diff --git a/dist/flexsearch.bundle.debug.js b/dist/flexsearch.bundle.debug.js
index a6d9f61..67af393 100644
--- a/dist/flexsearch.bundle.debug.js
+++ b/dist/flexsearch.bundle.debug.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.111 (Bundle/Debug)
+ * FlexSearch.js v0.8.113 (Bundle/Debug)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -272,12 +272,13 @@ function L(a) {
 ;let M, N;
 async function ka(a) {
   a = a.data;
-  const b = a.task, c = a.id;
+  var b = a.task;
+  const c = a.id;
   let e = a.args;
   switch(b) {
     case "init":
       N = a.options || {};
-      (a = a.factory) ? (Function("return " + a)()(self), M = new self.FlexSearch.Index(N), delete self.FlexSearch) : M = new O(N);
+      (b = a.factory) ? (Function("return " + b)()(self), M = new self.FlexSearch.Index(N), delete self.FlexSearch) : M = new O(N);
       postMessage({id:c});
       break;
     default:
@@ -286,15 +287,15 @@ async function ka(a) {
         if (!N.export || "function" !== typeof N.export) {
           throw Error('Either no extern configuration provided for the Worker-Index or no method was defined on the config property "export".');
         }
-        e = [N.export];
+        e[1] ? (e[0] = N.export, e[2] = 0, e[3] = 1) : e = null;
       }
       if ("import" === b) {
         if (!N.import || "function" !== typeof N.import) {
           throw Error('Either no extern configuration provided for the Worker-Index or no method was defined on the config property "import".');
         }
-        await N.import.call(M, M);
+        e[0] && (a = await N.import.call(M, e[0]), M.import(e[0], a));
       } else {
-        d = M[b].apply(M, e), d.then && (d = await d);
+        (d = e && M[b].apply(M, e)) && d.then && (d = await d);
       }
       postMessage("search" === b ? {id:c, msg:d} : {id:c});
   }
@@ -378,13 +379,15 @@ R("remove");
 R("clear");
 R("export");
 R("import");
+la(Q.prototype);
 function R(a) {
-  Q.prototype[a] = Q.prototype[a + "Async"] = async function() {
+  Q.prototype[a] = function() {
     const b = this, c = [].slice.call(arguments);
     var e = c[c.length - 1];
     let d;
-    "function" === typeof e && (d = e, c.splice(c.length - 1, 1));
+    "function" === typeof e && (d = e, c.pop());
     e = new Promise(function(f) {
+      "export" === a && "function" === typeof c[0] && (c[0] = null);
       b.h[++ra] = f;
       b.worker.postMessage({task:a, id:ra, args:c});
     });
@@ -392,7 +395,7 @@ function R(a) {
   };
 }
 function sa(a, b, c) {
-  return b ? "undefined" !== typeof module ? new (require("worker_threads")["Worker"])(__dirname + "/node/node.js") : import("worker_threads").then(function(worker){ return new worker["Worker"]((1,eval)("import.meta.dirname") + "/node/node.mjs"); }) : a ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + ka.toString()], {type:"text/javascript"}))) : new window.Worker(E(c) ? c : (0,eval)("import.meta.url").replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", 
+  return b ? "undefined" !== typeof module ? new (require("worker_threads")["Worker"])(__dirname + "/node/node.js") : import("worker_threads").then(function(worker){ return new worker["Worker"]((1,eval)("import.meta.dirname") + "/node/node.mjs"); }) : a ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + ka.toString()], {type:"text/javascript"}))) : new window.Worker("string" === typeof c ? c : (0,eval)("import.meta.url").replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", 
   "module/worker/worker.js"), {type:"module"});
 }
 ;function ta(a, b = 0) {
@@ -726,6 +729,7 @@ function Ba(a) {
       }
       this.store.set(a, k || b);
     }
+    this.worker && (this.fastupdate || this.reg.add(a));
   }
   return this;
 };
@@ -1708,21 +1712,31 @@ t.export = function(a, b, c = 0, e = 0) {
   return za.call(this, a, b, d, f, c, e);
 };
 t.import = function(a, b) {
+  var c = a.split(".");
+  "json" === c[c.length - 1] && c.pop();
+  const e = 2 < c.length ? c[0] : "";
+  c = 2 < c.length ? c[2] : c[1];
+  if (this.worker && e) {
+    return this.index.get(e).import(a);
+  }
   if (b) {
     "string" === typeof 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);
+    if (e) {
+      return this.index.get(e).import(c, b);
     }
-    switch(a) {
+    switch(c) {
       case "reg":
         this.fastupdate = !1;
         this.reg = ya(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;
+        for (let d = 0, f; d < this.field.length; d++) {
+          f = this.index.get(this.field[d]), f.fastupdate = !1, f.reg = this.reg;
+        }
+        if (this.worker) {
+          b = [];
+          for (const d of this.index.values()) {
+            b.push(d.import(a));
+          }
+          return Promise.all(b);
         }
         break;
       case "tag":
@@ -2143,7 +2157,7 @@ t.export = function(a, b, c = 0, e = 0) {
 };
 t.import = function(a, b) {
   if (b) {
-    switch("string" === typeof b && (b = JSON.parse(b)), a = a.split("."), "json" === a[a.length - 1] && a.pop(), a = 1 < a.length ? a[1] : a[0], a) {
+    switch("string" === typeof b && (b = JSON.parse(b)), a = a.split("."), "json" === a[a.length - 1] && a.pop(), 3 === a.length && a.shift(), a = 1 < a.length ? a[1] : a[0], a) {
       case "reg":
         this.fastupdate = !1;
         this.reg = ya(b, this.reg);
diff --git a/dist/flexsearch.bundle.min.js b/dist/flexsearch.bundle.min.js
index 9d8e6af..f0f2149 100644
--- a/dist/flexsearch.bundle.min.js
+++ b/dist/flexsearch.bundle.min.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.111 (Bundle)
+ * FlexSearch.js v0.8.113 (Bundle)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -21,12 +21,12 @@ t.addMatcher=function(a,b){if("object"===typeof a)return this.addReplacer(a,b);i
 t.encode=function(a){if(this.cache&&a.length<=this.K)if(this.H){if(this.B.has(a))return this.B.get(a)}else this.H=setTimeout(L,50,this);this.normalize&&("function"===typeof this.normalize?a=this.normalize(a):a=ja?a.normalize("NFKD").replace(ja,"").toLowerCase():a.toLowerCase());this.prepare&&(a=this.prepare(a));this.numeric&&3<a.length&&(a=a.replace(ha,"$1 $2").replace(ia,"$1 $2").replace(fa,"$1 "));const b=!(this.dedupe||this.mapper||this.filter||this.matcher||this.stemmer||this.replacer);let c=
 [],e=this.split||""===this.split?a.split(this.split):a;for(let f=0,g,k;f<e.length;f++)if((g=k=e[f])&&!(g.length<this.minlength))if(b)c.push(g);else if(!this.filter||!this.filter.has(g)){if(this.cache&&g.length<=this.L)if(this.H){var d=this.G.get(g);if(d||""===d){d&&c.push(d);continue}}else this.H=setTimeout(L,50,this);this.stemmer&&2<g.length&&(this.N||(this.N=new RegExp("(?!^)("+this.A+")$")),g=g.replace(this.N,h=>this.stemmer.get(h)),g.length<this.minlength||this.filter&&this.filter.has(g))&&(g=
 "");if(g&&(this.mapper||this.dedupe&&1<g.length)){d="";for(let h=0,l="",m,n;h<g.length;h++)m=g.charAt(h),m===l&&this.dedupe||((n=this.mapper&&this.mapper.get(m))||""===n?n===l&&this.dedupe||!(l=n)||(d+=n):d+=l=m);g=d}this.matcher&&1<g.length&&(this.M||(this.M=new RegExp("("+this.h+")","g")),g=g.replace(this.M,h=>this.matcher.get(h)));if(g&&this.replacer)for(d=0;g&&d<this.replacer.length;d+=2)g=g.replace(this.replacer[d],this.replacer[d+1]);this.cache&&k.length<=this.L&&(this.G.set(k,g),this.G.size>
-this.S&&(this.G.clear(),this.L=this.L/1.1|0));g&&c.push(g)}this.finalize&&(c=this.finalize(c)||c);this.cache&&a.length<=this.K&&(this.B.set(a,c),this.B.size>this.S&&(this.B.clear(),this.K=this.K/1.1|0));return c};function L(a){a.H=null;a.B.clear();a.G.clear()};let M,N;async function ka(a){a=a.data;const b=a.task,c=a.id;let e=a.args;switch(b){case "init":N=a.options||{};(a=a.factory)?(Function("return "+a)()(self),M=new self.FlexSearch.Index(N),delete self.FlexSearch):M=new O(N);postMessage({id:c});break;default:let d;"export"===b&&(e=[N.export]);"import"===b?await N.import.call(M,M):(d=M[b].apply(M,e),d.then&&(d=await d));postMessage("search"===b?{id:c,msg:d}:{id:c})}};function la(a){P.call(a,"add");P.call(a,"append");P.call(a,"search");P.call(a,"update");P.call(a,"remove")}let ma,na;const oa={},pa={};function qa(a){ma=0;oa[a]=pa[a]}
+this.S&&(this.G.clear(),this.L=this.L/1.1|0));g&&c.push(g)}this.finalize&&(c=this.finalize(c)||c);this.cache&&a.length<=this.K&&(this.B.set(a,c),this.B.size>this.S&&(this.B.clear(),this.K=this.K/1.1|0));return c};function L(a){a.H=null;a.B.clear();a.G.clear()};let M,N;async function ka(a){a=a.data;var b=a.task;const c=a.id;let e=a.args;switch(b){case "init":N=a.options||{};(b=a.factory)?(Function("return "+b)()(self),M=new self.FlexSearch.Index(N),delete self.FlexSearch):M=new O(N);postMessage({id:c});break;default:let d;"export"===b&&(e[1]?(e[0]=N.export,e[2]=0,e[3]=1):e=null);"import"===b?e[0]&&(a=await N.import.call(M,e[0]),M.import(e[0],a)):(d=e&&M[b].apply(M,e))&&d.then&&(d=await d);postMessage("search"===b?{id:c,msg:d}:{id:c})}};function la(a){P.call(a,"add");P.call(a,"append");P.call(a,"search");P.call(a,"update");P.call(a,"remove")}let ma,na;const oa={},pa={};function qa(a){ma=0;oa[a]=pa[a]}
 function P(a){this[a+"Async"]=function(){const b=arguments;var c=b[b.length-1];let e;"function"===typeof c&&(e=c,delete b[b.length-1]);ma||(ma=setTimeout(qa,0,a),na=Date.now());pa[a]||(pa[a]=oa[a]=1E3);if(!--oa[a]){oa[a]=pa[a]=pa[a]*this.priority*this.priority*3/(Date.now()-na)|0||1;ma=clearTimeout(ma);const f=this;return new Promise(g=>{setTimeout(function(){g(f[a+"Async"].apply(f,b))},0)})}const d=this[a].apply(this,b);c=d.then?d:new Promise(f=>f(d));e&&c.then(e);return c}};let ra=0;
 function Q(a={}){function b(g){function k(h){h=h.data||h;const l=h.id,m=l&&d.h[l];m&&(m(h.msg),delete d.h[l])}this.worker=g;this.h=B();if(this.worker){e?this.worker.on("message",k):this.worker.onmessage=k;if(a.config)return new Promise(function(h){d.h[++ra]=function(){h(d)};d.worker.postMessage({id:ra,task:"init",factory:c,options:a})});this.worker.postMessage({task:"init",factory:c,options:a});return this}}if(!this||this.constructor!==Q)return new Q(a);let c="undefined"!==typeof self?self._factory:"undefined"!==
-typeof window?window._factory:null;c&&(c=c.toString());const e="undefined"===typeof window,d=this,f=sa(c,e,a.worker);return f.then?f.then(function(g){return b.call(d,g)}):b.call(this,f)}R("add");R("append");R("search");R("update");R("remove");R("clear");R("export");R("import");
-function R(a){Q.prototype[a]=Q.prototype[a+"Async"]=async function(){const b=this,c=[].slice.call(arguments);var e=c[c.length-1];let d;"function"===typeof e&&(d=e,c.splice(c.length-1,1));e=new Promise(function(f){b.h[++ra]=f;b.worker.postMessage({task:a,id:ra,args:c})});return d?(e.then(d),this):e}}
-function sa(a,b,c){return b?"undefined"!==typeof module?new (require("worker_threads")["Worker"])(__dirname + "/node/node.js"):import("worker_threads").then(function(worker){ return new worker["Worker"]((1,eval)("import.meta.dirname") + "/node/node.mjs"); }):a?new window.Worker(URL.createObjectURL(new Blob(["onmessage="+ka.toString()],{type:"text/javascript"}))):new window.Worker(E(c)?c:(0,eval)("import.meta.url").replace("/worker.js","/worker/worker.js").replace("flexsearch.bundle.module.min.js",
+typeof window?window._factory:null;c&&(c=c.toString());const e="undefined"===typeof window,d=this,f=sa(c,e,a.worker);return f.then?f.then(function(g){return b.call(d,g)}):b.call(this,f)}R("add");R("append");R("search");R("update");R("remove");R("clear");R("export");R("import");la(Q.prototype);
+function R(a){Q.prototype[a]=function(){const b=this,c=[].slice.call(arguments);var e=c[c.length-1];let d;"function"===typeof e&&(d=e,c.pop());e=new Promise(function(f){"export"===a&&"function"===typeof c[0]&&(c[0]=null);b.h[++ra]=f;b.worker.postMessage({task:a,id:ra,args:c})});return d?(e.then(d),this):e}}
+function sa(a,b,c){return b?"undefined"!==typeof module?new (require("worker_threads")["Worker"])(__dirname + "/node/node.js"):import("worker_threads").then(function(worker){ return new worker["Worker"]((1,eval)("import.meta.dirname") + "/node/node.mjs"); }):a?new window.Worker(URL.createObjectURL(new Blob(["onmessage="+ka.toString()],{type:"text/javascript"}))):new window.Worker("string"===typeof c?c:(0,eval)("import.meta.url").replace("/worker.js","/worker/worker.js").replace("flexsearch.bundle.module.min.js",
 "module/worker/worker.js"),{type:"module"})};function ta(a,b=0){let c=[],e=[];b&&(b=25E4/b*5E3|0);for(const d of a.entries())e.push(d),e.length===b&&(c.push(e),e=[]);e.length&&c.push(e);return c}function ua(a,b){b||(b=new Map);for(let c=0,e;c<a.length;c++)e=a[c],b.set(e[0],e[1]);return b}function va(a,b=0){let c=[],e=[];b&&(b=25E4/b*1E3|0);for(const d of a.entries())e.push([d[0],ta(d[1])[0]]),e.length===b&&(c.push(e),e=[]);e.length&&c.push(e);return c}
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 function za(a,b,c,e,d,f,g=0){const k=e&&e.constructor===Array;var h=k?e.shift():e;if(!h)return this.export(a,b,d,f+1);if((h=a((b?b+".":"")+(g+1)+"."+c,JSON.stringify(h)))&&h.then){const l=this;return h.then(function(){return za.call(l,a,b,c,k?e:null,d,f,g+1)})}return za.call(this,a,b,c,k?e:null,d,f,g+1)};function Aa(a,b,c,e){let d=[];for(let f=0,g;f<a.index.length;f++)if(g=a.index[f],b>=g.length)b-=g.length;else{b=g[e?"splice":"slice"](b,c);const k=b.length;if(k&&(d=d.length?d.concat(b):b,c-=k,e&&(a.length-=k),!c))break;b=0}return d}
@@ -37,7 +37,7 @@ function U(a=8){if(!this)return new U(a);this.index=B();this.h=[];32<a?(this.B=B
 t.clear=U.prototype.clear=function(){this.index=B();this.h=[];this.size=0};t.values=U.prototype.values=function*(){for(let a=0;a<this.h.length;a++)for(let b of this.h[a].values())yield b};t.keys=U.prototype.keys=function*(){for(let a=0;a<this.h.length;a++)for(let b of this.h[a].keys())yield b};t.entries=U.prototype.entries=function*(){for(let a=0;a<this.h.length;a++)for(let b of this.h[a].entries())yield b};
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 function Ga(a,b,c,e,d){const f=[],g=B();let k;var h=a.length;let l;if(e)for(d=h-1;0<=d;d--){if(l=(e=a[d])&&e.length)for(h=0;h<l;h++)if(k=e[h],!g[k])if(g[k]=1,c)c--;else if(f.push(k),f.length===b)return f}else for(let m=h-1,n,p=0;0<=m;m--){n=a[m];for(let q=0;q<n.length;q++)if(l=(e=n[q])&&e.length)for(let r=0;r<l;r++)if(k=e[r],!g[k])if(g[k]=1,c)c--;else{let u=(q+(m<h-1?d||0:0))/(m+1)|0;(f[u]||(f[u]=[])).push(k);if(++p===b)return f}}return f}
@@ -66,7 +66,8 @@ t.remove=function(a){I(a)&&(a=ba(a,this.key));for(var b of this.index.values())b
 t.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};t.contain=function(a){return this.db?this.index.get(this.field[0]).db.has(a):this.reg.has(a)};t.cleanup=function(){for(const a of this.index.values())a.cleanup();return this};t.get=function(a){return this.db?this.index.get(this.field[0]).db.enrich(a).then(function(b){return b[0]&&b[0].doc}):this.store.get(a)};
 t.set=function(a,b){this.store.set(a,b);return this};t.searchCache=Va;
 t.export=function(a,b,c=0,e=0){if(c<this.field.length){const g=this.field[c];if((b=this.index.get(g).export(a,g,c,e=1))&&b.then){const k=this;return b.then(function(){return k.export(a,g,c+1)})}return this.export(a,g,c+1)}let d,f;switch(e){case 0:d="reg";f=xa(this.reg);b=null;break;case 1:d="tag";f=va(this.tag,this.reg.size);b=null;break;case 2:d="doc";f=ta(this.store);b=null;break;case 3:d="cfg";b=f=null;break;default:return}return za.call(this,a,b,d,f,c,e)};
-t.import=function(a,b){if(b){"string"===typeof 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=ya(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=wa(b,this.tag);break;case "doc":this.store=ua(b,this.store)}}};la(V.prototype);function Va(a,b,c){a=("object"===typeof a?""+a.query:a).toLowerCase();this.cache||(this.cache=new Y);let e=this.cache.get(a);if(!e){e=this.search(a,b,c);if(e.then){const d=this;e.then(function(f){d.cache.set(a,f);return f})}this.cache.set(a,e)}return e}function Y(a){this.limit=a&&!0!==a?a:1E3;this.cache=new Map;this.h=""}Y.prototype.set=function(a,b){this.cache.set(this.h=a,b);this.cache.size>this.limit&&this.cache.delete(this.cache.keys().next().value)};
+t.import=function(a,b){var c=a.split(".");"json"===c[c.length-1]&&c.pop();const e=2<c.length?c[0]:"";c=2<c.length?c[2]:c[1];if(this.worker&&e)return this.index.get(e).import(a);if(b){"string"===typeof b&&(b=JSON.parse(b));if(e)return this.index.get(e).import(c,b);switch(c){case "reg":this.fastupdate=!1;this.reg=ya(b,this.reg);for(let d=0,f;d<this.field.length;d++)f=this.index.get(this.field[d]),f.fastupdate=!1,f.reg=this.reg;if(this.worker){b=[];for(const d of this.index.values())b.push(d.import(a));
+return Promise.all(b)}break;case "tag":this.tag=wa(b,this.tag);break;case "doc":this.store=ua(b,this.store)}}};la(V.prototype);function Va(a,b,c){a=("object"===typeof a?""+a.query:a).toLowerCase();this.cache||(this.cache=new Y);let e=this.cache.get(a);if(!e){e=this.search(a,b,c);if(e.then){const d=this;e.then(function(f){d.cache.set(a,f);return f})}this.cache.set(a,e)}return e}function Y(a){this.limit=a&&!0!==a?a:1E3;this.cache=new Map;this.h=""}Y.prototype.set=function(a,b){this.cache.set(this.h=a,b);this.cache.size>this.limit&&this.cache.delete(this.cache.keys().next().value)};
 Y.prototype.get=function(a){const b=this.cache.get(a);b&&this.h!==a&&(this.cache.delete(a),this.cache.set(this.h=a,b));return b};Y.prototype.remove=function(a){for(const b of this.cache){const c=b[0];b[1].includes(a)&&this.cache.delete(c)}};Y.prototype.clear=function(){this.cache.clear();this.h=""};const Wa={normalize:function(a){return a.toLowerCase()}};const Xa=new Map([["b","p"],["v","f"],["w","f"],["z","s"],["x","s"],["d","t"],["n","m"],["c","k"],["g","k"],["j","k"],["q","k"],["i","e"],["y","e"],["u","o"]]);const Ya=new Map([["ae","a"],["oe","o"],["sh","s"],["kh","k"],["th","t"],["pf","f"]]),Za=[/([^aeo])h(.)/g,"$1$2",/([aeo])h([^aeo]|$)/g,"$1$2",/([^0-9])\1+/g,"$1"];const $a={a:"",e:"",i:"",o:"",u:"",y:"",b:1,f:1,p:1,v:1,c:2,g:2,j:2,k:2,q:2,s:2,x:2,z:2,"\u00df":2,d:3,t:3,l:4,m:5,n:5,r:6};const ab=/[\x00-\x7F]+/g;const bb=/[\x00-\x7F]+/g;const cb=/[\x00-\x7F]+/g;var db={LatinExact:{normalize:!1,dedupe:!1},LatinDefault:Wa,LatinSimple:{normalize:!0,dedupe:!0},LatinBalance:{normalize:!0,dedupe:!0,mapper:Xa},LatinAdvanced:{normalize:!0,dedupe:!0,mapper:Xa,matcher:Ya,replacer:Za},LatinExtra:{normalize:!0,dedupe:!0,mapper:Xa,replacer:Za.concat([/(?!^)[aeo]/g,""]),matcher:Ya},LatinSoundex:{normalize:!0,dedupe:!1,include:{letter:!0},finalize:function(a){for(let c=0;c<a.length;c++){var b=a[c];let e=b.charAt(0),d=$a[e];for(let f=1,g;f<b.length&&(g=b.charAt(f),"h"===
 g||"w"===g||!(g=$a[g])||g===d||(e+=g,d=g,4!==e.length));f++);a[c]=e}}},ArabicDefault:{rtl:!0,normalize:!1,dedupe:!0,prepare:function(a){return(""+a).replace(ab," ")}},CjkDefault:{normalize:!1,dedupe:!0,split:"",prepare:function(a){return(""+a).replace(bb,"")}},CyrillicDefault:{normalize:!1,dedupe:!0,prepare:function(a){return(""+a).replace(cb," ")}}};const eb={memory:{resolution:1},performance:{resolution:6,fastupdate:!0,context:{depth:1,resolution:3}},match:{tokenize:"forward"},score:{resolution:9,context:{depth:2,resolution:9}}};O.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=B(),m=B(),n=this.depth,p=this.resolution;for(let q=0;q<e;q++){let r=b[this.rtl?e-1-q:q];var d=r.length;if(d&&(n||!m[r])){var f=this.score?this.score(b,r,q,null,0):fb(p,e,q),g="";switch(this.tokenize){case "full":if(2<d){for(f=0;f<d;f++)for(var k=d;k>f;k--){g=r.substring(f,k);var h=this.score?this.score(b,r,q,g,f):fb(p,e,q,d,f);gb(this,m,g,h,a,c)}break}case "reverse":if(1<
 d){for(k=d-1;0<k;k--)g=r[k]+g,h=this.score?this.score(b,r,q,g,k):fb(p,e,q,d,k),gb(this,m,g,h,a,c);g=""}case "forward":if(1<d){for(k=0;k<d;k++)g+=r[k],gb(this,m,g,f,a,c);break}default:if(gb(this,m,r,f,a,c),n&&1<e&&q<e-1)for(d=B(),g=this.U,f=r,k=Math.min(n+1,e-q),d[f]=1,h=1;h<k;h++)if((r=b[this.rtl?e-1-q-h:q+h])&&!d[r]){d[r]=1;const u=this.score?this.score(b,f,q,r,h):fb(g+(e/2>g?0:1),e,q,k-1,h-1),v=this.bidirectional&&r>f;gb(this,l,v?f:r,u,a,c,v?r:f)}}}}this.fastupdate||this.reg.add(a)}else b=""}this.db&&
@@ -81,7 +82,7 @@ t.mount=function(a){this.commit_timer&&(clearTimeout(this.commit_timer),this.com
 t.clear=function(){this.map.clear();this.ctx.clear();this.reg.clear();this.cache&&this.cache.clear();this.db&&(this.commit_timer&&clearTimeout(this.commit_timer),this.commit_timer=null,this.commit_task=[{clear:!0}]);return this};t.append=function(a,b){return this.add(a,b,!0)};t.contain=function(a){return this.db?this.db.has(a):this.reg.has(a)};t.update=function(a,b){const c=this,e=this.remove(a);return e&&e.then?e.then(()=>c.add(a,b)):this.add(a,b)};
 function nb(a){let b=0;if(a.constructor===Array)for(let c=0,e;c<a.length;c++)(e=a[c])&&(b+=e.length);else for(const c of a){const e=c[0],d=nb(c[1]);d?b+=d:a.delete(e)}return b}t.cleanup=function(){if(!this.fastupdate)return this;nb(this.map);this.depth&&nb(this.ctx);return this};t.searchCache=Va;
 t.export=function(a,b,c=0,e=0){let d,f;switch(e){case 0:d="reg";f=xa(this.reg);break;case 1:d="cfg";f=null;break;case 2:d="map";f=ta(this.map,this.reg.size);break;case 3:d="ctx";f=va(this.ctx,this.reg.size);break;default:return}return za.call(this,a,b,d,f,c,e)};
-t.import=function(a,b){if(b)switch("string"===typeof b&&(b=JSON.parse(b)),a=a.split("."),"json"===a[a.length-1]&&a.pop(),a=1<a.length?a[1]:a[0],a){case "reg":this.fastupdate=!1;this.reg=ya(b,this.reg);break;case "map":this.map=ua(b,this.map);break;case "ctx":this.ctx=wa(b,this.ctx)}};
+t.import=function(a,b){if(b)switch("string"===typeof b&&(b=JSON.parse(b)),a=a.split("."),"json"===a[a.length-1]&&a.pop(),3===a.length&&a.shift(),a=1<a.length?a[1]:a[0],a){case "reg":this.fastupdate=!1;this.reg=ya(b,this.reg);break;case "map":this.map=ua(b,this.map);break;case "ctx":this.ctx=wa(b,this.ctx)}};
 t.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 f=d[0],g=d[1],k="";for(let m=0,n;m<g.length;m++){n=g[m]||[""];var h="";for(var l=0;l<n.length;l++)h+=(h?",":"")+("string"===c?'"'+n[l]+'"':n[l]);h="["+h+"]";k+=(k?",":"")+h}k='["'+f+'",['+k+"]]";e+=(e?",":"")+k}e="index.map=new Map(["+e+"]);";d="";for(const m of this.ctx.entries()){f=
 m[0];g=m[1];for(const n of g.entries()){g=n[0];k=n[1];h="";for(let p=0,q;p<k.length;p++){q=k[p]||[""];l="";for(let r=0;r<q.length;r++)l+=(l?",":"")+("string"===c?'"'+q[r]+'"':q[r]);l="["+l+"]";h+=(h?",":"")+l}h='new Map([["'+g+'",['+h+"]]])";h='["'+f+'",'+h+"]";d+=(d?",":"")+h}}d="index.ctx=new Map(["+d+"]);";return a?"function inject(index){"+b+e+d+"}":b+e+d};la(O.prototype);const ob="undefined"!==typeof window&&(window.indexedDB||window.mozIndexedDB||window.webkitIndexedDB||window.msIndexedDB),pb=["map","ctx","tag","reg","cfg"];
 function rb(a,b={}){if(!this)return new rb(a,b);"object"===typeof a&&(b=a,a=a.name);a||console.info("Default storage space was used, because a name was not passed.");this.id="flexsearch"+(a?":"+a.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"");this.field=b.field?b.field.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"";this.type=b.type;this.fastupdate=this.support_tag_search=!1;this.db=null;this.h={}}t=rb.prototype;t.mount=function(a){if(!a.encoder)return a.mount(this);a.db=this;return this.open()};
diff --git a/dist/flexsearch.bundle.module.debug.js b/dist/flexsearch.bundle.module.debug.js
index 9ed75c3..f4e3353 100644
--- a/dist/flexsearch.bundle.module.debug.js
+++ b/dist/flexsearch.bundle.module.debug.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.111 (Bundle/Module/Debug)
+ * FlexSearch.js v0.8.113 (Bundle/Module/Debug)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -271,12 +271,13 @@ function L(a) {
 ;let M, N;
 async function ka(a) {
   a = a.data;
-  const b = a.task, c = a.id;
+  var b = a.task;
+  const c = a.id;
   let e = a.args;
   switch(b) {
     case "init":
       N = a.options || {};
-      (a = a.factory) ? (Function("return " + a)()(self), M = new self.FlexSearch.Index(N), delete self.FlexSearch) : M = new O(N);
+      (b = a.factory) ? (Function("return " + b)()(self), M = new self.FlexSearch.Index(N), delete self.FlexSearch) : M = new O(N);
       postMessage({id:c});
       break;
     default:
@@ -285,15 +286,15 @@ async function ka(a) {
         if (!N.export || "function" !== typeof N.export) {
           throw Error('Either no extern configuration provided for the Worker-Index or no method was defined on the config property "export".');
         }
-        e = [N.export];
+        e[1] ? (e[0] = N.export, e[2] = 0, e[3] = 1) : e = null;
       }
       if ("import" === b) {
         if (!N.import || "function" !== typeof N.import) {
           throw Error('Either no extern configuration provided for the Worker-Index or no method was defined on the config property "import".');
         }
-        await N.import.call(M, M);
+        e[0] && (a = await N.import.call(M, e[0]), M.import(e[0], a));
       } else {
-        d = M[b].apply(M, e), d.then && (d = await d);
+        (d = e && M[b].apply(M, e)) && d.then && (d = await d);
       }
       postMessage("search" === b ? {id:c, msg:d} : {id:c});
   }
@@ -377,13 +378,15 @@ R("remove");
 R("clear");
 R("export");
 R("import");
+la(Q.prototype);
 function R(a) {
-  Q.prototype[a] = Q.prototype[a + "Async"] = async function() {
+  Q.prototype[a] = function() {
     const b = this, c = [].slice.call(arguments);
     var e = c[c.length - 1];
     let d;
-    "function" === typeof e && (d = e, c.splice(c.length - 1, 1));
+    "function" === typeof e && (d = e, c.pop());
     e = new Promise(function(f) {
+      "export" === a && "function" === typeof c[0] && (c[0] = null);
       b.h[++ra] = f;
       b.worker.postMessage({task:a, id:ra, args:c});
     });
@@ -391,7 +394,7 @@ function R(a) {
   };
 }
 function sa(a, b, c) {
-  return b ? "undefined" !== typeof module ? new (require("worker_threads")["Worker"])(__dirname + "/node/node.js") : import("worker_threads").then(function(worker){ return new worker["Worker"](import.meta.dirname + "/node/node.mjs"); }) : a ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + ka.toString()], {type:"text/javascript"}))) : new window.Worker(E(c) ? c : import.meta.url.replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", 
+  return b ? "undefined" !== typeof module ? new (require("worker_threads")["Worker"])(__dirname + "/node/node.js") : import("worker_threads").then(function(worker){ return new worker["Worker"](import.meta.dirname + "/node/node.mjs"); }) : a ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + ka.toString()], {type:"text/javascript"}))) : new window.Worker("string" === typeof c ? c : import.meta.url.replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", 
   "module/worker/worker.js"), {type:"module"});
 }
 ;function ta(a, b = 0) {
@@ -725,6 +728,7 @@ function Ba(a) {
       }
       this.store.set(a, k || b);
     }
+    this.worker && (this.fastupdate || this.reg.add(a));
   }
   return this;
 };
@@ -1707,21 +1711,31 @@ t.export = function(a, b, c = 0, e = 0) {
   return za.call(this, a, b, d, f, c, e);
 };
 t.import = function(a, b) {
+  var c = a.split(".");
+  "json" === c[c.length - 1] && c.pop();
+  const e = 2 < c.length ? c[0] : "";
+  c = 2 < c.length ? c[2] : c[1];
+  if (this.worker && e) {
+    return this.index.get(e).import(a);
+  }
   if (b) {
     "string" === typeof 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);
+    if (e) {
+      return this.index.get(e).import(c, b);
     }
-    switch(a) {
+    switch(c) {
       case "reg":
         this.fastupdate = !1;
         this.reg = ya(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;
+        for (let d = 0, f; d < this.field.length; d++) {
+          f = this.index.get(this.field[d]), f.fastupdate = !1, f.reg = this.reg;
+        }
+        if (this.worker) {
+          b = [];
+          for (const d of this.index.values()) {
+            b.push(d.import(a));
+          }
+          return Promise.all(b);
         }
         break;
       case "tag":
@@ -2142,7 +2156,7 @@ t.export = function(a, b, c = 0, e = 0) {
 };
 t.import = function(a, b) {
   if (b) {
-    switch("string" === typeof b && (b = JSON.parse(b)), a = a.split("."), "json" === a[a.length - 1] && a.pop(), a = 1 < a.length ? a[1] : a[0], a) {
+    switch("string" === typeof b && (b = JSON.parse(b)), a = a.split("."), "json" === a[a.length - 1] && a.pop(), 3 === a.length && a.shift(), a = 1 < a.length ? a[1] : a[0], a) {
       case "reg":
         this.fastupdate = !1;
         this.reg = ya(b, this.reg);
diff --git a/dist/flexsearch.bundle.module.min.js b/dist/flexsearch.bundle.module.min.js
index 50f3715..1eebdc9 100644
--- a/dist/flexsearch.bundle.module.min.js
+++ b/dist/flexsearch.bundle.module.min.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.111 (Bundle/Module)
+ * FlexSearch.js v0.8.113 (Bundle/Module)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -21,12 +21,12 @@ t.addMatcher=function(a,b){if("object"===typeof a)return this.addReplacer(a,b);i
 t.encode=function(a){if(this.cache&&a.length<=this.K)if(this.H){if(this.B.has(a))return this.B.get(a)}else this.H=setTimeout(L,50,this);this.normalize&&("function"===typeof this.normalize?a=this.normalize(a):a=ja?a.normalize("NFKD").replace(ja,"").toLowerCase():a.toLowerCase());this.prepare&&(a=this.prepare(a));this.numeric&&3<a.length&&(a=a.replace(ha,"$1 $2").replace(ia,"$1 $2").replace(fa,"$1 "));const b=!(this.dedupe||this.mapper||this.filter||this.matcher||this.stemmer||this.replacer);let c=
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@@ -81,7 +82,7 @@ t.mount=function(a){this.commit_timer&&(clearTimeout(this.commit_timer),this.com
 t.clear=function(){this.map.clear();this.ctx.clear();this.reg.clear();this.cache&&this.cache.clear();this.db&&(this.commit_timer&&clearTimeout(this.commit_timer),this.commit_timer=null,this.commit_task=[{clear:!0}]);return this};t.append=function(a,b){return this.add(a,b,!0)};t.contain=function(a){return this.db?this.db.has(a):this.reg.has(a)};t.update=function(a,b){const c=this,e=this.remove(a);return e&&e.then?e.then(()=>c.add(a,b)):this.add(a,b)};
 function ob(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=ob(c[1]);d?b+=d:a.delete(e)}return b}t.cleanup=function(){if(!this.fastupdate)return this;ob(this.map);this.depth&&ob(this.ctx);return this};t.searchCache=Va;
 t.export=function(a,b,c=0,e=0){let d,f;switch(e){case 0:d="reg";f=xa(this.reg);break;case 1:d="cfg";f=null;break;case 2:d="map";f=ta(this.map,this.reg.size);break;case 3:d="ctx";f=va(this.ctx,this.reg.size);break;default:return}return za.call(this,a,b,d,f,c,e)};
-t.import=function(a,b){if(b)switch("string"===typeof b&&(b=JSON.parse(b)),a=a.split("."),"json"===a[a.length-1]&&a.pop(),a=1<a.length?a[1]:a[0],a){case "reg":this.fastupdate=!1;this.reg=ya(b,this.reg);break;case "map":this.map=ua(b,this.map);break;case "ctx":this.ctx=wa(b,this.ctx)}};
+t.import=function(a,b){if(b)switch("string"===typeof b&&(b=JSON.parse(b)),a=a.split("."),"json"===a[a.length-1]&&a.pop(),3===a.length&&a.shift(),a=1<a.length?a[1]:a[0],a){case "reg":this.fastupdate=!1;this.reg=ya(b,this.reg);break;case "map":this.map=ua(b,this.map);break;case "ctx":this.ctx=wa(b,this.ctx)}};
 t.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 f=d[0],g=d[1],k="";for(let m=0,n;m<g.length;m++){n=g[m]||[""];var h="";for(var l=0;l<n.length;l++)h+=(h?",":"")+("string"===c?'"'+n[l]+'"':n[l]);h="["+h+"]";k+=(k?",":"")+h}k='["'+f+'",['+k+"]]";e+=(e?",":"")+k}e="index.map=new Map(["+e+"]);";d="";for(const m of this.ctx.entries()){f=
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 function rb(a,b={}){if(!this)return new rb(a,b);"object"===typeof a&&(b=a,a=a.name);a||console.info("Default storage space was used, because a name was not passed.");this.id="flexsearch"+(a?":"+a.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"");this.field=b.field?b.field.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"";this.type=b.type;this.fastupdate=this.support_tag_search=!1;this.db=null;this.h={}}t=rb.prototype;t.mount=function(a){if(!a.encoder)return a.mount(this);a.db=this;return this.open()};
diff --git a/dist/flexsearch.compact.debug.js b/dist/flexsearch.compact.debug.js
index 0fecacd..aba71aa 100644
--- a/dist/flexsearch.compact.debug.js
+++ b/dist/flexsearch.compact.debug.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.111 (Bundle/Debug)
+ * FlexSearch.js v0.8.113 (Bundle/Debug)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -47,14 +47,14 @@ function B(a, c, b) {
 function C() {
   return Object.create(null);
 }
-function E(a) {
+function D(a) {
   return "string" === typeof a;
 }
 function I(a) {
   return "object" === typeof a;
 }
 function J(a, c) {
-  if (E(c)) {
+  if (D(c)) {
     a = a[c];
   } else {
     for (let b = 0; a && b < c.length; b++) {
@@ -262,30 +262,61 @@ function L(a) {
   a.F.clear();
   a.G.clear();
 }
-;function ia(a) {
-  M.call(a, "add");
-  M.call(a, "append");
-  M.call(a, "search");
-  M.call(a, "update");
-  M.call(a, "remove");
+;let M, N;
+async function ia(a) {
+  a = a.data;
+  var c = a.task;
+  const b = a.id;
+  let e = a.args;
+  switch(c) {
+    case "init":
+      N = a.options || {};
+      (c = a.factory) ? (Function("return " + c)()(self), M = new self.FlexSearch.Index(N), delete self.FlexSearch) : M = new O(N);
+      postMessage({id:b});
+      break;
+    default:
+      let d;
+      if ("export" === c) {
+        if (!N.export || "function" !== typeof N.export) {
+          throw Error('Either no extern configuration provided for the Worker-Index or no method was defined on the config property "export".');
+        }
+        e[1] ? (e[0] = N.export, e[2] = 0, e[3] = 1) : e = null;
+      }
+      if ("import" === c) {
+        if (!N.import || "function" !== typeof N.import) {
+          throw Error('Either no extern configuration provided for the Worker-Index or no method was defined on the config property "import".');
+        }
+        e[0] && (a = await N.import.call(M, e[0]), M.import(e[0], a));
+      } else {
+        (d = e && M[c].apply(M, e)) && d.then && (d = await d);
+      }
+      postMessage("search" === c ? {id:b, msg:d} : {id:b});
+  }
 }
-let N, ja;
-const O = {}, P = {};
-function ka(a) {
-  N = 0;
-  O[a] = P[a];
+;function ja(a) {
+  P.call(a, "add");
+  P.call(a, "append");
+  P.call(a, "search");
+  P.call(a, "update");
+  P.call(a, "remove");
 }
-function M(a) {
+let Q, ka;
+const R = {}, S = {};
+function la(a) {
+  Q = 0;
+  R[a] = S[a];
+}
+function P(a) {
   this[a + "Async"] = function() {
     const c = arguments;
     var b = c[c.length - 1];
     let e;
     "function" === typeof b && (e = b, delete c[c.length - 1]);
-    N || (N = setTimeout(ka, 0, a), ja = Date.now());
-    P[a] || (P[a] = O[a] = 1000);
-    if (!--O[a]) {
-      O[a] = P[a] = P[a] * this.priority * this.priority * 3 / (Date.now() - ja) | 0 || 1;
-      N = clearTimeout(N);
+    Q || (Q = setTimeout(la, 0, a), ka = Date.now());
+    S[a] || (S[a] = R[a] = 1000);
+    if (!--R[a]) {
+      R[a] = S[a] = S[a] * this.priority * this.priority * 3 / (Date.now() - ka) | 0 || 1;
+      Q = clearTimeout(Q);
       const f = this;
       return new Promise(g => {
         setTimeout(function() {
@@ -299,7 +330,68 @@ function M(a) {
     return b;
   };
 }
-;function la(a, c = 0) {
+;let T = 0;
+function ma(a = {}) {
+  function c(g) {
+    function k(h) {
+      h = h.data || h;
+      const l = h.id, m = l && d.h[l];
+      m && (m(h.msg), delete d.h[l]);
+    }
+    this.worker = g;
+    this.h = C();
+    if (this.worker) {
+      e ? this.worker.on("message", k) : this.worker.onmessage = k;
+      if (a.config) {
+        return new Promise(function(h) {
+          d.h[++T] = function() {
+            h(d);
+          };
+          d.worker.postMessage({id:T, task:"init", factory:b, options:a});
+        });
+      }
+      this.worker.postMessage({task:"init", factory:b, options:a});
+      return this;
+    }
+  }
+  if (!this || this.constructor !== ma) {
+    return new ma(a);
+  }
+  let b = "undefined" !== typeof self ? self._factory : "undefined" !== typeof window ? window._factory : null;
+  b && (b = b.toString());
+  const e = "undefined" === typeof window, d = this, f = na(b, e, a.worker);
+  return f.then ? f.then(function(g) {
+    return c.call(d, g);
+  }) : c.call(this, f);
+}
+U("add");
+U("append");
+U("search");
+U("update");
+U("remove");
+U("clear");
+U("export");
+U("import");
+ja(ma.prototype);
+function U(a) {
+  ma.prototype[a] = function() {
+    const c = this, b = [].slice.call(arguments);
+    var e = b[b.length - 1];
+    let d;
+    "function" === typeof e && (d = e, b.pop());
+    e = new Promise(function(f) {
+      "export" === a && "function" === typeof b[0] && (b[0] = null);
+      c.h[++T] = f;
+      c.worker.postMessage({task:a, id:T, args:b});
+    });
+    return d ? (e.then(d), this) : e;
+  };
+}
+function na(a, c, b) {
+  return c ? "undefined" !== typeof module ? new (require("worker_threads")["Worker"])(__dirname + "/node/node.js") : import("worker_threads").then(function(worker){ return new worker["Worker"]((1,eval)("import.meta.dirname") + "/node/node.mjs"); }) : a ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + ia.toString()], {type:"text/javascript"}))) : new window.Worker("string" === typeof b ? b : (0,eval)("import.meta.url").replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", 
+  "module/worker/worker.js"), {type:"module"});
+}
+;function oa(a, c = 0) {
   let b = [], e = [];
   c && (c = 250000 / c * 5000 | 0);
   for (const d of a.entries()) {
@@ -308,30 +400,30 @@ function M(a) {
   e.length && b.push(e);
   return b;
 }
-function ma(a, c) {
+function pa(a, c) {
   c || (c = new Map());
   for (let b = 0, e; b < a.length; b++) {
     e = a[b], c.set(e[0], e[1]);
   }
   return c;
 }
-function na(a, c = 0) {
+function qa(a, c = 0) {
   let b = [], e = [];
   c && (c = 250000 / c * 1000 | 0);
   for (const d of a.entries()) {
-    e.push([d[0], la(d[1])[0]]), e.length === c && (b.push(e), e = []);
+    e.push([d[0], oa(d[1])[0]]), e.length === c && (b.push(e), e = []);
   }
   e.length && b.push(e);
   return b;
 }
-function oa(a, c) {
+function ra(a, c) {
   c || (c = new Map());
   for (let b = 0, e, d; b < a.length; b++) {
-    e = a[b], d = c.get(e[0]), c.set(e[0], ma(e[1], d));
+    e = a[b], d = c.get(e[0]), c.set(e[0], pa(e[1], d));
   }
   return c;
 }
-function pa(a) {
+function sa(a) {
   let c = [], b = [];
   for (const e of a.keys()) {
     b.push(e), 250000 === b.length && (c.push(b), b = []);
@@ -339,14 +431,14 @@ function pa(a) {
   b.length && c.push(b);
   return c;
 }
-function qa(a, c) {
+function ta(a, c) {
   c || (c = new Set());
   for (let b = 0; b < a.length; b++) {
     c.add(a[b]);
   }
   return c;
 }
-function Q(a, c, b, e, d, f, g = 0) {
+function ua(a, c, b, e, d, f, g = 0) {
   const k = e && e.constructor === Array;
   var h = k ? e.shift() : e;
   if (!h) {
@@ -355,12 +447,12 @@ function Q(a, c, b, e, d, f, g = 0) {
   if ((h = a((c ? c + "." : "") + (g + 1) + "." + b, JSON.stringify(h))) && h.then) {
     const l = this;
     return h.then(function() {
-      return Q.call(l, a, c, b, k ? e : null, d, f, g + 1);
+      return ua.call(l, a, c, b, k ? e : null, d, f, g + 1);
     });
   }
-  return Q.call(this, a, c, b, k ? e : null, d, f, g + 1);
+  return ua.call(this, a, c, b, k ? e : null, d, f, g + 1);
 }
-;R.prototype.add = function(a, c, b) {
+;V.prototype.add = function(a, c, b) {
   I(a) && (c = a, a = J(c, this.key));
   if (c && (a || 0 === a)) {
     if (!b && this.reg.has(a)) {
@@ -374,7 +466,7 @@ function Q(a, c, b, e, d, f, g = 0) {
         d && e.add(a, d, !1, !0);
       } else {
         if (d = h.I, !d || d(c)) {
-          h.constructor === String ? h = ["" + h] : E(h) && (h = [h]), ra(c, h, this.J, 0, e, a, h[0], b);
+          h.constructor === String ? h = ["" + h] : D(h) && (h = [h]), va(c, h, this.J, 0, e, a, h[0], b);
         }
       }
     }
@@ -396,7 +488,7 @@ function Q(a, c, b, e, d, f, g = 0) {
           f = J(c, f);
         }
         if (d && f) {
-          E(f) && (f = [f]);
+          D(f) && (f = [f]);
           for (let h = 0, l, m; h < f.length; h++) {
             l = f[h], k[l] || (k[l] = 1, (g = d.get(l)) ? m = g : d.set(l, m = []), b && m.includes(a) || (m.push(a), this.fastupdate && ((g = this.reg.get(a)) ? g.push(m) : this.reg.set(a, [m]))));
           }
@@ -421,11 +513,11 @@ function Q(a, c, b, e, d, f, g = 0) {
               continue;
             }
             l = [l.U];
-          } else if (E(l) || l.constructor === String) {
+          } else if (D(l) || l.constructor === String) {
             k[l] = c[l];
             continue;
           }
-          sa(c, k, l, 0, l[0], m);
+          wa(c, k, l, 0, l[0], m);
         }
       }
       this.store.set(a, k || c);
@@ -433,21 +525,21 @@ function Q(a, c, b, e, d, f, g = 0) {
   }
   return this;
 };
-function sa(a, c, b, e, d, f) {
+function wa(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++) {
-        sa(a, c, b, e, d);
+        wa(a, c, b, e, d);
       }
     } else {
-      c = c[d] || (c[d] = C()), d = b[++e], sa(a, c, b, e, d);
+      c = c[d] || (c[d] = C()), d = b[++e], wa(a, c, b, e, d);
     }
   }
 }
-function ra(a, c, b, e, d, f, g, k) {
+function va(a, c, b, e, d, f, g, k) {
   if (a = a[g]) {
     if (e === c.length - 1) {
       if (a.constructor === Array) {
@@ -463,15 +555,15 @@ function ra(a, c, b, e, d, f, g, k) {
     } else {
       if (a.constructor === Array) {
         for (g = 0; g < a.length; g++) {
-          ra(a, c, b, e, d, f, g, k);
+          va(a, c, b, e, d, f, g, k);
         }
       } else {
-        g = c[++e], ra(a, c, b, e, d, f, g, k);
+        g = c[++e], va(a, c, b, e, d, f, g, k);
       }
     }
   }
 }
-;function ta(a, c, b, e, d) {
+;function xa(a, c, b, e, d) {
   const f = a.length;
   let g = [], k, h;
   k = C();
@@ -486,7 +578,7 @@ function ra(a, c, b, e, d, f, g, k) {
   }
   if (a = g.length) {
     if (d) {
-      g = 1 < g.length ? ua(g, b, e) : (g = g[0]).length > b || e ? g.slice(e, b + e) : g;
+      g = 1 < g.length ? ya(g, b, e) : (g = g[0]).length > b || e ? g.slice(e, b + e) : g;
     } else {
       if (a < f) {
         return [];
@@ -501,7 +593,7 @@ function ra(a, c, b, e, d, f, g, k) {
   }
   return g;
 }
-function ua(a, c, b) {
+function ya(a, c, b) {
   const e = [], d = C();
   let f;
   var g = a.length;
@@ -523,7 +615,7 @@ function ua(a, c, b) {
   }
   return e;
 }
-function va(a, c) {
+function za(a, c) {
   const b = C(), e = [];
   for (let d = 0, f; d < c.length; d++) {
     f = c[d];
@@ -536,12 +628,12 @@ function va(a, c) {
   }
   return e;
 }
-;function S(a, c, b, e) {
+;function Aa(a, c, b, e) {
   if (!a.length) {
     return a;
   }
   if (1 === a.length) {
-    return a = a[0], a = b || a.length > c ? c ? a.slice(b, b + c) : a.slice(b) : a, e ? T.call(this, a) : a;
+    return a = a[0], a = b || a.length > c ? c ? a.slice(b, b + c) : a.slice(b) : a, e ? W.call(this, a) : a;
   }
   let d = [];
   for (let f = 0, g, k; f < a.length; f++) {
@@ -555,7 +647,7 @@ function va(a, c) {
       }
       k > c && (g = g.slice(0, c), k = c);
       if (!d.length && k >= c) {
-        return e ? T.call(this, g) : g;
+        return e ? W.call(this, g) : g;
       }
       d.push(g);
       c -= k;
@@ -565,9 +657,9 @@ function va(a, c) {
     }
   }
   d = 1 < d.length ? [].concat.apply([], d) : d[0];
-  return e ? T.call(this, d) : d;
+  return e ? W.call(this, d) : d;
 }
-;function U(a, c, b) {
+;function Ba(a, c, b) {
   var e = b[0];
   if (e.then) {
     return Promise.all(b).then(function(m) {
@@ -582,7 +674,7 @@ function va(a, c) {
   for (let m = 0, n; m < b.length; m++) {
     if (n = b[m]) {
       let t;
-      if (n.constructor === V) {
+      if (n.constructor === X) {
         t = n.result;
       } else if (n.constructor === Array) {
         t = n;
@@ -613,11 +705,11 @@ function va(a, c) {
   }
   return {O:e, P:d, limit:f, offset:g, enrich:k, resolve:h, suggest:l};
 }
-;V.prototype.or = function() {
-  const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f} = U(this, "or", arguments);
-  return wa.call(this, a, c, b, e, d, f);
+;X.prototype.or = function() {
+  const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f} = Ba(this, "or", arguments);
+  return Ca.call(this, a, c, b, e, d, f);
 };
-function wa(a, c, b, e, d, f) {
+function Ca(a, c, b, e, d, f) {
   if (c.length) {
     const g = this;
     return Promise.all(c).then(function(k) {
@@ -625,25 +717,25 @@ function wa(a, c, b, e, d, f) {
       for (let h = 0, l; h < k.length; h++) {
         (l = k[h]).length && (a[h] = l);
       }
-      return wa.call(g, a, [], b, e, d, f);
+      return Ca.call(g, a, [], b, e, d, f);
     });
   }
-  a.length && (this.result.length && a.push(this.result), 2 > a.length ? this.result = a[0] : (this.result = ua(a, b, e), e = 0));
+  a.length && (this.result.length && a.push(this.result), 2 > a.length ? this.result = a[0] : (this.result = ya(a, b, e), e = 0));
   return f ? this.resolve(b, e, d) : this;
 }
-;V.prototype.and = function() {
+;X.prototype.and = function() {
   let a = this.result.length, c, b, e, d;
   if (!a) {
     const f = arguments[0];
     f && (a = !!f.suggest, d = f.resolve, c = f.limit, b = f.offset, e = f.enrich && d);
   }
   if (a) {
-    const {O:f, P:g, limit:k, offset:h, enrich:l, resolve:m, suggest:n} = U(this, "and", arguments);
-    return xa.call(this, f, g, k, h, l, m, n);
+    const {O:f, P:g, limit:k, offset:h, enrich:l, resolve:m, suggest:n} = Ba(this, "and", arguments);
+    return Da.call(this, f, g, k, h, l, m, n);
   }
   return d ? this.resolve(c, b, e) : this;
 };
-function xa(a, c, b, e, d, f, g) {
+function Da(a, c, b, e, d, f, g) {
   if (c.length) {
     const k = this;
     return Promise.all(c).then(function(h) {
@@ -651,7 +743,7 @@ function xa(a, c, b, e, d, f, g) {
       for (let l = 0, m; l < h.length; l++) {
         (m = h[l]).length && (a[l] = m);
       }
-      return xa.call(k, a, [], b, e, d, f, g);
+      return Da.call(k, a, [], b, e, d, f, g);
     });
   }
   if (a.length) {
@@ -659,7 +751,7 @@ function xa(a, c, b, e, d, f, g) {
       this.result = a[0];
     } else {
       if (c = aa(a)) {
-        return this.result = ta(a, c, b, e, g), f ? d ? T.call(this.index, this.result) : this.result : this;
+        return this.result = xa(a, c, b, e, g), f ? d ? W.call(this.index, this.result) : this.result : this;
       }
       this.result = [];
     }
@@ -668,11 +760,11 @@ function xa(a, c, b, e, d, f, g) {
   }
   return f ? this.resolve(b, e, d) : this;
 }
-;V.prototype.xor = function() {
-  const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f, suggest:g} = U(this, "xor", arguments);
-  return ya.call(this, a, c, b, e, d, f, g);
+;X.prototype.xor = function() {
+  const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f, suggest:g} = Ba(this, "xor", arguments);
+  return Ea.call(this, a, c, b, e, d, f, g);
 };
-function ya(a, c, b, e, d, f, g) {
+function Ea(a, c, b, e, d, f, g) {
   if (c.length) {
     const k = this;
     return Promise.all(c).then(function(h) {
@@ -680,21 +772,21 @@ function ya(a, c, b, e, d, f, g) {
       for (let l = 0, m; l < h.length; l++) {
         (m = h[l]).length && (a[l] = m);
       }
-      return ya.call(k, a, [], b, e, d, f, g);
+      return Ea.call(k, a, [], b, e, d, f, g);
     });
   }
   if (a.length) {
     if (this.result.length && a.unshift(this.result), 2 > a.length) {
       this.result = a[0];
     } else {
-      return this.result = za.call(this, a, b, e, f, this.h), f ? d ? T.call(this.index, this.result) : this.result : this;
+      return this.result = Fa.call(this, a, b, e, f, this.h), f ? d ? W.call(this.index, this.result) : this.result : this;
     }
   } else {
     g || (this.result = a);
   }
   return f ? this.resolve(b, e, d) : this;
 }
-function za(a, c, b, e, d) {
+function Fa(a, c, b, e, d) {
   const f = [], g = C();
   let k = 0;
   for (let h = 0, l; h < a.length; h++) {
@@ -739,11 +831,11 @@ function za(a, c, b, e, d) {
   }
   return f;
 }
-;V.prototype.not = function() {
-  const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f, suggest:g} = U(this, "not", arguments);
-  return Aa.call(this, a, c, b, e, d, f, g);
+;X.prototype.not = function() {
+  const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f, suggest:g} = Ba(this, "not", arguments);
+  return Ga.call(this, a, c, b, e, d, f, g);
 };
-function Aa(a, c, b, e, d, f, g) {
+function Ga(a, c, b, e, d, f, g) {
   if (c.length) {
     const k = this;
     return Promise.all(c).then(function(h) {
@@ -751,17 +843,17 @@ function Aa(a, c, b, e, d, f, g) {
       for (let l = 0, m; l < h.length; l++) {
         (m = h[l]).length && (a[l] = m);
       }
-      return Aa.call(k, a, [], b, e, d, f, g);
+      return Ga.call(k, a, [], b, e, d, f, g);
     });
   }
   if (a.length && this.result.length) {
-    this.result = Ba.call(this, a, b, e, f);
+    this.result = Ha.call(this, a, b, e, f);
   } else if (f) {
     return this.resolve(b, e, d);
   }
-  return f ? d ? T.call(this.index, this.result) : this.result : this;
+  return f ? d ? W.call(this.index, this.result) : this.result : this;
 }
-function Ba(a, c, b, e) {
+function Ha(a, c, b, e) {
   const d = [];
   a = new Set(a.flat().flat());
   for (let f = 0, g, k = 0; f < this.result.length; f++) {
@@ -787,9 +879,9 @@ function Ba(a, c, b, e) {
   }
   return d;
 }
-;function V(a) {
-  if (!this || this.constructor !== V) {
-    return new V(a);
+;function X(a) {
+  if (!this || this.constructor !== X) {
+    return new X(a);
   }
   if (a && a.index) {
     return a.resolve = !1, this.index = a.index, this.h = a.boost || 0, this.result = a.index.search(a).result, this;
@@ -798,7 +890,7 @@ function Ba(a, c, b, e) {
   this.result = a || [];
   this.h = 0;
 }
-V.prototype.limit = function(a) {
+X.prototype.limit = function(a) {
   if (this.result.length) {
     const c = [];
     for (let b = 0, e; b < this.result.length; b++) {
@@ -817,7 +909,7 @@ V.prototype.limit = function(a) {
   }
   return this;
 };
-V.prototype.offset = function(a) {
+X.prototype.offset = function(a) {
   if (this.result.length) {
     const c = [];
     for (let b = 0, e; b < this.result.length; b++) {
@@ -829,17 +921,17 @@ V.prototype.offset = function(a) {
   }
   return this;
 };
-V.prototype.boost = function(a) {
+X.prototype.boost = function(a) {
   this.h += a;
   return this;
 };
-V.prototype.resolve = function(a, c, b) {
+X.prototype.resolve = function(a, c, b) {
   const e = this.result, d = this.index;
   this.result = this.index = null;
-  return e.length ? ("object" === typeof a && (b = a.enrich, c = a.offset, a = a.limit), S.call(d, e, a || 100, c, b)) : e;
+  return e.length ? ("object" === typeof a && (b = a.enrich, c = a.offset, a = a.limit), Aa.call(d, e, a || 100, c, b)) : e;
 };
 C();
-R.prototype.search = function(a, c, b, e) {
+V.prototype.search = function(a, c, b, e) {
   b || (!c && I(a) ? (b = a, a = "") : I(c) && (b = c, c = 0));
   let d = [];
   var f = [];
@@ -864,7 +956,7 @@ R.prototype.search = function(a, c, b, e) {
       var u = [];
       for (let x = 0, r; x < m.length; x++) {
         r = m[x];
-        if (E(r)) {
+        if (D(r)) {
           throw Error("A tag option can't be a string, instead it needs a { field: tag } format.");
         }
         if (r.field && r.tag) {
@@ -878,8 +970,8 @@ R.prototype.search = function(a, c, b, e) {
           }
         } else {
           v = Object.keys(r);
-          for (let D = 0, F, A; D < v.length; D++) {
-            if (F = v[D], A = r[F], A.constructor === Array) {
+          for (let E = 0, F, A; E < v.length; E++) {
+            if (F = v[E], A = r[F], A.constructor === Array) {
               for (z = 0; z < A.length; z++) {
                 u.push(F, A[z]);
               }
@@ -897,7 +989,7 @@ R.prototype.search = function(a, c, b, e) {
         e = [];
         if (u.length) {
           for (f = 0; f < u.length; f += 2) {
-            y = Ca.call(this, u[f], u[f + 1], c, n, g), d.push({field:u[f], tag:u[f + 1], result:y});
+            y = Ia.call(this, u[f], u[f + 1], c, n, g), d.push({field:u[f], tag:u[f + 1], result:y});
           }
         }
         return e.length ? Promise.all(e).then(function(x) {
@@ -912,14 +1004,14 @@ R.prototype.search = function(a, c, b, e) {
   }
   l || (l = this.field);
   u = !e && (this.worker || this.db) && [];
-  for (let x = 0, r, D, F; x < l.length; x++) {
-    D = l[x];
+  for (let x = 0, r, E, F; x < l.length; x++) {
+    E = l[x];
     let A;
-    E(D) || (A = D, D = A.field, a = A.query || a, c = A.limit || c, n = A.offset || n, h = A.suggest || h, g = this.store && (A.enrich || g));
+    D(E) || (A = E, E = A.field, a = A.query || a, c = A.limit || c, n = A.offset || n, h = A.suggest || h, g = this.store && (A.enrich || g));
     if (e) {
       r = e[x];
     } else {
-      if (v = A || b, z = this.index.get(D), m && (v.enrich = !1), u) {
+      if (v = A || b, z = this.index.get(E), m && (v.enrich = !1), u) {
         u[x] = z.search(a, c, v);
         v && g && (v.enrich = g);
         continue;
@@ -931,34 +1023,34 @@ R.prototype.search = function(a, c, b, e) {
     if (m && F) {
       v = [];
       z = 0;
-      for (let G = 0, H, Sa; G < m.length; G += 2) {
+      for (let G = 0, H, Za; G < m.length; G += 2) {
         H = this.tag.get(m[G]);
         if (!H) {
           if (console.warn("Tag '" + m[G] + ":" + m[G + 1] + "' will be skipped because there is no field '" + m[G] + "'."), h) {
             continue;
           } else {
-            return p ? d : new V(d);
+            return p ? d : new X(d);
           }
         }
-        if (Sa = (H = H && H.get(m[G + 1])) && H.length) {
+        if (Za = (H = H && H.get(m[G + 1])) && H.length) {
           z++, v.push(H);
         } else if (!h) {
-          return p ? d : new V(d);
+          return p ? d : new X(d);
         }
       }
       if (z) {
-        r = va(r, v);
+        r = za(r, v);
         F = r.length;
         if (!F && !h) {
-          return p ? r : new V(r);
+          return p ? r : new X(r);
         }
         z--;
       }
     }
     if (F) {
-      f[t] = D, d.push(r), t++;
+      f[t] = E, d.push(r), t++;
     } else if (1 === l.length) {
-      return p ? d : new V(d);
+      return p ? d : new X(d);
     }
   }
   if (u) {
@@ -968,7 +1060,7 @@ R.prototype.search = function(a, c, b, e) {
     });
   }
   if (!t) {
-    return p ? d : new V(d);
+    return p ? d : new X(d);
   }
   if (y && (!g || !this.store)) {
     return d[0];
@@ -976,15 +1068,15 @@ R.prototype.search = function(a, c, b, e) {
   u = [];
   for (let x = 0, r; x < f.length; x++) {
     r = d[x];
-    g && r.length && !r[0].doc && (r = T.call(this, r));
+    g && r.length && !r[0].doc && (r = W.call(this, r));
     if (y) {
-      return p ? r : new V(r);
+      return p ? r : new X(r);
     }
     d[x] = {field:f[x], result:r};
   }
-  return k ? Da(d, c) : q ? Ea(d, a, this.index, this.field, this.C, q) : d;
+  return k ? Ja(d, c) : q ? Ka(d, a, this.index, this.field, this.C, q) : d;
 };
-function Ea(a, c, b, e, d, f) {
+function Ka(a, c, b, e, d, f) {
   let g, k, h;
   for (let m = 0, n, t, p, q, y; m < a.length; m++) {
     n = a[m].result;
@@ -999,21 +1091,21 @@ function Ea(a, c, b, e, d, f) {
       var l = J(n[u].doc, y);
       let z = g.encode(l);
       l = l.split(g.split);
-      for (let x = 0, r, D; x < z.length; x++) {
+      for (let x = 0, r, E; x < z.length; x++) {
         r = z[x];
-        D = l[x];
+        E = l[x];
         let F;
         for (let A = 0, G; A < k.length; A++) {
           if (G = k[A], "strict" === h) {
             if (r === G) {
-              v += (v ? " " : "") + f.replace("$1", D);
+              v += (v ? " " : "") + f.replace("$1", E);
               F = !0;
               break;
             }
           } else {
             const H = r.indexOf(G);
             if (-1 < H) {
-              v += (v ? " " : "") + D.substring(0, H) + f.replace("$1", D.substring(H, G.length)) + D.substring(H + G.length);
+              v += (v ? " " : "") + E.substring(0, H) + f.replace("$1", E.substring(H, G.length)) + E.substring(H + G.length);
               F = !0;
               break;
             }
@@ -1026,7 +1118,7 @@ function Ea(a, c, b, e, d, f) {
   }
   return a;
 }
-function Da(a, c) {
+function Ja(a, c) {
   const b = [], e = C();
   for (let d = 0, f, g; d < a.length; d++) {
     f = a[d];
@@ -1045,7 +1137,7 @@ function Da(a, c) {
   }
   return b;
 }
-function Ca(a, c, b, e, d) {
+function Ia(a, c, b, e, d) {
   let f = this.tag.get(a);
   if (!f) {
     return console.warn("Tag '" + a + "' was not found"), [];
@@ -1054,11 +1146,11 @@ function Ca(a, c, b, e, d) {
     if (a > b || e) {
       f = f.slice(e, e + b);
     }
-    d && (f = T.call(this, f));
+    d && (f = W.call(this, f));
     return f;
   }
 }
-function T(a) {
+function W(a) {
   if (!this || !this.store) {
     return a;
   }
@@ -1068,32 +1160,32 @@ function T(a) {
   }
   return c;
 }
-;function R(a) {
-  if (!this || this.constructor !== R) {
-    return new R(a);
+;function V(a) {
+  if (!this || this.constructor !== V) {
+    return new V(a);
   }
   const c = a.document || a.doc || a;
   var b;
   this.C = [];
   this.field = [];
   this.J = [];
-  this.key = (b = c.key || c.id) && W(b, this.J) || "id";
+  this.key = (b = c.key || c.id) && La(b, this.J) || "id";
   this.reg = (this.fastupdate = !!a.fastupdate) ? new Map() : new Set();
   this.A = (b = c.store || null) && b && !0 !== b && [];
   this.store = b && new Map();
-  this.cache = (b = a.cache || null) && new X(b);
+  this.cache = (b = a.cache || null) && new Y(b);
   a.cache = !1;
   b = new Map();
   let e = c.index || c.field || c;
-  E(e) && (e = [e]);
+  D(e) && (e = [e]);
   for (let d = 0, f, g; d < e.length; d++) {
-    f = e[d], E(f) || (g = f, f = f.field), g = I(g) ? Object.assign({}, a, g) : a, b.set(f, new Y(g, this.reg)), g.custom ? this.C[d] = g.custom : (this.C[d] = W(f, this.J), g.filter && ("string" === typeof this.C[d] && (this.C[d] = new String(this.C[d])), this.C[d].I = g.filter)), this.field[d] = f;
+    f = e[d], D(f) || (g = f, f = f.field), g = I(g) ? Object.assign({}, a, g) : a, b.set(f, new O(g, this.reg)), g.custom ? this.C[d] = g.custom : (this.C[d] = La(f, this.J), g.filter && ("string" === typeof this.C[d] && (this.C[d] = new String(this.C[d])), this.C[d].I = g.filter)), this.field[d] = f;
   }
   if (this.A) {
     a = c.store;
-    E(a) && (a = [a]);
+    D(a) && (a = [a]);
     for (let d = 0, f, g; d < a.length; d++) {
-      f = a[d], g = f.field || f, f.custom ? (this.A[d] = f.custom, f.custom.U = g) : (this.A[d] = W(g, this.J), f.filter && ("string" === typeof this.A[d] && (this.A[d] = new String(this.A[d])), this.A[d].I = f.filter));
+      f = a[d], g = f.field || f, f.custom ? (this.A[d] = f.custom, f.custom.U = g) : (this.A[d] = La(g, this.J), f.filter && ("string" === typeof this.A[d] && (this.A[d] = new String(this.A[d])), this.A[d].I = f.filter));
     }
   }
   this.index = b;
@@ -1109,14 +1201,14 @@ function T(a) {
         if (!g) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
-        f.custom ? this.B[d] = f.custom : (this.B[d] = W(g, this.J), f.filter && ("string" === typeof this.B[d] && (this.B[d] = new String(this.B[d])), this.B[d].I = f.filter));
+        f.custom ? this.B[d] = f.custom : (this.B[d] = La(g, this.J), f.filter && ("string" === typeof this.B[d] && (this.B[d] = new String(this.B[d])), this.B[d].I = f.filter));
         this.T[d] = g;
         this.tag.set(g, new Map());
       }
     }
   }
 }
-function W(a, c) {
+function La(a, c) {
   const b = a.split(":");
   let e = 0;
   for (let d = 0; d < b.length; d++) {
@@ -1125,7 +1217,7 @@ function W(a, c) {
   e < b.length && (b.length = e);
   return 1 < e ? b : b[0];
 }
-w = R.prototype;
+w = V.prototype;
 w.append = function(a, c) {
   return this.add(a, c, !0);
 };
@@ -1181,7 +1273,7 @@ w.set = function(a, c) {
   this.store.set(a, c);
   return this;
 };
-w.searchCache = Fa;
+w.searchCache = Ma;
 w.export = function(a, c, b = 0, e = 0) {
   if (b < this.field.length) {
     const g = this.field[b];
@@ -1197,17 +1289,17 @@ w.export = function(a, c, b = 0, e = 0) {
   switch(e) {
     case 0:
       d = "reg";
-      f = pa(this.reg);
+      f = sa(this.reg);
       c = null;
       break;
     case 1:
       d = "tag";
-      f = na(this.tag, this.reg.size);
+      f = qa(this.tag, this.reg.size);
       c = null;
       break;
     case 2:
       d = "doc";
-      f = la(this.store);
+      f = oa(this.store);
       c = null;
       break;
     case 3:
@@ -1217,38 +1309,38 @@ w.export = function(a, c, b = 0, e = 0) {
     default:
       return;
   }
-  return Q.call(this, a, c, d, f, b, e);
+  return ua.call(this, a, c, d, f, b, e);
 };
 w.import = function(a, c) {
+  var b = a.split(".");
+  "json" === b[b.length - 1] && b.pop();
+  a = 2 < b.length ? b[0] : "";
+  b = 2 < b.length ? b[2] : b[1];
   if (c) {
     "string" === typeof c && (c = JSON.parse(c));
-    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);
+    if (a) {
+      return this.index.get(a).import(b, c);
     }
-    switch(a) {
+    switch(b) {
       case "reg":
         this.fastupdate = !1;
-        this.reg = qa(c, this.reg);
+        this.reg = ta(c, this.reg);
         for (let e = 0, d; e < this.field.length; e++) {
           d = this.index.get(this.field[e]), d.fastupdate = !1, d.reg = this.reg;
         }
         break;
       case "tag":
-        this.tag = oa(c, this.tag);
+        this.tag = ra(c, this.tag);
         break;
       case "doc":
-        this.store = ma(c, this.store);
+        this.store = pa(c, this.store);
     }
   }
 };
-ia(R.prototype);
-function Fa(a, c, b) {
+ja(V.prototype);
+function Ma(a, c, b) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
-  this.cache || (this.cache = new X());
+  this.cache || (this.cache = new Y());
   let e = this.cache.get(a);
   if (!e) {
     e = this.search(a, c, b);
@@ -1263,56 +1355,56 @@ function Fa(a, c, b) {
   }
   return e;
 }
-function X(a) {
+function Y(a) {
   this.limit = a && !0 !== a ? a : 1000;
   this.cache = new Map();
   this.h = "";
 }
-X.prototype.set = function(a, c) {
+Y.prototype.set = function(a, c) {
   this.cache.set(this.h = a, c);
   this.cache.size > this.limit && this.cache.delete(this.cache.keys().next().value);
 };
-X.prototype.get = function(a) {
+Y.prototype.get = function(a) {
   const c = this.cache.get(a);
   c && this.h !== a && (this.cache.delete(a), this.cache.set(this.h = a, c));
   return c;
 };
-X.prototype.remove = function(a) {
+Y.prototype.remove = function(a) {
   for (const c of this.cache) {
     const b = c[0];
     c[1].includes(a) && this.cache.delete(b);
   }
 };
-X.prototype.clear = function() {
+Y.prototype.clear = function() {
   this.cache.clear();
   this.h = "";
 };
-const Ga = {normalize:function(a) {
+const Na = {normalize:function(a) {
   return a.toLowerCase();
 }};
-const Ha = 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 Ia = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), Ja = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
-const Ka = {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 La = /[\x00-\x7F]+/g;
-const Ma = /[\x00-\x7F]+/g;
-const Na = /[\x00-\x7F]+/g;
-var Oa = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:Ga, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:Ha}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:Ha, matcher:Ia, replacer:Ja}, LatinExtra:{normalize:!0, dedupe:!0, mapper:Ha, replacer:Ja.concat([/(?!^)[aeo]/g, ""]), matcher:Ia}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
+const Oa = new Map([["b", "p"], ["v", "f"], ["w", "f"], ["z", "s"], ["x", "s"], ["d", "t"], ["n", "m"], ["c", "k"], ["g", "k"], ["j", "k"], ["q", "k"], ["i", "e"], ["y", "e"], ["u", "o"]]);
+const Pa = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), Qa = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
+const Ra = {a:"", e:"", i:"", o:"", u:"", y:"", b:1, f:1, p:1, v:1, c:2, g:2, j:2, k:2, q:2, s:2, x:2, z:2, "\u00df":2, d:3, t:3, l:4, m:5, n:5, r:6};
+const Sa = /[\x00-\x7F]+/g;
+const Ta = /[\x00-\x7F]+/g;
+const Ua = /[\x00-\x7F]+/g;
+var Va = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:Na, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:Oa}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:Oa, matcher:Pa, replacer:Qa}, LatinExtra:{normalize:!0, dedupe:!0, mapper:Oa, replacer:Qa.concat([/(?!^)[aeo]/g, ""]), matcher:Pa}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
