From 41b55bead66790fc64dd1592e8f873c9d4f86f6b Mon Sep 17 00:00:00 2001
From: Thomas Wilkerling <thomas@nextapps.de>
Date: Sat, 15 Mar 2025 16:08:56 +0100
Subject: [PATCH] chunked export/import

---
 README.md                               |  29 +-
 dist/db/indexeddb/index.cjs             | 343 ++++++++++---------
 dist/flexsearch.bundle.debug.js         | 374 +++++++++++----------
 dist/flexsearch.bundle.min.js           | 109 ++++---
 dist/flexsearch.bundle.module.debug.js  | 368 +++++++++++----------
 dist/flexsearch.bundle.module.min.js    | 111 ++++---
 dist/flexsearch.compact.debug.js        | 282 +++++++++-------
 dist/flexsearch.compact.min.js          |  79 ++---
 dist/flexsearch.compact.module.debug.js | 310 ++++++++++--------
 dist/flexsearch.compact.module.min.js   |  81 ++---
 dist/flexsearch.es5.debug.js            | 416 +++++++++++++-----------
 dist/flexsearch.es5.min.js              | 127 ++++----
 dist/flexsearch.light.debug.js          |   4 +-
 dist/flexsearch.light.min.js            |   6 +-
 dist/flexsearch.light.module.debug.js   |   4 +-
 dist/flexsearch.light.module.min.js     |   6 +-
 dist/lang/de.min.js                     |  74 ++++-
 dist/lang/en.min.js                     |  74 ++++-
 dist/lang/fr.min.js                     |  74 ++++-
 dist/module-debug/document.js           |  10 +-
 dist/module-debug/encoder.js            |   2 +-
 dist/module-debug/index.js              |   2 +-
 dist/module-debug/resolver.js           |   2 +-
 dist/module-debug/serialize.js          | 307 ++++++++---------
 dist/module-debug/worker.js             |   2 +-
 dist/module-min/document.js             |   2 +-
 dist/module-min/encoder.js              |   2 +-
 dist/module-min/index.js                |   2 +-
 dist/module-min/resolver.js             |   2 +-
 dist/module-min/serialize.js            |   2 +-
 dist/module-min/worker.js               |   2 +-
 dist/module/document.js                 |  10 +-
 dist/module/encoder.js                  |   2 +-
 dist/module/index.js                    |   2 +-
 dist/module/resolver.js                 |   2 +-
 dist/module/serialize.js                | 307 ++++++++---------
 dist/module/worker.js                   |   2 +-
 src/document.js                         |   2 +-
 src/encoder.js                          |   2 +-
 src/index.js                            |   2 +-
 src/resolver.js                         |   2 +-
 src/serialize.js                        | 339 ++++++++++---------
 src/worker.js                           |   2 +-
 task/build.js                           |  11 +-
 44 files changed, 2177 insertions(+), 1716 deletions(-)

diff --git a/README.md b/README.md
index 7f83ea7..71064cd 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,7 @@ npm install git+https://github.com/nextapps-de/flexsearch/tree/v0.8-preview
 - Custom Score Function
 - Added French language preset (stop-word filter, stemmer)
 - Enhanced Worker Support
+- Export / Import index in chunks
 - Improved Build System + Bundler (Supported: CommonJS, ESM, Global Namespace), also the import of language packs are now supported for Node.js
 - Full covering index.d.ts type definitions
 - Fast-Boot Serialization optimized for Server-Side-Rendering (PHP, Python, Ruby, Rust, Java, Go, Node.js, ...)
@@ -2273,7 +2274,7 @@ A formula to determine a well-balanced value for the `resolution` is: $2*floor(\
 
 > Persistent-Indexes and Worker-Indexes don't support Import/Export.
 
-Export a simple `Index` to the folder `/export/`:
+Export an `Index` or `Document-Index` to the folder `/export/`:
 
 ```js
 import { promises as fs } from "fs";
@@ -2283,7 +2284,7 @@ await index.export(async function(key, data){
 });
 ```
 
-Import from folder `/export/` into a simple `Index`:
+Import from folder `/export/` into an `Index` or `Document-Index`:
 
 ```js
 const index = new Index({/* keep old config and place it here */});
@@ -2295,29 +2296,7 @@ for(let i = 0; i < files.length; i++){
 }
 ```
 
-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);
-}
-```
+> You'll need to use the same configuration as you used before the export. Any changes on the configuration needs to be re-indexed.
 
 ## Migration
 
diff --git a/dist/db/indexeddb/index.cjs b/dist/db/indexeddb/index.cjs
index fde7f8f..e772dc9 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.constructor !== Encoder){
+    if(!this || this.constructor !== Encoder){
         return new Encoder(...arguments);
     }
 
@@ -1009,7 +1009,7 @@ let pid = 0;
 
 function WorkerIndex(options = {}){
 
-    if(this.constructor !== WorkerIndex) {
+    if(!this || this.constructor !== WorkerIndex) {
         return new WorkerIndex(options);
     }
 
@@ -1245,80 +1245,172 @@ function register(key){
     };
 }
 
-function map_to_json(map){
-    const json = [];
+const chunk_size_reg = 250000;
+const chunk_size_map = 5000;
+const chunk_size_ctx = 1000;
+
+function map_to_json(map, size = 0){
+    let chunk = [];
+    let json = [];
+    if(size){
+        size = chunk_size_map * (chunk_size_reg / size) | 0;
+    }
     for(const item of map.entries()){
         json.push(item);
+        if(json.length === size){
+            chunk.push(json);
+            json = [];
+        }
     }
-    return json;
+    json.length && chunk.push(json);
+    return chunk;
 }
 
-function ctx_to_json(ctx){
-    const json = [];
-    for(const item of ctx.entries()){
-        json.push(map_to_json(item));
+function json_to_map(json, map){
+    map || (map = new Map());
+    for(let i = 0, entry; i < json.length; i++) {
+        entry = json[i];
+        map.set(entry[0], entry[1]);
     }
-    return json;
+    return map;
+}
+
+function ctx_to_json(ctx, size = 0){
+    let chunk = [];
+    let json = [];
+    if(size){
+        size = chunk_size_ctx * (chunk_size_reg / size) | 0;
+    }
+    for(const item of ctx.entries()){
+        const key = item[0];
+        const value = item[1];
+        json.push([key, map_to_json(value)[0]]);
+        if(json.length === size){
+            chunk.push(json);
+            json = [];
+        }
+    }
+    json.length && chunk.push(json);
+    return chunk;
+}
+
+function json_to_ctx(json, ctx){
+    ctx || (ctx = new Map());
+    for(let i = 0, entry, map; i < json.length; i++) {
+        entry = json[i];
+        map = ctx.get(entry[0]);
+        ctx.set(entry[0], json_to_map(entry[1], map));
+    }
+    return ctx;
 }
 
 function reg_to_json(reg){
-    const json = [];
+    let chunk = [];
+    let json = [];
     for(const key of reg.keys()){
         json.push(key);
+        if(json.length === chunk_size_reg){
+            chunk.push(json);
+            json = [];
+        }
     }
-    return json;
+    json.length && chunk.push(json);
+    return chunk;
 }
 
-function save(callback, field, key, index_doc, index, data){
+function json_to_reg(json, reg){
+    reg || (reg = new Set());
+    for(let i = 0; i < json.length; i++) {
+        reg.add(json[i]);
+    }
+    return reg;
+}
 
-    const res = callback(field ? field + "." + key : key, JSON.stringify(data));
+/**
+ * @this {Index|Document}
+ */
+
+function save(callback, field, key, chunk, index_doc, index_obj, index_prt = 0){
+
+    const is_arr = chunk && chunk.constructor === Array;
+    const data = is_arr ? chunk.shift() : chunk;
+    if(!data){
+        return this.export(
+            callback,
+            field,
+            index_doc,
+            index_obj + 1
+        );
+    }
+
+    const res = callback(
+        (field ? field + "." : "") + (index_prt + 1) + "." + key,
+        JSON.stringify(data)
+    );
 
     if(res && res["then"]){
         const self = this;
         return res["then"](function(){
-            return self.export(callback, field, index_doc, index + 1);
+            return save.call(self,
+                callback,
+                field,
+                key,
+                is_arr ? chunk : null,
+                index_doc,
+                index_obj,
+                index_prt + 1
+            );
         });
     }
 
-    return this.export(callback, field, index_doc, index + 1);
+    return save.call(this,
+        callback,
+        field,
+        key,
+        is_arr ? chunk : null,
+        index_doc,
+        index_obj,
+        index_prt + 1
+    );
 }
 
 /**
  * @param callback
  * @param field
  * @param index_doc
- * @param index
- * @this {Index|Document}
+ * @param index_obj
+ * @this {Index}
  */
 
-function exportIndex(callback, field, index_doc, index = 0){
+function exportIndex(callback, field, index_doc, index_obj = 0){
 
-    let key, data;
+    let key, chunk;
 
-    switch(index){
+    switch(index_obj){
 
         case 0:
 
             key = "reg";
-            data = reg_to_json(this.reg);
+            chunk = reg_to_json(this.reg);
             break;
 
         case 1:
 
+            // todo
             key = "cfg";
-            data = {};
+            chunk = {};
             break;
 
         case 2:
 
             key = "map";
-            data = map_to_json(this.map);
+            chunk = map_to_json(this.map, this.reg.size);
             break;
 
         case 3:
 
             key = "ctx";
-            data = ctx_to_json(this.ctx);
+            chunk = ctx_to_json(this.ctx, this.reg.size);
             break;
 
         default:
@@ -1326,11 +1418,18 @@ function exportIndex(callback, field, index_doc, index = 0){
             return;
     }
 
-    return save.call(this, callback, field, key, index_doc, index, data);
+    return save.call(this,
+        callback,
+        field,
+        key,
+        chunk,
+        index_doc,
+        index_obj
+    );
 }
 
 /**
- * @this Index
+ * @this {Index}
  */
 
 function importIndex(key, data){
@@ -1342,83 +1441,90 @@ function importIndex(key, data){
         data = JSON.parse(data);
     }
 
+    key = key.split(".");
+    if(key[key.length - 1] === "json"){
+        key.pop();
+    }
+    key = key.length > 1 ? key[1] : key[0];
+
     switch(key){
 
         case "cfg":
+            // todo
             break;
 
         case "reg":
 
             // fast update isn't supported by export/import
             this.fastupdate = false;
-            this.reg = new Set(data);
+            this.reg = json_to_reg(data, this.reg);
             break;
 
         case "map":
 
-            this.map = new Map(data);
+            this.map = json_to_map(data, this.map);
             break;
 
         case "ctx":
 
-            this.ctx = new Map(data);
+            this.ctx = json_to_ctx(data, this.ctx);
             break;
     }
 }
 
 /**
- * @this Document
+ * @this {Document}
  */
 
-function exportDocument(callback, field, index_doc = 0, index = 0){
+function exportDocument(callback, field, index_doc = 0, index_obj = 0){
 
     if(index_doc < this.field.length){
 
         const field = this.field[index_doc];
         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);
+        const res = idx.export(callback, field, index_doc, index_obj = 1);
 
         if(res && res["then"]){
             const self = this;
             return res["then"](function(){
-                return self.export(callback, field, index_doc + 1, index = 0);
+                return self.export(callback, field, index_doc + 1);
             });
         }
 
-        return this.export(callback, field, index_doc + 1, index = 0);
+        return this.export(callback, field, index_doc + 1);
     }
     else {
 
-        let key, data;
+        let key, chunk;
 
-        switch(index){
+        switch(index_obj){
 
             case 0:
 
                 key = "reg";
-                data = reg_to_json(this.reg);
+                chunk = reg_to_json(this.reg);
                 field = null;
                 break;
 
             case 1:
 
                 key = "tag";
-                data = ctx_to_json(this.tag);
+                chunk = ctx_to_json(this.tag, this.reg.size);
                 field = null;
                 break;
 
             case 2:
 
                 key = "doc";
-                data = map_to_json(this.store);
+                chunk = map_to_json(this.store);
                 field = null;
                 break;
 
             case 3:
 
                 key = "cfg";
-                data = {};
+                chunk = {};
                 field = null;
                 break;
 
@@ -1427,12 +1533,19 @@ function exportDocument(callback, field, index_doc = 0, index = 0){
                 return;
         }
 
-        return save.call(this, callback, field, key, index_doc, index, data);
+        return save.call(this,
+            callback,
+            field,
+            key,
+            chunk,
+            index_doc,
+            index_obj
+        );
     }
 }
 
 /**
- * @this Document
+ * @this {Document}
  */
 
 function importDocument(key, data){
@@ -1444,41 +1557,46 @@ function importDocument(key, data){
         data = JSON.parse(data);
     }
 
-    switch(key){
+    key = key.split(".");
+    if(key[key.length - 1] === "json"){
+        key.pop();
+    }
+    const field = key.length > 2 ? key[0] : "";
+    key = key.length > 2 ? key[2] : key[1];
 
-        case "tag":
+    if(!field){
 
-            this.tagindex = new Map(data);
-            break;
+        switch(key){
 
-        case "reg":
+            case "reg":
 
-            // fast update isn't supported by export/import
-            this.fastupdate = false;
-            this.reg = new Set(data);
+                // fast update isn't supported by export/import
+                this.fastupdate = false;
+                this.reg = json_to_reg(data, this.reg);
 
-            for(let i = 0, idx; i < this.field.length; i++){
-                idx = this.index.get(this.field[i]);
-                idx.fastupdate = false;
-                idx.reg = this.reg;
-            }
+                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;
+                break;
 
-        case "doc":
+            case "tag":
 
-            this.store = new Map(data);
-            break;
+                this.tag = json_to_ctx(data, this.tag);
+                break;
 
-        default:
+            case "doc":
 
-            key = key.split(".");
-            const field = key[0];
-            key = key[1];
+                this.store = json_to_map(data, this.store);
+                break;
 
-            if(field && key){
-                this.index.get(field).import(key, data);
-            }
+        }
+    }
+    else {
+
+        return this.index.get(field).import(key, data);
     }
 }
 
@@ -1556,91 +1674,6 @@ function serialize(withFunctionWrapper = true){
         : reg + map + ctx
 }
 
-// export function exportSnapshot(flexsearch){
-//
-//     if(!flexsearch.reg.size) return;
-//
-//     let reg = '';
-//     let type = "";
-//     for(const key of flexsearch.reg.keys()){
-//         type || (type = typeof key);
-//         reg += (reg ? ',' : '') + (type === "string" ? '"' + key + '"' : key);
-//     }
-//     reg = "f.reg=[" + reg + "];";
-//
-//     let map = '';
-//     for(const item of flexsearch.map.entries()){
-//         const key = item[0];
-//         const value = item[1];
-//         let res = '';
-//         for(let i = 0, ids; i < value.length; i++){
-//             ids = value[i] || [''];
-//             let str = '';
-//             for(let j = 0; j < ids.length; j++){
-//                 str += (str ? ',' : '') + (type === "string" ? '"' + ids[j] + '"' : ids[j]);
-//             }
-//             str = "[
-//             res += (res ? '|' : '') + str;
-//         }
-//         map += (map ? ';' : '') + key + ':' + res;
-//     }
-//
-//
-//     let ctx = '';
-//     for(const context of flexsearch.ctx.entries()){
-//         const key_ctx = context[0];
-//         const value_ctx = context[1];
-//
-//         for(const item of value_ctx.entries()){
-//             const key = item[0];
-//             const value = item[1];
-//
-//             let res = '';
-//             for(let i = 0, ids; i < value.length; i++){
-//                 ids = value[i] || [''];
-//                 let str = '';
-//                 for(let j = 0; j < ids.length; j++){
-//                     str += (str ? ',' : '') + (type === "string" ? '"' + ids[j] + '"' : ids[j]);
-//                 }
-//                 res += (res ? '|' : '') + str;
-//             }
-//             ctx += (ctx ? ';' : '') + key_ctx + '+' + key + ':' + res;
-//         }
-//     }
-//
-//     return reg + '#' + map + '#' + ctx;
-// }
-//
-// export function importSnapshot(flexsearch, input){
-//
-//     if(!input) return;
-//
-//     let pos_reg = input.indexOf("#");
-//     const reg = input.substring(0, pos_reg).split(",");
-//     flexsearch.reg = new Set(reg);
-//
-//     let pos_map = input.indexOf("#", pos_reg + 1);
-//     const map = input.substring(pos_reg + 1, pos_map).split(";").map(res => {
-//         const split = res.split(":");
-//         split[1] = split[1].split("|").map(ids => ids ? ids.split(",") : null);
-//         return split;
-//     });
-//     flexsearch.map = new Map(map);
-//
-//     input = input.substring(pos_map + 1);
-//     if(input){
-//         const ctx = input.split(";").map(res => {
-//             const split = res.split(":");
-//             const context = split[0].split("+");
-//             const map = new Map([
-//                 [context[1], split[1].split("|").map(ids => ids ? ids.split(",") : null)]
-//             ]);
-//             return [context[0], map]
-//         });
-//         flexsearch.ctx = new Map(ctx);
-//     }
-// }
-
 // KeystoreObj.prototype.destroy = function(){
 //     this.index = null;
 //     this.keys = null;
@@ -3450,7 +3483,7 @@ function apply_enrich(res){
 
 function Document(options){
 
-    if(this.constructor !== Document) {
+    if(!this || this.constructor !== Document) {
         return new Document(options);
     }
 
@@ -5430,7 +5463,7 @@ function exclusion(result, limit, offset, resolve){
  */
 
 function Resolver(result){
-    if(this.constructor !== Resolver){
+    if(!this || this.constructor !== Resolver){
         return new Resolver(result);
     }
     if(result && result.index){
@@ -6190,7 +6223,7 @@ function remove_index(map, id){
 
 function Index(options, _register){
 
-    if(this.constructor !== Index){
+    if(!this || this.constructor !== Index){
         return new Index(options);
     }
 
