, 0) : ub(h, d, k), p = "";
           switch(this.tokenize) {
             case "full":
               if (2 < m) {
                 for (n = 0; n < m; n++) {
                   for (var q = m; q > n; q--) {
                     p = l.substring(n, q);
-                    var r = this.score ? this.score(b, l, k, p, n) : rb(h, d, k, m, n);
-                    sb(this, g, p, r, a, c);
+                    var r = this.score ? this.score(b, l, k, p, n) : ub(h, d, k, m, n);
+                    vb(this, g, p, r, a, c);
                   }
                 }
                 break;
@@ -2232,24 +2268,24 @@ R.prototype.add = function(a, b, c, d) {
             case "reverse":
               if (1 < m) {
                 for (q = m - 1; 0 < q; q--) {
-                  p = l[q] + p, r = this.score ? this.score(b, l, k, p, q) : rb(h, d, k, m, q), sb(this, g, p, r, a, c);
+                  p = l[q] + p, r = this.score ? this.score(b, l, k, p, q) : ub(h, d, k, m, q), vb(this, g, p, r, a, c);
                 }
                 p = "";
               }
             case "forward":
               if (1 < m) {
                 for (q = 0; q < m; q++) {
-                  p += l[q], sb(this, g, p, n, a, c);
+                  p += l[q], vb(this, g, p, n, a, c);
                 }
                 break;
               }
             default:
-              if (sb(this, g, l, n, a, c), f && 1 < d && k < d - 1) {
-                for (m = M(), p = this.aa, n = l, q = Math.min(f + 1, d - k), r = m[n] = 1; r < q; r++) {
+              if (vb(this, g, l, n, a, c), f && 1 < d && k < d - 1) {
+                for (m = J(), p = this.aa, n = l, q = Math.min(f + 1, d - k), r = m[n] = 1; r < q; r++) {
                   if ((l = b[this.rtl ? d - 1 - k - r : k + r]) && !m[l]) {
                     m[l] = 1;
-                    var u = this.score ? this.score(b, n, k, l, r) : rb(p + (d / 2 > p ? 0 : 1), d, k, q - 1, r - 1), w = this.bidirectional && l > n;
-                    sb(this, e, w ? n : l, u, a, c, w ? l : n);
+                    var u = this.score ? this.score(b, n, k, l, r) : ub(p + (d / 2 > p ? 0 : 1), d, k, q - 1, r - 1), w = this.bidirectional && l > n;
+                    vb(this, e, w ? n : l, u, a, c, w ? l : n);
                   }
                 }
               }
@@ -2261,13 +2297,13 @@ R.prototype.add = function(a, b, c, d) {
       b = "";
     }
   }
-  this.db && (b || this.commit_task.push({del:a}), this.da && tb(this));
+  this.db && (b || this.commit_task.push({del:a}), this.da && wb(this));
   return this;
 };
-function sb(a, b, c, d, e, g, f) {
+function vb(a, b, c, d, e, g, f) {
   var h = f ? a.ctx : a.map, k;
   if (!b[c] || f && !(k = b[c])[f]) {
-    if (f ? (b = k || (b[c] = M()), 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 (f ? (b = k || (b[c] = J()), b[f] = 1, (k = h.get(f)) ? h = k : h.set(f, h = new Map())) : b[c] = 1, (k = h.get(c)) ? h = k : h.set(c, h = k = []), h = h[d] || (h[d] = []), !g || !h.includes(e)) {
       if (h.length === Math.pow(2, 31) - 1) {
         b = new S(h);
         if (a.fastupdate) {
@@ -2282,12 +2318,12 @@ function sb(a, b, c, d, e, g, f) {
     }
   }
 }
-function rb(a, b, c, d, e) {
+function ub(a, b, c, d, e) {
   return c && 1 < a ? b + (d || 0) <= a ? c + (e || 0) : (a - 1) / (b + (d || 0)) * (c + (e || 0)) + 1 | 0 : 0;
 }
 ;function X(a, b, c, d) {
   if (1 === a.length) {
-    return a = a[0], a = c || a.length > b ? b ? a.slice(c, c + b) : a.slice(c) : a, d ? ub(a) : a;
+    return a = a[0], a = c || a.length > b ? b ? a.slice(c, c + b) : a.slice(c) : a, d ? xb(a) : a;
   }
   for (var e = [], g = 0, f = void 0, h = void 0; g < a.length; g++) {
     if ((f = a[g]) && (h = f.length)) {
@@ -2302,7 +2338,7 @@ function rb(a, b, c, d, e) {
         h > b && (f = f.slice(0, b), h = f.length), e.push(f);
       } else {
         if (h >= b) {
-          return h > b && (f = f.slice(0, b)), d ? ub(f) : f;
+          return h > b && (f = f.slice(0, b)), d ? xb(f) : f;
         }
         e = [f];
       }
@@ -2316,9 +2352,9 @@ function rb(a, b, c, d, e) {
     return e;
   }
   e = 1 < e.length ? [].concat.apply([], e) : e[0];
-  return d ? ub(e) : e;
+  return d ? xb(e) : e;
 }
-function ub(a) {
+function xb(a) {
   for (var b = 0; b < a.length; b++) {
     a[b] = {score:b, id:a[b]};
   }
@@ -2365,19 +2401,19 @@ function ub(a) {
   if (c.length) {
     return Promise.all(c).then(function() {
       a.result.length && (d = d.concat([a.result]));
-      a.result = vb(d, e, g, f, h, a.J);
+      a.result = yb(d, e, g, f, h, a.J);
       return h ? a.result : a;
     });
   }
-  d.length && (this.result.length && (d = d.concat([this.result])), this.result = vb(d, e, g, f, h, this.J));
+  d.length && (this.result.length && (d = d.concat([this.result])), this.result = yb(d, e, g, f, h, this.J));
   return h ? this.result : this;
 };
-function vb(a, b, c, d, e, g) {
+function yb(a, b, c, d, e, g) {
   if (!a.length) {
     return a;
   }
   "object" === typeof b && (c = b.offset || 0, d = b.enrich || !1, b = b.limit || 0);
-  return 2 > a.length ? e ? X(a[0], b, c, d) : a[0] : Za(a, c, b, e, g);
+  return 2 > a.length ? e ? X(a[0], b, c, d) : a[0] : bb(a, c, b, e, g);
 }
 ;Y.prototype.and = function() {
   if (this.result.length) {
@@ -2424,24 +2460,24 @@ function vb(a, b, c, d, e, g) {
     if (c.length) {
       return Promise.all(c).then(function() {
         d = [a.result].concat(d);
-        a.result = wb(d, e, g, f, a.J, h);
+        a.result = zb(d, e, g, f, a.J, h);
         return f ? a.result : a;
       });
     }
     d = [this.result].concat(d);
-    this.result = wb(d, e, g, f, this.J, h);
+    this.result = zb(d, e, g, f, this.J, h);
     return f ? this.result : this;
   }
   return this;
 };
-function wb(a, b, c, d, e, g) {
+function zb(a, b, c, d, e, g) {
   if (2 > a.length) {
     return [];
   }
   var f = [];
-  M();
-  var h = ya(a);
-  return h ? Ya(a, h, b, c, g, e, d) : f;
+  J();
+  var h = Aa(a);
+  return h ? ab(a, h, b, c, g, e, d) : f;
 }
 ;Y.prototype.xor = function() {
   var a = this, b = arguments, c = b[0];
@@ -2484,14 +2520,14 @@ function wb(a, b, c, d, e, g) {
   if (c.length) {
     return Promise.all(c).then(function() {
       a.result.length && (d = [a.result].concat(d));
-      a.result = xb(d, e, g, f, !h, a.J);
+      a.result = Ab(d, e, g, f, !h, a.J);
       return h ? a.result : a;
     });
   }
-  d.length && (this.result.length && (d = [this.result].concat(d)), this.result = xb(d, e, g, f, !h, a.J));
+  d.length && (this.result.length && (d = [this.result].concat(d)), this.result = Ab(d, e, g, f, !h, a.J));
   return h ? this.result : this;
 };
-function xb(a, b, c, d, e, g) {
+function Ab(a, b, c, d, e, g) {
   if (!a.length) {
     return a;
   }
@@ -2499,7 +2535,7 @@ function xb(a, b, c, d, e, g) {
     return e ? X(a[0], b, c, d) : a[0];
   }
   d = [];
-  for (var f = M(), h = 0, k = 0, l; k < a.length; k++) {
+  for (var f = J(), h = 0, k = 0, l; k < a.length; k++) {
     if (l = a[k]) {
       for (var m = 0, n; m < l.length; m++) {
         if (n = l[m]) {
@@ -2580,14 +2616,14 @@ function xb(a, b, c, d, e, g) {
   }
   if (c.length) {
     return Promise.all(c).then(function() {
-      a.result = yb.call(a, d, e, g, f);
+      a.result = Bb.call(a, d, e, g, f);
       return f ? a.result : a;
     });
   }
-  d.length && (this.result = yb.call(this, d, e, g, f));
+  d.length && (this.result = Bb.call(this, d, e, g, f));
   return f ? this.result : this;
 };
-function yb(a, b, c, d) {
+function Bb(a, b, c, d) {
   if (!a.length) {
     return this.result;
   }
@@ -2617,7 +2653,7 @@ function yb(a, b, c, d) {
   return e;
 }
 ;function Y(a) {
-  if (!this) {
+  if (this.constructor !== Y) {
     return new Y(a);
   }
   if (a && a.index) {
@@ -2658,14 +2694,14 @@ Y.prototype.boost = function(a) {
   return this;
 };
 Y.prototype.resolve = function(a, b, c) {
-  zb = 1;
+  Cb = 1;
   var d = this.result;
   this.result = this.index = null;
   return d.length ? ("object" === typeof a && (c = a.enrich, b = a.offset, a = a.limit), X(d, a || 100, b, c)) : d;
 };
-var zb = 1;
-R.prototype.search = function(a, b, c) {
-  c || (!b && O(a) ? (c = a, a = "") : O(b) && (c = b, b = 0));
+var Cb = 1;
+O.prototype.search = function(a, b, c) {
+  c || (!b && M(a) ? (c = a, a = "") : M(b) && (c = b, b = 0));
   var d = [], e = 0, g;
   if (c) {
     a = c.query || a;
@@ -2673,26 +2709,26 @@ R.prototype.search = function(a, b, c) {
     e = c.offset || 0;
     var f = c.context;
     var h = c.suggest;
-    (g = zb && !1 !== c.resolve) || (zb = 0);
+    (g = Cb && !1 !== c.resolve) || (Cb = 0);
     var k = g && c.enrich;
     var l = c.boost;
     var m = this.db && c.tag;
   } else {
-    g = this.resolve || zb;
+    g = this.resolve || Cb;
   }
   a = this.encoder.encode(a);
   var n = a.length;
   b || !g || (b = 100);
   if (1 === n) {
-    return Ab.call(this, a[0], "", b, e, g, k, m);
+    return Db.call(this, a[0], "", b, e, g, k, m);
   }
   f = this.depth && !1 !== f;
   if (2 === n && f && !h) {
-    return Ab.call(this, a[0], a[1], b, e, g, k, m);
+    return Db.call(this, a[0], a[1], b, e, g, k, m);
   }
   var p = c = 0;
   if (1 < n) {
-    for (var q = M(), r = [], u = 0, w = void 0; u < n; u++) {
+    for (var q = J(), r = [], u = 0, w = void 0; u < n; u++) {
       if ((w = a[u]) && !q[w]) {
         if (h || this.db || Z(this, w)) {
           r.push(w), q[w] = 1;
@@ -2712,17 +2748,17 @@ R.prototype.search = function(a, b, c) {
   }
   var x = 0;
   if (1 === n) {
-    return Ab.call(this, a[0], "", b, e, g, k, m);
+    return Db.call(this, a[0], "", b, e, g, k, m);
   }
   if (2 === n && f && !h) {
-    return Ab.call(this, a[0], a[1], b, e, g, k, m);
+    return Db.call(this, a[0], a[1], b, e, g, k, m);
   }
   if (1 < n) {
     if (f) {
       var t = a[0];
       x = 1;
     } else {
-      9 < c && 3 < c / p && a.sort(va);
+      9 < c && 3 < c / p && a.sort(xa);
     }
   }
   if (this.db) {
@@ -2732,7 +2768,7 @@ R.prototype.search = function(a, b, c) {
     var z = this;
     return function() {
       var A, B, D;
-      return I(function(F) {
+      return ta(function(F) {
         switch(F.h) {
           case 1:
             B = A = void 0;
@@ -2745,11 +2781,11 @@ R.prototype.search = function(a, b, c) {
             return t ? G(F, Z(z, B, t, 0, 0, !1, !1), 8) : G(F, Z(z, B, "", 0, 0, !1, !1), 7);
           case 7:
             A = F.F;
-            A = Bb(A, d, h, z.resolution);
+            A = Eb(A, d, h, z.resolution);
             F.h = 6;
             break;
           case 8:
-            A = F.F, A = Bb(A, d, h, z.aa), h && !1 === A && d.length || (t = B);
+            A = F.F, A = Eb(A, d, h, z.aa), h && !1 === A && d.length || (t = B);
           case 6:
             if (A) {
               return F.return(A);
@@ -2774,14 +2810,14 @@ R.prototype.search = function(a, b, c) {
             F.h = 2;
             break;
           case 4:
-            return F.return(g ? Ya(d, z.resolution, b, e, h, l, g) : new Y(d[0]));
+            return F.return(g ? ab(d, z.resolution, b, e, h, l, g) : new Y(d[0]));
         }
       });
     }();
   }
   for (k = f = void 0; x < n; x++) {
     k = a[x];
-    t ? (f = Z(this, k, t, 0, 0, !1, !1), f = Bb(f, d, h, this.aa), h && !1 === f && d.length || (t = k)) : (f = Z(this, k, "", 0, 0, !1, !1), f = Bb(f, d, h, this.resolution));
+    t ? (f = Z(this, k, t, 0, 0, !1, !1), f = Eb(f, d, h, this.aa), h && !1 === f && d.length || (t = k)) : (f = Z(this, k, "", 0, 0, !1, !1), f = Eb(f, d, h, this.resolution));
     if (f) {
       return f;
     }
@@ -2800,16 +2836,16 @@ R.prototype.search = function(a, b, c) {
       }
     }
   }
-  d = Ya(d, this.resolution, b, e, h, l, g);
+  d = ab(d, this.resolution, b, e, h, l, g);
   return g ? d : new Y(d);
 };
-function Ab(a, b, c, d, e, g, f) {
+function Db(a, b, c, d, e, g, f) {
   a = Z(this, a, b, c, d, e, g, f);
   return this.db ? a.then(function(h) {
     return e ? h : h && h.length ? e ? X(h, c, d) : new Y(h) : e ? [] : new Y([]);
   }) : a && a.length ? e ? X(a, c, d) : new Y(a) : e ? [] : new Y([]);
 }
-function Bb(a, b, c, d) {
+function Eb(a, b, c, d) {
   var e = [];
   if (a) {
     d = Math.min(a.length, d);
@@ -2832,7 +2868,7 @@ function Z(a, b, c, d, e, g, f, h) {
   a = c ? (a = a.ctx.get(k ? b : c)) && a.get(k ? c : b) : a.map.get(b);
   return a;
 }
-;R.prototype.remove = function(a, b) {
+;O.prototype.remove = function(a, b) {
   var c = this.reg.size && (this.fastupdate ? this.reg.get(a) : this.reg.has(a));
   if (c) {
     if (this.fastupdate) {
@@ -2847,15 +2883,15 @@ function Z(a, b, c, d, e, g, f, h) {
         }
       }
     } else {
-      Cb(this.map, a), this.depth && Cb(this.ctx, a);
+      Fb(this.map, a), this.depth && Fb(this.ctx, a);
     }
     b || this.reg.delete(a);
   }
-  this.db && (this.commit_task.push({del:a}), this.da && tb(this));
+  this.db && (this.commit_task.push({del:a}), this.da && wb(this));
   this.cache && this.cache.remove(a);
   return this;
 };
-function Cb(a, b) {
+function Fb(a, b) {
   var c = 0;
   if (a.constructor === Array) {
     for (var d = 0, e = void 0, g; d < a.length; d++) {
@@ -2870,24 +2906,24 @@ function Cb(a, b) {
     }
   } else {
     for (d = y(a), e = d.next(); !e.done; e = d.next()) {
-      g = e.value, e = g[0], (g = Cb(g[1], b)) ? c += g : a.delete(e);
+      g = e.value, e = g[0], (g = Fb(g[1], b)) ? c += g : a.delete(e);
     }
   }
   return c;
 }
-;function R(a, b) {
-  if (!this) {
-    return new R(a);
+;function O(a, b) {
+  if (this.constructor !== O) {
+    return new O(a);
   }
   if (a) {
-    var c = N(a) ? a : a.preset;
-    c && (qb[c] || console.warn("Preset not found: " + c), a = Object.assign({}, qb[c], a));
+    var c = K(a) ? a : a.preset;
+    c && (tb[c] || console.warn("Preset not found: " + c), a = Object.assign({}, tb[c], a));
   } else {
     a = {};
   }
   c = a.context || {};
-  var d = N(a.encoder) ? pb[a.encoder] : a.encode || a.encoder || hb;
-  this.encoder = d.encode ? d : "object" === typeof d ? new Ga(d) : {encode:d};
+  var d = K(a.encoder) ? sb[a.encoder] : a.encode || a.encoder || kb;
+  this.encoder = d.encode ? d : "object" === typeof d ? new N(d) : {encode:d};
   var e;
   this.resolution = a.resolution || 9;
   this.tokenize = e = a.tokenize || "strict";
@@ -2910,7 +2946,7 @@ function Cb(a, b) {
   this.commit_task = [];
   this.commit_timer = null;
 }
-v = R.prototype;
+v = O.prototype;
 v.mount = function(a) {
   this.commit_timer && (clearTimeout(this.commit_timer), this.commit_timer = null);
   return a.mount(this);
@@ -2923,7 +2959,7 @@ v.destroy = function() {
   this.commit_timer && (clearTimeout(this.commit_timer), this.commit_timer = null);
   return this.db.destroy();
 };
-function tb(a) {
+function wb(a) {
   a.commit_timer || (a.commit_timer = setTimeout(function() {
     a.commit_timer = null;
     a.db.commit(a, void 0, void 0);
@@ -2949,7 +2985,7 @@ v.update = function(a, b) {
     return c.add(a, b);
   }) : this.add(a, b);
 };
-function Db(a) {
+function Gb(a) {
   var b = 0;
   if (a.constructor === Array) {
     for (var c = 0, d = void 0; c < a.length; c++) {
@@ -2959,7 +2995,7 @@ function Db(a) {
     for (c = y(a), d = c.next(); !d.done; d = c.next()) {
       var e = d.value;
       d = e[0];
-      (e = Db(e[1])) ? b += e : a.delete(d);
+      (e = Gb(e[1])) ? b += e : a.delete(d);
     }
   }
   return b;
@@ -2968,62 +3004,47 @@ v.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
-  Db(this.map);
-  this.depth && Db(this.ctx);
+  Gb(this.map);
+  this.depth && Gb(this.ctx);
   return this;
 };
-v.searchCache = gb;
-v.export = function(a, b, c, d, e, g) {
-  var f = !0;
-  "undefined" === typeof g && (f = new Promise(function(n) {
-    g = n;
-  }));
-  switch(e || (e = 0)) {
+v.searchCache = jb;
+v.export = function(a, b, c, d) {
+  d = void 0 === d ? 0 : d;
+  switch(d) {
     case 0:
-      var h = "reg";
-      if (this.fastupdate) {
-        var k = M();
-        for (var l = y(this.reg.keys()), m = l.next(); !m.done; m = l.next()) {
-          k[m.value] = 1;
-        }
-      } else {
-        k = this.reg;
-      }
+      var e = "reg";
+      var g = Ra(this.reg);
       break;
     case 1:
-      h = "cfg";
-      k = {doc:0, opt:this.h ? 1 : 0};
+      e = "cfg";
+      g = {};
       break;
     case 2:
-      h = "map";
-      k = this.map;
+      e = "map";
+      g = Pa(this.map);
       break;
     case 3:
-      h = "ctx";
-      k = this.ctx;
+      e = "ctx";
+      g = Qa(this.ctx);
       break;
     default:
-      "undefined" === typeof c && g && g();
       return;
   }
-  Pa(a, b || this, c, h, d, e, k, g);
-  return f;
+  return Sa.call(this, a, b, e, c, d, g);
 };
 v.import = function(a, b) {
   if (b) {
-    switch(N(b) && (b = JSON.parse(b)), a) {
-      case "cfg":
-        this.h = !!b.opt;
-        break;
+    switch(K(b) && (b = JSON.parse(b)), a) {
       case "reg":
         this.fastupdate = !1;
-        this.reg = b;
+        this.reg = new Set(b);
         break;
       case "map":
-        this.map = b;
+        this.map = new Map(b);
         break;
       case "ctx":
-        this.ctx = b;
+        this.ctx = new Map(b);
     }
   }
 };
@@ -3079,12 +3100,12 @@ v.serialize = function(a) {
   e = "index.ctx=new Map([" + e + "]);";
   return a ? "function inject(index){" + b + d + e + "}" : b + d + e;
 };
-Na(R.prototype);
-var Eb = "undefined" !== typeof window && (window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB), Fb = ["map", "ctx", "tag", "reg", "cfg"];
-function Gb(a, b) {
+Na(O.prototype);