   for (let b = 0; b < a.length; b++) {
     var c = a[b];
-    let e = c.charAt(0), d = Ka[e];
-    for (let f = 1, g; f < c.length && (g = c.charAt(f), "h" === g || "w" === g || !(g = Ka[g]) || g === d || (e += g, d = g, 4 !== e.length)); f++) {
+    let e = c.charAt(0), d = Ra[e];
+    for (let f = 1, g; f < c.length && (g = c.charAt(f), "h" === g || "w" === g || !(g = Ra[g]) || g === d || (e += g, d = g, 4 !== e.length)); f++) {
     }
     a[b] = e;
   }
 }}, ArabicDefault:{rtl:!0, normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(La, " ");
+  return ("" + a).replace(Sa, " ");
 }}, CjkDefault:{normalize:!1, dedupe:!0, split:"", prepare:function(a) {
-  return ("" + a).replace(Ma, "");
+  return ("" + a).replace(Ta, "");
 }}, CyrillicDefault:{normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(Na, " ");
+  return ("" + a).replace(Ua, " ");
 }}};
-const Pa = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
-Y.prototype.add = function(a, c, b, e) {
+const Wa = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
+O.prototype.add = function(a, c, b, e) {
   if (c && (a || 0 === a)) {
     if (!e && !b && this.reg.has(a)) {
       return this.update(a, c);
@@ -1324,14 +1416,14 @@ Y.prototype.add = function(a, c, b, e) {
         let q = c[this.rtl ? e - 1 - p : p];
         var d = q.length;
         if (d && (n || !m[q])) {
-          var f = this.score ? this.score(c, q, p, null, 0) : Qa(t, e, p), g = "";
+          var f = this.score ? this.score(c, q, p, null, 0) : Xa(t, e, p), g = "";
           switch(this.tokenize) {
             case "full":
               if (2 < d) {
                 for (f = 0; f < d; f++) {
                   for (var k = d; k > f; k--) {
                     g = q.substring(f, k);
-                    var h = this.score ? this.score(c, q, p, g, f) : Qa(t, e, p, d, f);
+                    var h = this.score ? this.score(c, q, p, g, f) : Xa(t, e, p, d, f);
                     Z(this, m, g, h, a, b);
                   }
                 }
@@ -1340,7 +1432,7 @@ Y.prototype.add = function(a, c, b, e) {
             case "reverse":
               if (1 < d) {
                 for (k = d - 1; 0 < k; k--) {
-                  g = q[k] + g, h = this.score ? this.score(c, q, p, g, k) : Qa(t, e, p, d, k), Z(this, m, g, h, a, b);
+                  g = q[k] + g, h = this.score ? this.score(c, q, p, g, k) : Xa(t, e, p, d, k), Z(this, m, g, h, a, b);
                 }
                 g = "";
               }
@@ -1356,7 +1448,7 @@ Y.prototype.add = function(a, c, b, e) {
                 for (d = C(), g = this.S, f = q, k = Math.min(n + 1, e - p), d[f] = 1, h = 1; h < k; h++) {
                   if ((q = c[this.rtl ? e - 1 - p - h : p + h]) && !d[q]) {
                     d[q] = 1;
-                    const y = this.score ? this.score(c, f, p, q, h) : Qa(g + (e / 2 > g ? 0 : 1), e, p, k - 1, h - 1), u = this.bidirectional && q > f;
+                    const y = this.score ? this.score(c, f, p, q, h) : Xa(g + (e / 2 > g ? 0 : 1), e, p, k - 1, h - 1), u = this.bidirectional && q > f;
                     Z(this, l, u ? f : q, y, a, b, u ? q : f);
                   }
                 }
@@ -1375,10 +1467,10 @@ function Z(a, c, b, e, d, f, g) {
     g ? (c = h || (c[b] = C()), c[g] = 1, (h = k.get(g)) ? k = h : k.set(g, k = new Map())) : c[b] = 1, (h = k.get(b)) ? k = h : k.set(b, k = []), k = k[e] || (k[e] = []), f && k.includes(d) || (k.push(d), a.fastupdate && ((c = a.reg.get(d)) ? c.push(k) : a.reg.set(d, [k])));
   }
 }
-function Qa(a, c, b, e, d) {
+function Xa(a, c, b, e, d) {
   return b && 1 < a ? c + (e || 0) <= a ? b + (d || 0) : (a - 1) / (c + (e || 0)) * (b + (d || 0)) + 1 | 0 : 0;
 }
-;Y.prototype.search = function(a, c, b) {
+;O.prototype.search = function(a, c, b) {
   b || (!c && I(a) ? (b = a, a = "") : I(c) && (b = c, c = 0));
   var e = [], d = 0;
   if (b) {
@@ -1396,11 +1488,11 @@ function Qa(a, c, b, e, d) {
   b = a.length;
   c = c || (k ? 100 : 0);
   if (1 === b) {
-    return g = c, (c = Ra(this, a[0], "")) && c.length ? S.call(this, c, g, d) : [];
+    return g = c, (c = Ya(this, a[0], "")) && c.length ? Aa.call(this, c, g, d) : [];
   }
   f = this.depth && !1 !== f;
   if (2 === b && f && !g) {
-    return g = c, (c = Ra(this, a[0], a[1])) && c.length ? S.call(this, c, g, d) : [];
+    return g = c, (c = Ya(this, a[0], a[1])) && c.length ? Aa.call(this, c, g, d) : [];
   }
   k = C();
   let l = 0;
@@ -1412,7 +1504,7 @@ function Qa(a, c, b, e, d) {
   for (let q, y; l < b; l++) {
     if ((y = a[l]) && !k[y]) {
       k[y] = 1;
-      q = Ra(this, y, m);
+      q = Ya(this, y, m);
       a: {
         f = q;
         var n = e, t = g, p = h;
@@ -1449,22 +1541,22 @@ function Qa(a, c, b, e, d) {
     e = a.length;
     m = a;
     if (1 < e) {
-      m = ta(a, h, c, d, g);
+      m = xa(a, h, c, d, g);
     } else if (1 === e) {
-      g = S.call(null, a[0], c, d);
+      g = Aa.call(null, a[0], c, d);
       break a;
     }
     g = m;
   }
   return g;
 };
-function Ra(a, c, b) {
+function Ya(a, c, b) {
   let e;
   b && (e = a.bidirectional && c > b) && (e = b, b = c, c = e);
   a = b ? (a = a.ctx.get(b)) && a.get(c) : a.map.get(c);
   return a;
 }
-;Y.prototype.remove = function(a, c) {
+;O.prototype.remove = function(a, c) {
   const b = this.reg.size && (this.fastupdate ? this.reg.get(a) : this.reg.has(a));
   if (b) {
     if (this.fastupdate) {
@@ -1479,14 +1571,14 @@ function Ra(a, c, b) {
         }
       }
     } else {
-      Ta(this.map, a), this.depth && Ta(this.ctx, a);
+      $a(this.map, a), this.depth && $a(this.ctx, a);
     }
     c || this.reg.delete(a);
   }
   this.cache && this.cache.remove(a);
   return this;
 };
-function Ta(a, c) {
+function $a(a, c) {
   let b = 0;
   if (a.constructor === Array) {
     for (let e = 0, d, f; e < a.length; e++) {
@@ -1501,24 +1593,24 @@ function Ta(a, c) {
     }
   } else {
     for (let e of a.entries()) {
-      const d = e[0], f = Ta(e[1], c);
+      const d = e[0], f = $a(e[1], c);
       f ? b += f : a.delete(d);
     }
   }
   return b;
 }
-;function Y(a, c) {
-  if (!this || this.constructor !== Y) {
-    return new Y(a);
+;function O(a, c) {
+  if (!this || this.constructor !== O) {
+    return new O(a);
   }
   if (a) {
-    var b = E(a) ? a : a.preset;
-    b && (Pa[b] || console.warn("Preset not found: " + b), a = Object.assign({}, Pa[b], a));
+    var b = D(a) ? a : a.preset;
+    b && (Wa[b] || console.warn("Preset not found: " + b), a = Object.assign({}, Wa[b], a));
   } else {
     a = {};
   }
   b = a.context;
-  const e = !0 === b ? {depth:1} : b || {}, d = E(a.encoder) ? Oa[a.encoder] : a.encode || a.encoder || Ga;
+  const e = !0 === b ? {depth:1} : b || {}, d = D(a.encoder) ? Va[a.encoder] : a.encode || a.encoder || Na;
   this.encoder = d.encode ? d : "object" === typeof d ? new K(d) : {encode:d};
   this.resolution = a.resolution || 9;
   this.tokenize = (b = a.tokenize) && "default" !== b && b || "strict";
@@ -1532,10 +1624,10 @@ function Ta(a, c) {
   this.reg = c || (this.fastupdate ? new Map() : new Set());
   this.S = e.resolution || 3;
   this.rtl = d.rtl || a.rtl || !1;
-  this.cache = (b = a.cache || null) && new X(b);
+  this.cache = (b = a.cache || null) && new Y(b);
   this.priority = a.priority || 4;
 }
-w = Y.prototype;
+w = O.prototype;
 w.clear = function() {
   this.map.clear();
   this.ctx.clear();
@@ -1553,7 +1645,7 @@ w.update = function(a, c) {
   const b = this, e = this.remove(a);
   return e && e.then ? e.then(() => b.add(a, c)) : this.add(a, c);
 };
-function Ua(a) {
+function ab(a) {
   let c = 0;
   if (a.constructor === Array) {
     for (let b = 0, e; b < a.length; b++) {
@@ -1561,7 +1653,7 @@ function Ua(a) {
     }
   } else {
     for (const b of a) {
-      const e = b[0], d = Ua(b[1]);
+      const e = b[0], d = ab(b[1]);
       d ? c += d : a.delete(e);
     }
   }
@@ -1571,17 +1663,17 @@ w.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
-  Ua(this.map);
-  this.depth && Ua(this.ctx);
+  ab(this.map);
+  this.depth && ab(this.ctx);
   return this;
 };
-w.searchCache = Fa;
+w.searchCache = Ma;
 w.export = function(a, c, b = 0, e = 0) {
   let d, f;
   switch(e) {
     case 0:
       d = "reg";
-      f = pa(this.reg);
+      f = sa(this.reg);
       break;
     case 1:
       d = "cfg";
@@ -1589,29 +1681,29 @@ w.export = function(a, c, b = 0, e = 0) {
       break;
     case 2:
       d = "map";
-      f = la(this.map, this.reg.size);
+      f = oa(this.map, this.reg.size);
       break;
     case 3:
       d = "ctx";
-      f = na(this.ctx, this.reg.size);
+      f = qa(this.ctx, this.reg.size);
       break;
     default:
       return;
   }
-  return Q.call(this, a, c, d, f, b, e);
+  return ua.call(this, a, c, d, f, b, e);
 };
 w.import = function(a, c) {
   if (c) {
-    switch("string" === typeof c && (c = JSON.parse(c)), a = a.split("."), "json" === a[a.length - 1] && a.pop(), a = 1 < a.length ? a[1] : a[0], a) {
+    switch("string" === typeof c && (c = JSON.parse(c)), a = a.split("."), "json" === a[a.length - 1] && a.pop(), 3 === a.length && a.shift(), a = 1 < a.length ? a[1] : a[0], a) {
       case "reg":
         this.fastupdate = !1;
-        this.reg = qa(c, this.reg);
+        this.reg = ta(c, this.reg);
         break;
       case "map":
-        this.map = ma(c, this.map);
+        this.map = pa(c, this.map);
         break;
       case "ctx":
-        this.ctx = oa(c, this.ctx);
+        this.ctx = ra(c, this.ctx);
     }
   }
 };
@@ -1665,10 +1757,10 @@ w.serialize = function(a = !0) {
   d = "index.ctx=new Map([" + d + "]);";
   return a ? "function inject(index){" + c + e + d + "}" : c + e + d;
 };
-ia(Y.prototype);
-const Va = {Index:Y, Charset:Oa, Encoder:K, Document:R, Worker:null, Resolver:null, IndexedDB:null, Language:{}}, Wa = "undefined" !== typeof self ? self : "undefined" !== typeof global ? global : "undefined" !== typeof window ? window : {};
-let Xa;
-(Xa = Wa.define) && Xa.amd ? Xa([], function() {
-  return Va;
-}) : "object" === typeof Wa.exports ? Wa.exports = Va : Wa.FlexSearch = Va;
+ja(O.prototype);
+const bb = {Index:O, Charset:Va, Encoder:K, Document:V, Worker:null, Resolver:null, IndexedDB:null, Language:{}}, cb = "undefined" !== typeof self ? self : "undefined" !== typeof global ? global : "undefined" !== typeof window ? window : {};
+let db;
+(db = cb.define) && db.amd ? db([], function() {
+  return bb;
+}) : "object" === typeof cb.exports ? cb.exports = bb : cb.FlexSearch = bb;
 }(this||self));
diff --git a/dist/flexsearch.compact.min.js b/dist/flexsearch.compact.min.js
index 0e61967..1bf30ba 100644
--- a/dist/flexsearch.compact.min.js
+++ b/dist/flexsearch.compact.min.js
@@ -1,12 +1,12 @@
 /**!
- * FlexSearch.js v0.8.111 (Bundle)
+ * FlexSearch.js v0.8.113 (Bundle)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
  * https://github.com/nextapps-de/flexsearch
  */
-(function(self){'use strict';var v;function B(a,c,b){const e=typeof b,d=typeof a;if("undefined"!==e){if("undefined"!==d){if(b){if("function"===d&&e===d)return function(k){return a(b(k))};c=a.constructor;if(c===b.constructor){if(c===Array)return b.concat(a);if(c===Map){var f=new Map(b);for(var g of a)f.set(g[0],g[1]);return f}if(c===Set){g=new Set(b);for(f of a.values())g.add(f);return g}}}return a}return b}return"undefined"===d?c:a}function C(){return Object.create(null)}function E(a){return"string"===typeof a}
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+v.clear=function(){for(const a of this.index.values())a.clear();if(this.tag)for(const a of this.tag.values())a.clear();this.store&&this.store.clear();return this};v.contain=function(a){return this.reg.has(a)};v.cleanup=function(){for(const a of this.index.values())a.cleanup();return this};v.get=function(a){return this.store.get(a)};v.set=function(a,c){this.store.set(a,c);return this};v.searchCache=Ma;
+v.export=function(a,c,b=0,e=0){if(b<this.field.length){const g=this.field[b];if((c=this.index.get(g).export(a,g,b,e=1))&&c.then){const k=this;return c.then(function(){return k.export(a,g,b+1)})}return this.export(a,g,b+1)}let d,f;switch(e){case 0:d="reg";f=sa(this.reg);c=null;break;case 1:d="tag";f=qa(this.tag,this.reg.size);c=null;break;case 2:d="doc";f=oa(this.store);c=null;break;case 3:d="cfg";c=f=null;break;default:return}return ua.call(this,a,c,d,f,b,e)};
+v.import=function(a,c){var b=a.split(".");"json"===b[b.length-1]&&b.pop();a=2<b.length?b[0]:"";b=2<b.length?b[2]:b[1];if(c){"string"===typeof c&&(c=JSON.parse(c));if(a)return this.index.get(a).import(b,c);switch(b){case "reg":this.fastupdate=!1;this.reg=ta(c,this.reg);for(let e=0,d;e<this.field.length;e++)d=this.index.get(this.field[e]),d.fastupdate=!1,d.reg=this.reg;break;case "tag":this.tag=ra(c,this.tag);break;case "doc":this.store=pa(c,this.store)}}};ja(V.prototype);function Ma(a,c,b){a=("object"===typeof a?""+a.query:a).toLowerCase();this.cache||(this.cache=new Y);let e=this.cache.get(a);if(!e){e=this.search(a,c,b);if(e.then){const d=this;e.then(function(f){d.cache.set(a,f);return f})}this.cache.set(a,e)}return e}function Y(a){this.limit=a&&!0!==a?a:1E3;this.cache=new Map;this.h=""}Y.prototype.set=function(a,c){this.cache.set(this.h=a,c);this.cache.size>this.limit&&this.cache.delete(this.cache.keys().next().value)};
+Y.prototype.get=function(a){const c=this.cache.get(a);c&&this.h!==a&&(this.cache.delete(a),this.cache.set(this.h=a,c));return c};Y.prototype.remove=function(a){for(const c of this.cache){const b=c[0];c[1].includes(a)&&this.cache.delete(b)}};Y.prototype.clear=function(){this.cache.clear();this.h=""};const Na={normalize:function(a){return a.toLowerCase()}};const Oa=new Map([["b","p"],["v","f"],["w","f"],["z","s"],["x","s"],["d","t"],["n","m"],["c","k"],["g","k"],["j","k"],["q","k"],["i","e"],["y","e"],["u","o"]]);const Pa=new Map([["ae","a"],["oe","o"],["sh","s"],["kh","k"],["th","t"],["pf","f"]]),Qa=[/([^aeo])h(.)/g,"$1$2",/([aeo])h([^aeo]|$)/g,"$1$2",/([^0-9])\1+/g,"$1"];const Ra={a:"",e:"",i:"",o:"",u:"",y:"",b:1,f:1,p:1,v:1,c:2,g:2,j:2,k:2,q:2,s:2,x:2,z:2,"\u00df":2,d:3,t:3,l:4,m:5,n:5,r:6};const Sa=/[\x00-\x7F]+/g;const Ta=/[\x00-\x7F]+/g;const Ua=/[\x00-\x7F]+/g;var Va={LatinExact:{normalize:!1,dedupe:!1},LatinDefault:Na,LatinSimple:{normalize:!0,dedupe:!0},LatinBalance:{normalize:!0,dedupe:!0,mapper:Oa},LatinAdvanced:{normalize:!0,dedupe:!0,mapper:Oa,matcher:Pa,replacer:Qa},LatinExtra:{normalize:!0,dedupe:!0,mapper:Oa,replacer:Qa.concat([/(?!^)[aeo]/g,""]),matcher:Pa},LatinSoundex:{normalize:!0,dedupe:!1,include:{letter:!0},finalize:function(a){for(let b=0;b<a.length;b++){var c=a[b];let e=c.charAt(0),d=Ra[e];for(let f=1,g;f<c.length&&(g=c.charAt(f),"h"===
+g||"w"===g||!(g=Ra[g])||g===d||(e+=g,d=g,4!==e.length));f++);a[b]=e}}},ArabicDefault:{rtl:!0,normalize:!1,dedupe:!0,prepare:function(a){return(""+a).replace(Sa," ")}},CjkDefault:{normalize:!1,dedupe:!0,split:"",prepare:function(a){return(""+a).replace(Ta,"")}},CyrillicDefault:{normalize:!1,dedupe:!0,prepare:function(a){return(""+a).replace(Ua," ")}}};const Wa={memory:{resolution:1},performance:{resolution:6,fastupdate:!0,context:{depth:1,resolution:3}},match:{tokenize:"forward"},score:{resolution:9,context:{depth:2,resolution:9}}};O.prototype.add=function(a,c,b,e){if(c&&(a||0===a)){if(!e&&!b&&this.reg.has(a))return this.update(a,c);c=this.encoder.encode(c);if(e=c.length){const l=C(),m=C(),n=this.depth,t=this.resolution;for(let p=0;p<e;p++){let q=c[this.rtl?e-1-p:p];var d=q.length;if(d&&(n||!m[q])){var f=this.score?this.score(c,q,p,null,0):Xa(t,e,p),g="";switch(this.tokenize){case "full":if(2<d){for(f=0;f<d;f++)for(var k=d;k>f;k--){g=q.substring(f,k);var h=this.score?this.score(c,q,p,g,f):Xa(t,e,p,d,f);Z(this,m,g,h,a,b)}break}case "reverse":if(1<
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+function Z(a,c,b,e,d,f,g){let k=g?a.ctx:a.map,h;if(!c[b]||g&&!(h=c[b])[g])g?(c=h||(c[b]=C()),c[g]=1,(h=k.get(g))?k=h:k.set(g,k=new Map)):c[b]=1,(h=k.get(b))?k=h:k.set(b,k=[]),k=k[e]||(k[e]=[]),f&&k.includes(d)||(k.push(d),a.fastupdate&&((c=a.reg.get(d))?c.push(k):a.reg.set(d,[k])))}function Xa(a,c,b,e,d){return b&&1<a?c+(e||0)<=a?b+(d||0):(a-1)/(c+(e||0))*(b+(d||0))+1|0:0};O.prototype.search=function(a,c,b){b||(!c&&H(a)?(b=a,a=""):H(c)&&(b=c,c=0));var e=[],d=0;if(b){a=b.query||a;c=b.limit||c;d=b.offset||0;var f=b.context;var g=b.suggest;var k=!0;var h=b.resolution}else k=!0;a=this.encoder.encode(a);b=a.length;c=c||(k?100:0);if(1===b)return g=c,(c=Za(this,a[0],""))&&c.length?Aa.call(this,c,g,d):[];f=this.depth&&!1!==f;if(2===b&&f&&!g)return g=c,(c=Za(this,a[0],a[1]))&&c.length?Aa.call(this,c,g,d):[];k=C();let l=0;if(1<b&&f){var m=a[0];l=1}h||0===h||(h=m?this.S:this.resolution);
+for(let q,y;l<b;l++){if((y=a[l])&&!k[y]){k[y]=1;q=Za(this,y,m);a:{f=q;var n=e,t=g,p=h;let w=[];if(f&&f.length){if(f.length<=p){n.push(f);q=void 0;break a}for(let u=0,z;u<p;u++)if(z=f[u])w[u]=z;if(w.length){n.push(w);q=void 0;break a}}q=t?void 0:w}if(q){e=q;break}m&&(g&&q&&e.length||(m=y))}g&&m&&l===b-1&&!e.length&&(m="",l=-1,k=C())}a:{a=e;e=a.length;m=a;if(1<e)m=xa(a,h,c,d,g);else if(1===e){g=Aa.call(null,a[0],c,d);break a}g=m}return g};
+function Za(a,c,b){let e;b&&(e=a.bidirectional&&c>b)&&(e=b,b=c,c=e);a=b?(a=a.ctx.get(b))&&a.get(c):a.map.get(c);return a};O.prototype.remove=function(a,c){const b=this.reg.size&&(this.fastupdate?this.reg.get(a):this.reg.has(a));if(b){if(this.fastupdate)for(let e=0,d;e<b.length;e++){if(d=b[e])if(2>d.length)d.pop();else{const f=d.indexOf(a);f===b.length-1?d.pop():d.splice(f,1)}}else $a(this.map,a),this.depth&&$a(this.ctx,a);c||this.reg.delete(a)}this.cache&&this.cache.remove(a);return this};
+function $a(a,c){let b=0;if(a.constructor===Array)for(let e=0,d,f;e<a.length;e++){if((d=a[e])&&d.length)if(f=d.indexOf(c),0<=f){1<d.length?(d.splice(f,1),b++):delete a[e];break}else b++}else for(let e of a.entries()){const d=e[0],f=$a(e[1],c);f?b+=f:a.delete(d)}return b};function O(a,c){if(!this||this.constructor!==O)return new O(a);if(a){var b=D(a)?a:a.preset;b&&(a=Object.assign({},Wa[b],a))}else a={};b=a.context;const e=!0===b?{depth:1}:b||{},d=D(a.encoder)?Va[a.encoder]:a.encode||a.encoder||Na;this.encoder=d.encode?d:"object"===typeof d?new K(d):{encode:d};this.resolution=a.resolution||9;this.tokenize=(b=a.tokenize)&&"default"!==b&&b||"strict";this.depth="strict"===b&&e.depth||0;this.bidirectional=!1!==e.bidirectional;this.fastupdate=!!a.fastupdate;this.score=
+a.score||null;b=!1;this.map=new Map;this.ctx=new Map;this.reg=c||(this.fastupdate?new Map:new Set);this.S=e.resolution||3;this.rtl=d.rtl||a.rtl||!1;this.cache=(b=a.cache||null)&&new Y(b);this.priority=a.priority||4}v=O.prototype;v.clear=function(){this.map.clear();this.ctx.clear();this.reg.clear();this.cache&&this.cache.clear();return this};v.append=function(a,c){return this.add(a,c,!0)};v.contain=function(a){return this.reg.has(a)};
+v.update=function(a,c){const b=this,e=this.remove(a);return e&&e.then?e.then(()=>b.add(a,c)):this.add(a,c)};function ab(a){let c=0;if(a.constructor===Array)for(let b=0,e;b<a.length;b++)(e=a[b])&&(c+=e.length);else for(const b of a){const e=b[0],d=ab(b[1]);d?c+=d:a.delete(e)}return c}v.cleanup=function(){if(!this.fastupdate)return this;ab(this.map);this.depth&&ab(this.ctx);return this};v.searchCache=Ma;
+v.export=function(a,c,b=0,e=0){let d,f;switch(e){case 0:d="reg";f=sa(this.reg);break;case 1:d="cfg";f=null;break;case 2:d="map";f=oa(this.map,this.reg.size);break;case 3:d="ctx";f=qa(this.ctx,this.reg.size);break;default:return}return ua.call(this,a,c,d,f,b,e)};
+v.import=function(a,c){if(c)switch("string"===typeof c&&(c=JSON.parse(c)),a=a.split("."),"json"===a[a.length-1]&&a.pop(),3===a.length&&a.shift(),a=1<a.length?a[1]:a[0],a){case "reg":this.fastupdate=!1;this.reg=ta(c,this.reg);break;case "map":this.map=pa(c,this.map);break;case "ctx":this.ctx=ra(c,this.ctx)}};
 v.serialize=function(a=!0){if(!this.reg.size)return"";let c="",b="";for(var e of this.reg.keys())b||(b=typeof e),c+=(c?",":"")+("string"===b?'"'+e+'"':e);c="index.reg=new Set(["+c+"]);";e="";for(var d of this.map.entries()){var f=d[0],g=d[1],k="";for(let m=0,n;m<g.length;m++){n=g[m]||[""];var h="";for(var l=0;l<n.length;l++)h+=(h?",":"")+("string"===b?'"'+n[l]+'"':n[l]);h="["+h+"]";k+=(k?",":"")+h}k='["'+f+'",['+k+"]]";e+=(e?",":"")+k}e="index.map=new Map(["+e+"]);";d="";for(const m of this.ctx.entries()){f=
-m[0];g=m[1];for(const n of g.entries()){g=n[0];k=n[1];h="";for(let t=0,p;t<k.length;t++){p=k[t]||[""];l="";for(let q=0;q<p.length;q++)l+=(l?",":"")+("string"===b?'"'+p[q]+'"':p[q]);l="["+l+"]";h+=(h?",":"")+l}h='new Map([["'+g+'",['+h+"]]])";h='["'+f+'",'+h+"]";d+=(d?",":"")+h}}d="index.ctx=new Map(["+d+"]);";return a?"function inject(index){"+c+e+d+"}":c+e+d};ia(Y.prototype);const Va={Index:Y,Charset:Oa,Encoder:K,Document:R,Worker:null,Resolver:null,IndexedDB:null,Language:{}},Wa="undefined"!==typeof self?self:"undefined"!==typeof global?global:"undefined"!==typeof window?window:{};let Xa;(Xa=Wa.define)&&Xa.amd?Xa([],function(){return Va}):"object"===typeof Wa.exports?Wa.exports=Va:Wa.FlexSearch=Va;}(this||self));
+m[0];g=m[1];for(const n of g.entries()){g=n[0];k=n[1];h="";for(let t=0,p;t<k.length;t++){p=k[t]||[""];l="";for(let q=0;q<p.length;q++)l+=(l?",":"")+("string"===b?'"'+p[q]+'"':p[q]);l="["+l+"]";h+=(h?",":"")+l}h='new Map([["'+g+'",['+h+"]]])";h='["'+f+'",'+h+"]";d+=(d?",":"")+h}}d="index.ctx=new Map(["+d+"]);";return a?"function inject(index){"+c+e+d+"}":c+e+d};ja(O.prototype);const bb={Index:O,Charset:Va,Encoder:K,Document:V,Worker:null,Resolver:null,IndexedDB:null,Language:{}},cb="undefined"!==typeof self?self:"undefined"!==typeof global?global:"undefined"!==typeof window?window:{};let db;(db=cb.define)&&db.amd?db([],function(){return bb}):"object"===typeof cb.exports?cb.exports=bb:cb.FlexSearch=bb;}(this||self));
diff --git a/dist/flexsearch.compact.module.debug.js b/dist/flexsearch.compact.module.debug.js
index f89dc02..d5c126b 100644
--- a/dist/flexsearch.compact.module.debug.js
+++ b/dist/flexsearch.compact.module.debug.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.111 (Bundle/Debug)
+ * FlexSearch.js v0.8.113 (Bundle/Debug)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -46,14 +46,14 @@ function B(a, c, b) {
 function C() {
   return Object.create(null);
 }
-function E(a) {
+function D(a) {
   return "string" === typeof a;
 }
 function I(a) {
   return "object" === typeof a;
 }
 function J(a, c) {
-  if (E(c)) {
+  if (D(c)) {
     a = a[c];
   } else {
     for (let b = 0; a && b < c.length; b++) {
@@ -261,30 +261,61 @@ function L(a) {
   a.F.clear();
   a.G.clear();
 }
-;function ia(a) {
-  M.call(a, "add");
-  M.call(a, "append");
-  M.call(a, "search");
-  M.call(a, "update");
-  M.call(a, "remove");
+;let M, N;
+async function ia(a) {
+  a = a.data;
+  var c = a.task;
+  const b = a.id;
+  let e = a.args;
+  switch(c) {
+    case "init":
+      N = a.options || {};
+      (c = a.factory) ? (Function("return " + c)()(self), M = new self.FlexSearch.Index(N), delete self.FlexSearch) : M = new O(N);
+      postMessage({id:b});
+      break;
+    default:
+      let d;
+      if ("export" === c) {
+        if (!N.export || "function" !== typeof N.export) {
+          throw Error('Either no extern configuration provided for the Worker-Index or no method was defined on the config property "export".');
+        }
+        e[1] ? (e[0] = N.export, e[2] = 0, e[3] = 1) : e = null;
+      }
+      if ("import" === c) {
+        if (!N.import || "function" !== typeof N.import) {
+          throw Error('Either no extern configuration provided for the Worker-Index or no method was defined on the config property "import".');
+        }
+        e[0] && (a = await N.import.call(M, e[0]), M.import(e[0], a));
+      } else {
+        (d = e && M[c].apply(M, e)) && d.then && (d = await d);
+      }
+      postMessage("search" === c ? {id:b, msg:d} : {id:b});
+  }
 }
-let N, ja;
-const O = {}, P = {};
-function ka(a) {
-  N = 0;
-  O[a] = P[a];
+;function ja(a) {
+  P.call(a, "add");
+  P.call(a, "append");
+  P.call(a, "search");
+  P.call(a, "update");
+  P.call(a, "remove");
 }
-function M(a) {
+let Q, ka;
+const R = {}, S = {};
+function la(a) {
+  Q = 0;
+  R[a] = S[a];
+}
+function P(a) {
   this[a + "Async"] = function() {
     const c = arguments;
     var b = c[c.length - 1];
     let e;
     "function" === typeof b && (e = b, delete c[c.length - 1]);
-    N || (N = setTimeout(ka, 0, a), ja = Date.now());
-    P[a] || (P[a] = O[a] = 1000);
-    if (!--O[a]) {
-      O[a] = P[a] = P[a] * this.priority * this.priority * 3 / (Date.now() - ja) | 0 || 1;
-      N = clearTimeout(N);
+    Q || (Q = setTimeout(la, 0, a), ka = Date.now());
+    S[a] || (S[a] = R[a] = 1000);
+    if (!--R[a]) {
+      R[a] = S[a] = S[a] * this.priority * this.priority * 3 / (Date.now() - ka) | 0 || 1;
+      Q = clearTimeout(Q);
       const f = this;
       return new Promise(g => {
         setTimeout(function() {
@@ -298,7 +329,68 @@ function M(a) {
     return b;
   };
 }
-;function la(a, c = 0) {
+;let T = 0;
+function ma(a = {}) {
+  function c(g) {
+    function k(h) {
+      h = h.data || h;
+      const l = h.id, m = l && d.h[l];
+      m && (m(h.msg), delete d.h[l]);
+    }
+    this.worker = g;
+    this.h = C();
+    if (this.worker) {
+      e ? this.worker.on("message", k) : this.worker.onmessage = k;
+      if (a.config) {
+        return new Promise(function(h) {
+          d.h[++T] = function() {
+            h(d);
+          };
+          d.worker.postMessage({id:T, task:"init", factory:b, options:a});
+        });
+      }
+      this.worker.postMessage({task:"init", factory:b, options:a});
+      return this;
+    }
+  }
+  if (!this || this.constructor !== ma) {
+    return new ma(a);
+  }
+  let b = "undefined" !== typeof self ? self._factory : "undefined" !== typeof window ? window._factory : null;
+  b && (b = b.toString());
+  const e = "undefined" === typeof window, d = this, f = na(b, e, a.worker);
+  return f.then ? f.then(function(g) {
+    return c.call(d, g);
+  }) : c.call(this, f);
+}
+U("add");
+U("append");
+U("search");
+U("update");
+U("remove");
+U("clear");
+U("export");
+U("import");
+ja(ma.prototype);
+function U(a) {
+  ma.prototype[a] = function() {
+    const c = this, b = [].slice.call(arguments);
+    var e = b[b.length - 1];
+    let d;
+    "function" === typeof e && (d = e, b.pop());
+    e = new Promise(function(f) {
+      "export" === a && "function" === typeof b[0] && (b[0] = null);
+      c.h[++T] = f;
+      c.worker.postMessage({task:a, id:T, args:b});
+    });
+    return d ? (e.then(d), this) : e;
+  };
+}
+function na(a, c, b) {
+  return c ? "undefined" !== typeof module ? new (require("worker_threads")["Worker"])(__dirname + "/node/node.js") : import("worker_threads").then(function(worker){ return new worker["Worker"](import.meta.dirname + "/node/node.mjs"); }) : a ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + ia.toString()], {type:"text/javascript"}))) : new window.Worker("string" === typeof b ? b : import.meta.url.replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", 
+  "module/worker/worker.js"), {type:"module"});
+}
+;function oa(a, c = 0) {
   let b = [], e = [];
   c && (c = 250000 / c * 5000 | 0);
   for (const d of a.entries()) {
@@ -307,30 +399,30 @@ function M(a) {
   e.length && b.push(e);
   return b;
 }
-function ma(a, c) {
+function pa(a, c) {
   c || (c = new Map());
   for (let b = 0, e; b < a.length; b++) {
     e = a[b], c.set(e[0], e[1]);
   }
   return c;
 }
-function na(a, c = 0) {
+function qa(a, c = 0) {
   let b = [], e = [];
   c && (c = 250000 / c * 1000 | 0);
   for (const d of a.entries()) {
-    e.push([d[0], la(d[1])[0]]), e.length === c && (b.push(e), e = []);
+    e.push([d[0], oa(d[1])[0]]), e.length === c && (b.push(e), e = []);
   }
   e.length && b.push(e);
   return b;
 }
-function oa(a, c) {
+function ra(a, c) {
   c || (c = new Map());
   for (let b = 0, e, d; b < a.length; b++) {
-    e = a[b], d = c.get(e[0]), c.set(e[0], ma(e[1], d));
+    e = a[b], d = c.get(e[0]), c.set(e[0], pa(e[1], d));
   }
   return c;
 }
-function pa(a) {
+function sa(a) {
   let c = [], b = [];
   for (const e of a.keys()) {
     b.push(e), 250000 === b.length && (c.push(b), b = []);
@@ -338,14 +430,14 @@ function pa(a) {
   b.length && c.push(b);
   return c;
 }
-function qa(a, c) {
+function ta(a, c) {
   c || (c = new Set());
   for (let b = 0; b < a.length; b++) {
     c.add(a[b]);
   }
   return c;
 }
-function Q(a, c, b, e, d, f, g = 0) {
+function ua(a, c, b, e, d, f, g = 0) {
   const k = e && e.constructor === Array;
   var h = k ? e.shift() : e;
   if (!h) {
@@ -354,12 +446,12 @@ function Q(a, c, b, e, d, f, g = 0) {
   if ((h = a((c ? c + "." : "") + (g + 1) + "." + b, JSON.stringify(h))) && h.then) {
     const l = this;
     return h.then(function() {
-      return Q.call(l, a, c, b, k ? e : null, d, f, g + 1);
+      return ua.call(l, a, c, b, k ? e : null, d, f, g + 1);
     });
   }
-  return Q.call(this, a, c, b, k ? e : null, d, f, g + 1);
+  return ua.call(this, a, c, b, k ? e : null, d, f, g + 1);
 }
-;R.prototype.add = function(a, c, b) {
+;V.prototype.add = function(a, c, b) {
   I(a) && (c = a, a = J(c, this.key));
   if (c && (a || 0 === a)) {
     if (!b && this.reg.has(a)) {
@@ -373,7 +465,7 @@ function Q(a, c, b, e, d, f, g = 0) {
         d && e.add(a, d, !1, !0);
       } else {
         if (d = h.I, !d || d(c)) {
-          h.constructor === String ? h = ["" + h] : E(h) && (h = [h]), ra(c, h, this.J, 0, e, a, h[0], b);
+          h.constructor === String ? h = ["" + h] : D(h) && (h = [h]), va(c, h, this.J, 0, e, a, h[0], b);
         }
       }
     }
@@ -395,7 +487,7 @@ function Q(a, c, b, e, d, f, g = 0) {
           f = J(c, f);
         }
         if (d && f) {
-          E(f) && (f = [f]);
+          D(f) && (f = [f]);
           for (let h = 0, l, m; h < f.length; h++) {
             l = f[h], k[l] || (k[l] = 1, (g = d.get(l)) ? m = g : d.set(l, m = []), b && m.includes(a) || (m.push(a), this.fastupdate && ((g = this.reg.get(a)) ? g.push(m) : this.reg.set(a, [m]))));
           }
@@ -420,11 +512,11 @@ function Q(a, c, b, e, d, f, g = 0) {
               continue;
             }
             l = [l.U];
-          } else if (E(l) || l.constructor === String) {
+          } else if (D(l) || l.constructor === String) {
             k[l] = c[l];
             continue;
           }
-          sa(c, k, l, 0, l[0], m);
+          wa(c, k, l, 0, l[0], m);
         }
       }
       this.store.set(a, k || c);
@@ -432,21 +524,21 @@ function Q(a, c, b, e, d, f, g = 0) {
   }
   return this;
 };
-function sa(a, c, b, e, d, f) {
+function wa(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++) {
-        sa(a, c, b, e, d);
+        wa(a, c, b, e, d);
       }
     } else {
-      c = c[d] || (c[d] = C()), d = b[++e], sa(a, c, b, e, d);
+      c = c[d] || (c[d] = C()), d = b[++e], wa(a, c, b, e, d);
     }
   }
 }
-function ra(a, c, b, e, d, f, g, k) {
+function va(a, c, b, e, d, f, g, k) {
   if (a = a[g]) {
     if (e === c.length - 1) {
       if (a.constructor === Array) {
@@ -462,15 +554,15 @@ function ra(a, c, b, e, d, f, g, k) {
     } else {
       if (a.constructor === Array) {
         for (g = 0; g < a.length; g++) {
-          ra(a, c, b, e, d, f, g, k);
+          va(a, c, b, e, d, f, g, k);
         }
       } else {
-        g = c[++e], ra(a, c, b, e, d, f, g, k);
+        g = c[++e], va(a, c, b, e, d, f, g, k);
       }
     }
   }
 }
-;function ta(a, c, b, e, d) {
+;function xa(a, c, b, e, d) {
   const f = a.length;
   let g = [], k, h;
   k = C();
@@ -485,7 +577,7 @@ function ra(a, c, b, e, d, f, g, k) {
   }
   if (a = g.length) {
     if (d) {
-      g = 1 < g.length ? ua(g, b, e) : (g = g[0]).length > b || e ? g.slice(e, b + e) : g;
+      g = 1 < g.length ? ya(g, b, e) : (g = g[0]).length > b || e ? g.slice(e, b + e) : g;
     } else {
       if (a < f) {
         return [];
@@ -500,7 +592,7 @@ function ra(a, c, b, e, d, f, g, k) {
   }
   return g;
 }
-function ua(a, c, b) {
+function ya(a, c, b) {
   const e = [], d = C();
   let f;
   var g = a.length;
@@ -522,7 +614,7 @@ function ua(a, c, b) {
   }
   return e;
 }
-function va(a, c) {
+function za(a, c) {
   const b = C(), e = [];
   for (let d = 0, f; d < c.length; d++) {
     f = c[d];
@@ -535,12 +627,12 @@ function va(a, c) {
   }
   return e;
 }
-;function S(a, c, b, e) {
+;function Aa(a, c, b, e) {
   if (!a.length) {
     return a;
   }
   if (1 === a.length) {
-    return a = a[0], a = b || a.length > c ? c ? a.slice(b, b + c) : a.slice(b) : a, e ? T.call(this, a) : a;
+    return a = a[0], a = b || a.length > c ? c ? a.slice(b, b + c) : a.slice(b) : a, e ? W.call(this, a) : a;
   }
   let d = [];
   for (let f = 0, g, k; f < a.length; f++) {
@@ -554,7 +646,7 @@ function va(a, c) {
       }
       k > c && (g = g.slice(0, c), k = c);
       if (!d.length && k >= c) {
-        return e ? T.call(this, g) : g;
+        return e ? W.call(this, g) : g;
       }
       d.push(g);
       c -= k;
@@ -564,9 +656,9 @@ function va(a, c) {
     }
   }
   d = 1 < d.length ? [].concat.apply([], d) : d[0];
-  return e ? T.call(this, d) : d;
+  return e ? W.call(this, d) : d;
 }
-;function U(a, c, b) {
+;function Ba(a, c, b) {
   var e = b[0];
   if (e.then) {
     return Promise.all(b).then(function(m) {
@@ -581,7 +673,7 @@ function va(a, c) {
   for (let m = 0, n; m < b.length; m++) {
     if (n = b[m]) {
       let t;
-      if (n.constructor === V) {
+      if (n.constructor === X) {
         t = n.result;
       } else if (n.constructor === Array) {
         t = n;
@@ -612,11 +704,11 @@ function va(a, c) {
   }
   return {O:e, P:d, limit:f, offset:g, enrich:k, resolve:h, suggest:l};
 }
-;V.prototype.or = function() {
-  const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f} = U(this, "or", arguments);
-  return wa.call(this, a, c, b, e, d, f);
+;X.prototype.or = function() {
+  const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f} = Ba(this, "or", arguments);
+  return Ca.call(this, a, c, b, e, d, f);
 };
-function wa(a, c, b, e, d, f) {
+function Ca(a, c, b, e, d, f) {
   if (c.length) {
     const g = this;
     return Promise.all(c).then(function(k) {
@@ -624,25 +716,25 @@ function wa(a, c, b, e, d, f) {
       for (let h = 0, l; h < k.length; h++) {
         (l = k[h]).length && (a[h] = l);
       }
-      return wa.call(g, a, [], b, e, d, f);
+      return Ca.call(g, a, [], b, e, d, f);
     });
   }
-  a.length && (this.result.length && a.push(this.result), 2 > a.length ? this.result = a[0] : (this.result = ua(a, b, e), e = 0));
+  a.length && (this.result.length && a.push(this.result), 2 > a.length ? this.result = a[0] : (this.result = ya(a, b, e), e = 0));
   return f ? this.resolve(b, e, d) : this;
 }
-;V.prototype.and = function() {
+;X.prototype.and = function() {
   let a = this.result.length, c, b, e, d;
   if (!a) {
     const f = arguments[0];
     f && (a = !!f.suggest, d = f.resolve, c = f.limit, b = f.offset, e = f.enrich && d);
   }
   if (a) {
-    const {O:f, P:g, limit:k, offset:h, enrich:l, resolve:m, suggest:n} = U(this, "and", arguments);
-    return xa.call(this, f, g, k, h, l, m, n);
+    const {O:f, P:g, limit:k, offset:h, enrich:l, resolve:m, suggest:n} = Ba(this, "and", arguments);
+    return Da.call(this, f, g, k, h, l, m, n);
   }
   return d ? this.resolve(c, b, e) : this;
 };
-function xa(a, c, b, e, d, f, g) {
+function Da(a, c, b, e, d, f, g) {
   if (c.length) {
     const k = this;
     return Promise.all(c).then(function(h) {
@@ -650,7 +742,7 @@ function xa(a, c, b, e, d, f, g) {
       for (let l = 0, m; l < h.length; l++) {
         (m = h[l]).length && (a[l] = m);
       }
-      return xa.call(k, a, [], b, e, d, f, g);
+      return Da.call(k, a, [], b, e, d, f, g);
     });
   }
   if (a.length) {
@@ -658,7 +750,7 @@ function xa(a, c, b, e, d, f, g) {
       this.result = a[0];
     } else {
       if (c = aa(a)) {
-        return this.result = ta(a, c, b, e, g), f ? d ? T.call(this.index, this.result) : this.result : this;
+        return this.result = xa(a, c, b, e, g), f ? d ? W.call(this.index, this.result) : this.result : this;
       }
       this.result = [];
     }
@@ -667,11 +759,11 @@ function xa(a, c, b, e, d, f, g) {
   }
   return f ? this.resolve(b, e, d) : this;
 }
-;V.prototype.xor = function() {
-  const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f, suggest:g} = U(this, "xor", arguments);
-  return ya.call(this, a, c, b, e, d, f, g);
+;X.prototype.xor = function() {
+  const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f, suggest:g} = Ba(this, "xor", arguments);
+  return Ea.call(this, a, c, b, e, d, f, g);
 };
-function ya(a, c, b, e, d, f, g) {
+function Ea(a, c, b, e, d, f, g) {
   if (c.length) {
     const k = this;
     return Promise.all(c).then(function(h) {
@@ -679,21 +771,21 @@ function ya(a, c, b, e, d, f, g) {
       for (let l = 0, m; l < h.length; l++) {
         (m = h[l]).length && (a[l] = m);
       }
-      return ya.call(k, a, [], b, e, d, f, g);
+      return Ea.call(k, a, [], b, e, d, f, g);
     });
   }
   if (a.length) {
     if (this.result.length && a.unshift(this.result), 2 > a.length) {
       this.result = a[0];
     } else {
-      return this.result = za.call(this, a, b, e, f, this.h), f ? d ? T.call(this.index, this.result) : this.result : this;
+      return this.result = Fa.call(this, a, b, e, f, this.h), f ? d ? W.call(this.index, this.result) : this.result : this;
     }
   } else {
     g || (this.result = a);
   }
   return f ? this.resolve(b, e, d) : this;
 }
-function za(a, c, b, e, d) {
+function Fa(a, c, b, e, d) {
   const f = [], g = C();
   let k = 0;
   for (let h = 0, l; h < a.length; h++) {
@@ -738,11 +830,11 @@ function za(a, c, b, e, d) {
   }
   return f;
 }
-;V.prototype.not = function() {
-  const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f, suggest:g} = U(this, "not", arguments);
-  return Aa.call(this, a, c, b, e, d, f, g);
+;X.prototype.not = function() {
+  const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f, suggest:g} = Ba(this, "not", arguments);
+  return Ga.call(this, a, c, b, e, d, f, g);
 };
-function Aa(a, c, b, e, d, f, g) {
+function Ga(a, c, b, e, d, f, g) {
   if (c.length) {
     const k = this;
     return Promise.all(c).then(function(h) {
@@ -750,17 +842,17 @@ function Aa(a, c, b, e, d, f, g) {
       for (let l = 0, m; l < h.length; l++) {
         (m = h[l]).length && (a[l] = m);
       }
-      return Aa.call(k, a, [], b, e, d, f, g);
+      return Ga.call(k, a, [], b, e, d, f, g);
     });
   }
   if (a.length && this.result.length) {
-    this.result = Ba.call(this, a, b, e, f);
+    this.result = Ha.call(this, a, b, e, f);
   } else if (f) {
     return this.resolve(b, e, d);
   }
-  return f ? d ? T.call(this.index, this.result) : this.result : this;
+  return f ? d ? W.call(this.index, this.result) : this.result : this;
 }
-function Ba(a, c, b, e) {
+function Ha(a, c, b, e) {
   const d = [];
   a = new Set(a.flat().flat());
   for (let f = 0, g, k = 0; f < this.result.length; f++) {
@@ -786,9 +878,9 @@ function Ba(a, c, b, e) {
   }
   return d;
 }
-;function V(a) {
-  if (!this || this.constructor !== V) {
-    return new V(a);
+;function X(a) {
+  if (!this || this.constructor !== X) {
+    return new X(a);
   }
   if (a && a.index) {
     return a.resolve = !1, this.index = a.index, this.h = a.boost || 0, this.result = a.index.search(a).result, this;
@@ -797,7 +889,7 @@ function Ba(a, c, b, e) {
   this.result = a || [];
   this.h = 0;
 }
-V.prototype.limit = function(a) {
+X.prototype.limit = function(a) {
   if (this.result.length) {
     const c = [];
     for (let b = 0, e; b < this.result.length; b++) {
@@ -816,7 +908,7 @@ V.prototype.limit = function(a) {
   }
   return this;
 };
-V.prototype.offset = function(a) {
+X.prototype.offset = function(a) {
   if (this.result.length) {
     const c = [];
     for (let b = 0, e; b < this.result.length; b++) {
@@ -828,17 +920,17 @@ V.prototype.offset = function(a) {
   }
   return this;
 };
-V.prototype.boost = function(a) {
+X.prototype.boost = function(a) {
   this.h += a;
   return this;
 };
-V.prototype.resolve = function(a, c, b) {
+X.prototype.resolve = function(a, c, b) {
   const e = this.result, d = this.index;
   this.result = this.index = null;
-  return e.length ? ("object" === typeof a && (b = a.enrich, c = a.offset, a = a.limit), S.call(d, e, a || 100, c, b)) : e;
+  return e.length ? ("object" === typeof a && (b = a.enrich, c = a.offset, a = a.limit), Aa.call(d, e, a || 100, c, b)) : e;
 };
 C();
-R.prototype.search = function(a, c, b, e) {
+V.prototype.search = function(a, c, b, e) {
   b || (!c && I(a) ? (b = a, a = "") : I(c) && (b = c, c = 0));
   let d = [];
   var f = [];
@@ -863,7 +955,7 @@ R.prototype.search = function(a, c, b, e) {
       var u = [];
       for (let x = 0, r; x < m.length; x++) {
         r = m[x];
-        if (E(r)) {
+        if (D(r)) {
           throw Error("A tag option can't be a string, instead it needs a { field: tag } format.");
         }
         if (r.field && r.tag) {
@@ -877,8 +969,8 @@ R.prototype.search = function(a, c, b, e) {
           }
         } else {
           v = Object.keys(r);
-          for (let D = 0, F, A; D < v.length; D++) {
-            if (F = v[D], A = r[F], A.constructor === Array) {
+          for (let E = 0, F, A; E < v.length; E++) {
+            if (F = v[E], A = r[F], A.constructor === Array) {
               for (z = 0; z < A.length; z++) {
                 u.push(F, A[z]);
               }
@@ -896,7 +988,7 @@ R.prototype.search = function(a, c, b, e) {
         e = [];
         if (u.length) {
           for (f = 0; f < u.length; f += 2) {
-            y = Ca.call(this, u[f], u[f + 1], c, n, g), d.push({field:u[f], tag:u[f + 1], result:y});
+            y = Ia.call(this, u[f], u[f + 1], c, n, g), d.push({field:u[f], tag:u[f + 1], result:y});
           }
         }
         return e.length ? Promise.all(e).then(function(x) {
@@ -911,14 +1003,14 @@ R.prototype.search = function(a, c, b, e) {
   }
   l || (l = this.field);
   u = !e && (this.worker || this.db) && [];
-  for (let x = 0, r, D, F; x < l.length; x++) {
-    D = l[x];
+  for (let x = 0, r, E, F; x < l.length; x++) {
+    E = l[x];
     let A;
-    E(D) || (A = D, D = A.field, a = A.query || a, c = A.limit || c, n = A.offset || n, h = A.suggest || h, g = this.store && (A.enrich || g));
+    D(E) || (A = E, E = A.field, a = A.query || a, c = A.limit || c, n = A.offset || n, h = A.suggest || h, g = this.store && (A.enrich || g));
     if (e) {
       r = e[x];
     } else {
-      if (v = A || b, z = this.index.get(D), m && (v.enrich = !1), u) {
+      if (v = A || b, z = this.index.get(E), m && (v.enrich = !1), u) {
         u[x] = z.search(a, c, v);
         v && g && (v.enrich = g);
         continue;
@@ -930,34 +1022,34 @@ R.prototype.search = function(a, c, b, e) {
     if (m && F) {
       v = [];
       z = 0;
-      for (let G = 0, H, Pa; G < m.length; G += 2) {
+      for (let G = 0, H, Wa; G < m.length; G += 2) {
         H = this.tag.get(m[G]);
         if (!H) {
           if (console.warn("Tag '" + m[G] + ":" + m[G + 1] + "' will be skipped because there is no field '" + m[G] + "'."), h) {
             continue;
           } else {
-            return p ? d : new V(d);
+            return p ? d : new X(d);
           }
         }
-        if (Pa = (H = H && H.get(m[G + 1])) && H.length) {
+        if (Wa = (H = H && H.get(m[G + 1])) && H.length) {
           z++, v.push(H);
         } else if (!h) {
-          return p ? d : new V(d);
+          return p ? d : new X(d);
         }
       }
       if (z) {
-        r = va(r, v);
+        r = za(r, v);
         F = r.length;
         if (!F && !h) {
-          return p ? r : new V(r);
+          return p ? r : new X(r);
         }
         z--;
       }
     }
     if (F) {
-      f[t] = D, d.push(r), t++;
+      f[t] = E, d.push(r), t++;
     } else if (1 === l.length) {
-      return p ? d : new V(d);
+      return p ? d : new X(d);
     }
   }
   if (u) {
@@ -967,7 +1059,7 @@ R.prototype.search = function(a, c, b, e) {
     });
   }
   if (!t) {
-    return p ? d : new V(d);
+    return p ? d : new X(d);
   }
   if (y && (!g || !this.store)) {
     return d[0];
@@ -975,15 +1067,15 @@ R.prototype.search = function(a, c, b, e) {
   u = [];
   for (let x = 0, r; x < f.length; x++) {
     r = d[x];
-    g && r.length && !r[0].doc && (r = T.call(this, r));
+    g && r.length && !r[0].doc && (r = W.call(this, r));
     if (y) {
-      return p ? r : new V(r);
+      return p ? r : new X(r);
     }
     d[x] = {field:f[x], result:r};
   }
-  return k ? Da(d, c) : q ? Ea(d, a, this.index, this.field, this.C, q) : d;
+  return k ? Ja(d, c) : q ? Ka(d, a, this.index, this.field, this.C, q) : d;
 };
-function Ea(a, c, b, e, d, f) {
+function Ka(a, c, b, e, d, f) {
   let g, k, h;
   for (let m = 0, n, t, p, q, y; m < a.length; m++) {
     n = a[m].result;
@@ -998,21 +1090,21 @@ function Ea(a, c, b, e, d, f) {
       var l = J(n[u].doc, y);
       let z = g.encode(l);
       l = l.split(g.split);
-      for (let x = 0, r, D; x < z.length; x++) {
+      for (let x = 0, r, E; x < z.length; x++) {
         r = z[x];
-        D = l[x];
+        E = l[x];
         let F;
         for (let A = 0, G; A < k.length; A++) {
           if (G = k[A], "strict" === h) {
             if (r === G) {
-              v += (v ? " " : "") + f.replace("$1", D);
+              v += (v ? " " : "") + f.replace("$1", E);
               F = !0;
               break;
             }
           } else {
             const H = r.indexOf(G);
             if (-1 < H) {
-              v += (v ? " " : "") + D.substring(0, H) + f.replace("$1", D.substring(H, G.length)) + D.substring(H + G.length);
+              v += (v ? " " : "") + E.substring(0, H) + f.replace("$1", E.substring(H, G.length)) + E.substring(H + G.length);
               F = !0;
               break;
             }
@@ -1025,7 +1117,7 @@ function Ea(a, c, b, e, d, f) {
   }
   return a;
 }
-function Da(a, c) {
+function Ja(a, c) {
   const b = [], e = C();
   for (let d = 0, f, g; d < a.length; d++) {
     f = a[d];
@@ -1044,7 +1136,7 @@ function Da(a, c) {
   }
   return b;
 }
-function Ca(a, c, b, e, d) {
+function Ia(a, c, b, e, d) {
   let f = this.tag.get(a);
   if (!f) {
     return console.warn("Tag '" + a + "' was not found"), [];
@@ -1053,11 +1145,11 @@ function Ca(a, c, b, e, d) {
     if (a > b || e) {
       f = f.slice(e, e + b);
     }
-    d && (f = T.call(this, f));
+    d && (f = W.call(this, f));
     return f;
   }
 }
-function T(a) {
+function W(a) {
   if (!this || !this.store) {
     return a;
   }
@@ -1067,32 +1159,32 @@ function T(a) {
   }
   return c;
 }
-;function R(a) {
-  if (!this || this.constructor !== R) {
-    return new R(a);
+;function V(a) {
+  if (!this || this.constructor !== V) {
+    return new V(a);
   }
   const c = a.document || a.doc || a;
   var b;
   this.C = [];
   this.field = [];
   this.J = [];
-  this.key = (b = c.key || c.id) && W(b, this.J) || "id";
+  this.key = (b = c.key || c.id) && La(b, this.J) || "id";
   this.reg = (this.fastupdate = !!a.fastupdate) ? new Map() : new Set();
   this.A = (b = c.store || null) && b && !0 !== b && [];
   this.store = b && new Map();
-  this.cache = (b = a.cache || null) && new X(b);
+  this.cache = (b = a.cache || null) && new Y(b);
   a.cache = !1;
   b = new Map();
   let e = c.index || c.field || c;
-  E(e) && (e = [e]);
+  D(e) && (e = [e]);
   for (let d = 0, f, g; d < e.length; d++) {
-    f = e[d], E(f) || (g = f, f = f.field), g = I(g) ? Object.assign({}, a, g) : a, b.set(f, new Y(g, this.reg)), g.custom ? this.C[d] = g.custom : (this.C[d] = W(f, this.J), g.filter && ("string" === typeof this.C[d] && (this.C[d] = new String(this.C[d])), this.C[d].I = g.filter)), this.field[d] = f;
+    f = e[d], D(f) || (g = f, f = f.field), g = I(g) ? Object.assign({}, a, g) : a, b.set(f, new O(g, this.reg)), g.custom ? this.C[d] = g.custom : (this.C[d] = La(f, this.J), g.filter && ("string" === typeof this.C[d] && (this.C[d] = new String(this.C[d])), this.C[d].I = g.filter)), this.field[d] = f;
   }
   if (this.A) {
     a = c.store;
-    E(a) && (a = [a]);
+    D(a) && (a = [a]);
     for (let d = 0, f, g; d < a.length; d++) {
-      f = a[d], g = f.field || f, f.custom ? (this.A[d] = f.custom, f.custom.U = g) : (this.A[d] = W(g, this.J), f.filter && ("string" === typeof this.A[d] && (this.A[d] = new String(this.A[d])), this.A[d].I = f.filter));
+      f = a[d], g = f.field || f, f.custom ? (this.A[d] = f.custom, f.custom.U = g) : (this.A[d] = La(g, this.J), f.filter && ("string" === typeof this.A[d] && (this.A[d] = new String(this.A[d])), this.A[d].I = f.filter));
     }
   }
   this.index = b;
@@ -1108,14 +1200,14 @@ function T(a) {
         if (!g) {
           throw Error("The tag field from the document descriptor is undefined.");
         }
-        f.custom ? this.B[d] = f.custom : (this.B[d] = W(g, this.J), f.filter && ("string" === typeof this.B[d] && (this.B[d] = new String(this.B[d])), this.B[d].I = f.filter));
+        f.custom ? this.B[d] = f.custom : (this.B[d] = La(g, this.J), f.filter && ("string" === typeof this.B[d] && (this.B[d] = new String(this.B[d])), this.B[d].I = f.filter));
         this.T[d] = g;
         this.tag.set(g, new Map());
       }
     }
   }
 }
-function W(a, c) {
+function La(a, c) {
   const b = a.split(":");
   let e = 0;
   for (let d = 0; d < b.length; d++) {
@@ -1124,7 +1216,7 @@ function W(a, c) {
   e < b.length && (b.length = e);
   return 1 < e ? b : b[0];
 }
-w = R.prototype;
+w = V.prototype;
 w.append = function(a, c) {
   return this.add(a, c, !0);
 };
@@ -1180,7 +1272,7 @@ w.set = function(a, c) {
   this.store.set(a, c);
   return this;
 };
-w.searchCache = Fa;
+w.searchCache = Ma;
 w.export = function(a, c, b = 0, e = 0) {
   if (b < this.field.length) {
     const g = this.field[b];
@@ -1196,17 +1288,17 @@ w.export = function(a, c, b = 0, e = 0) {
   switch(e) {
     case 0:
       d = "reg";
-      f = pa(this.reg);
+      f = sa(this.reg);
       c = null;
       break;
     case 1:
       d = "tag";
-      f = na(this.tag, this.reg.size);
+      f = qa(this.tag, this.reg.size);
       c = null;
       break;
     case 2:
       d = "doc";
-      f = la(this.store);
+      f = oa(this.store);
       c = null;
       break;
     case 3:
@@ -1216,38 +1308,38 @@ w.export = function(a, c, b = 0, e = 0) {
     default:
       return;
   }
-  return Q.call(this, a, c, d, f, b, e);
+  return ua.call(this, a, c, d, f, b, e);
 };
 w.import = function(a, c) {
+  var b = a.split(".");
+  "json" === b[b.length - 1] && b.pop();
+  a = 2 < b.length ? b[0] : "";
+  b = 2 < b.length ? b[2] : b[1];
   if (c) {
     "string" === typeof c && (c = JSON.parse(c));
-    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);
+    if (a) {
+      return this.index.get(a).import(b, c);
     }
-    switch(a) {
+    switch(b) {
       case "reg":
         this.fastupdate = !1;
-        this.reg = qa(c, this.reg);
+        this.reg = ta(c, this.reg);
         for (let e = 0, d; e < this.field.length; e++) {
           d = this.index.get(this.field[e]), d.fastupdate = !1, d.reg = this.reg;
         }
         break;
       case "tag":
-        this.tag = oa(c, this.tag);
+        this.tag = ra(c, this.tag);
         break;
       case "doc":
-        this.store = ma(c, this.store);
+        this.store = pa(c, this.store);
     }
   }
 };
-ia(R.prototype);
-function Fa(a, c, b) {
+ja(V.prototype);
+function Ma(a, c, b) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
-  this.cache || (this.cache = new X());
+  this.cache || (this.cache = new Y());
   let e = this.cache.get(a);
   if (!e) {
     e = this.search(a, c, b);
@@ -1262,56 +1354,56 @@ function Fa(a, c, b) {
   }
   return e;
 }
-function X(a) {
+function Y(a) {
   this.limit = a && !0 !== a ? a : 1000;
   this.cache = new Map();
   this.h = "";
 }
-X.prototype.set = function(a, c) {
+Y.prototype.set = function(a, c) {
   this.cache.set(this.h = a, c);
   this.cache.size > this.limit && this.cache.delete(this.cache.keys().next().value);
 };
-X.prototype.get = function(a) {
+Y.prototype.get = function(a) {
   const c = this.cache.get(a);
   c && this.h !== a && (this.cache.delete(a), this.cache.set(this.h = a, c));
   return c;
 };
-X.prototype.remove = function(a) {
+Y.prototype.remove = function(a) {
   for (const c of this.cache) {
     const b = c[0];
     c[1].includes(a) && this.cache.delete(b);
   }
 };
-X.prototype.clear = function() {
+Y.prototype.clear = function() {
   this.cache.clear();
   this.h = "";
 };
-const Ga = {normalize:function(a) {
+const Na = {normalize:function(a) {
   return a.toLowerCase();
 }};
-const Ha = 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 Ia = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), Ja = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
-const Ka = {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 La = /[\x00-\x7F]+/g;
-const Ma = /[\x00-\x7F]+/g;
-const Na = /[\x00-\x7F]+/g;
-var Oa = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:Ga, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:Ha}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:Ha, matcher:Ia, replacer:Ja}, LatinExtra:{normalize:!0, dedupe:!0, mapper:Ha, replacer:Ja.concat([/(?!^)[aeo]/g, ""]), matcher:Ia}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
+const Oa = new Map([["b", "p"], ["v", "f"], ["w", "f"], ["z", "s"], ["x", "s"], ["d", "t"], ["n", "m"], ["c", "k"], ["g", "k"], ["j", "k"], ["q", "k"], ["i", "e"], ["y", "e"], ["u", "o"]]);
+const Pa = new Map([["ae", "a"], ["oe", "o"], ["sh", "s"], ["kh", "k"], ["th", "t"], ["pf", "f"]]), Qa = [/([^aeo])h(.)/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2", /([^0-9])\1+/g, "$1"];
+const Ra = {a:"", e:"", i:"", o:"", u:"", y:"", b:1, f:1, p:1, v:1, c:2, g:2, j:2, k:2, q:2, s:2, x:2, z:2, "\u00df":2, d:3, t:3, l:4, m:5, n:5, r:6};
+const Sa = /[\x00-\x7F]+/g;
+const Ta = /[\x00-\x7F]+/g;
+const Ua = /[\x00-\x7F]+/g;
+var Va = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:Na, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:Oa}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:Oa, matcher:Pa, replacer:Qa}, LatinExtra:{normalize:!0, dedupe:!0, mapper:Oa, replacer:Qa.concat([/(?!^)[aeo]/g, ""]), matcher:Pa}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
   for (let b = 0; b < a.length; b++) {
     var c = a[b];
-    let e = c.charAt(0), d = Ka[e];
-    for (let f = 1, g; f < c.length && (g = c.charAt(f), "h" === g || "w" === g || !(g = Ka[g]) || g === d || (e += g, d = g, 4 !== e.length)); f++) {
+    let e = c.charAt(0), d = Ra[e];
+    for (let f = 1, g; f < c.length && (g = c.charAt(f), "h" === g || "w" === g || !(g = Ra[g]) || g === d || (e += g, d = g, 4 !== e.length)); f++) {
     }
     a[b] = e;
   }
 }}, ArabicDefault:{rtl:!0, normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(La, " ");
+  return ("" + a).replace(Sa, " ");
 }}, CjkDefault:{normalize:!1, dedupe:!0, split:"", prepare:function(a) {
-  return ("" + a).replace(Ma, "");
+  return ("" + a).replace(Ta, "");
 }}, CyrillicDefault:{normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(Na, " ");
+  return ("" + a).replace(Ua, " ");
 }}};
-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}}};
-Y.prototype.add = function(a, c, b, e) {
+const Xa = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
+O.prototype.add = function(a, c, b, e) {
   if (c && (a || 0 === a)) {
     if (!e && !b && this.reg.has(a)) {
       return this.update(a, c);
@@ -1323,14 +1415,14 @@ Y.prototype.add = function(a, c, b, e) {
         let q = c[this.rtl ? e - 1 - p : p];
         var d = q.length;
         if (d && (n || !m[q])) {
-          var f = this.score ? this.score(c, q, p, null, 0) : Ra(t, e, p), g = "";
+          var f = this.score ? this.score(c, q, p, null, 0) : Ya(t, e, p), g = "";
           switch(this.tokenize) {
             case "full":
               if (2 < d) {
                 for (f = 0; f < d; f++) {
                   for (var k = d; k > f; k--) {
                     g = q.substring(f, k);
-                    var h = this.score ? this.score(c, q, p, g, f) : Ra(t, e, p, d, f);
+                    var h = this.score ? this.score(c, q, p, g, f) : Ya(t, e, p, d, f);
                     Z(this, m, g, h, a, b);
                   }
                 }
@@ -1339,7 +1431,7 @@ Y.prototype.add = function(a, c, b, e) {
             case "reverse":
               if (1 < d) {
                 for (k = d - 1; 0 < k; k--) {
-                  g = q[k] + g, h = this.score ? this.score(c, q, p, g, k) : Ra(t, e, p, d, k), Z(this, m, g, h, a, b);
+                  g = q[k] + g, h = this.score ? this.score(c, q, p, g, k) : Ya(t, e, p, d, k), Z(this, m, g, h, a, b);
                 }
                 g = "";
               }
@@ -1355,7 +1447,7 @@ Y.prototype.add = function(a, c, b, e) {
                 for (d = C(), g = this.S, f = q, k = Math.min(n + 1, e - p), d[f] = 1, h = 1; h < k; h++) {
                   if ((q = c[this.rtl ? e - 1 - p - h : p + h]) && !d[q]) {
                     d[q] = 1;
-                    const y = this.score ? this.score(c, f, p, q, h) : Ra(g + (e / 2 > g ? 0 : 1), e, p, k - 1, h - 1), u = this.bidirectional && q > f;
+                    const y = this.score ? this.score(c, f, p, q, h) : Ya(g + (e / 2 > g ? 0 : 1), e, p, k - 1, h - 1), u = this.bidirectional && q > f;
                     Z(this, l, u ? f : q, y, a, b, u ? q : f);
                   }
                 }
@@ -1374,10 +1466,10 @@ function Z(a, c, b, e, d, f, g) {
     g ? (c = h || (c[b] = C()), c[g] = 1, (h = k.get(g)) ? k = h : k.set(g, k = new Map())) : c[b] = 1, (h = k.get(b)) ? k = h : k.set(b, k = []), k = k[e] || (k[e] = []), f && k.includes(d) || (k.push(d), a.fastupdate && ((c = a.reg.get(d)) ? c.push(k) : a.reg.set(d, [k])));
   }
 }
-function Ra(a, c, b, e, d) {
+function Ya(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;
 }
-;Y.prototype.search = function(a, c, b) {
+;O.prototype.search = function(a, c, b) {
   b || (!c && I(a) ? (b = a, a = "") : I(c) && (b = c, c = 0));
   var e = [], d = 0;
   if (b) {
@@ -1395,11 +1487,11 @@ function Ra(a, c, b, e, d) {
   b = a.length;
   c = c || (k ? 100 : 0);
   if (1 === b) {
-    return g = c, (c = Sa(this, a[0], "")) && c.length ? S.call(this, c, g, d) : [];
+    return g = c, (c = Za(this, a[0], "")) && c.length ? Aa.call(this, c, g, d) : [];
   }
   f = this.depth && !1 !== f;
   if (2 === b && f && !g) {
-    return g = c, (c = Sa(this, a[0], a[1])) && c.length ? S.call(this, c, g, d) : [];
+    return g = c, (c = Za(this, a[0], a[1])) && c.length ? Aa.call(this, c, g, d) : [];
   }
   k = C();
   let l = 0;
@@ -1411,7 +1503,7 @@ function Ra(a, c, b, e, d) {
   for (let q, y; l < b; l++) {
     if ((y = a[l]) && !k[y]) {
       k[y] = 1;
-      q = Sa(this, y, m);
+      q = Za(this, y, m);
       a: {
         f = q;
         var n = e, t = g, p = h;
@@ -1448,22 +1540,22 @@ function Ra(a, c, b, e, d) {
     e = a.length;
     m = a;
     if (1 < e) {
-      m = ta(a, h, c, d, g);
+      m = xa(a, h, c, d, g);
     } else if (1 === e) {
-      g = S.call(null, a[0], c, d);
+      g = Aa.call(null, a[0], c, d);
       break a;
     }
     g = m;
   }
   return g;
 };
-function Sa(a, c, b) {
+function Za(a, c, b) {
   let e;
   b && (e = a.bidirectional && c > b) && (e = b, b = c, c = e);
   a = b ? (a = a.ctx.get(b)) && a.get(c) : a.map.get(c);
   return a;
 }
-;Y.prototype.remove = function(a, c) {
+;O.prototype.remove = function(a, c) {
   const b = this.reg.size && (this.fastupdate ? this.reg.get(a) : this.reg.has(a));
   if (b) {
     if (this.fastupdate) {
@@ -1478,14 +1570,14 @@ function Sa(a, c, b) {
         }
       }
     } else {
-      Ta(this.map, a), this.depth && Ta(this.ctx, a);
+      $a(this.map, a), this.depth && $a(this.ctx, a);
     }
     c || this.reg.delete(a);
   }
   this.cache && this.cache.remove(a);
   return this;
 };
-function Ta(a, c) {
+function $a(a, c) {
   let b = 0;
   if (a.constructor === Array) {
     for (let e = 0, d, f; e < a.length; e++) {
@@ -1500,24 +1592,24 @@ function Ta(a, c) {
     }
   } else {
     for (let e of a.entries()) {
-      const d = e[0], f = Ta(e[1], c);
+      const d = e[0], f = $a(e[1], c);
       f ? b += f : a.delete(d);
     }
   }
   return b;
 }
-;function Y(a, c) {
-  if (!this || this.constructor !== Y) {
-    return new Y(a);
+;function O(a, c) {
+  if (!this || this.constructor !== O) {
+    return new O(a);
   }
   if (a) {
-    var b = E(a) ? a : a.preset;
-    b && (Qa[b] || console.warn("Preset not found: " + b), a = Object.assign({}, Qa[b], a));
+    var b = D(a) ? a : a.preset;
+    b && (Xa[b] || console.warn("Preset not found: " + b), a = Object.assign({}, Xa[b], a));
   } else {
     a = {};
   }
   b = a.context;
-  const e = !0 === b ? {depth:1} : b || {}, d = E(a.encoder) ? Oa[a.encoder] : a.encode || a.encoder || Ga;
+  const e = !0 === b ? {depth:1} : b || {}, d = D(a.encoder) ? Va[a.encoder] : a.encode || a.encoder || Na;
   this.encoder = d.encode ? d : "object" === typeof d ? new K(d) : {encode:d};
   this.resolution = a.resolution || 9;
   this.tokenize = (b = a.tokenize) && "default" !== b && b || "strict";
@@ -1531,10 +1623,10 @@ function Ta(a, c) {
   this.reg = c || (this.fastupdate ? new Map() : new Set());
   this.S = e.resolution || 3;
   this.rtl = d.rtl || a.rtl || !1;
-  this.cache = (b = a.cache || null) && new X(b);
+  this.cache = (b = a.cache || null) && new Y(b);
   this.priority = a.priority || 4;
 }
-w = Y.prototype;
+w = O.prototype;
 w.clear = function() {
   this.map.clear();
   this.ctx.clear();
@@ -1552,7 +1644,7 @@ w.update = function(a, c) {
   const b = this, e = this.remove(a);
   return e && e.then ? e.then(() => b.add(a, c)) : this.add(a, c);
 };
-function Ua(a) {
+function ab(a) {
   let c = 0;
   if (a.constructor === Array) {
     for (let b = 0, e; b < a.length; b++) {
@@ -1560,7 +1652,7 @@ function Ua(a) {
     }
   } else {
     for (const b of a) {
-      const e = b[0], d = Ua(b[1]);
+      const e = b[0], d = ab(b[1]);
       d ? c += d : a.delete(e);
     }
   }
@@ -1570,17 +1662,17 @@ w.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
-  Ua(this.map);
-  this.depth && Ua(this.ctx);
+  ab(this.map);
+  this.depth && ab(this.ctx);
   return this;
 };
-w.searchCache = Fa;
+w.searchCache = Ma;
 w.export = function(a, c, b = 0, e = 0) {
   let d, f;
   switch(e) {
     case 0:
       d = "reg";
-      f = pa(this.reg);
+      f = sa(this.reg);
       break;
     case 1:
       d = "cfg";
@@ -1588,29 +1680,29 @@ w.export = function(a, c, b = 0, e = 0) {
       break;
     case 2:
       d = "map";
-      f = la(this.map, this.reg.size);
+      f = oa(this.map, this.reg.size);
       break;
     case 3:
       d = "ctx";
-      f = na(this.ctx, this.reg.size);
+      f = qa(this.ctx, this.reg.size);
       break;
     default:
       return;
   }
-  return Q.call(this, a, c, d, f, b, e);
+  return ua.call(this, a, c, d, f, b, e);
 };
 w.import = function(a, c) {
   if (c) {
-    switch("string" === typeof c && (c = JSON.parse(c)), a = a.split("."), "json" === a[a.length - 1] && a.pop(), a = 1 < a.length ? a[1] : a[0], a) {
+    switch("string" === typeof c && (c = JSON.parse(c)), a = a.split("."), "json" === a[a.length - 1] && a.pop(), 3 === a.length && a.shift(), a = 1 < a.length ? a[1] : a[0], a) {
       case "reg":
         this.fastupdate = !1;
-        this.reg = qa(c, this.reg);
+        this.reg = ta(c, this.reg);
         break;
       case "map":
-        this.map = ma(c, this.map);
+        this.map = pa(c, this.map);
         break;
       case "ctx":
-        this.ctx = oa(c, this.ctx);
+        this.ctx = ra(c, this.ctx);
     }
   }
 };
@@ -1664,7 +1756,7 @@ w.serialize = function(a = !0) {
   d = "index.ctx=new Map([" + d + "]);";
   return a ? "function inject(index){" + c + e + d + "}" : c + e + d;
 };
-ia(Y.prototype);
-export default {Index:Y, Charset:Oa, Encoder:K, Document:R, Worker:null, Resolver:null, IndexedDB:null, Language:{}};
+ja(O.prototype);
+export default {Index:O, Charset:Va, Encoder:K, Document:V, Worker:null, Resolver:null, IndexedDB:null, Language:{}};
 