diff --git a/dist/flexsearch.bundle.debug.js b/dist/flexsearch.bundle.debug.js
index 2e90e31..dc9bc3c 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.constructor !== K) {
+  if (!this || 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.constructor !== N) {
+  if (!this || this.constructor !== N) {
     return new N(a);
   }
   let c = "undefined" !== typeof self ? self._factory : "undefined" !== typeof window ? window._factory : null;
@@ -314,37 +314,68 @@ function P(a) {
     return b;
   };
 }
-;function oa(a) {
-  const b = [];
-  for (const c of a.entries()) {
-    b.push(c);
+;function oa(a, b = 0) {
+  let c = [], d = [];
+  b && (b = 250000 / b * 5000 | 0);
+  for (const e of a.entries()) {
+    d.push(e), d.length === b && (c.push(d), d = []);
+  }
+  d.length && c.push(d);
+  return c;
+}
+function pa(a, b) {
+  b || (b = new Map());
+  for (let c = 0, d; c < a.length; c++) {
+    d = a[c], b.set(d[0], d[1]);
   }
   return b;
 }
-function pa(a) {
-  const b = [];
-  for (const c of a.entries()) {
-    b.push(oa(c));
+function qa(a, b = 0) {
+  let c = [], d = [];
+  b && (b = 250000 / b * 1000 | 0);
+  for (const e of a.entries()) {
+    d.push([e[0], oa(e[1])[0]]), d.length === b && (c.push(d), d = []);
+  }
+  d.length && c.push(d);
+  return c;
+}
+function ra(a, b) {
+  b || (b = new Map());
+  for (let c = 0, d, e; c < a.length; c++) {
+    d = a[c], e = b.get(d[0]), b.set(d[0], pa(d[1], e));
   }
   return b;
 }
-function qa(a) {
-  const b = [];
-  for (const c of a.keys()) {
-    b.push(c);
+function sa(a) {
+  let b = [], c = [];
+  for (const d of a.keys()) {
+    c.push(d), 250000 === c.length && (b.push(c), c = []);
+  }
+  c.length && b.push(c);
+  return b;
+}
+function ta(a, b) {
+  b || (b = new Set());
+  for (let c = 0; c < a.length; c++) {
+    b.add(a[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);
+function ua(a, b, c, d, e, f, g = 0) {
+  const h = d && d.constructor === Array;
+  var k = h ? d.shift() : d;
+  if (!k) {
+    return this.export(a, b, e, f + 1);
+  }
+  if ((k = a((b ? b + "." : "") + (g + 1) + "." + c, JSON.stringify(k))) && k.then) {
+    const l = this;
+    return k.then(function() {
+      return ua.call(l, a, b, c, h ? d : null, e, f, g + 1);
     });
   }
-  return this.export(a, b, d, e + 1);
+  return ua.call(this, a, b, c, h ? d : null, e, f, g + 1);
 }
-;function sa(a, b, c, d) {
+;function va(a, b, c, d) {
   let e = [];
   for (let f = 0, g; f < a.index.length; f++) {
     if (g = a.index[f], b >= g.length) {
@@ -410,12 +441,12 @@ function Q(a) {
     }
     if ("slice" === d) {
       return function(e, f) {
-        return sa(b, e || 0, f || b.length, !1);
+        return va(b, e || 0, f || b.length, !1);
       };
     }
     if ("splice" === d) {
       return function(e, f) {
-        return sa(b, e || 0, f || b.length, !0);
+        return va(b, e || 0, f || b.length, !0);
       };
     }
     if ("constructor" === d) {
@@ -446,7 +477,7 @@ function R(a = 8) {
   this.index = B();
   this.B = [];
   this.size = 0;
-  32 < a ? (this.h = ta, this.A = BigInt(a)) : (this.h = ua, this.A = a);
+  32 < a ? (this.h = wa, this.A = BigInt(a)) : (this.h = xa, this.A = a);
 }
 R.prototype.get = function(a) {
   const b = this.index[this.h(a)];
@@ -463,7 +494,7 @@ function S(a = 8) {
   }
   this.index = B();
   this.h = [];
-  32 < a ? (this.B = ta, this.A = BigInt(a)) : (this.B = ua, this.A = a);
+  32 < a ? (this.B = wa, this.A = BigInt(a)) : (this.B = xa, this.A = a);
 }
 S.prototype.add = function(a) {
   var b = this.B(a);
@@ -505,7 +536,7 @@ v.entries = S.prototype.entries = function*() {
     }
   }
 };
-function ua(a) {
+function xa(a) {
   let b = 2 ** this.A - 1;
   if ("number" == typeof a) {
     return a & b;
@@ -516,7 +547,7 @@ function ua(a) {
   }
   return 32 === this.A ? c + 2 ** 31 : c;
 }
-function ta(a) {
+function wa(a) {
   let b = BigInt(2) ** this.A - BigInt(1);
   var c = typeof a;
   if ("bigint" === c) {
@@ -546,7 +577,7 @@ function ta(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]), va(b, k, this.K, 0, d, a, k[0], c);
+          k.constructor === String ? k = ["" + k] : G(k) && (k = [k]), ya(b, k, this.K, 0, d, a, k[0], c);
         }
       }
     }
@@ -609,7 +640,7 @@ function ta(a) {
             h[l] = b[l];
             continue;
           }
-          wa(b, h, l, 0, l[0], m);
+          za(b, h, l, 0, l[0], m);
         }
       }
       this.store.set(a, h || b);
@@ -617,21 +648,21 @@ function ta(a) {
   }
   return this;
 };
-function wa(a, b, c, d, e, f) {
+function za(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++) {
-        wa(a, b, c, d, e);
+        za(a, b, c, d, e);
       }
     } else {
-      b = b[e] || (b[e] = B()), e = c[++d], wa(a, b, c, d, e);
+      b = b[e] || (b[e] = B()), e = c[++d], za(a, b, c, d, e);
     }
   }
 }
-function va(a, b, c, d, e, f, g, h) {
+function ya(a, b, c, d, e, f, g, h) {
   if (a = a[g]) {
     if (d === b.length - 1) {
       if (a.constructor === Array) {
@@ -647,17 +678,17 @@ function va(a, b, c, d, e, f, g, h) {
     } else {
       if (a.constructor === Array) {
         for (g = 0; g < a.length; g++) {
-          va(a, b, c, d, e, f, g, h);
+          ya(a, b, c, d, e, f, g, h);
         }
       } else {
-        g = b[++d], va(a, b, c, d, e, f, g, h);
+        g = b[++d], ya(a, b, c, d, e, f, g, h);
       }
     }
   } else {
     e.db && e.remove(f);
   }
 }
-;function xa(a, b, c, d, e, f, g) {
+;function Aa(a, b, c, d, e, f, g) {
   const h = a.length;
   let k = [], l;
   var m;
@@ -673,7 +704,7 @@ function va(a, b, c, d, e, f, g, h) {
   }
   if (a = k.length) {
     if (e) {
-      k = 1 < k.length ? ya(k, d, c, g, 0) : (k = k[0]).length > c || d ? k.slice(d, c + d) : k;
+      k = 1 < k.length ? Ba(k, d, c, g, 0) : (k = k[0]).length > c || d ? k.slice(d, c + d) : k;
     } else {
       if (a < h) {
         return [];
@@ -706,7 +737,7 @@ function va(a, b, c, d, e, f, g, h) {
   }
   return k;
 }
-function ya(a, b, c, d, e) {
+function Ba(a, b, c, d, e) {
   const f = [], g = B();
   let h;
   var k = a.length;
@@ -749,7 +780,7 @@ function ya(a, b, c, d, e) {
   }
   return f;
 }
-function za(a, b) {
+function Ca(a, b) {
   const c = B(), d = [];
   for (let e = 0, f; e < b.length; e++) {
     f = b[e];
@@ -827,7 +858,7 @@ function za(a, b) {
               }
               t.push(d = d.db.tag(r[n + 1], b, l, q));
             } else {
-              d = Aa.call(this, r[n], r[n + 1], b, l, q);
+              d = Da.call(this, r[n], r[n + 1], b, l, q);
             }
             e.push({field:r[n], tag:r[n + 1], result:d});
           }
@@ -879,7 +910,7 @@ function za(a, b) {
           }
         }
       } else {
-        for (let E = 0, F, fb; E < n.length; E += 2) {
+        for (let E = 0, F, ib; 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) {
@@ -888,7 +919,7 @@ function za(a, b) {
               return e;
             }
           }
-          if (fb = (F = F && F.get(n[E + 1])) && F.length) {
+          if (ib = (F = F && F.get(n[E + 1])) && F.length) {
             x++, u.push(F);
           } else if (!t) {
             return e;
@@ -896,7 +927,7 @@ function za(a, b) {
         }
       }
       if (x) {
-        w = za(w, u);
+        w = Ca(w, u);
         I = w.length;
         if (!I && !t) {
           return e;
@@ -938,7 +969,7 @@ function za(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 = Ba.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 = Ea.call(this, w)));
     if (g) {
       return w;
     }
@@ -950,12 +981,12 @@ function za(a, b) {
       for (let A = 0; A < w.length; A++) {
         e[A].result = w[A];
       }
-      return h ? Ca(e, b) : p ? Da(e, a, y.index, y.field, y.D, p) : e;
+      return h ? Fa(e, b) : p ? Ga(e, a, y.index, y.field, y.D, p) : e;
     });
   }
-  return h ? Ca(e, b) : p ? Da(e, a, this.index, this.field, this.D, p) : e;
+  return h ? Fa(e, b) : p ? Ga(e, a, this.index, this.field, this.D, p) : e;
 };
-function Da(a, b, c, d, e, f) {
+function Ga(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;
@@ -997,7 +1028,7 @@ function Da(a, b, c, d, e, f) {
   }
   return a;
 }
-function Ca(a, b) {
+function Fa(a, b) {
   const c = [], d = B();
   for (let e = 0, f, g; e < a.length; e++) {
     f = a[e];
@@ -1016,7 +1047,7 @@ function Ca(a, b) {
   }
   return c;
 }
-function Aa(a, b, c, d, e) {
+function Da(a, b, c, d, e) {
   let f = this.tag.get(a);
   if (!f) {
     return console.warn("Tag '" + a + "' was not found"), [];
@@ -1025,11 +1056,11 @@ function Aa(a, b, c, d, e) {
     if (a > c || d) {
       f = f.slice(d, d + c);
     }
-    e && (f = Ba.call(this, f));
+    e && (f = Ea.call(this, f));
     return f;
   }
 }
-function Ba(a) {
+function Ea(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)};
@@ -1037,7 +1068,7 @@ function Ba(a) {
   return b;
 }
 ;function T(a) {
-  if (this.constructor !== T) {
+  if (!this || this.constructor !== T) {
     return new T(a);
   }
   const b = a.document || a.doc || a;
@@ -1045,7 +1076,7 @@ function Ba(a) {
   this.D = [];
   this.field = [];
   this.K = [];
-  this.key = (c = b.key || b.id) && Ea(c, this.K) || "id";
+  this.key = (c = b.key || b.id) && Ha(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 && [];
@@ -1053,7 +1084,7 @@ function Ba(a) {
   this.cache = (c = a.cache || null) && new U(c);
   a.cache = !1;
   this.worker = a.worker;
-  this.index = Fa.call(this, a, b);
+  this.index = Ia.call(this, a, b);
   this.tag = null;
   if (c = b.tag) {
     if ("string" === typeof c && (c = [c]), c.length) {
@@ -1066,7 +1097,7 @@ function Ba(a) {
         if (!g) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
-        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));
+        f.custom ? this.G[e] = f.custom : (this.G[e] = Ha(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());
       }
@@ -1134,7 +1165,7 @@ v.destroy = function() {
   }
   return Promise.all(a);
 };
-function Fa(a, b) {
+function Ia(a, b) {
   const c = new Map();
   let d = b.index || b.field || b;
   G(d) && (d = [d]);
@@ -1147,19 +1178,19 @@ function Fa(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] = 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));
+    g.custom ? this.D[e] = g.custom : (this.D[e] = Ha(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] = 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));
+      f = a[e], g = f.field || f, f.custom ? (this.C[e] = f.custom, f.custom.U = g) : (this.C[e] = Ha(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 Ea(a, b) {
+function Ha(a, b) {
   const c = a.split(":");
   let d = 0;
   for (let e = 0; e < c.length; e++) {
@@ -1225,28 +1256,28 @@ v.set = function(a, b) {
   this.store.set(a, b);
   return this;
 };
-v.searchCache = Ga;
+v.searchCache = Ja;
 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);
+        return h.export(a, g, c + 1);
       });
     }
-    return this.export(a, g, c + 1, d = 0);
+    return this.export(a, g, c + 1);
   }
   let e, f;
   switch(d) {
     case 0:
       e = "reg";
-      f = qa(this.reg);
+      f = sa(this.reg);
       b = null;
       break;
     case 1:
       e = "tag";
-      f = pa(this.tag);
+      f = qa(this.tag, this.reg.size);
       b = null;
       break;
     case 2:
@@ -1262,33 +1293,36 @@ v.export = function(a, b, c = 0, d = 0) {
     default:
       return;
   }
-  return ra.call(this, a, b, e, c, d, f);
+  return ua.call(this, a, b, e, f, c, d);
 };
 v.import = function(a, b) {
   if (b) {
-    switch(G(b) && (b = JSON.parse(b)), a) {
-      case "tag":
-        break;
+    G(b) && (b = JSON.parse(b));
+    a = a.split(".");
+    "json" === a[a.length - 1] && a.pop();
+    var c = 2 < a.length ? a[0] : "";
+    a = 2 < a.length ? a[2] : a[1];
+    if (c) {
+      return this.index.get(c).import(a, b);
+    }
+    switch(a) {
       case "reg":
         this.fastupdate = !1;
-        this.reg = new Set(b);
+        this.reg = ta(b, this.reg);
         for (let d = 0, e; d < this.field.length; d++) {
           e = this.index.get(this.field[d]), e.fastupdate = !1, e.reg = this.reg;
         }
         break;
-      case "doc":
-        this.store = new Map(b);
+      case "tag":
+        this.tag = ra(b, this.tag);
         break;
-      default:
-        a = a.split(".");
-        const c = a[0];
-        a = a[1];
-        c && a && this.index.get(c).import(a, b);
+      case "doc":
+        this.store = pa(b, this.store);
     }
   }
 };
 na(T.prototype);
-function Ga(a, b, c) {
+function Ja(a, b, c) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
   let d = this.cache.get(a);
   if (!d) {
@@ -1328,31 +1362,31 @@ U.prototype.clear = function() {
   this.cache.clear();
   this.h = "";
 };
-const Ha = {normalize:function(a) {
+const Ka = {normalize:function(a) {
   return a.toLowerCase();
 }, dedupe:!1};
-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) {
+const La = 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 Ma = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), Na = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
+const Oa = {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 Pa = /[\x00-\x7F]+/g;
+const Qa = /[\x00-\x7F]+/g;
+const Ra = /[\x00-\x7F]+/g;
+var Sa = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:Ka, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:La}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:La, matcher:Ma, replacer:Na}, LatinExtra:{normalize:!0, dedupe:!0, mapper:La, replacer:Na.concat([/(?!^)[aeo]/g, ""]), matcher:Ma}, 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 = 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++) {
+    let d = b.charAt(0), e = Oa[d];
+    for (let f = 1, g; f < b.length && (g = b.charAt(f), "h" === g || "w" === g || !(g = Oa[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(Ma, " ");
+  return ("" + a).replace(Pa, " ");
 }}, CjkDefault:{normalize:!1, dedupe:!0, split:"", prepare:function(a) {
-  return ("" + a).replace(Na, "");
+  return ("" + a).replace(Qa, "");
 }}, CyrillicDefault:{normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(Oa, " ");
+  return ("" + a).replace(Ra, " ");
 }}};
-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}}};
+const Ta = {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)) {
@@ -1366,14 +1400,14 @@ 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) : Ra(n, d, q), g = "";
+          var f = this.score ? this.score(b, t, q, null, 0) : Ua(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) : Ra(n, d, q, e, f);
+                    var k = this.score ? this.score(b, t, q, g, f) : Ua(n, d, q, e, f);
                     V(this, m, g, k, a, c);
                   }
                 }
@@ -1382,7 +1416,7 @@ 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) : Ra(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) : Ua(n, d, q, e, h), V(this, m, g, k, a, c);
                 }
                 g = "";
               }
@@ -1398,7 +1432,7 @@ 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) : Ra(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) : Ua(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);
                   }
                 }
@@ -1411,7 +1445,7 @@ L.prototype.add = function(a, b, c, d) {
       b = "";
     }
   }
-  this.db && (b || this.commit_task.push({del:a}), this.T && Sa(this));
+  this.db && (b || this.commit_task.push({del:a}), this.T && Va(this));
   return this;
 };
 function V(a, b, c, d, e, f, g) {
@@ -1432,12 +1466,12 @@ function V(a, b, c, d, e, f, g) {
     }
   }
 }
-function Ra(a, b, c, d, e) {
+function Ua(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 ? Ta(a) : a;
+    return a = a[0], a = c || a.length > b ? b ? a.slice(c, c + b) : a.slice(c) : a, d ? Wa(a) : a;
   }
   let e = [];
   for (let f = 0, g, h; f < a.length; f++) {
@@ -1453,7 +1487,7 @@ function Ra(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 ? Ta(g) : g;
+          return h > b && (g = g.slice(0, b)), d ? Wa(g) : g;
         }
         e = [g];
       }
@@ -1467,9 +1501,9 @@ function Ra(a, b, c, d, e) {
     return e;
   }
   e = 1 < e.length ? [].concat.apply([], e) : e[0];
-  return d ? Ta(e) : e;
+  return d ? Wa(e) : e;
 }
-function Ta(a) {
+function Wa(a) {
   for (let b = 0; b < a.length; b++) {
     a[b] = {score:b, id:a[b]};
   }
@@ -1519,19 +1553,19 @@ function Ta(a) {
   if (c.length) {
     return Promise.all(c).then(function() {
       a.result.length && (d = d.concat([a.result]));
-      a.result = Ua(d, e, f, g, h, a.F);
+      a.result = Xa(d, e, f, g, h, a.F);
       return h ? a.result : a;
     });
   }
-  d.length && (this.result.length && (d = d.concat([this.result])), this.result = Ua(d, e, f, g, h, this.F));
+  d.length && (this.result.length && (d = d.concat([this.result])), this.result = Xa(d, e, f, g, h, this.F));
   return h ? this.result : this;
 };
-function Ua(a, b, c, d, e, f) {
+function Xa(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] : ya(a, c, b, e, f);
+  return 2 > a.length ? e ? W(a[0], b, c, d) : a[0] : Ba(a, c, b, e, f);
 }
 ;X.prototype.and = function() {
   if (this.result.length) {
@@ -1581,24 +1615,24 @@ function Ua(a, b, c, d, e, f) {
     if (a.length) {
       return Promise.all(a).then(function() {
         d = [b.result].concat(d);
-        b.result = Va(d, e, f, g, b.F, h);
+        b.result = Ya(d, e, f, g, b.F, h);
         return g ? b.result : b;
       });
     }
     d = [this.result].concat(d);
-    this.result = Va(d, e, f, g, this.F, h);
+    this.result = Ya(d, e, f, g, this.F, h);
     return g ? this.result : this;
   }
   return this;
 };
-function Va(a, b, c, d, e, f) {
+function Ya(a, b, c, d, e, f) {
   if (2 > a.length) {
     return [];
   }
   let g = [];
   B();
   let h = ca(a);
-  return h ? xa(a, h, b, c, f, e, d) : g;
+  return h ? Aa(a, h, b, c, f, e, d) : g;
 }
 ;X.prototype.xor = function() {
   const a = this;
@@ -1644,14 +1678,14 @@ function Va(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 = Wa(d, e, f, g, !h, a.F);
+      a.result = Za(d, e, f, g, !h, a.F);
       return h ? a.result : a;
     });
   }
-  d.length && (this.result.length && (d = [this.result].concat(d)), this.result = Wa(d, e, f, g, !h, a.F));
+  d.length && (this.result.length && (d = [this.result].concat(d)), this.result = Za(d, e, f, g, !h, a.F));
   return h ? this.result : this;
 };
-function Wa(a, b, c, d, e, f) {
+function Za(a, b, c, d, e, f) {
   if (!a.length) {
     return a;
   }
@@ -1745,14 +1779,14 @@ function Wa(a, b, c, d, e, f) {
   }
   if (c.length) {
     return Promise.all(c).then(function() {
-      a.result = Xa.call(a, d, e, f, g);
+      a.result = $a.call(a, d, e, f, g);
       return g ? a.result : a;
     });
   }
-  d.length && (this.result = Xa.call(this, d, e, f, g));
+  d.length && (this.result = $a.call(this, d, e, f, g));
   return g ? this.result : this;
 };
-function Xa(a, b, c, d) {
+function $a(a, b, c, d) {
   if (!a.length) {
     return this.result;
   }
@@ -1782,7 +1816,7 @@ function Xa(a, b, c, d) {
   return e;
 }
 ;function X(a) {
-  if (this.constructor !== X) {
+  if (!this || this.constructor !== X) {
     return new X(a);
   }
   if (a && a.index) {
@@ -1827,12 +1861,12 @@ X.prototype.boost = function(a) {
   return this;
 };
 X.prototype.resolve = function(a, b, c) {
-  Ya = 1;
+  ab = 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 Ya = 1;
+let ab = 1;
 L.prototype.search = function(a, b, c) {
   c || (!b && H(a) ? (c = a, a = "") : H(b) && (c = b, b = 0));
   let d = [], e;
@@ -1843,22 +1877,22 @@ L.prototype.search = function(a, b, c) {
     g = c.offset || 0;
     var p = c.context;
     f = c.suggest;
-    (h = Ya && !1 !== c.resolve) || (Ya = 0);
+    (h = ab && !1 !== c.resolve) || (ab = 0);
     k = h && c.enrich;
     m = c.boost;
     l = this.db && c.tag;
   } else {
-    h = this.resolve || Ya;
+    h = this.resolve || ab;
   }
   a = this.encoder.encode(a);
   e = a.length;
   b || !h || (b = 100);
   if (1 === e) {
-    return Za.call(this, a[0], "", b, g, h, k, l);
+    return bb.call(this, a[0], "", b, g, h, k, l);
   }
   p = this.depth && !1 !== p;
   if (2 === e && p && !f) {
-    return Za.call(this, a[0], a[1], b, g, h, k, l);
+    return bb.call(this, a[0], a[1], b, g, h, k, l);
   }
   let n = c = 0;
   if (1 < e) {
@@ -1883,10 +1917,10 @@ L.prototype.search = function(a, b, c) {
   }
   let q = 0, t;
   if (1 === e) {
-    return Za.call(this, a[0], "", b, g, h, k, l);
+    return bb.call(this, a[0], "", b, g, h, k, l);
   }
   if (2 === e && p && !f) {
-    return Za.call(this, a[0], a[1], b, g, h, k, l);
+    return bb.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) {
@@ -1897,7 +1931,7 @@ 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 = $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));
+        t ? (u = await Y(r, x, t, 0, 0, !1, !1), u = cb(u, d, f, r.R), f && !1 === u && d.length || (t = x)) : (u = await Y(r, x, "", 0, 0, !1, !1), u = cb(u, d, f, r.resolution));
         if (u) {
           return u;
         }
@@ -1916,12 +1950,12 @@ L.prototype.search = function(a, b, c) {
           }
         }
       }
-      return h ? xa(d, r.resolution, b, g, f, m, h) : new X(d[0]);
+      return h ? Aa(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 = $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));
+    t ? (r = Y(this, u, t, 0, 0, !1, !1), r = cb(r, d, f, this.R), f && !1 === r && d.length || (t = u)) : (r = Y(this, u, "", 0, 0, !1, !1), r = cb(r, d, f, this.resolution));
     if (r) {
       return r;
     }
@@ -1940,16 +1974,16 @@ L.prototype.search = function(a, b, c) {
       }
     }
   }
-  d = xa(d, this.resolution, b, g, f, m, h);
+  d = Aa(d, this.resolution, b, g, f, m, h);
   return h ? d : new X(d);
 };
-function Za(a, b, c, d, e, f, g) {
+function bb(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 $a(a, b, c, d) {
+function cb(a, b, c, d) {
   let e = [];
   if (a) {
     d = Math.min(a.length, d);
@@ -1987,15 +2021,15 @@ function Y(a, b, c, d, e, f, g, h) {
         }
       }
     } else {
-      ab(this.map, a), this.depth && ab(this.ctx, a);
+      db(this.map, a), this.depth && db(this.ctx, a);
     }
     b || this.reg.delete(a);
   }
-  this.db && (this.commit_task.push({del:a}), this.T && Sa(this));
+  this.db && (this.commit_task.push({del:a}), this.T && Va(this));
   this.cache && this.cache.remove(a);
   return this;
 };
-function ab(a, b) {
+function db(a, b) {
   let c = 0;
   if (a.constructor === Array) {
     for (let d = 0, e, f; d < a.length; d++) {
@@ -2010,24 +2044,24 @@ function ab(a, b) {
     }
   } else {
     for (let d of a) {
-      const e = d[0], f = ab(d[1], b);
+      const e = d[0], f = db(d[1], b);
       f ? c += f : a.delete(e);
     }
   }
   return c;
 }
 ;function L(a, b) {
-  if (this.constructor !== L) {
+  if (!this || this.constructor !== L) {
     return new L(a);
   }
   if (a) {
     var c = G(a) ? a : a.preset;
-    c && (Qa[c] || console.warn("Preset not found: " + c), a = Object.assign({}, Qa[c], a));
+    c && (Ta[c] || console.warn("Preset not found: " + c), a = Object.assign({}, Ta[c], a));
   } else {
     a = {};
   }
   c = a.context || {};
-  const d = G(a.encoder) ? Pa[a.encoder] : a.encode || a.encoder || Ha;
+  const d = G(a.encoder) ? Sa[a.encoder] : a.encode || a.encoder || Ka;
   this.encoder = d.encode ? d : "object" === typeof d ? new K(d) : {encode:d};
   let e;
   this.resolution = a.resolution || 9;
@@ -2064,7 +2098,7 @@ v.destroy = function() {
   this.commit_timer && (clearTimeout(this.commit_timer), this.commit_timer = null);
   return this.db.destroy();
 };
-function Sa(a) {
+function Va(a) {
   a.commit_timer || (a.commit_timer = setTimeout(function() {
     a.commit_timer = null;
     a.db.commit(a, void 0, void 0);
@@ -2088,7 +2122,7 @@ 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 bb(a) {
+function eb(a) {
   let b = 0;
   if (a.constructor === Array) {
     for (let c = 0, d; c < a.length; c++) {
@@ -2096,7 +2130,7 @@ function bb(a) {
     }
   } else {
     for (const c of a) {
-      const d = c[0], e = bb(c[1]);
+      const d = c[0], e = eb(c[1]);
       e ? b += e : a.delete(d);
     }
   }
@@ -2106,17 +2140,17 @@ v.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
-  bb(this.map);
-  this.depth && bb(this.ctx);
+  eb(this.map);
+  this.depth && eb(this.ctx);
   return this;
 };
-v.searchCache = Ga;
+v.searchCache = Ja;
 v.export = function(a, b, c, d = 0) {
   let e, f;
   switch(d) {
     case 0:
       e = "reg";
-      f = qa(this.reg);
+      f = sa(this.reg);
       break;
     case 1:
       e = "cfg";
@@ -2124,29 +2158,29 @@ v.export = function(a, b, c, d = 0) {
       break;
     case 2:
       e = "map";
-      f = oa(this.map);
+      f = oa(this.map, this.reg.size);
       break;
     case 3:
       e = "ctx";
-      f = pa(this.ctx);
+      f = qa(this.ctx, this.reg.size);
       break;
     default:
       return;
   }
-  return ra.call(this, a, b, e, c, d, f);
+  return ua.call(this, a, b, e, f, c, d);
 };
 v.import = function(a, b) {
   if (b) {
-    switch(G(b) && (b = JSON.parse(b)), a) {
+    switch(G(b) && (b = JSON.parse(b)), a = a.split("."), "json" === a[a.length - 1] && a.pop(), a = 1 < a.length ? a[1] : a[0], a) {
       case "reg":
         this.fastupdate = !1;
-        this.reg = new Set(b);
+        this.reg = ta(b, this.reg);
         break;
       case "map":
-        this.map = new Map(b);
+        this.map = pa(b, this.map);
         break;
       case "ctx":
-        this.ctx = new Map(b);
+        this.ctx = ra(b, this.ctx);
     }
   }
 };
@@ -2201,10 +2235,10 @@ v.serialize = function(a = !0) {
   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 eb(a, b = {}) {
+const fb = "undefined" !== typeof window && (window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB), gb = ["map", "ctx", "tag", "reg", "cfg"];
+function hb(a, b = {}) {
   if (!this) {
-    return new eb(a, b);
+    return new hb(a, b);
   }
   "object" === typeof a && (b = a = a.name);
   a || console.info("Default storage space was used, because a name was not passed.");
@@ -2214,7 +2248,7 @@ function eb(a, b = {}) {
   this.db = null;
   this.h = {};
 }
-v = eb.prototype;
+v = hb.prototype;
 v.mount = function(a) {
   if (!a.encoder) {
     return a.mount(this);
@@ -2226,10 +2260,10 @@ 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);
+    const d = fb.open(a.id + (a.field ? ":" + a.field : ""), 1);
     d.onupgradeneeded = function() {
       const e = a.db = this.result;
-      db.forEach(f => {
+      gb.forEach(f => {
         e.objectStoreNames.contains(f) || e.createObjectStore(f);
       });
     };
@@ -2255,12 +2289,12 @@ v.close = function() {
   this.db = null;
 };
 v.destroy = function() {
-  return cb.deleteDatabase(this.id + (this.field ? ":" + this.field : ""));
+  return fb.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();
+  const a = this.db.transaction(gb, "readwrite");
+  for (let b = 0; b < gb.length; b++) {
+    a.objectStore(gb[b]).clear();
   }
   return Z(a);
 };
@@ -2444,7 +2478,7 @@ 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 gb(a, b, c) {
+function jb(a, b, c) {
   const d = a.value;
   let e, f, g = 0;
   for (let h = 0, k; h < d.length; h++) {
@@ -2473,17 +2507,17 @@ v.remove = function(a) {
   return Promise.all([this.transaction("map", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       const c = this.result;
-      c && gb(c, a);
+      c && jb(c, a);
     };
   }), this.transaction("ctx", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       const c = this.result;
-      c && gb(c, a);
+      c && jb(c, a);
     };
   }), this.transaction("tag", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       const c = this.result;
-      c && gb(c, a, !0);
+      c && jb(c, a, !0);
     };
   }), this.transaction("reg", "readwrite", function(b) {
     for (let c = 0; c < a.length; c++) {
@@ -2503,9 +2537,9 @@ function Z(a) {
     a = null;
   });
 }
-;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;
+;const kb = {Index:L, Charset:Sa, Encoder:K, Document:T, Worker:N, Resolver:X, IndexedDB:hb, Language:{}}, lb = self;
+let mb;
+(mb = lb.define) && mb.amd ? mb([], function() {
+  return kb;
+}) : "object" === typeof lb.exports ? lb.exports = kb : lb.FlexSearch = kb;
 }(this||self));
diff --git a/dist/flexsearch.bundle.min.js b/dist/flexsearch.bundle.min.js
index 0264a58..6a5ee0e 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",
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+function eb(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=eb(c[1]);e?b+=e:a.delete(d)}return b}v.cleanup=function(){if(!this.fastupdate)return this;eb(this.map);this.depth&&eb(this.ctx);return this};v.searchCache=Ja;
+v.export=function(a,b,c,d=0){let e,f;switch(d){case 0:e="reg";f=sa(this.reg);break;case 1:e="cfg";f={};break;case 2:e="map";f=oa(this.map,this.reg.size);break;case 3:e="ctx";f=qa(this.ctx,this.reg.size);break;default:return}return ua.call(this,a,b,e,f,c,d)};
+v.import=function(a,b){if(b)switch(F(b)&&(b=JSON.parse(b)),a=a.split("."),"json"===a[a.length-1]&&a.pop(),a=1<a.length?a[1]:a[0],a){case "reg":this.fastupdate=!1;this.reg=ta(b,this.reg);break;case "map":this.map=pa(b,this.map);break;case "ctx":this.ctx=ra(b,this.ctx)}};
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-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)};
+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 fb="undefined"!==typeof window&&(window.indexedDB||window.mozIndexedDB||window.webkitIndexedDB||window.msIndexedDB),gb=["map","ctx","tag","reg","cfg"];
+function ib(a,b={}){if(!this)return new ib(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=ib.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=fb.open(a.id+(a.field?":"+a.field:""),1);d.onupgradeneeded=function(){const e=a.db=this.result;gb.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 fb.deleteDatabase(this.id+(this.field?":"+this.field:""))};v.clear=function(){const a=this.db.transaction(gb,"readwrite");for(let b=0;b<gb.length;b++)a.objectStore(gb[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 +97,6 @@ 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 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));
+function jb(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&&jb(c,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&jb(c,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&jb(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 kb={Index:L,Charset:Sa,Encoder:K,Document:T,Worker:N,Resolver:X,IndexedDB:ib,Language:{}},lb=self;let mb;(mb=lb.define)&&mb.amd?mb([],function(){return kb}):"object"===typeof lb.exports?lb.exports=kb:lb.FlexSearch=kb;}(this||self));
diff --git a/dist/flexsearch.bundle.module.debug.js b/dist/flexsearch.bundle.module.debug.js
index a170ce0..2143567 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.constructor !== K) {
+  if (!this || 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.constructor !== N) {
+  if (!this || this.constructor !== N) {
     return new N(a);
   }
   let c = "undefined" !== typeof self ? self._factory : "undefined" !== typeof window ? window._factory : null;
@@ -313,37 +313,68 @@ function P(a) {
     return b;
   };
 }
-;function oa(a) {
-  const b = [];
-  for (const c of a.entries()) {
-    b.push(c);
+;function oa(a, b = 0) {
+  let c = [], d = [];
+  b && (b = 250000 / b * 5000 | 0);
+  for (const e of a.entries()) {
+    d.push(e), d.length === b && (c.push(d), d = []);
+  }
+  d.length && c.push(d);
+  return c;
+}
+function pa(a, b) {
+  b || (b = new Map());
+  for (let c = 0, d; c < a.length; c++) {
+    d = a[c], b.set(d[0], d[1]);
   }
   return b;
 }
-function pa(a) {
-  const b = [];
-  for (const c of a.entries()) {
-    b.push(oa(c));
+function qa(a, b = 0) {
+  let c = [], d = [];
+  b && (b = 250000 / b * 1000 | 0);
+  for (const e of a.entries()) {
+    d.push([e[0], oa(e[1])[0]]), d.length === b && (c.push(d), d = []);
+  }
+  d.length && c.push(d);
+  return c;
+}
+function ra(a, b) {
+  b || (b = new Map());
+  for (let c = 0, d, e; c < a.length; c++) {
+    d = a[c], e = b.get(d[0]), b.set(d[0], pa(d[1], e));
   }
   return b;
 }
-function qa(a) {
-  const b = [];
-  for (const c of a.keys()) {
-    b.push(c);
+function sa(a) {
+  let b = [], c = [];
+  for (const d of a.keys()) {
+    c.push(d), 250000 === c.length && (b.push(c), c = []);
+  }
+  c.length && b.push(c);
+  return b;
+}
+function ta(a, b) {
+  b || (b = new Set());
+  for (let c = 0; c < a.length; c++) {