+var Hb = "undefined" !== typeof window && (window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB), Ib = ["map", "ctx", "tag", "reg", "cfg"];
+function Jb(a, b) {
   b = void 0 === b ? {} : b;
   if (!this) {
-    return new Gb(a, b);
+    return new Jb(a, b);
   }
   "object" === typeof a && (b = a = a.name);
   a || console.info("Default storage space was used, because a name was not passed.");
@@ -3094,7 +3115,7 @@ function Gb(a, b) {
   this.db = null;
   this.h = {};
 }
-v = Gb.prototype;
+v = Jb.prototype;
 v.mount = function(a) {
   if (!a.encoder) {
     return a.mount(this);
@@ -3106,10 +3127,10 @@ v.open = function() {
   var a = this;
   navigator.storage && navigator.storage.persist();
   return this.db || new Promise(function(b, c) {
-    var d = Eb.open(a.id + (a.field ? ":" + a.field : ""), 1);
+    var d = Hb.open(a.id + (a.field ? ":" + a.field : ""), 1);
     d.onupgradeneeded = function() {
       var e = a.db = this.result;
-      Fb.forEach(function(g) {
+      Ib.forEach(function(g) {
         e.objectStoreNames.contains(g) || e.createObjectStore(g);
       });
     };
@@ -3135,13 +3156,13 @@ v.close = function() {
   this.db = null;
 };
 v.destroy = function() {
-  return Eb.deleteDatabase(this.id + (this.field ? ":" + this.field : ""));
+  return Hb.deleteDatabase(this.id + (this.field ? ":" + this.field : ""));
 };
 v.clear = function() {
-  for (var a = this.db.transaction(Fb, "readwrite"), b = 0; b < Fb.length; b++) {
-    a.objectStore(Fb[b]).clear();
+  for (var a = this.db.transaction(Ib, "readwrite"), b = 0; b < Ib.length; b++) {
+    a.objectStore(Ib[b]).clear();
   }
-  return Hb(a);
+  return Kb(a);
 };
 v.get = function(a, b, c, d, e, g) {
   c = void 0 === c ? 0 : c;
@@ -3150,7 +3171,7 @@ v.get = function(a, b, c, d, e, g) {
   g = void 0 === g ? !1 : g;
   a = this.db.transaction(b ? "ctx" : "map", "readonly").objectStore(b ? "ctx" : "map").get(b ? b + ":" + a : a);
   var f = this;
-  return Hb(a).then(function(h) {
+  return Kb(a).then(function(h) {
     var k = [];
     if (!h || !h.length) {
       return k;
@@ -3185,7 +3206,7 @@ v.tag = function(a, b, c, d) {
   d = void 0 === d ? !1 : d;
   a = this.db.transaction("tag", "readonly").objectStore("tag").get(a);
   var e = this;
-  return Hb(a).then(function(g) {
+  return Kb(a).then(function(g) {
     if (!g || !g.length || c >= g.length) {
       return [];
     }
@@ -3199,7 +3220,7 @@ v.tag = function(a, b, c, d) {
 v.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] = Hb(b.get(a[d]));
+    c[d] = Kb(b.get(a[d]));
   }
   return Promise.all(c).then(function(e) {
     for (var g = 0; g < e.length; g++) {
@@ -3210,7 +3231,7 @@ v.enrich = function(a) {
 };
 v.has = function(a) {
   a = this.db.transaction("reg", "readonly").objectStore("reg").getKey(a);
-  return Hb(a);
+  return Kb(a);
 };
 v.search = null;
 v.info = function() {
@@ -3238,7 +3259,7 @@ v.transaction = function(a, b, c) {
 };
 v.commit = function(a, b, c) {
   var d = this, e, g, f;
-  return I(function(h) {
+  return ta(function(h) {
     switch(h.h) {
       case 1:
         if (b) {
@@ -3273,7 +3294,7 @@ v.commit = function(a, b, c) {
           h.h = 3;
           break;
         }
-        c || (e = e.concat(wa(a.reg)));
+        c || (e = e.concat(ya(a.reg)));
         if (!e.length) {
           h.h = 10;
           break;
@@ -3385,7 +3406,7 @@ v.commit = function(a, b, c) {
     }
   });
 };
-function Kb(a, b, c) {
+function Nb(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++) {
@@ -3412,17 +3433,17 @@ v.remove = function(a) {
   return Promise.all([this.transaction("map", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       var c = this.result;
-      c && Kb(c, a);
+      c && Nb(c, a);
     };
   }), this.transaction("ctx", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       var c = this.result;
-      c && Kb(c, a);
+      c && Nb(c, a);
     };
   }), this.transaction("tag", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       var c = this.result;
-      c && Kb(c, a, !0);
+      c && Nb(c, a, !0);
     };
   }), this.transaction("reg", "readwrite", function(b) {
     for (var c = 0; c < a.length; c++) {
@@ -3430,7 +3451,7 @@ v.remove = function(a) {
     }
   })]);
 };
-function Hb(a) {
+function Kb(a) {
   return new Promise(function(b, c) {
     a.onsuccess = function() {
       b(this.result);
@@ -3442,8 +3463,8 @@ function Hb(a) {
     a = null;
   });
 }
-;var Lb = {Index:R, Charset:pb, Encoder:Ga, Document:V, Worker:Ka, Resolver:Y, IndexedDB:Gb, Language:{}}, Mb = self, Nb;
-(Nb = Mb.define) && Nb.amd ? Nb([], function() {
-  return Lb;
-}) : "object" === typeof Mb.exports ? Mb.exports = Lb : Mb.FlexSearch = Lb;
+;var Ob = {Index:O, Charset:sb, Encoder:N, Document:V, Worker:R, Resolver:Y, IndexedDB:Jb, Language:{}}, Pb = self, Qb;
+(Qb = Pb.define) && Qb.amd ? Qb([], function() {
+  return Ob;
+}) : "object" === typeof Pb.exports ? Pb.exports = Ob : Pb.FlexSearch = Ob;
 }(this||self));
diff --git a/dist/flexsearch.es5.min.js b/dist/flexsearch.es5.min.js
index 00b97ea..9fdfbb8 100644
--- a/dist/flexsearch.es5.min.js
+++ b/dist/flexsearch.es5.min.js
@@ -5,130 +5,129 @@
  * Hosted by Nextapps GmbH
  * https://github.com/nextapps-de/flexsearch
  */
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+function(k){for(var l=x(a.ctx),m=l.next(),n={};!m.done;n={W:void 0},m=l.next()){m=m.value;n.W=m[0];m=x(m[1]);for(var p=m.next(),q={};!p.done;q={P:void 0,Z:void 0},p=m.next())p=p.value,q.Z=p[0],q.P=p[1],q.P.length&&(b?k.put(q.P,n.W+":"+q.Z):k.get(n.W+":"+q.Z).onsuccess=function(r,v){return function(){var w=this.result,y;if(w&&w.length)for(var t=Math.max(w.length,r.P.length),z=0,A;z<t;z++){if((A=r.P[z])&&A.length){if((y=w[z])&&y.length)for(var B=0;B<A.length;B++)y.push(A[B]);else w[z]=A;y=1}}else w=
+r.P,y=1;y&&k.put(w,v.W+":"+r.Z)}}(q,n))}}),14);case 14:if(a.store)return G(g,d.transaction("reg","readwrite",function(k){for(var l=x(a.store),m=l.next();!m.done;m=l.next()){var n=m.value;m=n[0];n=n[1];k.put("object"===typeof n?JSON.stringify(n):1,m)}}),16);if(a.bypass){g.h=16;break}return G(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 G(g,d.transaction("tag","readwrite",function(k){for(var l=
+x(a.tag),m=l.next(),n={};!m.done;n={X:void 0,ba:void 0},m=l.next())m=m.value,n.ba=m[0],n.X=m[1],n.X.length&&(k.get(n.ba).onsuccess=function(p){return function(){var q=this.result;q=q&&q.length?q.concat(p.X):p.X;k.put(q,p.ba)}}(n))}),20);case 20:a.map.clear(),a.ctx.clear(),a.tag&&a.tag.clear(),a.store&&a.store.clear(),a.document||a.reg.clear(),g.h=0}})};
+function Nb(a,b,c){for(var d=a.value,e,h,f=0,g=0,k;g<d.length;g++){if(k=c?d:d[g]){for(var l=0,m,n;l<b.length;l++)if(n=b[l],m=k.indexOf(h?parseInt(n,10):n),0>m&&!h&&"string"===typeof n&&!isNaN(n)&&(m=k.indexOf(parseInt(n,10)))&&(h=1),0<=m)if(e=1,1<k.length)k.splice(m,1);else{d[g]=[];break}f+=k.length}if(c)break}f?e&&a.update(d):a.delete();a.continue()}
+u.remove=function(a){"object"!==typeof a&&(a=[a]);return Promise.all([this.transaction("map","readwrite",function(b){b.openCursor().onsuccess=function(){var c=this.result;c&&Nb(c,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){var c=this.result;c&&Nb(c,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){var c=this.result;c&&Nb(c,a,!0)}}),this.transaction("reg","readwrite",function(b){for(var c=0;c<a.length;c++)b.delete(a[c])})])};
+function Mb(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 Ob={Index:O,Charset:sb,Encoder:N,Document:V,Worker:R,Resolver:Y,IndexedDB:Jb,Language:{}},Pb=self,Qb;(Qb=Pb.define)&&Qb.amd?Qb([],function(){return Ob}):"object"===typeof Pb.exports?Pb.exports=Ob:Pb.FlexSearch=Ob;}(this||self));
diff --git a/dist/flexsearch.light.debug.js b/dist/flexsearch.light.debug.js
index 5b5ec66..b5de2a1 100644
--- a/dist/flexsearch.light.debug.js
+++ b/dist/flexsearch.light.debug.js
@@ -51,7 +51,7 @@ function v(a, c) {
 }
 ;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) {
+  if (this.constructor !== C) {
     return new C(...arguments);
   }
   for (let c = 0; c < arguments.length; c++) {
@@ -509,7 +509,7 @@ function P(a, c) {
   return b;
 }
 ;function H(a, c) {
-  if (!this) {
+  if (this.constructor !== H) {
     return new H(a);
   }
   if (a) {
diff --git a/dist/flexsearch.light.min.js b/dist/flexsearch.light.min.js
index bb17bd2..c73e958 100644
--- a/dist/flexsearch.light.min.js
+++ b/dist/flexsearch.light.min.js
@@ -5,7 +5,7 @@
  * Hosted by Nextapps GmbH
  * https://github.com/nextapps-de/flexsearch
  */
-(function _f(self){'use strict';if(typeof module!=='undefined')self=module;else if(typeof process !== 'undefined')self=process;self._factory=_f;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])}
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 this.maxlength=t(a.maxlength,0,this.maxlength);if(this.cache=b=t(a.cache,!0,this.cache))this.j=null,this.v="number"===typeof b?b:2E5,this.h=new Map,this.i=new Map,this.l=this.g=128;this.m="";this.s=null;this.o="";this.u=null;if(this.matcher)for(const d of this.matcher.keys())this.m+=(this.m?"|":"")+d;if(this.stemmer)for(const d of this.stemmer.keys())this.o+=(this.o?"|":"")+d;return this};
@@ -19,7 +19,7 @@ function J(a,c,b,d,e,g,f){let h=f?a.ctx:a.map,k;if(!c[b]||f&&!(k=c[b])[f])f?(c=k
 h=Math.max(h,n);k=k?Math.min(k,n):n}a=m;b=a.length}if(!b)return d;p=0;if(1===b)return M.call(this,a[0],"",c,e);if(2===b&&g&&!f)return M.call(this,a[0],a[1],c,e);if(1<b)if(g){var q=a[0];p=1}else 9<h&&3<h/k&&a.sort(v);for(let m,r;p<b;p++){r=a[p];q?(m=N(this,r,q),m=O(m,d,f,this.A),f&&!1===m&&d.length||(q=r)):(m=N(this,r,""),m=O(m,d,f,this.resolution));if(m)return m;if(f&&p===b-1){g=d.length;if(!g){if(q){q="";p=-1;continue}return d}if(1===g)return L(d[0],c,e)}}a:{a=d;d=this.resolution;q=f;b=a.length;
 f=[];g=u();for(let m=0,r,l,n,A;m<d;m++)for(k=0;k<b;k++)if(n=a[k],m<n.length&&(r=n[m]))for(p=0;p<r.length;p++)l=r[p],(h=g[l])?g[l]++:(h=0,g[l]=1),A=f[h]||(f[h]=[]),A.push(l);if(a=f.length)if(q){if(1<f.length)b:for(a=[],d=u(),q=f.length,h=q-1;0<=h;h--)for(q=f[h],g=q.length,k=0;k<g;k++){if(b=q[k],!d[b])if(d[b]=1,e)e--;else if(a.push(b),a.length===c)break b}else a=(f=f[0]).length>c||e?f.slice(e,c+e):f;f=a}else{if(a<b){d=[];break a}f=f[a-1];if(c||e)if(f.length>c||e)f=f.slice(e,c+e)}d=f}return d};
 function M(a,c,b,d){return(a=N(this,a,c))&&a.length?L(a,b,d):[]}function O(a,c,b,d){let e=[];if(a){d=Math.min(a.length,d);for(let g=0,f;g<d;g++)(f=a[g])&&f&&(e[g]=f);if(e.length){c.push(e);return}}return!b&&e}function N(a,c,b){let d;b&&(d=a.bidirectional&&c>b);a=b?(a=a.ctx.get(d?c:b))&&a.get(d?b:c):a.map.get(c);return a};H.prototype.remove=function(a,c){const b=this.reg.size&&(this.fastupdate?this.reg.get(a):this.reg.has(a));if(b){if(this.fastupdate)for(let d=0,e;d<b.length;d++){if(e=b[d])if(2>e.length)e.pop();else{const g=e.indexOf(a);g===b.length-1?e.pop():e.splice(g,1)}}else P(this.map,a),this.depth&&P(this.ctx,a);c||this.reg.delete(a)}this.cache&&this.cache.remove(a);return this};
-function P(a,c){let b=0;if(a.constructor===Array)for(let d=0,e,g;d<a.length;d++){if((e=a[d])&&e.length)if(g=e.indexOf(c),0<=g){1<e.length?(e.splice(g,1),b++):delete a[d];break}else b++}else for(let d of a){const e=d[0],g=P(d[1],c);g?b+=g:a.delete(e)}return b};function H(a,c){if(!this)return new H(a);if(a){var b="string"===typeof a?a:a.preset;b&&(a=Object.assign({},G[b],a))}else a={};b=a.context||{};const d=a.encode||a.encoder||F;this.encoder=d.encode?d:"object"===typeof d?new C(d):{encode:d};let e;this.resolution=a.resolution||9;this.tokenize=e=a.tokenize||"strict";this.depth="strict"===e&&b.depth||0;this.bidirectional=!1!==b.bidirectional;this.fastupdate=!!a.fastupdate;this.score=a.score||null;e=!1;this.map=new Map;this.ctx=new Map;this.reg=c||(this.fastupdate?
-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){const b=this,d=this.remove(a);return d&&d.then?d.then(()=>b.add(a,c)):this.add(a,c)};
+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.constructor!==H)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){const b=this,d=this.remove(a);return d&&d.then?d.then(()=>b.add(a,c)):this.add(a,c)};
 function Q(a){let c=0;if(a.constructor===Array)for(let b=0,d;b<a.length;b++)(d=a[b])&&(c+=d.length);else for(const b of a){const d=b[0],e=Q(b[1]);e?c+=e:a.delete(d)}return c}H.prototype.cleanup=function(){if(!this.fastupdate)return this;Q(this.map);this.depth&&Q(this.ctx);return this};
 H.prototype.searchCache=function(a,c,b){a=("object"===typeof a?""+a.query:a).toLowerCase();let d=this.cache.get(a);if(!d){d=this.search(a,c,b);if(d.then){const e=this;d.then(function(g){e.cache.set(a,g);return g})}this.cache.set(a,d)}return d};const R={Index:H,Charset:null,Encoder:C,Document:null,Worker:null,Resolver:null,IndexedDB:null,Language:{}},S=self;let T;(T=S.define)&&T.amd?T([],function(){return R}):"object"===typeof S.exports?S.exports=R:S.FlexSearch=R;}(this||self));
diff --git a/dist/flexsearch.light.module.debug.js b/dist/flexsearch.light.module.debug.js
index 44ea2dc..b56ad9f 100644
--- a/dist/flexsearch.light.module.debug.js
+++ b/dist/flexsearch.light.module.debug.js
@@ -50,7 +50,7 @@ function v(a, c) {
 }
 ;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) {
+  if (this.constructor !== C) {
     return new C(...arguments);
   }
   for (let c = 0; c < arguments.length; c++) {
@@ -508,7 +508,7 @@ function P(a, c) {
   return b;
 }
 ;function H(a, c) {
-  if (!this) {
+  if (this.constructor !== H) {
     return new H(a);
   }
   if (a) {
diff --git a/dist/flexsearch.light.module.min.js b/dist/flexsearch.light.module.min.js
index ac5fc78..a3d94c0 100644
--- a/dist/flexsearch.light.module.min.js
+++ b/dist/flexsearch.light.module.min.js
@@ -5,7 +5,7 @@
  * Hosted by Nextapps GmbH
  * https://github.com/nextapps-de/flexsearch
  */
-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])}
+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.constructor!==C)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;try{this.split=new RegExp("["+(c?"^":"")+e+"]+","u")}catch(g){this.split=/\s+/}this.numeric=d}else{try{this.split=t(b,w,this.split)}catch(d){this.split=
 /\s+/}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);if(this.cache=b=t(a.cache,!0,this.cache))this.j=null,this.v="number"===typeof b?b:2E5,this.h=new Map,this.i=new Map,this.l=this.g=128;this.m="";this.s=null;this.o="";this.u=null;if(this.matcher)for(const d of this.matcher.keys())this.m+=(this.m?"|":"")+d;if(this.stemmer)for(const d of this.stemmer.keys())this.o+=(this.o?"|":"")+d;return this};
@@ -19,8 +19,8 @@ function K(a,c,b,d,e,g,f){let h=f?a.ctx:a.map,k;if(!c[b]||f&&!(k=c[b])[f])f?(c=k
 h=Math.max(h,n);k=k?Math.min(k,n):n}a=m;b=a.length}if(!b)return d;p=0;if(1===b)return M.call(this,a[0],"",c,e);if(2===b&&g&&!f)return M.call(this,a[0],a[1],c,e);if(1<b)if(g){var q=a[0];p=1}else 9<h&&3<h/k&&a.sort(v);for(let m,r;p<b;p++){r=a[p];q?(m=N(this,r,q),m=O(m,d,f,this.A),f&&!1===m&&d.length||(q=r)):(m=N(this,r,""),m=O(m,d,f,this.resolution));if(m)return m;if(f&&p===b-1){g=d.length;if(!g){if(q){q="";p=-1;continue}return d}if(1===g)return L(d[0],c,e)}}a:{a=d;d=this.resolution;q=f;b=a.length;
 f=[];g=u();for(let m=0,r,l,n,A;m<d;m++)for(k=0;k<b;k++)if(n=a[k],m<n.length&&(r=n[m]))for(p=0;p<r.length;p++)l=r[p],(h=g[l])?g[l]++:(h=0,g[l]=1),A=f[h]||(f[h]=[]),A.push(l);if(a=f.length)if(q){if(1<f.length)b:for(a=[],d=u(),q=f.length,h=q-1;0<=h;h--)for(q=f[h],g=q.length,k=0;k<g;k++){if(b=q[k],!d[b])if(d[b]=1,e)e--;else if(a.push(b),a.length===c)break b}else a=(f=f[0]).length>c||e?f.slice(e,c+e):f;f=a}else{if(a<b){d=[];break a}f=f[a-1];if(c||e)if(f.length>c||e)f=f.slice(e,c+e)}d=f}return d};
 function M(a,c,b,d){return(a=N(this,a,c))&&a.length?L(a,b,d):[]}function O(a,c,b,d){let e=[];if(a){d=Math.min(a.length,d);for(let g=0,f;g<d;g++)(f=a[g])&&f&&(e[g]=f);if(e.length){c.push(e);return}}return!b&&e}function N(a,c,b){let d;b&&(d=a.bidirectional&&c>b);a=b?(a=a.ctx.get(d?c:b))&&a.get(d?b:c):a.map.get(c);return a};I.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 I(a,c){if(!this)return new I(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)}I.prototype.clear=function(){this.map.clear();this.ctx.clear();this.reg.clear();this.cache&&this.cache.clear();return this};I.prototype.append=function(a,c){return this.add(a,c,!0)};I.prototype.contain=function(a){return this.reg.has(a)};I.prototype.update=function(a,c){const b=this,d=this.remove(a);return d&&d.then?d.then(()=>b.add(a,c)):this.add(a,c)};
+function 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 I(a,c){if(this.constructor!==I)return new I(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)}I.prototype.clear=function(){this.map.clear();this.ctx.clear();this.reg.clear();this.cache&&this.cache.clear();return this};I.prototype.append=function(a,c){return this.add(a,c,!0)};I.prototype.contain=function(a){return this.reg.has(a)};I.prototype.update=function(a,c){const b=this,d=this.remove(a);return d&&d.then?d.then(()=>b.add(a,c)):this.add(a,c)};
 function Q(a){let c=0;if(a.constructor===Array)for(let b=0,d;b<a.length;b++)(d=a[b])&&(c+=d.length);else for(const b of a){const d=b[0],e=Q(b[1]);e?c+=e:a.delete(d)}return c}I.prototype.cleanup=function(){if(!this.fastupdate)return this;Q(this.map);this.depth&&Q(this.ctx);return this};
 I.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(g){e.cache.set(a,g);return g})}this.cache.set(a,d)}return d};export default {Index:I,Charset:null,Encoder:C,Document:null,Worker:null,Resolver:null,IndexedDB:null,Language:{}};
 export const Index=I;export const Charset=null;export const Encoder=C;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/document.js b/dist/module-debug/document.js
index e7bc15a..2b188fb 100644
--- a/dist/module-debug/document.js
+++ b/dist/module-debug/document.js
@@ -24,7 +24,7 @@ import "./document/search.js";
 