-export const Index=Y;export const  Charset=Oa;export const  Encoder=K;export const  Document=R;export const  Worker=null;export const  Resolver=null;export const  IndexedDB=null;export const  Language={};
\ No newline at end of file
+export const Index=O;export const  Charset=Va;export const  Encoder=K;export const  Document=V;export const  Worker=null;export const  Resolver=null;export const  IndexedDB=null;export const  Language={};
\ No newline at end of file
diff --git a/dist/flexsearch.compact.module.min.js b/dist/flexsearch.compact.module.min.js
index b473fb9..270b2ab 100644
--- a/dist/flexsearch.compact.module.min.js
+++ b/dist/flexsearch.compact.module.min.js
@@ -1,12 +1,12 @@
 /**!
- * FlexSearch.js v0.8.111 (Bundle)
+ * FlexSearch.js v0.8.113 (Bundle)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
  * https://github.com/nextapps-de/flexsearch
  */
-var v;function B(a,c,b){const e=typeof b,d=typeof a;if("undefined"!==e){if("undefined"!==d){if(b){if("function"===d&&e===d)return function(k){return a(b(k))};c=a.constructor;if(c===b.constructor){if(c===Array)return b.concat(a);if(c===Map){var f=new Map(b);for(var g of a)f.set(g[0],g[1]);return f}if(c===Set){g=new Set(b);for(f of a.values())g.add(f);return g}}}return a}return b}return"undefined"===d?c:a}function C(){return Object.create(null)}function E(a){return"string"===typeof a}
-function H(a){return"object"===typeof a}function J(a,c){if(E(c))a=a[c];else for(let b=0;a&&b<c.length;b++)a=a[c[b]];return a}function aa(a){let c=0;for(let b=0,e;b<a.length;b++)(e=a[b])&&c<e.length&&(c=e.length);return c};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",
+var v;function B(a,c,b){const e=typeof b,d=typeof a;if("undefined"!==e){if("undefined"!==d){if(b){if("function"===d&&e===d)return function(k){return a(b(k))};c=a.constructor;if(c===b.constructor){if(c===Array)return b.concat(a);if(c===Map){var f=new Map(b);for(var g of a)f.set(g[0],g[1]);return f}if(c===Set){g=new Set(b);for(f of a.values())g.add(f);return g}}}return a}return b}return"undefined"===d?c:a}function C(){return Object.create(null)}function D(a){return"string"===typeof a}
+function H(a){return"object"===typeof a}function I(a,c){if(D(c))a=a[c];else for(let b=0;a&&b<c.length;b++)a=a[c[b]];return a}function aa(a){let c=0;for(let b=0,e;b<a.length;b++)(e=a[b])&&c<e.length&&(c=e.length);return c};var ba=[["\u00aa","a"],["\u00b2","2"],["\u00b3","3"],["\u00b9","1"],["\u00ba","o"],["\u00bc","1\u20444"],["\u00bd","1\u20442"],["\u00be","3\u20444"],["\u00e0","a"],["\u00e1","a"],["\u00e2","a"],["\u00e3","a"],["\u00e4","a"],["\u00e5","a"],["\u00e7","c"],["\u00e8","e"],["\u00e9","e"],["\u00ea","e"],["\u00eb","e"],["\u00ec","i"],["\u00ed","i"],["\u00ee","i"],["\u00ef","i"],["\u00f1","n"],["\u00f2","o"],["\u00f3","o"],["\u00f4","o"],["\u00f5","o"],["\u00f6","o"],["\u00f9","u"],["\u00fa","u"],["\u00fb",
 "u"],["\u00fc","u"],["\u00fd","y"],["\u00ff","y"],["\u0101","a"],["\u0103","a"],["\u0105","a"],["\u0107","c"],["\u0109","c"],["\u010b","c"],["\u010d","c"],["\u010f","d"],["\u0113","e"],["\u0115","e"],["\u0117","e"],["\u0119","e"],["\u011b","e"],["\u011d","g"],["\u011f","g"],["\u0121","g"],["\u0123","g"],["\u0125","h"],["\u0129","i"],["\u012b","i"],["\u012d","i"],["\u012f","i"],["\u0133","ij"],["\u0135","j"],["\u0137","k"],["\u013a","l"],["\u013c","l"],["\u013e","l"],["\u0140","l"],["\u0144","n"],
 ["\u0146","n"],["\u0148","n"],["\u0149","n"],["\u014d","o"],["\u014f","o"],["\u0151","o"],["\u0155","r"],["\u0157","r"],["\u0159","r"],["\u015b","s"],["\u015d","s"],["\u015f","s"],["\u0161","s"],["\u0163","t"],["\u0165","t"],["\u0169","u"],["\u016b","u"],["\u016d","u"],["\u016f","u"],["\u0171","u"],["\u0173","u"],["\u0175","w"],["\u0177","y"],["\u017a","z"],["\u017c","z"],["\u017e","z"],["\u017f","s"],["\u01a1","o"],["\u01b0","u"],["\u01c6","dz"],["\u01c9","lj"],["\u01cc","nj"],["\u01ce","a"],["\u01d0",
 "i"],["\u01d2","o"],["\u01d4","u"],["\u01d6","u"],["\u01d8","u"],["\u01da","u"],["\u01dc","u"],["\u01df","a"],["\u01e1","a"],["\u01e3","ae"],["\u00e6","ae"],["\u01fd","ae"],["\u01e7","g"],["\u01e9","k"],["\u01eb","o"],["\u01ed","o"],["\u01ef","\u0292"],["\u01f0","j"],["\u01f3","dz"],["\u01f5","g"],["\u01f9","n"],["\u01fb","a"],["\u01ff","\u00f8"],["\u0201","a"],["\u0203","a"],["\u0205","e"],["\u0207","e"],["\u0209","i"],["\u020b","i"],["\u020d","o"],["\u020f","o"],["\u0211","r"],["\u0213","r"],["\u0215",
@@ -21,45 +21,50 @@ v.addMatcher=function(a,c){if("object"===typeof a)return this.addReplacer(a,c);i
 v.encode=function(a){if(this.cache&&a.length<=this.K)if(this.H){if(this.F.has(a))return this.F.get(a)}else this.H=setTimeout(L,50,this);this.normalize&&("function"===typeof this.normalize?a=this.normalize(a):a=ha?a.normalize("NFKD").replace(ha,"").toLowerCase():a.toLowerCase());this.prepare&&(a=this.prepare(a));this.numeric&&3<a.length&&(a=a.replace(ea,"$1 $2").replace(fa,"$1 $2").replace(da,"$1 "));const c=!(this.dedupe||this.mapper||this.filter||this.matcher||this.stemmer||this.replacer);let b=
 [],e=this.split||""===this.split?a.split(this.split):a;for(let f=0,g,k;f<e.length;f++)if((g=k=e[f])&&!(g.length<this.minlength))if(c)b.push(g);else if(!this.filter||!this.filter.has(g)){if(this.cache&&g.length<=this.L)if(this.H){var d=this.G.get(g);if(d||""===d){d&&b.push(d);continue}}else this.H=setTimeout(L,50,this);this.stemmer&&2<g.length&&(this.N||(this.N=new RegExp("(?!^)("+this.D+")$")),g=g.replace(this.N,h=>this.stemmer.get(h)),g.length<this.minlength||this.filter&&this.filter.has(g))&&(g=
 "");if(g&&(this.mapper||this.dedupe&&1<g.length)){d="";for(let h=0,l="",m,n;h<g.length;h++)m=g.charAt(h),m===l&&this.dedupe||((n=this.mapper&&this.mapper.get(m))||""===n?n===l&&this.dedupe||!(l=n)||(d+=n):d+=l=m);g=d}this.matcher&&1<g.length&&(this.M||(this.M=new RegExp("("+this.h+")","g")),g=g.replace(this.M,h=>this.matcher.get(h)));if(g&&this.replacer)for(d=0;g&&d<this.replacer.length;d+=2)g=g.replace(this.replacer[d],this.replacer[d+1]);this.cache&&k.length<=this.L&&(this.G.set(k,g),this.G.size>
-this.R&&(this.G.clear(),this.L=this.L/1.1|0));g&&b.push(g)}this.finalize&&(b=this.finalize(b)||b);this.cache&&a.length<=this.K&&(this.F.set(a,b),this.F.size>this.R&&(this.F.clear(),this.K=this.K/1.1|0));return b};function L(a){a.H=null;a.F.clear();a.G.clear()};function ia(a){M.call(a,"add");M.call(a,"append");M.call(a,"search");M.call(a,"update");M.call(a,"remove")}let N,ja;const O={},P={};function ka(a){N=0;O[a]=P[a]}
-function M(a){this[a+"Async"]=function(){const c=arguments;var b=c[c.length-1];let e;"function"===typeof b&&(e=b,delete c[c.length-1]);N||(N=setTimeout(ka,0,a),ja=Date.now());P[a]||(P[a]=O[a]=1E3);if(!--O[a]){O[a]=P[a]=P[a]*this.priority*this.priority*3/(Date.now()-ja)|0||1;N=clearTimeout(N);const f=this;return new Promise(g=>{setTimeout(function(){g(f[a+"Async"].apply(f,c))},0)})}const d=this[a].apply(this,c);b=d.then?d:new Promise(f=>f(d));e&&b.then(e);return b}};function la(a,c=0){let b=[],e=[];c&&(c=25E4/c*5E3|0);for(const d of a.entries())e.push(d),e.length===c&&(b.push(e),e=[]);e.length&&b.push(e);return b}function ma(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 na(a,c=0){let b=[],e=[];c&&(c=25E4/c*1E3|0);for(const d of a.entries())e.push([d[0],la(d[1])[0]]),e.length===c&&(b.push(e),e=[]);e.length&&b.push(e);return b}
-function oa(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],ma(e[1],d));return c}function pa(a){let c=[],b=[];for(const e of a.keys())b.push(e),25E4===b.length&&(c.push(b),b=[]);b.length&&c.push(b);return c}function qa(a,c){c||(c=new Set);for(let b=0;b<a.length;b++)c.add(a[b]);return c}
-function Q(a,c,b,e,d,f,g=0){const k=e&&e.constructor===Array;var h=k?e.shift():e;if(!h)return this.export(a,c,d,f+1);if((h=a((c?c+".":"")+(g+1)+"."+b,JSON.stringify(h)))&&h.then){const l=this;return h.then(function(){return Q.call(l,a,c,b,k?e:null,d,f,g+1)})}return Q.call(this,a,c,b,k?e:null,d,f,g+1)};R.prototype.add=function(a,c,b){H(a)&&(c=a,a=J(c,this.key));if(c&&(a||0===a)){if(!b&&this.reg.has(a))return this.update(a,c);for(let k=0,h;k<this.field.length;k++){h=this.C[k];var e=this.index.get(this.field[k]);if("function"===typeof h){var d=h(c);d&&e.add(a,d,!1,!0)}else if(d=h.I,!d||d(c))h.constructor===String?h=[""+h]:E(h)&&(h=[h]),ra(c,h,this.J,0,e,a,h[0],b)}if(this.tag)for(e=0;e<this.B.length;e++){var f=this.B[e];d=this.tag.get(this.T[e]);let k=C();if("function"===typeof f){if(f=f(c),!f)continue}else{var g=
-f.I;if(g&&!g(c))continue;f.constructor===String&&(f=""+f);f=J(c,f)}if(d&&f){E(f)&&(f=[f]);for(let h=0,l,m;h<f.length;h++)l=f[h],k[l]||(k[l]=1,(g=d.get(l))?m=g:d.set(l,m=[]),b&&m.includes(a)||(m.push(a),this.fastupdate&&((g=this.reg.get(a))?g.push(m):this.reg.set(a,[m]))))}}if(this.store&&(!b||!this.store.has(a))){let k;if(this.A){k=C();for(let h=0,l;h<this.A.length;h++){l=this.A[h];if((b=l.I)&&!b(c))continue;let m;if("function"===typeof l){m=l(c);if(!m)continue;l=[l.U]}else if(E(l)||l.constructor===
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+g||"w"===g||!(g=Ra[g])||g===d||(e+=g,d=g,4!==e.length));f++);a[b]=e}}},ArabicDefault:{rtl:!0,normalize:!1,dedupe:!0,prepare:function(a){return(""+a).replace(Sa," ")}},CjkDefault:{normalize:!1,dedupe:!0,split:"",prepare:function(a){return(""+a).replace(Ta,"")}},CyrillicDefault:{normalize:!1,dedupe:!0,prepare:function(a){return(""+a).replace(Ua," ")}}};const Xa={memory:{resolution:1},performance:{resolution:6,fastupdate:!0,context:{depth:1,resolution:3}},match:{tokenize:"forward"},score:{resolution:9,context:{depth:2,resolution:9}}};O.prototype.add=function(a,c,b,e){if(c&&(a||0===a)){if(!e&&!b&&this.reg.has(a))return this.update(a,c);c=this.encoder.encode(c);if(e=c.length){const l=C(),m=C(),n=this.depth,t=this.resolution;for(let p=0;p<e;p++){let q=c[this.rtl?e-1-p:p];var d=q.length;if(d&&(n||!m[q])){var f=this.score?this.score(c,q,p,null,0):Ya(t,e,p),g="";switch(this.tokenize){case "full":if(2<d){for(f=0;f<d;f++)for(var k=d;k>f;k--){g=q.substring(f,k);var h=this.score?this.score(c,q,p,g,f):Ya(t,e,p,d,f);Z(this,m,g,h,a,b)}break}case "reverse":if(1<
+d){for(k=d-1;0<k;k--)g=q[k]+g,h=this.score?this.score(c,q,p,g,k):Ya(t,e,p,d,k),Z(this,m,g,h,a,b);g=""}case "forward":if(1<d){for(k=0;k<d;k++)g+=q[k],Z(this,m,g,f,a,b);break}default:if(Z(this,m,q,f,a,b),n&&1<e&&p<e-1)for(d=C(),g=this.S,f=q,k=Math.min(n+1,e-p),d[f]=1,h=1;h<k;h++)if((q=c[this.rtl?e-1-p-h:p+h])&&!d[q]){d[q]=1;const y=this.score?this.score(c,f,p,q,h):Ya(g+(e/2>g?0:1),e,p,k-1,h-1),w=this.bidirectional&&q>f;Z(this,l,w?f:q,y,a,b,w?q:f)}}}}this.fastupdate||this.reg.add(a)}}return this};
+function Z(a,c,b,e,d,f,g){let k=g?a.ctx:a.map,h;if(!c[b]||g&&!(h=c[b])[g])g?(c=h||(c[b]=C()),c[g]=1,(h=k.get(g))?k=h:k.set(g,k=new Map)):c[b]=1,(h=k.get(b))?k=h:k.set(b,k=[]),k=k[e]||(k[e]=[]),f&&k.includes(d)||(k.push(d),a.fastupdate&&((c=a.reg.get(d))?c.push(k):a.reg.set(d,[k])))}function Ya(a,c,b,e,d){return b&&1<a?c+(e||0)<=a?b+(d||0):(a-1)/(c+(e||0))*(b+(d||0))+1|0:0};O.prototype.search=function(a,c,b){b||(!c&&H(a)?(b=a,a=""):H(c)&&(b=c,c=0));var e=[],d=0;if(b){a=b.query||a;c=b.limit||c;d=b.offset||0;var f=b.context;var g=b.suggest;var k=!0;var h=b.resolution}else k=!0;a=this.encoder.encode(a);b=a.length;c=c||(k?100:0);if(1===b)return g=c,(c=Za(this,a[0],""))&&c.length?Aa.call(this,c,g,d):[];f=this.depth&&!1!==f;if(2===b&&f&&!g)return g=c,(c=Za(this,a[0],a[1]))&&c.length?Aa.call(this,c,g,d):[];k=C();let l=0;if(1<b&&f){var m=a[0];l=1}h||0===h||(h=m?this.S:this.resolution);
+for(let q,y;l<b;l++){if((y=a[l])&&!k[y]){k[y]=1;q=Za(this,y,m);a:{f=q;var n=e,t=g,p=h;let w=[];if(f&&f.length){if(f.length<=p){n.push(f);q=void 0;break a}for(let u=0,z;u<p;u++)if(z=f[u])w[u]=z;if(w.length){n.push(w);q=void 0;break a}}q=t?void 0:w}if(q){e=q;break}m&&(g&&q&&e.length||(m=y))}g&&m&&l===b-1&&!e.length&&(m="",l=-1,k=C())}a:{a=e;e=a.length;m=a;if(1<e)m=xa(a,h,c,d,g);else if(1===e){g=Aa.call(null,a[0],c,d);break a}g=m}return g};
+function Za(a,c,b){let e;b&&(e=a.bidirectional&&c>b)&&(e=b,b=c,c=e);a=b?(a=a.ctx.get(b))&&a.get(c):a.map.get(c);return a};O.prototype.remove=function(a,c){const b=this.reg.size&&(this.fastupdate?this.reg.get(a):this.reg.has(a));if(b){if(this.fastupdate)for(let e=0,d;e<b.length;e++){if(d=b[e])if(2>d.length)d.pop();else{const f=d.indexOf(a);f===b.length-1?d.pop():d.splice(f,1)}}else $a(this.map,a),this.depth&&$a(this.ctx,a);c||this.reg.delete(a)}this.cache&&this.cache.remove(a);return this};
+function $a(a,c){let b=0;if(a.constructor===Array)for(let e=0,d,f;e<a.length;e++){if((d=a[e])&&d.length)if(f=d.indexOf(c),0<=f){1<d.length?(d.splice(f,1),b++):delete a[e];break}else b++}else for(let e of a.entries()){const d=e[0],f=$a(e[1],c);f?b+=f:a.delete(d)}return b};function O(a,c){if(!this||this.constructor!==O)return new O(a);if(a){var b=D(a)?a:a.preset;b&&(a=Object.assign({},Xa[b],a))}else a={};b=a.context;const e=!0===b?{depth:1}:b||{},d=D(a.encoder)?Wa[a.encoder]:a.encode||a.encoder||Na;this.encoder=d.encode?d:"object"===typeof d?new K(d):{encode:d};this.resolution=a.resolution||9;this.tokenize=(b=a.tokenize)&&"default"!==b&&b||"strict";this.depth="strict"===b&&e.depth||0;this.bidirectional=!1!==e.bidirectional;this.fastupdate=!!a.fastupdate;this.score=
+a.score||null;b=!1;this.map=new Map;this.ctx=new Map;this.reg=c||(this.fastupdate?new Map:new Set);this.S=e.resolution||3;this.rtl=d.rtl||a.rtl||!1;this.cache=(b=a.cache||null)&&new Y(b);this.priority=a.priority||4}v=O.prototype;v.clear=function(){this.map.clear();this.ctx.clear();this.reg.clear();this.cache&&this.cache.clear();return this};v.append=function(a,c){return this.add(a,c,!0)};v.contain=function(a){return this.reg.has(a)};
+v.update=function(a,c){const b=this,e=this.remove(a);return e&&e.then?e.then(()=>b.add(a,c)):this.add(a,c)};function ab(a){let c=0;if(a.constructor===Array)for(let b=0,e;b<a.length;b++)(e=a[b])&&(c+=e.length);else for(const b of a){const e=b[0],d=ab(b[1]);d?c+=d:a.delete(e)}return c}v.cleanup=function(){if(!this.fastupdate)return this;ab(this.map);this.depth&&ab(this.ctx);return this};v.searchCache=Ma;
+v.export=function(a,c,b=0,e=0){let d,f;switch(e){case 0:d="reg";f=sa(this.reg);break;case 1:d="cfg";f=null;break;case 2:d="map";f=oa(this.map,this.reg.size);break;case 3:d="ctx";f=qa(this.ctx,this.reg.size);break;default:return}return ua.call(this,a,c,d,f,b,e)};
+v.import=function(a,c){if(c)switch("string"===typeof c&&(c=JSON.parse(c)),a=a.split("."),"json"===a[a.length-1]&&a.pop(),3===a.length&&a.shift(),a=1<a.length?a[1]:a[0],a){case "reg":this.fastupdate=!1;this.reg=ta(c,this.reg);break;case "map":this.map=pa(c,this.map);break;case "ctx":this.ctx=ra(c,this.ctx)}};
 v.serialize=function(a=!0){if(!this.reg.size)return"";let c="",b="";for(var e of this.reg.keys())b||(b=typeof e),c+=(c?",":"")+("string"===b?'"'+e+'"':e);c="index.reg=new Set(["+c+"]);";e="";for(var d of this.map.entries()){var f=d[0],g=d[1],k="";for(let m=0,n;m<g.length;m++){n=g[m]||[""];var h="";for(var l=0;l<n.length;l++)h+=(h?",":"")+("string"===b?'"'+n[l]+'"':n[l]);h="["+h+"]";k+=(k?",":"")+h}k='["'+f+'",['+k+"]]";e+=(e?",":"")+k}e="index.map=new Map(["+e+"]);";d="";for(const m of this.ctx.entries()){f=
-m[0];g=m[1];for(const n of g.entries()){g=n[0];k=n[1];h="";for(let t=0,p;t<k.length;t++){p=k[t]||[""];l="";for(let q=0;q<p.length;q++)l+=(l?",":"")+("string"===b?'"'+p[q]+'"':p[q]);l="["+l+"]";h+=(h?",":"")+l}h='new Map([["'+g+'",['+h+"]]])";h='["'+f+'",'+h+"]";d+=(d?",":"")+h}}d="index.ctx=new Map(["+d+"]);";return a?"function inject(index){"+c+e+d+"}":c+e+d};ia(Y.prototype);export default {Index:Y,Charset:Pa,Encoder:K,Document:R,Worker:null,Resolver:null,IndexedDB:null,Language:{}};
-export const Index=Y;export const Charset=Pa;export const Encoder=K;export const Document=R;export const Worker=null;export const Resolver=null;export const IndexedDB=null;export const Language={};
\ No newline at end of file
+m[0];g=m[1];for(const n of g.entries()){g=n[0];k=n[1];h="";for(let t=0,p;t<k.length;t++){p=k[t]||[""];l="";for(let q=0;q<p.length;q++)l+=(l?",":"")+("string"===b?'"'+p[q]+'"':p[q]);l="["+l+"]";h+=(h?",":"")+l}h='new Map([["'+g+'",['+h+"]]])";h='["'+f+'",'+h+"]";d+=(d?",":"")+h}}d="index.ctx=new Map(["+d+"]);";return a?"function inject(index){"+c+e+d+"}":c+e+d};ja(O.prototype);export default {Index:O,Charset:Wa,Encoder:K,Document:V,Worker:null,Resolver:null,IndexedDB:null,Language:{}};
+export const Index=O;export const Charset=Wa;export const Encoder=K;export const Document=V;export const Worker=null;export const Resolver=null;export const IndexedDB=null;export const Language={};
\ No newline at end of file
diff --git a/dist/flexsearch.es5.debug.js b/dist/flexsearch.es5.debug.js
index 34deec9..b3e5474 100644
--- a/dist/flexsearch.es5.debug.js
+++ b/dist/flexsearch.es5.debug.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.111 (ES5/Debug)
+ * FlexSearch.js v0.8.113 (ES5/Debug)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -137,12 +137,12 @@ function oa(a, b, c, d) {
     if (!e.done) {
       return a.h.C = !1, e;
     }
-    var g = e.value;
-  } catch (f) {
-    return a.h.A = null, la(a.h, f), pa(a);
+    var f = e.value;
+  } catch (g) {
+    return a.h.A = null, la(a.h, g), pa(a);
   }
   a.h.A = null;
-  d.call(a.h, g);
+  d.call(a.h, f);
   return pa(a);
 }
 function pa(a) {
@@ -198,25 +198,25 @@ function sa(a) {
     return a.throw(d);
   }
   return new Promise(function(d, e) {
-    function g(f) {
-      f.done ? d(f.value) : Promise.resolve(f.value).then(b, c).then(g, e);
+    function f(g) {
+      g.done ? d(g.value) : Promise.resolve(g.value).then(b, c).then(f, e);
     }
-    g(a.next());
+    f(a.next());
   });
 }
 function ta(a) {
   return sa(new qa(new ma(a)));
 }
 C("Symbol", function(a) {
-  function b(g) {
+  function b(f) {
     if (this instanceof b) {
       throw new TypeError("Symbol is not a constructor");
     }
-    return new c(d + (g || "") + "_" + e++, g);
+    return new c(d + (f || "") + "_" + e++, f);
   }
-  function c(g, f) {
-    this.h = g;
-    ba(this, "description", {configurable:!0, writable:!0, value:f});
+  function c(f, g) {
+    this.h = f;
+    ba(this, "description", {configurable:!0, writable:!0, value:g});
   }
   if (a) {
     return a;
@@ -248,14 +248,14 @@ function ua(a) {
   return a;
 }
 C("Promise", function(a) {
-  function b(f) {
+  function b(g) {
     this.A = 0;
     this.B = void 0;
     this.h = [];
     this.H = !1;
     var h = this.C();
     try {
-      f(h.resolve, h.reject);
+      g(h.resolve, h.reject);
     } catch (k) {
       h.reject(k);
     }
@@ -263,15 +263,15 @@ C("Promise", function(a) {
   function c() {
     this.h = null;
   }
-  function d(f) {
-    return f instanceof b ? f : new b(function(h) {
-      h(f);
+  function d(g) {
+    return g instanceof b ? g : new b(function(h) {
+      h(g);
     });
   }
   if (a) {
     return a;
   }
-  c.prototype.A = function(f) {
+  c.prototype.A = function(g) {
     if (null == this.h) {
       this.h = [];
       var h = this;
@@ -279,19 +279,19 @@ C("Promise", function(a) {
         h.D();
       });
     }
-    this.h.push(f);
+    this.h.push(g);
   };
   var e = B.setTimeout;
-  c.prototype.B = function(f) {
-    e(f, 0);
+  c.prototype.B = function(g) {
+    e(g, 0);
   };
   c.prototype.D = function() {
     for (; this.h && this.h.length;) {
-      var f = this.h;
+      var g = this.h;
       this.h = [];
-      for (var h = 0; h < f.length; ++h) {
-        var k = f[h];
-        f[h] = null;
+      for (var h = 0; h < g.length; ++h) {
+        var k = g[h];
+        g[h] = null;
         try {
           k();
         } catch (l) {
@@ -301,31 +301,31 @@ C("Promise", function(a) {
     }
     this.h = null;
   };
-  c.prototype.C = function(f) {
+  c.prototype.C = function(g) {
     this.B(function() {
-      throw f;
+      throw g;
     });
   };
   b.prototype.C = function() {
-    function f(l) {
+    function g(l) {
       return function(m) {
         k || (k = !0, l.call(h, m));
       };
     }
     var h = this, k = !1;
-    return {resolve:f(this.fa), reject:f(this.D)};
+    return {resolve:g(this.fa), reject:g(this.D)};
   };
-  b.prototype.fa = function(f) {
-    if (f === this) {
+  b.prototype.fa = function(g) {
+    if (g === this) {
       this.D(new TypeError("A Promise cannot resolve to itself"));
     } else {
-      if (f instanceof b) {
-        this.ha(f);
+      if (g instanceof b) {
+        this.ha(g);
       } else {
         a: {
-          switch(typeof f) {
+          switch(typeof g) {
             case "object":
-              var h = null != f;
+              var h = null != g;
               break a;
             case "function":
               h = !0;
@@ -334,41 +334,41 @@ C("Promise", function(a) {
               h = !1;
           }
         }
-        h ? this.ea(f) : this.G(f);
+        h ? this.ea(g) : this.G(g);
       }
     }
   };
-  b.prototype.ea = function(f) {
+  b.prototype.ea = function(g) {
     var h = void 0;
     try {
-      h = f.then;
+      h = g.then;
     } catch (k) {
       this.D(k);
       return;
     }
-    "function" == typeof h ? this.ia(h, f) : this.G(f);
+    "function" == typeof h ? this.ia(h, g) : this.G(g);
   };
-  b.prototype.D = function(f) {
-    this.M(2, f);
+  b.prototype.D = function(g) {
+    this.M(2, g);
   };
-  b.prototype.G = function(f) {
-    this.M(1, f);
+  b.prototype.G = function(g) {
+    this.M(1, g);
   };
-  b.prototype.M = function(f, h) {
+  b.prototype.M = function(g, h) {
     if (0 != this.A) {
-      throw Error("Cannot settle(" + f + ", " + h + "): Promise already settled in state" + this.A);
+      throw Error("Cannot settle(" + g + ", " + h + "): Promise already settled in state" + this.A);
     }
-    this.A = f;
+    this.A = g;
     this.B = h;
     2 === this.A && this.ga();
     this.N();
   };
   b.prototype.ga = function() {
-    var f = this;
+    var g = this;
     e(function() {
-      if (f.T()) {
+      if (g.T()) {
         var h = B.console;
-        "undefined" !== typeof h && h.error(f.B);
+        "undefined" !== typeof h && h.error(g.B);
       }
     }, 1);
   };
@@ -376,37 +376,37 @@ C("Promise", function(a) {
     if (this.H) {
       return !1;
     }
-    var f = B.CustomEvent, h = B.Event, k = B.dispatchEvent;
+    var g = B.CustomEvent, h = B.Event, k = B.dispatchEvent;
     if ("undefined" === typeof k) {
       return !0;
     }
-    "function" === typeof f ? f = new f("unhandledrejection", {cancelable:!0}) : "function" === typeof h ? f = new h("unhandledrejection", {cancelable:!0}) : (f = B.document.createEvent("CustomEvent"), f.initCustomEvent("unhandledrejection", !1, !0, f));
-    f.promise = this;
-    f.reason = this.B;
-    return k(f);
+    "function" === typeof g ? g = new g("unhandledrejection", {cancelable:!0}) : "function" === typeof h ? g = new h("unhandledrejection", {cancelable:!0}) : (g = B.document.createEvent("CustomEvent"), g.initCustomEvent("unhandledrejection", !1, !0, g));
+    g.promise = this;
+    g.reason = this.B;
+    return k(g);
   };
   b.prototype.N = function() {
     if (null != this.h) {
-      for (var f = 0; f < this.h.length; ++f) {
-        g.A(this.h[f]);
+      for (var g = 0; g < this.h.length; ++g) {
+        f.A(this.h[g]);
       }
       this.h = null;
     }
   };
-  var g = new c();
-  b.prototype.ha = function(f) {
+  var f = new c();
+  b.prototype.ha = function(g) {
     var h = this.C();
-    f.U(h.resolve, h.reject);
+    g.U(h.resolve, h.reject);
   };
-  b.prototype.ia = function(f, h) {
+  b.prototype.ia = function(g, h) {
     var k = this.C();
     try {
-      f.call(h, k.resolve, k.reject);
+      g.call(h, k.resolve, k.reject);
     } catch (l) {
       k.reject(l);
     }
   };
-  b.prototype.then = function(f, h) {
+  b.prototype.then = function(g, h) {
     function k(p, q) {
       return "function" == typeof p ? function(t) {
         try {
@@ -420,17 +420,17 @@ C("Promise", function(a) {
       l = p;
       m = q;
     });
-    this.U(k(f, l), k(h, m));
+    this.U(k(g, l), k(h, m));
     return n;
   };
-  b.prototype.catch = function(f) {
-    return this.then(void 0, f);
+  b.prototype.catch = function(g) {
+    return this.then(void 0, g);
   };
-  b.prototype.U = function(f, h) {
+  b.prototype.U = function(g, h) {
     function k() {
       switch(l.A) {
         case 1:
-          f(l.B);
+          g(l.B);
           break;
         case 2:
           h(l.B);
@@ -440,24 +440,24 @@ C("Promise", function(a) {
       }
     }
     var l = this;
-    null == this.h ? g.A(k) : this.h.push(k);
+    null == this.h ? f.A(k) : this.h.push(k);
     this.H = !0;
   };
   b.resolve = d;
-  b.reject = function(f) {
+  b.reject = function(g) {
     return new b(function(h, k) {
-      k(f);
+      k(g);
     });
   };
-  b.race = function(f) {
+  b.race = function(g) {
     return new b(function(h, k) {
-      for (var l = w(f), m = l.next(); !m.done; m = l.next()) {
+      for (var l = w(g), m = l.next(); !m.done; m = l.next()) {
         d(m.value).U(h, k);
       }
     });
   };
-  b.all = function(f) {
-    var h = w(f), k = h.next();
+  b.all = function(g) {
+    var h = w(g), k = h.next();
     return k.done ? d([]) : new b(function(l, m) {
       function n(t) {
         return function(x) {
@@ -478,8 +478,8 @@ function va(a, b) {
   a instanceof String && (a += "");
   var c = 0, d = !1, e = {next:function() {
     if (!d && c < a.length) {
-      var g = c++;
-      return {value:b(g, a[g]), done:!1};
+      var f = c++;
+      return {value:b(f, a[f]), done:!1};
     }
     d = !0;
     return {done:!0, value:void 0};
@@ -516,12 +516,12 @@ C("WeakMap", function(a) {
     return "object" === l && null !== k || "function" === l;
   }
   function e(k) {
-    if (!F(k, f)) {
+    if (!F(k, g)) {
       var l = new c();
-      ba(k, f, {value:l});
+      ba(k, g, {value:l});
     }
   }
-  function g(k) {
+  function f(k) {
     var l = Object[k];
     l && (Object[k] = function(m) {
       if (m instanceof c) {
@@ -549,30 +549,30 @@ C("WeakMap", function(a) {
   }()) {
     return a;
   }
-  var f = "$jscomp_hidden_" + Math.random();
-  g("freeze");
-  g("preventExtensions");
-  g("seal");
+  var g = "$jscomp_hidden_" + Math.random();
+  f("freeze");
+  f("preventExtensions");
+  f("seal");
   var h = 0;
   b.prototype.set = function(k, l) {
     if (!d(k)) {
       throw Error("Invalid WeakMap key");
     }
     e(k);
-    if (!F(k, f)) {
+    if (!F(k, g)) {
       throw Error("WeakMap key fail: " + k);
     }
-    k[f][this.h] = l;
+    k[g][this.h] = l;
     return this;
   };
   b.prototype.get = function(k) {
-    return d(k) && F(k, f) ? k[f][this.h] : void 0;
+    return d(k) && F(k, g) ? k[g][this.h] : void 0;
   };
   b.prototype.has = function(k) {
-    return d(k) && F(k, f) && F(k[f], this.h);
+    return d(k) && F(k, g) && F(k[g], this.h);
   };
   b.prototype.delete = function(k) {
-    return d(k) && F(k, f) && F(k[f], this.h) ? delete k[f][this.h] : !1;
+    return d(k) && F(k, g) && F(k[g], this.h) ? delete k[g][this.h] : !1;
   };
   return b;
 });
@@ -598,7 +598,7 @@ C("Map", function(a) {
   }
   function d(h, k) {
     var l = k && typeof k;
-    "object" == l || "function" == l ? g.has(k) ? l = g.get(k) : (l = "" + ++f, g.set(k, l)) : l = "p_" + k;
+    "object" == l || "function" == l ? f.has(k) ? l = f.get(k) : (l = "" + ++g, f.set(k, l)) : l = "p_" + k;
     var m = h[0][l];
     if (m && F(h[0], l)) {
       for (h = 0; h < m.length; h++) {
@@ -642,7 +642,7 @@ C("Map", function(a) {
   }()) {
     return a;
   }
-  var g = new WeakMap();
+  var f = new WeakMap();
   e.prototype.set = function(h, k) {
     h = 0 === h ? 0 : h;
     var l = d(this, h);
@@ -686,7 +686,7 @@ C("Map", function(a) {
     }
   };
   e.prototype[Symbol.iterator] = e.prototype.entries;
-  var f = 0;
+  var g = 0;
   return e;
 });
 C("Array.prototype.keys", function(a) {
@@ -716,13 +716,13 @@ C("Set", function(a) {
       if (!d.has(c) || 1 != d.size || d.add(c) != d || 1 != d.size || d.add({x:4}) != d || 2 != d.size) {
         return !1;
       }
-      var e = d.entries(), g = e.next();
-      if (g.done || g.value[0] != c || g.value[1] != c) {
+      var e = d.entries(), f = e.next();
+      if (f.done || f.value[0] != c || f.value[1] != c) {
         return !1;
       }
-      g = e.next();
-      return g.done || g.value[0] == c || 4 != g.value[0].x || g.value[1] != g.value[0] ? !1 : e.next().done;
-    } catch (f) {
+      f = e.next();
+      return f.done || f.value[0] == c || 4 != f.value[0].x || f.value[1] != f.value[0] ? !1 : e.next().done;
+    } catch (g) {
       return !1;
     }
   }()) {
@@ -756,8 +756,8 @@ C("Set", function(a) {
   b.prototype[Symbol.iterator] = b.prototype.values;
   b.prototype.forEach = function(c, d) {
     var e = this;
-    this.h.forEach(function(g) {
-      return c.call(d, g, g, e);
+    this.h.forEach(function(f) {
+      return c.call(d, f, f, e);
     });
   };
   return b;
@@ -781,8 +781,8 @@ C("Array.prototype.includes", function(a) {
     var e = d.length;
     c = c || 0;
     for (0 > c && (c = Math.max(c + e, 0)); c < e; c++) {
-      var g = d[c];
-      if (g === b || Object.is(g, b)) {
+      var f = d[c];
+      if (f === b || Object.is(f, b)) {
         return !0;
       }
     }
@@ -830,8 +830,8 @@ function I(a, b, c) {
     if ("undefined" !== e) {
       if (c) {
         if ("function" === e && d === e) {
-          return function(g) {
-            return a(c(g));
+          return function(f) {
+            return a(c(f));
           };
         }
         b = a.constructor;
@@ -909,15 +909,15 @@ function Ga(a) {
   if (!this || this.constructor !== Ga) {
     var b = Function.prototype.bind, c = b.apply, d = [null], e = d.concat;
     if (arguments instanceof Array) {
-      var g = arguments;
+      var f = arguments;
     } else {
-      g = w(arguments);
-      for (var f, h = []; !(f = g.next()).done;) {
-        h.push(f.value);
+      f = w(arguments);
+      for (var g, h = []; !(g = f.next()).done;) {
+        h.push(g.value);
       }
-      g = h;
+      f = h;
     }
-    return new (c.call(b, Ga, e.call(d, g)))();
+    return new (c.call(b, Ga, e.call(d, f)))();
   }
   for (b = 0; b < arguments.length; b++) {
     this.assign(arguments[b]);
@@ -942,7 +942,7 @@ u.assign = function(a) {
       }
       try {
         this.split = new RegExp("[" + (b ? "^" : "") + d + "]+", "u");
-      } catch (g) {
+      } catch (f) {
         console.error("Your split configuration:", c, "is not supported on this platform. It falls back to using simple whitespace splitter instead: /s+/."), this.split = /\s+/;
       }
     } else {
@@ -952,7 +952,7 @@ u.assign = function(a) {
   } else {
     try {
       this.split = I(this.split, Ba);
-    } catch (g) {
+    } catch (f) {
       console.warn("This platform does not support unicode regex. It falls back to using simple whitespace splitter instead: /s+/."), this.split = /\s+/;
     }
     this.numeric = I(a.numeric, I(this.numeric, !0));
@@ -1051,15 +1051,15 @@ u.encode = function(a) {
   this.normalize && ("function" === typeof this.normalize ? a = this.normalize(a) : a = Fa ? a.normalize("NFKD").replace(Fa, "").toLowerCase() : a.toLowerCase());
   this.prepare && (a = this.prepare(a));
   this.numeric && 3 < a.length && (a = a.replace(Da, "$1 $2").replace(Ea, "$1 $2").replace(Ca, "$1 "));
-  for (var c = !(this.dedupe || this.mapper || this.filter || this.matcher || this.stemmer || this.replacer), d = [], e = this.split || "" === this.split ? a.split(this.split) : a, g = 0, f = void 0, h = void 0; g < e.length; g++) {
-    if ((f = h = e[g]) && !(f.length < this.minlength)) {
+  for (var c = !(this.dedupe || this.mapper || this.filter || this.matcher || this.stemmer || this.replacer), d = [], e = this.split || "" === this.split ? a.split(this.split) : a, f = 0, g = void 0, h = void 0; f < e.length; f++) {
+    if ((g = h = e[f]) && !(g.length < this.minlength)) {
       if (c) {
-        d.push(f);
+        d.push(g);
       } else {
-        if (!this.filter || !this.filter.has(f)) {
-          if (this.cache && f.length <= this.H) {
+        if (!this.filter || !this.filter.has(g)) {
+          if (this.cache && g.length <= this.H) {
             if (this.D) {
-              var k = this.C.get(f);
+              var k = this.C.get(g);
               if (k || "" === k) {
                 k && d.push(k);
                 continue;
@@ -1068,26 +1068,26 @@ u.encode = function(a) {
               this.D = setTimeout(N, 50, this);
             }
           }
-          this.stemmer && 2 < f.length && (this.N || (this.N = new RegExp("(?!^)(" + this.A + ")$")), f = f.replace(this.N, function(q) {
+          this.stemmer && 2 < g.length && (this.N || (this.N = new RegExp("(?!^)(" + this.A + ")$")), g = g.replace(this.N, function(q) {
             return b.stemmer.get(q);
-          }), f.length < this.minlength || this.filter && this.filter.has(f)) && (f = "");
-          if (f && (this.mapper || this.dedupe && 1 < f.length)) {
+          }), g.length < this.minlength || this.filter && this.filter.has(g)) && (g = "");
+          if (g && (this.mapper || this.dedupe && 1 < g.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);
+            for (var l = 0, m = "", n = void 0, p = void 0; l < g.length; l++) {
+              n = g.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;
+            g = k;
           }
-          this.matcher && 1 < f.length && (this.M || (this.M = new RegExp("(" + this.h + ")", "g")), f = f.replace(this.M, function(q) {
+          this.matcher && 1 < g.length && (this.M || (this.M = new RegExp("(" + this.h + ")", "g")), g = g.replace(this.M, function(q) {
             return b.matcher.get(q);
           }));
-          if (f && this.replacer) {
-            for (k = 0; f && k < this.replacer.length; k += 2) {
-              f = f.replace(this.replacer[k], this.replacer[k + 1]);
+          if (g && this.replacer) {
+            for (k = 0; g && k < this.replacer.length; k += 2) {
+              g = g.replace(this.replacer[k], this.replacer[k + 1]);
             }
           }
-          this.cache && h.length <= this.H && (this.C.set(h, f), this.C.size > this.T && (this.C.clear(), this.H = this.H / 1.1 | 0));
-          f && d.push(f);
+          this.cache && h.length <= this.H && (this.C.set(h, g), this.C.size > this.T && (this.C.clear(), this.H = this.H / 1.1 | 0));
+          g && d.push(g);
         }
       }
     }
@@ -1103,9 +1103,9 @@ function N(a) {
 }
 ;var O, P;
 function Ha(a) {
-  var b, c, d, e, g;
-  return ta(function(f) {
-    switch(f.h) {
+  var b, c, d, e, f, g;
+  return ta(function(h) {
+    switch(h.h) {
       case 1:
         a = a.data;
         b = a.task;
@@ -1118,51 +1118,57 @@ function Ha(a) {
             postMessage({id:c});
             break;
           default:
-            f.h = 2;
+            h.h = 2;
             return;
-        }f.h = 0;
+        }h.h = 0;
         break;
       case 2:
         if ("export" === b) {
           if (!P.export || "function" !== typeof P.export) {
             throw Error('Either no extern configuration provided for the Worker-Index or no method was defined on the config property "export".');
           }
-          d = [P.export];
+          d[1] ? (d[0] = P.export, d[2] = 0, d[3] = 1) : d = null;
         }
         if ("import" === b) {
           if (!P.import || "function" !== typeof P.import) {
             throw Error('Either no extern configuration provided for the Worker-Index or no method was defined on the config property "import".');
           }
-          return E(f, P.import.call(O, O), 5);
+          if (!d[0]) {
+            h.h = 5;
+            break;
+          }
+          return E(h, P.import.call(O, d[0]), 9);
         }
-        g = O[b].apply(O, d);
-        if (!g.then) {
-          f.h = 5;
+        f = d && O[b].apply(O, d);
+        if (!f || !f.then) {
+          h.h = 5;
           break;
         }
-        return E(f, g, 7);
+        return E(h, f, 7);
       case 7:
-        g = f.D;
-        f.h = 5;
+        f = h.D;
+        h.h = 5;
         break;
+      case 9:
+        g = h.D, O.import(d[0], g);
       case 5:
-        postMessage("search" === b ? {id:c, msg:g} : {id:c}), f.h = 0;
+        postMessage("search" === b ? {id:c, msg:f} : {id:c}), h.h = 0;
     }
   });
 }
 ;function Ia(a) {
-  La.call(a, "add");
-  La.call(a, "append");
-  La.call(a, "search");
-  La.call(a, "update");
-  La.call(a, "remove");
+  Ja.call(a, "add");
+  Ja.call(a, "append");
+  Ja.call(a, "search");
+  Ja.call(a, "update");
+  Ja.call(a, "remove");
 }
 var Ma, Na, Oa = {}, Pa = {};
 function Qa(a) {
   Ma = 0;
   Oa[a] = Pa[a];
 }
-function La(a) {
+function Ja(a) {
   this[a + "Async"] = function() {
     var b = arguments, c = b[b.length - 1];
     if ("function" === typeof c) {
@@ -1175,15 +1181,15 @@ function La(a) {
       Oa[a] = Pa[a] = Pa[a] * this.priority * this.priority * 3 / (Date.now() - Na) | 0 || 1;
       Ma = clearTimeout(Ma);
       var e = this;
-      return new Promise(function(f) {
+      return new Promise(function(g) {
         setTimeout(function() {
-          f(e[a + "Async"].apply(e, b));
+          g(e[a + "Async"].apply(e, b));
         }, 0);
       });
     }
-    var g = this[a].apply(this, b);
-    c = g.then ? g : new Promise(function(f) {
-      return f(g);
+    var f = this[a].apply(this, b);
+    c = f.then ? f : new Promise(function(g) {
+      return g(f);
     });
     d && c.then(d);
     return c;
@@ -1191,13 +1197,13 @@ function La(a) {
 }
 ;var Ra = 0;
 function Sa(a) {
-  function b(f) {
+  function b(g) {
     function h(k) {
       k = k.data || k;
       var l = k.id, m = l && e.h[l];
       m && (m(k.msg), delete e.h[l]);
     }
-    this.worker = f;
+    this.worker = g;
     this.h = J();
     if (this.worker) {
       d ? this.worker.on("message", h) : this.worker.onmessage = h;
@@ -1219,10 +1225,10 @@ function Sa(a) {
   }
   var c = "undefined" !== typeof self ? self._factory : "undefined" !== typeof window ? window._factory : null;
   c && (c = c.toString());
-  var d = "undefined" === typeof window, e = this, g = Ta(c, d, a.worker);
-  return g.then ? g.then(function(f) {
-    return b.call(e, f);
-  }) : b.call(this, g);
+  var d = "undefined" === typeof window, e = this, f = Ta(c, d, a.worker);
+  return f.then ? f.then(function(g) {
+    return b.call(e, g);
+  }) : b.call(this, f);
 }
 T("add");
 T("append");
@@ -1232,24 +1238,24 @@ T("remove");
 T("clear");
 T("export");
 T("import");
+Ia(Sa.prototype);
 function T(a) {
-  Sa.prototype[a] = Sa.prototype[a + "Async"] = function() {
-    var b = this, c = arguments, d, e, g, f, h;
-    return ta(function(k) {
-      d = b;
-      e = [].slice.call(c);
-      g = e[e.length - 1];
-      "function" === typeof g && (f = g, e.splice(e.length - 1, 1));
-      h = new Promise(function(l) {
-        d.h[++Ra] = l;
-        d.worker.postMessage({task:a, id:Ra, args:e});
-      });
-      return f ? (h.then(f), k.return(b)) : k.return(h);
+  Sa.prototype[a] = function() {
+    var b = this, c = [].slice.call(arguments), d = c[c.length - 1];
+    if ("function" === typeof d) {
+      var e = d;
+      c.pop();
+    }
+    d = new Promise(function(f) {
+      "export" === a && "function" === typeof c[0] && (c[0] = null);
+      b.h[++Ra] = f;
+      b.worker.postMessage({task:a, id:Ra, args:c});
     });
+    return e ? (d.then(e), this) : d;
   };
 }
 function Ta(a, b, c) {
-  return b ? "undefined" !== typeof module ? new (require("worker_threads")["Worker"])(__dirname + "/node/node.js") : import("worker_threads").then(function(worker){ return new worker["Worker"]((1,eval)("import.meta.dirname") + "/node/node.mjs"); }) : a ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + Ha.toString()], {type:"text/javascript"}))) : new window.Worker(K(c) ? c : (0,eval)("import.meta.url").replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", 
+  return b ? "undefined" !== typeof module ? new (require("worker_threads")["Worker"])(__dirname + "/node/node.js") : import("worker_threads").then(function(worker){ return new worker["Worker"]((1,eval)("import.meta.dirname") + "/node/node.mjs"); }) : a ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + Ha.toString()], {type:"text/javascript"}))) : new window.Worker("string" === typeof c ? c : (0,eval)("import.meta.url").replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", 
   "module/worker/worker.js"), {type:"module"});
 }
 ;function Ua(a, b) {
@@ -1304,28 +1310,28 @@ function Za(a, b) {
   }
   return b;
 }
-function $a(a, b, c, d, e, g, f) {
-  f = void 0 === f ? 0 : f;
+function $a(a, b, c, d, e, f, g) {
+  g = void 0 === g ? 0 : g;
   var h = d && d.constructor === Array, k = h ? d.shift() : d;
   if (!k) {
-    return this.export(a, b, e, g + 1);
+    return this.export(a, b, e, f + 1);
   }
-  if ((k = a((b ? b + "." : "") + (f + 1) + "." + c, JSON.stringify(k))) && k.then) {
+  if ((k = a((b ? b + "." : "") + (g + 1) + "." + c, JSON.stringify(k))) && k.then) {
     var l = this;
     return k.then(function() {
-      return $a.call(l, a, b, c, h ? d : null, e, g, f + 1);
+      return $a.call(l, a, b, c, h ? d : null, e, f, g + 1);
     });
   }
-  return $a.call(this, a, b, c, h ? d : null, e, g, f + 1);
+  return $a.call(this, a, b, c, h ? d : null, e, f, g + 1);
 }
 ;function ab(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;
+  for (var e = [], f = 0, g; f < a.index.length; f++) {
+    if (g = a.index[f], b >= g.length) {
+      b -= g.length;
     } else {
-      b = f[d ? "splice" : "slice"](b, c);
-      if (f = b.length) {
-        if (e = e.length ? e.concat(b) : b, c -= f, d && (a.length -= f), !c) {
+      b = g[d ? "splice" : "slice"](b, c);
+      if (g = b.length) {
+        if (e = e.length ? e.concat(b) : b, c -= g, d && (a.length -= g), !c) {
           break;
         }
       }
@@ -1360,21 +1366,21 @@ function bb(a) {
     }
     if ("indexOf" === d) {
       return function(e) {
-        for (var g = 0, f = 0, h, k; f < b.index.length; f++) {
-          h = b.index[f];
+        for (var f = 0, g = 0, h, k; g < b.index.length; g++) {
+          h = b.index[g];
           k = h.indexOf(e);
           if (0 <= k) {
-            return g + k;
+            return f + k;
           }
-          g += h.length;
+          f += h.length;
         }
         return -1;
       };
     }
     if ("includes" === d) {
       return function(e) {
-        for (var g = 0; g < b.index.length; g++) {
-          if (b.index[g].includes(e)) {
+        for (var f = 0; f < b.index.length; f++) {
+          if (b.index[f].includes(e)) {
             return !0;
           }
         }
@@ -1382,13 +1388,13 @@ function bb(a) {
       };
     }
     if ("slice" === d) {
-      return function(e, g) {
-        return ab(b, e || 0, g || b.length, !1);
+      return function(e, f) {
+        return ab(b, e || 0, f || b.length, !1);
       };
     }
     if ("splice" === d) {
-      return function(e, g) {
-        return ab(b, e || 0, g || b.length, !0);
+      return function(e, f) {
+        return ab(b, e || 0, f || b.length, !0);
       };
     }
     if ("constructor" === d) {
@@ -1458,14 +1464,14 @@ u.clear = V.prototype.clear = function() {
   this.size = 0;
 };
 u.values = V.prototype.values = function eb() {
-  var b, c = this, d, e, g;
-  return ra(eb, function(f) {
-    switch(f.h) {
+  var b, c = this, d, e, f;
+  return ra(eb, function(g) {
+    switch(g.h) {
       case 1:
         b = 0;
       case 2:
         if (!(b < c.h.length)) {
-          f.h = 0;
+          g.h = 0;
           break;
         }
         d = w(c.h[b].values());
@@ -1473,25 +1479,25 @@ u.values = V.prototype.values = function eb() {
       case 5:
         if (e.done) {
           b++;
-          f.h = 2;
+          g.h = 2;
           break;
         }
-        g = e.value;
-        return E(f, g, 6);
+        f = e.value;
+        return E(g, f, 6);
       case 6:
-        e = d.next(), f.h = 5;
+        e = d.next(), g.h = 5;
     }
   });
 };
 u.keys = V.prototype.keys = function fb() {
-  var b, c = this, d, e, g;
-  return ra(fb, function(f) {
-    switch(f.h) {
+  var b, c = this, d, e, f;
+  return ra(fb, function(g) {
+    switch(g.h) {
       case 1:
         b = 0;
       case 2:
         if (!(b < c.h.length)) {
-          f.h = 0;
+          g.h = 0;
           break;
         }
         d = w(c.h[b].keys());
@@ -1499,25 +1505,25 @@ u.keys = V.prototype.keys = function fb() {
       case 5:
         if (e.done) {
           b++;
-          f.h = 2;
+          g.h = 2;
           break;
         }
-        g = e.value;
-        return E(f, g, 6);
+        f = e.value;
+        return E(g, f, 6);
       case 6:
-        e = d.next(), f.h = 5;
+        e = d.next(), g.h = 5;
     }
   });
 };
 u.entries = V.prototype.entries = function gb() {
-  var b, c = this, d, e, g;
-  return ra(gb, function(f) {
-    switch(f.h) {
+  var b, c = this, d, e, f;
+  return ra(gb, function(g) {
+    switch(g.h) {
       case 1:
         b = 0;
       case 2:
         if (!(b < c.h.length)) {
-          f.h = 0;
+          g.h = 0;
           break;
         }
         d = w(c.h[b].entries());
@@ -1525,13 +1531,13 @@ u.entries = V.prototype.entries = function gb() {
       case 5:
         if (e.done) {
           b++;
-          f.h = 2;
+          g.h = 2;
           break;
         }
-        g = e.value;
-        return E(f, g, 6);
+        f = e.value;
+        return E(g, f, 6);
       case 6:
-        e = d.next(), f.h = 5;
+        e = d.next(), g.h = 5;
     }
   });
 };
@@ -1556,41 +1562,41 @@ function cb() {
     }
     for (var d = 0, e; d < this.field.length; d++) {
       e = this.J[d];
-      var g = this.index.get(this.field[d]);
+      var f = this.index.get(this.field[d]);
       if ("function" === typeof e) {
-        (e = e(b)) && g.add(a, e, !1, !0);
+        (e = e(b)) && f.add(a, e, !1, !0);
       } else {
-        var f = e.R;
-        if (!f || f(b)) {
-          e.constructor === String ? e = ["" + e] : K(e) && (e = [e]), hb(b, e, this.S, 0, g, a, e[0], c);
+        var g = e.R;
+        if (!g || g(b)) {
+          e.constructor === String ? e = ["" + e] : K(e) && (e = [e]), hb(b, e, this.S, 0, f, a, e[0], c);
         }
       }
     }
     if (this.tag) {
       for (d = 0; d < this.L.length; d++) {
-        f = this.L[d];
+        g = this.L[d];
         var h = this.aa[d];
-        g = this.tag.get(h);
+        f = this.tag.get(h);
         e = J();
-        if ("function" === typeof f) {
-          if (f = f(b), !f) {
+        if ("function" === typeof g) {
+          if (g = g(b), !g) {
             continue;
           }
         } else {
-          var k = f.R;
+          var k = g.R;
           if (k && !k(b)) {
             continue;
           }
-          f.constructor === String && (f = "" + f);
-          f = ya(b, f);
+          g.constructor === String && (g = "" + g);
+          g = ya(b, g);
         }
-        if (g && f) {
-          for (K(f) && (f = [f]), h = 0, k = void 0; h < f.length; h++) {
-            var l = f[h];
+        if (f && g) {
+          for (K(g) && (g = [g]), h = 0, k = void 0; h < g.length; h++) {
+            var l = g[h];
             if (!e[l]) {
               e[l] = 1;
               var m;
-              (m = g.get(l)) ? k = m : g.set(l, k = []);
+              (m = f.get(l)) ? k = m : f.set(l, k = []);
               if (!c || !k.includes(a)) {
                 if (k.length === Math.pow(2, 31) - 1) {
                   m = new bb(k);
@@ -1599,7 +1605,7 @@ function cb() {
                       p = p.value, p.includes(k) && (p[p.indexOf(k)] = m);
                     }
                   }
-                  g.set(l, k = m);
+                  f.set(l, k = m);
                 }
                 k.push(a);
                 this.fastupdate && ((l = this.reg.get(a)) ? l.push(k) : this.reg.set(a, [k]));
@@ -1607,7 +1613,7 @@ function cb() {
             }
           }
         } else {
-          g || console.warn("Tag '" + h + "' was not found");
+          f || console.warn("Tag '" + h + "' was not found");
         }
       }
     }
@@ -1615,11 +1621,11 @@ function cb() {
       if (this.I) {
         var q = J();
         for (c = 0; c < this.I.length; c++) {
-          if (d = this.I[c], g = d.R, !g || g(b)) {
-            g = void 0;
+          if (d = this.I[c], f = d.R, !f || f(b)) {
+            f = void 0;
             if ("function" === typeof d) {
-              g = d(b);
-              if (!g) {
+              f = d(b);
+              if (!f) {
                 continue;
               }
               d = [d.ja];
@@ -1627,19 +1633,20 @@ function cb() {
               q[d] = b[d];
               continue;
             }
-            ib(b, q, d, 0, d[0], g);
+            ib(b, q, d, 0, d[0], f);
           }
         }
       }
       this.store.set(a, q || b);
     }
+    this.worker && (this.fastupdate || this.reg.add(a));
   }
   return this;
 };
-function ib(a, b, c, d, e, g) {
+function ib(a, b, c, d, e, f) {
   a = a[e];
   if (d === c.length - 1) {
-    b[e] = g || a;
+    b[e] = f || a;
   } else if (a) {
     if (a.constructor === Array) {
       for (b = b[e] = Array(a.length), e = 0; e < a.length; e++) {
@@ -1650,33 +1657,33 @@ function ib(a, b, c, d, e, g) {
     }
   }
 }
-function hb(a, b, c, d, e, g, f, h) {
-  if (a = a[f]) {
+function hb(a, b, c, d, e, f, g, h) {
+  if (a = a[g]) {
     if (d === b.length - 1) {
       if (a.constructor === Array) {
         if (c[d]) {
           for (b = 0; b < a.length; b++) {
-            e.add(g, a[b], !0, !0);
+            e.add(f, a[b], !0, !0);
           }
           return;
         }
         a = a.join(" ");
       }
-      e.add(g, a, h, !0);
+      e.add(f, a, h, !0);
     } else {
       if (a.constructor === Array) {
-        for (f = 0; f < a.length; f++) {
-          hb(a, b, c, d, e, g, f, h);
+        for (g = 0; g < a.length; g++) {
+          hb(a, b, c, d, e, f, g, h);
         }
       } else {
-        f = b[++d], hb(a, b, c, d, e, g, f, h);
+        g = b[++d], hb(a, b, c, d, e, f, g, h);
       }
     }
   } else {
-    e.db && e.remove(g);
+    e.db && e.remove(f);
   }
 }
-;function jb(a, b, c, d, e, g, f) {
+;function jb(a, b, c, d, e, f, g) {
   var h = a.length, k = [], l;
   var m = J();
   for (var n = 0, p = void 0, q; n < b; n++) {
@@ -1686,8 +1693,8 @@ function hb(a, b, c, d, e, g, f, h) {
           q = p[x];
           (l = m[q]) ? m[q]++ : (l = 0, m[q] = 1);
           l = k[l] || (k[l] = []);
-          if (!f) {
-            var r = n + (t || !e ? 0 : g || 0);
+          if (!g) {
+            var r = n + (t || !e ? 0 : f || 0);
             l = l[r] || (l[r] = []);
           }
           l.push(q);
@@ -1697,27 +1704,27 @@ function hb(a, b, c, d, e, g, f, h) {
   }
   if (a = k.length) {
     if (e) {
-      k = 1 < k.length ? kb(k, c, d, f, g) : (k = k[0]).length > c || d ? k.slice(d, c + d) : k;
+      k = 1 < k.length ? kb(k, c, d, g, f) : (k = k[0]).length > c || d ? k.slice(d, c + d) : k;
     } else {
       if (a < h) {
         return [];
       }
       k = k[a - 1];
       if (c || d) {
-        if (f) {
+        if (g) {
           if (k.length > c || d) {
             k = k.slice(d, c + d);
           }
         } else {
           e = [];
-          for (g = 0; g < k.length; g++) {
-            if (f = k[g], f.length > d) {
-              d -= f.length;
+          for (f = 0; f < k.length; f++) {
+            if (g = k[f], g.length > d) {
+              d -= g.length;
             } else {
-              if (f.length > c || d) {
-                f = f.slice(d, c + d), c -= f.length, d && (d -= f.length);
+              if (g.length > c || d) {
+                g = g.slice(d, c + d), c -= g.length, d && (d -= g.length);
               }
-              e.push(f);
+              e.push(g);
               if (!c) {
                 break;
               }
@@ -1731,18 +1738,18 @@ function hb(a, b, c, d, e, g, f, h) {
   return k;
 }
 function kb(a, b, c, d, e) {
-  var g = [], f = J(), h = a.length, k;
+  var f = [], g = J(), h = a.length, k;
   if (d) {
     for (e = h - 1; 0 <= e; e--) {
       if (k = (d = a[e]) && d.length) {
         for (h = 0; h < k; h++) {
           var l = d[h];
-          if (!f[l]) {
-            if (f[l] = 1, c) {
+          if (!g[l]) {
+            if (g[l] = 1, c) {
               c--;
             } else {
-              if (g.push(l), g.length === b) {
-                return g;
+              if (f.push(l), f.length === b) {
+                return f;
               }
             }
           }
@@ -1755,14 +1762,14 @@ function kb(a, b, c, d, e) {
       for (var q = 0; q < n.length; q++) {
         if (k = (d = n[q]) && d.length) {
           for (var t = 0; t < k; t++) {
-            if (l = d[t], !f[l]) {
-              if (f[l] = 1, c) {
+            if (l = d[t], !g[l]) {
+              if (g[l] = 1, c) {
                 c--;
               } else {
                 var x = (q + (m < h - 1 ? e || 0 : 0)) / (m + 1) | 0;
-                (g[x] || (g[x] = [])).push(l);
+                (f[x] || (f[x] = [])).push(l);
                 if (++p === b) {
-                  return g;
+                  return f;
                 }
               }
             }
@@ -1771,13 +1778,13 @@ function kb(a, b, c, d, e) {
       }
     }
   }
-  return g;
+  return f;
 }
 function lb(a, b, c) {
-  for (var d = J(), e = [], g = 0, f; g < b.length; g++) {
-    f = b[g];
-    for (var h = 0; h < f.length; h++) {
-      d[f[h]] = 1;
+  for (var d = J(), e = [], f = 0, g; f < b.length; f++) {
+    g = b[f];
+    for (var h = 0; h < g.length; h++) {
+      d[g[h]] = 1;
     }