+    b.add(a[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);
+function ua(a, b, c, d, e, f, g = 0) {
+  const h = d && d.constructor === Array;
+  var k = h ? d.shift() : d;
+  if (!k) {
+    return this.export(a, b, e, f + 1);
+  }
+  if ((k = a((b ? b + "." : "") + (g + 1) + "." + c, JSON.stringify(k))) && k.then) {
+    const l = this;
+    return k.then(function() {
+      return ua.call(l, a, b, c, h ? d : null, e, f, g + 1);
     });
   }
-  return this.export(a, b, d, e + 1);
+  return ua.call(this, a, b, c, h ? d : null, e, f, g + 1);
 }
-;function sa(a, b, c, d) {
+;function va(a, b, c, d) {
   let e = [];
   for (let f = 0, g; f < a.index.length; f++) {
     if (g = a.index[f], b >= g.length) {
@@ -409,12 +440,12 @@ function Q(a) {
     }
     if ("slice" === d) {
       return function(e, f) {
-        return sa(b, e || 0, f || b.length, !1);
+        return va(b, e || 0, f || b.length, !1);
       };
     }
     if ("splice" === d) {
       return function(e, f) {
-        return sa(b, e || 0, f || b.length, !0);
+        return va(b, e || 0, f || b.length, !0);
       };
     }
     if ("constructor" === d) {
@@ -445,7 +476,7 @@ function R(a = 8) {
   this.index = B();
   this.B = [];
   this.size = 0;
-  32 < a ? (this.h = ta, this.A = BigInt(a)) : (this.h = ua, this.A = a);
+  32 < a ? (this.h = wa, this.A = BigInt(a)) : (this.h = xa, this.A = a);
 }
 R.prototype.get = function(a) {
   const b = this.index[this.h(a)];
@@ -462,7 +493,7 @@ function S(a = 8) {
   }
   this.index = B();
   this.h = [];
-  32 < a ? (this.B = ta, this.A = BigInt(a)) : (this.B = ua, this.A = a);
+  32 < a ? (this.B = wa, this.A = BigInt(a)) : (this.B = xa, this.A = a);
 }
 S.prototype.add = function(a) {
   var b = this.B(a);
@@ -504,7 +535,7 @@ v.entries = S.prototype.entries = function*() {
     }
   }
 };
-function ua(a) {
+function xa(a) {
   let b = 2 ** this.A - 1;
   if ("number" == typeof a) {
     return a & b;
@@ -515,7 +546,7 @@ function ua(a) {
   }
   return 32 === this.A ? c + 2 ** 31 : c;
 }
-function ta(a) {
+function wa(a) {
   let b = BigInt(2) ** this.A - BigInt(1);
   var c = typeof a;
   if ("bigint" === c) {
@@ -545,7 +576,7 @@ function ta(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]), va(b, k, this.K, 0, d, a, k[0], c);
+          k.constructor === String ? k = ["" + k] : G(k) && (k = [k]), ya(b, k, this.K, 0, d, a, k[0], c);
         }
       }
     }
@@ -608,7 +639,7 @@ function ta(a) {
             h[l] = b[l];
             continue;
           }
-          wa(b, h, l, 0, l[0], m);
+          za(b, h, l, 0, l[0], m);
         }
       }
       this.store.set(a, h || b);
@@ -616,21 +647,21 @@ function ta(a) {
   }
   return this;
 };
-function wa(a, b, c, d, e, f) {
+function za(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++) {
-        wa(a, b, c, d, e);
+        za(a, b, c, d, e);
       }
     } else {
-      b = b[e] || (b[e] = B()), e = c[++d], wa(a, b, c, d, e);
+      b = b[e] || (b[e] = B()), e = c[++d], za(a, b, c, d, e);
     }
   }
 }
-function va(a, b, c, d, e, f, g, h) {
+function ya(a, b, c, d, e, f, g, h) {
   if (a = a[g]) {
     if (d === b.length - 1) {
       if (a.constructor === Array) {
@@ -646,17 +677,17 @@ function va(a, b, c, d, e, f, g, h) {
     } else {
       if (a.constructor === Array) {
         for (g = 0; g < a.length; g++) {
-          va(a, b, c, d, e, f, g, h);
+          ya(a, b, c, d, e, f, g, h);
         }
       } else {
-        g = b[++d], va(a, b, c, d, e, f, g, h);
+        g = b[++d], ya(a, b, c, d, e, f, g, h);
       }
     }
   } else {
     e.db && e.remove(f);
   }
 }
-;function xa(a, b, c, d, e, f, g) {
+;function Aa(a, b, c, d, e, f, g) {
   const h = a.length;
   let k = [], l;
   var m;
@@ -672,7 +703,7 @@ function va(a, b, c, d, e, f, g, h) {
   }
   if (a = k.length) {
     if (e) {
-      k = 1 < k.length ? ya(k, d, c, g, 0) : (k = k[0]).length > c || d ? k.slice(d, c + d) : k;
+      k = 1 < k.length ? Ba(k, d, c, g, 0) : (k = k[0]).length > c || d ? k.slice(d, c + d) : k;
     } else {
       if (a < h) {
         return [];
@@ -705,7 +736,7 @@ function va(a, b, c, d, e, f, g, h) {
   }
   return k;
 }
-function ya(a, b, c, d, e) {
+function Ba(a, b, c, d, e) {
   const f = [], g = B();
   let h;
   var k = a.length;
@@ -748,7 +779,7 @@ function ya(a, b, c, d, e) {
   }
   return f;
 }
-function za(a, b) {
+function Ca(a, b) {
   const c = B(), d = [];
   for (let e = 0, f; e < b.length; e++) {
     f = b[e];
@@ -826,7 +857,7 @@ function za(a, b) {
               }
               t.push(d = d.db.tag(r[n + 1], b, l, q));
             } else {
-              d = Aa.call(this, r[n], r[n + 1], b, l, q);
+              d = Da.call(this, r[n], r[n + 1], b, l, q);
             }
             e.push({field:r[n], tag:r[n + 1], result:d});
           }
@@ -878,7 +909,7 @@ function za(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) {
@@ -887,7 +918,7 @@ function za(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;
@@ -895,7 +926,7 @@ function za(a, b) {
         }
       }
       if (x) {
-        w = za(w, u);
+        w = Ca(w, u);
         I = w.length;
         if (!I && !t) {
           return e;
@@ -937,7 +968,7 @@ function za(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 = Ba.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 = Ea.call(this, w)));
     if (g) {
       return w;
     }
@@ -949,12 +980,12 @@ function za(a, b) {
       for (let A = 0; A < w.length; A++) {
         e[A].result = w[A];
       }
-      return h ? Ca(e, b) : p ? Da(e, a, y.index, y.field, y.D, p) : e;
+      return h ? Fa(e, b) : p ? Ga(e, a, y.index, y.field, y.D, p) : e;
     });
   }
-  return h ? Ca(e, b) : p ? Da(e, a, this.index, this.field, this.D, p) : e;
+  return h ? Fa(e, b) : p ? Ga(e, a, this.index, this.field, this.D, p) : e;
 };
-function Da(a, b, c, d, e, f) {
+function Ga(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;
@@ -996,7 +1027,7 @@ function Da(a, b, c, d, e, f) {
   }
   return a;
 }
-function Ca(a, b) {
+function Fa(a, b) {
   const c = [], d = B();
   for (let e = 0, f, g; e < a.length; e++) {
     f = a[e];
@@ -1015,7 +1046,7 @@ function Ca(a, b) {
   }
   return c;
 }
-function Aa(a, b, c, d, e) {
+function Da(a, b, c, d, e) {
   let f = this.tag.get(a);
   if (!f) {
     return console.warn("Tag '" + a + "' was not found"), [];
@@ -1024,11 +1055,11 @@ function Aa(a, b, c, d, e) {
     if (a > c || d) {
       f = f.slice(d, d + c);
     }
-    e && (f = Ba.call(this, f));
+    e && (f = Ea.call(this, f));
     return f;
   }
 }
-function Ba(a) {
+function Ea(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)};
@@ -1036,7 +1067,7 @@ function Ba(a) {
   return b;
 }
 ;function T(a) {
-  if (this.constructor !== T) {
+  if (!this || this.constructor !== T) {
     return new T(a);
   }
   const b = a.document || a.doc || a;
@@ -1044,7 +1075,7 @@ function Ba(a) {
   this.D = [];
   this.field = [];
   this.K = [];
-  this.key = (c = b.key || b.id) && Ea(c, this.K) || "id";
+  this.key = (c = b.key || b.id) && Ha(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 && [];
@@ -1052,7 +1083,7 @@ function Ba(a) {
   this.cache = (c = a.cache || null) && new U(c);
   a.cache = !1;
   this.worker = a.worker;
-  this.index = Fa.call(this, a, b);
+  this.index = Ia.call(this, a, b);
   this.tag = null;
   if (c = b.tag) {
     if ("string" === typeof c && (c = [c]), c.length) {
@@ -1065,7 +1096,7 @@ function Ba(a) {
         if (!g) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
-        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));
+        f.custom ? this.G[e] = f.custom : (this.G[e] = Ha(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());
       }
@@ -1133,7 +1164,7 @@ v.destroy = function() {
   }
   return Promise.all(a);
 };
-function Fa(a, b) {
+function Ia(a, b) {
   const c = new Map();
   let d = b.index || b.field || b;
   G(d) && (d = [d]);
@@ -1146,19 +1177,19 @@ function Fa(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] = 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));
+    g.custom ? this.D[e] = g.custom : (this.D[e] = Ha(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] = 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));
+      f = a[e], g = f.field || f, f.custom ? (this.C[e] = f.custom, f.custom.U = g) : (this.C[e] = Ha(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 Ea(a, b) {
+function Ha(a, b) {
   const c = a.split(":");
   let d = 0;
   for (let e = 0; e < c.length; e++) {
@@ -1224,28 +1255,28 @@ v.set = function(a, b) {
   this.store.set(a, b);
   return this;
 };
-v.searchCache = Ga;
+v.searchCache = Ja;
 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);
+        return h.export(a, g, c + 1);
       });
     }
-    return this.export(a, g, c + 1, d = 0);
+    return this.export(a, g, c + 1);
   }
   let e, f;
   switch(d) {
     case 0:
       e = "reg";
-      f = qa(this.reg);
+      f = sa(this.reg);
       b = null;
       break;
     case 1:
       e = "tag";
-      f = pa(this.tag);
+      f = qa(this.tag, this.reg.size);
       b = null;
       break;
     case 2:
@@ -1261,33 +1292,36 @@ v.export = function(a, b, c = 0, d = 0) {
     default:
       return;
   }
-  return ra.call(this, a, b, e, c, d, f);
+  return ua.call(this, a, b, e, f, c, d);
 };
 v.import = function(a, b) {
   if (b) {
-    switch(G(b) && (b = JSON.parse(b)), a) {
-      case "tag":
-        break;
+    G(b) && (b = JSON.parse(b));
+    a = a.split(".");
+    "json" === a[a.length - 1] && a.pop();
+    var c = 2 < a.length ? a[0] : "";
+    a = 2 < a.length ? a[2] : a[1];
+    if (c) {
+      return this.index.get(c).import(a, b);
+    }
+    switch(a) {
       case "reg":
         this.fastupdate = !1;
-        this.reg = new Set(b);
+        this.reg = ta(b, this.reg);
         for (let d = 0, e; d < this.field.length; d++) {
           e = this.index.get(this.field[d]), e.fastupdate = !1, e.reg = this.reg;
         }
         break;
-      case "doc":
-        this.store = new Map(b);
+      case "tag":
+        this.tag = ra(b, this.tag);
         break;
-      default:
-        a = a.split(".");
-        const c = a[0];
-        a = a[1];
-        c && a && this.index.get(c).import(a, b);
+      case "doc":
+        this.store = pa(b, this.store);
     }
   }
 };
 na(T.prototype);
-function Ga(a, b, c) {
+function Ja(a, b, c) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
   let d = this.cache.get(a);
   if (!d) {
@@ -1327,31 +1361,31 @@ U.prototype.clear = function() {
   this.cache.clear();
   this.h = "";
 };
-const Ha = {normalize:function(a) {
+const Ka = {normalize:function(a) {
   return a.toLowerCase();
 }, dedupe:!1};
-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) {
+const La = 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 Ma = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), Na = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
+const Oa = {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 Pa = /[\x00-\x7F]+/g;
+const Qa = /[\x00-\x7F]+/g;
+const Ra = /[\x00-\x7F]+/g;
+var Sa = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:Ka, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:La}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:La, matcher:Ma, replacer:Na}, LatinExtra:{normalize:!0, dedupe:!0, mapper:La, replacer:Na.concat([/(?!^)[aeo]/g, ""]), matcher:Ma}, 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 = 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++) {
+    let d = b.charAt(0), e = Oa[d];
+    for (let f = 1, g; f < b.length && (g = b.charAt(f), "h" === g || "w" === g || !(g = Oa[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(Ma, " ");
+  return ("" + a).replace(Pa, " ");
 }}, CjkDefault:{normalize:!1, dedupe:!0, split:"", prepare:function(a) {
-  return ("" + a).replace(Na, "");
+  return ("" + a).replace(Qa, "");
 }}, CyrillicDefault:{normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(Oa, " ");
+  return ("" + a).replace(Ra, " ");
 }}};
-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}}};
+const Ta = {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)) {
@@ -1365,14 +1399,14 @@ 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) : Ra(n, d, q), g = "";
+          var f = this.score ? this.score(b, t, q, null, 0) : Ua(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) : Ra(n, d, q, e, f);
+                    var k = this.score ? this.score(b, t, q, g, f) : Ua(n, d, q, e, f);
                     V(this, m, g, k, a, c);
                   }
                 }
@@ -1381,7 +1415,7 @@ 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) : Ra(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) : Ua(n, d, q, e, h), V(this, m, g, k, a, c);
                 }
                 g = "";
               }
@@ -1397,7 +1431,7 @@ 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) : Ra(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) : Ua(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);
                   }
                 }
@@ -1410,7 +1444,7 @@ L.prototype.add = function(a, b, c, d) {
       b = "";
     }
   }
-  this.db && (b || this.commit_task.push({del:a}), this.T && Sa(this));
+  this.db && (b || this.commit_task.push({del:a}), this.T && Va(this));
   return this;
 };
 function V(a, b, c, d, e, f, g) {
@@ -1431,12 +1465,12 @@ function V(a, b, c, d, e, f, g) {
     }
   }
 }
-function Ra(a, b, c, d, e) {
+function Ua(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 ? Ta(a) : a;
+    return a = a[0], a = c || a.length > b ? b ? a.slice(c, c + b) : a.slice(c) : a, d ? Wa(a) : a;
   }
   let e = [];
   for (let f = 0, g, h; f < a.length; f++) {
@@ -1452,7 +1486,7 @@ function Ra(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 ? Ta(g) : g;
+          return h > b && (g = g.slice(0, b)), d ? Wa(g) : g;
         }
         e = [g];
       }
@@ -1466,9 +1500,9 @@ function Ra(a, b, c, d, e) {
     return e;
   }
   e = 1 < e.length ? [].concat.apply([], e) : e[0];
-  return d ? Ta(e) : e;
+  return d ? Wa(e) : e;
 }
-function Ta(a) {
+function Wa(a) {
   for (let b = 0; b < a.length; b++) {
     a[b] = {score:b, id:a[b]};
   }
@@ -1518,19 +1552,19 @@ function Ta(a) {
   if (c.length) {
     return Promise.all(c).then(function() {
       a.result.length && (d = d.concat([a.result]));
-      a.result = Ua(d, e, f, g, h, a.F);
+      a.result = Xa(d, e, f, g, h, a.F);
       return h ? a.result : a;
     });
   }
-  d.length && (this.result.length && (d = d.concat([this.result])), this.result = Ua(d, e, f, g, h, this.F));
+  d.length && (this.result.length && (d = d.concat([this.result])), this.result = Xa(d, e, f, g, h, this.F));
   return h ? this.result : this;
 };
-function Ua(a, b, c, d, e, f) {
+function Xa(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] : ya(a, c, b, e, f);
+  return 2 > a.length ? e ? W(a[0], b, c, d) : a[0] : Ba(a, c, b, e, f);
 }
 ;X.prototype.and = function() {
   if (this.result.length) {
@@ -1580,24 +1614,24 @@ function Ua(a, b, c, d, e, f) {
     if (a.length) {
       return Promise.all(a).then(function() {
         d = [b.result].concat(d);
-        b.result = Va(d, e, f, g, b.F, h);
+        b.result = Ya(d, e, f, g, b.F, h);
         return g ? b.result : b;
       });
     }
     d = [this.result].concat(d);
-    this.result = Va(d, e, f, g, this.F, h);
+    this.result = Ya(d, e, f, g, this.F, h);
     return g ? this.result : this;
   }
   return this;
 };
-function Va(a, b, c, d, e, f) {
+function Ya(a, b, c, d, e, f) {
   if (2 > a.length) {
     return [];
   }
   let g = [];
   B();
   let h = ca(a);
-  return h ? xa(a, h, b, c, f, e, d) : g;
+  return h ? Aa(a, h, b, c, f, e, d) : g;
 }
 ;X.prototype.xor = function() {
   const a = this;
@@ -1643,14 +1677,14 @@ function Va(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 = Wa(d, e, f, g, !h, a.F);
+      a.result = Za(d, e, f, g, !h, a.F);
       return h ? a.result : a;
     });
   }
-  d.length && (this.result.length && (d = [this.result].concat(d)), this.result = Wa(d, e, f, g, !h, a.F));
+  d.length && (this.result.length && (d = [this.result].concat(d)), this.result = Za(d, e, f, g, !h, a.F));
   return h ? this.result : this;
 };
-function Wa(a, b, c, d, e, f) {
+function Za(a, b, c, d, e, f) {
   if (!a.length) {
     return a;
   }
@@ -1744,14 +1778,14 @@ function Wa(a, b, c, d, e, f) {
   }
   if (c.length) {
     return Promise.all(c).then(function() {
-      a.result = Xa.call(a, d, e, f, g);
+      a.result = $a.call(a, d, e, f, g);
       return g ? a.result : a;
     });
   }
-  d.length && (this.result = Xa.call(this, d, e, f, g));
+  d.length && (this.result = $a.call(this, d, e, f, g));
   return g ? this.result : this;
 };
-function Xa(a, b, c, d) {
+function $a(a, b, c, d) {
   if (!a.length) {
     return this.result;
   }
@@ -1781,7 +1815,7 @@ function Xa(a, b, c, d) {
   return e;
 }
 ;function X(a) {
-  if (this.constructor !== X) {
+  if (!this || this.constructor !== X) {
     return new X(a);
   }
   if (a && a.index) {
@@ -1826,12 +1860,12 @@ X.prototype.boost = function(a) {
   return this;
 };
 X.prototype.resolve = function(a, b, c) {
-  Ya = 1;
+  ab = 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 Ya = 1;
+let ab = 1;
 L.prototype.search = function(a, b, c) {
   c || (!b && H(a) ? (c = a, a = "") : H(b) && (c = b, b = 0));
   let d = [], e;
@@ -1842,22 +1876,22 @@ L.prototype.search = function(a, b, c) {
     g = c.offset || 0;
     var p = c.context;
     f = c.suggest;
-    (h = Ya && !1 !== c.resolve) || (Ya = 0);
+    (h = ab && !1 !== c.resolve) || (ab = 0);
     k = h && c.enrich;
     m = c.boost;
     l = this.db && c.tag;
   } else {
-    h = this.resolve || Ya;
+    h = this.resolve || ab;
   }
   a = this.encoder.encode(a);
   e = a.length;
   b || !h || (b = 100);
   if (1 === e) {
-    return Za.call(this, a[0], "", b, g, h, k, l);
+    return bb.call(this, a[0], "", b, g, h, k, l);
   }
   p = this.depth && !1 !== p;
   if (2 === e && p && !f) {
-    return Za.call(this, a[0], a[1], b, g, h, k, l);
+    return bb.call(this, a[0], a[1], b, g, h, k, l);
   }
   let n = c = 0;
   if (1 < e) {
@@ -1882,10 +1916,10 @@ L.prototype.search = function(a, b, c) {
   }
   let q = 0, t;
   if (1 === e) {
-    return Za.call(this, a[0], "", b, g, h, k, l);
+    return bb.call(this, a[0], "", b, g, h, k, l);
   }
   if (2 === e && p && !f) {
-    return Za.call(this, a[0], a[1], b, g, h, k, l);
+    return bb.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) {
@@ -1896,7 +1930,7 @@ 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 = $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));
+        t ? (u = await Y(r, x, t, 0, 0, !1, !1), u = cb(u, d, f, r.R), f && !1 === u && d.length || (t = x)) : (u = await Y(r, x, "", 0, 0, !1, !1), u = cb(u, d, f, r.resolution));
         if (u) {
           return u;
         }
@@ -1915,12 +1949,12 @@ L.prototype.search = function(a, b, c) {
           }
         }
       }
-      return h ? xa(d, r.resolution, b, g, f, m, h) : new X(d[0]);
+      return h ? Aa(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 = $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));
+    t ? (r = Y(this, u, t, 0, 0, !1, !1), r = cb(r, d, f, this.R), f && !1 === r && d.length || (t = u)) : (r = Y(this, u, "", 0, 0, !1, !1), r = cb(r, d, f, this.resolution));
     if (r) {
       return r;
     }
@@ -1939,16 +1973,16 @@ L.prototype.search = function(a, b, c) {
       }
     }
   }
-  d = xa(d, this.resolution, b, g, f, m, h);
+  d = Aa(d, this.resolution, b, g, f, m, h);
   return h ? d : new X(d);
 };
-function Za(a, b, c, d, e, f, g) {
+function bb(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 $a(a, b, c, d) {
+function cb(a, b, c, d) {
   let e = [];
   if (a) {
     d = Math.min(a.length, d);
@@ -1986,15 +2020,15 @@ function Y(a, b, c, d, e, f, g, h) {
         }
       }
     } else {
-      ab(this.map, a), this.depth && ab(this.ctx, a);
+      db(this.map, a), this.depth && db(this.ctx, a);
     }
     b || this.reg.delete(a);
   }
-  this.db && (this.commit_task.push({del:a}), this.T && Sa(this));
+  this.db && (this.commit_task.push({del:a}), this.T && Va(this));
   this.cache && this.cache.remove(a);
   return this;
 };
-function ab(a, b) {
+function db(a, b) {
   let c = 0;
   if (a.constructor === Array) {
     for (let d = 0, e, f; d < a.length; d++) {
@@ -2009,24 +2043,24 @@ function ab(a, b) {
     }
   } else {
     for (let d of a) {
-      const e = d[0], f = ab(d[1], b);
+      const e = d[0], f = db(d[1], b);
       f ? c += f : a.delete(e);
     }
   }
   return c;
 }
 ;function L(a, b) {
-  if (this.constructor !== L) {
+  if (!this || this.constructor !== L) {
     return new L(a);
   }
   if (a) {
     var c = G(a) ? a : a.preset;
-    c && (Qa[c] || console.warn("Preset not found: " + c), a = Object.assign({}, Qa[c], a));
+    c && (Ta[c] || console.warn("Preset not found: " + c), a = Object.assign({}, Ta[c], a));
   } else {
     a = {};
   }
   c = a.context || {};
-  const d = G(a.encoder) ? Pa[a.encoder] : a.encode || a.encoder || Ha;
+  const d = G(a.encoder) ? Sa[a.encoder] : a.encode || a.encoder || Ka;
   this.encoder = d.encode ? d : "object" === typeof d ? new K(d) : {encode:d};
   let e;
   this.resolution = a.resolution || 9;
@@ -2063,7 +2097,7 @@ v.destroy = function() {
   this.commit_timer && (clearTimeout(this.commit_timer), this.commit_timer = null);
   return this.db.destroy();
 };
-function Sa(a) {
+function Va(a) {
   a.commit_timer || (a.commit_timer = setTimeout(function() {
     a.commit_timer = null;
     a.db.commit(a, void 0, void 0);
@@ -2087,7 +2121,7 @@ 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 bb(a) {
+function eb(a) {
   let b = 0;
   if (a.constructor === Array) {
     for (let c = 0, d; c < a.length; c++) {
@@ -2095,7 +2129,7 @@ function bb(a) {
     }
   } else {
     for (const c of a) {
-      const d = c[0], e = bb(c[1]);
+      const d = c[0], e = eb(c[1]);
       e ? b += e : a.delete(d);
     }
   }
@@ -2105,17 +2139,17 @@ v.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
-  bb(this.map);
-  this.depth && bb(this.ctx);
+  eb(this.map);
+  this.depth && eb(this.ctx);
   return this;
 };
-v.searchCache = Ga;
+v.searchCache = Ja;
 v.export = function(a, b, c, d = 0) {
   let e, f;
   switch(d) {
     case 0:
       e = "reg";
-      f = qa(this.reg);
+      f = sa(this.reg);
       break;
     case 1:
       e = "cfg";
@@ -2123,29 +2157,29 @@ v.export = function(a, b, c, d = 0) {
       break;
     case 2:
       e = "map";
-      f = oa(this.map);
+      f = oa(this.map, this.reg.size);
       break;
     case 3:
       e = "ctx";
-      f = pa(this.ctx);
+      f = qa(this.ctx, this.reg.size);
       break;
     default:
       return;
   }
-  return ra.call(this, a, b, e, c, d, f);
+  return ua.call(this, a, b, e, f, c, d);
 };
 v.import = function(a, b) {
   if (b) {
-    switch(G(b) && (b = JSON.parse(b)), a) {
+    switch(G(b) && (b = JSON.parse(b)), a = a.split("."), "json" === a[a.length - 1] && a.pop(), a = 1 < a.length ? a[1] : a[0], a) {
       case "reg":
         this.fastupdate = !1;
-        this.reg = new Set(b);
+        this.reg = ta(b, this.reg);
         break;
       case "map":
-        this.map = new Map(b);
+        this.map = pa(b, this.map);
         break;
       case "ctx":
-        this.ctx = new Map(b);
+        this.ctx = ra(b, this.ctx);
     }
   }
 };
@@ -2200,10 +2234,10 @@ v.serialize = function(a = !0) {
   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 = {}) {
+const gb = "undefined" !== typeof window && (window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB), hb = ["map", "ctx", "tag", "reg", "cfg"];
+function ib(a, b = {}) {
   if (!this) {
-    return new fb(a, b);
+    return new ib(a, b);
   }
   "object" === typeof a && (b = a = a.name);
   a || console.info("Default storage space was used, because a name was not passed.");
@@ -2213,7 +2247,7 @@ function fb(a, b = {}) {
   this.db = null;
   this.h = {};
 }
-v = fb.prototype;
+v = ib.prototype;
 v.mount = function(a) {
   if (!a.encoder) {
     return a.mount(this);
@@ -2225,10 +2259,10 @@ 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);
+    const d = gb.open(a.id + (a.field ? ":" + a.field : ""), 1);
     d.onupgradeneeded = function() {
       const e = a.db = this.result;
-      eb.forEach(f => {
+      hb.forEach(f => {
         e.objectStoreNames.contains(f) || e.createObjectStore(f);
       });
     };
@@ -2254,12 +2288,12 @@ v.close = function() {
   this.db = null;
 };
 v.destroy = function() {
-  return db.deleteDatabase(this.id + (this.field ? ":" + this.field : ""));
+  return gb.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();
+  const a = this.db.transaction(hb, "readwrite");
+  for (let b = 0; b < hb.length; b++) {
+    a.objectStore(hb[b]).clear();
   }
   return Z(a);
 };
@@ -2443,7 +2477,7 @@ 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 gb(a, b, c) {
+function jb(a, b, c) {
   const d = a.value;
   let e, f, g = 0;
   for (let h = 0, k; h < d.length; h++) {
@@ -2472,17 +2506,17 @@ v.remove = function(a) {
   return Promise.all([this.transaction("map", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       const c = this.result;
-      c && gb(c, a);
+      c && jb(c, a);
     };
   }), this.transaction("ctx", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       const c = this.result;
-      c && gb(c, a);
+      c && jb(c, a);
     };
   }), this.transaction("tag", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       const c = this.result;
-      c && gb(c, a, !0);
+      c && jb(c, a, !0);
     };
   }), this.transaction("reg", "readwrite", function(b) {
     for (let c = 0; c < a.length; c++) {
@@ -2502,6 +2536,6 @@ function Z(a) {
     a = null;
   });
 }
-;export default {Index:L, Charset:Pa, Encoder:K, Document:T, Worker:N, Resolver:X, IndexedDB:fb, Language:{}};
+;export default {Index:L, Charset:Sa, Encoder:K, Document:T, Worker:N, Resolver:X, IndexedDB:ib, 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
+export const Index=L;export const  Charset=Sa;export const  Encoder=K;export const  Document=T;export const  Worker=N;export const  Resolver=X;export const  IndexedDB=ib;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 e131e54..24f3319 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",
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+["\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||this.constructor!==K)return new K(...arguments);for(let b=0;b<arguments.length;b++)this.assign(arguments[b])}
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 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 +20,75 @@ 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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+L.prototype.search=function(a,b,c){c||(!b&&G(a)?(c=a,a=""):G(b)&&(c=b,b=0));let d=[],e;let f,g=0,h,k,l,m;if(c){a=c.query||a;b=c.limit||b;g=c.offset||0;var p=c.context;f=c.suggest;(h=ab&&!1!==c.resolve)||(ab=0);k=h&&c.enrich;m=c.boost;l=this.db&&c.tag}else h=this.resolve||ab;a=this.encoder.encode(a);e=a.length;b||!h||(b=100);if(1===e)return bb.call(this,a[0],"",b,g,h,k,l);p=this.depth&&!1!==p;if(2===e&&p&&!f)return bb.call(this,a[0],a[1],b,g,h,k,l);let n=c=0;if(1<e){const t=B(),u=[];for(let x=0,D;x<
+e;x++)if((D=a[x])&&!t[D]){if(f||this.db||Y(this,D))u.push(D),t[D]=1;else return h?d:new X(d);const y=D.length;c=Math.max(c,y);n=n?Math.min(n,y):y}a=u;e=a.length}if(!e)return h?d:new X(d);let q=0,r;if(1===e)return bb.call(this,a[0],"",b,g,h,k,l);if(2===e&&p&&!f)return bb.call(this,a[0],a[1],b,g,h,k,l);1<e&&(p?(r=a[0],q=1):9<c&&3<c/n&&a.sort(aa));if(this.db){if(this.db.search&&(p=this.db.search(this,a,b,g,f,h,k,l),!1!==p))return p;const t=this;return async function(){for(let u,x;q<e;q++){x=a[q];r?(u=
+await Y(t,x,r,0,0,!1,!1),u=cb(u,d,f,t.R),f&&!1===u&&d.length||(r=x)):(u=await Y(t,x,"",0,0,!1,!1),u=cb(u,d,f,t.resolution));if(u)return u;if(f&&q===e-1){let D=d.length;if(!D){if(r){r="";q=-1;continue}return d}if(1===D)return h?W(d[0],b,g):new X(d[0])}}return h?Aa(d,t.resolution,b,g,f,m,h):new X(d[0])}()}for(let t,u;q<e;q++){u=a[q];r?(t=Y(this,u,r,0,0,!1,!1),t=cb(t,d,f,this.R),f&&!1===t&&d.length||(r=u)):(t=Y(this,u,"",0,0,!1,!1),t=cb(t,d,f,this.resolution));if(t)return t;if(f&&q===e-1){p=d.length;
+if(!p){if(r){r="";q=-1;continue}return d}if(1===p)return h?W(d[0],b,g):new X(d[0])}}d=Aa(d,this.resolution,b,g,f,m,h);return h?d:new X(d)};function bb(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 cb(a,b,c,d){let e=[];if(a){d=Math.min(a.length,d);for(let f=0,g;f<d;f++)(g=a[f])&&g&&(e[f]=g);if(e.length){b.push(e);return}}return!c&&e}
+function Y(a,b,c,d,e,f,g,h){let k;c&&(k=a.bidirectional&&b>c);if(a.db)return c?a.db.get(k?c:b,k?b:c,d,e,f,g,h):a.db.get(b,"",d,e,f,g,h);a=c?(a=a.ctx.get(k?b:c))&&a.get(k?c:b):a.map.get(b);return a};L.prototype.remove=function(a,b){const c=this.reg.size&&(this.fastupdate?this.reg.get(a):this.reg.has(a));if(c){if(this.fastupdate)for(let d=0,e;d<c.length;d++){if(e=c[d])if(2>e.length)e.pop();else{const f=e.indexOf(a);f===c.length-1?e.pop():e.splice(f,1)}}else db(this.map,a),this.depth&&db(this.ctx,a);b||this.reg.delete(a)}this.db&&(this.commit_task.push({del:a}),this.T&&Va(this));this.cache&&this.cache.remove(a);return this};
+function db(a,b){let c=0;if(a.constructor===Array)for(let d=0,e,f;d<a.length;d++){if((e=a[d])&&e.length)if(f=e.indexOf(b),0<=f){1<e.length?(e.splice(f,1),c++):delete a[d];break}else c++}else for(let d of a){const e=d[0],f=db(d[1],b);f?c+=f:a.delete(e)}return c};function L(a,b){if(!this||this.constructor!==L)return new L(a);if(a){var c=F(a)?a:a.preset;c&&(a=Object.assign({},Ta[c],a))}else a={};c=a.context||{};const d=F(a.encoder)?Sa[a.encoder]:a.encode||a.encoder||Ka;this.encoder=d.encode?d:"object"===typeof d?new K(d):{encode:d};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)&&(this.keystore=
 e);this.map=e?new R(e):new Map;this.ctx=e?new R(e):new Map;this.reg=b||(this.fastupdate?e?new R(e):new Map:e?new S(e):new Set);this.R=c.resolution||1;this.rtl=d.rtl||a.rtl||!1;this.cache=(e=a.cache||null)&&new U(e);this.resolve=!1!==a.resolve;if(e=a.db)this.db=this.mount(e);this.T=!1!==a.commit;this.commit_task=[];this.commit_timer=null}v=L.prototype;v.mount=function(a){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return a.mount(this)};
-v.commit=function(a,b){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return this.db.commit(this,a,b)};v.destroy=function(){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return this.db.destroy()};function Sa(a){a.commit_timer||(a.commit_timer=setTimeout(function(){a.commit_timer=null;a.db.commit(a,void 0,void 0)},0))}
+v.commit=function(a,b){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return this.db.commit(this,a,b)};v.destroy=function(){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return this.db.destroy()};function Va(a){a.commit_timer||(a.commit_timer=setTimeout(function(){a.commit_timer=null;a.db.commit(a,void 0,void 0)},0))}
 v.clear=function(){this.map.clear();this.ctx.clear();this.reg.clear();this.cache&&this.cache.clear();this.db&&(this.commit_timer&&clearTimeout(this.commit_timer),this.commit_timer=null,this.commit_task=[{clear:!0}]);return this};v.append=function(a,b){return this.add(a,b,!0)};v.contain=function(a){return this.db?this.db.has(a):this.reg.has(a)};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 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)}};
+function fb(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=fb(c[1]);e?b+=e:a.delete(d)}return b}v.cleanup=function(){if(!this.fastupdate)return this;fb(this.map);this.depth&&fb(this.ctx);return this};v.searchCache=Ja;
+v.export=function(a,b,c,d=0){let e,f;switch(d){case 0:e="reg";f=sa(this.reg);break;case 1:e="cfg";f={};break;case 2:e="map";f=oa(this.map,this.reg.size);break;case 3:e="ctx";f=qa(this.ctx,this.reg.size);break;default:return}return ua.call(this,a,b,e,f,c,d)};
+v.import=function(a,b){if(b)switch(F(b)&&(b=JSON.parse(b)),a=a.split("."),"json"===a[a.length-1]&&a.pop(),a=1<a.length?a[1]:a[0],a){case "reg":this.fastupdate=!1;this.reg=ta(b,this.reg);break;case "map":this.map=pa(b,this.map);break;case "ctx":this.ctx=ra(b,this.ctx)}};
 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 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)};
+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 gb="undefined"!==typeof window&&(window.indexedDB||window.mozIndexedDB||window.webkitIndexedDB||window.msIndexedDB),hb=["map","ctx","tag","reg","cfg"];