 export default function Document(options) {
 
-    if (!this) {
+    if (this.constructor !== Document) {
         return new Document(options);
     }
 
@@ -40,9 +40,8 @@ export default function Document(options) {
     keystore = options.keystore || 0;
     keystore && (this.keystore = keystore);
     this.fastupdate = !!options.fastupdate;
-    this.reg = this.fastupdate ? keystore && /* tag? */ /* stringify */ /* stringify */ /* single param */ /* skip update: */ /* append: */ /* skip update: */ /* skip_update: */
-
-    /* skip deletion */!0 /*await rows.hasNext()*/ /*await rows.hasNext()*/ /*await rows.hasNext()*/ ? new KeystoreMap(keystore) : new Map() : keystore && !0 ? new KeystoreSet(keystore) : new Set();
+    this.reg = this.fastupdate ? keystore && /* tag? */ /* stringify */ /* stringify */ /* single param */ /* skip update: */ /* append: */ /* skip update: */
+    /* skip_update: */ /* skip deletion */!0 /*await rows.hasNext()*/ /*await rows.hasNext()*/ /*await rows.hasNext()*/ ? new KeystoreMap(keystore) : new Map() : keystore && !0 ? new KeystoreSet(keystore) : new Set();
 
     // todo support custom filter function
     this.storetree = (tmp = document.store || null) && !0 !== tmp && [];
@@ -194,9 +193,11 @@ Document.prototype.commit = async function (replace, append) {
     // queued:
     // for(const index of this.index.values()){
     //     await index.db.commit(index, replace, append);
-    // }
+
     // this.reg.clear();
-};Document.prototype.destroy = function () {
+};
+
+Document.prototype.destroy = function () {
     const promises = [];
     for (const idx of this.index.values()) {
         promises.push(idx.destroy());
diff --git a/dist/module-debug/encoder.js b/dist/module-debug/encoder.js
index 0a16586..34818c3 100644
--- a/dist/module-debug/encoder.js
+++ b/dist/module-debug/encoder.js
@@ -61,7 +61,7 @@ const whitespace = /[^\p{L}\p{N}]+/u,
 
 export default function Encoder() {
 
-    if (!this) {
+    if (this.constructor !== Encoder) {
         return new Encoder(...arguments);
     }
 
diff --git a/dist/module-debug/index.js b/dist/module-debug/index.js
index 463b396..ce377d3 100644
--- a/dist/module-debug/index.js
+++ b/dist/module-debug/index.js
@@ -29,7 +29,7 @@ import "./index/remove.js";
 
 export default function Index(options, _register) {
 
-    if (!this) {
+    if (this.constructor !== Index) {
         return new Index(options);
     }
 
diff --git a/dist/module-debug/resolver.js b/dist/module-debug/resolver.js
index 3c3890d..516f731 100644
--- a/dist/module-debug/resolver.js
+++ b/dist/module-debug/resolver.js
@@ -12,7 +12,7 @@ import "./resolve/not.js";
  */
 
 export default function Resolver(result) {
-    if (!this) {
+    if (this.constructor !== Resolver) {
         return new Resolver(result);
     }
     if (result && result.index) {
diff --git a/dist/module-debug/serialize.js b/dist/module-debug/serialize.js
index 033ab01..4883773 100644
--- a/dist/module-debug/serialize.js
+++ b/dist/module-debug/serialize.js
@@ -1,110 +1,89 @@
-// TODO return promises instead of inner await
-
 import Index from "./index.js";
 import Document from "./document.js";
 import { create_object, is_string } from "./common.js";
 
-function async(callback, self, field, key, index_doc, index, data, on_done) {
+function map_to_json(map) {
+    const json = [];
+    for (const item of map.entries()) {
+        json.push(item);
+    }
+    return json;
+}
 
-    //setTimeout(function(){
+function ctx_to_json(ctx) {
+    const json = [];
+    for (const item of ctx.entries()) {
+        json.push(map_to_json(item));
+    }
+    return json;
+}
+
+function reg_to_json(reg) {
+    const json = [];
+    for (const key of reg.keys()) {
+        json.push(key);
+    }
+    return json;
+}
+
+function save(callback, field, key, index_doc, index, data) {
 
     const res = callback(field ? field + "." + key : key, JSON.stringify(data));
 