   }
   if (c) {
@@ -1786,8 +1793,8 @@ function lb(a, b, c) {
     }
   } else {
     for (b = 0; b < a.result.length; b++) {
-      for (c = a.result[b], f = 0; f < c.length; f++) {
-        g = c[f], d[g] && ((e[b] || (e[b] = [])).push(g), d[g] = 0);
+      for (c = a.result[b], g = 0; g < c.length; g++) {
+        f = c[g], d[f] && ((e[b] || (e[b] = [])).push(f), d[f] = 0);
       }
     }
   }
@@ -1800,20 +1807,20 @@ function lb(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, d ? X.call(this, a) : a;
   }
-  for (var e = [], g = 0, f = void 0, h = void 0; g < a.length; g++) {
-    if ((f = a[g]) && (h = f.length)) {
+  for (var e = [], f = 0, g = void 0, h = void 0; f < a.length; f++) {
+    if ((g = a[f]) && (h = g.length)) {
       if (c) {
         if (c >= h) {
           c -= h;
           continue;
         }
-        c < h && (f = b ? f.slice(c, c + b) : f.slice(c), h = f.length, c = 0);
+        c < h && (g = b ? g.slice(c, c + b) : g.slice(c), h = g.length, c = 0);
       }
-      h > b && (f = f.slice(0, b), h = b);
+      h > b && (g = g.slice(0, b), h = b);
       if (!e.length && h >= b) {
-        return d ? X.call(this, f) : f;
+        return d ? X.call(this, g) : g;
       }
-      e.push(f);
+      e.push(g);
       b -= h;
       if (!b) {
         break;
@@ -1834,7 +1841,7 @@ function lb(a, b, c) {
     return a[b].apply(a, d);
   }
   d = [];
-  for (var e = [], g = 0, f = 0, h, k, l, m = 0, n = void 0; m < c.length; m++) {
+  for (var e = [], f = 0, g = 0, h, k, l, m = 0, n = void 0; m < c.length; m++) {
     if (n = c[m]) {
       var p = void 0;
       if (n.constructor === Y) {
@@ -1842,7 +1849,7 @@ function lb(a, b, c) {
       } else if (n.constructor === Array) {
         p = n;
       } else {
-        if (g = n.limit || 0, f = n.offset || 0, l = n.suggest, k = n.resolve, h = n.enrich && k, n.index) {
+        if (f = n.limit || 0, g = n.offset || 0, l = n.suggest, k = n.resolve, h = n.enrich && k, n.index) {
           n.resolve = !1, n.enrich = !1, p = n.index.search(n).result, n.resolve = k, n.enrich = h;
         } else if (n.and) {
           p = a.and(n.and);
@@ -1866,25 +1873,25 @@ function lb(a, b, c) {
       }
     }
   }
-  return {W:d, $:e, limit:g, offset:f, enrich:h, resolve:k, suggest:l};
+  return {W:d, $:e, limit:f, offset:g, enrich:h, resolve:k, suggest:l};
 }
 ;Y.prototype.or = function() {
   var a = nb(this, "or", arguments);
   return ob.call(this, a.W, a.$, a.limit, a.offset, a.enrich, a.resolve);
 };
-function ob(a, b, c, d, e, g) {
+function ob(a, b, c, d, e, f) {
   if (b.length) {
-    var f = this;
+    var g = this;
     return Promise.all(b).then(function(h) {
       a = [];
       for (var k = 0, l = void 0; k < h.length; k++) {
         (l = h[k]).length && (a[k] = l);
       }
-      return ob.call(f, a, [], c, d, e, g);
+      return ob.call(g, a, [], c, d, e, f);
     });
   }
   a.length && (this.result.length && a.push(this.result), 2 > a.length ? this.result = a[0] : (this.result = kb(a, c, d, !1, this.h), d = 0));
-  return g ? this.resolve(c, d, e) : this;
+  return f ? this.resolve(c, d, e) : this;
 }
 ;Y.prototype.and = function() {
   var a = this.result.length;
@@ -1895,12 +1902,12 @@ function ob(a, b, c, d, e, g) {
       var c = b.resolve;
       var d = b.limit;
       var e = b.offset;
-      var g = b.enrich && c;
+      var f = b.enrich && c;
     }
   }
-  return a ? (a = nb(this, "and", arguments), pb.call(this, a.W, a.$, a.limit, a.offset, a.enrich, a.resolve, a.suggest)) : c ? this.resolve(d, e, g) : this;
+  return a ? (a = nb(this, "and", arguments), pb.call(this, a.W, a.$, a.limit, a.offset, a.enrich, a.resolve, a.suggest)) : c ? this.resolve(d, e, f) : this;
 };
-function pb(a, b, c, d, e, g, f) {
+function pb(a, b, c, d, e, f, g) {
   if (b.length) {
     var h = this;
     return Promise.all(b).then(function(k) {
@@ -1908,7 +1915,7 @@ function pb(a, b, c, d, e, g, f) {
       for (var l = 0, m = void 0; l < k.length; l++) {
         (m = k[l]).length && (a[l] = m);
       }
-      return pb.call(h, a, [], c, d, e, g, f);
+      return pb.call(h, a, [], c, d, e, f, g);
     });
   }
   if (a.length) {
@@ -1916,20 +1923,20 @@ function pb(a, b, c, d, e, g, f) {
       this.result = a[0];
     } else {
       if (b = za(a)) {
-        return this.result = jb(a, b, c, d, f, this.h, g), g ? e ? X.call(this.index, this.result) : this.result : this;
+        return this.result = jb(a, b, c, d, g, this.h, f), f ? e ? X.call(this.index, this.result) : this.result : this;
       }
       this.result = [];
     }
   } else {
-    f || (this.result = a);
+    g || (this.result = a);
   }
-  return g ? this.resolve(c, d, e) : this;
+  return f ? this.resolve(c, d, e) : this;
 }
 ;Y.prototype.xor = function() {
   var a = nb(this, "xor", arguments);
   return qb.call(this, a.W, a.$, a.limit, a.offset, a.enrich, a.resolve, a.suggest);
 };
-function qb(a, b, c, d, e, g, f) {
+function qb(a, b, c, d, e, f, g) {
   if (b.length) {
     var h = this;
     return Promise.all(b).then(function(k) {
@@ -1937,28 +1944,28 @@ function qb(a, b, c, d, e, g, f) {
       for (var l = 0, m = void 0; l < k.length; l++) {
         (m = k[l]).length && (a[l] = m);
       }
-      return qb.call(h, a, [], c, d, e, g, f);
+      return qb.call(h, a, [], c, d, e, f, g);
     });
   }
   if (a.length) {
     if (this.result.length && a.unshift(this.result), 2 > a.length) {
       this.result = a[0];
     } else {
-      return this.result = rb.call(this, a, c, d, g, this.h), g ? e ? X.call(this.index, this.result) : this.result : this;
+      return this.result = rb.call(this, a, c, d, f, this.h), f ? e ? X.call(this.index, this.result) : this.result : this;
     }
   } else {
-    f || (this.result = a);
+    g || (this.result = a);
   }
-  return g ? this.resolve(c, d, e) : this;
+  return f ? this.resolve(c, d, e) : this;
 }
 function rb(a, b, c, d, e) {
-  for (var g = [], f = J(), h = 0, k = 0, l; k < a.length; k++) {
+  for (var f = [], g = J(), h = 0, k = 0, l; k < a.length; k++) {
     if (l = a[k]) {
       h < l.length && (h = l.length);
       for (var m = 0, n; m < l.length; m++) {
         if (n = l[m]) {
           for (var p = 0, q; p < n.length; p++) {
-            q = n[p], f[q] = f[q] ? 2 : 1;
+            q = n[p], g[q] = g[q] ? 2 : 1;
           }
         }
       }
@@ -1969,20 +1976,20 @@ function rb(a, b, c, d, e) {
       if (n = a[m]) {
         if (n = n[k]) {
           for (p = 0; p < n.length; p++) {
-            if (q = n[p], 1 === f[q]) {
+            if (q = n[p], 1 === g[q]) {
               if (c) {
                 c--;
               } else {
                 if (d) {
-                  if (g.push(q), g.length === b) {
-                    return g;
+                  if (f.push(q), f.length === b) {
+                    return f;
                   }
                 } else {
                   var t = k + (m ? e : 0);
-                  g[t] || (g[t] = []);
-                  g[t].push(q);
+                  f[t] || (f[t] = []);
+                  f[t].push(q);
                   if (++l === b) {
-                    return g;
+                    return f;
                   }
                 }
               }
@@ -1992,13 +1999,13 @@ function rb(a, b, c, d, e) {
       }
     }
   }
-  return g;
+  return f;
 }
 ;Y.prototype.not = function() {
   var a = nb(this, "not", arguments);
   return sb.call(this, a.W, a.$, a.limit, a.offset, a.enrich, a.resolve, a.suggest);
 };
-function sb(a, b, c, d, e, g, f) {
+function sb(a, b, c, d, e, f, g) {
   if (b.length) {
     var h = this;
     return Promise.all(b).then(function(k) {
@@ -2006,23 +2013,23 @@ function sb(a, b, c, d, e, g, f) {
       for (var l = 0, m = void 0; l < k.length; l++) {
         (m = k[l]).length && (a[l] = m);
       }
-      return sb.call(h, a, [], c, d, e, g, f);
+      return sb.call(h, a, [], c, d, e, f, g);
     });
   }
   if (a.length && this.result.length) {
-    this.result = tb.call(this, a, c, d, g);
-  } else if (g) {
+    this.result = tb.call(this, a, c, d, f);
+  } else if (f) {
     return this.resolve(c, d, e);
   }
-  return g ? e ? X.call(this.index, this.result) : this.result : this;
+  return f ? e ? X.call(this.index, this.result) : this.result : this;
 }
 function tb(a, b, c, d) {
   var e = [];
   a = new Set(a.flat().flat());
-  for (var g = 0, f, h = 0; g < this.result.length; g++) {
-    if (f = this.result[g]) {
-      for (var k = 0, l; k < f.length; k++) {
-        if (l = f[k], !a.has(l)) {
+  for (var f = 0, g, h = 0; f < this.result.length; f++) {
+    if (g = this.result[f]) {
+      for (var k = 0, l; k < g.length; k++) {
+        if (l = g[k], !a.has(l)) {
           if (c) {
             c--;
           } else {
@@ -2031,7 +2038,7 @@ function tb(a, b, c, d) {
                 return e;
               }
             } else {
-              if (e[g] || (e[g] = []), e[g].push(l), ++h === b) {
+              if (e[f] || (e[f] = []), e[f].push(l), ++h === b) {
                 return e;
               }
             }
@@ -2094,7 +2101,7 @@ Y.prototype.resolve = function(a, b, c) {
 J();
 W.prototype.search = function(a, b, c, d) {
   c || (!b && M(a) ? (c = a, a = "") : M(b) && (c = b, b = 0));
-  var e = [], g = [], f = 0;
+  var e = [], f = [], g = 0;
   if (c) {
     c.constructor === Array && (c = {index:c});
     a = c.query || a;
@@ -2155,19 +2162,19 @@ W.prototype.search = function(a, b, c, d) {
       if (!a) {
         p = [];
         if (r.length) {
-          for (g = 0; g < r.length; g += 2) {
+          for (f = 0; f < r.length; f += 2) {
             h = void 0;
             if (this.db) {
-              h = this.index.get(r[g]);
+              h = this.index.get(r[f]);
               if (!h) {
-                console.warn("Tag '" + r[g] + ":" + r[g + 1] + "' will be skipped because there is no field '" + r[g] + "'.");
+                console.warn("Tag '" + r[f] + ":" + r[f + 1] + "' will be skipped because there is no field '" + r[f] + "'.");
                 continue;
               }
-              p.push(h = h.db.tag(r[g + 1], b, x, q));
+              p.push(h = h.db.tag(r[f + 1], b, x, q));
             } else {
-              h = ub.call(this, r[g], r[g + 1], b, x, q);
+              h = ub.call(this, r[f], r[f + 1], b, x, q);
             }
-            e.push({field:r[g], tag:r[g + 1], result:h});
+            e.push({field:r[f], tag:r[f + 1], result:h});
           }
         }
         return p.length ? Promise.all(p).then(function(Q) {
@@ -2195,10 +2202,10 @@ W.prototype.search = function(a, b, c, d) {
         if (m) {
           if (this.db) {
             y.tag = m;
-            var Ja = v.db.support_tag_search;
+            var Ka = v.db.support_tag_search;
             y.field = l;
           }
-          Ja || (y.enrich = !1);
+          Ka || (y.enrich = !1);
         }
         if (r) {
           r[A] = v.search(a, b, y);
@@ -2213,7 +2220,7 @@ W.prototype.search = function(a, b, c, d) {
         D = [];
         G = 0;
         if (this.db && d) {
-          if (!Ja) {
+          if (!Ka) {
             for (H = l.length; H < d.length; H++) {
               var L = d[H];
               if (L && L.length) {
@@ -2251,24 +2258,24 @@ W.prototype.search = function(a, b, c, d) {
         }
       }
       if (y) {
-        g[f] = z, e.push(v), f++;
+        f[g] = z, e.push(v), g++;
       } else if (1 === l.length) {
         return p ? e : new Y(e);
       }
     }
   }
   if (r) {
-    if (this.db && m && m.length && !Ja) {
+    if (this.db && m && m.length && !Ka) {
       for (q = 0; q < m.length; q += 2) {
-        g = this.index.get(m[q]);
-        if (!g) {
+        f = this.index.get(m[q]);
+        if (!f) {
           if (console.warn("Tag '" + m[q] + ":" + m[q + 1] + "' was not found because there is no field '" + m[q] + "'."), n) {
             continue;
           } else {
             return p ? e : new Y(e);
           }
         }
-        r.push(g.db.tag(m[q + 1], b, x, !1));
+        r.push(f.db.tag(m[q + 1], b, x, !1));
       }
     }
     var Yb = this;
@@ -2276,7 +2283,7 @@ W.prototype.search = function(a, b, c, d) {
       return Q.length ? Yb.search(a, b, c, Q) : Q;
     });
   }
-  if (!f) {
+  if (!g) {
     return p ? e : new Y(e);
   }
   if (h && (!q || !this.store)) {
@@ -2284,44 +2291,44 @@ W.prototype.search = function(a, b, c, d) {
   }
   r = [];
   x = 0;
-  for (n = void 0; x < g.length; x++) {
+  for (n = void 0; x < f.length; x++) {
     n = e[x];
     q && n.length && !n[0].doc && (this.db ? r.push(n = this.index.get(this.field[0]).db.enrich(n)) : n = X.call(this, n));
     if (h) {
       return p ? n : new Y(n);
     }
-    e[x] = {field:g[x], result:n};
+    e[x] = {field:f[x], result:n};
   }
   if (q && this.db && r.length) {
-    var Ka = this;
+    var La = this;
     return Promise.all(r).then(function(Q) {
       for (var R = 0; R < Q.length; R++) {
         e[R].result = Q[R];
       }
-      return k ? vb(e, b) : t ? wb(e, a, Ka.index, Ka.field, Ka.J, t) : e;
+      return k ? vb(e, b) : t ? wb(e, a, La.index, La.field, La.J, t) : e;
     });
   }
   return k ? vb(e, b) : t ? wb(e, a, this.index, this.field, this.J, t) : e;
 };
-function wb(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 = "", t = ya(m[p].doc, n), x = f.encode(t);
-      t = t.split(f.split);
+function wb(a, b, c, d, e, f) {
+  for (var g, h, k, l = 0, m, n, p; l < a.length; l++) {
+    for (m = a[l].result, n = a[l].field, k = c.get(n), p = k.encoder, k = k.tokenize, n = e[d.indexOf(n)], p !== g && (g = p, h = g.encode(b)), p = 0; p < m.length; p++) {
+      var q = "", t = ya(m[p].doc, n), x = g.encode(t);
+      t = t.split(g.split);
       for (var r = 0, A, z; r < x.length; r++) {
         A = x[r];
         z = t[r];
         for (var v = void 0, y = 0, D; y < h.length; y++) {
           if (D = h[y], "strict" === k) {
             if (A === D) {
-              q += (q ? " " : "") + g.replace("$1", z);
+              q += (q ? " " : "") + f.replace("$1", z);
               v = !0;
               break;
             }
           } else {
             var G = A.indexOf(D);
             if (-1 < G) {
-              q += (q ? " " : "") + z.substring(0, G) + g.replace("$1", z.substring(G, D.length)) + z.substring(G + D.length);
+              q += (q ? " " : "") + z.substring(0, G) + f.replace("$1", z.substring(G, D.length)) + z.substring(G + D.length);
               v = !0;
               break;
             }
@@ -2335,17 +2342,17 @@ function wb(a, b, c, d, e, g) {
   return a;
 }
 function vb(a, b) {
-  for (var c = [], d = J(), e = 0, g, f; e < a.length; e++) {
-    g = a[e];
-    f = g.result;
-    for (var h = 0, k, l, m; h < f.length; h++) {
-      if (l = f[h], k = l.id, m = d[k]) {
-        m.push(g.field);
+  for (var c = [], d = J(), e = 0, f, g; e < a.length; e++) {
+    f = a[e];
+    g = f.result;
+    for (var h = 0, k, l, m; h < g.length; h++) {
+      if (l = g[h], k = l.id, m = d[k]) {
+        m.push(f.field);
       } else {
         if (c.length === b) {
           return c;
         }
-        l.field = d[k] = [g.field];
+        l.field = d[k] = [f.field];
         c.push(l);
       }
     }
@@ -2353,16 +2360,16 @@ function vb(a, b) {
   return c;
 }
 function ub(a, b, c, d, e) {
-  var g = this.tag.get(a);
-  if (!g) {
+  var f = this.tag.get(a);
+  if (!f) {
     return console.warn("Tag '" + a + "' was not found"), [];
   }
-  if ((a = (g = g && g.get(b)) && g.length - d) && 0 < a) {
+  if ((a = (f = f && f.get(b)) && f.length - d) && 0 < a) {
     if (a > c || d) {
-      g = g.slice(d, d + c);
+      f = f.slice(d, d + c);
     }
-    e && (g = X.call(this, g));
-    return g;
+    e && (f = X.call(this, f));
+    return f;
   }
 }
 function X(a) {
@@ -2419,14 +2426,14 @@ function X(a) {
       b = b.value, b.then && a.push(b);
     }
     if (a.length) {
-      var g = this;
-      return Promise.all(a).then(function(f) {
-        for (var h = 0, k = w(g.index.entries()), l = k.next(); !l.done; l = k.next()) {
+      var f = this;
+      return Promise.all(a).then(function(g) {
+        for (var h = 0, k = w(f.index.entries()), l = k.next(); !l.done; l = k.next()) {
           l = l.value;
           var m = l[0];
-          l[1].then && g.index.set(m, f[h++]);
+          l[1].then && f.index.set(m, g[h++]);
         }
-        return g;
+        return f;
       });
     }
   } else {
@@ -2452,26 +2459,26 @@ u.mount = function(a) {
   c = [];
   d = {db:a.db, type:a.type, fastupdate:a.fastupdate};
   e = 0;
-  for (var g; e < b.length; e++) {
-    d.field = g = b[e];
-    g = this.index.get(g);
-    var f = new a.constructor(a.id, d);
-    f.id = a.id;
-    c[e] = f.mount(g);
-    g.document = !0;
-    e ? g.bypass = !0 : g.store = this.store;
+  for (var f; e < b.length; e++) {
+    d.field = f = b[e];
+    f = this.index.get(f);
+    var g = new a.constructor(a.id, d);
+    g.id = a.id;
+    c[e] = g.mount(f);
+    f.document = !0;
+    e ? f.bypass = !0 : f.store = this.store;
   }
   this.db = !0;
   return Promise.all(c);
 };
 u.commit = function(a, b) {
-  var c = this, d, e, g, f;
+  var c = this, d, e, f, g;
   return ta(function(h) {
     if (1 == h.h) {
       d = [];
       e = w(c.index.values());
-      for (g = e.next(); !g.done; g = e.next()) {
-        f = g.value, d.push(f.db.commit(f, a, b));
+      for (f = e.next(); !f.done; f = e.next()) {
+        g = f.value, d.push(g.db.commit(g, a, b));
       }
       return E(h, Promise.all(d), 2);
     }
@@ -2488,17 +2495,17 @@ u.destroy = function() {
 function yb(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++) {
-    g = d[e];
-    K(g) || (f = g, g = g.field);
-    f = M(f) ? Object.assign({}, a, f) : a;
+  for (var e = 0, f, g = void 0; e < d.length; e++) {
+    f = d[e];
+    K(f) || (g = f, f = f.field);
+    g = M(g) ? Object.assign({}, a, g) : a;
     if (this.worker) {
-      var h = new Sa(f);
-      c.set(g, h);
+      var h = new Sa(g);
+      c.set(f, h);
     }
-    this.worker || c.set(g, new S(f, this.reg));
-    f.custom ? this.J[e] = f.custom : (this.J[e] = xb(g, this.S), f.filter && ("string" === typeof this.J[e] && (this.J[e] = new String(this.J[e])), this.J[e].R = f.filter));
-    this.field[e] = g;
+    this.worker || c.set(f, new S(g, this.reg));
+    g.custom ? this.J[e] = g.custom : (this.J[e] = xb(f, this.S), g.filter && ("string" === typeof this.J[e] && (this.J[e] = new String(this.J[e])), this.J[e].R = g.filter));
+    this.field[e] = f;
   }
   if (this.I) {
     for (a = b.store, K(a) && (a = [a]), b = 0; b < a.length; b++) {
@@ -2530,11 +2537,11 @@ u.remove = function(a) {
       for (b = w(this.tag.values()), c = b.next(); !c.done; c = b.next()) {
         c = c.value;
         for (var d = w(c), e = d.next(); !e.done; e = d.next()) {
-          var g = e.value;
-          e = g[0];
-          g = g[1];
-          var f = g.indexOf(a);
-          -1 < f && (1 < g.length ? g.splice(f, 1) : c.delete(e));
+          var f = e.value;
+          e = f[0];
+          f = f[1];
+          var g = f.indexOf(a);
+          -1 < g && (1 < f.length ? f.splice(g, 1) : c.delete(e));
         }
       }
     }
@@ -2581,54 +2588,65 @@ u.export = function(a, b, c, d) {
   if (c < this.field.length) {
     var e = this.field[c];
     if ((b = this.index.get(e).export(a, e, c, d = 1)) && b.then) {
-      var g = this;
+      var f = this;
       return b.then(function() {
-        return g.export(a, e, c + 1);
+        return f.export(a, e, c + 1);
       });
     }
     return this.export(a, e, c + 1);
   }
   switch(d) {
     case 0:
-      var f = "reg";
+      var g = "reg";
       var h = Ya(this.reg);
       b = null;
       break;
     case 1:
-      f = "tag";
+      g = "tag";
       h = Wa(this.tag, this.reg.size);
       b = null;
       break;
     case 2:
-      f = "doc";
+      g = "doc";
       h = Ua(this.store);
       b = null;
       break;
     case 3:
-      f = "cfg";
+      g = "cfg";
       b = h = null;
       break;
     default:
       return;
   }
-  return $a.call(this, a, b, f, h, c, d);
+  return $a.call(this, a, b, g, h, c, d);
 };
 u.import = function(a, b) {
+  var c = a.split(".");
+  "json" === c[c.length - 1] && c.pop();
+  var d = 2 < c.length ? c[0] : "";
+  c = 2 < c.length ? c[2] : c[1];
+  if (this.worker && d) {
+    return this.index.get(d).import(a);
+  }
   if (b) {
     "string" === typeof 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);
+    if (d) {
+      return this.index.get(d).import(c, b);
     }
-    switch(a) {
+    switch(c) {
       case "reg":
         this.fastupdate = !1;
         this.reg = Za(b, this.reg);
         for (b = 0; b < this.field.length; b++) {
-          c = this.index.get(this.field[b]), c.fastupdate = !1, c.reg = this.reg;
+          d = this.index.get(this.field[b]), d.fastupdate = !1, d.reg = this.reg;
+        }
+        if (this.worker) {
+          b = [];
+          d = w(this.index.values());
+          for (c = d.next(); !c.done; c = d.next()) {
+            b.push(c.value.import(a));
+          }
+          return Promise.all(b);
         }
         break;
       case "tag":
@@ -2648,9 +2666,9 @@ function zb(a, b, c) {
     d = this.search(a, b, c);
     if (d.then) {
       var e = this;
-      d.then(function(g) {
-        e.cache.set(a, g);
-        return g;
+      d.then(function(f) {
+        e.cache.set(a, f);
+        return f;
       });
     }
     this.cache.set(a, d);
@@ -2693,7 +2711,7 @@ var Gb = /[\x00-\x7F]+/g;
 var Hb = /[\x00-\x7F]+/g;
 var Ib = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:Ab, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:Bb}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:Bb, matcher:Cb, replacer:Db}, LatinExtra:{normalize:!0, dedupe:!0, mapper:Bb, replacer:Db.concat([/(?!^)[aeo]/g, ""]), matcher:Cb}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
   for (var b = 0; b < a.length; b++) {
-    for (var c = a[b], d = c.charAt(0), e = Eb[d], g = 1, f; g < c.length && (f = c.charAt(g), "h" === f || "w" === f || !(f = Eb[f]) || f === e || (d += f, e = f, 4 !== d.length)); g++) {
+    for (var c = a[b], d = c.charAt(0), e = Eb[d], f = 1, g; f < c.length && (g = c.charAt(f), "h" === g || "w" === g || !(g = Eb[g]) || g === e || (d += g, e = g, 4 !== d.length)); f++) {
     }
     a[b] = d;
   }
@@ -2712,9 +2730,9 @@ S.prototype.add = function(a, b, c, d) {
     }
     b = this.encoder.encode(b);
     if (d = b.length) {
-      for (var e = J(), g = J(), f = this.depth, h = this.resolution, k = 0; k < d; k++) {
+      for (var e = J(), f = J(), g = this.depth, h = this.resolution, k = 0; k < d; k++) {
         var l = b[this.rtl ? d - 1 - k : k], m = l.length;
-        if (m && (f || !g[l])) {
+        if (m && (g || !f[l])) {
           var n = this.score ? this.score(b, l, k, null, 0) : Kb(h, d, k), p = "";
           switch(this.tokenize) {
             case "full":
@@ -2723,7 +2741,7 @@ S.prototype.add = function(a, b, c, d) {
                   for (var q = m; q > n; q--) {
                     p = l.substring(n, q);
                     var t = this.score ? this.score(b, l, k, p, n) : Kb(h, d, k, m, n);
-                    Lb(this, g, p, t, a, c);
+                    Lb(this, f, p, t, a, c);
                   }
                 }
                 break;
@@ -2731,20 +2749,20 @@ S.prototype.add = function(a, b, c, d) {
             case "reverse":
               if (1 < m) {
                 for (q = m - 1; 0 < q; q--) {
-                  p = l[q] + p, t = this.score ? this.score(b, l, k, p, q) : Kb(h, d, k, m, q), Lb(this, g, p, t, a, c);
+                  p = l[q] + p, t = this.score ? this.score(b, l, k, p, q) : Kb(h, d, k, m, q), Lb(this, f, p, t, a, c);
                 }
                 p = "";
               }
             case "forward":
               if (1 < m) {
                 for (q = 0; q < m; q++) {
-                  p += l[q], Lb(this, g, p, n, a, c);
+                  p += l[q], Lb(this, f, p, n, a, c);
                 }
                 break;
               }
             default:
-              if (Lb(this, g, l, n, a, c), f && 1 < d && k < d - 1) {
-                for (m = J(), p = this.da, n = l, q = Math.min(f + 1, d - k), t = m[n] = 1; t < q; t++) {
+              if (Lb(this, f, l, n, a, c), g && 1 < d && k < d - 1) {
+                for (m = J(), p = this.da, n = l, q = Math.min(g + 1, d - k), t = m[n] = 1; t < q; t++) {
                   if ((l = b[this.rtl ? d - 1 - k - t : k + t]) && !m[l]) {
                     m[l] = 1;
                     var x = this.score ? this.score(b, n, k, l, t) : Kb(p + (d / 2 > p ? 0 : 1), d, k, q - 1, t - 1), r = this.bidirectional && l > n;
@@ -2763,15 +2781,15 @@ S.prototype.add = function(a, b, c, d) {
   this.db && (b || this.commit_task.push({del:a}), this.ca && Mb(this));
   return this;
 };
-function Lb(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)) {
+function Lb(a, b, c, d, e, f, g) {
+  var h = g ? a.ctx : a.map, k;
+  if (!b[c] || g && !(k = b[c])[g]) {
+    if (g ? (b = k || (b[c] = J()), b[g] = 1, (k = h.get(g)) ? h = k : h.set(g, h = new Map())) : b[c] = 1, (k = h.get(c)) ? h = k : h.set(c, h = k = []), h = h[d] || (h[d] = []), !f || !h.includes(e)) {
       if (h.length === Math.pow(2, 31) - 1) {
         b = new bb(h);
         if (a.fastupdate) {
-          for (c = w(a.reg.values()), g = c.next(); !g.done; g = c.next()) {
-            g = g.value, g.includes(h) && (g[g.indexOf(h)] = b);
+          for (c = w(a.reg.values()), f = c.next(); !f.done; f = c.next()) {
+            f = f.value, f.includes(h) && (f[f.indexOf(h)] = b);
           }
         }
         k[d] = h = b;
@@ -2786,38 +2804,38 @@ function Kb(a, b, c, d, e) {
 }
 ;S.prototype.search = function(a, b, c) {
   c || (!b && M(a) ? (c = a, a = "") : M(b) && (c = b, b = 0));
-  var d = [], e = 0, g;
+  var d = [], e = 0, f;
   if (c) {
     a = c.query || a;
     b = c.limit || b;
     e = c.offset || 0;
-    var f = c.context;
+    var g = c.context;
     var h = c.suggest;
-    var k = (g = !1 !== c.resolve) && c.enrich;
+    var k = (f = !1 !== c.resolve) && c.enrich;
     var l = c.boost;
     var m = c.resolution;
     var n = this.db && c.tag;
   } else {
-    g = this.resolve;
+    f = this.resolve;
   }
   var p = this.encoder.encode(a);
   var q = p.length;
-  b = b || (g ? 100 : 0);
+  b = b || (f ? 100 : 0);
   if (1 === q) {
-    return Nb.call(this, p[0], "", b, e, g, k, n);
+    return Nb.call(this, p[0], "", b, e, f, k, n);
   }
-  f = this.depth && !1 !== f;
-  if (2 === q && f && !h) {
-    return Nb.call(this, p[0], p[1], b, e, g, k, n);
+  g = this.depth && !1 !== g;
+  if (2 === q && g && !h) {
+    return Nb.call(this, p[0], p[1], b, e, f, k, n);
   }
   var t = J(), x = 0;
-  if (1 < q && f) {
+  if (1 < q && g) {
     var r = p[0];
     x = 1;
   }
   m || 0 === m || (m = r ? this.da : this.resolution);
   if (this.db) {
-    if (this.db.search && (a = this.db.search(this, p, b, e, h, g, k, n), !1 !== a)) {
+    if (this.db.search && (a = this.db.search(this, p, b, e, h, f, k, n), !1 !== a)) {
       return a;
     }
     var A = this;
@@ -2853,7 +2871,7 @@ function Kb(a, b, c, d, e) {
             y.h = 2;
             break;
           case 4:
-            return y.return(Qb(d, m, b, e, h, l, g));
+            return y.return(Qb(d, m, b, e, h, l, f));
         }
       });
     }();
@@ -2870,19 +2888,19 @@ function Kb(a, b, c, d, e) {
     }
     h && r && x === q - 1 && !d.length && (r = "", x = -1, t = J());
   }
-  return Qb(d, m, b, e, h, l, g);
+  return Qb(d, m, b, e, h, l, f);
 };
-function Qb(a, b, c, d, e, g, f) {
+function Qb(a, b, c, d, e, f, g) {
   var h = a.length, k = a;
   if (1 < h) {
-    k = jb(a, b, c, d, e, g, f);
+    k = jb(a, b, c, d, e, f, g);
   } else if (1 === h) {
-    return f ? mb.call(null, a[0], c, d) : new Y(a[0]);
+    return g ? mb.call(null, a[0], c, d) : new Y(a[0]);
   }
-  return f ? k : new Y(k);
+  return g ? k : new Y(k);
 }
-function Nb(a, b, c, d, e, g, f) {
-  a = Ob(this, a, b, c, d, e, g, f);
+function Nb(a, b, c, d, e, f, g) {
+  a = Ob(this, a, b, c, d, e, f, g);
   return this.db ? a.then(function(h) {
     return e ? h || [] : new Y(h);
   }) : a && a.length ? e ? mb.call(this, a, c, d) : new Y(a) : e ? [] : new Y();
@@ -2894,9 +2912,9 @@ function Pb(a, b, c, d) {
       b.push(a);
       return;
     }
-    for (var g = 0, f; g < d; g++) {
-      if (f = a[g]) {
-        e[g] = f;
+    for (var f = 0, g; f < d; f++) {
+      if (g = a[f]) {
+        e[f] = g;
       }
     }
     if (e.length) {
@@ -2908,11 +2926,11 @@ function Pb(a, b, c, d) {
     return e;
   }
 }
-function Ob(a, b, c, d, e, g, f, h) {
+function Ob(a, b, c, d, e, f, g, h) {
   var k;
   c && (k = a.bidirectional && b > c) && (k = c, c = b, b = k);
   if (a.db) {
-    return a.db.get(b, c, d, e, g, f, h);
+    return a.db.get(b, c, d, e, f, g, h);
   }
   a = c ? (a = a.ctx.get(c)) && a.get(b) : a.map.get(b);
   return a;
@@ -2926,8 +2944,8 @@ function Ob(a, b, c, d, e, g, f, h) {
           if (2 > e.length) {
             e.pop();
           } else {
-            var g = e.indexOf(a);
-            g === c.length - 1 ? e.pop() : e.splice(g, 1);
+            var f = e.indexOf(a);
+            f === c.length - 1 ? e.pop() : e.splice(f, 1);
           }
         }
       }
@@ -2943,10 +2961,10 @@ function Ob(a, b, c, d, e, g, f, h) {
 function Rb(a, b) {
   var c = 0;
   if (a.constructor === Array) {
-    for (var d = 0, e = void 0, g; d < a.length; d++) {
+    for (var d = 0, e = void 0, f; d < a.length; d++) {
       if ((e = a[d]) && e.length) {
-        if (g = e.indexOf(b), 0 <= g) {
-          1 < e.length ? (e.splice(g, 1), c++) : delete a[d];
+        if (f = e.indexOf(b), 0 <= f) {
+          1 < e.length ? (e.splice(f, 1), c++) : delete a[d];
           break;
         } else {
           c++;
@@ -2955,7 +2973,7 @@ function Rb(a, b) {
     }
   } else {
     for (d = w(a.entries()), e = d.next(); !e.done; e = d.next()) {
-      g = e.value, e = g[0], (g = Rb(g[1], b)) ? c += g : a.delete(e);
+      f = e.value, e = f[0], (f = Rb(f[1], b)) ? c += f : a.delete(e);
     }
   }
   return c;
@@ -3064,28 +3082,28 @@ u.export = function(a, b, c, d) {
   switch(d) {
     case 0:
       var e = "reg";
-      var g = Ya(this.reg);
+      var f = Ya(this.reg);
       break;
     case 1:
       e = "cfg";
-      g = null;
+      f = null;
       break;
     case 2:
       e = "map";
-      g = Ua(this.map, this.reg.size);
+      f = Ua(this.map, this.reg.size);
       break;
     case 3:
       e = "ctx";
-      g = Wa(this.ctx, this.reg.size);
+      f = Wa(this.ctx, this.reg.size);
       break;
     default:
       return;
   }
-  return $a.call(this, a, b, e, g, c, d);
+  return $a.call(this, a, b, e, f, c, d);
 };
 u.import = function(a, b) {
   if (b) {
-    switch("string" === typeof b && (b = JSON.parse(b)), a = a.split("."), "json" === a[a.length - 1] && a.pop(), a = 1 < a.length ? a[1] : a[0], a) {
+    switch("string" === typeof b && (b = JSON.parse(b)), a = a.split("."), "json" === a[a.length - 1] && a.pop(), 3 === a.length && a.shift(), a = 1 < a.length ? a[1] : a[0], a) {
       case "reg":
         this.fastupdate = !1;
         this.reg = Za(b, this.reg);
@@ -3109,26 +3127,26 @@ u.serialize = function(a) {
   b = "index.reg=new Set([" + b + "]);";
   d = "";
   e = w(this.map.entries());
-  for (var g = e.next(); !g.done; g = e.next()) {
-    var f = g.value;
-    g = f[0];
-    f = f[1];
-    for (var h = "", k = 0, l; k < f.length; k++) {
-      l = f[k] || [""];
+  for (var f = e.next(); !f.done; f = e.next()) {
+    var g = f.value;
+    f = g[0];
+    g = g[1];
+    for (var h = "", k = 0, l; k < g.length; k++) {
+      l = g[k] || [""];
       for (var m = "", n = 0; n < l.length; n++) {
         m += (m ? "," : "") + ("string" === c ? '"' + l[n] + '"' : l[n]);
       }
       m = "[" + m + "]";
       h += (h ? "," : "") + m;
     }
-    h = '["' + g + '",[' + h + "]]";
+    h = '["' + f + '",[' + h + "]]";
     d += (d ? "," : "") + h;
   }
   d = "index.map=new Map([" + d + "]);";
   e = "";
-  g = w(this.ctx.entries());
-  for (f = g.next(); !f.done; f = g.next()) {
-    for (h = f.value, f = h[0], h = w(h[1].entries()), k = h.next(); !k.done; k = h.next()) {
+  f = w(this.ctx.entries());
+  for (g = f.next(); !g.done; g = f.next()) {
+    for (h = g.value, g = h[0], h = w(h[1].entries()), k = h.next(); !k.done; k = h.next()) {
       l = k.value;
       k = l[0];
       l = l[1];
@@ -3143,7 +3161,7 @@ u.serialize = function(a) {
         m += (m ? "," : "") + q;
       }
       m = 'new Map([["' + k + '",[' + m + "]]])";
-      m = '["' + f + '",' + m + "]";
+      m = '["' + g + '",' + m + "]";
       e += (e ? "," : "") + m;
     }
   }
@@ -3181,8 +3199,8 @@ u.open = function() {
     var d = Tb.open(a.id + (a.field ? ":" + a.field : ""), 1);
     d.onupgradeneeded = function() {
       var e = a.db = this.result;
-      Ub.forEach(function(g) {
-        e.objectStoreNames.contains(g) || e.createObjectStore(g);
+      Ub.forEach(function(f) {
+        e.objectStoreNames.contains(f) || e.createObjectStore(f);
       });
     };
     d.onblocked = function(e) {
@@ -3216,13 +3234,13 @@ u.clear = function() {
   }
   return Wb(a);
 };
-u.get = function(a, b, c, d, e, g) {
+u.get = function(a, b, c, d, e, f) {
   c = void 0 === c ? 0 : c;
   d = void 0 === d ? 0 : d;
   e = void 0 === e ? !0 : e;
-  g = void 0 === g ? !1 : g;
+  f = void 0 === f ? !1 : f;
   a = this.db.transaction(b ? "ctx" : "map", "readonly").objectStore(b ? "ctx" : "map").get(b ? b + ":" + a : a);
-  var f = this;
+  var g = this;
   return Wb(a).then(function(h) {
     var k = [];
     if (!h || !h.length) {
@@ -3247,7 +3265,7 @@ u.get = function(a, b, c, d, e, g) {
           }
         }
       }
-      return g ? f.enrich(k) : k;
+      return f ? g.enrich(k) : k;
     }
     return h;
   });
@@ -3258,15 +3276,15 @@ u.tag = function(a, b, c, d) {
   d = void 0 === d ? !1 : d;
   a = this.db.transaction("tag", "readonly").objectStore("tag").get(a);
   var e = this;
-  return Wb(a).then(function(g) {
-    if (!g || !g.length || c >= g.length) {
+  return Wb(a).then(function(f) {
+    if (!f || !f.length || c >= f.length) {
       return [];
     }
     if (!b && !c) {
-      return g;
+      return f;
     }
-    g = g.slice(c, c + b);
-    return d ? e.enrich(g) : g;
+    f = f.slice(c, c + b);
+    return d ? e.enrich(f) : f;
   });
 };
 u.enrich = function(a) {
@@ -3275,8 +3293,8 @@ u.enrich = function(a) {
     c[d] = Wb(b.get(a[d]));
   }
   return Promise.all(c).then(function(e) {
-    for (var g = 0; g < e.length; g++) {
-      e[g] = {id:a[g], doc:e[g] ? JSON.parse(e[g]) : null};
+    for (var f = 0; f < e.length; f++) {
+      e[f] = {id:a[f], doc:e[f] ? JSON.parse(e[f]) : null};
     }
     return e;
   });
@@ -3293,24 +3311,24 @@ u.transaction = function(a, b, c) {
   if (e) {
     return c.call(this, e);
   }
-  var g = this.db.transaction(a, b);
-  this.h[a + ":" + b] = e = g.objectStore(a);
-  return new Promise(function(f, h) {
-    g.onerror = function(k) {
+  var f = this.db.transaction(a, b);
+  this.h[a + ":" + b] = e = f.objectStore(a);
+  return new Promise(function(g, h) {
+    f.onerror = function(k) {
       d.h[a + ":" + b] = null;
-      g.abort();
-      g = e = null;
+      f.abort();
+      f = e = null;
       h(k);
     };
-    g.oncomplete = function(k) {
-      g = e = d.h[a + ":" + b] = null;
-      f(k || !0);
+    f.oncomplete = function(k) {
+      f = e = d.h[a + ":" + b] = null;
+      g(k || !0);
     };
     return c.call(d, e);
   });
 };
 u.commit = function(a, b, c) {
-  var d = this, e, g, f;
+  var d = this, e, f, g;
   return ta(function(h) {
     switch(h.h) {
       case 1:
@@ -3319,16 +3337,16 @@ u.commit = function(a, b, c) {
         }
         e = a.commit_task;
         a.commit_task = [];
-        g = 0;
-        f = void 0;
+        f = 0;
+        g = void 0;
       case 4:
-        if (!(g < e.length)) {
+        if (!(f < e.length)) {
           h.h = 6;
           break;
         }
-        f = e[g];
-        if (!f.clear) {
-          e[g] = f.ma;
+        g = e[f];
+        if (!g.clear) {
+          e[f] = g.ma;
           h.h = 5;
           break;
         }
@@ -3338,7 +3356,7 @@ u.commit = function(a, b, c) {
         h.h = 6;
         break;
       case 5:
-        g++;
+        f++;
         h.h = 4;
         break;
       case 6:
@@ -3459,10 +3477,10 @@ u.commit = function(a, b, c) {
   });
 };
 function Zb(a, b, c) {
-  for (var d = a.value, e, g, f = 0, h = 0, k; h < d.length; h++) {
+  for (var d = a.value, e, f, g = 0, h = 0, k; h < d.length; h++) {
     if (k = c ? d : d[h]) {
       for (var l = 0, m, n; l < b.length; l++) {
-        if (n = b[l], m = k.indexOf(g ? parseInt(n, 10) : n), 0 > m && !g && "string" === typeof n && !isNaN(n) && (m = k.indexOf(parseInt(n, 10))) && (g = 1), 0 <= m) {
+        if (n = b[l], m = k.indexOf(f ? parseInt(n, 10) : n), 0 > m && !f && "string" === typeof n && !isNaN(n) && (m = k.indexOf(parseInt(n, 10))) && (f = 1), 0 <= m) {
           if (e = 1, 1 < k.length) {
             k.splice(m, 1);
           } else {
@@ -3471,13 +3489,13 @@ function Zb(a, b, c) {
           }
         }
       }
-      f += k.length;
+      g += k.length;
     }
     if (c) {
       break;
     }
   }
-  f ? e && a.update(d) : a.delete();
+  g ? e && a.update(d) : a.delete();
   a.continue();
 }
 u.remove = function(a) {
diff --git a/dist/flexsearch.es5.min.js b/dist/flexsearch.es5.min.js
index d218150..ffea62b 100644
--- a/dist/flexsearch.es5.min.js
+++ b/dist/flexsearch.es5.min.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.111 (ES5)
+ * FlexSearch.js v0.8.113 (ES5)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -35,7 +35,7 @@ b.prototype.values;b.prototype.forEach=function(c,d){var e=this;this.h.forEach(f
 C("Array.prototype.includes",function(a){return a?a:function(b,c){var d=this;d instanceof String&&(d=String(d));var e=d.length;c=c||0;for(0>c&&(c=Math.max(c+e,0));c<e;c++){var g=d[c];if(g===b||Object.is(g,b))return!0}return!1}});
 C("String.prototype.includes",function(a){return a?a:function(b,c){if(null==this)throw new TypeError("The 'this' value for String.prototype.includes must not be null or undefined");if(b instanceof RegExp)throw new TypeError("First argument to String.prototype.includes must not be a regular expression");return-1!==this.indexOf(b,c||0)}});
 C("Array.prototype.flat",function(a){return a?a:function(b){b=void 0===b?1:b;var c=[];Array.prototype.forEach.call(this,function(d){Array.isArray(d)&&0<b?(d=Array.prototype.flat.call(d,b-1),c.push.apply(c,d)):c.push(d)});return c}});var wa="function"==typeof Object.assign?Object.assign:function(a,b){for(var c=1;c<arguments.length;c++){var d=arguments[c];if(d)for(var e in d)F(d,e)&&(a[e]=d[e])}return a};C("Object.assign",function(a){return a||wa});function H(a,b,c){var d=typeof c,e=typeof a;if("undefined"!==d){if("undefined"!==e){if(c){if("function"===e&&d===e)return function(g){return a(c(g))};b=a.constructor;if(b===c.constructor){if(b===Array)return c.concat(a);if(b===Map){b=new Map(c);d=w(a);for(e=d.next();!e.done;e=d.next())e=e.value,b.set(e[0],e[1]);return b}if(b===Set){b=new Set(c);d=w(a.values());for(e=d.next();!e.done;e=d.next())b.add(e.value);return b}}}return a}return c}return"undefined"===e?b:a}
-function I(){return Object.create(null)}function K(a){return"string"===typeof a}function M(a){return"object"===typeof a}function xa(a){var b=[];a=w(a.keys());for(var c=a.next();!c.done;c=a.next())b.push(c.value);return b}function ya(a,b){if(K(b))a=a[b];else for(var c=0;a&&c<b.length;c++)a=a[b[c]];return a}function za(a){for(var b=0,c=0,d=void 0;c<a.length;c++)(d=a[c])&&b<d.length&&(b=d.length);return b};var Aa=[["\u00aa","a"],["\u00b2","2"],["\u00b3","3"],["\u00b9","1"],["\u00ba","o"],["\u00bc","1\u20444"],["\u00bd","1\u20442"],["\u00be","3\u20444"],["\u00e0","a"],["\u00e1","a"],["\u00e2","a"],["\u00e3","a"],["\u00e4","a"],["\u00e5","a"],["\u00e7","c"],["\u00e8","e"],["\u00e9","e"],["\u00ea","e"],["\u00eb","e"],["\u00ec","i"],["\u00ed","i"],["\u00ee","i"],["\u00ef","i"],["\u00f1","n"],["\u00f2","o"],["\u00f3","o"],["\u00f4","o"],["\u00f5","o"],["\u00f6","o"],["\u00f9","u"],["\u00fa","u"],["\u00fb",
+function J(){return Object.create(null)}function K(a){return"string"===typeof a}function M(a){return"object"===typeof a}function xa(a){var b=[];a=w(a.keys());for(var c=a.next();!c.done;c=a.next())b.push(c.value);return b}function ya(a,b){if(K(b))a=a[b];else for(var c=0;a&&c<b.length;c++)a=a[b[c]];return a}function za(a){for(var b=0,c=0,d=void 0;c<a.length;c++)(d=a[c])&&b<d.length&&(b=d.length);return b};var Aa=[["\u00aa","a"],["\u00b2","2"],["\u00b3","3"],["\u00b9","1"],["\u00ba","o"],["\u00bc","1\u20444"],["\u00bd","1\u20442"],["\u00be","3\u20444"],["\u00e0","a"],["\u00e1","a"],["\u00e2","a"],["\u00e3","a"],["\u00e4","a"],["\u00e5","a"],["\u00e7","c"],["\u00e8","e"],["\u00e9","e"],["\u00ea","e"],["\u00eb","e"],["\u00ec","i"],["\u00ed","i"],["\u00ee","i"],["\u00ef","i"],["\u00f1","n"],["\u00f2","o"],["\u00f3","o"],["\u00f4","o"],["\u00f5","o"],["\u00f6","o"],["\u00f9","u"],["\u00fa","u"],["\u00fb",
 "u"],["\u00fc","u"],["\u00fd","y"],["\u00ff","y"],["\u0101","a"],["\u0103","a"],["\u0105","a"],["\u0107","c"],["\u0109","c"],["\u010b","c"],["\u010d","c"],["\u010f","d"],["\u0113","e"],["\u0115","e"],["\u0117","e"],["\u0119","e"],["\u011b","e"],["\u011d","g"],["\u011f","g"],["\u0121","g"],["\u0123","g"],["\u0125","h"],["\u0129","i"],["\u012b","i"],["\u012d","i"],["\u012f","i"],["\u0133","ij"],["\u0135","j"],["\u0137","k"],["\u013a","l"],["\u013c","l"],["\u013e","l"],["\u0140","l"],["\u0144","n"],
 ["\u0146","n"],["\u0148","n"],["\u0149","n"],["\u014d","o"],["\u014f","o"],["\u0151","o"],["\u0155","r"],["\u0157","r"],["\u0159","r"],["\u015b","s"],["\u015d","s"],["\u015f","s"],["\u0161","s"],["\u0163","t"],["\u0165","t"],["\u0169","u"],["\u016b","u"],["\u016d","u"],["\u016f","u"],["\u0171","u"],["\u0173","u"],["\u0175","w"],["\u0177","y"],["\u017a","z"],["\u017c","z"],["\u017e","z"],["\u017f","s"],["\u01a1","o"],["\u01b0","u"],["\u01c6","dz"],["\u01c9","lj"],["\u01cc","nj"],["\u01ce","a"],["\u01d0",
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-function Kb(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};R.prototype.search=function(a,b,c){c||(!b&&M(a)?(c=a,a=""):M(b)&&(c=b,b=0));var d=[],e=0,g;if(c){a=c.query||a;b=c.limit||b;e=c.offset||0;var f=c.context;var h=c.suggest;var k=(g=!1!==c.resolve)&&c.enrich;var l=c.boost;var m=c.resolution;var n=this.db&&c.tag}else g=this.resolve;var p=this.encoder.encode(a);var q=p.length;b=b||(g?100:0);if(1===q)return Nb.call(this,p[0],"",b,e,g,k,n);f=this.depth&&!1!==f;if(2===q&&f&&!h)return Nb.call(this,p[0],p[1],b,e,g,k,n);var r=I(),x=0;if(1<q&&f){var t=p[0];x=
-1}m||0===m||(m=t?this.da:this.resolution);if(this.db){if(this.db.search&&(a=this.db.search(this,p,b,e,h,g,k,n),!1!==a))return a;var A=this;return function(){var z,v;return ta(function(y){switch(y.h){case 1:v=z=void 0;case 2:if(!(x<q)){y.h=4;break}v=p[x];if(!v||r[v]){y.h=5;break}r[v]=1;return E(y,Ob(A,v,t,0,0,!1,!1),6);case 6:z=y.D;if(z=Pb(z,d,h,m)){d=z;y.h=4;break}t&&(h&&z&&d.length||(t=v));case 5:h&&t&&x===q-1&&!d.length&&(t="",x=-1,r=I());x++;y.h=2;break;case 4:return y.return(Qb(d,m,b,e,h,l,g))}})}()}for(c=
-a=void 0;x<q;x++){if((c=p[x])&&!r[c]){r[c]=1;a=Ob(this,c,t,0,0,!1,!1);if(a=Pb(a,d,h,m)){d=a;break}t&&(h&&a&&d.length||(t=c))}h&&t&&x===q-1&&!d.length&&(t="",x=-1,r=I())}return Qb(d,m,b,e,h,l,g)};function Qb(a,b,c,d,e,g,f){var h=a.length,k=a;if(1<h)k=jb(a,b,c,d,e,g,f);else if(1===h)return f?mb.call(null,a[0],c,d):new Y(a[0]);return f?k:new Y(k)}
+function Lb(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)){if(h.length===Math.pow(2,31)-1){b=new bb(h);if(a.fastupdate)for(c=w(a.reg.values()),g=c.next();!g.done;g=c.next())g=g.value,g.includes(h)&&(g[g.indexOf(h)]=b);k[d]=h=b}h.push(e);a.fastupdate&&((d=a.reg.get(e))?d.push(h):a.reg.set(e,[h]))}}
+function Kb(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};R.prototype.search=function(a,b,c){c||(!b&&M(a)?(c=a,a=""):M(b)&&(c=b,b=0));var d=[],e=0,g;if(c){a=c.query||a;b=c.limit||b;e=c.offset||0;var f=c.context;var h=c.suggest;var k=(g=!1!==c.resolve)&&c.enrich;var l=c.boost;var m=c.resolution;var n=this.db&&c.tag}else g=this.resolve;var p=this.encoder.encode(a);var q=p.length;b=b||(g?100:0);if(1===q)return Nb.call(this,p[0],"",b,e,g,k,n);f=this.depth&&!1!==f;if(2===q&&f&&!h)return Nb.call(this,p[0],p[1],b,e,g,k,n);var r=J(),x=0;if(1<q&&f){var t=p[0];x=
+1}m||0===m||(m=t?this.da:this.resolution);if(this.db){if(this.db.search&&(a=this.db.search(this,p,b,e,h,g,k,n),!1!==a))return a;var A=this;return function(){var z,v;return ta(function(y){switch(y.h){case 1:v=z=void 0;case 2:if(!(x<q)){y.h=4;break}v=p[x];if(!v||r[v]){y.h=5;break}r[v]=1;return E(y,Ob(A,v,t,0,0,!1,!1),6);case 6:z=y.D;if(z=Pb(z,d,h,m)){d=z;y.h=4;break}t&&(h&&z&&d.length||(t=v));case 5:h&&t&&x===q-1&&!d.length&&(t="",x=-1,r=J());x++;y.h=2;break;case 4:return y.return(Qb(d,m,b,e,h,l,g))}})}()}for(c=
+a=void 0;x<q;x++){if((c=p[x])&&!r[c]){r[c]=1;a=Ob(this,c,t,0,0,!1,!1);if(a=Pb(a,d,h,m)){d=a;break}t&&(h&&a&&d.length||(t=c))}h&&t&&x===q-1&&!d.length&&(t="",x=-1,r=J())}return Qb(d,m,b,e,h,l,g)};function Qb(a,b,c,d,e,g,f){var h=a.length,k=a;if(1<h)k=jb(a,b,c,d,e,g,f);else if(1===h)return f?mb.call(null,a[0],c,d):new Y(a[0]);return f?k:new Y(k)}
 function Nb(a,b,c,d,e,g,f){a=Ob(this,a,b,c,d,e,g,f);return this.db?a.then(function(h){return e?h||[]:new Y(h)}):a&&a.length?e?mb.call(this,a,c,d):new Y(a):e?[]:new Y}function Pb(a,b,c,d){var e=[];if(a&&a.length){if(a.length<=d){b.push(a);return}for(var g=0,f;g<d;g++)if(f=a[g])e[g]=f;if(e.length){b.push(e);return}}if(!c)return e}function Ob(a,b,c,d,e,g,f,h){var k;c&&(k=a.bidirectional&&b>c)&&(k=c,c=b,b=k);if(a.db)return a.db.get(b,c,d,e,g,f,h);a=c?(a=a.ctx.get(c))&&a.get(b):a.map.get(b);return a};R.prototype.remove=function(a,b){var c=this.reg.size&&(this.fastupdate?this.reg.get(a):this.reg.has(a));if(c){if(this.fastupdate)for(var d=0,e;d<c.length;d++){if(e=c[d])if(2>e.length)e.pop();else{var g=e.indexOf(a);g===c.length-1?e.pop():e.splice(g,1)}}else Rb(this.map,a),this.depth&&Rb(this.ctx,a);b||this.reg.delete(a)}this.db&&(this.commit_task.push({del:a}),this.ca&&Mb(this));this.cache&&this.cache.remove(a);return this};
 function Rb(a,b){var c=0;if(a.constructor===Array)for(var d=0,e=void 0,g;d<a.length;d++){if((e=a[d])&&e.length)if(g=e.indexOf(b),0<=g){1<e.length?(e.splice(g,1),c++):delete a[d];break}else c++}else for(d=w(a.entries()),e=d.next();!e.done;e=d.next())g=e.value,e=g[0],(g=Rb(g[1],b))?c+=g:a.delete(e);return c};function R(a,b){if(!this||this.constructor!==R)return new R(a);if(a){var c=K(a)?a:a.preset;c&&(a=Object.assign({},Jb[c],a))}else a={};c=a.context;var d=!0===c?{depth:1}:c||{},e=K(a.encoder)?Ib[a.encoder]:a.encode||a.encoder||Ab;this.encoder=e.encode?e:"object"===typeof e?new Ga(e):{encode:e};this.resolution=a.resolution||9;this.tokenize=(c=a.tokenize)&&"default"!==c&&c||"strict";this.depth="strict"===c&&d.depth||0;this.bidirectional=!1!==d.bidirectional;this.fastupdate=!!a.fastupdate;this.score=a.score||
 null;(c=a.keystore||0)&&(this.keystore=c);this.map=c?new U(c):new Map;this.ctx=c?new U(c):new Map;this.reg=b||(this.fastupdate?c?new U(c):new Map:c?new V(c):new Set);this.da=d.resolution||3;this.rtl=e.rtl||a.rtl||!1;this.cache=(c=a.cache||null)&&new Z(c);this.resolve=!1!==a.resolve;if(c=a.db)this.db=this.mount(c);this.ca=!1!==a.commit;this.commit_task=[];this.commit_timer=null;this.priority=a.priority||4}u=R.prototype;
@@ -116,10 +117,10 @@ u.mount=function(a){this.commit_timer&&(clearTimeout(this.commit_timer),this.com
 u.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};u.append=function(a,b){return this.add(a,b,!0)};u.contain=function(a){return this.db?this.db.has(a):this.reg.has(a)};u.update=function(a,b){var c=this,d=this.remove(a);return d&&d.then?d.then(function(){return c.add(a,b)}):this.add(a,b)};
 function Sb(a){var b=0;if(a.constructor===Array)for(var c=0,d=void 0;c<a.length;c++)(d=a[c])&&(b+=d.length);else for(c=w(a),d=c.next();!d.done;d=c.next()){var e=d.value;d=e[0];(e=Sb(e[1]))?b+=e:a.delete(d)}return b}u.cleanup=function(){if(!this.fastupdate)return this;Sb(this.map);this.depth&&Sb(this.ctx);return this};u.searchCache=zb;
 u.export=function(a,b,c,d){c=void 0===c?0:c;d=void 0===d?0:d;switch(d){case 0:var e="reg";var g=Ya(this.reg);break;case 1:e="cfg";g=null;break;case 2:e="map";g=Ua(this.map,this.reg.size);break;case 3:e="ctx";g=Wa(this.ctx,this.reg.size);break;default:return}return $a.call(this,a,b,e,g,c,d)};
-u.import=function(a,b){if(b)switch("string"===typeof b&&(b=JSON.parse(b)),a=a.split("."),"json"===a[a.length-1]&&a.pop(),a=1<a.length?a[1]:a[0],a){case "reg":this.fastupdate=!1;this.reg=Za(b,this.reg);break;case "map":this.map=Va(b,this.map);break;case "ctx":this.ctx=Xa(b,this.ctx)}};
+u.import=function(a,b){if(b)switch("string"===typeof b&&(b=JSON.parse(b)),a=a.split("."),"json"===a[a.length-1]&&a.pop(),3===a.length&&a.shift(),a=1<a.length?a[1]:a[0],a){case "reg":this.fastupdate=!1;this.reg=Za(b,this.reg);break;case "map":this.map=Va(b,this.map);break;case "ctx":this.ctx=Xa(b,this.ctx)}};
 u.serialize=function(a){a=void 0===a?!0:a;if(!this.reg.size)return"";for(var b="",c="",d=w(this.reg.keys()),e=d.next();!e.done;e=d.next())e=e.value,c||(c=typeof e),b+=(b?",":"")+("string"===c?'"'+e+'"':e);b="index.reg=new Set(["+b+"]);";d="";e=w(this.map.entries());for(var g=e.next();!g.done;g=e.next()){var f=g.value;g=f[0];f=f[1];for(var h="",k=0,l;k<f.length;k++){l=f[k]||[""];for(var m="",n=0;n<l.length;n++)m+=(m?",":"")+("string"===c?'"'+l[n]+'"':l[n]);m="["+m+"]";h+=(h?",":"")+m}h='["'+g+'",['+
 h+"]]";d+=(d?",":"")+h}d="index.map=new Map(["+d+"]);";e="";g=w(this.ctx.entries());for(f=g.next();!f.done;f=g.next())for(h=f.value,f=h[0],h=w(h[1].entries()),k=h.next();!k.done;k=h.next()){l=k.value;k=l[0];l=l[1];m="";n=0;for(var p;n<l.length;n++){p=l[n]||[""];for(var q="",r=0;r<p.length;r++)q+=(q?",":"")+("string"===c?'"'+p[r]+'"':p[r]);q="["+q+"]";m+=(m?",":"")+q}m='new Map([["'+k+'",['+m+"]]])";m='["'+f+'",'+m+"]";e+=(e?",":"")+m}e="index.ctx=new Map(["+e+"]);";return a?"function inject(index){"+
-b+d+e+"}":b+d+e};La(R.prototype);var Tb="undefined"!==typeof window&&(window.indexedDB||window.mozIndexedDB||window.webkitIndexedDB||window.msIndexedDB),Ub=["map","ctx","tag","reg","cfg"];
+b+d+e+"}":b+d+e};Ja(R.prototype);var Tb="undefined"!==typeof window&&(window.indexedDB||window.mozIndexedDB||window.webkitIndexedDB||window.msIndexedDB),Ub=["map","ctx","tag","reg","cfg"];
 function Vb(a,b){b=void 0===b?{}:b;if(!this)return new Vb(a,b);"object"===typeof a&&(b=a,a=a.name);a||console.info("Default storage space was used, because a name was not passed.");this.id="flexsearch"+(a?":"+a.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"");this.field=b.field?b.field.toLowerCase().replace(/[^a-z0-9_\-]/g,""):"";this.type=b.type;this.fastupdate=this.support_tag_search=!1;this.db=null;this.h={}}u=Vb.prototype;u.mount=function(a){if(!a.encoder)return a.mount(this);a.db=this;return this.open()};
 u.open=function(){var a=this;navigator.storage&&navigator.storage.persist();return this.db||new Promise(function(b,c){var d=Tb.open(a.id+(a.field?":"+a.field:""),1);d.onupgradeneeded=function(){var e=a.db=this.result;Ub.forEach(function(g){e.objectStoreNames.contains(g)||e.createObjectStore(g)})};d.onblocked=function(e){console.error("blocked",e);c()};d.onerror=function(e){console.error(this.error,e);c()};d.onsuccess=function(){a.db=this.result;a.db.onversionchange=function(){a.close()};b(a)}})};
 u.close=function(){this.db.close();this.db=null};u.destroy=function(){var a=Tb.deleteDatabase(this.id+(this.field?":"+this.field:""));return Yb(a)};u.clear=function(){for(var a=this.db.transaction(Ub,"readwrite"),b=0;b<Ub.length;b++)a.objectStore(Ub[b]).clear();return Yb(a)};
diff --git a/dist/flexsearch.light.debug.js b/dist/flexsearch.light.debug.js
index 790fdd3..7a34ec2 100644
--- a/dist/flexsearch.light.debug.js
+++ b/dist/flexsearch.light.debug.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.111 (Light/Debug)
+ * FlexSearch.js v0.8.113 (Light/Debug)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
diff --git a/dist/flexsearch.light.min.js b/dist/flexsearch.light.min.js
index 93ccb4c..5cb1809 100644
--- a/dist/flexsearch.light.min.js
+++ b/dist/flexsearch.light.min.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.111 (Light)
+ * FlexSearch.js v0.8.113 (Light)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
diff --git a/dist/flexsearch.light.module.debug.js b/dist/flexsearch.light.module.debug.js
index ed179d1..e0f6fea 100644
--- a/dist/flexsearch.light.module.debug.js
+++ b/dist/flexsearch.light.module.debug.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.111 (Bundle/Debug)
+ * FlexSearch.js v0.8.113 (Bundle/Debug)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
diff --git a/dist/flexsearch.light.module.min.js b/dist/flexsearch.light.module.min.js
index 3ed59c3..4152d44 100644
--- a/dist/flexsearch.light.module.min.js
+++ b/dist/flexsearch.light.module.min.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.111 (Bundle)
+ * FlexSearch.js v0.8.113 (Bundle)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
diff --git a/dist/module-debug/document/add.js b/dist/module-debug/document/add.js
index 32b9d4d..bf00deb 100644
--- a/dist/module-debug/document/add.js
+++ b/dist/module-debug/document/add.js
@@ -157,6 +157,10 @@ Document.prototype.add = function (id, content, _append) {
 