+function ib(a,b={}){if(!this)return new ib(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=ib.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=gb.open(a.id+(a.field?":"+a.field:""),1);d.onupgradeneeded=function(){const e=a.db=this.result;hb.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 gb.deleteDatabase(this.id+(this.field?":"+this.field:""))};v.clear=function(){const a=this.db.transaction(hb,"readwrite");for(let b=0;b<hb.length;b++)a.objectStore(hb[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 +97,7 @@ 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 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
+function jb(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&&jb(c,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&jb(c,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&jb(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:Sa,Encoder:K,Document:T,Worker:N,Resolver:X,IndexedDB:ib,Language:{}};
+export const Index=L;export const Charset=Sa;export const Encoder=K;export const Document=T;export const Worker=N;export const Resolver=X;export const IndexedDB=ib;export const Language={};
\ No newline at end of file
diff --git a/dist/flexsearch.compact.debug.js b/dist/flexsearch.compact.debug.js
index da392ff..4fc1c62 100644
--- a/dist/flexsearch.compact.debug.js
+++ b/dist/flexsearch.compact.debug.js
@@ -76,7 +76,7 @@ function I(a, c) {
 "\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 K(a) {
-  if (this.constructor !== K) {
+  if (!this || this.constructor !== K) {
     return new K(...arguments);
   }
   for (let c = 0; c < arguments.length; c++) {
@@ -228,37 +228,68 @@ function M(a) {
     return c;
   };
 }
-;function N(a) {
-  const c = [];
-  for (const b of a.entries()) {
-    c.push(b);
+;function N(a, c = 0) {
+  let b = [], e = [];
+  c && (c = 250000 / c * 5000 | 0);
+  for (const d of a.entries()) {
+    e.push(d), e.length === c && (b.push(e), e = []);
+  }
+  e.length && b.push(e);
+  return b;
+}
+function O(a, c) {
+  c || (c = new Map());
+  for (let b = 0, e; b < a.length; b++) {
+    e = a[b], c.set(e[0], e[1]);
   }
   return c;
 }
-function ja(a) {
-  const c = [];
-  for (const b of a.entries()) {
-    c.push(N(b));
+function ja(a, c = 0) {
+  let b = [], e = [];
+  c && (c = 250000 / c * 1000 | 0);
+  for (const d of a.entries()) {
+    e.push([d[0], N(d[1])[0]]), e.length === c && (b.push(e), e = []);
+  }
+  e.length && b.push(e);
+  return b;
+}
+function ka(a, c) {
+  c || (c = new Map());
+  for (let b = 0, e, d; b < a.length; b++) {
+    e = a[b], d = c.get(e[0]), c.set(e[0], O(e[1], d));
   }
   return c;
 }
-function ka(a) {
-  const c = [];
-  for (const b of a.keys()) {
-    c.push(b);
+function la(a) {
+  let c = [], b = [];
+  for (const e of a.keys()) {
+    b.push(e), 250000 === b.length && (c.push(b), b = []);
+  }
+  b.length && c.push(b);
+  return c;
+}
+function ma(a, c) {
+  c || (c = new Set());
+  for (let b = 0; b < a.length; b++) {
+    c.add(a[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);
+function P(a, c, b, e, d, f, g = 0) {
+  const h = e && e.constructor === Array;
+  var k = h ? e.shift() : e;
+  if (!k) {
+    return this.export(a, c, d, f + 1);
+  }
+  if ((k = a((c ? c + "." : "") + (g + 1) + "." + b, JSON.stringify(k))) && k.then) {
+    const l = this;
+    return k.then(function() {
+      return P.call(l, a, c, b, h ? e : null, d, f, g + 1);
     });
   }
-  return this.export(a, c, e, d + 1);
+  return P.call(this, a, c, b, h ? e : null, d, f, g + 1);
 }
-;O.prototype.add = function(a, c, b) {
+;Q.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)) {
@@ -272,7 +303,7 @@ function la(a, c, b, e, d, f) {
         d && e.add(a, d, !1, !0);
       } else {
         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);
+          k.constructor === String ? k = ["" + k] : E(k) && (k = [k]), R(c, k, this.H, 0, e, a, k[0], b);
         }
       }
     }
@@ -323,7 +354,7 @@ function la(a, c, b, e, d, f) {
             h[l] = c[l];
             continue;
           }
-          Q(c, h, l, 0, l[0], m);
+          na(c, h, l, 0, l[0], m);
         }
       }
       this.store.set(a, h || c);
@@ -331,21 +362,21 @@ function la(a, c, b, e, d, f) {
   }
   return this;
 };
-function Q(a, c, b, e, d, f) {
+function na(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++) {
-        Q(a, c, b, e, d);
+        na(a, c, b, e, d);
       }
     } else {
-      c = c[d] || (c[d] = C()), d = b[++e], Q(a, c, b, e, d);
+      c = c[d] || (c[d] = C()), d = b[++e], na(a, c, b, e, d);
     }
   }
 }
-function P(a, c, b, e, d, f, g, h) {
+function R(a, c, b, e, d, f, g, h) {
   if (a = a[g]) {
     if (e === c.length - 1) {
       if (a.constructor === Array) {
@@ -361,15 +392,15 @@ function P(a, c, b, e, d, f, g, h) {
     } else {
       if (a.constructor === Array) {
         for (g = 0; g < a.length; g++) {
-          P(a, c, b, e, d, f, g, h);
+          R(a, c, b, e, d, f, g, h);
         }
       } else {
-        g = c[++e], P(a, c, b, e, d, f, g, h);
+        g = c[++e], R(a, c, b, e, d, f, g, h);
       }
     }
   }
 }
-;function ma(a, c) {
+;function oa(a, c) {
   const b = C(), e = [];
   for (let d = 0, f; d < c.length; d++) {
     f = c[d];
@@ -382,7 +413,7 @@ function P(a, c, b, e, d, f, g, h) {
   }
   return e;
 }
-;O.prototype.search = function(a, c, b, e) {
+;Q.prototype.search = function(a, c, b, e) {
   b || (!c && H(a) ? (b = a, a = "") : H(c) && (b = c, c = 0));
   let d = [];
   var f = [];
@@ -438,7 +469,7 @@ function P(a, c, b, e, d, f, g, h) {
         e = [];
         if (u.length) {
           for (f = 0; f < u.length; f += 2) {
-            r = na.call(this, u[f], u[f + 1], c, n, g), d.push({field:u[f], tag:u[f + 1], result:r});
+            r = pa.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) {
@@ -488,7 +519,7 @@ function P(a, c, b, e, d, f, g, h) {
         }
       }
       if (y) {
-        q = ma(q, v);
+        q = oa(q, v);
         A = q.length;
         if (!A && !k) {
           return d;
@@ -517,15 +548,15 @@ function P(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 = oa.call(this, q));
+    g && q.length && !q[0].doc && q.length && (q = qa.call(this, q));
     if (r) {
       return q;
     }
     d[w] = {field:f[w], result:q};
   }
-  return h ? pa(d, c) : p ? qa(d, a, this.index, this.field, this.C, p) : d;
+  return h ? ra(d, c) : p ? sa(d, a, this.index, this.field, this.C, p) : d;
 };
-function qa(a, c, b, e, d, f) {
+function sa(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;
@@ -567,7 +598,7 @@ function qa(a, c, b, e, d, f) {
   }
   return a;
 }
-function pa(a, c) {
+function ra(a, c) {
   const b = [], e = C();
   for (let d = 0, f, g; d < a.length; d++) {
     f = a[d];
@@ -586,7 +617,7 @@ function pa(a, c) {
   }
   return b;
 }
-function na(a, c, b, e, d) {
+function pa(a, c, b, e, d) {
   let f = this.tag.get(a);
   if (!f) {
     return console.warn("Tag '" + a + "' was not found"), [];
@@ -595,43 +626,43 @@ function na(a, c, b, e, d) {
     if (a > b || e) {
       f = f.slice(e, e + b);
     }
-    d && (f = oa.call(this, f));
+    d && (f = qa.call(this, f));
     return f;
   }
 }
-function oa(a) {
+function qa(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 O(a) {
-  if (this.constructor !== O) {
-    return new O(a);
+;function Q(a) {
+  if (!this || this.constructor !== Q) {
+    return new Q(a);
   }
   const c = a.document || a.doc || a;
   var b;
   this.C = [];
   this.field = [];
   this.H = [];
-  this.key = (b = c.key || c.id) && R(b, this.H) || "id";
+  this.key = (b = c.key || c.id) && S(b, this.H) || "id";
   this.reg = (this.fastupdate = !!a.fastupdate) ? new Map() : new Set();
   this.h = (b = c.store || null) && !0 !== b && [];
   this.store = b && new Map();
-  this.cache = (b = a.cache || null) && new S(b);
+  this.cache = (b = a.cache || null) && new T(b);
   a.cache = !1;
   b = new Map();
   let e = c.index || c.field || c;
   E(e) && (e = [e]);
   for (let d = 0, f, g; d < e.length; d++) {
-    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;
+    f = e[d], E(f) || (g = f, f = f.field), g = H(g) ? Object.assign({}, a, g) : a, b.set(f, new U(g, this.reg)), g.custom ? this.C[d] = g.custom : (this.C[d] = S(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.h) {
     a = c.store;
     E(a) && (a = [a]);
     for (let d = 0, f, g; d < a.length; d++) {
-      f = a[d], g = f.field || f, f.custom ? (this.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));
+      f = a[d], g = f.field || f, f.custom ? (this.h[d] = f.custom, f.custom.S = g) : (this.h[d] = S(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;
@@ -647,14 +678,14 @@ function oa(a) {
         if (!g) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
-        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));
+        f.custom ? this.B[d] = f.custom : (this.B[d] = S(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 R(a, c) {
+function S(a, c) {
   const b = a.split(":");
   let e = 0;
   for (let d = 0; d < b.length; d++) {
@@ -663,7 +694,7 @@ function R(a, c) {
   e < b.length && (b.length = e);
   return 1 < e ? b : b[0];
 }
-x = O.prototype;
+x = Q.prototype;
 x.append = function(a, c) {
   return this.add(a, c, !0);
 };
@@ -719,28 +750,28 @@ x.set = function(a, c) {
   this.store.set(a, c);
   return this;
 };
-x.searchCache = ra;
+x.searchCache = ta;
 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);
+        return h.export(a, g, b + 1);
       });
     }
-    return this.export(a, g, b + 1, e = 0);
+    return this.export(a, g, b + 1);
   }
   let d, f;
   switch(e) {
     case 0:
       d = "reg";
-      f = ka(this.reg);
+      f = la(this.reg);
       c = null;
       break;
     case 1:
       d = "tag";
-      f = ja(this.tag);
+      f = ja(this.tag, this.reg.size);
       c = null;
       break;
     case 2:
@@ -756,33 +787,36 @@ x.export = function(a, c, b = 0, e = 0) {
     default:
       return;
   }
-  return la.call(this, a, c, d, b, e, f);
+  return P.call(this, a, c, d, f, b, e);
 };
 x.import = function(a, c) {
   if (c) {
-    switch(E(c) && (c = JSON.parse(c)), a) {
-      case "tag":
-        break;
+    E(c) && (c = JSON.parse(c));
+    a = a.split(".");
+    "json" === a[a.length - 1] && a.pop();
+    var b = 2 < a.length ? a[0] : "";
+    a = 2 < a.length ? a[2] : a[1];
+    if (b) {
+      return this.index.get(b).import(a, c);
+    }
+    switch(a) {
       case "reg":
         this.fastupdate = !1;
-        this.reg = new Set(c);
+        this.reg = ma(c, this.reg);
         for (let e = 0, d; e < this.field.length; e++) {
           d = this.index.get(this.field[e]), d.fastupdate = !1, d.reg = this.reg;
         }
         break;
-      case "doc":
-        this.store = new Map(c);
+      case "tag":
+        this.tag = ka(c, this.tag);
         break;
-      default:
-        a = a.split(".");
-        const b = a[0];
-        a = a[1];
-        b && a && this.index.get(b).import(a, c);
+      case "doc":
+        this.store = O(c, this.store);
     }
   }
 };
-ia(O.prototype);
-function ra(a, c, b) {
+ia(Q.prototype);
+function ta(a, c, b) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
   let e = this.cache.get(a);
   if (!e) {
@@ -798,57 +832,57 @@ function ra(a, c, b) {
   }
   return e;
 }
-function S(a) {
+function T(a) {
   this.limit = a && !0 !== a ? a : 1000;
   this.cache = new Map();
   this.A = "";
 }
-S.prototype.set = function(a, c) {
+T.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);
 };
-S.prototype.get = function(a) {
+T.prototype.get = function(a) {
   const c = this.cache.get(a);
   c && this.A !== a && (this.cache.delete(a), this.cache.set(this.A = a, c));
   return c;
 };
-S.prototype.remove = function(a) {
+T.prototype.remove = function(a) {
   for (const c of this.cache) {
     const b = c[0];
     c[1].includes(a) && this.cache.delete(b);
   }
 };
-S.prototype.clear = function() {
+T.prototype.clear = function() {
   this.cache.clear();
   this.A = "";
 };
-const sa = {normalize:function(a) {
+const ua = {normalize:function(a) {
   return a.toLowerCase();
 }, dedupe:!1};
-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;
-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) {
+const va = 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 wa = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), xa = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
+const ya = {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 za = /[\x00-\x7F]+/g;
+const Aa = /[\x00-\x7F]+/g;
+const Ba = /[\x00-\x7F]+/g;
+var Ca = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:ua, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:va}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:va, matcher:wa, replacer:xa}, LatinExtra:{normalize:!0, dedupe:!0, mapper:va, replacer:xa.concat([/(?!^)[aeo]/g, ""]), matcher:wa}, 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 = 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++) {
+    let e = c.charAt(0), d = ya[e];
+    for (let f = 1, g; f < c.length && (g = c.charAt(f), "h" === g || "w" === g || !(g = ya[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(wa, " ");
+  return ("" + a).replace(za, " ");
 }}, CjkDefault:{normalize:!1, dedupe:!0, split:"", prepare:function(a) {
-  return ("" + a).replace(xa, "");
+  return ("" + a).replace(Aa, "");
 }}, CyrillicDefault:{normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(ya, " ");
+  return ("" + a).replace(Ba, " ");
 }}};
-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}}};
+const Da = {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();
-T.prototype.add = function(a, c, b, e) {
+U.prototype.add = function(a, c, b, e) {
   if (c && (a || 0 === a)) {
     if (!e && !b && this.reg.has(a)) {
       return this.update(a, c);
@@ -914,7 +948,7 @@ function W(a, c, b, e, d, f, g) {
 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 Ba(a, c, b) {
+;function Ea(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;
   }
@@ -944,7 +978,7 @@ function V(a, c, b, e, d) {
   }
   return e.length ? e = 1 < e.length ? [].concat.apply([], e) : e[0] : e;
 }
-;T.prototype.search = function(a, c, b) {
+;U.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) {
@@ -1003,7 +1037,7 @@ function V(a, c, b, e, d) {
   }
   for (let n, t; l < b; l++) {
     t = a[l];
-    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));
+    m ? (n = Y(this, t, m), n = Fa(n, e, g, this.P), g && !1 === n && e.length || (m = t)) : (n = Y(this, t, ""), n = Fa(n, e, g, this.resolution));
     if (n) {
       return n;
     }
@@ -1018,7 +1052,7 @@ function V(a, c, b, e, d) {
         return e;
       }
       if (1 === f) {
-        return Ba(e[0], c, d);
+        return Ea(e[0], c, d);
       }
     }
   }
@@ -1078,9 +1112,9 @@ function V(a, c, b, e, d) {
   return e;
 };
 function X(a, c, b, e) {
-  return (a = Y(this, a, c)) && a.length ? Ba(a, b, e) : [];
+  return (a = Y(this, a, c)) && a.length ? Ea(a, b, e) : [];
 }
-function Ca(a, c, b, e) {
+function Fa(a, c, b, e) {
   let d = [];
   if (a) {
     e = Math.min(a.length, e);
@@ -1100,7 +1134,7 @@ function Y(a, 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) {
+;U.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) {
@@ -1115,14 +1149,14 @@ function Y(a, c, b) {
         }
       }
     } else {
-      Da(this.map, a), this.depth && Da(this.ctx, a);
+      Ga(this.map, a), this.depth && Ga(this.ctx, a);
     }
     c || this.reg.delete(a);
   }
   this.cache && this.cache.remove(a);
   return this;
 };
-function Da(a, c) {
+function Ga(a, c) {
   let b = 0;
   if (a.constructor === Array) {
     for (let e = 0, d, f; e < a.length; e++) {
@@ -1137,24 +1171,24 @@ function Da(a, c) {
     }
   } else {
     for (let e of a) {
-      const d = e[0], f = Da(e[1], c);
+      const d = e[0], f = Ga(e[1], c);
       f ? b += f : a.delete(d);
     }
   }
   return b;
 }
-;function T(a, c) {
-  if (this.constructor !== T) {
-    return new T(a);
+;function U(a, c) {
+  if (!this || this.constructor !== U) {
+    return new U(a);
   }
   if (a) {
     var b = E(a) ? a : a.preset;
-    b && (Aa[b] || console.warn("Preset not found: " + b), a = Object.assign({}, Aa[b], a));
+    b && (Da[b] || console.warn("Preset not found: " + b), a = Object.assign({}, Da[b], a));
   } else {
     a = {};
   }
   b = a.context || {};
-  const e = E(a.encoder) ? za[a.encoder] : a.encode || a.encoder || sa;
+  const e = E(a.encoder) ? Ca[a.encoder] : a.encode || a.encoder || ua;
   this.encoder = e.encode ? e : "object" === typeof e ? new K(e) : {encode:e};
   let d;
   this.resolution = a.resolution || 9;
@@ -1169,9 +1203,9 @@ function Da(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 S(d);
+  this.cache = (d = a.cache || null) && new T(d);
 }
-x = T.prototype;
+x = U.prototype;
 x.clear = function() {
   this.map.clear();
   this.ctx.clear();
@@ -1189,7 +1223,7 @@ 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 Ea(a) {
+function Ha(a) {
   let c = 0;
   if (a.constructor === Array) {
     for (let b = 0, e; b < a.length; b++) {
@@ -1197,7 +1231,7 @@ function Ea(a) {
     }
   } else {
     for (const b of a) {
-      const e = b[0], d = Ea(b[1]);
+      const e = b[0], d = Ha(b[1]);
       d ? c += d : a.delete(e);
     }
   }
@@ -1207,17 +1241,17 @@ x.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
-  Ea(this.map);
-  this.depth && Ea(this.ctx);
+  Ha(this.map);
+  this.depth && Ha(this.ctx);
   return this;
 };
-x.searchCache = ra;
+x.searchCache = ta;
 x.export = function(a, c, b, e = 0) {
   let d, f;
   switch(e) {
     case 0:
       d = "reg";
-      f = ka(this.reg);
+      f = la(this.reg);
       break;
     case 1:
       d = "cfg";
@@ -1225,29 +1259,29 @@ x.export = function(a, c, b, e = 0) {
       break;
     case 2:
       d = "map";
-      f = N(this.map);
+      f = N(this.map, this.reg.size);
       break;
     case 3:
       d = "ctx";
-      f = ja(this.ctx);
+      f = ja(this.ctx, this.reg.size);
       break;
     default:
       return;
   }
-  return la.call(this, a, c, d, b, e, f);
+  return P.call(this, a, c, d, f, b, e);
 };
 x.import = function(a, c) {
   if (c) {
-    switch(E(c) && (c = JSON.parse(c)), a) {
+    switch(E(c) && (c = JSON.parse(c)), a = a.split("."), "json" === a[a.length - 1] && a.pop(), a = 1 < a.length ? a[1] : a[0], a) {
       case "reg":
         this.fastupdate = !1;
-        this.reg = new Set(c);
+        this.reg = ma(c, this.reg);
         break;
       case "map":
-        this.map = new Map(c);
+        this.map = O(c, this.map);
         break;
       case "ctx":
-        this.ctx = new Map(c);
+        this.ctx = ka(c, this.ctx);
     }
   }
 };
@@ -1301,10 +1335,10 @@ x.serialize = function(a = !0) {
   d = "index.ctx=new Map([" + d + "]);";
   return a ? "function inject(index){" + c + e + d + "}" : c + e + d;
 };
-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;
+ia(U.prototype);
+const Ia = {Index:U, Charset:Ca, Encoder:K, Document:Q, Worker:null, Resolver:null, IndexedDB:null, Language:{}}, Z = self;
+let Ja;
+(Ja = Z.define) && Ja.amd ? Ja([], function() {
+  return Ia;
+}) : "object" === typeof Z.exports ? Z.exports = Ia : Z.FlexSearch = Ia;
 }(this||self));
diff --git a/dist/flexsearch.compact.min.js b/dist/flexsearch.compact.min.js
index 5f9ec2d..4e50808 100644
--- a/dist/flexsearch.compact.min.js
+++ b/dist/flexsearch.compact.min.js
@@ -5,47 +5,50 @@
  * Hosted by Nextapps GmbH
  * https://github.com/nextapps-de/flexsearch
  */
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diff --git a/dist/flexsearch.compact.module.debug.js b/dist/flexsearch.compact.module.debug.js
index c4b1452..8d3f4b2 100644
--- a/dist/flexsearch.compact.module.debug.js
+++ b/dist/flexsearch.compact.module.debug.js
@@ -75,7 +75,7 @@ function I(a, c) {
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 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 K(a) {
-  if (this.constructor !== K) {
+  if (!this || this.constructor !== K) {
     return new K(...arguments);
   }
   for (let c = 0; c < arguments.length; c++) {
@@ -227,37 +227,68 @@ function M(a) {
     return c;
   };
 }
-;function N(a) {
-  const c = [];
-  for (const b of a.entries()) {
-    c.push(b);
+;function N(a, c = 0) {
+  let b = [], e = [];
+  c && (c = 250000 / c * 5000 | 0);
+  for (const d of a.entries()) {
+    e.push(d), e.length === c && (b.push(e), e = []);
+  }
+  e.length && b.push(e);
+  return b;
+}
+function O(a, c) {
+  c || (c = new Map());
+  for (let b = 0, e; b < a.length; b++) {
+    e = a[b], c.set(e[0], e[1]);
   }
   return c;
 }
-function ja(a) {
-  const c = [];
-  for (const b of a.entries()) {
-    c.push(N(b));
+function ja(a, c = 0) {
+  let b = [], e = [];
+  c && (c = 250000 / c * 1000 | 0);
+  for (const d of a.entries()) {
+    e.push([d[0], N(d[1])[0]]), e.length === c && (b.push(e), e = []);
+  }
+  e.length && b.push(e);
+  return b;
+}
+function ka(a, c) {
+  c || (c = new Map());
+  for (let b = 0, e, d; b < a.length; b++) {
+    e = a[b], d = c.get(e[0]), c.set(e[0], O(e[1], d));
   }
   return c;
 }
-function ka(a) {
-  const c = [];
-  for (const b of a.keys()) {
-    c.push(b);
+function la(a) {
+  let c = [], b = [];
+  for (const e of a.keys()) {
+    b.push(e), 250000 === b.length && (c.push(b), b = []);
+  }
+  b.length && c.push(b);
+  return c;
+}
+function ma(a, c) {
+  c || (c = new Set());
+  for (let b = 0; b < a.length; b++) {
+    c.add(a[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);
+function P(a, c, b, e, d, f, g = 0) {
+  const h = e && e.constructor === Array;
+  var k = h ? e.shift() : e;
+  if (!k) {
+    return this.export(a, c, d, f + 1);
+  }
+  if ((k = a((c ? c + "." : "") + (g + 1) + "." + b, JSON.stringify(k))) && k.then) {
+    const l = this;
+    return k.then(function() {
+      return P.call(l, a, c, b, h ? e : null, d, f, g + 1);
     });
   }
-  return this.export(a, c, e, d + 1);
+  return P.call(this, a, c, b, h ? e : null, d, f, g + 1);
 }
-;O.prototype.add = function(a, c, b) {
+;Q.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)) {
@@ -271,7 +302,7 @@ function la(a, c, b, e, d, f) {
         d && e.add(a, d, !1, !0);
       } else {
         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);
+          k.constructor === String ? k = ["" + k] : E(k) && (k = [k]), R(c, k, this.H, 0, e, a, k[0], b);
         }
       }
     }
@@ -322,7 +353,7 @@ function la(a, c, b, e, d, f) {
             h[l] = c[l];
             continue;
           }
-          Q(c, h, l, 0, l[0], m);
+          S(c, h, l, 0, l[0], m);
         }
       }
       this.store.set(a, h || c);
@@ -330,21 +361,21 @@ function la(a, c, b, e, d, f) {
   }
   return this;
 };
-function Q(a, c, b, e, d, f) {
+function S(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++) {
-        Q(a, c, b, e, d);
+        S(a, c, b, e, d);
       }
     } else {
-      c = c[d] || (c[d] = C()), d = b[++e], Q(a, c, b, e, d);
+      c = c[d] || (c[d] = C()), d = b[++e], S(a, c, b, e, d);
     }
   }
 }
-function P(a, c, b, e, d, f, g, h) {
+function R(a, c, b, e, d, f, g, h) {
   if (a = a[g]) {
     if (e === c.length - 1) {
       if (a.constructor === Array) {
@@ -360,15 +391,15 @@ function P(a, c, b, e, d, f, g, h) {
     } else {
       if (a.constructor === Array) {
         for (g = 0; g < a.length; g++) {
-          P(a, c, b, e, d, f, g, h);
+          R(a, c, b, e, d, f, g, h);
         }
       } else {
-        g = c[++e], P(a, c, b, e, d, f, g, h);
+        g = c[++e], R(a, c, b, e, d, f, g, h);
       }
     }
   }
 }
-;function ma(a, c) {
+;function na(a, c) {
   const b = C(), e = [];
   for (let d = 0, f; d < c.length; d++) {
     f = c[d];
@@ -381,7 +412,7 @@ function P(a, c, b, e, d, f, g, h) {
   }
   return e;
 }
-;O.prototype.search = function(a, c, b, e) {
+;Q.prototype.search = function(a, c, b, e) {
   b || (!c && H(a) ? (b = a, a = "") : H(c) && (b = c, c = 0));
   let d = [];
   var f = [];
@@ -437,7 +468,7 @@ function P(a, c, b, e, d, f, g, h) {
         e = [];
         if (u.length) {
           for (f = 0; f < u.length; f += 2) {
-            r = na.call(this, u[f], u[f + 1], c, n, g), d.push({field:u[f], tag:u[f + 1], result:r});
+            r = oa.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) {
@@ -487,7 +518,7 @@ function P(a, c, b, e, d, f, g, h) {
         }
       }
       if (y) {
-        q = ma(q, v);
+        q = na(q, v);
         A = q.length;
         if (!A && !k) {
           return d;
@@ -516,15 +547,15 @@ function P(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 = oa.call(this, q));
+    g && q.length && !q[0].doc && q.length && (q = pa.call(this, q));
     if (r) {
       return q;
     }
     d[w] = {field:f[w], result:q};
   }
-  return h ? pa(d, c) : p ? qa(d, a, this.index, this.field, this.C, p) : d;
+  return h ? qa(d, c) : p ? ra(d, a, this.index, this.field, this.C, p) : d;
 };
-function qa(a, c, b, e, d, f) {
+function ra(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;
@@ -566,7 +597,7 @@ function qa(a, c, b, e, d, f) {
   }
   return a;
 }
-function pa(a, c) {
+function qa(a, c) {
   const b = [], e = C();
   for (let d = 0, f, g; d < a.length; d++) {
     f = a[d];
@@ -585,7 +616,7 @@ function pa(a, c) {
   }
   return b;
 }
-function na(a, c, b, e, d) {
+function oa(a, c, b, e, d) {
   let f = this.tag.get(a);
   if (!f) {
     return console.warn("Tag '" + a + "' was not found"), [];
@@ -594,43 +625,43 @@ function na(a, c, b, e, d) {
     if (a > b || e) {
       f = f.slice(e, e + b);
     }
-    d && (f = oa.call(this, f));
+    d && (f = pa.call(this, f));
     return f;
   }
 }
-function oa(a) {
+function pa(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 O(a) {
-  if (this.constructor !== O) {
-    return new O(a);
+;function Q(a) {
+  if (!this || this.constructor !== Q) {
+    return new Q(a);
   }
   const c = a.document || a.doc || a;
   var b;
   this.C = [];
   this.field = [];
   this.H = [];
-  this.key = (b = c.key || c.id) && R(b, this.H) || "id";
+  this.key = (b = c.key || c.id) && T(b, this.H) || "id";
   this.reg = (this.fastupdate = !!a.fastupdate) ? new Map() : new Set();
   this.h = (b = c.store || null) && !0 !== b && [];
   this.store = b && new Map();
-  this.cache = (b = a.cache || null) && new S(b);
+  this.cache = (b = a.cache || null) && new U(b);
   a.cache = !1;
   b = new Map();
   let e = c.index || c.field || c;
   E(e) && (e = [e]);
   for (let d = 0, f, g; d < e.length; d++) {
-    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;
+    f = e[d], E(f) || (g = f, f = f.field), g = H(g) ? Object.assign({}, a, g) : a, b.set(f, new V(g, this.reg)), g.custom ? this.C[d] = g.custom : (this.C[d] = T(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.h) {
     a = c.store;
     E(a) && (a = [a]);
     for (let d = 0, f, g; d < a.length; d++) {
-      f = a[d], g = f.field || f, f.custom ? (this.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));
+      f = a[d], g = f.field || f, f.custom ? (this.h[d] = f.custom, f.custom.S = g) : (this.h[d] = T(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;
@@ -646,14 +677,14 @@ function oa(a) {
         if (!g) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
-        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));
+        f.custom ? this.B[d] = f.custom : (this.B[d] = T(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 R(a, c) {
+function T(a, c) {
   const b = a.split(":");
   let e = 0;
   for (let d = 0; d < b.length; d++) {
@@ -662,7 +693,7 @@ function R(a, c) {
   e < b.length && (b.length = e);
   return 1 < e ? b : b[0];
 }
-x = O.prototype;
+x = Q.prototype;
 x.append = function(a, c) {
   return this.add(a, c, !0);
 };
@@ -718,28 +749,28 @@ x.set = function(a, c) {
   this.store.set(a, c);
   return this;
 };
-x.searchCache = ra;
+x.searchCache = sa;
 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);
+        return h.export(a, g, b + 1);
       });
     }
-    return this.export(a, g, b + 1, e = 0);
+    return this.export(a, g, b + 1);
   }
   let d, f;
   switch(e) {
     case 0:
       d = "reg";
-      f = ka(this.reg);
+      f = la(this.reg);
       c = null;
       break;
     case 1:
       d = "tag";
-      f = ja(this.tag);
+      f = ja(this.tag, this.reg.size);
       c = null;
       break;
     case 2:
@@ -755,33 +786,36 @@ x.export = function(a, c, b = 0, e = 0) {
     default:
       return;
   }
-  return la.call(this, a, c, d, b, e, f);
+  return P.call(this, a, c, d, f, b, e);
 };
 x.import = function(a, c) {
   if (c) {
-    switch(E(c) && (c = JSON.parse(c)), a) {
-      case "tag":
-        break;
+    E(c) && (c = JSON.parse(c));
+    a = a.split(".");
+    "json" === a[a.length - 1] && a.pop();
+    var b = 2 < a.length ? a[0] : "";
+    a = 2 < a.length ? a[2] : a[1];
+    if (b) {
+      return this.index.get(b).import(a, c);
+    }
+    switch(a) {
       case "reg":
         this.fastupdate = !1;
-        this.reg = new Set(c);
+        this.reg = ma(c, this.reg);
         for (let e = 0, d; e < this.field.length; e++) {
           d = this.index.get(this.field[e]), d.fastupdate = !1, d.reg = this.reg;
         }
         break;
-      case "doc":
-        this.store = new Map(c);
+      case "tag":
+        this.tag = ka(c, this.tag);
         break;
-      default:
-        a = a.split(".");
-        const b = a[0];
-        a = a[1];
-        b && a && this.index.get(b).import(a, c);
+      case "doc":
+        this.store = O(c, this.store);
     }
   }
 };
-ia(O.prototype);
-function ra(a, c, b) {
+ia(Q.prototype);
+function sa(a, c, b) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
   let e = this.cache.get(a);
   if (!e) {
@@ -797,57 +831,57 @@ function ra(a, c, b) {
   }
   return e;
 }
-function S(a) {
+function U(a) {
   this.limit = a && !0 !== a ? a : 1000;
   this.cache = new Map();
   this.A = "";
 }
-S.prototype.set = function(a, c) {
+U.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);
 };
-S.prototype.get = function(a) {
+U.prototype.get = function(a) {
   const c = this.cache.get(a);
   c && this.A !== a && (this.cache.delete(a), this.cache.set(this.A = a, c));
   return c;
 };
-S.prototype.remove = function(a) {
+U.prototype.remove = function(a) {
   for (const c of this.cache) {
     const b = c[0];
     c[1].includes(a) && this.cache.delete(b);
   }
 };
-S.prototype.clear = function() {
+U.prototype.clear = function() {
   this.cache.clear();
   this.A = "";
 };
-const sa = {normalize:function(a) {
+const ta = {normalize:function(a) {
   return a.toLowerCase();
 }, dedupe:!1};
-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;
-const xa = /[\x00-\x7F]+/g;
+const ua = 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 va = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), wa = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
+const xa = {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 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) {
+const za = /[\x00-\x7F]+/g;
+const Aa = /[\x00-\x7F]+/g;
+var Ba = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:ta, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:ua}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:ua, matcher:va, replacer:wa}, LatinExtra:{normalize:!0, dedupe:!0, mapper:ua, replacer:wa.concat([/(?!^)[aeo]/g, ""]), matcher:va}, 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 = 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++) {
+    let e = c.charAt(0), d = xa[e];
+    for (let f = 1, g; f < c.length && (g = c.charAt(f), "h" === g || "w" === g || !(g = xa[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(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, " ");
+}}, CjkDefault:{normalize:!1, dedupe:!0, split:"", prepare:function(a) {
+  return ("" + a).replace(za, "");
+}}, CyrillicDefault:{normalize:!1, dedupe:!0, prepare:function(a) {
+  return ("" + a).replace(Aa, " ");
 }}};
-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}}};
+const Ca = {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();
-T.prototype.add = function(a, c, b, e) {
+V.prototype.add = function(a, c, b, e) {
   if (c && (a || 0 === a)) {
     if (!e && !b && this.reg.has(a)) {
       return this.update(a, c);
@@ -859,15 +893,15 @@ T.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) : V(t, e, p), g = "";
+          var f = this.score ? this.score(c, r, p, null, 0) : W(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) : V(t, e, p, d, f);
-                    W(this, m, g, k, a, b);