-    // await isn't supported by ES5
-
     if (res && res.then) {
-
-        res.then(function () {
-
-            self.export(callback, self, field, index_doc, index + 1, on_done);
+        const self = this;
+        return res.then(function () {
+            return self.export(callback, field, index_doc, index + 1);
         });
-    } else {
-
-        self.export(callback, self, field, index_doc, index + 1, on_done);
     }
-    //});
+
+    return this.export(callback, field, index_doc, index + 1);
 }
 
 /**
  * @param callback
- * @param self
  * @param field
  * @param index_doc
  * @param index
- * @param on_done
  * @this {Index|Document}
  */
 
-export function exportIndex(callback, self, field, index_doc, index, on_done) {
-
-    let return_value = /* tag? */ /* stringify */ /* stringify */ /* single param */ /* skip update: */ /* append: */ /* skip update: */ /* skip_update: */ /* skip deletion */ // splice:
-    !0 /*await rows.hasNext()*/ /*await rows.hasNext()*/ /*await rows.hasNext()*/;
-    if ('undefined' == typeof on_done) {
-        return_value = new Promise(resolve => {
-            on_done = resolve;
-        });
-    }
+export function exportIndex(callback, field, index_doc, index = 0) {
 
     let key, data;
 
-    switch (index || (index = 0)) {
+    switch (index) {
 
         case 0:
 
             key = "reg";
-
-            // fastupdate isn't supported by export
-
-            if (this.fastupdate) {
-
-                data = create_object();
-
-                for (let key of this.reg.keys()) {
-
-                    data[key] = 1;
-                }
-            } else {
-
-                data = this.reg;
-            }
-
+            data = reg_to_json(this.reg);
             break;
 
         case 1:
 
             key = "cfg";
-            data = {
-                doc: 0,
-                opt: this.optimize ? 1 : 0
-            };
-
+            data = {};
             break;
 
         case 2:
 
             key = "map";
-            data = this.map;
+            data = map_to_json(this.map);
             break;
 
         case 3:
 
             key = "ctx";
-            data = this.ctx;
+            data = ctx_to_json(this.ctx);
             break;
 
         default:
 
-            if ('undefined' == typeof field && on_done) {
-
-                on_done();
-            }
-
             return;
     }
 
-    async(callback, self || this, field, key, index_doc, index, data, on_done);
-
-    return return_value;
+    return save.call(this, callback, field, key, index_doc, index, data);
 }
 
 /**
@@ -114,38 +93,32 @@ export function exportIndex(callback, self, field, index_doc, index, on_done) {
 export function importIndex(key, data) {
 
     if (!data) {
-
         return;
     }
-
     if (is_string(data)) {
-
         data = JSON.parse(data);
     }
 
     switch (key) {
 
         case "cfg":
-
-            this.optimize = !!data.opt;
             break;
 
         case "reg":
 
-            // fastupdate isn't supported by import
-
+            // fast update isn't supported by export/import
             this.fastupdate = /* suggest */ /* append: */ /* enrich */!1;
-            this.reg = data;
+            this.reg = new Set(data);
             break;
 
         case "map":
 
-            this.map = data;
+            this.map = new Map(data);
             break;
 
         case "ctx":
 
-            this.ctx = data;
+            this.ctx = new Map(data);
             break;
     }
 }
@@ -154,71 +127,63 @@ export function importIndex(key, data) {
  * @this Document
  */
 
-export function exportDocument(callback, self, field, index_doc, index, on_done) {
-
-    let return_value;
-    if ('undefined' == typeof on_done) {
-        return_value = new Promise(resolve => {
-            on_done = resolve;
-        });
-    }
-
-    index || (index = 0);
-    index_doc || (index_doc = 0);
+export function exportDocument(callback, field, index_doc = 0, index = 0) {
 
     if (index_doc < this.field.length) {
         const field = this.field[index_doc],
-              idx = this.index[field];
+              idx = this.index.get(field),
+              res = idx.export(callback, field, index_doc, index = 1);
+        // start from index 1, because document indexes does not additionally store register
 
-
-        self = this;
-
-        //setTimeout(function(){
-
-        if (!idx.export(callback, self, index ? field /*.replace(":", "-")*/ : "", index_doc, index++, on_done)) {
-
-            index_doc++;
-            index = 1;
-
-            self.export(callback, self, field, index_doc, index, on_done);
+        if (res && res.then) {
+            const self = this;
+            return res.then(function () {
+                return self.export(callback, field, index_doc + 1, index = 0);
+            });
         }
-        //});
+
+        return this.export(callback, field, index_doc + 1, index = 0);
     } else {
 
         let key, data;
 
         switch (index) {
 
+            case 0:
+
+                key = "reg";
+                data = reg_to_json(this.reg);
+                field = null;
+                break;
+
             case 1:
 
                 key = "tag";
-                data = this.tagindex;
+                data = ctx_to_json(this.tag);
                 field = null;
                 break;
 
             case 2:
 
-                key = "store";
-                data = this.store;
+                key = "doc";
+                data = map_to_json(this.store);
                 field = null;
                 break;
 
-            // case 3:
-            //
-            //     key = "reg";
-            //     data = this.register;
-            //     break;
+            case 3:
+
+                key = "cfg";
+                data = {};
+                field = null;
+                break;
 
             default:
 
-                on_done();
                 return;
         }
 
-        async(callback, this, field, key, index_doc, index, data, on_done);
+        return save.call(this, callback, field, key, index_doc, index, data);
     }
-
-    return return_value;
 }
 
 /**
@@ -228,12 +193,9 @@ export function exportDocument(callback, self, field, index_doc, index, on_done)
 export function importDocument(key, data) {
 
     if (!data) {
-
         return;
     }
-
     if (is_string(data)) {
-
         data = JSON.parse(data);
     }
 
@@ -241,28 +203,26 @@ export function importDocument(key, data) {
 
         case "tag":
 
-            this.tagindex = data;
+            this.tagindex = new Map(data);
             break;
 
         case "reg":
 
-            // fastupdate isn't supported by import
-
+            // fast update isn't supported by export/import
             this.fastupdate = !1;
-            this.reg = data;
+            this.reg = new Set(data);
 
-            for (let i = 0, index; i < this.field.length; i++) {
-
-                index = this.index[this.field[i]];
-                index.reg = data;
-                index.fastupdate = !1;
+            for (let i = 0, idx; i < this.field.length; i++) {
+                idx = this.index.get(this.field[i]);
+                idx.fastupdate = !1;
+                idx.reg = this.reg;
             }
 
             break;
 
-        case "store":
+        case "doc":
 
-            this.store = data;
+            this.store = new Map(data);
             break;
 
         default:
@@ -272,8 +232,7 @@ export function importDocument(key, data) {
             key = key[1];
 
             if (field && key) {
-
-                this.index[field].import(key, data);
+                this.index.get(field).import(key, data);
             }
     }
 }
@@ -290,7 +249,8 @@ ctx: "gulliver+travel:1,2,3|4,5,6|7,8,9;"
  * @return {string}
  */
 
-export function serialize(withFunctionWrapper = !0) {
+export function serialize(withFunctionWrapper = /* tag? */ /* stringify */ /* stringify */ /* single param */ /* skip update: */ /* append: */ /* skip update: */ /* skip_update: */ /* skip deletion */ // splice:
+!0 /*await rows.hasNext()*/ /*await rows.hasNext()*/ /*await rows.hasNext()*/) {
 
     if (!this.reg.size) return "";
 
diff --git a/dist/module-debug/worker.js b/dist/module-debug/worker.js
index 601abc1..2a23bd3 100644
--- a/dist/module-debug/worker.js
+++ b/dist/module-debug/worker.js
@@ -11,7 +11,7 @@ let pid = 0;
 
 export default function WorkerIndex(options = {}) {
 
-    if (!this) {
+    if (this.constructor !== WorkerIndex) {
         return new WorkerIndex(options);
     }
 