             this.store.set(id, payload || content);
         }
+
+        if (this.worker) {
+            this.fastupdate || this.reg.add(id);
+        }
     }
 
     return this;
diff --git a/dist/module-debug/encoder.js b/dist/module-debug/encoder.js
index f1f0276..7978b83 100644
--- a/dist/module-debug/encoder.js
+++ b/dist/module-debug/encoder.js
@@ -87,9 +87,7 @@ Encoder.prototype.assign = function (options) {
      * pre-processing string input
      * @type {Function|boolean}
      */
-    this.normalize = /** @type {Function|boolean} */merge_option(options.normalize, /* tag? */ /* stringify */ /* stringify */ /* single param */ /* skip update: */ /* append: */ /* skip update: */
-    /* skip_update: */
-    /* skip deletion */!0 /*await rows.hasNext()*/ /*await rows.hasNext()*/ /*await rows.hasNext()*/, this.normalize);
+    this.normalize = /** @type {Function|boolean} */merge_option(options.normalize, /* tag? */ /* stringify */ /* stringify */ /* single param */ /* skip update: */ /* append: */ /* skip update: */ /* skip_update: */ /* skip deletion */!0 /*await rows.hasNext()*/ /*await rows.hasNext()*/ /*await rows.hasNext()*/, this.normalize);
 