+                    var k = this.score ? this.score(c, r, p, g, f) : W(t, e, p, d, f);
+                    X(this, m, g, k, a, b);
                   }
                 }
                 break;
@@ -875,24 +909,24 @@ T.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) : V(t, e, p, d, h), W(this, m, g, k, a, b);
+                  g = r[h] + g, k = this.score ? this.score(c, r, p, g, h) : W(t, e, p, d, h), X(this, m, g, k, a, b);
                 }
                 g = "";
               }
             case "forward":
               if (1 < d) {
                 for (h = 0; h < d; h++) {
-                  g += r[h], W(this, m, g, f, a, b);
+                  g += r[h], X(this, m, g, f, a, b);
                 }
                 break;
               }
             default:
-              if (W(this, m, r, f, a, b), n && 1 < e && p < e - 1) {
+              if (X(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) : 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);
+                    const u = this.score ? this.score(c, f, p, r, k) : W(g + (e / 2 > g ? 0 : 1), e, p, h - 1, k - 1), v = this.bidirectional && r > f;
+                    X(this, l, v ? f : r, u, a, b, v ? r : f);
                   }
                 }
               }
@@ -904,16 +938,16 @@ T.prototype.add = function(a, c, b, e) {
   }
   return this;
 };
-function W(a, c, b, e, d, f, g) {
+function X(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 V(a, c, b, e, d) {
+function W(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 Ba(a, c, b) {
+;function Da(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;
   }
@@ -943,7 +977,7 @@ function V(a, c, b, e, d) {
   }
   return e.length ? e = 1 < e.length ? [].concat.apply([], e) : e[0] : e;
 }
-;T.prototype.search = function(a, c, b) {
+;V.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) {
@@ -957,11 +991,11 @@ function V(a, c, b, e, d) {
   b = a.length;
   c || (c = 100);
   if (1 === b) {
-    return X.call(this, a[0], "", c, d);
+    return Y.call(this, a[0], "", c, d);
   }
   f = this.depth && !1 !== f;
   if (2 === b && f && !g) {
-    return X.call(this, a[0], a[1], c, d);
+    return Y.call(this, a[0], a[1], c, d);
   }
   var h = 0, k = 0;
   if (1 < b) {
@@ -969,7 +1003,7 @@ function V(a, c, b, e, d) {
     const n = [];
     for (let t = 0, p; t < b; t++) {
       if ((p = a[t]) && !l[p]) {
-        if (g || Y(this, p)) {
+        if (g || Z(this, p)) {
           n.push(p), l[p] = 1;
         } else {
           return e;
@@ -987,10 +1021,10 @@ function V(a, c, b, e, d) {
   }
   l = 0;
   if (1 === b) {
-    return X.call(this, a[0], "", c, d);
+    return Y.call(this, a[0], "", c, d);
   }
   if (2 === b && f && !g) {
-    return X.call(this, a[0], a[1], c, d);
+    return Y.call(this, a[0], a[1], c, d);
   }
   if (1 < b) {
     if (f) {
@@ -1002,7 +1036,7 @@ function V(a, c, b, e, d) {
   }
   for (let n, t; l < b; l++) {
     t = a[l];
-    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));
+    m ? (n = Z(this, t, m), n = Ea(n, e, g, this.P), g && !1 === n && e.length || (m = t)) : (n = Z(this, t, ""), n = Ea(n, e, g, this.resolution));
     if (n) {
       return n;
     }
@@ -1017,7 +1051,7 @@ function V(a, c, b, e, d) {
         return e;
       }
       if (1 === f) {
-        return Ba(e[0], c, d);
+        return Da(e[0], c, d);
       }
     }
   }
@@ -1076,10 +1110,10 @@ function V(a, c, b, e, d) {
   }
   return e;
 };
-function X(a, c, b, e) {
-  return (a = Y(this, a, c)) && a.length ? Ba(a, b, e) : [];
+function Y(a, c, b, e) {
+  return (a = Z(this, a, c)) && a.length ? Da(a, b, e) : [];
 }
-function Ca(a, c, b, e) {
+function Ea(a, c, b, e) {
   let d = [];
   if (a) {
     e = Math.min(a.length, e);
@@ -1093,13 +1127,13 @@ function Ca(a, c, b, e) {
   }
   return !b && d;
 }
-function Y(a, c, b) {
+function Z(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) {
+;V.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) {
@@ -1114,14 +1148,14 @@ function Y(a, c, b) {
         }
       }
     } else {
-      Z(this.map, a), this.depth && Z(this.ctx, a);
+      Fa(this.map, a), this.depth && Fa(this.ctx, a);
     }
     c || this.reg.delete(a);
   }
   this.cache && this.cache.remove(a);
   return this;
 };
-function Z(a, c) {
+function Fa(a, c) {
   let b = 0;
   if (a.constructor === Array) {
     for (let e = 0, d, f; e < a.length; e++) {
@@ -1136,24 +1170,24 @@ function Z(a, c) {
     }
   } else {
     for (let e of a) {
-      const d = e[0], f = Z(e[1], c);
+      const d = e[0], f = Fa(e[1], c);
       f ? b += f : a.delete(d);
     }
   }
   return b;
 }
-;function T(a, c) {
-  if (this.constructor !== T) {
-    return new T(a);
+;function V(a, c) {
+  if (!this || this.constructor !== V) {
+    return new V(a);
   }
   if (a) {
     var b = E(a) ? a : a.preset;
-    b && (Aa[b] || console.warn("Preset not found: " + b), a = Object.assign({}, Aa[b], a));
+    b && (Ca[b] || console.warn("Preset not found: " + b), a = Object.assign({}, Ca[b], a));
   } else {
     a = {};
   }
   b = a.context || {};
-  const e = E(a.encoder) ? za[a.encoder] : a.encode || a.encoder || sa;
+  const e = E(a.encoder) ? Ba[a.encoder] : a.encode || a.encoder || ta;
   this.encoder = e.encode ? e : "object" === typeof e ? new K(e) : {encode:e};
   let d;
   this.resolution = a.resolution || 9;
@@ -1168,9 +1202,9 @@ function Z(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 S(d);
+  this.cache = (d = a.cache || null) && new U(d);
 }
-x = T.prototype;
+x = V.prototype;
 x.clear = function() {
   this.map.clear();
   this.ctx.clear();
@@ -1188,7 +1222,7 @@ 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 Da(a) {
+function Ga(a) {
   let c = 0;
   if (a.constructor === Array) {
     for (let b = 0, e; b < a.length; b++) {
@@ -1196,7 +1230,7 @@ function Da(a) {
     }
   } else {
     for (const b of a) {
-      const e = b[0], d = Da(b[1]);
+      const e = b[0], d = Ga(b[1]);
       d ? c += d : a.delete(e);
     }
   }
@@ -1206,17 +1240,17 @@ x.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
-  Da(this.map);
-  this.depth && Da(this.ctx);
+  Ga(this.map);
+  this.depth && Ga(this.ctx);
   return this;
 };
-x.searchCache = ra;
+x.searchCache = sa;
 x.export = function(a, c, b, e = 0) {
   let d, f;
   switch(e) {
     case 0:
       d = "reg";
-      f = ka(this.reg);
+      f = la(this.reg);
       break;
     case 1:
       d = "cfg";
@@ -1224,29 +1258,29 @@ x.export = function(a, c, b, e = 0) {
       break;
     case 2:
       d = "map";
-      f = N(this.map);
+      f = N(this.map, this.reg.size);
       break;
     case 3:
       d = "ctx";
-      f = ja(this.ctx);
+      f = ja(this.ctx, this.reg.size);
       break;
     default:
       return;
   }
-  return la.call(this, a, c, d, b, e, f);
+  return P.call(this, a, c, d, f, b, e);
 };
 x.import = function(a, c) {
   if (c) {
-    switch(E(c) && (c = JSON.parse(c)), a) {
+    switch(E(c) && (c = JSON.parse(c)), a = a.split("."), "json" === a[a.length - 1] && a.pop(), a = 1 < a.length ? a[1] : a[0], a) {
       case "reg":
         this.fastupdate = !1;
-        this.reg = new Set(c);
+        this.reg = ma(c, this.reg);
         break;
       case "map":
-        this.map = new Map(c);
+        this.map = O(c, this.map);
         break;
       case "ctx":
-        this.ctx = new Map(c);
+        this.ctx = ka(c, this.ctx);
     }
   }
 };
@@ -1300,7 +1334,7 @@ x.serialize = function(a = !0) {
   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:{}};
+ia(V.prototype);
+export default {Index:V, Charset:Ba, Encoder:K, Document:Q, 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
+export const Index=V;export const  Charset=Ba;export const  Encoder=K;export const  Document=Q;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 04c5911..d4b46d5 100644
--- a/dist/flexsearch.compact.module.min.js
+++ b/dist/flexsearch.compact.module.min.js
@@ -5,48 +5,51 @@
  * Hosted by Nextapps GmbH
  * https://github.com/nextapps-de/flexsearch
  */
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+var x;function B(a,b,c){const e=typeof c,d=typeof a;if("undefined"!==e){if("undefined"!==d){if(c){if("function"===d&&e===d)return function(h){return a(c(h))};b=a.constructor;if(b===c.constructor){if(b===Array)return c.concat(a);if(b===Map){var g=new Map(c);for(var f of a)g.set(f[0],f[1]);return g}if(b===Set){f=new Set(c);for(g of a.values())f.add(g);return f}}}return a}return c}return"undefined"===d?b:a}function D(){return Object.create(null)}function aa(a,b){return b.length-a.length}
+function E(a){return"string"===typeof a}function G(a){return"object"===typeof a}function I(a,b){if(E(b))a=a[b];else for(let c=0;a&&c<b.length;c++)a=a[b[c]];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",
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 ["\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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+x.clear=function(){for(const a of this.index.values())a.clear();if(this.tag)for(const a of this.tag.values())a.clear();this.store&&this.store.clear();return this};x.contain=function(a){return this.reg.has(a)};x.cleanup=function(){for(const a of this.index.values())a.cleanup();return this};x.get=function(a){return this.store.get(a)};x.set=function(a,b){this.store.set(a,b);return this};x.searchCache=sa;
+x.export=function(a,b,c=0,e=0){if(c<this.field.length){const f=this.field[c];if((b=this.index.get(f).export(a,f,c,e=1))&&b.then){const h=this;return b.then(function(){return h.export(a,f,c+1)})}return this.export(a,f,c+1)}let d,g;switch(e){case 0:d="reg";g=la(this.reg);b=null;break;case 1:d="tag";g=ja(this.tag,this.reg.size);b=null;break;case 2:d="doc";g=N(this.store);b=null;break;case 3:d="cfg";g={};b=null;break;default:return}return P.call(this,a,b,d,g,c,e)};
+x.import=function(a,b){if(b){E(b)&&(b=JSON.parse(b));a=a.split(".");"json"===a[a.length-1]&&a.pop();var c=2<a.length?a[0]:"";a=2<a.length?a[2]:a[1];if(c)return this.index.get(c).import(a,b);switch(a){case "reg":this.fastupdate=!1;this.reg=ma(b,this.reg);for(let e=0,d;e<this.field.length;e++)d=this.index.get(this.field[e]),d.fastupdate=!1,d.reg=this.reg;break;case "tag":this.tag=ka(b,this.tag);break;case "doc":this.store=O(b,this.store)}}};ia(Q.prototype);function sa(a,b,c){a=("object"===typeof a?""+a.query:a).toLowerCase();let e=this.cache.get(a);if(!e){e=this.search(a,b,c);if(e.then){const d=this;e.then(function(g){d.cache.set(a,g);return g})}this.cache.set(a,e)}return e}function U(a){this.limit=a&&!0!==a?a:1E3;this.cache=new Map;this.A=""}U.prototype.set=function(a,b){this.cache.set(this.A=a,b);this.cache.size>this.limit&&this.cache.delete(this.cache.keys().next().value)};
+U.prototype.get=function(a){const b=this.cache.get(a);b&&this.A!==a&&(this.cache.delete(a),this.cache.set(this.A=a,b));return b};U.prototype.remove=function(a){for(const b of this.cache){const c=b[0];b[1].includes(a)&&this.cache.delete(c)}};U.prototype.clear=function(){this.cache.clear();this.A=""};const ta={normalize:function(a){return a.toLowerCase()},dedupe:!1};const ua=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 va=new Map([["ae","a"],["oe","o"],["sh","s"],["kh","k"],["th","t"],["pf","f"]]),wa=[/([^aeo])h(.)/g,"$1$2",/([aeo])h([^aeo]|$)/g,"$1$2",/([^0-9])\1+/g,"$1"];const xa={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 ya=/[\x00-\x7F]+/g;const za=/[\x00-\x7F]+/g;const Aa=/[\x00-\x7F]+/g;var Ba={LatinExact:{normalize:!1,dedupe:!1},LatinDefault:ta,LatinSimple:{normalize:!0,dedupe:!0},LatinBalance:{normalize:!0,dedupe:!0,mapper:ua},LatinAdvanced:{normalize:!0,dedupe:!0,mapper:ua,matcher:va,replacer:wa},LatinExtra:{normalize:!0,dedupe:!0,mapper:ua,replacer:wa.concat([/(?!^)[aeo]/g,""]),matcher:va},LatinSoundex:{normalize:!0,dedupe:!1,include:{letter:!0},finalize:function(a){for(let c=0;c<a.length;c++){var b=a[c];let e=b.charAt(0),d=xa[e];for(let g=1,f;g<b.length&&(f=b.charAt(g),"h"===
+f||"w"===f||!(f=xa[f])||f===d||(e+=f,d=f,4!==e.length));g++);a[c]=e}}},ArabicDefault:{rtl:!0,normalize:!1,dedupe:!0,prepare:function(a){return(""+a).replace(ya," ")}},CjkDefault:{normalize:!1,dedupe:!0,split:"",prepare:function(a){return(""+a).replace(za,"")}},CyrillicDefault:{normalize:!1,dedupe:!0,prepare:function(a){return(""+a).replace(Aa," ")}}};const Ca={memory:{resolution:1},performance:{resolution:6,fastupdate:!0,context:{depth:1,resolution:3}},match:{tokenize:"forward"},score:{resolution:9,context:{depth:2,resolution:9}}};D();V.prototype.add=function(a,b,c,e){if(b&&(a||0===a)){if(!e&&!c&&this.reg.has(a))return this.update(a,b);b=this.encoder.encode(b);if(e=b.length){const l=D(),m=D(),n=this.depth,t=this.resolution;for(let p=0;p<e;p++){let r=b[this.rtl?e-1-p:p];var d=r.length;if(d&&(n||!m[r])){var g=this.score?this.score(b,r,p,null,0):W(t,e,p),f="";switch(this.tokenize){case "full":if(2<d){for(g=0;g<d;g++)for(var h=d;h>g;h--){f=r.substring(g,h);var k=this.score?this.score(b,r,p,f,g):W(t,e,p,d,g);X(this,m,f,k,a,c)}break}case "reverse":if(1<
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+function X(a,b,c,e,d,g,f){let h=f?a.ctx:a.map,k;if(!b[c]||f&&!(k=b[c])[f])f?(b=k||(b[c]=D()),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=[]),h=h[e]||(h[e]=[]),g&&h.includes(d)||(h.push(d),a.fastupdate&&((b=a.reg.get(d))?b.push(h):a.reg.set(d,[h])))}function W(a,b,c,e,d){return c&&1<a?b+(e||0)<=a?c+(d||0):(a-1)/(b+(e||0))*(c+(d||0))+1|0:0};function Da(a,b,c){if(1===a.length)return a=a[0],a=c||a.length>b?b?a.slice(c,c+b):a.slice(c):a;let e=[];for(let d=0,g,f;d<a.length;d++)if((g=a[d])&&(f=g.length)){if(c){if(c>=f){c-=f;continue}c<f&&(g=b?g.slice(c,c+b):g.slice(c),f=g.length,c=0)}if(e.length)f>b&&(g=g.slice(0,b),f=g.length),e.push(g);else{if(f>=b)return f>b&&(g=g.slice(0,b)),g;e=[g]}b-=f;if(!b)break}return e.length?e=1<e.length?[].concat.apply([],e):e[0]:e};V.prototype.search=function(a,b,c){c||(!b&&G(a)?(c=a,a=""):G(b)&&(c=b,b=0));var e=[],d=0;if(c){a=c.query||a;b=c.limit||b;d=c.offset||0;var g=c.context;var f=c.suggest}a=this.encoder.encode(a);c=a.length;b||(b=100);if(1===c)return Y.call(this,a[0],"",b,d);g=this.depth&&!1!==g;if(2===c&&g&&!f)return Y.call(this,a[0],a[1],b,d);var h=0,k=0;if(1<c){var l=D();const n=[];for(let t=0,p;t<c;t++)if((p=a[t])&&!l[p]){if(f||Z(this,p))n.push(p),l[p]=1;else return e;const r=p.length;h=Math.max(h,r);k=k?Math.min(k,
+r):r}a=n;c=a.length}if(!c)return e;l=0;if(1===c)return Y.call(this,a[0],"",b,d);if(2===c&&g&&!f)return Y.call(this,a[0],a[1],b,d);if(1<c)if(g){var m=a[0];l=1}else 9<h&&3<h/k&&a.sort(aa);for(let n,t;l<c;l++){t=a[l];m?(n=Z(this,t,m),n=Ea(n,e,f,this.P),f&&!1===n&&e.length||(m=t)):(n=Z(this,t,""),n=Ea(n,e,f,this.resolution));if(n)return n;if(f&&l===c-1){g=e.length;if(!g){if(m){m="";l=-1;continue}return e}if(1===g)return Da(e[0],b,d)}}a:{a=e;e=this.resolution;m=f;c=a.length;f=[];g=D();for(let n=0,t,p,
+r,v;n<e;n++)for(k=0;k<c;k++)if(r=a[k],n<r.length&&(t=r[n]))for(l=0;l<t.length;l++)p=t[l],(h=g[p])?g[p]++:(h=0,g[p]=1),v=f[h]||(f[h]=[]),v.push(p);if(a=f.length)if(m){if(1<f.length)b:for(a=[],e=D(),m=f.length,h=m-1;0<=h;h--)for(m=f[h],g=m.length,k=0;k<g;k++){if(c=m[k],!e[c])if(e[c]=1,d)d--;else if(a.push(c),a.length===b)break b}else a=(f=f[0]).length>b||d?f.slice(d,b+d):f;f=a}else{if(a<c){e=[];break a}f=f[a-1];if(b||d)if(f.length>b||d)f=f.slice(d,b+d)}e=f}return e};
+function Y(a,b,c,e){return(a=Z(this,a,b))&&a.length?Da(a,c,e):[]}function Ea(a,b,c,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){b.push(d);return}}return!c&&d}function Z(a,b,c){let e;c&&(e=a.bidirectional&&b>c);a=c?(a=a.ctx.get(e?b:c))&&a.get(e?c:b):a.map.get(b);return a};V.prototype.remove=function(a,b){const c=this.reg.size&&(this.fastupdate?this.reg.get(a):this.reg.has(a));if(c){if(this.fastupdate)for(let e=0,d;e<c.length;e++){if(d=c[e])if(2>d.length)d.pop();else{const g=d.indexOf(a);g===c.length-1?d.pop():d.splice(g,1)}}else Fa(this.map,a),this.depth&&Fa(this.ctx,a);b||this.reg.delete(a)}this.cache&&this.cache.remove(a);return this};
+function Fa(a,b){let c=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(b),0<=g){1<d.length?(d.splice(g,1),c++):delete a[e];break}else c++}else for(let e of a){const d=e[0],g=Fa(e[1],b);g?c+=g:a.delete(d)}return c};function V(a,b){if(!this||this.constructor!==V)return new V(a);if(a){var c=E(a)?a:a.preset;c&&(a=Object.assign({},Ca[c],a))}else a={};c=a.context||{};const e=E(a.encoder)?Ba[a.encoder]:a.encode||a.encoder||ta;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&&c.depth||0;this.bidirectional=!1!==c.bidirectional;this.fastupdate=!!a.fastupdate;this.score=a.score||null;d=!1;this.map=new Map;
+this.ctx=new Map;this.reg=b||(this.fastupdate?new Map:new Set);this.P=c.resolution||1;this.rtl=e.rtl||a.rtl||!1;this.cache=(d=a.cache||null)&&new U(d)}x=V.prototype;x.clear=function(){this.map.clear();this.ctx.clear();this.reg.clear();this.cache&&this.cache.clear();return this};x.append=function(a,b){return this.add(a,b,!0)};x.contain=function(a){return this.reg.has(a)};x.update=function(a,b){const c=this,e=this.remove(a);return e&&e.then?e.then(()=>c.add(a,b)):this.add(a,b)};
+function Ga(a){let b=0;if(a.constructor===Array)for(let c=0,e;c<a.length;c++)(e=a[c])&&(b+=e.length);else for(const c of a){const e=c[0],d=Ga(c[1]);d?b+=d:a.delete(e)}return b}x.cleanup=function(){if(!this.fastupdate)return this;Ga(this.map);this.depth&&Ga(this.ctx);return this};x.searchCache=sa;
+x.export=function(a,b,c,e=0){let d,g;switch(e){case 0:d="reg";g=la(this.reg);break;case 1:d="cfg";g={};break;case 2:d="map";g=N(this.map,this.reg.size);break;case 3:d="ctx";g=ja(this.ctx,this.reg.size);break;default:return}return P.call(this,a,b,d,g,c,e)};
+x.import=function(a,b){if(b)switch(E(b)&&(b=JSON.parse(b)),a=a.split("."),"json"===a[a.length-1]&&a.pop(),a=1<a.length?a[1]:a[0],a){case "reg":this.fastupdate=!1;this.reg=ma(b,this.reg);break;case "map":this.map=O(b,this.map);break;case "ctx":this.ctx=ka(b,this.ctx)}};
+x.serialize=function(a=!0){if(!this.reg.size)return"";let b="",c="";for(var e of this.reg.keys())c||(c=typeof e),b+=(b?",":"")+("string"===c?'"'+e+'"':e);b="index.reg=new Set(["+b+"]);";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"===c?'"'+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"===c?'"'+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){"+b+e+d+"}":b+e+d};ia(V.prototype);export default {Index:V,Charset:Ba,Encoder:K,Document:Q,Worker:null,Resolver:null,IndexedDB:null,Language:{}};
+export const Index=V;export const Charset=Ba;export const Encoder=K;export const Document=Q;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 0b471fe..3596d0a 100644
--- a/dist/flexsearch.es5.debug.js
+++ b/dist/flexsearch.es5.debug.js
@@ -907,9 +907,9 @@ function Aa(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 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;
+var Ca = /[^\p{L}\p{N}]+/u, Da = /(\d{3})/g, Ea = /(\D)(\d{3})/g, Fa = /(\d{3})(\D)/g, Ha = "".normalize && /[\u0300-\u036f]/g;
 function N(a) {
-  if (this.constructor !== N) {
+  if (!this || this.constructor !== N) {
     var b = Function.prototype.bind, c = b.apply, d = [null], e = d.concat;
     if (arguments instanceof Array) {
       var g = arguments;
@@ -998,7 +998,7 @@ N.prototype.encode = function(a) {
   }
   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(Fa, "$1 $2").replace(Ga, "$1 $2").replace(Da, "$1 "));
+  this.numeric && 3 < a.length && (a = a.replace(Ea, "$1 $2").replace(Fa, "$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) {
@@ -1096,7 +1096,7 @@ function R(a) {
     }
   }
   a = void 0 === a ? {} : a;
-  if (this.constructor !== R) {
+  if (!this || this.constructor !== R) {
     return new R(a);
   }
   var c = "undefined" !== typeof self ? self._factory : "undefined" !== typeof window ? window._factory : null;
@@ -1150,40 +1150,73 @@ function Oa(a) {
     return b;
   };
 }
-;function Pa(a) {
-  var b = [];
+;function Pa(a, b) {
+  b = void 0 === b ? 0 : b;
+  var c = [], d = [];
+  b && (b = 250000 / b * 5000 | 0);
   a = y(a.entries());
-  for (var c = a.next(); !c.done; c = a.next()) {
-    b.push(c.value);
+  for (var e = a.next(); !e.done; e = a.next()) {
+    d.push(e.value), d.length === b && (c.push(d), d = []);
+  }
+  d.length && c.push(d);
+  return c;
+}
+function Qa(a, b) {
+  b || (b = new Map());
+  for (var c = 0, d; c < a.length; c++) {
+    d = a[c], b.set(d[0], d[1]);
   }
   return b;
 }
-function Qa(a) {
-  var b = [];
+function Ra(a, b) {
+  b = void 0 === b ? 0 : b;
+  var c = [], d = [];
+  b && (b = 250000 / b * 1000 | 0);
   a = y(a.entries());
-  for (var c = a.next(); !c.done; c = a.next()) {
-    b.push(Pa(c.value));
+  for (var e = a.next(); !e.done; e = a.next()) {
+    e = e.value, d.push([e[0], Pa(e[1])[0]]), d.length === b && (c.push(d), d = []);
+  }
+  d.length && c.push(d);
+  return c;
+}
+function Sa(a, b) {
+  b || (b = new Map());
+  for (var c = 0, d, e; c < a.length; c++) {
+    d = a[c], e = b.get(d[0]), b.set(d[0], Qa(d[1], e));
   }
   return b;
 }
-function Ra(a) {
-  var b = [];
+function Ta(a) {
+  var b = [], c = [];
   a = y(a.keys());
-  for (var c = a.next(); !c.done; c = a.next()) {
-    b.push(c.value);
+  for (var d = a.next(); !d.done; d = a.next()) {
+    c.push(d.value), 250000 === c.length && (b.push(c), c = []);
+  }
+  c.length && b.push(c);
+  return b;
+}
+function Ua(a, b) {
+  b || (b = new Set());
+  for (var c = 0; c < a.length; c++) {
+    b.add(a[c]);
   }
   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);
+function Va(a, b, c, d, e, g, f) {
+  f = void 0 === f ? 0 : f;
+  var h = d && d.constructor === Array, k = h ? d.shift() : d;
+  if (!k) {
+    return this.export(a, b, e, g + 1);
+  }
+  if ((k = a((b ? b + "." : "") + (f + 1) + "." + c, JSON.stringify(k))) && k.then) {
+    var l = this;
+    return k.then(function() {
+      return Va.call(l, a, b, c, h ? d : null, e, g, f + 1);
     });
   }
-  return this.export(a, b, d, e + 1);
+  return Va.call(this, a, b, c, h ? d : null, e, g, f + 1);
 }
-;function Ta(a, b, c, d) {
+;function Wa(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;
@@ -1248,12 +1281,12 @@ function S(a) {
     }
     if ("slice" === d) {
       return function(e, g) {
-        return Ta(b, e || 0, g || b.length, !1);
+        return Wa(b, e || 0, g || b.length, !1);
       };
     }
     if ("splice" === d) {
       return function(e, g) {
-        return Ta(b, e || 0, g || b.length, !0);
+        return Wa(b, e || 0, g || b.length, !0);
       };
     }
     if ("constructor" === d) {
@@ -1285,7 +1318,7 @@ function T(a) {
   this.index = J();
   this.B = [];
   this.size = 0;
-  32 < a ? (this.h = Ua, this.A = BigInt(a)) : (this.h = Va, this.A = a);
+  32 < a ? (this.h = Xa, this.A = BigInt(a)) : (this.h = Ya, this.A = a);
 }
 T.prototype.get = function(a) {
   var b = this.h(a);
@@ -1302,7 +1335,7 @@ function U(a) {
   }
   this.index = J();
   this.h = [];
-  32 < a ? (this.B = Ua, this.A = BigInt(a)) : (this.B = Va, this.A = a);
+  32 < a ? (this.B = Xa, this.A = BigInt(a)) : (this.B = Ya, this.A = a);
 }
 U.prototype.add = function(a) {
   var b = this.B(a), c = this.index[b];
@@ -1322,9 +1355,9 @@ v.clear = U.prototype.clear = function() {
   this.h = [];
   this.size = 0;
 };
-v.values = U.prototype.values = function Wa() {
+v.values = U.prototype.values = function Za() {
   var b, c = this, d, e, g;
-  return ra(Wa, function(f) {
+  return ra(Za, function(f) {
     switch(f.h) {
       case 1:
         b = 0;
@@ -1348,9 +1381,9 @@ v.values = U.prototype.values = function Wa() {
     }
   });
 };
-v.keys = U.prototype.keys = function Xa() {
+v.keys = U.prototype.keys = function $a() {
   var b, c = this, d, e, g;
-  return ra(Xa, function(f) {
+  return ra($a, function(f) {
     switch(f.h) {
       case 1:
         b = 0;
@@ -1374,9 +1407,9 @@ v.keys = U.prototype.keys = function Xa() {
     }
   });
 };
-v.entries = U.prototype.entries = function Ya() {
+v.entries = U.prototype.entries = function ab() {
   var b, c = this, d, e, g;
-  return ra(Ya, function(f) {
+  return ra(ab, function(f) {
     switch(f.h) {
       case 1:
         b = 0;
@@ -1400,7 +1433,7 @@ v.entries = U.prototype.entries = function Ya() {
     }
   });
 };
-function Va(a) {
+function Ya(a) {
   var b = Math.pow(2, this.A) - 1;
   if ("number" == typeof a) {
     return a & b;
@@ -1410,7 +1443,7 @@ function Va(a) {
   }
   return 32 === this.A ? c + Math.pow(2, 31) : c;
 }
-function Ua() {
+function Xa() {
   throw Error("The keystore is limited to 32 for EcmaScript5");
 }
 ;V.prototype.add = function(a, b, c) {
@@ -1427,7 +1460,7 @@ function Ua() {
       } else {
         var f = e.R;
         if (!f || f(b)) {
-          e.constructor === String ? e = ["" + e] : K(e) && (e = [e]), Za(b, e, this.T, 0, g, a, e[0], c);
+          e.constructor === String ? e = ["" + e] : K(e) && (e = [e]), bb(b, e, this.T, 0, g, a, e[0], c);
         }
       }
     }
@@ -1492,7 +1525,7 @@ function Ua() {
               q[d] = b[d];
               continue;
             }
-            $a(b, q, d, 0, d[0], g);
+            cb(b, q, d, 0, d[0], g);
           }
         }
       }
@@ -1501,21 +1534,21 @@ function Ua() {
   }
   return this;
 };
-function $a(a, b, c, d, e, g) {
+function cb(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++) {
-        $a(a, b, c, d, e);
+        cb(a, b, c, d, e);
       }
     } else {
-      b = b[e] || (b[e] = J()), e = c[++d], $a(a, b, c, d, e);
+      b = b[e] || (b[e] = J()), e = c[++d], cb(a, b, c, d, e);
     }
   }
 }
-function Za(a, b, c, d, e, g, f, h) {
+function bb(a, b, c, d, e, g, f, h) {
   if (a = a[f]) {
     if (d === b.length - 1) {
       if (a.constructor === Array) {
@@ -1531,17 +1564,17 @@ function Za(a, b, c, d, e, g, f, h) {
     } else {
       if (a.constructor === Array) {
         for (f = 0; f < a.length; f++) {
-          Za(a, b, c, d, e, g, f, h);
+          bb(a, b, c, d, e, g, f, h);
         }
       } else {
-        f = b[++d], Za(a, b, c, d, e, g, f, h);
+        f = b[++d], bb(a, b, c, d, e, g, f, h);
       }
     }
   } else {
     e.db && e.remove(g);
   }
 }
-;function ab(a, b, c, d, e, g, f) {
+;function db(a, b, c, d, e, g, f) {
   var h = a.length, k = [], l;
   var m = J();
   for (var n = 0, p = void 0, q; n < b; n++) {
@@ -1562,7 +1595,7 @@ function Za(a, b, c, d, e, g, f, h) {
   }
   if (a = k.length) {
     if (e) {
-      k = 1 < k.length ? bb(k, d, c, f, 0) : (k = k[0]).length > c || d ? k.slice(d, c + d) : k;
+      k = 1 < k.length ? eb(k, d, c, f, 0) : (k = k[0]).length > c || d ? k.slice(d, c + d) : k;
     } else {
       if (a < h) {
         return [];
@@ -1595,7 +1628,7 @@ function Za(a, b, c, d, e, g, f, h) {
   }
   return k;
 }
-function bb(a, b, c, d, e) {
+function eb(a, b, c, d, e) {
   var g = [], f = J(), h = a.length, k = 0;
   if (d) {
     for (e = h - 1; 0 <= e; e--) {
@@ -1637,7 +1670,7 @@ function bb(a, b, c, d, e) {
   }
   return g;
 }
-function cb(a, b) {
+function fb(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++) {
@@ -1712,7 +1745,7 @@ function cb(a, b) {
               }
               g.push(p = p.db.tag(u[h + 1], b, r, n));
             } else {
-              p = db.call(this, u[h], u[h + 1], b, r, n);
+              p = gb.call(this, u[h], u[h + 1], b, r, n);
             }
             e.push({field:u[h], tag:u[h + 1], result:p});
           }
@@ -1772,7 +1805,7 @@ function cb(a, b) {
           }
         } else {
           D = 0;
-          for (var Lb = L = void 0; D < m.length; D += 2) {
+          for (var Ob = 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) {
@@ -1781,7 +1814,7 @@ function cb(a, b) {
                 return e;
               }
             }
-            if (Lb = (L = L && L.get(m[D + 1])) && L.length) {
+            if (Ob = (L = L && L.get(m[D + 1])) && L.length) {
               B++, A.push(L);
             } else if (!p) {
               return e;
@@ -1789,7 +1822,7 @@ function cb(a, b) {
           }
         }
         if (B) {
-          t = cb(t, A);
+          t = fb(t, A);
           z = t.length;
           if (!z && !p) {
             return e;
@@ -1818,9 +1851,9 @@ function cb(a, b) {
         u.push(g.db.tag(m[n + 1], b, r, !1));
       }
     }
-    var Mb = this;
+    var Pb = this;
     return Promise.all(u).then(function(P) {
-      return P.length ? Mb.search(a, b, c, P) : P;
+      return P.length ? Pb.search(a, b, c, P) : P;
     });
   }
   if (!f) {
@@ -1833,24 +1866,24 @@ function cb(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 = eb.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 = hb.call(this, p)));
     if (h) {
       return p;
     }
     e[r] = {field:g[r], result:p};
   }
   if (n && this.db && u.length) {
-    var Ea = this;
+    var Ga = this;
     return Promise.all(u).then(function(P) {
       for (var Q = 0; Q < P.length; Q++) {
         e[Q].result = P[Q];
       }
-      return k ? fb(e, b) : q ? gb(e, a, Ea.index, Ea.field, Ea.I, q) : e;
+      return k ? ib(e, b) : q ? jb(e, a, Ga.index, Ga.field, Ga.I, q) : e;
     });
   }
-  return k ? fb(e, b) : q ? gb(e, a, this.index, this.field, this.I, q) : e;
+  return k ? ib(e, b) : q ? jb(e, a, this.index, this.field, this.I, q) : e;
 };
-function gb(a, b, c, d, e, g) {
+function jb(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 = za(m[p].doc, n), u = f.encode(r);
@@ -1881,7 +1914,7 @@ function gb(a, b, c, d, e, g) {
   }
   return a;
 }
-function fb(a, b) {
+function ib(a, b) {
   for (var c = [], d = J(), e = 0, g, f; e < a.length; e++) {
     g = a[e];
     f = g.result;
@@ -1899,7 +1932,7 @@ function fb(a, b) {
   }
   return c;
 }
-function db(a, b, c, d, e) {
+function gb(a, b, c, d, e) {
   var g = this.tag.get(a);
   if (!g) {
     return console.warn("Tag '" + a + "' was not found"), [];
@@ -1908,25 +1941,25 @@ function db(a, b, c, d, e) {
     if (a > c || d) {
       g = g.slice(d, d + c);
     }
-    e && (g = eb.call(this, g));
+    e && (g = hb.call(this, g));
     return g;
   }
 }
-function eb(a) {
+function hb(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.constructor !== V) {
+  if (!this || 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) && hb(c, this.T) || "id";
+  this.key = (c = b.key || b.id) && kb(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 && [];
@@ -1934,7 +1967,7 @@ function eb(a) {
   this.cache = (c = a.cache || null) && new W(c);
   a.cache = !1;
   this.worker = a.worker;
-  this.index = ib.call(this, a, b);
+  this.index = lb.call(this, a, b);
   this.tag = null;
   if (c = b.tag) {
     if ("string" === typeof c && (c = [c]), c.length) {
@@ -1948,7 +1981,7 @@ function eb(a) {
         if (!e) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
-        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));
+        d.custom ? this.M[b] = d.custom : (this.M[b] = kb(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());
       }
@@ -2024,7 +2057,7 @@ v.destroy = function() {
   }
   return Promise.all(a);
 };
-function ib(a, b) {
+function lb(a, b) {
   var c = new Map(), d = b.index || b.field || b;
   K(d) && (d = [d]);
   for (var e = 0, g, f = void 0; e < d.length; e++) {
@@ -2036,17 +2069,17 @@ function ib(a, b) {
       c.set(g, h);
     }
     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));
+    f.custom ? this.I[e] = f.custom : (this.I[e] = kb(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, 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));
+      d = a[b], e = d.field || d, d.custom ? (this.H[b] = d.custom, d.custom.la = e) : (this.H[b] = kb(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 hb(a, b) {
+function kb(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);
   }
@@ -2113,7 +2146,7 @@ v.set = function(a, b) {
   this.store.set(a, b);
   return this;
 };
-v.searchCache = jb;
+v.searchCache = mb;
 v.export = function(a, b, c, d) {
   c = void 0 === c ? 0 : c;
   d = void 0 === d ? 0 : d;
@@ -2122,20 +2155,20 @@ v.export = function(a, b, c, d) {
     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);
+        return g.export(a, e, c + 1);
       });
     }
-    return this.export(a, e, c + 1, d = 0);
+    return this.export(a, e, c + 1);
   }
   switch(d) {
     case 0:
       var f = "reg";
-      var h = Ra(this.reg);
+      var h = Ta(this.reg);
       b = null;
       break;
     case 1:
       f = "tag";
-      h = Qa(this.tag);
+      h = Ra(this.tag, this.reg.size);
       b = null;
       break;
     case 2:
@@ -2151,33 +2184,36 @@ v.export = function(a, b, c, d) {
     default:
       return;
   }
-  return Sa.call(this, a, b, f, c, d, h);
+  return Va.call(this, a, b, f, h, c, d);