diff --git a/dist/module-min/document.js b/dist/module-min/document.js
index da5d100..227a2f6 100644
--- a/dist/module-min/document.js
+++ b/dist/module-min/document.js
@@ -1 +1 @@
-import{DocumentOptions,DocumentDescriptor,DocumentIndexOptions,StoreOptions}from"./type.js";import Index from"./index.js";import WorkerIndex from"./worker.js";import Cache,{searchCache}from"./cache.js";import{is_string,is_object,parse_simple}from"./common.js";import apply_async from"./async.js";import{exportDocument,importDocument}from"./serialize.js";import{KeystoreMap,KeystoreSet}from"./keystore.js";import"./document/add.js";import"./document/search.js";export default function Document(a){if(!this)return new Document(a);const b=a.document||a.doc||a;let c,d;if(this.tree=[],this.field=[],this.marker=[],this.key=(c=b.key||b.id)&&parse_tree(c,this.marker)||"id",d=a.keystore||0,d&&(this.keystore=d),this.fastupdate=!!a.fastupdate,this.reg=this.fastupdate?d&&!0?new KeystoreMap(d):new Map:d&&!0?new KeystoreSet(d):new Set,this.storetree=(c=b.store||null)&&!0!==c&&[],this.store=c&&(d&&!0?new KeystoreMap(d):new Map),this.cache=(c=a.cache||null)&&new Cache(c),a.cache=!1,this.worker=a.worker,this.index=parse_descriptor.call(this,a,b),(this.tag=null,(c=b.tag)&&("string"==typeof c&&(c=[c]),c.length))){this.tag=new Map,this.tagtree=[],this.tagfield=[];for(let a,b,d=0;d<c.length;d++){if(a=c[d],b=a.field||a,!b)throw new Error("The tag field from the document descriptor is undefined.");a.custom?this.tagtree[d]=a.custom:(this.tagtree[d]=parse_tree(b,this.marker),a.filter&&("string"==typeof this.tagtree[d]&&(this.tagtree[d]=new String(this.tagtree[d])),this.tagtree[d]._filter=a.filter)),this.tagfield[d]=b,this.tag.set(b,new Map)}}if(this.worker){const a=[];for(const b of this.index.values())b.then&&a.push(b);if(a.length){const b=this;return Promise.all(a).then(function(a){let c=0;for(const d of b.index.entries()){const e=d[0],f=d[1];f.then&&b.index.set(e,a[c++])}return b})}}else a.db&&this.mount(a.db)}Document.prototype.mount=function(a){let b=this.field;if(this.tag)for(let a,c=0;c<this.tagfield.length;c++){a=this.tagfield[c];let d;this.index.set(a,d=new Index({},this.reg)),b===this.field&&(b=b.slice(0)),b.push(a),d.tag=this.tag.get(a)}const c=[],d={db:a.db,type:a.type,fastupdate:a.fastupdate};for(let e,f,g=0;g<b.length;g++){d.field=f=b[g],e=this.index.get(f);const h=new a.constructor(a.id,d);h.id=a.id,c[g]=h.mount(e),e.document=!0,g?e.bypass=!0:e.store=this.store}return this.db=!0,Promise.all(c)},Document.prototype.commit=async function(a,b){const c=[];for(const d of this.index.values())c.push(d.db.commit(d,a,b));await Promise.all(c),this.reg.clear()},Document.prototype.destroy=function(){const a=[];for(const b of this.index.values())a.push(b.destroy());return Promise.all(a)};function parse_descriptor(a,b){const c=new Map;let d=b.index||b.field||b;is_string(d)&&(d=[d]);for(let e,f,g=0;g<d.length;g++){if(e=d[g],is_string(e)||(f=e,e=e.field),f=is_object(f)?Object.assign({},a,f):a,this.worker){const a=new WorkerIndex(f);a?c.set(e,a):this.worker=!1}this.worker||c.set(e,new Index(f,this.reg)),f.custom?this.tree[g]=f.custom:(this.tree[g]=parse_tree(e,this.marker),f.filter&&("string"==typeof this.tree[g]&&(this.tree[g]=new String(this.tree[g])),this.tree[g]._filter=f.filter)),this.field[g]=e}if(this.storetree){let a=b.store;is_string(a)&&(a=[a]);for(let b,c,d=0;d<a.length;d++)b=a[d],c=b.field||b,b.custom?(this.storetree[d]=b.custom,b.custom._field=c):(this.storetree[d]=parse_tree(c,this.marker),b.filter&&("string"==typeof this.storetree[d]&&(this.storetree[d]=new String(this.storetree[d])),this.storetree[d]._filter=b.filter))}return c}function parse_tree(a,b){const c=a.split(":");let d=0;for(let e=0;e<c.length;e++)a=c[e],"]"===a[a.length-1]&&(a=a.substring(0,a.length-2),a&&(b[d]=!0)),a&&(c[d++]=a);return d<c.length&&(c.length=d),1<d?c:c[0]}Document.prototype.append=function(a,b){return this.add(a,b,!0)},Document.prototype.update=function(a,b){return this.remove(a).add(a,b)},Document.prototype.remove=function(a){is_object(a)&&(a=parse_simple(a,this.key));for(const b of this.index.values())b.remove(a,!0);if(this.reg.has(a)){if(this.tag&&!this.fastupdate)for(let b of this.tag.values())for(let c of b){const d=c[0],e=c[1],f=e.indexOf(a);-1<f&&(1<e.length?e.splice(f,1):b.delete(d))}this.store&&this.store.delete(a),this.reg.delete(a)}return this.cache&&this.cache.remove(a),this},Document.prototype.clear=function(){for(const a of this.index.values())a.clear();if(this.tag)for(const a of this.tag.values())a.clear();return this.store&&this.store.clear(),this},Document.prototype.contain=function(a){return this.db?this.index.get(this.field[0]).db.has(a):this.reg.has(a)},Document.prototype.cleanup=function(){for(const a of this.index.values())a.cleanup();return this},Document.prototype.get=function(a){return this.db?this.index.get(this.field[0]).db.enrich(a).then(function(a){return a[0]&&a[0].doc}):this.store.get(a)},Document.prototype.set=function(a,b){return this.store.set(a,b),this},Document.prototype.searchCache=searchCache,Document.prototype.export=exportDocument,Document.prototype.import=importDocument,apply_async(Document.prototype);
\ No newline at end of file
+import{DocumentOptions,DocumentDescriptor,DocumentIndexOptions,StoreOptions}from"./type.js";import Index from"./index.js";import WorkerIndex from"./worker.js";import Cache,{searchCache}from"./cache.js";import{is_string,is_object,parse_simple}from"./common.js";import apply_async from"./async.js";import{exportDocument,importDocument}from"./serialize.js";import{KeystoreMap,KeystoreSet}from"./keystore.js";import"./document/add.js";import"./document/search.js";export default function Document(a){if(this.constructor!==Document)return new Document(a);const b=a.document||a.doc||a;let c,d;if(this.tree=[],this.field=[],this.marker=[],this.key=(c=b.key||b.id)&&parse_tree(c,this.marker)||"id",d=a.keystore||0,d&&(this.keystore=d),this.fastupdate=!!a.fastupdate,this.reg=this.fastupdate?d&&!0?new KeystoreMap(d):new Map:d&&!0?new KeystoreSet(d):new Set,this.storetree=(c=b.store||null)&&!0!==c&&[],this.store=c&&(d&&!0?new KeystoreMap(d):new Map),this.cache=(c=a.cache||null)&&new Cache(c),a.cache=!1,this.worker=a.worker,this.index=parse_descriptor.call(this,a,b),(this.tag=null,(c=b.tag)&&("string"==typeof c&&(c=[c]),c.length))){this.tag=new Map,this.tagtree=[],this.tagfield=[];for(let a,b,d=0;d<c.length;d++){if(a=c[d],b=a.field||a,!b)throw new Error("The tag field from the document descriptor is undefined.");a.custom?this.tagtree[d]=a.custom:(this.tagtree[d]=parse_tree(b,this.marker),a.filter&&("string"==typeof this.tagtree[d]&&(this.tagtree[d]=new String(this.tagtree[d])),this.tagtree[d]._filter=a.filter)),this.tagfield[d]=b,this.tag.set(b,new Map)}}if(this.worker){const a=[];for(const b of this.index.values())b.then&&a.push(b);if(a.length){const b=this;return Promise.all(a).then(function(a){let c=0;for(const d of b.index.entries()){const e=d[0],f=d[1];f.then&&b.index.set(e,a[c++])}return b})}}else a.db&&this.mount(a.db)}Document.prototype.mount=function(a){let b=this.field;if(this.tag)for(let a,c=0;c<this.tagfield.length;c++){a=this.tagfield[c];let d;this.index.set(a,d=new Index({},this.reg)),b===this.field&&(b=b.slice(0)),b.push(a),d.tag=this.tag.get(a)}const c=[],d={db:a.db,type:a.type,fastupdate:a.fastupdate};for(let e,f,g=0;g<b.length;g++){d.field=f=b[g],e=this.index.get(f);const h=new a.constructor(a.id,d);h.id=a.id,c[g]=h.mount(e),e.document=!0,g?e.bypass=!0:e.store=this.store}return this.db=!0,Promise.all(c)},Document.prototype.commit=async function(a,b){const c=[];for(const d of this.index.values())c.push(d.db.commit(d,a,b));await Promise.all(c),this.reg.clear()},Document.prototype.destroy=function(){const a=[];for(const b of this.index.values())a.push(b.destroy());return Promise.all(a)};function parse_descriptor(a,b){const c=new Map;let d=b.index||b.field||b;is_string(d)&&(d=[d]);for(let e,f,g=0;g<d.length;g++){if(e=d[g],is_string(e)||(f=e,e=e.field),f=is_object(f)?Object.assign({},a,f):a,this.worker){const a=new WorkerIndex(f);a?c.set(e,a):this.worker=!1}this.worker||c.set(e,new Index(f,this.reg)),f.custom?this.tree[g]=f.custom:(this.tree[g]=parse_tree(e,this.marker),f.filter&&("string"==typeof this.tree[g]&&(this.tree[g]=new String(this.tree[g])),this.tree[g]._filter=f.filter)),this.field[g]=e}if(this.storetree){let a=b.store;is_string(a)&&(a=[a]);for(let b,c,d=0;d<a.length;d++)b=a[d],c=b.field||b,b.custom?(this.storetree[d]=b.custom,b.custom._field=c):(this.storetree[d]=parse_tree(c,this.marker),b.filter&&("string"==typeof this.storetree[d]&&(this.storetree[d]=new String(this.storetree[d])),this.storetree[d]._filter=b.filter))}return c}function parse_tree(a,b){const c=a.split(":");let d=0;for(let e=0;e<c.length;e++)a=c[e],"]"===a[a.length-1]&&(a=a.substring(0,a.length-2),a&&(b[d]=!0)),a&&(c[d++]=a);return d<c.length&&(c.length=d),1<d?c:c[0]}Document.prototype.append=function(a,b){return this.add(a,b,!0)},Document.prototype.update=function(a,b){return this.remove(a).add(a,b)},Document.prototype.remove=function(a){is_object(a)&&(a=parse_simple(a,this.key));for(const b of this.index.values())b.remove(a,!0);if(this.reg.has(a)){if(this.tag&&!this.fastupdate)for(let b of this.tag.values())for(let c of b){const d=c[0],e=c[1],f=e.indexOf(a);-1<f&&(1<e.length?e.splice(f,1):b.delete(d))}this.store&&this.store.delete(a),this.reg.delete(a)}return this.cache&&this.cache.remove(a),this},Document.prototype.clear=function(){for(const a of this.index.values())a.clear();if(this.tag)for(const a of this.tag.values())a.clear();return this.store&&this.store.clear(),this},Document.prototype.contain=function(a){return this.db?this.index.get(this.field[0]).db.has(a):this.reg.has(a)},Document.prototype.cleanup=function(){for(const a of this.index.values())a.cleanup();return this},Document.prototype.get=function(a){return this.db?this.index.get(this.field[0]).db.enrich(a).then(function(a){return a[0]&&a[0].doc}):this.store.get(a)},Document.prototype.set=function(a,b){return this.store.set(a,b),this},Document.prototype.searchCache=searchCache,Document.prototype.export=exportDocument,Document.prototype.import=importDocument,apply_async(Document.prototype);
\ No newline at end of file
diff --git a/dist/module-min/encoder.js b/dist/module-min/encoder.js
index c7d4c8b..68dffd0 100644
--- a/dist/module-min/encoder.js
+++ b/dist/module-min/encoder.js
@@ -1 +1 @@
-import{parse_option}from"./common.js";import normalize_polyfill from"./charset/normalize.js";import{EncoderOptions}from"./type.js";const whitespace=/[^\p{L}\p{N}]+/u,numeric_split_length=/(\d{3})/g,numeric_split_prev_char=/(\D)(\d{3})/g,numeric_split_next_char=/(\d{3})(\D)/g,normalize=/[\u0300-\u036f]/g;export default function Encoder(){if(!this)return new Encoder(...arguments);for(let a=0;a<arguments.length;a++)this.assign(arguments[a])}Encoder.prototype.assign=function(a){this.normalize=parse_option(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}"),(c=c.char)&&(e+="object"==typeof c?c.join(""):c);try{this.split=new RegExp("["+(b?"^":"")+e+"]+","u")}catch(a){this.split=/\s+/}this.numeric=d}else{try{this.split=parse_option(c,whitespace,this.split)}catch(a){this.split=/\s+/}this.numeric=parse_option(this.numeric,!0)}if(this.prepare=parse_option(a.prepare,null,this.prepare),this.finalize=parse_option(a.finalize,null,this.finalize),!normalize&&(this.mapper=new Map(normalize_polyfill)),this.rtl=a.rtl||!1,this.dedupe=parse_option(a.dedupe,!0,this.dedupe),this.filter=parse_option((c=a.filter)&&new Set(c),null,this.filter),this.matcher=parse_option((c=a.matcher)&&new Map(c),null,this.matcher),this.mapper=parse_option((c=a.mapper)&&new Map(c),null,this.mapper),this.stemmer=parse_option((c=a.stemmer)&&new Map(c),null,this.stemmer),this.replacer=parse_option(a.replacer,null,this.replacer),this.minlength=parse_option(a.minlength,1,this.minlength),this.maxlength=parse_option(a.maxlength,0,this.maxlength),this.cache=c=parse_option(a.cache,!0,this.cache),c&&(this.timer=null,this.cache_size="number"==typeof c?c:2e5,this.cache_enc=new Map,this.cache_term=new Map,this.cache_enc_length=128,this.cache_term_length=128),this.matcher_str="",this.matcher_test=null,this.stemmer_str="",this.stemmer_test=null,this.matcher)for(const a of this.matcher.keys())this.matcher_str+=(this.matcher_str?"|":"")+a;if(this.stemmer)for(const a of this.stemmer.keys())this.stemmer_str+=(this.stemmer_str?"|":"")+a;return this},Encoder.prototype.addMatcher=function(a,b){return"object"==typeof a?this.addReplacer(a,b):2>a.length?this.addMapper(a,b):(this.matcher||(this.matcher=new Map),this.matcher.set(a,b),this.matcher_str+=(this.matcher_str?"|":"")+a,this.matcher_test=null,this.cache&&this.invalidate(),this)},Encoder.prototype.addStemmer=function(a,b){return this.stemmer||(this.stemmer=new Map),this.stemmer.set(a,b),this.stemmer_str+=(this.stemmer_str?"|":"")+a,this.stemmer_test=null,this.cache&&this.invalidate(),this},Encoder.prototype.addFilter=function(a){return this.filter||(this.filter=new Set),this.filter.add(a),this.cache&&this.invalidate(),this},Encoder.prototype.addMapper=function(a,b){return"object"==typeof a?this.addReplacer(a,b):1<a.length?this.addMatcher(a,b):(this.mapper||(this.mapper=new Map),this.mapper.set(a,b),this.cache&&this.invalidate(),this)},Encoder.prototype.addReplacer=function(a,b){return"string"==typeof a&&(a=new RegExp(a,"g")),this.replacer||(this.replacer=[]),this.replacer.push(a,b||""),this.cache&&this.invalidate(),this},Encoder.prototype.invalidate=function(){this.cache_enc.clear(),this.cache_term.clear()},Encoder.prototype.encode=function(a){if(this.cache&&a.length<=this.cache_enc_length)if(!this.timer)this.timer=setTimeout(clear,50,this);else if(this.cache_enc.has(a))return this.cache_enc.get(a);this.normalize&&("function"==typeof this.normalize?a=this.normalize(a):normalize?a=a.normalize("NFKD").replace(normalize,"").toLowerCase():a=a.toLowerCase()),this.prepare&&(a=this.prepare(a)),this.numeric&&3<a.length&&(a=a.replace(numeric_split_prev_char,"$1 $2").replace(numeric_split_next_char,"$1 $2").replace(numeric_split_length,"$1 "));const b=!(this.dedupe||this.mapper||this.filter||this.matcher||this.stemmer||this.replacer);let c=[],d=this.split||""===this.split?a.split(this.split):a;for(let e,f,g=0;g<d.length;g++){if(!(e=f=d[g]))continue;if(e.length<this.minlength)continue;if(b){c.push(e);continue}if(this.filter&&this.filter.has(e))continue;if(this.cache&&e.length<=this.cache_term_length)if(this.timer){const a=this.cache_term.get(e);if(a||""===a){a&&c.push(a);continue}}else this.timer=setTimeout(clear,50,this);let a;if(this.stemmer&&2<e.length&&(this.stemmer_test||(this.stemmer_test=new RegExp("(?!^)("+this.stemmer_str+")$")),e=e.replace(this.stemmer_test,a=>this.stemmer.get(a)),a=1),e&&a&&(e.length<this.minlength||this.filter&&this.filter.has(e))&&(e=""),e&&(this.mapper||this.dedupe&&1<e.length)){let a="";for(let b,c,d=0,f="";d<e.length;d++)b=e.charAt(d),b===f&&this.dedupe||(c=this.mapper&&this.mapper.get(b),c||""===c?(c!==f||!this.dedupe)&&(f=c)&&(a+=c):a+=f=b);e=a}if(this.matcher&&1<e.length&&(this.matcher_test||(this.matcher_test=new RegExp("("+this.matcher_str+")","g")),e=e.replace(this.matcher_test,a=>this.matcher.get(a))),e&&this.replacer)for(let a=0;e&&a<this.replacer.length;a+=2)e=e.replace(this.replacer[a],this.replacer[a+1]);this.cache&&f.length<=this.cache_term_length&&(this.cache_term.set(f,e),this.cache_term.size>this.cache_size&&(this.cache_term.clear(),this.cache_term_length=0|this.cache_term_length/1.1)),e&&c.push(e)}return this.finalize&&(c=this.finalize(c)||c),this.cache&&a.length<=this.cache_enc_length&&(this.cache_enc.set(a,c),this.cache_enc.size>this.cache_size&&(this.cache_enc.clear(),this.cache_enc_length=0|this.cache_enc_length/1.1)),c};function clear(a){a.timer=null,a.cache_enc.clear(),a.cache_term.clear()}
\ No newline at end of file
+import{parse_option}from"./common.js";import normalize_polyfill from"./charset/normalize.js";import{EncoderOptions}from"./type.js";const whitespace=/[^\p{L}\p{N}]+/u,numeric_split_length=/(\d{3})/g,numeric_split_prev_char=/(\D)(\d{3})/g,numeric_split_next_char=/(\d{3})(\D)/g,normalize=/[\u0300-\u036f]/g;export default function Encoder(){if(this.constructor!==Encoder)return new Encoder(...arguments);for(let a=0;a<arguments.length;a++)this.assign(arguments[a])}Encoder.prototype.assign=function(a){this.normalize=parse_option(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}"),(c=c.char)&&(e+="object"==typeof c?c.join(""):c);try{this.split=new RegExp("["+(b?"^":"")+e+"]+","u")}catch(a){this.split=/\s+/}this.numeric=d}else{try{this.split=parse_option(c,whitespace,this.split)}catch(a){this.split=/\s+/}this.numeric=parse_option(this.numeric,!0)}if(this.prepare=parse_option(a.prepare,null,this.prepare),this.finalize=parse_option(a.finalize,null,this.finalize),!normalize&&(this.mapper=new Map(normalize_polyfill)),this.rtl=a.rtl||!1,this.dedupe=parse_option(a.dedupe,!0,this.dedupe),this.filter=parse_option((c=a.filter)&&new Set(c),null,this.filter),this.matcher=parse_option((c=a.matcher)&&new Map(c),null,this.matcher),this.mapper=parse_option((c=a.mapper)&&new Map(c),null,this.mapper),this.stemmer=parse_option((c=a.stemmer)&&new Map(c),null,this.stemmer),this.replacer=parse_option(a.replacer,null,this.replacer),this.minlength=parse_option(a.minlength,1,this.minlength),this.maxlength=parse_option(a.maxlength,0,this.maxlength),this.cache=c=parse_option(a.cache,!0,this.cache),c&&(this.timer=null,this.cache_size="number"==typeof c?c:2e5,this.cache_enc=new Map,this.cache_term=new Map,this.cache_enc_length=128,this.cache_term_length=128),this.matcher_str="",this.matcher_test=null,this.stemmer_str="",this.stemmer_test=null,this.matcher)for(const a of this.matcher.keys())this.matcher_str+=(this.matcher_str?"|":"")+a;if(this.stemmer)for(const a of this.stemmer.keys())this.stemmer_str+=(this.stemmer_str?"|":"")+a;return this},Encoder.prototype.addMatcher=function(a,b){return"object"==typeof a?this.addReplacer(a,b):2>a.length?this.addMapper(a,b):(this.matcher||(this.matcher=new Map),this.matcher.set(a,b),this.matcher_str+=(this.matcher_str?"|":"")+a,this.matcher_test=null,this.cache&&this.invalidate(),this)},Encoder.prototype.addStemmer=function(a,b){return this.stemmer||(this.stemmer=new Map),this.stemmer.set(a,b),this.stemmer_str+=(this.stemmer_str?"|":"")+a,this.stemmer_test=null,this.cache&&this.invalidate(),this},Encoder.prototype.addFilter=function(a){return this.filter||(this.filter=new Set),this.filter.add(a),this.cache&&this.invalidate(),this},Encoder.prototype.addMapper=function(a,b){return"object"==typeof a?this.addReplacer(a,b):1<a.length?this.addMatcher(a,b):(this.mapper||(this.mapper=new Map),this.mapper.set(a,b),this.cache&&this.invalidate(),this)},Encoder.prototype.addReplacer=function(a,b){return"string"==typeof a&&(a=new RegExp(a,"g")),this.replacer||(this.replacer=[]),this.replacer.push(a,b||""),this.cache&&this.invalidate(),this},Encoder.prototype.invalidate=function(){this.cache_enc.clear(),this.cache_term.clear()},Encoder.prototype.encode=function(a){if(this.cache&&a.length<=this.cache_enc_length)if(!this.timer)this.timer=setTimeout(clear,50,this);else if(this.cache_enc.has(a))return this.cache_enc.get(a);this.normalize&&("function"==typeof this.normalize?a=this.normalize(a):normalize?a=a.normalize("NFKD").replace(normalize,"").toLowerCase():a=a.toLowerCase()),this.prepare&&(a=this.prepare(a)),this.numeric&&3<a.length&&(a=a.replace(numeric_split_prev_char,"$1 $2").replace(numeric_split_next_char,"$1 $2").replace(numeric_split_length,"$1 "));const b=!(this.dedupe||this.mapper||this.filter||this.matcher||this.stemmer||this.replacer);let c=[],d=this.split||""===this.split?a.split(this.split):a;for(let e,f,g=0;g<d.length;g++){if(!(e=f=d[g]))continue;if(e.length<this.minlength)continue;if(b){c.push(e);continue}if(this.filter&&this.filter.has(e))continue;if(this.cache&&e.length<=this.cache_term_length)if(this.timer){const a=this.cache_term.get(e);if(a||""===a){a&&c.push(a);continue}}else this.timer=setTimeout(clear,50,this);let a;if(this.stemmer&&2<e.length&&(this.stemmer_test||(this.stemmer_test=new RegExp("(?!^)("+this.stemmer_str+")$")),e=e.replace(this.stemmer_test,a=>this.stemmer.get(a)),a=1),e&&a&&(e.length<this.minlength||this.filter&&this.filter.has(e))&&(e=""),e&&(this.mapper||this.dedupe&&1<e.length)){let a="";for(let b,c,d=0,f="";d<e.length;d++)b=e.charAt(d),b===f&&this.dedupe||(c=this.mapper&&this.mapper.get(b),c||""===c?(c!==f||!this.dedupe)&&(f=c)&&(a+=c):a+=f=b);e=a}if(this.matcher&&1<e.length&&(this.matcher_test||(this.matcher_test=new RegExp("("+this.matcher_str+")","g")),e=e.replace(this.matcher_test,a=>this.matcher.get(a))),e&&this.replacer)for(let a=0;e&&a<this.replacer.length;a+=2)e=e.replace(this.replacer[a],this.replacer[a+1]);this.cache&&f.length<=this.cache_term_length&&(this.cache_term.set(f,e),this.cache_term.size>this.cache_size&&(this.cache_term.clear(),this.cache_term_length=0|this.cache_term_length/1.1)),e&&c.push(e)}return this.finalize&&(c=this.finalize(c)||c),this.cache&&a.length<=this.cache_enc_length&&(this.cache_enc.set(a,c),this.cache_enc.size>this.cache_size&&(this.cache_enc.clear(),this.cache_enc_length=0|this.cache_enc_length/1.1)),c};function clear(a){a.timer=null,a.cache_enc.clear(),a.cache_term.clear()}