     // {
     //     letter: true,
@@ -199,7 +197,8 @@ Encoder.prototype.assign = function (options) {
     // auto-balanced cache
     this.cache = tmp = merge_option(options.cache, !0, this.cache);
     if (tmp) {
-        this.timer = null;this.cache_size = "number" == typeof tmp ? tmp : 2e5;
+        this.timer = null;
+        this.cache_size = "number" == typeof tmp ? tmp : 2e5;
         this.cache_enc = new Map();
         this.cache_term = new Map();
         this.cache_enc_length = 128;
diff --git a/dist/module-debug/serialize.js b/dist/module-debug/serialize.js
index 111be1e..54b09ca 100644
--- a/dist/module-debug/serialize.js
+++ b/dist/module-debug/serialize.js
@@ -1,3 +1,4 @@
+
 import Index from "./index.js";
 import Document from "./document.js";
 import { is_string } from "./common.js";
@@ -88,7 +89,7 @@ function json_to_ctx(json, ctx) {
 }
 
 /**
- * @param {Set<string|number>} reg
+ * @param {Set<string|number>|Map<Array<string|number>>} reg
  * @return {Array<Array<string|number>>}
  */
 function reg_to_json(reg) {
@@ -217,6 +218,9 @@ export function importIndex(key, data) {
     if ("json" === split[split.length - 1]) {
         split.pop();
     }
+    if (3 === split.length) {
+        split.shift();
+    }
     key = 1 < split.length ? split[1] : split[0];
 