 };
 v.import = function(a, b) {
   if (b) {
-    switch(K(b) && (b = JSON.parse(b)), a) {
-      case "tag":
-        break;
+    K(b) && (b = JSON.parse(b));
+    a = a.split(".");
+    "json" === a[a.length - 1] && a.pop();
+    var c = 2 < a.length ? a[0] : "";
+    a = 2 < a.length ? a[2] : a[1];
+    if (c) {
+      return this.index.get(c).import(a, b);
+    }
+    switch(a) {
       case "reg":
         this.fastupdate = !1;
-        this.reg = new Set(b);
+        this.reg = Ua(b, this.reg);
         for (a = 0; a < this.field.length; a++) {
           b = this.index.get(this.field[a]), b.fastupdate = !1, b.reg = this.reg;
         }
         break;
-      case "doc":
-        this.store = new Map(b);
+      case "tag":
+        this.tag = Sa(b, this.tag);
         break;
-      default:
-        a = a.split(".");
-        var c = a[0];
-        a = a[1];
-        c && a && this.index.get(c).import(a, b);
+      case "doc":
+        this.store = Qa(b, this.store);
     }
   }
 };
 Na(V.prototype);
-function jb(a, b, c) {
+function mb(a, b, c) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
   var d = this.cache.get(a);
   if (!d) {
@@ -2218,29 +2254,29 @@ W.prototype.clear = function() {
   this.cache.clear();
   this.h = "";
 };
-var kb = {normalize:function(a) {
+var nb = {normalize:function(a) {
   return a.toLowerCase();
 }, dedupe:!1};
-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) {
+var ob = 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 pb = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), qb = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
+var rb = {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 sb = /[\x00-\x7F]+/g;
+var tb = /[\x00-\x7F]+/g;
+var ub = /[\x00-\x7F]+/g;
+var vb = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:nb, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:ob}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:ob, matcher:pb, replacer:qb}, LatinExtra:{normalize:!0, dedupe:!0, mapper:ob, replacer:qb.concat([/(?!^)[aeo]/g, ""]), matcher:pb}, 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 = 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++) {
+    for (var c = a[b], d = c.charAt(0), e = rb[d], g = 1, f; g < c.length && (f = c.charAt(g), "h" === f || "w" === f || !(f = rb[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(pb, " ");
+  return ("" + a).replace(sb, " ");
 }}, CjkDefault:{normalize:!1, dedupe:!0, split:"", prepare:function(a) {
-  return ("" + a).replace(qb, "");
+  return ("" + a).replace(tb, "");
 }}, CyrillicDefault:{normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(rb, " ");
+  return ("" + a).replace(ub, " ");
 }}};
-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}}};
+var wb = {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)) {
@@ -2252,15 +2288,15 @@ O.prototype.add = function(a, b, c, d) {
       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) : ub(h, d, k), p = "";
+          var n = this.score ? this.score(b, l, k, null, 0) : xb(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) : ub(h, d, k, m, n);
-                    vb(this, g, p, r, a, c);
+                    var r = this.score ? this.score(b, l, k, p, n) : xb(h, d, k, m, n);
+                    yb(this, g, p, r, a, c);
                   }
                 }
                 break;
@@ -2268,24 +2304,24 @@ O.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) : ub(h, d, k, m, q), vb(this, g, p, r, a, c);
+                  p = l[q] + p, r = this.score ? this.score(b, l, k, p, q) : xb(h, d, k, m, q), yb(this, g, p, r, a, c);
                 }
                 p = "";
               }
             case "forward":
               if (1 < m) {
                 for (q = 0; q < m; q++) {
-                  p += l[q], vb(this, g, p, n, a, c);
+                  p += l[q], yb(this, g, p, n, a, c);
                 }
                 break;
               }
             default:
-              if (vb(this, g, l, n, a, c), f && 1 < d && k < d - 1) {
+              if (yb(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) : 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);
+                    var u = this.score ? this.score(b, n, k, l, r) : xb(p + (d / 2 > p ? 0 : 1), d, k, q - 1, r - 1), w = this.bidirectional && l > n;
+                    yb(this, e, w ? n : l, u, a, c, w ? l : n);
                   }
                 }
               }
@@ -2297,10 +2333,10 @@ O.prototype.add = function(a, b, c, d) {
       b = "";
     }
   }
-  this.db && (b || this.commit_task.push({del:a}), this.da && wb(this));
+  this.db && (b || this.commit_task.push({del:a}), this.da && zb(this));
   return this;
 };
-function vb(a, b, c, d, e, g, f) {
+function yb(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] = 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)) {
@@ -2318,12 +2354,12 @@ function vb(a, b, c, d, e, g, f) {
     }
   }
 }
-function ub(a, b, c, d, e) {
+function xb(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 ? xb(a) : a;
+    return a = a[0], a = c || a.length > b ? b ? a.slice(c, c + b) : a.slice(c) : a, d ? Ab(a) : a;
   }
   for (var e = [], g = 0, f = void 0, h = void 0; g < a.length; g++) {
     if ((f = a[g]) && (h = f.length)) {
@@ -2338,7 +2374,7 @@ function ub(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 ? xb(f) : f;
+          return h > b && (f = f.slice(0, b)), d ? Ab(f) : f;
         }
         e = [f];
       }
@@ -2352,9 +2388,9 @@ function ub(a, b, c, d, e) {
     return e;
   }
   e = 1 < e.length ? [].concat.apply([], e) : e[0];
-  return d ? xb(e) : e;
+  return d ? Ab(e) : e;
 }
-function xb(a) {
+function Ab(a) {
   for (var b = 0; b < a.length; b++) {
     a[b] = {score:b, id:a[b]};
   }
@@ -2401,19 +2437,19 @@ function xb(a) {
   if (c.length) {
     return Promise.all(c).then(function() {
       a.result.length && (d = d.concat([a.result]));
-      a.result = yb(d, e, g, f, h, a.J);
+      a.result = Bb(d, e, g, f, h, a.J);
       return h ? a.result : a;
     });
   }
-  d.length && (this.result.length && (d = d.concat([this.result])), this.result = yb(d, e, g, f, h, this.J));
+  d.length && (this.result.length && (d = d.concat([this.result])), this.result = Bb(d, e, g, f, h, this.J));
   return h ? this.result : this;
 };
-function yb(a, b, c, d, e, g) {
+function Bb(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] : bb(a, c, b, e, g);
+  return 2 > a.length ? e ? X(a[0], b, c, d) : a[0] : eb(a, c, b, e, g);
 }
 ;Y.prototype.and = function() {
   if (this.result.length) {
@@ -2460,24 +2496,24 @@ function yb(a, b, c, d, e, g) {
     if (c.length) {
       return Promise.all(c).then(function() {
         d = [a.result].concat(d);
-        a.result = zb(d, e, g, f, a.J, h);
+        a.result = Cb(d, e, g, f, a.J, h);
         return f ? a.result : a;
       });
     }
     d = [this.result].concat(d);
-    this.result = zb(d, e, g, f, this.J, h);
+    this.result = Cb(d, e, g, f, this.J, h);
     return f ? this.result : this;
   }
   return this;
 };
-function zb(a, b, c, d, e, g) {
+function Cb(a, b, c, d, e, g) {
   if (2 > a.length) {
     return [];
   }
   var f = [];
   J();
   var h = Aa(a);
-  return h ? ab(a, h, b, c, g, e, d) : f;
+  return h ? db(a, h, b, c, g, e, d) : f;
 }
 ;Y.prototype.xor = function() {
   var a = this, b = arguments, c = b[0];
@@ -2520,14 +2556,14 @@ function zb(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 = Ab(d, e, g, f, !h, a.J);
+      a.result = Db(d, e, g, f, !h, a.J);
       return h ? a.result : a;
     });
   }
-  d.length && (this.result.length && (d = [this.result].concat(d)), this.result = Ab(d, e, g, f, !h, a.J));
+  d.length && (this.result.length && (d = [this.result].concat(d)), this.result = Db(d, e, g, f, !h, a.J));
   return h ? this.result : this;
 };
-function Ab(a, b, c, d, e, g) {
+function Db(a, b, c, d, e, g) {
   if (!a.length) {
     return a;
   }
@@ -2616,14 +2652,14 @@ function Ab(a, b, c, d, e, g) {
   }
   if (c.length) {
     return Promise.all(c).then(function() {
-      a.result = Bb.call(a, d, e, g, f);
+      a.result = Eb.call(a, d, e, g, f);
       return f ? a.result : a;
     });
   }
-  d.length && (this.result = Bb.call(this, d, e, g, f));
+  d.length && (this.result = Eb.call(this, d, e, g, f));
   return f ? this.result : this;
 };
-function Bb(a, b, c, d) {
+function Eb(a, b, c, d) {
   if (!a.length) {
     return this.result;
   }
@@ -2653,7 +2689,7 @@ function Bb(a, b, c, d) {
   return e;
 }
 ;function Y(a) {
-  if (this.constructor !== Y) {
+  if (!this || this.constructor !== Y) {
     return new Y(a);
   }
   if (a && a.index) {
@@ -2694,12 +2730,12 @@ Y.prototype.boost = function(a) {
   return this;
 };
 Y.prototype.resolve = function(a, b, c) {
-  Cb = 1;
+  Fb = 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 Cb = 1;
+var Fb = 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;
@@ -2709,22 +2745,22 @@ O.prototype.search = function(a, b, c) {
     e = c.offset || 0;
     var f = c.context;
     var h = c.suggest;
-    (g = Cb && !1 !== c.resolve) || (Cb = 0);
+    (g = Fb && !1 !== c.resolve) || (Fb = 0);
     var k = g && c.enrich;
     var l = c.boost;
     var m = this.db && c.tag;
   } else {
-    g = this.resolve || Cb;
+    g = this.resolve || Fb;
   }
   a = this.encoder.encode(a);
   var n = a.length;
   b || !g || (b = 100);
   if (1 === n) {
-    return Db.call(this, a[0], "", b, e, g, k, m);
+    return Gb.call(this, a[0], "", b, e, g, k, m);
   }
   f = this.depth && !1 !== f;
   if (2 === n && f && !h) {
-    return Db.call(this, a[0], a[1], b, e, g, k, m);
+    return Gb.call(this, a[0], a[1], b, e, g, k, m);
   }
   var p = c = 0;
   if (1 < n) {
@@ -2748,10 +2784,10 @@ O.prototype.search = function(a, b, c) {
   }
   var x = 0;
   if (1 === n) {
-    return Db.call(this, a[0], "", b, e, g, k, m);
+    return Gb.call(this, a[0], "", b, e, g, k, m);
   }
   if (2 === n && f && !h) {
-    return Db.call(this, a[0], a[1], b, e, g, k, m);
+    return Gb.call(this, a[0], a[1], b, e, g, k, m);
   }
   if (1 < n) {
     if (f) {
@@ -2781,11 +2817,11 @@ O.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 = Eb(A, d, h, z.resolution);
+            A = Hb(A, d, h, z.resolution);
             F.h = 6;
             break;
           case 8:
-            A = F.F, A = Eb(A, d, h, z.aa), h && !1 === A && d.length || (t = B);
+            A = F.F, A = Hb(A, d, h, z.aa), h && !1 === A && d.length || (t = B);
           case 6:
             if (A) {
               return F.return(A);
@@ -2810,14 +2846,14 @@ O.prototype.search = function(a, b, c) {
             F.h = 2;
             break;
           case 4:
-            return F.return(g ? ab(d, z.resolution, b, e, h, l, g) : new Y(d[0]));
+            return F.return(g ? db(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 = 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));
+    t ? (f = Z(this, k, t, 0, 0, !1, !1), f = Hb(f, d, h, this.aa), h && !1 === f && d.length || (t = k)) : (f = Z(this, k, "", 0, 0, !1, !1), f = Hb(f, d, h, this.resolution));
     if (f) {
       return f;
     }
@@ -2836,16 +2872,16 @@ O.prototype.search = function(a, b, c) {
       }
     }
   }
-  d = ab(d, this.resolution, b, e, h, l, g);
+  d = db(d, this.resolution, b, e, h, l, g);
   return g ? d : new Y(d);
 };
-function Db(a, b, c, d, e, g, f) {
+function Gb(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 Eb(a, b, c, d) {
+function Hb(a, b, c, d) {
   var e = [];
   if (a) {
     d = Math.min(a.length, d);
@@ -2883,15 +2919,15 @@ function Z(a, b, c, d, e, g, f, h) {
         }
       }
     } else {
-      Fb(this.map, a), this.depth && Fb(this.ctx, a);
+      Ib(this.map, a), this.depth && Ib(this.ctx, a);
     }
     b || this.reg.delete(a);
   }
-  this.db && (this.commit_task.push({del:a}), this.da && wb(this));
+  this.db && (this.commit_task.push({del:a}), this.da && zb(this));
   this.cache && this.cache.remove(a);
   return this;
 };
-function Fb(a, b) {
+function Ib(a, b) {
   var c = 0;
   if (a.constructor === Array) {
     for (var d = 0, e = void 0, g; d < a.length; d++) {
@@ -2906,23 +2942,23 @@ function Fb(a, b) {
     }
   } else {
     for (d = y(a), e = d.next(); !e.done; e = d.next()) {
-      g = e.value, e = g[0], (g = Fb(g[1], b)) ? c += g : a.delete(e);
+      g = e.value, e = g[0], (g = Ib(g[1], b)) ? c += g : a.delete(e);
     }
   }
   return c;
 }
 ;function O(a, b) {
-  if (this.constructor !== O) {
+  if (!this || this.constructor !== O) {
     return new O(a);
   }
   if (a) {
     var c = K(a) ? a : a.preset;
-    c && (tb[c] || console.warn("Preset not found: " + c), a = Object.assign({}, tb[c], a));
+    c && (wb[c] || console.warn("Preset not found: " + c), a = Object.assign({}, wb[c], a));
   } else {
     a = {};
   }
   c = a.context || {};
-  var d = K(a.encoder) ? sb[a.encoder] : a.encode || a.encoder || kb;
+  var d = K(a.encoder) ? vb[a.encoder] : a.encode || a.encoder || nb;
   this.encoder = d.encode ? d : "object" === typeof d ? new N(d) : {encode:d};
   var e;
   this.resolution = a.resolution || 9;
@@ -2959,7 +2995,7 @@ v.destroy = function() {
   this.commit_timer && (clearTimeout(this.commit_timer), this.commit_timer = null);
   return this.db.destroy();
 };
-function wb(a) {
+function zb(a) {
   a.commit_timer || (a.commit_timer = setTimeout(function() {
     a.commit_timer = null;
     a.db.commit(a, void 0, void 0);
@@ -2985,7 +3021,7 @@ v.update = function(a, b) {
     return c.add(a, b);
   }) : this.add(a, b);
 };
-function Gb(a) {
+function Jb(a) {
   var b = 0;
   if (a.constructor === Array) {
     for (var c = 0, d = void 0; c < a.length; c++) {
@@ -2995,7 +3031,7 @@ function Gb(a) {
     for (c = y(a), d = c.next(); !d.done; d = c.next()) {
       var e = d.value;
       d = e[0];
-      (e = Gb(e[1])) ? b += e : a.delete(d);
+      (e = Jb(e[1])) ? b += e : a.delete(d);
     }
   }
   return b;
@@ -3004,17 +3040,17 @@ v.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
-  Gb(this.map);
-  this.depth && Gb(this.ctx);
+  Jb(this.map);
+  this.depth && Jb(this.ctx);
   return this;
 };
-v.searchCache = jb;
+v.searchCache = mb;
 v.export = function(a, b, c, d) {
   d = void 0 === d ? 0 : d;
   switch(d) {
     case 0:
       var e = "reg";
-      var g = Ra(this.reg);
+      var g = Ta(this.reg);
       break;
     case 1:
       e = "cfg";
@@ -3022,29 +3058,29 @@ v.export = function(a, b, c, d) {
       break;
     case 2:
       e = "map";
-      g = Pa(this.map);
+      g = Pa(this.map, this.reg.size);
       break;
     case 3:
       e = "ctx";
-      g = Qa(this.ctx);
+      g = Ra(this.ctx, this.reg.size);
       break;
     default:
       return;
   }
-  return Sa.call(this, a, b, e, c, d, g);
+  return Va.call(this, a, b, e, g, c, d);
 };
 v.import = function(a, b) {
   if (b) {
-    switch(K(b) && (b = JSON.parse(b)), a) {
+    switch(K(b) && (b = JSON.parse(b)), a = a.split("."), "json" === a[a.length - 1] && a.pop(), a = 1 < a.length ? a[1] : a[0], a) {
       case "reg":
         this.fastupdate = !1;
-        this.reg = new Set(b);
+        this.reg = Ua(b, this.reg);
         break;
       case "map":
-        this.map = new Map(b);
+        this.map = Qa(b, this.map);
         break;
       case "ctx":
-        this.ctx = new Map(b);
+        this.ctx = Sa(b, this.ctx);
     }
   }
 };
@@ -3101,11 +3137,11 @@ v.serialize = function(a) {
   return a ? "function inject(index){" + b + d + e + "}" : b + d + e;
 };
 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) {
+var Kb = "undefined" !== typeof window && (window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB), Lb = ["map", "ctx", "tag", "reg", "cfg"];
+function Mb(a, b) {
   b = void 0 === b ? {} : b;
   if (!this) {
-    return new Jb(a, b);
+    return new Mb(a, b);
   }
   "object" === typeof a && (b = a = a.name);
   a || console.info("Default storage space was used, because a name was not passed.");
@@ -3115,7 +3151,7 @@ function Jb(a, b) {
   this.db = null;
   this.h = {};
 }
-v = Jb.prototype;
+v = Mb.prototype;
 v.mount = function(a) {
   if (!a.encoder) {
     return a.mount(this);
@@ -3127,10 +3163,10 @@ v.open = function() {
   var a = this;
   navigator.storage && navigator.storage.persist();
   return this.db || new Promise(function(b, c) {
-    var d = Hb.open(a.id + (a.field ? ":" + a.field : ""), 1);
+    var d = Kb.open(a.id + (a.field ? ":" + a.field : ""), 1);
     d.onupgradeneeded = function() {
       var e = a.db = this.result;
-      Ib.forEach(function(g) {
+      Lb.forEach(function(g) {
         e.objectStoreNames.contains(g) || e.createObjectStore(g);
       });
     };
@@ -3156,13 +3192,13 @@ v.close = function() {
   this.db = null;
 };
 v.destroy = function() {
-  return Hb.deleteDatabase(this.id + (this.field ? ":" + this.field : ""));
+  return Kb.deleteDatabase(this.id + (this.field ? ":" + this.field : ""));
 };
 v.clear = function() {
-  for (var a = this.db.transaction(Ib, "readwrite"), b = 0; b < Ib.length; b++) {
-    a.objectStore(Ib[b]).clear();
+  for (var a = this.db.transaction(Lb, "readwrite"), b = 0; b < Lb.length; b++) {
+    a.objectStore(Lb[b]).clear();
   }
-  return Kb(a);
+  return Nb(a);
 };
 v.get = function(a, b, c, d, e, g) {
   c = void 0 === c ? 0 : c;
@@ -3171,7 +3207,7 @@ 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 Kb(a).then(function(h) {
+  return Nb(a).then(function(h) {
     var k = [];
     if (!h || !h.length) {
       return k;
@@ -3206,7 +3242,7 @@ 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 Kb(a).then(function(g) {
+  return Nb(a).then(function(g) {
     if (!g || !g.length || c >= g.length) {
       return [];
     }
@@ -3220,7 +3256,7 @@ 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] = Kb(b.get(a[d]));
+    c[d] = Nb(b.get(a[d]));
   }
   return Promise.all(c).then(function(e) {
     for (var g = 0; g < e.length; g++) {
@@ -3231,7 +3267,7 @@ v.enrich = function(a) {
 };
 v.has = function(a) {
   a = this.db.transaction("reg", "readonly").objectStore("reg").getKey(a);
-  return Kb(a);
+  return Nb(a);
 };
 v.search = null;
 v.info = function() {
@@ -3406,7 +3442,7 @@ v.commit = function(a, b, c) {
     }
   });
 };
-function Nb(a, b, c) {
+function Qb(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++) {
@@ -3433,17 +3469,17 @@ v.remove = function(a) {
   return Promise.all([this.transaction("map", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       var c = this.result;
-      c && Nb(c, a);
+      c && Qb(c, a);
     };
   }), this.transaction("ctx", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       var c = this.result;
-      c && Nb(c, a);
+      c && Qb(c, a);
     };
   }), this.transaction("tag", "readwrite", function(b) {
     b.openCursor().onsuccess = function() {
       var c = this.result;
-      c && Nb(c, a, !0);
+      c && Qb(c, a, !0);
     };
   }), this.transaction("reg", "readwrite", function(b) {
     for (var c = 0; c < a.length; c++) {
@@ -3451,7 +3487,7 @@ v.remove = function(a) {
     }
   })]);
 };
-function Kb(a) {
+function Nb(a) {
   return new Promise(function(b, c) {
     a.onsuccess = function() {
       b(this.result);
@@ -3463,8 +3499,8 @@ function Kb(a) {
     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;
+;var Rb = {Index:O, Charset:vb, Encoder:N, Document:V, Worker:R, Resolver:Y, IndexedDB:Mb, Language:{}}, Sb = self, Tb;
+(Tb = Sb.define) && Tb.amd ? Tb([], function() {
+  return Rb;
+}) : "object" === typeof Sb.exports ? Sb.exports = Rb : Sb.FlexSearch = Rb;
 }(this||self));
diff --git a/dist/flexsearch.es5.min.js b/dist/flexsearch.es5.min.js
index 9fdfbb8..a9e5571 100644
--- a/dist/flexsearch.es5.min.js
+++ b/dist/flexsearch.es5.min.js
@@ -41,93 +41,96 @@ function J(){return Object.create(null)}function xa(a,b){return b.length-a.lengt
 "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"]];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 h=arguments;else{h=x(arguments);for(var f,g=[];!(f=h.next()).done;)g.push(f.value);h=g}return new (c.call(b,N,e.call(d,h)))}for(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"]];var Ca=/[^\p{L}\p{N}]+/u,Da=/(\d{3})/g,Ea=/(\D)(\d{3})/g,Fa=/(\d{3})(\D)/g,Ha="".normalize&&/[\u0300-\u036f]/g;function N(a){if(!this||this.constructor!==N){var b=Function.prototype.bind,c=b.apply,d=[null],e=d.concat;if(arguments instanceof Array)var h=arguments;else{h=x(arguments);for(var f,g=[];!(f=h.next()).done;)g.push(f.value);h=g}return new (c.call(b,N,e.call(d,h)))}for(b=0;b<arguments.length;b++)this.assign(arguments[b])}
 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="";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(h){this.split=/\s+/}this.numeric=d}else{try{this.split=I(c,Ca,this.split)}catch(h){this.split=
 /\s+/}this.numeric=I(this.numeric,!0)}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=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="";this.F=null;this.C="";this.G=null;if(this.matcher)for(a=x(this.matcher.keys()),b=a.next();!b.done;b=a.next())this.B+=(this.B?"|":"")+b.value;if(this.stemmer)for(a=x(this.stemmer.keys()),b=a.next();!b.done;b=a.next())this.C+=(this.C?"|":"")+b.value;return this};
-N.prototype.encode=function(a){var b=this;if(this.cache&&a.length<=this.h)if(this.U){if(this.N.has(a))return this.N.get(a)}else this.U=setTimeout(Ia,50,this);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(Fa,"$1 $2").replace(Ga,"$1 $2").replace(Da,"$1 "));for(var c=!(this.dedupe||this.mapper||this.filter||this.matcher||this.stemmer||
+N.prototype.encode=function(a){var b=this;if(this.cache&&a.length<=this.h)if(this.U){if(this.N.has(a))return this.N.get(a)}else this.U=setTimeout(Ia,50,this);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(Ea,"$1 $2").replace(Fa,"$1 $2").replace(Da,"$1 "));for(var c=!(this.dedupe||this.mapper||this.filter||this.matcher||this.stemmer||
 this.replacer),d=[],e=this.split||""===this.split?a.split(this.split):a,h=0,f=void 0,g=void 0;h<e.length;h++)if((f=g=e[h])&&!(f.length<this.minlength))if(c)d.push(f);else if(!this.filter||!this.filter.has(f)){if(this.cache&&f.length<=this.A)if(this.U){var k=this.S.get(f);if(k||""===k){k&&d.push(k);continue}}else this.U=setTimeout(Ia,50,this);k=void 0;this.stemmer&&2<f.length&&(this.G||(this.G=new RegExp("(?!^)("+this.C+")$")),f=f.replace(this.G,function(q){return b.stemmer.get(q)}),k=1);f&&k&&(f.length<
 this.minlength||this.filter&&this.filter.has(f))&&(f="");if(f&&(this.mapper||this.dedupe&&1<f.length)){k="";for(var l=0,m="",n=void 0,p=void 0;l<f.length;l++)n=f.charAt(l),n===m&&this.dedupe||((p=this.mapper&&this.mapper.get(n))||""===p?p===m&&this.dedupe||!(m=p)||(k+=p):k+=m=n);f=k}this.matcher&&1<f.length&&(this.F||(this.F=new RegExp("("+this.B+")","g")),f=f.replace(this.F,function(q){return b.matcher.get(q)}));if(f&&this.replacer)for(k=0;f&&k<this.replacer.length;k+=2)f=f.replace(this.replacer[k],
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 u.clear=function(){for(var a=x(this.index.values()),b=a.next();!b.done;b=a.next())b.value.clear();if(this.tag)for(a=x(this.tag.values()),b=a.next();!b.done;b=a.next())b.value.clear();this.store&&this.store.clear();return this};u.contain=function(a){return this.db?this.index.get(this.field[0]).db.has(a):this.reg.has(a)};u.cleanup=function(){for(var a=x(this.index.values()),b=a.next();!b.done;b=a.next())b.value.cleanup();return this};
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+function Pb(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 Rb={Index:O,Charset:vb,Encoder:N,Document:V,Worker:R,Resolver:Y,IndexedDB:Mb,Language:{}},Sb=self,Tb;(Tb=Sb.define)&&Tb.amd?Tb([],function(){return Rb}):"object"===typeof Sb.exports?Sb.exports=Rb:Sb.FlexSearch=Rb;}(this||self));
diff --git a/dist/flexsearch.light.debug.js b/dist/flexsearch.light.debug.js
index b5de2a1..11fa5b2 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.constructor !== C) {
+  if (!this || 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.constructor !== H) {
+  if (!this || this.constructor !== H) {
     return new H(a);
   }
   if (a) {
diff --git a/dist/flexsearch.light.min.js b/dist/flexsearch.light.min.js
index c73e958..4d21403 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
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+(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||this.constructor!==C)return new C(...arguments);for(let c=0;c<arguments.length;c++)this.assign(arguments[c])}
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@@ -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
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-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 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||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)};
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 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 b56ad9f..22e033b 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.constructor !== C) {
+  if (!this || 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.constructor !== H) {
+  if (!this || 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 a3d94c0..461cc62 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.constructor!==C)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||this.constructor!==C)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};
@@ -19,8 +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
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 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.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 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||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/lang/de.min.js b/dist/lang/de.min.js
index 480cc66..f19ef2c 100644
--- a/dist/lang/de.min.js
+++ b/dist/lang/de.min.js
@@ -1,2 +1,72 @@
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+L.prototype.search=function(a,b,c){c||(!b&&H(a)?(c=a,a=""):H(b)&&(c=b,b=0));let d=[],e;let f,g=0,h,k,l,m;if(c){a=c.query||a;b=c.J||b;g=c.offset||0;var r=c.context;f=c.ka;(h=ab&&!1!==c.resolve)||(ab=0);k=h&&c.I;m=c.ma;l=this.db&&c.tag}else h=this.resolve||ab;a=this.U.encode(a);e=a.length;b||!h||(b=100);if(1===e)return bb.call(this,a[0],"",b,g,h,k,l);r=this.depth&&!1!==r;if(2===e&&r&&!f)return bb.call(this,a[0],a[1],b,g,h,k,l);let n=c=0;if(1<e){const q=B(),u=[];for(let w=0,D;w<e;w++)if((D=a[w])&&!q[D]){if(f||
+this.db||Z(this,D))u.push(D),q[D]=1;else return h?d:new Y(d);const x=D.length;c=Math.max(c,x);n=n?Math.min(n,x):x}a=u;e=a.length}if(!e)return h?d:new Y(d);let p=0,t;if(1===e)return bb.call(this,a[0],"",b,g,h,k,l);if(2===e&&r&&!f)return bb.call(this,a[0],a[1],b,g,h,k,l);1<e&&(r?(t=a[0],p=1):9<c&&3<c/n&&a.sort(aa));if(this.db){if(this.db.search&&(r=this.db.search(this,a,b,g,f,h,k,l),!1!==r))return r;const q=this;return async function(){for(let u,w;p<e;p++){w=a[p];t?(u=await Z(q,w,t,0,0,!1,!1),u=cb(u,
+d,f,q.ja),f&&!1===u&&d.length||(t=w)):(u=await Z(q,w,"",0,0,!1,!1),u=cb(u,d,f,q.G));if(u)return u;if(f&&p===e-1){let D=d.length;if(!D){if(t){t="";p=-1;continue}return d}if(1===D)return h?X(d[0],b,g):new Y(d[0])}}return h?wa(d,q.G,b,g,f,m,h):new Y(d[0])}()}for(let q,u;p<e;p++){u=a[p];t?(q=Z(this,u,t,0,0,!1,!1),q=cb(q,d,f,this.ja),f&&!1===q&&d.length||(t=u)):(q=Z(this,u,"",0,0,!1,!1),q=cb(q,d,f,this.G));if(q)return q;if(f&&p===e-1){r=d.length;if(!r){if(t){t="";p=-1;continue}return d}if(1===r)return h?
+X(d[0],b,g):new Y(d[0])}}d=wa(d,this.G,b,g,f,m,h);return h?d:new Y(d)};function bb(a,b,c,d,e,f,g){a=Z(this,a,b,c,d,e,f,g);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 cb(a,b,c,d){let e=[];if(a){d=Math.min(a.length,d);for(let f=0,g;f<d;f++)(g=a[f])&&g&&(e[f]=g);if(e.length){b.push(e);return}}return!c&&e}
+function Z(a,b,c,d,e,f,g,h){let k;c&&(k=a.fa&&b>c);a.aa&&(b=Ra(b),c&&(c=Ra(c)));if(a.db)return c?a.db.get(k?c:b,k?b:c,d,e,f,g,h):a.db.get(b,"",d,e,f,g,h);a=c?(a=a.S.get(k?b:c))&&a.get(k?c:b):a.map.get(b);return a};L.prototype.remove=function(a,b){const c=this.B.size&&(this.C?this.B.get(a):this.B.has(a));if(c){if(this.C)for(let d=0,e;d<c.length;d++){if(e=c[d])if(2>e.length)e.pop();else{const f=e.indexOf(a);f===c.length-1?e.pop():e.splice(f,1)}}else db(this.map,a),this.depth&&db(this.S,a);b||this.B.delete(a)}this.db&&(this.ga.push({del:a}),this.na&&Ua(this));this.cache&&this.cache.remove(a);return this};
+function db(a,b){let c=0;if(a.constructor===Array)for(let d=0,e,f;d<a.length;d++){if((e=a[d])&&e.length)if(f=e.indexOf(b),0<=f){1<e.length?(e.splice(f,1),c++):delete a[d];break}else c++}else for(let d of a){const e=d[0],f=db(d[1],b);f?c+=f:a.delete(e)}return c};function L(a,b){if(!this||this.constructor!==L)return new L(a);var c=Pa.profiler||(Pa.profiler={});c["Index.create"]||(c["Index.create"]=0);c["Index.create"]++;if(a){if(c=G(a)?a:a.preset)Oa[c]||console.warn("Preset not found: "+c),a=Object.assign({},Oa[c],a)}else a={};c=a.context||{};const d=G(a.U)?Na[a.U]:a.encode||a.U||Fa;this.U=d.encode?d:"object"===typeof d?new K(d):{encode:d};this.aa=a.aa||a.Ba||!1;let e;this.G=a.G||9;this.ca=e=a.ca||"strict";this.depth="strict"===e&&c.depth||0;this.fa=!1!==
+c.fa;this.C=!!a.C;this.L=a.L||null;(e=a.ia||0)&&(this.ia=e);this.map=e?new Q(e):new Map;this.S=e?new Q(e):new Map;this.B=b||(this.C?e?new Q(e):new Map:e?new R(e):new Set);this.ja=c.G||1;this.rtl=d.rtl||a.rtl||!1;this.cache=(e=a.cache||null)&&new T(e);this.resolve=!1!==a.resolve;if(e=a.db)this.db=this.Y(e);this.na=!1!==a.commit;this.ga=[];this.h=null}y=L.prototype;y.Y=function(a){this.h&&(clearTimeout(this.h),this.h=null);return a.Y(this)};
+y.commit=function(a,b){this.h&&(clearTimeout(this.h),this.h=null);return this.db.commit(this,a,b)};function Ua(a){a.h||(a.h=setTimeout(function(){a.h=null;a.db.commit(a,void 0,void 0)},0))}y.clear=function(){this.map.clear();this.S.clear();this.B.clear();this.cache&&this.cache.clear();this.db&&(this.h&&clearTimeout(this.h),this.h=null,this.ga=[{clear:!0}]);return this};y.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)};
+y.import=function(a,b){if(b)switch(G(b)&&(b=JSON.parse(b)),a=a.split("."),"json"===a[a.length-1]&&a.pop(),a=1<a.length?a[1]:a[0],a){case "reg":this.C=!1;this.B=qa(b,this.B);break;case "map":this.map=oa(b,this.map);break;case "ctx":this.S=pa(b,this.S)}};na(L.prototype);const eb={prepare:function(a){return a.replace(/\u00b4`\u2019\u02bc/g,"'").replace(/_+/g," ").replace(/&/g," et ").replace(/\u20ac/g," EUR ").replace(/\bl'([^\b])/g,"la le $1").replace(/\bt'([^\b])/g,"ta te $1").replace(/\bc'([^\b])/g,"ca ce $1").replace(/\bd'([^\b])/g,"da de $1").replace(/\bj'([^\b])/g,"ja je $1").replace(/\bn'([^\b])/g,"na ne $1").replace(/\bm'([^\b])/g,"ma me $1").replace(/\bs'([^\b])/g,"sa se $1").replace(/\bau\b/g,"a le").replace(/\baux\b/g,"a les").replace(/\bdu\b/g,"de le").replace(/\bdes\b/g,
 "de les")},filter:new Set("au aux avec ce ces dans de des du elle en et eux il je la le leur lui ma mais me meme mes moi mon ne nos notre nous on ou par pas pour qu que qui sa se ses son sur ta te tes toi ton tu un une vos votre vous c d j l m n s t a y ete etee etees etes etant suis es est sommes etes sont serai seras sera serons serez seront serais serait serions seriez seraient etais etait etions etiez etaient fus fut fumes futes furent sois soit soyons soyez soient fusse fusses fut fussions fussiez fussent ayant eu eue eues eus ai as avons avez ont aurai auras aura aurons aurez auront aurais aurait aurions auriez auraient avais avait avions aviez avaient eut eumes eutes eurent aie aies ait ayons ayez aient eusse eusses eut eussions eussiez eussent ceci cela cela cet cette ici ils les leurs quel quels quelle quelles sans soi".split(" ")),
-stemmer:new Map([["lement",""],["ient",""],["nera",""],["ment",""],["ais",""],["ait",""],["ant",""],["ent",""],["iez",""],["ion",""],["nez",""],["ai",""],["es",""],["er",""],["ez",""],["le",""],["na",""],["ne",""],["a",""],["e",""]])};"undefined"!==typeof module&&module.exports?module.exports=a:self.FlexSearch&&(self.FlexSearch.Language.fr=a);}(this||self));
+stemmer:new Map([["lement",""],["ient",""],["nera",""],["ment",""],["ais",""],["ait",""],["ant",""],["ent",""],["iez",""],["ion",""],["nez",""],["ai",""],["es",""],["er",""],["ez",""],["le",""],["na",""],["ne",""],["a",""],["e",""]])};"undefined"!==typeof module&&module.exports?module.exports=eb:self.FlexSearch&&(self.FlexSearch.Language.fr=eb);}(this||self));
diff --git a/dist/module-debug/document.js b/dist/module-debug/document.js
index 2b188fb..8141d6f 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.constructor !== Document) {
+    if (!this || this.constructor !== Document) {
         return new Document(options);
     }
 