\ No newline at end of file
diff --git a/dist/module-min/index.js b/dist/module-min/index.js
index 9266d3e..06cc57c 100644
--- a/dist/module-min/index.js
+++ b/dist/module-min/index.js
@@ -1 +1 @@
-import{IndexOptions,ContextOptions}from"./type.js";import Encoder from"./encoder.js";import Cache,{searchCache}from"./cache.js";import Charset from"./charset.js";import{KeystoreMap,KeystoreSet}from"./keystore.js";import{is_array,is_string}from"./common.js";import{exportIndex,importIndex,serialize}from"./serialize.js";import default_encoder from"./charset/latin/default.js";import apply_preset from"./preset.js";import apply_async from"./async.js";import tick from"./profiler.js";import"./index/add.js";import"./index/search.js";import"./index/remove.js";export default function Index(a,b){if(!this)return new Index(a);!1,a=a?apply_preset(a):{};const c=a.context||{},d=is_string(a.encoder)?Charset[a.encoder]:a.encode||a.encoder||default_encoder;this.encoder=d.encode?d:"object"==typeof d?new Encoder(d):{encode:d},this.compress=a.compress||a.compression||!1;let e;this.resolution=a.resolution||9,this.tokenize=e=a.tokenize||"strict",this.depth="strict"===e&&c.depth||0,this.bidirectional=!1!==c.bidirectional,this.fastupdate=!!a.fastupdate,this.score=a.score||null,e=a.keystore||0,e&&(this.keystore=e),this.map=e&&!0?new KeystoreMap(e):new Map,this.ctx=e&&!0?new KeystoreMap(e):new Map,this.reg=b||(this.fastupdate?e&&!0?new KeystoreMap(e):new Map:e&&!0?new KeystoreSet(e):new Set),this.resolution_ctx=c.resolution||1,this.rtl=d.rtl||a.rtl||!1,this.cache=(e=a.cache||null)&&new Cache(e),this.resolve=!1!==a.resolve,(e=a.db)&&(this.db=this.mount(e)),this.commit_auto=!1!==a.commit,this.commit_task=[],this.commit_timer=null}Index.prototype.mount=function(a){return this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null),a.mount(this)},Index.prototype.commit=function(a,b){return this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null),this.db.commit(this,a,b)},Index.prototype.destroy=function(){return this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null),this.db.destroy()};export function autoCommit(a,b,c){a.commit_timer||(a.commit_timer=setTimeout(function(){a.commit_timer=null,a.db.commit(a,b,c)},0))}Index.prototype.clear=function(){return this.map.clear(),this.ctx.clear(),this.reg.clear(),this.cache&&this.cache.clear(),this.db&&(this.commit_timer&&clearTimeout(this.commit_timer),this.commit_timer=null,this.commit_task=[{clear:!0}]),this},Index.prototype.append=function(a,b){return this.add(a,b,!0)},Index.prototype.contain=function(a){return this.db?this.db.has(a):this.reg.has(a)},Index.prototype.update=function(a,b){const c=this,d=this.remove(a);return d&&d.then?d.then(()=>c.add(a,b)):this.add(a,b)};function cleanup_index(a){let b=0;if(is_array(a))for(let c,d=0;d<a.length;d++)(c=a[d])&&(b+=c.length);else for(const c of a){const d=c[0],e=c[1],f=cleanup_index(e);f?b+=f:a.delete(d)}return b}Index.prototype.cleanup=function(){return this.fastupdate?(cleanup_index(this.map),this.depth&&cleanup_index(this.ctx),this):(!1,this)},Index.prototype.searchCache=searchCache,Index.prototype.export=exportIndex,Index.prototype.import=importIndex,Index.prototype.serialize=serialize,apply_async(Index.prototype);
\ No newline at end of file
+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.constructor!==Index)return new Index(a);!1,a=a?apply_preset(a):{};const c=a.context||{},d=is_string(a.encoder)?Charset[a.encoder]:a.encode||a.encoder||default_encoder;this.encoder=d.encode?d:"object"==typeof d?new Encoder(d):{encode:d},this.compress=a.compress||a.compression||!1;let e;this.resolution=a.resolution||9,this.tokenize=e=a.tokenize||"strict",this.depth="strict"===e&&c.depth||0,this.bidirectional=!1!==c.bidirectional,this.fastupdate=!!a.fastupdate,this.score=a.score||null,e=a.keystore||0,e&&(this.keystore=e),this.map=e&&!0?new KeystoreMap(e):new Map,this.ctx=e&&!0?new KeystoreMap(e):new Map,this.reg=b||(this.fastupdate?e&&!0?new KeystoreMap(e):new Map:e&&!0?new KeystoreSet(e):new Set),this.resolution_ctx=c.resolution||1,this.rtl=d.rtl||a.rtl||!1,this.cache=(e=a.cache||null)&&new Cache(e),this.resolve=!1!==a.resolve,(e=a.db)&&(this.db=this.mount(e)),this.commit_auto=!1!==a.commit,this.commit_task=[],this.commit_timer=null}Index.prototype.mount=function(a){return this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null),a.mount(this)},Index.prototype.commit=function(a,b){return this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null),this.db.commit(this,a,b)},Index.prototype.destroy=function(){return this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null),this.db.destroy()};export function autoCommit(a,b,c){a.commit_timer||(a.commit_timer=setTimeout(function(){a.commit_timer=null,a.db.commit(a,b,c)},0))}Index.prototype.clear=function(){return this.map.clear(),this.ctx.clear(),this.reg.clear(),this.cache&&this.cache.clear(),this.db&&(this.commit_timer&&clearTimeout(this.commit_timer),this.commit_timer=null,this.commit_task=[{clear:!0}]),this},Index.prototype.append=function(a,b){return this.add(a,b,!0)},Index.prototype.contain=function(a){return this.db?this.db.has(a):this.reg.has(a)},Index.prototype.update=function(a,b){const c=this,d=this.remove(a);return d&&d.then?d.then(()=>c.add(a,b)):this.add(a,b)};function cleanup_index(a){let b=0;if(is_array(a))for(let c,d=0;d<a.length;d++)(c=a[d])&&(b+=c.length);else for(const c of a){const d=c[0],e=c[1],f=cleanup_index(e);f?b+=f:a.delete(d)}return b}Index.prototype.cleanup=function(){return this.fastupdate?(cleanup_index(this.map),this.depth&&cleanup_index(this.ctx),this):(!1,this)},Index.prototype.searchCache=searchCache,Index.prototype.export=exportIndex,Index.prototype.import=importIndex,Index.prototype.serialize=serialize,apply_async(Index.prototype);
\ No newline at end of file
diff --git a/dist/module-min/resolver.js b/dist/module-min/resolver.js
index dab39aa..f7ad81f 100644
--- a/dist/module-min/resolver.js
+++ b/dist/module-min/resolver.js
@@ -1 +1 @@
-import default_resolver from"./resolve/default.js";import{set_resolve}from"./index/search.js";import{ResolverOptions}from"./type.js";import"./resolve/or.js";import"./resolve/and.js";import"./resolve/xor.js";import"./resolve/not.js";export default function Resolver(a){return this?a&&a.index?(a.resolve=!1,this.index=a.index,this.boostval=a.boost||0,this.result=a.index.search(a).result,this):a.constructor===Resolver?a:void(this.index=null,this.result=a||[],this.boostval=0):new Resolver(a)}Resolver.prototype.limit=function(a){if(this.result.length){const b=[];let c=0;for(let d,e=0;e<this.result.length;e++)if(d=this.result[e],d.length+c<a)b[e]=d,c+=d.length;else{b[e]=d.slice(0,a-c),this.result=b;break}}return this},Resolver.prototype.offset=function(a){if(this.result.length){const b=[];let c=0;for(let d,e=0;e<this.result.length;e++)d=this.result[e],d.length+c<a?c+=d.length:(b[e]=d.slice(a-c),c=a);this.result=b}return this},Resolver.prototype.boost=function(a){return this.boostval+=a,this},Resolver.prototype.resolve=function(a,b,c){set_resolve(1);const d=this.result;return this.index=null,this.result=null,d.length?("object"==typeof a&&(c=a.enrich,b=a.offset,a=a.limit),default_resolver(d,a||100,b,c)):d};
\ No newline at end of file
+import default_resolver from"./resolve/default.js";import{set_resolve}from"./index/search.js";import{ResolverOptions}from"./type.js";import"./resolve/or.js";import"./resolve/and.js";import"./resolve/xor.js";import"./resolve/not.js";export default function Resolver(a){return this.constructor===Resolver?a&&a.index?(a.resolve=!1,this.index=a.index,this.boostval=a.boost||0,this.result=a.index.search(a).result,this):a.constructor===Resolver?a:void(this.index=null,this.result=a||[],this.boostval=0):new Resolver(a)}Resolver.prototype.limit=function(a){if(this.result.length){const b=[];let c=0;for(let d,e=0;e<this.result.length;e++)if(d=this.result[e],d.length+c<a)b[e]=d,c+=d.length;else{b[e]=d.slice(0,a-c),this.result=b;break}}return this},Resolver.prototype.offset=function(a){if(this.result.length){const b=[];let c=0;for(let d,e=0;e<this.result.length;e++)d=this.result[e],d.length+c<a?c+=d.length:(b[e]=d.slice(a-c),c=a);this.result=b}return this},Resolver.prototype.boost=function(a){return this.boostval+=a,this},Resolver.prototype.resolve=function(a,b,c){set_resolve(1);const d=this.result;return this.index=null,this.result=null,d.length?("object"==typeof a&&(c=a.enrich,b=a.offset,a=a.limit),default_resolver(d,a||100,b,c)):d};
\ No newline at end of file
diff --git a/dist/module-min/serialize.js b/dist/module-min/serialize.js
index 0bdddbe..2bf1ccd 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);}}export function serialize(a=!0){if(!this.reg.size)return"";let b="",c="";for(const d of this.reg.keys())c||(c=typeof d),b+=(b?",":"")+("string"==c?"\""+d+"\"":d);b="index.reg=new Set(["+b+"]);";let d="";for(const b of this.map.entries()){const a=b[0],e=b[1];let f="";for(let a,b=0;b<e.length;b++){a=e[b]||[""];let d="";for(let b=0;b<a.length;b++)d+=(d?",":"")+("string"==c?"\""+a[b]+"\"":a[b]);d="["+d+"]",f+=(f?",":"")+d}f="[\""+a+"\",["+f+"]]",d+=(d?",":"")+f}d="index.map=new Map(["+d+"]);";let e="";for(const b of this.ctx.entries()){const a=b[0],d=b[1];for(const b of d.entries()){const d=b[0],f=b[1];let g="";for(let a,b=0;b<f.length;b++){a=f[b]||[""];let d="";for(let b=0;b<a.length;b++)d+=(d?",":"")+("string"==c?"\""+a[b]+"\"":a[b]);d="["+d+"]",g+=(g?",":"")+d}g="new Map([[\""+d+"\",["+g+"]]])",g="[\""+a+"\","+g+"]",e+=(e?",":"")+g}}return e="index.ctx=new Map(["+e+"]);",a?"function inject(index){"+b+d+e+"}":b+d+e}
\ No newline at end of file
+import Index from"./index.js";import Document from"./document.js";import{create_object,is_string}from"./common.js";function map_to_json(a){const b=[];for(const c of a.entries())b.push(c);return b}function ctx_to_json(a){const b=[];for(const c of a.entries())b.push(map_to_json(c));return b}function reg_to_json(a){const b=[];for(const c of a.keys())b.push(c);return b}function save(a,b,c,d,e,f){const g=a(b?b+"."+c:c,JSON.stringify(f));if(g&&g.then){const c=this;return g.then(function(){return c.export(a,b,d,e+1)})}return this.export(a,b,d,e+1)}export function exportIndex(a,b,c,d=0){let e,f;switch(d){case 0:e="reg",f=reg_to_json(this.reg);break;case 1:e="cfg",f={};break;case 2:e="map",f=map_to_json(this.map);break;case 3:e="ctx",f=ctx_to_json(this.ctx);break;default:return;}return save.call(this,a,b,e,c,d,f)}export function importIndex(a,b){if(b)switch(is_string(b)&&(b=JSON.parse(b)),a){case"cfg":break;case"reg":this.fastupdate=!1,this.reg=new Set(b);break;case"map":this.map=new Map(b);break;case"ctx":this.ctx=new Map(b);}}export function exportDocument(a,b,c=0,d=0){if(c<this.field.length){const b=this.field[c],e=this.index.get(b),f=e.export(a,b,c,d=1);if(f&&f.then){const e=this;return f.then(function(){return e.export(a,b,c+1,d=0)})}return this.export(a,b,c+1,d=0)}else{let e,f;switch(d){case 0:e="reg",f=reg_to_json(this.reg),b=null;break;case 1:e="tag",f=ctx_to_json(this.tag),b=null;break;case 2:e="doc",f=map_to_json(this.store),b=null;break;case 3:e="cfg",f={},b=null;break;default:return;}return save.call(this,a,b,e,c,d,f)}}export function importDocument(a,b){if(b)switch(is_string(b)&&(b=JSON.parse(b)),a){case"tag":this.tagindex=new Map(b);break;case"reg":this.fastupdate=!1,this.reg=new Set(b);for(let a,b=0;b<this.field.length;b++)a=this.index.get(this.field[b]),a.fastupdate=!1,a.reg=this.reg;break;case"doc":this.store=new Map(b);break;default:a=a.split(".");const c=a[0];a=a[1],c&&a&&this.index.get(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/worker.js b/dist/module-min/worker.js
index 969b6bf..788cda8 100644
--- a/dist/module-min/worker.js
+++ b/dist/module-min/worker.js
@@ -1 +1 @@
-import{IndexOptions}from"./type.js";import{create_object,is_function,is_object,is_string}from"./common.js";import handler from"./worker/handler.js";let pid=0;export default function WorkerIndex(a={}){function b(b){function f(a){a=a.data||a;const b=a.id,c=b&&e.resolver[b];c&&(c(a.msg),delete e.resolver[b])}if(this.worker=b,this.resolver=create_object(),!!this.worker)return(d?this.worker.on("message",f):this.worker.onmessage=f,a.config)?new Promise(function(b){e.resolver[++pid]=function(){b(e)},e.worker.postMessage({id:pid,task:"init",factory:c,options:a})}):(this.worker.postMessage({task:"init",factory:c,options:a}),this)}if(!this)return new WorkerIndex(a);let c="undefined"==typeof self?"undefined"==typeof window?null:window._factory:self._factory;c&&(c=c.toString());const d="undefined"==typeof window,e=this,f=create(c,d,a.worker);return f.then?f.then(function(a){return b.call(e,a)}):b.call(this,f)}register("add"),register("append"),register("search"),register("update"),register("remove");function register(a){WorkerIndex.prototype[a]=WorkerIndex.prototype[a+"Async"]=async function(){const b=this,c=[].slice.call(arguments),d=c[c.length-1];let e;is_function(d)&&(e=d,c.splice(c.length-1,1));const f=new Promise(function(d){b.resolver[++pid]=d,b.worker.postMessage({task:a,id:pid,args:c})});return e?(f.then(e),this):f}}function create(a,b,c){let d;return d=b?"undefined"==typeof module?(0,eval)("import(\"worker_threads\").then(function(worker){ return new worker[\"Worker\"]((1,eval)(\"import.meta.dirname\") + \"/node/node.mjs\"); })"):(0,eval)("new (require(\"worker_threads\")[\"Worker\"])(__dirname + \"/node/node.js\")"):a?new window.Worker(URL.createObjectURL(new Blob(["onmessage="+handler.toString()],{type:"text/javascript"}))):new window.Worker(is_string(c)?c:(1,eval)("import.meta.url").replace("/worker.js","/worker/worker.js").replace("flexsearch.bundle.module.min.js","module/worker/worker.js"),{type:"module"}),d}
\ No newline at end of file
+import{IndexOptions}from"./type.js";import{create_object,is_function,is_object,is_string}from"./common.js";import handler from"./worker/handler.js";let pid=0;export default function WorkerIndex(a={}){function b(b){function f(a){a=a.data||a;const b=a.id,c=b&&e.resolver[b];c&&(c(a.msg),delete e.resolver[b])}if(this.worker=b,this.resolver=create_object(),!!this.worker)return(d?this.worker.on("message",f):this.worker.onmessage=f,a.config)?new Promise(function(b){e.resolver[++pid]=function(){b(e)},e.worker.postMessage({id:pid,task:"init",factory:c,options:a})}):(this.worker.postMessage({task:"init",factory:c,options:a}),this)}if(this.constructor!==WorkerIndex)return new WorkerIndex(a);let c="undefined"==typeof self?"undefined"==typeof window?null:window._factory:self._factory;c&&(c=c.toString());const d="undefined"==typeof window,e=this,f=create(c,d,a.worker);return f.then?f.then(function(a){return b.call(e,a)}):b.call(this,f)}register("add"),register("append"),register("search"),register("update"),register("remove");function register(a){WorkerIndex.prototype[a]=WorkerIndex.prototype[a+"Async"]=async function(){const b=this,c=[].slice.call(arguments),d=c[c.length-1];let e;is_function(d)&&(e=d,c.splice(c.length-1,1));const f=new Promise(function(d){b.resolver[++pid]=d,b.worker.postMessage({task:a,id:pid,args:c})});return e?(f.then(e),this):f}}function create(a,b,c){let d;return d=b?"undefined"==typeof module?(0,eval)("import(\"worker_threads\").then(function(worker){ return new worker[\"Worker\"]((1,eval)(\"import.meta.dirname\") + \"/node/node.mjs\"); })"):(0,eval)("new (require(\"worker_threads\")[\"Worker\"])(__dirname + \"/node/node.js\")"):a?new window.Worker(URL.createObjectURL(new Blob(["onmessage="+handler.toString()],{type:"text/javascript"}))):new window.Worker(is_string(c)?c:(1,eval)("import.meta.url").replace("/worker.js","/worker/worker.js").replace("flexsearch.bundle.module.min.js","module/worker/worker.js"),{type:"module"}),d}
\ No newline at end of file
diff --git a/dist/module/document.js b/dist/module/document.js
index e7bc15a..2b188fb 100644
--- a/dist/module/document.js
+++ b/dist/module/document.js
@@ -24,7 +24,7 @@ import "./document/search.js";
 