     switch (key) {
@@ -319,6 +323,19 @@ export function exportDocument(callback, _field, _index_doc = 0, _index_obj = 0)
 
 export function importDocument(key, data) {
 
+    const split = key.split(".");
+    if ("json" === split[split.length - 1]) {
+        split.pop();
+    }
+    const field = 2 < split.length ? split[0] : "",
+          ref = 2 < split.length ? split[2] : split[1];
+
+
+    // trigger the import for worker field indexes
+    if (this.worker && field) {
+        return this.index.get(field).import(key);
+    }
+
     if (!data) {
         return;
     }
@@ -326,16 +343,9 @@ export function importDocument(key, data) {
         data = /** @type {Array<Object>} */JSON.parse( /** @type {string} */data);
     }
 
-    const split = key.split(".");
-    if ("json" === split[split.length - 1]) {
-        split.pop();
-    }
-    const field = 2 < split.length ? split[0] : "";
-    key = 2 < split.length ? split[2] : split[1];
-
     if (!field) {
 
-        switch (key) {
+        switch (ref) {
 
             case "reg":
 
@@ -349,6 +359,22 @@ export function importDocument(key, data) {
                     idx.reg = this.reg;
                 }
 
+                // trigger the import for worker field indexes
+                if (this.worker) {
+                    const promises = [],
+                          self = this;
+
+
+                    for (const index of this.index.values()) {
+                        // const ref = item[0];
+                        // const index = item[1];
+                        promises.push(index.import(key));
+                        //this.index.get(field).import(key);
+                    }
+
+                    return Promise.all(promises);
+                }
+
                 break;
 
             case "tag":
@@ -368,7 +394,7 @@ export function importDocument(key, data) {
         }
     } else {
 
-        return this.index.get(field).import(key, data);
+        return this.index.get(field).import(ref, data);
     }
 }
 
diff --git a/dist/module-debug/worker.js b/dist/module-debug/worker.js
index be7f1ec..1efa946 100644
--- a/dist/module-debug/worker.js
+++ b/dist/module-debug/worker.js
@@ -1,6 +1,6 @@
 
 import { IndexOptions } from "./type.js";
-import { create_object, is_function, is_object, is_string } from "./common.js";
+import { create_object } from "./common.js";
 import handler from "./worker/handler.js";
 import apply_async from "./async.js";
 
@@ -81,7 +81,6 @@ export default function WorkerIndex(options = /** @type IndexOptions */{}) {
     }
 
     const worker = create(factory, is_node_js, options.worker);
-    //worker.worker = true;
     return worker.then ? worker.then(function (worker) {
         return init.call(_self, worker);
     }) : init.call(this, worker);
@@ -96,36 +95,40 @@ register("clear");
 register("export");
 register("import");
 
+apply_async(WorkerIndex.prototype);
+
+
 function register(key) {
 
-    WorkerIndex.prototype[key] = WorkerIndex.prototype[key + "Async"] = async function () {
+    WorkerIndex.prototype[key] = function () {
         const self = this,
               args = [].slice.call(arguments),
               arg = args[args.length - 1];
 
         let callback;
 
-        if (is_function(arg)) {
+        if ("function" == typeof arg) {
             callback = arg;
-            args.splice(args.length - 1, 1);
+            args.pop();
         }
 
         const promise = new Promise(function (resolve) {
-            //setTimeout(function(){
+            if ("export" === key && "function" == typeof args[0]) {
+                // remove function handler
+                args[0] = null;
+            }
             self.resolver[++pid] = resolve;
             self.worker.postMessage({
                 task: key,
                 id: pid,
                 args: args
             });
-            //});
         });
 
         if (callback) {
             promise.then(callback);
             return this;
         } else {
-
             return promise;
         }
     };
@@ -134,8 +137,7 @@ function register(key) {
 function create(factory, is_node_js, worker_path) {
 
     let worker = is_node_js ?
-    // This eval will be removed when compiling, it isn't there in final build
-
+    // This eval will be removed when compiling
     "undefined" != typeof module ? (0, eval)('new (require("worker_threads")["Worker"])(__dirname + "/node/node.js")')
     //: (0,eval)('new ((await import("worker_threads"))["Worker"])(import.meta.dirname + "/worker/node.mjs")')
     //: (0,eval)('new ((await import("worker_threads"))["Worker"])((1,eval)(\"import.meta.dirname\") + "/node/node.mjs")')
@@ -143,7 +145,8 @@ function create(factory, is_node_js, worker_path) {
     //: import("worker_threads").then(function(worker){ return new worker["Worker"](import.meta.dirname + "/worker/node.mjs"); })
 
     //eval('new (require("worker_threads")["Worker"])(__dirname + "/node/node.js")')
-    : factory ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + handler.toString()], { type: "text/javascript" }))) : new window.Worker(is_string(worker_path) ? worker_path : import.meta.url.replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", "module/worker/worker.js") /*"worker/worker.js"*/, { type: "module" });
+    : factory ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + handler.toString()], { type: "text/javascript" }))) : new window.Worker("string" == typeof worker_path ? worker_path : import.meta.url.replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", "module/worker/worker.js") /*"worker/worker.js"*/
+    , { type: "module" });
 
     return worker;
 }
\ No newline at end of file
diff --git a/dist/module-debug/worker/handler.js b/dist/module-debug/worker/handler.js
index cf024c7..09af4fb 100644
--- a/dist/module-debug/worker/handler.js
+++ b/dist/module-debug/worker/handler.js
@@ -54,18 +54,25 @@ export default (async function (data) {
                 if (!options.export || "function" != typeof options.export) {
                     throw new Error("Either no extern configuration provided for the Worker-Index or no method was defined on the config property \"export\".");
                 }
-
-                args = [options.export];
+                // skip non-field indexes
+                if (!args[1]) args = null;else {
+                    args[0] = options.export;
+                    args[2] = 0;
+                    args[3] = 1; // skip reg
+                }
             }
             if ("import" === task) {
                 if (!options.import || "function" != typeof options.import) {
                     throw new Error("Either no extern configuration provided for the Worker-Index or no method was defined on the config property \"import\".");
                 }
 
-                await options.import.call(index, index);
+                if (args[0]) {
+                    const data = await options.import.call(index, args[0]);
+                    index.import(args[0], data);
+                }
             } else {
-                message = index[task].apply(index, args);
-                if (message.then) {
+                message = args && index[task].apply(index, args);
+                if (message && message.then) {
                     message = await message;
                 }
             }
diff --git a/dist/module-debug/worker/node.js b/dist/module-debug/worker/node.js
index 704bc49..8b8b3d8 100644
--- a/dist/module-debug/worker/node.js
+++ b/dist/module-debug/worker/node.js
@@ -1,3 +1,7 @@
+/*
+ * Node.js Worker (CommonJS)
+ * This file is a standalone file and isn't being a part of the build/bundle
+ */
 const { parentPort } = require("worker_threads"),
       { Index } = require("flexsearch");
 //const { join } = require("path");
@@ -41,16 +45,24 @@ parentPort.on("message", async function (data) {
                 if (!options.export || "function" != typeof options.export) {
                     throw new Error("Either no extern configuration provided for the Worker-Index or no method was defined on the config property \"export\".");
                 }
-                args = [options.export];
+                // skip non-field indexes
+                if (!args[1]) args = null;else {
+                    args[0] = options.export;
+                    args[2] = 0;
+                    args[3] = 1; // skip reg
+                }
             }
             if ("import" === task) {
                 if (!options.import || "function" != typeof options.import) {
                     throw new Error("Either no extern configuration provided for the Worker-Index or no method was defined on the config property \"import\".");
                 }
-                await options.import.call(index, index);
+                if (args[0]) {
+                    const data = await options.import.call(index, args[0]);
+                    index.import(args[0], data);
+                }
             } else {
-                message = index[task].apply(index, args);
-                if (message.then) {
+                message = args && index[task].apply(index, args);
+                if (message && message.then) {
                     message = await message;
                 }
             }
diff --git a/dist/module-min/document/add.js b/dist/module-min/document/add.js
index f6931ce..a13cf54 100644
--- a/dist/module-min/document/add.js
+++ b/dist/module-min/document/add.js
@@ -1 +1 @@
-import{create_object,is_array,is_object,is_string,parse_simple}from"../common.js";import{KeystoreArray}from"../keystore.js";import Document from"../document.js";Document.prototype.add=function(a,b,c){if(is_object(a)&&(b=a,a=parse_simple(b,this.key)),b&&(a||0===a)){if(!c&&this.reg.has(a))return this.update(a,b);for(let d,e=0;e<this.field.length;e++){d=this.tree[e];const f=this.index.get(this.field[e]);if("function"==typeof d){const c=d(b);c&&f.add(a,c,!1,!0)}else{const e=d._filter;if(e&&!e(b))continue;d.constructor===String?d=[""+d]:is_string(d)&&(d=[d]),add_index(b,d,this.marker,0,f,a,d[0],c)}}if(this.tag)for(let d=0;d<this.tagtree.length;d++){let e,f=this.tagtree[d],g=this.tagfield[d],h=this.tag.get(g),j=create_object();if("function"!=typeof f){const a=f._filter;if(a&&!a(b))continue;f.constructor===String&&(f=""+f),e=parse_simple(b,f)}else if(e=f(b),!e)continue;if(!h||!e){continue}is_string(e)&&(e=[e]);for(let b,d,f=0;f<e.length;f++)if(b=e[f],!j[b]){j[b]=1;let e;if(e=h.get(b),e?d=e:h.set(b,d=[]),!c||!d.includes(a)){if(2147483647===d.length){const a=new KeystoreArray(d);if(this.fastupdate)for(let b of this.reg.values())b.includes(d)&&(b[b.indexOf(d)]=a);h.set(b,d=a)}if(d.push(a),this.fastupdate){const b=this.reg.get(a);b?b.push(d):this.reg.set(a,[d])}}}}if(this.store&&(!c||!this.store.has(a))){let c;if(this.storetree){c=create_object();for(let a,d=0;d<this.storetree.length;d++){a=this.storetree[d];const e=a._filter;if(e&&!e(b))continue;let f;if("function"==typeof a){if(f=a(b),!f)continue;a=[a._field]}else if(is_string(a)||a.constructor===String){c[a]=b[a];continue}store_value(b,c,a,0,a[0],f)}}this.store.set(a,c||b)}}return this};function store_value(a,b,c,d,e,f){if(a=a[e],d===c.length-1)b[e]=f||a;else if(a)if(is_array(a)){b=b[e]=Array(a.length);for(let e=0;e<a.length;e++)store_value(a,b,c,d,e)}else b=b[e]||(b[e]=create_object()),e=c[++d],store_value(a,b,c,d,e)}function add_index(a,b,c,d,e,f,g,h){if(!(a=a[g]))e.db&&e.remove(f);else if(d===b.length-1){if(is_array(a)){if(c[d]){for(let b=0;b<a.length;b++)e.add(f,a[b],!0,!0);return}a=a.join(" ")}e.add(f,a,h,!0)}else if(is_array(a))for(let g=0;g<a.length;g++)add_index(a,b,c,d,e,f,g,h);else g=b[++d],add_index(a,b,c,d,e,f,g,h)}
\ No newline at end of file
+import{create_object,is_array,is_object,is_string,parse_simple}from"../common.js";import{KeystoreArray}from"../keystore.js";import Document from"../document.js";Document.prototype.add=function(a,b,c){if(is_object(a)&&(b=a,a=parse_simple(b,this.key)),b&&(a||0===a)){if(!c&&this.reg.has(a))return this.update(a,b);for(let d,e=0;e<this.field.length;e++){d=this.tree[e];const f=this.index.get(this.field[e]);if("function"==typeof d){const c=d(b);c&&f.add(a,c,!1,!0)}else{const e=d._filter;if(e&&!e(b))continue;d.constructor===String?d=[""+d]:is_string(d)&&(d=[d]),add_index(b,d,this.marker,0,f,a,d[0],c)}}if(this.tag)for(let d=0;d<this.tagtree.length;d++){let e,f=this.tagtree[d],g=this.tagfield[d],h=this.tag.get(g),j=create_object();if("function"!=typeof f){const a=f._filter;if(a&&!a(b))continue;f.constructor===String&&(f=""+f),e=parse_simple(b,f)}else if(e=f(b),!e)continue;if(!h||!e){continue}is_string(e)&&(e=[e]);for(let b,d,f=0;f<e.length;f++)if(b=e[f],!j[b]){j[b]=1;let e;if(e=h.get(b),e?d=e:h.set(b,d=[]),!c||!d.includes(a)){if(2147483647===d.length){const a=new KeystoreArray(d);if(this.fastupdate)for(let b of this.reg.values())b.includes(d)&&(b[b.indexOf(d)]=a);h.set(b,d=a)}if(d.push(a),this.fastupdate){const b=this.reg.get(a);b?b.push(d):this.reg.set(a,[d])}}}}if(this.store&&(!c||!this.store.has(a))){let c;if(this.storetree){c=create_object();for(let a,d=0;d<this.storetree.length;d++){a=this.storetree[d];const e=a._filter;if(e&&!e(b))continue;let f;if("function"==typeof a){if(f=a(b),!f)continue;a=[a._field]}else if(is_string(a)||a.constructor===String){c[a]=b[a];continue}store_value(b,c,a,0,a[0],f)}}this.store.set(a,c||b)}this.worker&&(this.fastupdate||this.reg.add(a))}return this};function store_value(a,b,c,d,e,f){if(a=a[e],d===c.length-1)b[e]=f||a;else if(a)if(is_array(a)){b=b[e]=Array(a.length);for(let e=0;e<a.length;e++)store_value(a,b,c,d,e)}else b=b[e]||(b[e]=create_object()),e=c[++d],store_value(a,b,c,d,e)}function add_index(a,b,c,d,e,f,g,h){if(!(a=a[g]))e.db&&e.remove(f);else if(d===b.length-1){if(is_array(a)){if(c[d]){for(let b=0;b<a.length;b++)e.add(f,a[b],!0,!0);return}a=a.join(" ")}e.add(f,a,h,!0)}else if(is_array(a))for(let g=0;g<a.length;g++)add_index(a,b,c,d,e,f,g,h);else g=b[++d],add_index(a,b,c,d,e,f,g,h)}
\ No newline at end of file
diff --git a/dist/module-min/serialize.js b/dist/module-min/serialize.js
index 053155f..3a1b4ed 100644
--- a/dist/module-min/serialize.js
+++ b/dist/module-min/serialize.js
@@ -1 +1 @@
-import Index from"./index.js";import Document from"./document.js";import{is_string}from"./common.js";import{IntermediateSearchResults}from"./type.js";const chunk_size_reg=250000,chunk_size_map=5000,chunk_size_ctx=1000;function map_to_json(a,b=0){let c=[],d=[];b&&(b=0|chunk_size_map*(chunk_size_reg/b));for(const e of a.entries())d.push(e),d.length===b&&(c.push(d),d=[]);return d.length&&c.push(d),c}function json_to_map(a,b){b||(b=new Map);for(let c,d=0;d<a.length;d++)c=a[d],b.set(c[0],c[1]);return b}function ctx_to_json(a,b=0){let c=[],d=[];b&&(b=0|chunk_size_ctx*(chunk_size_reg/b));for(const e of a.entries()){const a=e[0],f=e[1];d.push([a,map_to_json(f)[0]]),d.length===b&&(c.push(d),d=[])}return d.length&&c.push(d),c}function json_to_ctx(a,b){b||(b=new Map);for(let c,d,e=0;e<a.length;e++)c=a[e],d=b.get(c[0]),b.set(c[0],json_to_map(c[1],d));return b}function reg_to_json(a){let b=[],c=[];for(const d of a.keys())c.push(d),c.length===chunk_size_reg&&(b.push(c),c=[]);return c.length&&b.push(c),b}function json_to_reg(a,b){b||(b=new Set);for(let c=0;c<a.length;c++)b.add(a[c]);return b}function save(a,b,c,d,e,f,g=0){const h=d&&d.constructor===Array,i=h?d.shift():d;if(!i)return this.export(a,b,e,f+1);const j=a((b?b+".":"")+(g+1)+"."+c,JSON.stringify(i));if(j&&j.then){const i=this;return j.then(function(){return save.call(i,a,b,c,h?d:null,e,f,g+1)})}return save.call(this,a,b,c,h?d:null,e,f,g+1)}export function exportIndex(a,b,c=0,d=0){let e,f;switch(d){case 0:e="reg",f=reg_to_json(this.reg);break;case 1:e="cfg",f=null;break;case 2:e="map",f=map_to_json(this.map,this.reg.size);break;case 3:e="ctx",f=ctx_to_json(this.ctx,this.reg.size);break;default:return;}return save.call(this,a,b,e,f,c,d)}export function importIndex(a,b){if(b){"string"==typeof b&&(b=JSON.parse(b));const c=a.split(".");switch("json"===c[c.length-1]&&c.pop(),a=1<c.length?c[1]:c[0],a){case"cfg":break;case"reg":this.fastupdate=!1,this.reg=json_to_reg(b,this.reg);break;case"map":this.map=json_to_map(b,this.map);break;case"ctx":this.ctx=json_to_ctx(b,this.ctx);}}}export function exportDocument(a,b,c=0,d=0){if(c<this.field.length){const b=this.field[c],e=this.index.get(b),f=e.export(a,b,c,d=1);if(f&&f.then){const d=this;return f.then(function(){return d.export(a,b,c+1)})}return this.export(a,b,c+1)}else{let e,f;switch(d){case 0:e="reg",f=reg_to_json(this.reg),b=null;break;case 1:e="tag",f=ctx_to_json(this.tag,this.reg.size),b=null;break;case 2:e="doc",f=map_to_json(this.store),b=null;break;case 3:e="cfg",f=null,b=null;break;default:return;}return save.call(this,a,b,e,f,c,d)}}export function importDocument(a,b){if(b){"string"==typeof b&&(b=JSON.parse(b));const c=a.split(".");"json"===c[c.length-1]&&c.pop();const d=2<c.length?c[0]:"";if(a=2<c.length?c[2]:c[1],!d)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(d).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";import{IntermediateSearchResults}from"./type.js";const chunk_size_reg=250000,chunk_size_map=5000,chunk_size_ctx=1000;function map_to_json(a,b=0){let c=[],d=[];b&&(b=0|chunk_size_map*(chunk_size_reg/b));for(const e of a.entries())d.push(e),d.length===b&&(c.push(d),d=[]);return d.length&&c.push(d),c}function json_to_map(a,b){b||(b=new Map);for(let c,d=0;d<a.length;d++)c=a[d],b.set(c[0],c[1]);return b}function ctx_to_json(a,b=0){let c=[],d=[];b&&(b=0|chunk_size_ctx*(chunk_size_reg/b));for(const e of a.entries()){const a=e[0],f=e[1];d.push([a,map_to_json(f)[0]]),d.length===b&&(c.push(d),d=[])}return d.length&&c.push(d),c}function json_to_ctx(a,b){b||(b=new Map);for(let c,d,e=0;e<a.length;e++)c=a[e],d=b.get(c[0]),b.set(c[0],json_to_map(c[1],d));return b}function reg_to_json(a){let b=[],c=[];for(const d of a.keys())c.push(d),c.length===chunk_size_reg&&(b.push(c),c=[]);return c.length&&b.push(c),b}function json_to_reg(a,b){b||(b=new Set);for(let c=0;c<a.length;c++)b.add(a[c]);return b}function save(a,b,c,d,e,f,g=0){const h=d&&d.constructor===Array,i=h?d.shift():d;if(!i)return this.export(a,b,e,f+1);const j=a((b?b+".":"")+(g+1)+"."+c,JSON.stringify(i));if(j&&j.then){const i=this;return j.then(function(){return save.call(i,a,b,c,h?d:null,e,f,g+1)})}return save.call(this,a,b,c,h?d:null,e,f,g+1)}export function exportIndex(a,b,c=0,d=0){let e,f;switch(d){case 0:e="reg",f=reg_to_json(this.reg);break;case 1:e="cfg",f=null;break;case 2:e="map",f=map_to_json(this.map,this.reg.size);break;case 3:e="ctx",f=ctx_to_json(this.ctx,this.reg.size);break;default:return;}return save.call(this,a,b,e,f,c,d)}export function importIndex(a,b){if(b){"string"==typeof b&&(b=JSON.parse(b));const c=a.split(".");switch("json"===c[c.length-1]&&c.pop(),3===c.length&&c.shift(),a=1<c.length?c[1]:c[0],a){case"cfg":break;case"reg":this.fastupdate=!1,this.reg=json_to_reg(b,this.reg);break;case"map":this.map=json_to_map(b,this.map);break;case"ctx":this.ctx=json_to_ctx(b,this.ctx);}}}export function exportDocument(a,b,c=0,d=0){if(c<this.field.length){const b=this.field[c],e=this.index.get(b),f=e.export(a,b,c,d=1);if(f&&f.then){const d=this;return f.then(function(){return d.export(a,b,c+1)})}return this.export(a,b,c+1)}else{let e,f;switch(d){case 0:e="reg",f=reg_to_json(this.reg),b=null;break;case 1:e="tag",f=ctx_to_json(this.tag,this.reg.size),b=null;break;case 2:e="doc",f=map_to_json(this.store),b=null;break;case 3:e="cfg",f=null,b=null;break;default:return;}return save.call(this,a,b,e,f,c,d)}}export function importDocument(a,b){const c=a.split(".");"json"===c[c.length-1]&&c.pop();const d=2<c.length?c[0]:"",e=2<c.length?c[2]:c[1];if(this.worker&&d)return this.index.get(d).import(a);if(b)if("string"==typeof b&&(b=JSON.parse(b)),!d)switch(e){case"reg":this.fastupdate=!1,this.reg=json_to_reg(b,this.reg);for(let a,b=0;b<this.field.length;b++)a=this.index.get(this.field[b]),a.fastupdate=!1,a.reg=this.reg;if(this.worker){const b=[],c=this;for(const c of this.index.values())b.push(c.import(a));return Promise.all(b)}break;case"tag":this.tag=json_to_ctx(b,this.tag);break;case"doc":this.store=json_to_map(b,this.store);break;case"cfg":}else return this.index.get(d).import(e,b)}export function serialize(a=!0){if(!this.reg.size)return"";let b="",c="";for(const d of this.reg.keys())c||(c=typeof d),b+=(b?",":"")+("string"==c?"\""+d+"\"":d);b="index.reg=new Set(["+b+"]);";let d="";for(const b of this.map.entries()){const a=b[0],e=b[1];let f="";for(let a,b=0;b<e.length;b++){a=e[b]||[""];let d="";for(let b=0;b<a.length;b++)d+=(d?",":"")+("string"==c?"\""+a[b]+"\"":a[b]);d="["+d+"]",f+=(f?",":"")+d}f="[\""+a+"\",["+f+"]]",d+=(d?",":"")+f}d="index.map=new Map(["+d+"]);";let e="";for(const b of this.ctx.entries()){const a=b[0],d=b[1];for(const b of d.entries()){const d=b[0],f=b[1];let g="";for(let a,b=0;b<f.length;b++){a=f[b]||[""];let d="";for(let b=0;b<a.length;b++)d+=(d?",":"")+("string"==c?"\""+a[b]+"\"":a[b]);d="["+d+"]",g+=(g?",":"")+d}g="new Map([[\""+d+"\",["+g+"]]])",g="[\""+a+"\","+g+"]",e+=(e?",":"")+g}}return e="index.ctx=new Map(["+e+"]);",a?"function inject(index){"+b+d+e+"}":b+d+e}
\ No newline at end of file
diff --git a/dist/module-min/worker.js b/dist/module-min/worker.js
index bfc38cb..8f337dd 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";import apply_async from"./async.js";let pid=0;export default function WorkerIndex(a={}){function b(b){function f(a){a=a.data||a;const b=a.id,c=b&&e.resolver[b];c&&(c(a.msg),delete e.resolver[b])}if(this.worker=b,this.resolver=create_object(),!!this.worker)return(d?this.worker.on("message",f):this.worker.onmessage=f,a.config)?new Promise(function(b){e.resolver[++pid]=function(){b(e)},e.worker.postMessage({id:pid,task:"init",factory:c,options:a})}):(this.worker.postMessage({task:"init",factory:c,options:a}),this)}if(!this||this.constructor!==WorkerIndex)return new WorkerIndex(a);let c="undefined"==typeof self?"undefined"==typeof window?null:window._factory:self._factory;c&&(c=c.toString());const d="undefined"==typeof window,e=this,f=create(c,d,a.worker);return f.then?f.then(function(a){return b.call(e,a)}):b.call(this,f)}register("add"),register("append"),register("search"),register("update"),register("remove"),register("clear"),register("export"),register("import"),!0;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}from"./common.js";import handler from"./worker/handler.js";import apply_async from"./async.js";let pid=0;export default function WorkerIndex(a={}){function b(b){function f(a){a=a.data||a;const b=a.id,c=b&&e.resolver[b];c&&(c(a.msg),delete e.resolver[b])}if(this.worker=b,this.resolver=create_object(),!!this.worker)return(d?this.worker.on("message",f):this.worker.onmessage=f,a.config)?new Promise(function(b){e.resolver[++pid]=function(){b(e)},e.worker.postMessage({id:pid,task:"init",factory:c,options:a})}):(this.worker.postMessage({task:"init",factory:c,options:a}),this)}if(!this||this.constructor!==WorkerIndex)return new WorkerIndex(a);let c="undefined"==typeof self?"undefined"==typeof window?null:window._factory:self._factory;c&&(c=c.toString());const d="undefined"==typeof window,e=this,f=create(c,d,a.worker);return f.then?f.then(function(a){return b.call(e,a)}):b.call(this,f)}register("add"),register("append"),register("search"),register("update"),register("remove"),register("clear"),register("export"),register("import"),apply_async(WorkerIndex.prototype);function register(a){WorkerIndex.prototype[a]=function(){const b=this,c=[].slice.call(arguments),d=c[c.length-1];let e;"function"==typeof d&&(e=d,c.pop());const f=new Promise(function(d){"export"===a&&"function"==typeof c[0]&&(c[0]=null),b.resolver[++pid]=d,b.worker.postMessage({task:a,id:pid,args:c})});return e?(f.then(e),this):f}}function create(a,b,c){let d;return d=b?"undefined"==typeof module?(0,eval)("import(\"worker_threads\").then(function(worker){ return new worker[\"Worker\"]((1,eval)(\"import.meta.dirname\") + \"/node/node.mjs\"); })"):(0,eval)("new (require(\"worker_threads\")[\"Worker\"])(__dirname + \"/node/node.js\")"):a?new window.Worker(URL.createObjectURL(new Blob(["onmessage="+handler.toString()],{type:"text/javascript"}))):new window.Worker("string"==typeof c?c:(1,eval)("import.meta.url").replace("/worker.js","/worker/worker.js").replace("flexsearch.bundle.module.min.js","module/worker/worker.js"),{type:"module"}),d}
\ No newline at end of file
diff --git a/dist/module-min/worker/handler.js b/dist/module-min/worker/handler.js
index f0a3473..0553009 100644
--- a/dist/module-min/worker/handler.js
+++ b/dist/module-min/worker/handler.js
@@ -1 +1 @@
-import Index from"../index.js";import{IndexOptions}from"../type.js";let index,options;export default(async function(a){a=a.data;const b=a.task,c=a.id;let d=a.args;switch(b){case"init":options=a.options||{};let e=options.config;e&&(options=options);const f=a.factory;f?(Function("return "+f)()(self),index=new self.FlexSearch.Index(options),delete self.FlexSearch):index=new Index(options),postMessage({id:c});break;default:let g;"export"===b&&(d=[options.export]);"import"===b?await options.import.call(index,index):(g=index[b].apply(index,d),g.then&&(g=await g));postMessage("search"===b?{id:c,msg:g}:{id:c});}});
\ No newline at end of file
+import Index from"../index.js";import{IndexOptions}from"../type.js";let index,options;export default(async function(a){a=a.data;const b=a.task,c=a.id;let d=a.args;switch(b){case"init":options=a.options||{};let e=options.config;e&&(options=options);const f=a.factory;f?(Function("return "+f)()(self),index=new self.FlexSearch.Index(options),delete self.FlexSearch):index=new Index(options),postMessage({id:c});break;default:let g;if("export"===b&&(d[1]?(d[0]=options.export,d[2]=0,d[3]=1):d=null),"import"!==b)g=d&&index[b].apply(index,d),g&&g.then&&(g=await g);else if(d[0]){const a=await options.import.call(index,d[0]);index.import(d[0],a)}postMessage("search"===b?{id:c,msg:g}:{id:c});}});
\ No newline at end of file
diff --git a/dist/module-min/worker/node.js b/dist/module-min/worker/node.js
index 8df0b36..649e716 100644
--- a/dist/module-min/worker/node.js
+++ b/dist/module-min/worker/node.js
@@ -1 +1 @@
-const{parentPort}=require("worker_threads"),{Index}=require("flexsearch");let index,options;parentPort.on("message",async function(a){const b=a.task,c=a.id;let d=a.args;switch(b){case"init":options=a.options||{};let e=options.config;e&&(options=Object.assign({},options,require(e)),delete options.worker),index=new Index(options),parentPort.postMessage({id:c});break;default:let f;if("export"===b){if(!options.export||"function"!=typeof options.export)throw new Error("Either no extern configuration provided for the Worker-Index or no method was defined on the config property \"export\".");d=[options.export]}if("import"===b){if(!options.import||"function"!=typeof options.import)throw new Error("Either no extern configuration provided for the Worker-Index or no method was defined on the config property \"import\".");await options.import.call(index,index)}else f=index[b].apply(index,d),f.then&&(f=await f);parentPort.postMessage("search"===b?{id:c,msg:f}:{id:c});}});
\ No newline at end of file
+const{parentPort}=require("worker_threads"),{Index}=require("flexsearch");let index,options;parentPort.on("message",async function(a){const b=a.task,c=a.id;let d=a.args;switch(b){case"init":options=a.options||{};let e=options.config;e&&(options=Object.assign({},options,require(e)),delete options.worker),index=new Index(options),parentPort.postMessage({id:c});break;default:let f;if("export"===b){if(!options.export||"function"!=typeof options.export)throw new Error("Either no extern configuration provided for the Worker-Index or no method was defined on the config property \"export\".");d[1]?(d[0]=options.export,d[2]=0,d[3]=1):d=null}if("import"===b){if(!options.import||"function"!=typeof options.import)throw new Error("Either no extern configuration provided for the Worker-Index or no method was defined on the config property \"import\".");if(d[0]){const a=await options.import.call(index,d[0]);index.import(d[0],a)}}else f=d&&index[b].apply(index,d),f&&f.then&&(f=await f);parentPort.postMessage("search"===b?{id:c,msg:f}:{id:c});}});
\ No newline at end of file
diff --git a/dist/module/document/add.js b/dist/module/document/add.js
index ed8e2c2..fedc026 100644
--- a/dist/module/document/add.js
+++ b/dist/module/document/add.js
@@ -156,6 +156,10 @@ Document.prototype.add = function (id, content, _append) {
 
             this.store.set(id, payload || content);
         }
+
+        if (this.worker) {
+            this.fastupdate || this.reg.add(id);
+        }
     }
 
     return this;
diff --git a/dist/module/encoder.js b/dist/module/encoder.js
index 661b1da..3a730c6 100644
--- a/dist/module/encoder.js
+++ b/dist/module/encoder.js
@@ -87,9 +87,7 @@ Encoder.prototype.assign = function (options) {
      * pre-processing string input
      * @type {Function|boolean}
      */
-    this.normalize = /** @type {Function|boolean} */merge_option(options.normalize, /* tag? */ /* stringify */ /* stringify */ /* single param */ /* skip update: */ /* append: */ /* skip update: */
-    /* skip_update: */
-    /* skip deletion */!0 /*await rows.hasNext()*/ /*await rows.hasNext()*/ /*await rows.hasNext()*/, this.normalize);
+    this.normalize = /** @type {Function|boolean} */merge_option(options.normalize, /* tag? */ /* stringify */ /* stringify */ /* single param */ /* skip update: */ /* append: */ /* skip update: */ /* skip_update: */ /* skip deletion */!0 /*await rows.hasNext()*/ /*await rows.hasNext()*/ /*await rows.hasNext()*/, this.normalize);
 