@@ -40,8 +40,7 @@ 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 && [];
@@ -50,7 +49,8 @@ export default function Document(options) {
     this.cache = (tmp = options.cache || null) && new Cache(tmp);
     // do not apply cache again for the indexes since .searchCache()
     // is just a wrapper over .search()
-    options.cache = /* suggest */ /* append: */ /* enrich */!1;
+    options.cache =
+    /* suggest */ /* append: */ /* enrich */!1;
 
     this.worker = options.worker;
 
@@ -193,7 +193,7 @@ 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();
 };
 
diff --git a/dist/module-debug/encoder.js b/dist/module-debug/encoder.js
index 34818c3..9a2f956 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.constructor !== Encoder) {
+    if (!this || this.constructor !== Encoder) {
         return new Encoder(...arguments);
     }
 
diff --git a/dist/module-debug/index.js b/dist/module-debug/index.js
index ce377d3..38bb78f 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.constructor !== Index) {
+    if (!this || this.constructor !== Index) {
         return new Index(options);
     }
 
diff --git a/dist/module-debug/resolver.js b/dist/module-debug/resolver.js
index 516f731..63b7eec 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.constructor !== Resolver) {
+    if (!this || 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 4883773..e2b82f6 100644
--- a/dist/module-debug/serialize.js
+++ b/dist/module-debug/serialize.js
@@ -1,81 +1,154 @@
 import Index from "./index.js";
 import Document from "./document.js";
-import { create_object, is_string } from "./common.js";
+import { is_string } from "./common.js";
 
-function map_to_json(map) {
-    const json = [];
+const chunk_size_reg = 250000,
+      chunk_size_map = 5000,
+      chunk_size_ctx = 1000;
+
+
+function map_to_json(map, size = 0) {
+    let chunk = [],
+        json = [];
+
+    if (size) {
+        size = 0 | chunk_size_map * (chunk_size_reg / size);
+    }
     for (const item of map.entries()) {
         json.push(item);
+        if (json.length === size) {
+            chunk.push(json);
+            json = [];
+        }
     }
-    return json;
+    json.length && chunk.push(json);
+    return chunk;
 }
 
-function ctx_to_json(ctx) {
-    const json = [];
-    for (const item of ctx.entries()) {
-        json.push(map_to_json(item));
+function json_to_map(json, map) {
+    map || (map = new Map());
+    for (let i = 0, entry; i < json.length; i++) {
+        entry = json[i];
+        map.set(entry[0], entry[1]);
     }
-    return json;
+    return map;
+}
+
+function ctx_to_json(ctx, size = 0) {
+    let chunk = [],
+        json = [];
+
+    if (size) {
+        size = 0 | chunk_size_ctx * (chunk_size_reg / size);
+    }
+    for (const item of ctx.entries()) {
+        const key = item[0],
+              value = item[1];
+
+        json.push([key, map_to_json(value)[0]]);
+        if (json.length === size) {
+            chunk.push(json);
+            json = [];
+        }
+    }
+    json.length && chunk.push(json);
+    return chunk;
+}
+
+function json_to_ctx(json, ctx) {
+    ctx || (ctx = new Map());
+    for (let i = 0, entry, map; i < json.length; i++) {
+        entry = json[i];
+        map = ctx.get(entry[0]);
+        ctx.set(entry[0], json_to_map(entry[1], map));
+    }
+    return ctx;
 }
 
 function reg_to_json(reg) {
-    const json = [];
+    let chunk = [],
+        json = [];
+
     for (const key of reg.keys()) {
         json.push(key);
+        if (json.length === chunk_size_reg) {
+            chunk.push(json);
+            json = [];
+        }
     }
-    return json;
+    json.length && chunk.push(json);
+    return chunk;
 }
 
-function save(callback, field, key, index_doc, index, data) {
+function json_to_reg(json, reg) {
+    reg || (reg = new Set());
+    for (let i = 0; i < json.length; i++) {
+        reg.add(json[i]);
+    }
+    return reg;
+}
 
-    const res = callback(field ? field + "." + key : key, JSON.stringify(data));
+/**
+ * @this {Index|Document}
+ */
+
+function save(callback, field, key, chunk, index_doc, index_obj, index_prt = 0) {
+    const is_arr = chunk && chunk.constructor === Array,
+          data = is_arr ? chunk.shift() : chunk;
+
+    if (!data) {
+        return this.export(callback, field, index_doc, index_obj + 1);
+    }
+
+    const res = callback((field ? field + "." : "") + (index_prt + 1) + "." + key, JSON.stringify(data));
 
     if (res && res.then) {
         const self = this;
         return res.then(function () {
-            return self.export(callback, field, index_doc, index + 1);
+            return save.call(self, callback, field, key, is_arr ? chunk : null, index_doc, index_obj, index_prt + 1);
         });
     }
 
-    return this.export(callback, field, index_doc, index + 1);
+    return save.call(this, callback, field, key, is_arr ? chunk : null, index_doc, index_obj, index_prt + 1);
 }
 
 /**
  * @param callback
  * @param field
  * @param index_doc
- * @param index
- * @this {Index|Document}
+ * @param index_obj
+ * @this {Index}
  */
 
-export function exportIndex(callback, field, index_doc, index = 0) {
+export function exportIndex(callback, field, index_doc, index_obj = 0) {
 
-    let key, data;
+    let key, chunk;
 
-    switch (index) {
+    switch (index_obj) {
 
         case 0:
 
             key = "reg";
-            data = reg_to_json(this.reg);
+            chunk = reg_to_json(this.reg);
             break;
 
         case 1:
 
+            // todo
             key = "cfg";
-            data = {};
+            chunk = {};
             break;
 
         case 2:
 
             key = "map";
-            data = map_to_json(this.map);
+            chunk = map_to_json(this.map, this.reg.size);
             break;
 
         case 3:
 
             key = "ctx";
-            data = ctx_to_json(this.ctx);
+            chunk = ctx_to_json(this.ctx, this.reg.size);
             break;
 
         default:
@@ -83,11 +156,11 @@ export function exportIndex(callback, field, index_doc, index = 0) {
             return;
     }
 
-    return save.call(this, callback, field, key, index_doc, index, data);
+    return save.call(this, callback, field, key, chunk, index_doc, index_obj);
 }
 
 /**
- * @this Index
+ * @this {Index}
  */
 
 export function importIndex(key, data) {
@@ -99,81 +172,88 @@ export function importIndex(key, data) {
         data = JSON.parse(data);
     }
 
+    key = key.split(".");
+    if ("json" === key[key.length - 1]) {
+        key.pop();
+    }
+    key = 1 < key.length ? key[1] : key[0];
+
     switch (key) {
 
         case "cfg":
+            // todo
             break;
 
         case "reg":
 
             // fast update isn't supported by export/import
             this.fastupdate = /* suggest */ /* append: */ /* enrich */!1;
-            this.reg = new Set(data);
+            this.reg = json_to_reg(data, this.reg);
             break;
 
         case "map":
 
-            this.map = new Map(data);
+            this.map = json_to_map(data, this.map);
             break;
 
         case "ctx":
 
-            this.ctx = new Map(data);
+            this.ctx = json_to_ctx(data, this.ctx);
             break;
     }
 }
 
 /**
- * @this Document
+ * @this {Document}
  */
 
-export function exportDocument(callback, field, index_doc = 0, index = 0) {
+export function exportDocument(callback, field, index_doc = 0, index_obj = 0) {
 
     if (index_doc < this.field.length) {
         const field = this.field[index_doc],
               idx = this.index.get(field),
-              res = idx.export(callback, field, index_doc, index = 1);
+              res = idx.export(callback, field, index_doc, index_obj = 1);
         // start from index 1, because document indexes does not additionally store register
 
         if (res && res.then) {
             const self = this;
             return res.then(function () {
-                return self.export(callback, field, index_doc + 1, index = 0);
+                return self.export(callback, field, index_doc + 1);
             });
         }
 
-        return this.export(callback, field, index_doc + 1, index = 0);
+        return this.export(callback, field, index_doc + 1);
     } else {
 
-        let key, data;
+        let key, chunk;
 
-        switch (index) {
+        switch (index_obj) {
 
             case 0:
 
                 key = "reg";
-                data = reg_to_json(this.reg);
+                chunk = reg_to_json(this.reg);
                 field = null;
                 break;
 
             case 1:
 
                 key = "tag";
-                data = ctx_to_json(this.tag);
+                chunk = ctx_to_json(this.tag, this.reg.size);
                 field = null;
                 break;
 
             case 2:
 
                 key = "doc";
-                data = map_to_json(this.store);
+                chunk = map_to_json(this.store);
                 field = null;
                 break;
 
             case 3:
 
                 key = "cfg";
-                data = {};
+                chunk = {};
                 field = null;
                 break;
 
@@ -182,12 +262,12 @@ export function exportDocument(callback, field, index_doc = 0, index = 0) {
                 return;
         }
 
-        return save.call(this, callback, field, key, index_doc, index, data);
+        return save.call(this, callback, field, key, chunk, index_doc, index_obj);
     }
 }
 
 /**
- * @this Document
+ * @this {Document}
  */
 
 export function importDocument(key, data) {
@@ -199,41 +279,49 @@ export function importDocument(key, data) {
         data = JSON.parse(data);
     }
 
-    switch (key) {
+    key = key.split(".");
+    if ("json" === key[key.length - 1]) {
+        key.pop();
+    }
+    const field = 2 < key.length ? key[0] : "";
+    key = 2 < key.length ? key[2] : key[1];
 
-        case "tag":
+    if (!field) {
 
-            this.tagindex = new Map(data);
-            break;
+        switch (key) {
 
-        case "reg":
+            case "reg":
 
-            // fast update isn't supported by export/import
-            this.fastupdate = !1;
-            this.reg = new Set(data);
+                // fast update isn't supported by export/import
+                this.fastupdate = !1;
+                this.reg = json_to_reg(data, this.reg);
 
-            for (let i = 0, idx; i < this.field.length; i++) {
-                idx = this.index.get(this.field[i]);
-                idx.fastupdate = !1;
-                idx.reg = this.reg;
-            }
+                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;
+                break;
 
-        case "doc":
+            case "tag":
 
-            this.store = new Map(data);
-            break;
+                this.tag = json_to_ctx(data, this.tag);
+                break;
 
-        default:
+            case "doc":
 
-            key = key.split(".");
-            const field = key[0];
-            key = key[1];
+                this.store = json_to_map(data, this.store);
+                break;
 
-            if (field && key) {
-                this.index.get(field).import(key, data);
-            }
+            case "cfg":
+
+                break;
+
+        }
+    } else {
+
+        return this.index.get(field).import(key, data);
     }
 }
 
@@ -312,89 +400,4 @@ export function serialize(withFunctionWrapper = /* tag? */ /* stringify */ /* st
     ctx = "index.ctx=new Map([" + ctx + "]);";
 
     return withFunctionWrapper ? "function inject(index){" + reg + map + ctx + "}" : reg + map + ctx;
-}
-
-// export function exportSnapshot(flexsearch){
-//
-//     if(!flexsearch.reg.size) return;
-//
-//     let reg = '';
-//     let type = "";
-//     for(const key of flexsearch.reg.keys()){
-//         type || (type = typeof key);
-//         reg += (reg ? ',' : '') + (type === "string" ? '"' + key + '"' : key);
-//     }
-//     reg = "f.reg=[" + reg + "];";
-//
-//     let map = '';
-//     for(const item of flexsearch.map.entries()){
-//         const key = item[0];
-//         const value = item[1];
-//         let res = '';
-//         for(let i = 0, ids; i < value.length; i++){
-//             ids = value[i] || [''];
-//             let str = '';
-//             for(let j = 0; j < ids.length; j++){
-//                 str += (str ? ',' : '') + (type === "string" ? '"' + ids[j] + '"' : ids[j]);
-//             }
-//             str = "[
-//             res += (res ? '|' : '') + str;
-//         }
-//         map += (map ? ';' : '') + key + ':' + res;
-//     }
-//
-//
-//     let ctx = '';
-//     for(const context of flexsearch.ctx.entries()){
-//         const key_ctx = context[0];
-//         const value_ctx = context[1];
-//
-//         for(const item of value_ctx.entries()){
-//             const key = item[0];
-//             const value = item[1];
-//
-//             let res = '';
-//             for(let i = 0, ids; i < value.length; i++){
-//                 ids = value[i] || [''];
-//                 let str = '';
-//                 for(let j = 0; j < ids.length; j++){
-//                     str += (str ? ',' : '') + (type === "string" ? '"' + ids[j] + '"' : ids[j]);
-//                 }
-//                 res += (res ? '|' : '') + str;
-//             }
-//             ctx += (ctx ? ';' : '') + key_ctx + '+' + key + ':' + res;
-//         }
-//     }
-//
-//     return reg + '#' + map + '#' + ctx;
-// }
-//
-// export function importSnapshot(flexsearch, input){
-//
-//     if(!input) return;
-//
-//     let pos_reg = input.indexOf("#");
-//     const reg = input.substring(0, pos_reg).split(",");
-//     flexsearch.reg = new Set(reg);
-//
-//     let pos_map = input.indexOf("#", pos_reg + 1);
-//     const map = input.substring(pos_reg + 1, pos_map).split(";").map(res => {
-//         const split = res.split(":");
-//         split[1] = split[1].split("|").map(ids => ids ? ids.split(",") : null);
-//         return split;
-//     });
-//     flexsearch.map = new Map(map);
-//
-//     input = input.substring(pos_map + 1);
-//     if(input){
-//         const ctx = input.split(";").map(res => {
-//             const split = res.split(":");
-//             const context = split[0].split("+");
-//             const map = new Map([
-//                 [context[1], split[1].split("|").map(ids => ids ? ids.split(",") : null)]
-//             ]);
-//             return [context[0], map]
-//         });
-//         flexsearch.ctx = new Map(ctx);
-//     }
-// }
\ No newline at end of file
+}
\ No newline at end of file
diff --git a/dist/module-debug/worker.js b/dist/module-debug/worker.js
index 2a23bd3..39ca44d 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.constructor !== WorkerIndex) {
+    if (!this || this.constructor !== WorkerIndex) {
         return new WorkerIndex(options);
     }
 
diff --git a/dist/module-min/document.js b/dist/module-min/document.js
index 227a2f6..f05680d 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.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
+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||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 68dffd0..c17157d 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.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
+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||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 06cc57c..5fe0587 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.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
+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||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 f7ad81f..bca8b00 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.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
+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&&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 2bf1ccd..2e516fb 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 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
+import Index from"./index.js";import Document from"./document.js";import{is_string}from"./common.js";const chunk_size_reg=250000,chunk_size_map=5000,chunk_size_ctx=1000;function map_to_json(a,b=0){let c=[],d=[];b&&(b=0|chunk_size_map*(chunk_size_reg/b));for(const e of a.entries())d.push(e),d.length===b&&(c.push(d),d=[]);return d.length&&c.push(d),c}function json_to_map(a,b){b||(b=new Map);for(let c,d=0;d<a.length;d++)c=a[d],b.set(c[0],c[1]);return b}function ctx_to_json(a,b=0){let c=[],d=[];b&&(b=0|chunk_size_ctx*(chunk_size_reg/b));for(const e of a.entries()){const a=e[0],f=e[1];d.push([a,map_to_json(f)[0]]),d.length===b&&(c.push(d),d=[])}return d.length&&c.push(d),c}function json_to_ctx(a,b){b||(b=new Map);for(let c,d,e=0;e<a.length;e++)c=a[e],d=b.get(c[0]),b.set(c[0],json_to_map(c[1],d));return b}function reg_to_json(a){let b=[],c=[];for(const d of a.keys())c.push(d),c.length===chunk_size_reg&&(b.push(c),c=[]);return c.length&&b.push(c),b}function json_to_reg(a,b){b||(b=new Set);for(let c=0;c<a.length;c++)b.add(a[c]);return b}function save(a,b,c,d,e,f,g=0){const h=d&&d.constructor===Array,i=h?d.shift():d;if(!i)return this.export(a,b,e,f+1);const j=a((b?b+".":"")+(g+1)+"."+c,JSON.stringify(i));if(j&&j.then){const i=this;return j.then(function(){return save.call(i,a,b,c,h?d:null,e,f,g+1)})}return save.call(this,a,b,c,h?d:null,e,f,g+1)}export function exportIndex(a,b,c,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,this.reg.size);break;case 3:e="ctx",f=ctx_to_json(this.ctx,this.reg.size);break;default:return;}return save.call(this,a,b,e,f,c,d)}export function importIndex(a,b){if(b)switch(is_string(b)&&(b=JSON.parse(b)),a=a.split("."),"json"===a[a.length-1]&&a.pop(),a=1<a.length?a[1]:a[0],a){case"cfg":break;case"reg":this.fastupdate=!1,this.reg=json_to_reg(b,this.reg);break;case"map":this.map=json_to_map(b,this.map);break;case"ctx":this.ctx=json_to_ctx(b,this.ctx);}}export function exportDocument(a,b,c=0,d=0){if(c<this.field.length){const b=this.field[c],e=this.index.get(b),f=e.export(a,b,c,d=1);if(f&&f.then){const d=this;return f.then(function(){return d.export(a,b,c+1)})}return this.export(a,b,c+1)}else{let e,f;switch(d){case 0:e="reg",f=reg_to_json(this.reg),b=null;break;case 1:e="tag",f=ctx_to_json(this.tag,this.reg.size),b=null;break;case 2:e="doc",f=map_to_json(this.store),b=null;break;case 3:e="cfg",f={},b=null;break;default:return;}return save.call(this,a,b,e,f,c,d)}}export function importDocument(a,b){if(b){is_string(b)&&(b=JSON.parse(b)),a=a.split("."),"json"===a[a.length-1]&&a.pop();const c=2<a.length?a[0]:"";if(a=2<a.length?a[2]:a[1],!c)switch(a){case"reg":this.fastupdate=!1,this.reg=json_to_reg(b,this.reg);for(let a,b=0;b<this.field.length;b++)a=this.index.get(this.field[b]),a.fastupdate=!1,a.reg=this.reg;break;case"tag":this.tag=json_to_ctx(b,this.tag);break;case"doc":this.store=json_to_map(b,this.store);break;case"cfg":}else return this.index.get(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 788cda8..d89b7aa 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.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
+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||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 2b188fb..8141d6f 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.constructor !== Document) {
+    if (!this || this.constructor !== Document) {
         return new Document(options);
     }
 