 export default function Document(options) {
 
-    if (!this) {
+    if (this.constructor !== Document) {
         return new Document(options);
     }
 
@@ -40,9 +40,8 @@ export default function Document(options) {
     keystore = options.keystore || 0;
     keystore && (this.keystore = keystore);
     this.fastupdate = !!options.fastupdate;
-    this.reg = this.fastupdate ? keystore && /* tag? */ /* stringify */ /* stringify */ /* single param */ /* skip update: */ /* append: */ /* skip update: */ /* skip_update: */
-
-    /* skip deletion */!0 /*await rows.hasNext()*/ /*await rows.hasNext()*/ /*await rows.hasNext()*/ ? new KeystoreMap(keystore) : new Map() : keystore && !0 ? new KeystoreSet(keystore) : new Set();
+    this.reg = this.fastupdate ? keystore && /* tag? */ /* stringify */ /* stringify */ /* single param */ /* skip update: */ /* append: */ /* skip update: */
+    /* skip_update: */ /* skip deletion */!0 /*await rows.hasNext()*/ /*await rows.hasNext()*/ /*await rows.hasNext()*/ ? new KeystoreMap(keystore) : new Map() : keystore && !0 ? new KeystoreSet(keystore) : new Set();
 
     // todo support custom filter function
     this.storetree = (tmp = document.store || null) && !0 !== tmp && [];
@@ -194,9 +193,11 @@ Document.prototype.commit = async function (replace, append) {
     // queued:
     // for(const index of this.index.values()){
     //     await index.db.commit(index, replace, append);
-    // }
+
     // this.reg.clear();
-};Document.prototype.destroy = function () {
+};
+
+Document.prototype.destroy = function () {
     const promises = [];
     for (const idx of this.index.values()) {
         promises.push(idx.destroy());
diff --git a/dist/module/encoder.js b/dist/module/encoder.js
index 0a16586..34818c3 100644
--- a/dist/module/encoder.js
+++ b/dist/module/encoder.js
@@ -61,7 +61,7 @@ const whitespace = /[^\p{L}\p{N}]+/u,
 
 export default function Encoder() {
 
-    if (!this) {
+    if (this.constructor !== Encoder) {
         return new Encoder(...arguments);
     }
 
diff --git a/dist/module/index.js b/dist/module/index.js
index da448b8..66cb8b9 100644
--- a/dist/module/index.js
+++ b/dist/module/index.js
@@ -29,7 +29,7 @@ import "./index/remove.js";
 
 export default function Index(options, _register) {
 
-    if (!this) {
+    if (this.constructor !== Index) {
         return new Index(options);
     }
 
diff --git a/dist/module/resolver.js b/dist/module/resolver.js
index 3c3890d..516f731 100644
--- a/dist/module/resolver.js
+++ b/dist/module/resolver.js
@@ -12,7 +12,7 @@ import "./resolve/not.js";
  */
 
 export default function Resolver(result) {
-    if (!this) {
+    if (this.constructor !== Resolver) {
         return new Resolver(result);
     }
     if (result && result.index) {
diff --git a/dist/module/serialize.js b/dist/module/serialize.js
index 033ab01..4883773 100644
--- a/dist/module/serialize.js
+++ b/dist/module/serialize.js
@@ -1,110 +1,89 @@
-// TODO return promises instead of inner await
-
 import Index from "./index.js";
 import Document from "./document.js";
 import { create_object, is_string } from "./common.js";
 
-function async(callback, self, field, key, index_doc, index, data, on_done) {
+function map_to_json(map) {
+    const json = [];
+    for (const item of map.entries()) {
+        json.push(item);
+    }
+    return json;
+}
 
-    //setTimeout(function(){
+function ctx_to_json(ctx) {
+    const json = [];
+    for (const item of ctx.entries()) {
+        json.push(map_to_json(item));
+    }
+    return json;
+}
+
+function reg_to_json(reg) {
+    const json = [];
+    for (const key of reg.keys()) {
+        json.push(key);
+    }
+    return json;
+}
+
+function save(callback, field, key, index_doc, index, data) {
 
     const res = callback(field ? field + "." + key : key, JSON.stringify(data));
 
-    // await isn't supported by ES5
-
     if (res && res.then) {
-
-        res.then(function () {
-
-            self.export(callback, self, field, index_doc, index + 1, on_done);
+        const self = this;
+        return res.then(function () {
+            return self.export(callback, field, index_doc, index + 1);
         });
-    } else {
-
-        self.export(callback, self, field, index_doc, index + 1, on_done);
     }
-    //});
+
+    return this.export(callback, field, index_doc, index + 1);
 }
 
 /**
  * @param callback
- * @param self
  * @param field
  * @param index_doc
  * @param index
- * @param on_done
  * @this {Index|Document}
  */
 
-export function exportIndex(callback, self, field, index_doc, index, on_done) {
-
-    let return_value = /* tag? */ /* stringify */ /* stringify */ /* single param */ /* skip update: */ /* append: */ /* skip update: */ /* skip_update: */ /* skip deletion */ // splice:
-    !0 /*await rows.hasNext()*/ /*await rows.hasNext()*/ /*await rows.hasNext()*/;
-    if ('undefined' == typeof on_done) {
-        return_value = new Promise(resolve => {
-            on_done = resolve;
-        });
-    }
+export function exportIndex(callback, field, index_doc, index = 0) {
 
     let key, data;
 
-    switch (index || (index = 0)) {
+    switch (index) {
 
         case 0:
 
             key = "reg";
-
-            // fastupdate isn't supported by export
-
-            if (this.fastupdate) {
-
-                data = create_object();
-
-                for (let key of this.reg.keys()) {
-
-                    data[key] = 1;
-                }
-            } else {
-
-                data = this.reg;
-            }
-
+            data = reg_to_json(this.reg);
             break;
 
         case 1:
 
             key = "cfg";
-            data = {
-                doc: 0,
-                opt: this.optimize ? 1 : 0
-            };
-
+            data = {};
             break;
 
         case 2:
 
             key = "map";
-            data = this.map;
+            data = map_to_json(this.map);
             break;
 
         case 3:
 
             key = "ctx";
-            data = this.ctx;
+            data = ctx_to_json(this.ctx);
             break;
 
         default:
 
-            if ('undefined' == typeof field && on_done) {
-
-                on_done();
-            }
-
             return;
     }
 
-    async(callback, self || this, field, key, index_doc, index, data, on_done);
-
-    return return_value;
+    return save.call(this, callback, field, key, index_doc, index, data);
 }
 
 /**
@@ -114,38 +93,32 @@ export function exportIndex(callback, self, field, index_doc, index, on_done) {
 export function importIndex(key, data) {
 
     if (!data) {
-
         return;
     }
-
     if (is_string(data)) {
-
         data = JSON.parse(data);
     }
 
     switch (key) {
 
         case "cfg":
-
-            this.optimize = !!data.opt;
             break;
 
         case "reg":
 
-            // fastupdate isn't supported by import
-
+            // fast update isn't supported by export/import
             this.fastupdate = /* suggest */ /* append: */ /* enrich */!1;
-            this.reg = data;
+            this.reg = new Set(data);
             break;
 
         case "map":
 
-            this.map = data;
+            this.map = new Map(data);
             break;
 
         case "ctx":
 
-            this.ctx = data;
+            this.ctx = new Map(data);
             break;
     }
 }
@@ -154,71 +127,63 @@ export function importIndex(key, data) {
  * @this Document
  */
 
-export function exportDocument(callback, self, field, index_doc, index, on_done) {
-
-    let return_value;
-    if ('undefined' == typeof on_done) {
-        return_value = new Promise(resolve => {
-            on_done = resolve;
-        });
-    }
-
-    index || (index = 0);
-    index_doc || (index_doc = 0);
+export function exportDocument(callback, field, index_doc = 0, index = 0) {
 
     if (index_doc < this.field.length) {
         const field = this.field[index_doc],
-              idx = this.index[field];
+              idx = this.index.get(field),
+              res = idx.export(callback, field, index_doc, index = 1);
+        // start from index 1, because document indexes does not additionally store register
 
-
-        self = this;
-
-        //setTimeout(function(){
-
-        if (!idx.export(callback, self, index ? field /*.replace(":", "-")*/ : "", index_doc, index++, on_done)) {
-
-            index_doc++;
-            index = 1;
-
-            self.export(callback, self, field, index_doc, index, on_done);
+        if (res && res.then) {
+            const self = this;
+            return res.then(function () {
+                return self.export(callback, field, index_doc + 1, index = 0);
+            });
         }
-        //});
+
+        return this.export(callback, field, index_doc + 1, index = 0);
     } else {
 
         let key, data;
 
         switch (index) {
 
+            case 0:
+
+                key = "reg";
+                data = reg_to_json(this.reg);
+                field = null;
+                break;
+
             case 1:
 
                 key = "tag";
-                data = this.tagindex;
+                data = ctx_to_json(this.tag);
                 field = null;
                 break;
 
             case 2:
 
-                key = "store";
-                data = this.store;
+                key = "doc";
+                data = map_to_json(this.store);
                 field = null;
                 break;
 
-            // case 3:
-            //
-            //     key = "reg";
-            //     data = this.register;
-            //     break;
+            case 3:
+
+                key = "cfg";
+                data = {};
+                field = null;
+                break;
 
             default:
 
-                on_done();
                 return;
         }
 
-        async(callback, this, field, key, index_doc, index, data, on_done);
+        return save.call(this, callback, field, key, index_doc, index, data);
     }
-
-    return return_value;
 }
 
 /**
@@ -228,12 +193,9 @@ export function exportDocument(callback, self, field, index_doc, index, on_done)
 export function importDocument(key, data) {
 
     if (!data) {
-
         return;
     }
-
     if (is_string(data)) {
-
         data = JSON.parse(data);
     }
 
@@ -241,28 +203,26 @@ export function importDocument(key, data) {
 
         case "tag":
 
-            this.tagindex = data;
+            this.tagindex = new Map(data);
             break;
 
         case "reg":
 
-            // fastupdate isn't supported by import
-
+            // fast update isn't supported by export/import
             this.fastupdate = !1;
-            this.reg = data;
+            this.reg = new Set(data);
 
-            for (let i = 0, index; i < this.field.length; i++) {
-
-                index = this.index[this.field[i]];
-                index.reg = data;
-                index.fastupdate = !1;
+            for (let i = 0, idx; i < this.field.length; i++) {
+                idx = this.index.get(this.field[i]);
+                idx.fastupdate = !1;
+                idx.reg = this.reg;
             }
 
             break;
 
-        case "store":
+        case "doc":
 
-            this.store = data;
+            this.store = new Map(data);
             break;
 
         default:
@@ -272,8 +232,7 @@ export function importDocument(key, data) {
             key = key[1];
 
             if (field && key) {
-
-                this.index[field].import(key, data);
+                this.index.get(field).import(key, data);
             }
     }
 }
@@ -290,7 +249,8 @@ ctx: "gulliver+travel:1,2,3|4,5,6|7,8,9;"
  * @return {string}
  */
 