@@ -40,8 +40,7 @@ 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 && [];
@@ -50,7 +49,8 @@ export default function Document(options) {
     this.cache = (tmp = options.cache || null) && new Cache(tmp);
     // do not apply cache again for the indexes since .searchCache()
     // is just a wrapper over .search()
-    options.cache = /* suggest */ /* append: */ /* enrich */!1;
+    options.cache =
+    /* suggest */ /* append: */ /* enrich */!1;
 
     this.worker = options.worker;
 
@@ -193,7 +193,7 @@ 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();
 };
 
diff --git a/dist/module/encoder.js b/dist/module/encoder.js
index 34818c3..9a2f956 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.constructor !== Encoder) {
+    if (!this || this.constructor !== Encoder) {
         return new Encoder(...arguments);
     }
 
diff --git a/dist/module/index.js b/dist/module/index.js
index 66cb8b9..344fbd5 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.constructor !== Index) {
+    if (!this || this.constructor !== Index) {
         return new Index(options);
     }
 
diff --git a/dist/module/resolver.js b/dist/module/resolver.js
index 516f731..63b7eec 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.constructor !== Resolver) {
+    if (!this || this.constructor !== Resolver) {
         return new Resolver(result);
     }
     if (result && result.index) {
diff --git a/dist/module/serialize.js b/dist/module/serialize.js
index 4883773..e2b82f6 100644
--- a/dist/module/serialize.js
+++ b/dist/module/serialize.js
@@ -1,81 +1,154 @@
 import Index from "./index.js";
 import Document from "./document.js";
-import { create_object, is_string } from "./common.js";
+import { is_string } from "./common.js";
 
-function map_to_json(map) {
-    const json = [];
+const chunk_size_reg = 250000,
+      chunk_size_map = 5000,
+      chunk_size_ctx = 1000;
+
+
+function map_to_json(map, size = 0) {
+    let chunk = [],
+        json = [];
+
+    if (size) {
+        size = 0 | chunk_size_map * (chunk_size_reg / size);
+    }
     for (const item of map.entries()) {
         json.push(item);
+        if (json.length === size) {
+            chunk.push(json);
+            json = [];
+        }
     }
-    return json;
+    json.length && chunk.push(json);
+    return chunk;
 }
 
-function ctx_to_json(ctx) {
-    const json = [];
-    for (const item of ctx.entries()) {
-        json.push(map_to_json(item));
+function json_to_map(json, map) {
+    map || (map = new Map());
+    for (let i = 0, entry; i < json.length; i++) {
+        entry = json[i];
+        map.set(entry[0], entry[1]);
     }
-    return json;
+    return map;
+}
+
+function ctx_to_json(ctx, size = 0) {
+    let chunk = [],
+        json = [];
+
+    if (size) {
+        size = 0 | chunk_size_ctx * (chunk_size_reg / size);
+    }
+    for (const item of ctx.entries()) {
+        const key = item[0],
+              value = item[1];
+
+        json.push([key, map_to_json(value)[0]]);
+        if (json.length === size) {
+            chunk.push(json);
+            json = [];
+        }
+    }
+    json.length && chunk.push(json);
+    return chunk;
+}
+
+function json_to_ctx(json, ctx) {
+    ctx || (ctx = new Map());
+    for (let i = 0, entry, map; i < json.length; i++) {
+        entry = json[i];
+        map = ctx.get(entry[0]);
+        ctx.set(entry[0], json_to_map(entry[1], map));
+    }
+    return ctx;
 }
 
 function reg_to_json(reg) {
-    const json = [];
+    let chunk = [],
+        json = [];
+
     for (const key of reg.keys()) {
         json.push(key);
+        if (json.length === chunk_size_reg) {
+            chunk.push(json);
+            json = [];
+        }
     }
-    return json;
+    json.length && chunk.push(json);
+    return chunk;
 }
 
-function save(callback, field, key, index_doc, index, data) {
+function json_to_reg(json, reg) {
+    reg || (reg = new Set());
+    for (let i = 0; i < json.length; i++) {
+        reg.add(json[i]);
+    }
+    return reg;
+}
 
-    const res = callback(field ? field + "." + key : key, JSON.stringify(data));
+/**
+ * @this {Index|Document}
+ */
+
+function save(callback, field, key, chunk, index_doc, index_obj, index_prt = 0) {
+    const is_arr = chunk && chunk.constructor === Array,
+          data = is_arr ? chunk.shift() : chunk;
+
+    if (!data) {
+        return this.export(callback, field, index_doc, index_obj + 1);
+    }
+
+    const res = callback((field ? field + "." : "") + (index_prt + 1) + "." + key, JSON.stringify(data));
 
     if (res && res.then) {
         const self = this;
         return res.then(function () {
-            return self.export(callback, field, index_doc, index + 1);
+            return save.call(self, callback, field, key, is_arr ? chunk : null, index_doc, index_obj, index_prt + 1);
         });
     }
 
-    return this.export(callback, field, index_doc, index + 1);
+    return save.call(this, callback, field, key, is_arr ? chunk : null, index_doc, index_obj, index_prt + 1);
 }
 
 /**
  * @param callback
  * @param field
  * @param index_doc
- * @param index
- * @this {Index|Document}
+ * @param index_obj
+ * @this {Index}
  */
 
-export function exportIndex(callback, field, index_doc, index = 0) {
+export function exportIndex(callback, field, index_doc, index_obj = 0) {
 
-    let key, data;
+    let key, chunk;
 
-    switch (index) {
+    switch (index_obj) {
 
         case 0:
 
             key = "reg";
-            data = reg_to_json(this.reg);
+            chunk = reg_to_json(this.reg);
             break;
 
         case 1:
 
+            // todo
             key = "cfg";
-            data = {};
+            chunk = {};
             break;
 
         case 2:
 
             key = "map";
-            data = map_to_json(this.map);
+            chunk = map_to_json(this.map, this.reg.size);
             break;
 
         case 3:
 
             key = "ctx";
-            data = ctx_to_json(this.ctx);
+            chunk = ctx_to_json(this.ctx, this.reg.size);
             break;
 
         default:
@@ -83,11 +156,11 @@ export function exportIndex(callback, field, index_doc, index = 0) {
             return;
     }
 
-    return save.call(this, callback, field, key, index_doc, index, data);
+    return save.call(this, callback, field, key, chunk, index_doc, index_obj);
 }
 
 /**
- * @this Index
+ * @this {Index}
  */
 
 export function importIndex(key, data) {
@@ -99,81 +172,88 @@ export function importIndex(key, data) {
         data = JSON.parse(data);
     }
 
+    key = key.split(".");
+    if ("json" === key[key.length - 1]) {
+        key.pop();
+    }
+    key = 1 < key.length ? key[1] : key[0];
+
     switch (key) {
 
         case "cfg":
+            // todo
             break;
 
         case "reg":
 
             // fast update isn't supported by export/import
             this.fastupdate = /* suggest */ /* append: */ /* enrich */!1;
-            this.reg = new Set(data);
+            this.reg = json_to_reg(data, this.reg);
             break;
 
         case "map":
 
-            this.map = new Map(data);
+            this.map = json_to_map(data, this.map);
             break;
 
         case "ctx":
 
-            this.ctx = new Map(data);
+            this.ctx = json_to_ctx(data, this.ctx);
             break;
     }
 }
 
 /**
- * @this Document
+ * @this {Document}
  */
 
-export function exportDocument(callback, field, index_doc = 0, index = 0) {
+export function exportDocument(callback, field, index_doc = 0, index_obj = 0) {
 
     if (index_doc < this.field.length) {
         const field = this.field[index_doc],
               idx = this.index.get(field),
-              res = idx.export(callback, field, index_doc, index = 1);
+              res = idx.export(callback, field, index_doc, index_obj = 1);
         // start from index 1, because document indexes does not additionally store register
 
         if (res && res.then) {
             const self = this;
             return res.then(function () {
-                return self.export(callback, field, index_doc + 1, index = 0);
+                return self.export(callback, field, index_doc + 1);
             });
         }
 
-        return this.export(callback, field, index_doc + 1, index = 0);
+        return this.export(callback, field, index_doc + 1);
     } else {
 
-        let key, data;
+        let key, chunk;
 
-        switch (index) {
+        switch (index_obj) {
 
             case 0:
 
                 key = "reg";
-                data = reg_to_json(this.reg);
+                chunk = reg_to_json(this.reg);
                 field = null;
                 break;
 
             case 1:
 
                 key = "tag";
-                data = ctx_to_json(this.tag);
+                chunk = ctx_to_json(this.tag, this.reg.size);
                 field = null;
                 break;
 
             case 2:
 
                 key = "doc";
-                data = map_to_json(this.store);
+                chunk = map_to_json(this.store);
                 field = null;
                 break;
 
             case 3:
 
                 key = "cfg";
-                data = {};
+                chunk = {};
                 field = null;
                 break;
 
@@ -182,12 +262,12 @@ export function exportDocument(callback, field, index_doc = 0, index = 0) {
                 return;
         }
 
-        return save.call(this, callback, field, key, index_doc, index, data);
+        return save.call(this, callback, field, key, chunk, index_doc, index_obj);
     }
 }
 
 /**
- * @this Document
+ * @this {Document}
  */
 
 export function importDocument(key, data) {
@@ -199,41 +279,49 @@ export function importDocument(key, data) {
         data = JSON.parse(data);
     }
 
-    switch (key) {
+    key = key.split(".");
+    if ("json" === key[key.length - 1]) {
+        key.pop();
+    }
+    const field = 2 < key.length ? key[0] : "";
+    key = 2 < key.length ? key[2] : key[1];
 
-        case "tag":
+    if (!field) {
 
-            this.tagindex = new Map(data);
-            break;
+        switch (key) {
 
-        case "reg":
+            case "reg":
 
-            // fast update isn't supported by export/import
-            this.fastupdate = !1;
-            this.reg = new Set(data);
+                // fast update isn't supported by export/import
+                this.fastupdate = !1;
+                this.reg = json_to_reg(data, this.reg);
 
-            for (let i = 0, idx; i < this.field.length; i++) {
-                idx = this.index.get(this.field[i]);
-                idx.fastupdate = !1;
-                idx.reg = this.reg;
-            }
+                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;
+                break;
 
-        case "doc":
+            case "tag":
 
-            this.store = new Map(data);
-            break;
+                this.tag = json_to_ctx(data, this.tag);
+                break;
 
-        default:
+            case "doc":
 
-            key = key.split(".");
-            const field = key[0];
-            key = key[1];
+                this.store = json_to_map(data, this.store);
+                break;
 
-            if (field && key) {
-                this.index.get(field).import(key, data);
-            }
+            case "cfg":
+
+                break;
+
+        }
+    } else {
+
+        return this.index.get(field).import(key, data);
     }
 }
 
@@ -312,89 +400,4 @@ export function serialize(withFunctionWrapper = /* tag? */ /* stringify */ /* st
     ctx = "index.ctx=new Map([" + ctx + "]);";
 
     return withFunctionWrapper ? "function inject(index){" + reg + map + ctx + "}" : reg + map + ctx;
-}
-
-// export function exportSnapshot(flexsearch){
-//
-//     if(!flexsearch.reg.size) return;
-//
-//     let reg = '';
-//     let type = "";
-//     for(const key of flexsearch.reg.keys()){
-//         type || (type = typeof key);
-//         reg += (reg ? ',' : '') + (type === "string" ? '"' + key + '"' : key);
-//     }
-//     reg = "f.reg=[" + reg + "];";
-//
-//     let map = '';
-//     for(const item of flexsearch.map.entries()){
-//         const key = item[0];
-//         const value = item[1];
-//         let res = '';
-//         for(let i = 0, ids; i < value.length; i++){
-//             ids = value[i] || [''];
-//             let str = '';
-//             for(let j = 0; j < ids.length; j++){
-//                 str += (str ? ',' : '') + (type === "string" ? '"' + ids[j] + '"' : ids[j]);
-//             }
-//             str = "[
-//             res += (res ? '|' : '') + str;
-//         }
-//         map += (map ? ';' : '') + key + ':' + res;
-//     }
-//
-//
-//     let ctx = '';
-//     for(const context of flexsearch.ctx.entries()){
-//         const key_ctx = context[0];
-//         const value_ctx = context[1];
-//
-//         for(const item of value_ctx.entries()){
-//             const key = item[0];
-//             const value = item[1];
-//
-//             let res = '';
-//             for(let i = 0, ids; i < value.length; i++){
-//                 ids = value[i] || [''];
-//                 let str = '';
-//                 for(let j = 0; j < ids.length; j++){
-//                     str += (str ? ',' : '') + (type === "string" ? '"' + ids[j] + '"' : ids[j]);
-//                 }
-//                 res += (res ? '|' : '') + str;
-//             }
-//             ctx += (ctx ? ';' : '') + key_ctx + '+' + key + ':' + res;
-//         }
-//     }
-//
-//     return reg + '#' + map + '#' + ctx;
-// }
-//
-// export function importSnapshot(flexsearch, input){
-//
-//     if(!input) return;
-//
-//     let pos_reg = input.indexOf("#");
-//     const reg = input.substring(0, pos_reg).split(",");
-//     flexsearch.reg = new Set(reg);
-//
-//     let pos_map = input.indexOf("#", pos_reg + 1);
-//     const map = input.substring(pos_reg + 1, pos_map).split(";").map(res => {
-//         const split = res.split(":");
-//         split[1] = split[1].split("|").map(ids => ids ? ids.split(",") : null);
-//         return split;
-//     });
-//     flexsearch.map = new Map(map);
-//
-//     input = input.substring(pos_map + 1);
-//     if(input){
-//         const ctx = input.split(";").map(res => {
-//             const split = res.split(":");
-//             const context = split[0].split("+");
-//             const map = new Map([
-//                 [context[1], split[1].split("|").map(ids => ids ? ids.split(",") : null)]
-//             ]);
-//             return [context[0], map]
-//         });
-//         flexsearch.ctx = new Map(ctx);
-//     }
-// }
\ No newline at end of file
+}
\ No newline at end of file
diff --git a/dist/module/worker.js b/dist/module/worker.js
index 2a23bd3..39ca44d 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.constructor !== WorkerIndex) {
+    if (!this || this.constructor !== WorkerIndex) {
         return new WorkerIndex(options);
     }
 
diff --git a/src/document.js b/src/document.js
index ed6cfdb..4c06d8c 100644
--- a/src/document.js
+++ b/src/document.js
@@ -38,7 +38,7 @@ import "./document/search.js";
 
 export default function Document(options){
 
-    if(this.constructor !== Document) {
+    if(!this || this.constructor !== Document) {
         return new Document(options);
     }
 
diff --git a/src/encoder.js b/src/encoder.js
index b316d47..3b55493 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.constructor !== Encoder){
+    if(!this || this.constructor !== Encoder){
         return new Encoder(...arguments);
     }
 
diff --git a/src/index.js b/src/index.js
index 44739d5..e3deaf8 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.constructor !== Index){
+    if(!this || this.constructor !== Index){
         return new Index(options);
     }
 
diff --git a/src/resolver.js b/src/resolver.js
index 2078d6f..75ebd5b 100644
--- a/src/resolver.js
+++ b/src/resolver.js
@@ -12,7 +12,7 @@ import "./resolve/not.js";
  */
 
 export default function Resolver(result){
-    if(this.constructor !== Resolver){
+    if(!this || this.constructor !== Resolver){
         return new Resolver(result);
     }
     if(result && result.index){
diff --git a/src/serialize.js b/src/serialize.js
index d1780ec..0c655e9 100644
--- a/src/serialize.js
+++ b/src/serialize.js
@@ -1,81 +1,173 @@
 import Index from "./index.js";
 import Document from "./document.js";
-import { create_object, is_string } from "./common.js";
+import { is_string } from "./common.js";
 
-function map_to_json(map){
-    const json = [];
+const chunk_size_reg = 250000;
+const chunk_size_map = 5000;
+const chunk_size_ctx = 1000;
+
+function map_to_json(map, size = 0){
+    let chunk = [];
+    let json = [];
+    if(size){
+        size = chunk_size_map * (chunk_size_reg / size) | 0;
+    }
     for(const item of map.entries()){
         json.push(item);
+        if(json.length === size){
+            chunk.push(json);
+            json = [];
+        }
     }
-    return json;
+    json.length && chunk.push(json);
+    return chunk;
 }
 
-function ctx_to_json(ctx){
-    const json = [];
-    for(const item of ctx.entries()){
-        json.push(map_to_json(item));
+function json_to_map(json, map){
+    map || (map = new Map());
+    for(let i = 0, entry; i < json.length; i++) {
+        entry = json[i];
+        map.set(entry[0], entry[1]);
     }
-    return json;
+    return map;
+}
+
+function ctx_to_json(ctx, size = 0){
+    let chunk = [];
+    let json = [];
+    if(size){
+        size = chunk_size_ctx * (chunk_size_reg / size) | 0;
+    }
+    for(const item of ctx.entries()){
+        const key = item[0];
+        const value = item[1];
+        json.push([key, map_to_json(value)[0]]);
+        if(json.length === size){
+            chunk.push(json);
+            json = [];
+        }
+    }
+    json.length && chunk.push(json);
+    return chunk;
+}
+
+function json_to_ctx(json, ctx){
+    ctx || (ctx = new Map());
+    for(let i = 0, entry, map; i < json.length; i++) {
+        entry = json[i];
+        map = ctx.get(entry[0]);
+        ctx.set(entry[0], json_to_map(entry[1], map));
+    }
+    return ctx;
 }
 
 function reg_to_json(reg){
-    const json = [];
+    let chunk = [];
+    let json = [];
     for(const key of reg.keys()){
         json.push(key);
+        if(json.length === chunk_size_reg){
+            chunk.push(json);
+            json = [];
+        }
     }
-    return json;
+    json.length && chunk.push(json);
+    return chunk;
 }
 
-function save(callback, field, key, index_doc, index, data){
+function json_to_reg(json, reg){
+    reg || (reg = new Set());
+    for(let i = 0; i < json.length; i++) {
+        reg.add(json[i]);
+    }
+    return reg;
+}
 
-    const res = callback(field ? field + "." + key : key, JSON.stringify(data));
+/**
+ * @this {Index|Document}
+ */
+
+function save(callback, field, key, chunk, index_doc, index_obj, index_prt = 0){
+
+    const is_arr = chunk && chunk.constructor === Array;
+    const data = is_arr ? chunk.shift() : chunk;
+    if(!data){
+        return this.export(
+            callback,
+            field,
+            index_doc,
+            index_obj + 1
+        );
+    }
+
+    const res = callback(
+        (field ? field + "." : "") + (index_prt + 1) + "." + key,
+        JSON.stringify(data)
+    );
 
     if(res && res["then"]){
         const self = this;
         return res["then"](function(){
-            return self.export(callback, field, index_doc, index + 1);
+            return save.call(self,
+                callback,
+                field,
+                key,
+                is_arr ? chunk : null,
+                index_doc,
+                index_obj,
+                index_prt + 1
+            );
         });
     }
 
-    return this.export(callback, field, index_doc, index + 1);
+    return save.call(this,
+        callback,
+        field,
+        key,
+        is_arr ? chunk : null,
+        index_doc,
+        index_obj,
+        index_prt + 1
+    );
 }
 
 /**
  * @param callback
  * @param field
  * @param index_doc
- * @param index
- * @this {Index|Document}
+ * @param index_obj
+ * @this {Index}
  */
 
-export function exportIndex(callback, field, index_doc, index = 0){
+export function exportIndex(callback, field, index_doc, index_obj = 0){
 
-    let key, data;
+    let key, chunk;
 
-    switch(index){
+    switch(index_obj){
 
         case 0:
 
             key = "reg";
-            data = reg_to_json(this.reg);
+            chunk = reg_to_json(this.reg);
             break;
 
         case 1:
 
+            // todo
             key = "cfg";
-            data = {};
+            chunk = {};
             break;
 
         case 2:
 
             key = "map";
-            data = map_to_json(this.map);
+            chunk = map_to_json(this.map, this.reg.size);
             break;
 
         case 3:
 
             key = "ctx";
-            data = ctx_to_json(this.ctx);
+            chunk = ctx_to_json(this.ctx, this.reg.size);
             break;
 
         default:
@@ -83,11 +175,18 @@ export function exportIndex(callback, field, index_doc, index = 0){
             return;
     }
 
-    return save.call(this, callback, field, key, index_doc, index, data);
+    return save.call(this,
+        callback,
+        field,
+        key,
+        chunk,
+        index_doc,
+        index_obj
+    );
 }
 
 /**
- * @this Index
+ * @this {Index}
  */
 
 export function importIndex(key, data){
@@ -99,83 +198,90 @@ export function importIndex(key, data){
         data = JSON.parse(data);
     }
 
+    key = key.split(".");
+    if(key[key.length - 1] === "json"){
+        key.pop();
+    }
+    key = key.length > 1 ? key[1] : key[0];
+
     switch(key){
 
         case "cfg":
+            // todo
             break;
 
         case "reg":
 
             // fast update isn't supported by export/import
             this.fastupdate = false;
-            this.reg = new Set(data);
+            this.reg = json_to_reg(data, this.reg);
             break;
 
         case "map":
 
-            this.map = new Map(data);
+            this.map = json_to_map(data, this.map);
             break;
 
         case "ctx":
 
-            this.ctx = new Map(data);
+            this.ctx = json_to_ctx(data, this.ctx);
             break;
     }
 }
 
 /**
- * @this Document
+ * @this {Document}
  */
 
-export function exportDocument(callback, field, index_doc = 0, index = 0){
+export function exportDocument(callback, field, index_doc = 0, index_obj = 0){
 
     if(index_doc < this.field.length){
 
         const field = this.field[index_doc];
         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);
+        const res = idx.export(callback, field, index_doc, index_obj = 1);
 
         if(res && res["then"]){
             const self = this;
             return res["then"](function(){
-                return self.export(callback, field, index_doc + 1, index = 0);
+                return self.export(callback, field, index_doc + 1);
             });
         }
 
-        return this.export(callback, field, index_doc + 1, index = 0);
+        return this.export(callback, field, index_doc + 1);
     }
     else{
 
-        let key, data;
+        let key, chunk;
 
-        switch(index){
+        switch(index_obj){
 
             case 0:
 
                 key = "reg";
-                data = reg_to_json(this.reg);
+                chunk = reg_to_json(this.reg);
                 field = null;
                 break;
 
             case 1:
 
                 key = "tag";
-                data = ctx_to_json(this.tag);
+                chunk = ctx_to_json(this.tag, this.reg.size);
                 field = null;
                 break;
 
             case 2:
 
                 key = "doc";
-                data = map_to_json(this.store);
+                chunk = map_to_json(this.store);
                 field = null;
                 break;
 
             case 3:
 
                 key = "cfg";
-                data = {};
+                chunk = {};
                 field = null;
                 break;
 
@@ -184,12 +290,19 @@ export function exportDocument(callback, field, index_doc = 0, index = 0){
                 return;
         }
 
-        return save.call(this, callback, field, key, index_doc, index, data);
+        return save.call(this,
+            callback,
+            field,
+            key,
+            chunk,
+            index_doc,
+            index_obj
+        );
     }
 }
 
 /**
- * @this Document
+ * @this {Document}
  */
 
 export function importDocument(key, data){
@@ -201,41 +314,50 @@ export function importDocument(key, data){
         data = JSON.parse(data);
     }
 
-    switch(key){
+    key = key.split(".");
+    if(key[key.length - 1] === "json"){
+        key.pop();
+    }
+    const field = key.length > 2 ? key[0] : "";
+    key = key.length > 2 ? key[2] : key[1];
 
-        case "tag":
+    if(!field){
 
-            this.tagindex = new Map(data);
-            break;
+        switch(key){
 
-        case "reg":
+            case "reg":
 
-            // fast update isn't supported by export/import
-            this.fastupdate = false;
-            this.reg = new Set(data);
+                // fast update isn't supported by export/import
+                this.fastupdate = false;
+                this.reg = json_to_reg(data, this.reg);
 
-            for(let i = 0, idx; i < this.field.length; i++){
-                idx = this.index.get(this.field[i]);
-                idx.fastupdate = false;
-                idx.reg = this.reg;
-            }
+                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;
+                break;
 
-        case "doc":
+            case "tag":
 
-            this.store = new Map(data);
-            break;
+                this.tag = json_to_ctx(data, this.tag);
+                break;
 
-        default:
+            case "doc":
 
-            key = key.split(".");
-            const field = key[0];
-            key = key[1];
+                this.store = json_to_map(data, this.store);
+                break;
 
-            if(field && key){
-                this.index.get(field).import(key, data);
-            }
+            case "cfg":
+
+                break;
+
+        }
+    }
+    else{
+
+        return this.index.get(field).import(key, data);
     }
 }
 
@@ -312,88 +434,3 @@ export function serialize(withFunctionWrapper = true){
         ? "function inject(index){" + reg + map + ctx + "}"
         : reg + map + ctx
 }
-
-// export function exportSnapshot(flexsearch){
-//
-//     if(!flexsearch.reg.size) return;
-//
-//     let reg = '';
-//     let type = "";
-//     for(const key of flexsearch.reg.keys()){
-//         type || (type = typeof key);
-//         reg += (reg ? ',' : '') + (type === "string" ? '"' + key + '"' : key);
-//     }
-//     reg = "f.reg=[" + reg + "];";
-//
-//     let map = '';
-//     for(const item of flexsearch.map.entries()){
-//         const key = item[0];
-//         const value = item[1];
-//         let res = '';
-//         for(let i = 0, ids; i < value.length; i++){
-//             ids = value[i] || [''];
-//             let str = '';
-//             for(let j = 0; j < ids.length; j++){
-//                 str += (str ? ',' : '') + (type === "string" ? '"' + ids[j] + '"' : ids[j]);
-//             }
-//             str = "[
-//             res += (res ? '|' : '') + str;
-//         }
-//         map += (map ? ';' : '') + key + ':' + res;
-//     }
-//
-//
-//     let ctx = '';
-//     for(const context of flexsearch.ctx.entries()){
-//         const key_ctx = context[0];
-//         const value_ctx = context[1];
-//
-//         for(const item of value_ctx.entries()){
-//             const key = item[0];
-//             const value = item[1];
-//
-//             let res = '';
-//             for(let i = 0, ids; i < value.length; i++){
-//                 ids = value[i] || [''];
-//                 let str = '';
-//                 for(let j = 0; j < ids.length; j++){
-//                     str += (str ? ',' : '') + (type === "string" ? '"' + ids[j] + '"' : ids[j]);
-//                 }
-//                 res += (res ? '|' : '') + str;
-//             }
-//             ctx += (ctx ? ';' : '') + key_ctx + '+' + key + ':' + res;
-//         }
-//     }
-//
-//     return reg + '#' + map + '#' + ctx;
-// }
-//
-// export function importSnapshot(flexsearch, input){
-//
-//     if(!input) return;
-//
-//     let pos_reg = input.indexOf("#");
-//     const reg = input.substring(0, pos_reg).split(",");
-//     flexsearch.reg = new Set(reg);
-//
-//     let pos_map = input.indexOf("#", pos_reg + 1);
-//     const map = input.substring(pos_reg + 1, pos_map).split(";").map(res => {
-//         const split = res.split(":");
-//         split[1] = split[1].split("|").map(ids => ids ? ids.split(",") : null);
-//         return split;
-//     });
-//     flexsearch.map = new Map(map);
-//
-//     input = input.substring(pos_map + 1);
-//     if(input){
-//         const ctx = input.split(";").map(res => {
-//             const split = res.split(":");
-//             const context = split[0].split("+");
-//             const map = new Map([
-//                 [context[1], split[1].split("|").map(ids => ids ? ids.split(",") : null)]
-//             ]);
-//             return [context[0], map]
-//         });
-//         flexsearch.ctx = new Map(ctx);
-//     }
-// }
diff --git a/src/worker.js b/src/worker.js
index e69c36d..4b160f8 100644
--- a/src/worker.js
+++ b/src/worker.js
@@ -11,7 +11,7 @@ let pid = 0;
 
 export default function WorkerIndex(options = {}){
 
-    if(this.constructor !== WorkerIndex) {
+    if(!this || this.constructor !== WorkerIndex) {
         return new WorkerIndex(options);
     }
 
diff --git a/task/build.js b/task/build.js
index d653ac8..a72fac4 100644
--- a/task/build.js
+++ b/task/build.js
@@ -136,6 +136,16 @@ if(release === "lang"){
     fs.cpSync("src/", "tmp/", { recursive: true });
     fs.copyFileSync("src/db/interface.js", "tmp/db/interface.js");
 
+    // add the eval wrapper
+    let content = fs.readFileSync("tmp/worker/handler.js", "utf8");
+    content = content.replace('options = (await import(filepath))["default"];', '//options = (await import(filepath))["default"];');
+    fs.writeFileSync("tmp/worker/handler.js", content);
+
+    // add the eval wrapper
+    content = fs.readFileSync("tmp/worker.js", "utf8");
+    content = content.replace("import.meta.url", '(1,eval)("import.meta.url")');
+    fs.writeFileSync("tmp/worker.js", content);
+
     (function next(x, y, z){
 
         if(x < supported_lang.length){
@@ -143,7 +153,6 @@ if(release === "lang"){
             (function(lang){
 
                 //fs.copyFileSync("src/lang/" + lang + ".js", "tmp/lang/" + lang + ".js");
-
                 //console.log(lang)
 
                 fs.writeFileSync("tmp/lang.js", `