-export function serialize(withFunctionWrapper = !0) {
+export function serialize(withFunctionWrapper = /* tag? */ /* stringify */ /* stringify */ /* single param */ /* skip update: */ /* append: */ /* skip update: */ /* skip_update: */ /* skip deletion */ // splice:
+!0 /*await rows.hasNext()*/ /*await rows.hasNext()*/ /*await rows.hasNext()*/) {
 
     if (!this.reg.size) return "";
 
diff --git a/dist/module/worker.js b/dist/module/worker.js
index 601abc1..2a23bd3 100644
--- a/dist/module/worker.js
+++ b/dist/module/worker.js
@@ -11,7 +11,7 @@ let pid = 0;
 
 export default function WorkerIndex(options = {}) {
 
-    if (!this) {
+    if (this.constructor !== WorkerIndex) {
         return new WorkerIndex(options);
     }
 
diff --git a/example/nodejs-commonjs/basic-persistent/package.json b/example/nodejs-commonjs/basic-persistent/package.json
index 8c1358c..19b2f61 100644
--- a/example/nodejs-commonjs/basic-persistent/package.json
+++ b/example/nodejs-commonjs/basic-persistent/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "nodejs-commonjs-document",
+  "name": "nodejs-commonjs-basic-persistent",
   "dependencies": {
     "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview",
     "sqlite3": "^5.1.7"
diff --git a/example/nodejs-commonjs/basic-resolver/package.json b/example/nodejs-commonjs/basic-resolver/package.json
index 2fbc471..c947a79 100644
--- a/example/nodejs-commonjs/basic-resolver/package.json
+++ b/example/nodejs-commonjs/basic-resolver/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "nodejs-commonjs-document",
+  "name": "nodejs-commonjs-basic-resolver",
   "dependencies": {
     "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview"
   }
diff --git a/example/nodejs-commonjs/basic-suggestion/package.json b/example/nodejs-commonjs/basic-suggestion/package.json
index 2fbc471..4863964 100644
--- a/example/nodejs-commonjs/basic-suggestion/package.json
+++ b/example/nodejs-commonjs/basic-suggestion/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "nodejs-commonjs-document",
+  "name": "nodejs-commonjs-basic-suggestion",
   "dependencies": {
     "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview"
   }
diff --git a/example/nodejs-commonjs/basic-worker-extern-config/package.json b/example/nodejs-commonjs/basic-worker-extern-config/package.json
index b98f398..d7c1a89 100644
--- a/example/nodejs-commonjs/basic-worker-extern-config/package.json
+++ b/example/nodejs-commonjs/basic-worker-extern-config/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "nodejs-esm-document-worker",
+  "name": "nodejs-esm-basic-worker-extern-config",
   "type": "module",
   "dependencies": {
     "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview"
diff --git a/example/nodejs-commonjs/basic-worker/package.json b/example/nodejs-commonjs/basic-worker/package.json
index b98f398..6cf6e7a 100644
--- a/example/nodejs-commonjs/basic-worker/package.json
+++ b/example/nodejs-commonjs/basic-worker/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "nodejs-esm-document-worker",
+  "name": "nodejs-esm-basic-worker",
   "type": "module",
   "dependencies": {
     "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview"
diff --git a/example/nodejs-commonjs/basic/package.json b/example/nodejs-commonjs/basic/package.json
index 2fbc471..63d6f1c 100644
--- a/example/nodejs-commonjs/basic/package.json
+++ b/example/nodejs-commonjs/basic/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "nodejs-commonjs-document",
+  "name": "nodejs-commonjs-basic",
   "dependencies": {
     "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview"
   }
diff --git a/example/nodejs-commonjs/language-pack/package.json b/example/nodejs-commonjs/language-pack/package.json
index 2fbc471..1143c66 100644
--- a/example/nodejs-commonjs/language-pack/package.json
+++ b/example/nodejs-commonjs/language-pack/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "nodejs-commonjs-document",
+  "name": "nodejs-commonjs-language-pack",
   "dependencies": {
     "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview"
   }
diff --git a/example/nodejs-esm/basic-persistent/package.json b/example/nodejs-esm/basic-persistent/package.json
index 2232aed..0f3dc72 100644
--- a/example/nodejs-esm/basic-persistent/package.json
+++ b/example/nodejs-esm/basic-persistent/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "nodejs-commonjs-document",
+  "name": "nodejs-esm-basic-persistent",
   "type": "module",
   "dependencies": {
     "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview",
diff --git a/example/nodejs-esm/basic-resolver/package.json b/example/nodejs-esm/basic-resolver/package.json
index 9800214..23972d1 100644
--- a/example/nodejs-esm/basic-resolver/package.json
+++ b/example/nodejs-esm/basic-resolver/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "nodejs-commonjs-document",
+  "name": "nodejs-esm-basic-resolver",
   "type": "module",
   "dependencies": {
     "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview"
diff --git a/example/nodejs-esm/basic-suggestion/package.json b/example/nodejs-esm/basic-suggestion/package.json
index 9800214..9daf7f5 100644
--- a/example/nodejs-esm/basic-suggestion/package.json
+++ b/example/nodejs-esm/basic-suggestion/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "nodejs-commonjs-document",
+  "name": "nodejs-esm-basic-suggestion",
   "type": "module",
   "dependencies": {
     "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview"
diff --git a/example/nodejs-esm/basic-worker-extern-config/package.json b/example/nodejs-esm/basic-worker-extern-config/package.json
index b98f398..d7c1a89 100644
--- a/example/nodejs-esm/basic-worker-extern-config/package.json
+++ b/example/nodejs-esm/basic-worker-extern-config/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "nodejs-esm-document-worker",
+  "name": "nodejs-esm-basic-worker-extern-config",
   "type": "module",
   "dependencies": {
     "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview"
diff --git a/example/nodejs-esm/basic-worker/package.json b/example/nodejs-esm/basic-worker/package.json
index b98f398..6cf6e7a 100644
--- a/example/nodejs-esm/basic-worker/package.json
+++ b/example/nodejs-esm/basic-worker/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "nodejs-esm-document-worker",
+  "name": "nodejs-esm-basic-worker",
   "type": "module",
   "dependencies": {
     "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview"
diff --git a/example/nodejs-esm/basic/package.json b/example/nodejs-esm/basic/package.json
index 9800214..7ef8fc4 100644
--- a/example/nodejs-esm/basic/package.json
+++ b/example/nodejs-esm/basic/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "nodejs-commonjs-document",
+  "name": "nodejs-esm-basic",
   "type": "module",
   "dependencies": {
     "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview"
diff --git a/example/nodejs-esm/language-pack/package.json b/example/nodejs-esm/language-pack/package.json
index 2fbc471..8e49be9 100644
--- a/example/nodejs-esm/language-pack/package.json
+++ b/example/nodejs-esm/language-pack/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "nodejs-commonjs-document",
+  "name": "nodejs-esm-language-pack",
   "dependencies": {
     "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview"
   }
diff --git a/package.json b/package.json
index 9b5c8ff..53a3bf5 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
   "preferGlobal": false,
   "name": "flexsearch",
   "version": "0.8.0",
-  "description": "Next-Generation full text search library with zero dependencies for Browser and Node.js",
+  "description": "Next-Generation full-text search library for Browser and Node.js",
   "homepage": "https://github.com/nextapps-de/flexsearch/",
   "author": "Thomas Wilkerling",
   "copyright": "Nextapps GmbH",
diff --git a/src/document.js b/src/document.js
index ff815d0..ed6cfdb 100644
--- a/src/document.js
+++ b/src/document.js
@@ -38,7 +38,7 @@ import "./document/search.js";
 
 export default function Document(options){
 
-    if(!this) {
+    if(this.constructor !== Document) {
         return new Document(options);
     }
 
diff --git a/src/encoder.js b/src/encoder.js
index aa92c43..b316d47 100644
--- a/src/encoder.js
+++ b/src/encoder.js
@@ -63,7 +63,7 @@ const normalize = "".normalize && /[\u0300-\u036f]/g; // '´`’ʼ.,
 
 export default function Encoder(options){
 
-    if(!this){
+    if(this.constructor !== Encoder){
         return new Encoder(...arguments);
     }
 
diff --git a/src/index.js b/src/index.js
index 497a110..44739d5 100644
--- a/src/index.js
+++ b/src/index.js
@@ -47,7 +47,7 @@ import "./index/remove.js";
 
 export default function Index(options, _register){
 
-    if(!this){
+    if(this.constructor !== Index){
         return new Index(options);
     }
 
diff --git a/src/resolver.js b/src/resolver.js
index 83f6a17..2078d6f 100644
--- a/src/resolver.js
+++ b/src/resolver.js
@@ -12,7 +12,7 @@ import "./resolve/not.js";
  */
 
 export default function Resolver(result){
-    if(!this){
+    if(this.constructor !== Resolver){
         return new Resolver(result);
     }
     if(result && result.index){
diff --git a/src/serialize.js b/src/serialize.js
index 5b74fb8..d1780ec 100644
--- a/src/serialize.js
+++ b/src/serialize.js
@@ -1,111 +1,89 @@
-// TODO return promises instead of inner await
-
 import Index from "./index.js";
 import Document from "./document.js";
 import { create_object, is_string } from "./common.js";
 
-function async(callback, self, field, key, index_doc, index, data, on_done){
+function map_to_json(map){
+    const json = [];
+    for(const item of map.entries()){
+        json.push(item);
+    }
+    return json;
+}
 
-    //setTimeout(function(){
+function ctx_to_json(ctx){
+    const json = [];
+    for(const item of ctx.entries()){
+        json.push(map_to_json(item));
+    }
+    return json;
+}
 
-        const res = callback(field ? field + "." + key : key, JSON.stringify(data));
+function reg_to_json(reg){
+    const json = [];
+    for(const key of reg.keys()){
+        json.push(key);
+    }
+    return json;
+}
 
-        // await isn't supported by ES5
+function save(callback, field, key, index_doc, index, data){
 
-        if(res && res["then"]){
+    const res = callback(field ? field + "." + key : key, JSON.stringify(data));
 
-            res["then"](function(){
+    if(res && res["then"]){
+        const self = this;
+        return res["then"](function(){
+            return self.export(callback, field, index_doc, index + 1);
+        });
+    }
 
-                self.export(callback, self, field, index_doc, index + 1, on_done);
-            })
-        }
-        else{
-
-            self.export(callback, self, field, index_doc, index + 1, on_done);
-        }
-    //});
+    return this.export(callback, field, index_doc, index + 1);
 }
 
 /**
  * @param callback
- * @param self
  * @param field
  * @param index_doc
  * @param index
- * @param on_done
  * @this {Index|Document}
  */
 
-export function exportIndex(callback, self, field, index_doc, index, on_done){
-
-    let return_value = true
-    if (typeof on_done === 'undefined') {
-        return_value = new Promise((resolve) => {
-            on_done = resolve
-        })
-    }
+export function exportIndex(callback, field, index_doc, index = 0){
 
     let key, data;
 
-    switch(index || (index = 0)){
+    switch(index){
 
         case 0:
 
             key = "reg";
-
-            // fastupdate isn't supported by export
-
-            if(this.fastupdate){
-
-                data = create_object();
-
-                for(let key of this.reg.keys()){
-
-                    data[key] = 1;
-                }
-            }
-            else{
-
-                data = this.reg;
-            }
-
+            data = reg_to_json(this.reg);
             break;
 
         case 1:
 
             key = "cfg";
-            data = {
-                "doc": 0,
-                "opt": this.optimize ? 1 : 0
-            };
-
+            data = {};
             break;
 
         case 2:
 
             key = "map";
-            data = this.map;
+            data = map_to_json(this.map);
             break;
 
         case 3:
 
             key = "ctx";
-            data = this.ctx;
+            data = ctx_to_json(this.ctx);
             break;
 
         default:
 
-            if (typeof field === 'undefined' && on_done) {
-
-                on_done();
-            }
-
             return;
     }
 
-    async(callback, self || this, field, key, index_doc, index, data, on_done);
-
-    return return_value;
+    return save.call(this, callback, field, key, index_doc, index, data);
 }
 
 /**
@@ -115,38 +93,32 @@ export function exportIndex(callback, self, field, index_doc, index, on_done){
 export function importIndex(key, data){
 
     if(!data){
-
         return;
     }
-
     if(is_string(data)){
-
         data = JSON.parse(data);
     }
 
     switch(key){
 
         case "cfg":
-
-            this.optimize = !!data["opt"];
             break;
 
         case "reg":
 
-            // fastupdate isn't supported by import
-
+            // fast update isn't supported by export/import
             this.fastupdate = false;
-            this.reg = data;
+            this.reg = new Set(data);
             break;
 
         case "map":
 
-            this.map = data;
+            this.map = new Map(data);
             break;
 
         case "ctx":
 
-            this.ctx = data;
+            this.ctx = new Map(data);
             break;
     }
 }
@@ -155,35 +127,23 @@ export function importIndex(key, data){
  * @this Document
  */
 
-export function exportDocument(callback, self, field, index_doc, index, on_done){
-
-    let return_value
-    if (typeof on_done === 'undefined') {
-        return_value = new Promise((resolve) => {
-            on_done = resolve
-        })
-    }
-
-    index || (index = 0);
-    index_doc || (index_doc = 0);
+export function exportDocument(callback, field, index_doc = 0, index = 0){
 
     if(index_doc < this.field.length){
 
         const field = this.field[index_doc];
-        const idx = this.index[field];
+        const idx = this.index.get(field);
+        // start from index 1, because document indexes does not additionally store register
+        const res = idx.export(callback, field, index_doc, index = 1);
 
-        self = this;
+        if(res && res["then"]){
+            const self = this;
+            return res["then"](function(){
+                return self.export(callback, field, index_doc + 1, index = 0);
+            });
+        }
 
-        //setTimeout(function(){
-
-            if(!idx.export(callback, self, index ? field/*.replace(":", "-")*/ : "", index_doc, index++, on_done)){
-
-                index_doc++;
-                index = 1;
-
-                self.export(callback, self, field, index_doc, index, on_done);
-            }
-        //});
+        return this.export(callback, field, index_doc + 1, index = 0);
     }
     else{
 
@@ -191,36 +151,41 @@ export function exportDocument(callback, self, field, index_doc, index, on_done)
 
         switch(index){
 
+            case 0:
+
+                key = "reg";
+                data = reg_to_json(this.reg);
+                field = null;
+                break;
+
             case 1:
 
                 key = "tag";
-                data = this.tagindex;
+                data = ctx_to_json(this.tag);
                 field = null;
                 break;
 
             case 2:
 
-                key = "store";
-                data = this.store;
+                key = "doc";
+                data = map_to_json(this.store);
                 field = null;
                 break;
 
-            // case 3:
-            //
-            //     key = "reg";
-            //     data = this.register;
-            //     break;
+            case 3:
+
+                key = "cfg";
+                data = {};
+                field = null;
+                break;
 
             default:
 
-                on_done();
                 return;
         }
 
-        async(callback, this, field, key, index_doc, index, data, on_done);
+        return save.call(this, callback, field, key, index_doc, index, data);
     }
-    
-    return return_value
 }
 
 /**
@@ -230,12 +195,9 @@ export function exportDocument(callback, self, field, index_doc, index, on_done)
 export function importDocument(key, data){
 
     if(!data){
-
         return;
     }
-
     if(is_string(data)){
-
         data = JSON.parse(data);
     }
 
@@ -243,28 +205,26 @@ export function importDocument(key, data){
 
         case "tag":
 
-            this.tagindex = data;
+            this.tagindex = new Map(data);
             break;
 
         case "reg":
 
-            // fastupdate isn't supported by import
-
+            // fast update isn't supported by export/import
             this.fastupdate = false;
-            this.reg = data;
+            this.reg = new Set(data);
 
-            for(let i = 0, index; i < this.field.length; i++){
-
-                index = this.index[this.field[i]];
-                index.reg = data;
-                index.fastupdate = false;
+            for(let i = 0, idx; i < this.field.length; i++){
+                idx = this.index.get(this.field[i]);
+                idx.fastupdate = false;
+                idx.reg = this.reg;
             }
 
             break;
 
-        case "store":
+        case "doc":
 
-            this.store = data;
+            this.store = new Map(data);
             break;
 
         default:
@@ -274,8 +234,7 @@ export function importDocument(key, data){
             key = key[1];
 
             if(field && key){
-
-                this.index[field].import(key, data);
+                this.index.get(field).import(key, data);
             }
     }
 }
diff --git a/src/worker.js b/src/worker.js
index 314a14d..e69c36d 100644
--- a/src/worker.js
+++ b/src/worker.js
@@ -11,7 +11,7 @@ let pid = 0;
 
 export default function WorkerIndex(options = {}){
 
-    if(!this) {
+    if(this.constructor !== WorkerIndex) {
         return new WorkerIndex(options);
     }