     // {
     //     letter: true,
@@ -197,7 +195,8 @@ Encoder.prototype.assign = function (options) {
     // auto-balanced cache
     this.cache = tmp = merge_option(options.cache, !0, this.cache);
     if (tmp) {
-        this.timer = null;this.cache_size = "number" == typeof tmp ? tmp : 2e5;
+        this.timer = null;
+        this.cache_size = "number" == typeof tmp ? tmp : 2e5;
         this.cache_enc = new Map();
         this.cache_term = new Map();
         this.cache_enc_length = 128;
diff --git a/dist/module/index.js b/dist/module/index.js
index a774d57..76e715e 100644
--- a/dist/module/index.js
+++ b/dist/module/index.js
@@ -43,8 +43,7 @@ export default function Index(options, _register) {
     /** @type Encoder */
     this.encoder = encoder.encode ? encoder : "object" == typeof encoder ? new Encoder( /** @type {EncoderOptions} */encoder) : { encode: encoder };
 
-    this.compress = options.compress || options.compression ||
-    /* suggest */ /* append: */ /* enrich */!1;
+    this.compress = options.compress || options.compression || /* suggest */ /* append: */ /* enrich */!1;
 
 
     this.resolution = options.resolution || 9;
diff --git a/dist/module/serialize.js b/dist/module/serialize.js
index 111be1e..54b09ca 100644
--- a/dist/module/serialize.js
+++ b/dist/module/serialize.js
@@ -1,3 +1,4 @@
+
 import Index from "./index.js";
 import Document from "./document.js";
 import { is_string } from "./common.js";
@@ -88,7 +89,7 @@ function json_to_ctx(json, ctx) {
 }
 
 /**
- * @param {Set<string|number>} reg
+ * @param {Set<string|number>|Map<Array<string|number>>} reg
  * @return {Array<Array<string|number>>}
  */
 function reg_to_json(reg) {
@@ -217,6 +218,9 @@ export function importIndex(key, data) {
     if ("json" === split[split.length - 1]) {
         split.pop();
     }
+    if (3 === split.length) {
+        split.shift();
+    }
     key = 1 < split.length ? split[1] : split[0];
 
     switch (key) {
@@ -319,6 +323,19 @@ export function exportDocument(callback, _field, _index_doc = 0, _index_obj = 0)
 
 export function importDocument(key, data) {
 
+    const split = key.split(".");
+    if ("json" === split[split.length - 1]) {
+        split.pop();
+    }
+    const field = 2 < split.length ? split[0] : "",
+          ref = 2 < split.length ? split[2] : split[1];
+
+
+    // trigger the import for worker field indexes
+    if (this.worker && field) {
+        return this.index.get(field).import(key);
+    }
+
     if (!data) {
         return;
     }
@@ -326,16 +343,9 @@ export function importDocument(key, data) {
         data = /** @type {Array<Object>} */JSON.parse( /** @type {string} */data);
     }
 
-    const split = key.split(".");
-    if ("json" === split[split.length - 1]) {
-        split.pop();
-    }
-    const field = 2 < split.length ? split[0] : "";
-    key = 2 < split.length ? split[2] : split[1];
-
     if (!field) {
 
-        switch (key) {
+        switch (ref) {
 
             case "reg":
 
@@ -349,6 +359,22 @@ export function importDocument(key, data) {
                     idx.reg = this.reg;
                 }
 
+                // trigger the import for worker field indexes
+                if (this.worker) {
+                    const promises = [],
+                          self = this;
+
+
+                    for (const index of this.index.values()) {
+                        // const ref = item[0];
+                        // const index = item[1];
+                        promises.push(index.import(key));
+                        //this.index.get(field).import(key);
+                    }
+
+                    return Promise.all(promises);
+                }
+
                 break;
 
             case "tag":
@@ -368,7 +394,7 @@ export function importDocument(key, data) {
         }
     } else {
 
-        return this.index.get(field).import(key, data);
+        return this.index.get(field).import(ref, data);
     }
 }
 
diff --git a/dist/module/worker.js b/dist/module/worker.js
index be7f1ec..1efa946 100644
--- a/dist/module/worker.js
+++ b/dist/module/worker.js
@@ -1,6 +1,6 @@
 
 import { IndexOptions } from "./type.js";
-import { create_object, is_function, is_object, is_string } from "./common.js";
+import { create_object } from "./common.js";
 import handler from "./worker/handler.js";
 import apply_async from "./async.js";
 
@@ -81,7 +81,6 @@ export default function WorkerIndex(options = /** @type IndexOptions */{}) {
     }
 
     const worker = create(factory, is_node_js, options.worker);
-    //worker.worker = true;
     return worker.then ? worker.then(function (worker) {
         return init.call(_self, worker);
     }) : init.call(this, worker);
@@ -96,36 +95,40 @@ register("clear");
 register("export");
 register("import");
 
+apply_async(WorkerIndex.prototype);
+
+
 function register(key) {
 
-    WorkerIndex.prototype[key] = WorkerIndex.prototype[key + "Async"] = async function () {
+    WorkerIndex.prototype[key] = function () {
         const self = this,
               args = [].slice.call(arguments),
               arg = args[args.length - 1];
 
         let callback;
 
-        if (is_function(arg)) {
+        if ("function" == typeof arg) {
             callback = arg;
-            args.splice(args.length - 1, 1);
+            args.pop();
         }
 
         const promise = new Promise(function (resolve) {
-            //setTimeout(function(){
+            if ("export" === key && "function" == typeof args[0]) {
+                // remove function handler
+                args[0] = null;
+            }
             self.resolver[++pid] = resolve;
             self.worker.postMessage({
                 task: key,
                 id: pid,
                 args: args
             });
-            //});
         });
 
         if (callback) {
             promise.then(callback);
             return this;
         } else {
-
             return promise;
         }
     };
@@ -134,8 +137,7 @@ function register(key) {
 function create(factory, is_node_js, worker_path) {
 
     let worker = is_node_js ?
-    // This eval will be removed when compiling, it isn't there in final build
-
+    // This eval will be removed when compiling
     "undefined" != typeof module ? (0, eval)('new (require("worker_threads")["Worker"])(__dirname + "/node/node.js")')
     //: (0,eval)('new ((await import("worker_threads"))["Worker"])(import.meta.dirname + "/worker/node.mjs")')
     //: (0,eval)('new ((await import("worker_threads"))["Worker"])((1,eval)(\"import.meta.dirname\") + "/node/node.mjs")')
@@ -143,7 +145,8 @@ function create(factory, is_node_js, worker_path) {
     //: import("worker_threads").then(function(worker){ return new worker["Worker"](import.meta.dirname + "/worker/node.mjs"); })
 
     //eval('new (require("worker_threads")["Worker"])(__dirname + "/node/node.js")')
-    : factory ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + handler.toString()], { type: "text/javascript" }))) : new window.Worker(is_string(worker_path) ? worker_path : import.meta.url.replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", "module/worker/worker.js") /*"worker/worker.js"*/, { type: "module" });
+    : factory ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + handler.toString()], { type: "text/javascript" }))) : new window.Worker("string" == typeof worker_path ? worker_path : import.meta.url.replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", "module/worker/worker.js") /*"worker/worker.js"*/
+    , { type: "module" });
 
     return worker;
 }
\ No newline at end of file
diff --git a/dist/module/worker/handler.js b/dist/module/worker/handler.js
index c21b149..2957005 100644
--- a/dist/module/worker/handler.js
+++ b/dist/module/worker/handler.js
@@ -51,13 +51,21 @@ export default (async function (data) {
             let message;
 
             if ("export" === task) {
-                args = [options.export];
+                // skip non-field indexes
+                if (!args[1]) args = null;else {
+                    args[0] = options.export;
+                    args[2] = 0;
+                    args[3] = 1; // skip reg
+                }
             }
             if ("import" === task) {
-                await options.import.call(index, index);
+                if (args[0]) {
+                    const data = await options.import.call(index, args[0]);
+                    index.import(args[0], data);
+                }
             } else {
-                message = index[task].apply(index, args);
-                if (message.then) {
+                message = args && index[task].apply(index, args);
+                if (message && message.then) {
                     message = await message;
                 }
             }
diff --git a/dist/module/worker/node.js b/dist/module/worker/node.js
index 704bc49..8b8b3d8 100644
--- a/dist/module/worker/node.js
+++ b/dist/module/worker/node.js
@@ -1,3 +1,7 @@
+/*
+ * Node.js Worker (CommonJS)
+ * This file is a standalone file and isn't being a part of the build/bundle
+ */
 const { parentPort } = require("worker_threads"),
       { Index } = require("flexsearch");
 //const { join } = require("path");
@@ -41,16 +45,24 @@ parentPort.on("message", async function (data) {
                 if (!options.export || "function" != typeof options.export) {
                     throw new Error("Either no extern configuration provided for the Worker-Index or no method was defined on the config property \"export\".");
                 }
-                args = [options.export];
+                // skip non-field indexes
+                if (!args[1]) args = null;else {
+                    args[0] = options.export;
+                    args[2] = 0;
+                    args[3] = 1; // skip reg
+                }
             }
             if ("import" === task) {
                 if (!options.import || "function" != typeof options.import) {
                     throw new Error("Either no extern configuration provided for the Worker-Index or no method was defined on the config property \"import\".");
                 }
-                await options.import.call(index, index);
+                if (args[0]) {
+                    const data = await options.import.call(index, args[0]);
+                    index.import(args[0], data);
+                }
             } else {
-                message = index[task].apply(index, args);
-                if (message.then) {
+                message = args && index[task].apply(index, args);
+                if (message && message.then) {
                     message = await message;
                 }
             }
diff --git a/dist/node/node.js b/dist/node/node.js
index 1402938..a29bff4 100644
--- a/dist/node/node.js
+++ b/dist/node/node.js
@@ -1,3 +1,7 @@
+/*
+ * Node.js Worker (CommonJS)
+ * This file is a standalone file and isn't being a part of the build/bundle
+ */
 const { parentPort } = require("worker_threads");
 //const { join } = require("path");
 // Test Path
@@ -41,17 +45,26 @@ parentPort.on("message", async function(data){
                 if(!options.export || typeof options.export !== "function"){
                     throw new Error("Either no extern configuration provided for the Worker-Index or no method was defined on the config property \"export\".");
                 }
-                args = [options.export];
+                // skip non-field indexes
+                if(!args[1]) args = null;
+                else{
+                    args[0] = options.export;
+                    args[2] = 0;
+                    args[3] = 1; // skip reg
+                }
             }
             if(task === "import"){
                 if(!options.import || typeof options.import !== "function"){
                     throw new Error("Either no extern configuration provided for the Worker-Index or no method was defined on the config property \"import\".");
                 }
-                await options.import.call(index, index);
+                if(args[0]){
+                    const data = await options.import.call(index, args[0]);
+                    index.import(args[0], data);
+                }
             }
             else{
-                message = index[task].apply(index, args);
-                if(message.then){
+                message = args && index[task].apply(index, args);
+                if(message && message.then){
                     message = await message;
                 }
             }
diff --git a/dist/node/node.mjs b/dist/node/node.mjs
index 14a1c52..ccdb210 100644
--- a/dist/node/node.mjs
+++ b/dist/node/node.mjs
@@ -1,3 +1,7 @@
+/*
+ * Node.js Worker (Standalone, ESM)
+ * This file is a standalone file and isn't being a part of the build/bundle
+ */
 import { parentPort } from "worker_threads";
 import { join } from "path";
 // Test Path
@@ -43,17 +47,26 @@ parentPort.on("message", async function(data){
                 if(!options.export || typeof options.export !== "function"){
                     throw new Error("Either no extern configuration provided for the Worker-Index or no method was defined on the config property \"export\".");
                 }
-                args = [options.export];
+                // skip non-field indexes
+                if(!args[1]) args = null;
+                else{
+                    args[0] = options.export;
+                    args[2] = 0;
+                    args[3] = 1; // skip reg
+                }
             }
             if(task === "import"){
                 if(!options.import || typeof options.import !== "function"){
                     throw new Error("Either no extern configuration provided for the Worker-Index or no method was defined on the config property \"import\".");
                 }
-                await options.import.call(index, index);
+                if(args[0]){
+                    const data = await options.import.call(index, args[0]);
+                    index.import(args[0], data);
+                }
             }
             else{
-                message = index[task].apply(index, args);
-                if(message.then){
+                message = args && index[task].apply(index, args);
+                if(message && message.then){
                     message = await message;
                 }
             }
diff --git a/doc/worker.md b/doc/worker.md
index 49cbc69..260848e 100644
--- a/doc/worker.md
+++ b/doc/worker.md
@@ -127,7 +127,169 @@ The used index configuration has 2 fields (using bidirectional context of `depth
 A non-Worker Document index requires 181 seconds to index all contents.<br>
 The Worker index just takes 32 seconds to index them all, by processing every field and tag in parallel. For such large content it is a quite impressive result.
 
-### CSP-friendly Worker (Browser)
+## Export / Import Worker Indexes (Node.js)
+
+Worker will save/load their data dedicated and does not need the message channel for the data transfer.
+
+### Basic Worker Index
+
+> This feature follows the strategy of using [Extern Worker Configuration](#extern-worker-configuration) in combination with [Basic Export Import](../example/nodejs-commonjs/basic-export-import).
+
+Example (CommonJS): [basic-worker-export-import](../example/nodejs-commonjs/basic-worker-export-import)<br>
+Example (ESM): [basic-worker-export-import](../example/nodejs-esm/basic-worker-export-import)
+
+Provide the index configuration and keep it, because it isn't stored. Provide a parameter `config` which is including the filepath to the extern configuration file:
+
+```js
+const dirname = import.meta.dirname;
+const config = {
+    tokenize: "forward",
+    config: dirname + "/config.js"
+};
+```
+
+> Any changes you made to the configuration will almost require a full re-index.
+
+Provide the extern configuration file e.g. `/config.js` as a default export including the methods `export` and `import`:
+
+```js
+import { promises as fs } from "fs";
+
+export default {
+    tokenize: "forward",
+    export: async function(key, data){
+        // like the usual export write files by key + data
+        await fs.writeFile("./export/" + key, data, "utf8");
+    },
+    import: async function(index){
+        // get the file contents of the export directory
+        let files = await fs.readdir("./export/");
+        files = await Promise.all(files);
+        // loop through the files and push their contents to the index
+        // by also passing the filename as the first parameter
+        for(let i = 0; i < files.length; i++){
+            const data = await fs.readFile("./export/" + files[i], "utf8");
+            index.import(files[i], data);
+        }
+    }
+};
+```
+
+Create your index by assigning the configuration file from above:
+
+```js
+import { Worker as WorkerIndex } from "flexsearch/esm";
+const index = await new WorkerIndex(config);
+// add data to the index
+// ...
+```
+
+Export the index:
+
+```js
+await index.export();
+```
+
+Import the index:
+
+```js
+// create the same type of index you have used by .export()
+// along with the same configuration
+const index = await new WorkerIndex(config);
+await index.import();
+```
+
+### Document Worker Index
+
+> This feature follows the strategy of using [Extern Worker Configuration](#extern-worker-configuration) in combination with [Document Export Import](../example/nodejs-esm/document-export-import).
+
+Document Worker exports all their feature including:
+
+- Multi-Tag Indexes
+- Context-Search Indexes
+- Document-Store
+
+Example (CommonJS): [document-worker-export-import](../example/nodejs-commonjs/document-worker-export-import)<br>
+Example (ESM): [document-worker-export-import](../example/nodejs-esm/document-worker-export-import)
+
+Provide the index configuration and keep it, because it isn't stored. Provide a parameter `config` which is including the filepath to the extern configuration file:
+
+```js
+const dirname = import.meta.dirname;
+const config = {
+    worker: true,
+    document: {
+        id: "tconst",
+        store: true,
+        index: [{
+            field: "primaryTitle",
+            config: dirname + "/config.primaryTitle.js"
+        },{
+            field: "originalTitle",
+            config: dirname + "/config.originalTitle.js"
+        }],
+        tag: [{
+            field: "startYear"
+        },{
+            field: "genres"
+        }]
+    }
+};
+```
+
+> Any changes you made to the configuration will almost require a full re-index.
+
+Provide the extern configuration file as a default export including the methods `export` and `import`:
+
+```js
+import { promises as fs } from "fs";
+
+export default {
+    tokenize: "forward",
+    export: async function(key, data){
+        // like the usual export write files by key + data
+        await fs.writeFile("./export/" + key, data, "utf8");
+    },
+    import: async function(file){
+        // instead of looping you will get the filename as 2nd paramter
+        // just return the loaded contents as a string
+        return await fs.readFile("./export/" + file, "utf8");
+    }
+};
+```
+
+Create your index by assigning the configuration file from above:
+
+```js
+import { Document } from "flexsearch/esm";
+const document = await new Document(config);
+// add data to the index
+// ...
+```
+
+Export the index by providing a key-data handler:
+
+```js
+await document.export(async function(key, data){
+    await fs.writeFile("./export/" + key, data, "utf8");
+});
+```
+
+Import the index:
+
+```js
+const files = await fs.readdir("./export/");
+// create the same type of index you have used by .export()
+// along with the same configuration
+const document = await new Document(config);
+await Promise.all(files.map(async file => {
+    const data = await fs.readFile("./export/" + file, "utf8");
+    // call import (async)
+    await document.import(file, data);
+}));
+```
+
+## CSP-friendly Worker (Browser)
 
 When just using worker by passing the option `worker: true`, the worker will be created by code generation under the hood. This might have issues when using strict CSP settings.
 
diff --git a/example/nodejs-commonjs/.document-worker-persistent/index.js b/example/nodejs-commonjs/.document-worker-persistent/index.js
index db28b94..913adf0 100644
--- a/example/nodejs-commonjs/.document-worker-persistent/index.js
+++ b/example/nodejs-commonjs/.document-worker-persistent/index.js
@@ -24,7 +24,7 @@ const data = require(__dirname + "/data.json");
                 config: __dirname + "/config.primaryTitle.js"
             },{
                 field: "originalTitle",
-                config: __dirname + "/config.primaryTitle.js"
+                config: __dirname + "/config.originalTitle.js"
             }],
             tag: [{
                 field: "startYear"
diff --git a/example/nodejs-commonjs/basic-worker-export-import/index.js b/example/nodejs-commonjs/basic-worker-export-import/index.js
index 966c04e..b026bb6 100644
--- a/example/nodejs-commonjs/basic-worker-export-import/index.js
+++ b/example/nodejs-commonjs/basic-worker-export-import/index.js
@@ -26,9 +26,9 @@ const config = {
     ];
 
     // add test data
-    data.forEach((item, id) => {
-        index.add(id, item);
-    });
+    for(let i = 0; i < data.length; i++){
+        await index.addAsync(i, data[i]);
+    }
 
     // perform query
     let result = await index.search({
diff --git a/example/nodejs-commonjs/basic-worker-export-import/package.json b/example/nodejs-commonjs/basic-worker-export-import/package.json
index 340dea6..df59907 100644
--- a/example/nodejs-commonjs/basic-worker-export-import/package.json
+++ b/example/nodejs-commonjs/basic-worker-export-import/package.json
@@ -1,6 +1,6 @@
 {
   "name": "nodejs-commonjs-basic-worker-extern-config",
   "dependencies": {
-    "flexsearch": "^0.8.105"
+    "flexsearch": "github:nextapps-de/flexsearch"
   }
 }
diff --git a/example/nodejs-commonjs/document-export-import/index.js b/example/nodejs-commonjs/document-export-import/index.js
index 1f5dd4c..0b89cf7 100644
--- a/example/nodejs-commonjs/document-export-import/index.js
+++ b/example/nodejs-commonjs/document-export-import/index.js
@@ -60,6 +60,7 @@ const fs = require("fs").promises;
     // -----------------------
 
     await fs.mkdir("./export/").catch(e => {});
+    // call export
     await document.export(async function(key, data){
         await fs.writeFile("./export/" + key, data, "utf8");
     });
@@ -75,7 +76,8 @@ const fs = require("fs").promises;
     const files = await fs.readdir("./export/");
     await Promise.all(files.map(async file => {
         const data = await fs.readFile("./export/" + file, "utf8");
-        await document.import(file, data);
+        // call import
+        document.import(file, data);
     }))
 
     // perform query
diff --git a/example/nodejs-commonjs/document-worker-export-import/README.md b/example/nodejs-commonjs/document-worker-export-import/README.md
new file mode 100644
index 0000000..24ee65e
--- /dev/null
+++ b/example/nodejs-commonjs/document-worker-export-import/README.md
@@ -0,0 +1,7 @@
+```bash
+npm install
+```
+
+```bash
+node index.js
+```
\ No newline at end of file
diff --git a/example/nodejs-commonjs/document-worker-export-import/config.originalTitle.js b/example/nodejs-commonjs/document-worker-export-import/config.originalTitle.js
new file mode 100644
index 0000000..7590a72
--- /dev/null
+++ b/example/nodejs-commonjs/document-worker-export-import/config.originalTitle.js
@@ -0,0 +1,30 @@
+const { Encoder, Charset } = require("flexsearch");
+const EnglishPreset  = require("flexsearch/lang/en");
+const fs = require("fs").promises;
+
+(async function(){
+    await fs.mkdir("./export/").catch(e => {});
+}());
+
+module.exports = {
+    tokenize: "forward",
+    encoder: new Encoder(
+        Charset.LatinBalance,
+        EnglishPreset,
+        {
+            normalize: function(str){
+                return str.toLowerCase();
+            },
+            filter: false,
+            minlength: 3
+        }
+    ),
+    export: async function(key, data){
+
+        await fs.writeFile("./export/" + key, data, "utf8");
+    },
+    import: async function(file){
+
+        return await fs.readFile("./export/" + file, "utf8");
+    }
+};
\ No newline at end of file
diff --git a/example/nodejs-commonjs/document-worker-export-import/config.primaryTitle.js b/example/nodejs-commonjs/document-worker-export-import/config.primaryTitle.js
new file mode 100644
index 0000000..7590a72
--- /dev/null
+++ b/example/nodejs-commonjs/document-worker-export-import/config.primaryTitle.js
@@ -0,0 +1,30 @@
+const { Encoder, Charset } = require("flexsearch");
+const EnglishPreset  = require("flexsearch/lang/en");
+const fs = require("fs").promises;
+
+(async function(){
+    await fs.mkdir("./export/").catch(e => {});
+}());
+
+module.exports = {
+    tokenize: "forward",
+    encoder: new Encoder(
+        Charset.LatinBalance,
+        EnglishPreset,
+        {
+            normalize: function(str){
+                return str.toLowerCase();
+            },
+            filter: false,
+            minlength: 3
+        }
+    ),
+    export: async function(key, data){
+
+        await fs.writeFile("./export/" + key, data, "utf8");
+    },
+    import: async function(file){
+
+        return await fs.readFile("./export/" + file, "utf8");
+    }
+};
\ No newline at end of file
diff --git a/example/nodejs-commonjs/document-worker-export-import/data.json b/example/nodejs-commonjs/document-worker-export-import/data.json
new file mode 100644
index 0000000..1fd5660
--- /dev/null
+++ b/example/nodejs-commonjs/document-worker-export-import/data.json
@@ -0,0 +1,141 @@
+[
+  {
+    "tconst": "tt0000001",
+    "titleType": "short",
+    "primaryTitle": "Carmencita",
+    "originalTitle": "Carmencita",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000002",
+    "titleType": "short",
+    "primaryTitle": "Le clown et ses chiens",
+    "originalTitle": "Le clown et ses chiens",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "5",
+    "genres": [
+      "Animation",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000003",
+    "titleType": "short",
+    "primaryTitle": "Pauvre Pierrot",
+    "originalTitle": "Pauvre Pierrot",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "4",
+    "genres": [
+      "Animation",
+      "Comedy",
+      "Romance"
+    ]
+  },
+  {
+    "tconst": "tt0000004",
+    "titleType": "short",
+    "primaryTitle": "Un bon bock",
+    "originalTitle": "Un bon bock",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "12",
+    "genres": [
+      "Animation",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000005",
+    "titleType": "short",
+    "primaryTitle": "Blacksmith Scene",
+    "originalTitle": "Blacksmith Scene",
+    "isAdult": 0,
+    "startYear": "1893",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Comedy",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000006",
+    "titleType": "short",
+    "primaryTitle": "Chinese Opium Den",
+    "originalTitle": "Chinese Opium Den",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000007",
+    "titleType": "short",
+    "primaryTitle": "Corbett and Courtney Before the Kinetograph",
+    "originalTitle": "Corbett and Courtney Before the Kinetograph",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Short",
+      "Sport"
+    ]
+  },
+  {
+    "tconst": "tt0000008",
+    "titleType": "short",
+    "primaryTitle": "Edison Kinetoscopic Record of a Sneeze",
+    "originalTitle": "Edison Kinetoscopic Record of a Sneeze",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000009",
+    "titleType": "movie",
+    "primaryTitle": "Miss Jerry",
+    "originalTitle": "Miss Jerry",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "45",
+    "genres": [
+      "Romance"
+    ]
+  },
+  {
+    "tconst": "tt0000010",
+    "titleType": "short",
+    "primaryTitle": "Leaving the Factory",
+    "originalTitle": "La sortie de l'usine Lumière à Lyon",
+    "isAdult": 0,
+    "startYear": "1895",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  }
+]
\ No newline at end of file
diff --git a/example/nodejs-commonjs/document-worker-export-import/index.js b/example/nodejs-commonjs/document-worker-export-import/index.js
new file mode 100644
index 0000000..cafc93c
--- /dev/null
+++ b/example/nodejs-commonjs/document-worker-export-import/index.js
@@ -0,0 +1,102 @@
+const { Document } = require("flexsearch");
+const { promises: fs } = require("fs");
+
+// loading test data
+const data = require(__dirname + "/data.json");
+
+// you will need to keep the index configuration
+// they will not export, also every change to the
+// configuration requires a full re-index
+const config = {
+    worker: true,
+    document: {
+        id: "tconst",
+        store: true,
+        index: [{
+            field: "primaryTitle",
+            config: __dirname + "/config.primaryTitle.js"
+        },{
+            field: "originalTitle",
+            config: __dirname + "/config.originalTitle.js"
+        }],
+        tag: [{
+            field: "startYear"
+        },{
+            field: "genres"
+        }]
+    }
+};
+
+(async function(){
+
+    // create the document and await (!) for the instance response
+    let document = await new Document(config);
+
+    // add test data
+    for(let i = 0; i < data.length; i++){
+        await document.add(data[i]);
+    }
+
+    // perform a query
+    let result = await document.search({
+        query: "karmen",
+        tag: {
+            "startYear": "1894",
+            "genres": [
+                "Documentary",
+                "Short"
+            ]
+        },
+        suggest: true,
+        enrich: true,
+        merge: true
+    });
+
+    console.log(result);
+
+    // -----------------------
+    // EXPORT
+    // -----------------------
+
+    // create folders for the export
+    // it should be empty before export
+    await fs.mkdir("./export/").catch(e => {});
+
+    await document.export(async function(key, data){
+        await fs.writeFile("./export/" + key, data, "utf8");
+    });
+
+    // -----------------------
+    // IMPORT
+    // -----------------------
+
+    // create the same type of index you have used by .export()
+    // along with the same configuration
+    document = await new Document(config);
+
+    // load them in parallel
+    const files = await fs.readdir("./export/");
+    await Promise.all(files.map(async file => {
+        const data = await fs.readFile("./export/" + file, "utf8");
+        await document.import(file, data);
+    }));
+
+    // perform a query
+    result = await document.search({
+        query: "karmen",
+        tag: {
+            "startYear": "1894",
+            "genres": [
+                "Documentary",
+                "Short"
+            ]
+        },
+        suggest: true,
+        enrich: true,
+        merge: true
+    });
+
+    console.log("-------------------------------------");
+    console.log(result);
+
+}());
diff --git a/example/nodejs-commonjs/document-worker-export-import/package.json b/example/nodejs-commonjs/document-worker-export-import/package.json
new file mode 100644
index 0000000..e04e4ba
--- /dev/null
+++ b/example/nodejs-commonjs/document-worker-export-import/package.json
@@ -0,0 +1,6 @@
+{
+  "name": "nodejs-commonjs-document-worker-export-import",
+  "dependencies": {
+    "flexsearch": "github:nextapps-de/flexsearch"
+  }
+}
diff --git a/example/nodejs-commonjs/document-worker-extern-config/index.js b/example/nodejs-commonjs/document-worker-extern-config/index.js
index 08c5f43..55c729a 100644
--- a/example/nodejs-commonjs/document-worker-extern-config/index.js
+++ b/example/nodejs-commonjs/document-worker-extern-config/index.js
@@ -16,7 +16,7 @@ const data = require(__dirname + "/data.json");
                 config: __dirname + "/config.primaryTitle.js"
             },{
                 field: "originalTitle",
-                config: __dirname + "/config.primaryTitle.js"
+                config: __dirname + "/config.originalTitle.js"
             }],
             tag: [{
                 field: "startYear"
diff --git a/example/nodejs-esm/basic-worker-export-import/index.js b/example/nodejs-esm/basic-worker-export-import/index.js
index eafd40d..67f7ab3 100644
--- a/example/nodejs-esm/basic-worker-export-import/index.js
+++ b/example/nodejs-esm/basic-worker-export-import/index.js
@@ -27,9 +27,9 @@ const config = {
     ];
 
     // add test data
-    data.forEach((item, id) => {
-        index.add(id, item);
-    });
+    for(let i = 0; i < data.length; i++){
+        await index.addAsync(i, data[i]);
+    }
 
     // perform query
     let result = await index.search({
@@ -45,9 +45,7 @@ const config = {
     // EXPORT
     // -----------------------
 
-    await index.export(function(){
-        // do nothing here
-    });
+    await index.export();
 
     // -----------------------
     // IMPORT
diff --git a/example/nodejs-esm/basic-worker-export-import/package.json b/example/nodejs-esm/basic-worker-export-import/package.json
index c179cf9..cebffca 100644
--- a/example/nodejs-esm/basic-worker-export-import/package.json
+++ b/example/nodejs-esm/basic-worker-export-import/package.json
@@ -1,7 +1,7 @@
 {
-  "name": "nodejs-esm-basic-worker-extern-config",
+  "name": "nodejs-esm-basic-worker-export-import",
   "type": "module",
   "dependencies": {
-    "flexsearch": "^0.8.105"
+    "flexsearch": "github:nextapps-de/flexsearch"
   }
 }
diff --git a/example/nodejs-esm/document-export-import/index.js b/example/nodejs-esm/document-export-import/index.js
index 8322bf5..7f4f6f2 100644
--- a/example/nodejs-esm/document-export-import/index.js
+++ b/example/nodejs-esm/document-export-import/index.js
@@ -59,6 +59,7 @@ console.log(result);
 // -----------------------
 
 await fs.mkdir("./export/").catch(e => {});
+// call export
 await document.export(async function(key, data){
     await fs.writeFile("./export/" + key, data, "utf8");
 });
@@ -74,8 +75,9 @@ document = new Document(config);
 const files = await fs.readdir("./export/");
 await Promise.all(files.map(async file => {
     const data = await fs.readFile("./export/" + file, "utf8");
-    await document.import(file, data);
-}))
+    // call import
+    document.import(file, data);
+}));
 
 // perform query
 result = document.search({
diff --git a/example/nodejs-esm/document-worker-export-import/README.md b/example/nodejs-esm/document-worker-export-import/README.md
new file mode 100644
index 0000000..24ee65e
--- /dev/null
+++ b/example/nodejs-esm/document-worker-export-import/README.md
@@ -0,0 +1,7 @@
+```bash
+npm install
+```
+
+```bash
+node index.js
+```
\ No newline at end of file
diff --git a/example/nodejs-esm/document-worker-export-import/config.originalTitle.js b/example/nodejs-esm/document-worker-export-import/config.originalTitle.js
new file mode 100644
index 0000000..e04a664
--- /dev/null
+++ b/example/nodejs-esm/document-worker-export-import/config.originalTitle.js
@@ -0,0 +1,30 @@
+import { Encoder, Charset } from "flexsearch/esm";
+import EnglishPreset from "flexsearch/esm/lang/en";
+import { promises as fs } from "fs";
+
+(async function(){
+    await fs.mkdir("./export/").catch(e => {});
+}());
+
+export default {
+    tokenize: "forward",
+    encoder: new Encoder(
+        Charset.LatinBalance,
+        EnglishPreset,
+        {
+            normalize: function(str){
+                return str.toLowerCase();
+            },
+            filter: false,
+            minlength: 3
+        }
+    ),
+    export: async function(key, data){
+
+        await fs.writeFile("./export/" + key, data, "utf8");
+    },
+    import: async function(file){
+
+        return await fs.readFile("./export/" + file, "utf8");
+    }
+};
\ No newline at end of file
diff --git a/example/nodejs-esm/document-worker-export-import/config.primaryTitle.js b/example/nodejs-esm/document-worker-export-import/config.primaryTitle.js
new file mode 100644
index 0000000..e04a664
--- /dev/null
+++ b/example/nodejs-esm/document-worker-export-import/config.primaryTitle.js
@@ -0,0 +1,30 @@
+import { Encoder, Charset } from "flexsearch/esm";
+import EnglishPreset from "flexsearch/esm/lang/en";
+import { promises as fs } from "fs";
+
+(async function(){
+    await fs.mkdir("./export/").catch(e => {});
+}());
+
+export default {
+    tokenize: "forward",
+    encoder: new Encoder(
+        Charset.LatinBalance,
+        EnglishPreset,
+        {
+            normalize: function(str){
+                return str.toLowerCase();
+            },
+            filter: false,
+            minlength: 3
+        }
+    ),
+    export: async function(key, data){
+
+        await fs.writeFile("./export/" + key, data, "utf8");
+    },
+    import: async function(file){
+
+        return await fs.readFile("./export/" + file, "utf8");
+    }
+};
\ No newline at end of file
diff --git a/example/nodejs-esm/document-worker-export-import/data.json b/example/nodejs-esm/document-worker-export-import/data.json
new file mode 100644
index 0000000..1fd5660
--- /dev/null
+++ b/example/nodejs-esm/document-worker-export-import/data.json
@@ -0,0 +1,141 @@
+[
+  {
+    "tconst": "tt0000001",
+    "titleType": "short",
+    "primaryTitle": "Carmencita",
+    "originalTitle": "Carmencita",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000002",
+    "titleType": "short",
+    "primaryTitle": "Le clown et ses chiens",
+    "originalTitle": "Le clown et ses chiens",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "5",
+    "genres": [
+      "Animation",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000003",
+    "titleType": "short",
+    "primaryTitle": "Pauvre Pierrot",
+    "originalTitle": "Pauvre Pierrot",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "4",
+    "genres": [
+      "Animation",
+      "Comedy",
+      "Romance"
+    ]
+  },
+  {
+    "tconst": "tt0000004",
+    "titleType": "short",
+    "primaryTitle": "Un bon bock",
+    "originalTitle": "Un bon bock",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "12",
+    "genres": [
+      "Animation",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000005",
+    "titleType": "short",
+    "primaryTitle": "Blacksmith Scene",
+    "originalTitle": "Blacksmith Scene",
+    "isAdult": 0,
+    "startYear": "1893",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Comedy",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000006",
+    "titleType": "short",
+    "primaryTitle": "Chinese Opium Den",
+    "originalTitle": "Chinese Opium Den",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000007",
+    "titleType": "short",
+    "primaryTitle": "Corbett and Courtney Before the Kinetograph",
+    "originalTitle": "Corbett and Courtney Before the Kinetograph",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Short",
+      "Sport"
+    ]
+  },
+  {
+    "tconst": "tt0000008",
+    "titleType": "short",
+    "primaryTitle": "Edison Kinetoscopic Record of a Sneeze",
+    "originalTitle": "Edison Kinetoscopic Record of a Sneeze",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000009",
+    "titleType": "movie",
+    "primaryTitle": "Miss Jerry",
+    "originalTitle": "Miss Jerry",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "45",
+    "genres": [
+      "Romance"
+    ]
+  },
+  {
+    "tconst": "tt0000010",
+    "titleType": "short",
+    "primaryTitle": "Leaving the Factory",
+    "originalTitle": "La sortie de l'usine Lumière à Lyon",
+    "isAdult": 0,
+    "startYear": "1895",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  }
+]
\ No newline at end of file
diff --git a/example/nodejs-esm/document-worker-export-import/index.js b/example/nodejs-esm/document-worker-export-import/index.js
new file mode 100644
index 0000000..d553e2e
--- /dev/null
+++ b/example/nodejs-esm/document-worker-export-import/index.js
@@ -0,0 +1,104 @@
+import { Document } from "flexsearch/esm";
+import { promises as fs } from "fs";
+const dirname = import.meta.dirname;
+
+// you will need to keep the index configuration
+// they will not export, also every change to the
+// configuration requires a full re-index
+const config = {
+    worker: true,
+    document: {
+        id: "tconst",
+        store: true,
+        index: [{
+            field: "primaryTitle",
+            config: dirname + "/config.primaryTitle.js"
+        },{
+            field: "originalTitle",
+            config: dirname + "/config.originalTitle.js"
+        }],
+        tag: [{
+            field: "startYear"
+        },{
+            field: "genres"
+        }]
+    }
+};
+
+(async function(){
+
+    // loading test data
+    const data = JSON.parse(await fs.readFile(dirname + "/data.json"));
+
+    // create the document and await (!) for the instance response
+    let document = await new Document(config);
+
+    // add test data
+    for(let i = 0; i < data.length; i++){
+        await document.add(data[i]);
+    }
+
+    // perform a query
+    let result = await document.search({
+        query: "karmen",
+        tag: {
+            "startYear": "1894",
+            "genres": [
+                "Documentary",
+                "Short"
+            ]
+        },
+        suggest: true,
+        enrich: true,
+        merge: true
+    });
+
+    console.log(result);
+
+    // -----------------------
+    // EXPORT
+    // -----------------------
+
+    // create folders for the export
+    // it should be empty before export
+    await fs.mkdir("./export/").catch(e => {});
+    // call export
+    await document.export(async function(key, data){
+        await fs.writeFile("./export/" + key, data, "utf8");
+    });
+
+    // -----------------------
+    // IMPORT
+    // -----------------------
+
+    // create the same type of index you have used by .export()
+    // along with the same configuration
+    document = await new Document(config);
+
+    // load them in parallel
+    const files = await fs.readdir("./export/");
+    await Promise.all(files.map(async file => {
+        const data = await fs.readFile("./export/" + file, "utf8");
+        // call import
+        await document.import(file, data);
+    }));
+
+    // perform a query
+    result = await document.search({
+        query: "karmen",
+        tag: {
+            "startYear": "1894",
+            "genres": [
+                "Documentary",
+                "Short"
+            ]
+        },
+        suggest: true,
+        enrich: true,
+        merge: true
+    });
+
+    console.log("-------------------------------------");
+    console.log(result);
+
+}());
diff --git a/example/nodejs-esm/document-worker-export-import/package.json b/example/nodejs-esm/document-worker-export-import/package.json
new file mode 100644
index 0000000..d8a38df
--- /dev/null
+++ b/example/nodejs-esm/document-worker-export-import/package.json
@@ -0,0 +1,7 @@
+{
+  "name": "nodejs-esm-document-worker-export-import",
+  "type": "module",
+  "dependencies": {
+    "flexsearch": "github:nextapps-de/flexsearch"
+  }
+}
diff --git a/example/nodejs-esm/document-worker/package.json b/example/nodejs-esm/document-worker/package.json
index 541bcf9..6f50823 100644
--- a/example/nodejs-esm/document-worker/package.json
+++ b/example/nodejs-esm/document-worker/package.json
@@ -2,6 +2,6 @@
   "name": "nodejs-esm-document-worker",
   "type": "module",
   "dependencies": {
-    "flexsearch": "^0.8.105"
+    "flexsearch": "github:nextapps-de/flexsearch"
   }
 }
diff --git a/package-lock.json b/package-lock.json
index d1de39e..11229ab 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "flexsearch",
-  "version": "0.8.111",
+  "version": "0.8.113",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "flexsearch",
-      "version": "0.8.111",
+      "version": "0.8.113",
       "funding": [
         {
           "type": "github",
diff --git a/package.json b/package.json
index ff8f267..7752e06 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "public": true,
   "preferGlobal": false,
   "name": "flexsearch",
-  "version": "0.8.111",
+  "version": "0.8.113",
   "description": "Next-Generation full-text search library for Browser and Node.js",
   "homepage": "https://github.com/nextapps-de/flexsearch/",
   "author": "Thomas Wilkerling",
diff --git a/src/document/add.js b/src/document/add.js
index 6a6474d..469ca2e 100644
--- a/src/document/add.js
+++ b/src/document/add.js
@@ -4,7 +4,7 @@ import {
     SUPPORT_KEYSTORE,
     SUPPORT_PERSISTENT,
     SUPPORT_STORE,
-    SUPPORT_TAGS
+    SUPPORT_TAGS, SUPPORT_WORKER
 } from "../config.js";
 // <-- COMPILER BLOCK
 import { create_object, is_array, is_object, is_string, parse_simple } from "../common.js";
@@ -171,6 +171,10 @@ Document.prototype.add = function(id, content, _append){
 
             this.store.set(id, payload || content);
         }
+
+        if(SUPPORT_WORKER && this.worker){
+            this.fastupdate || this.reg.add(id);
+        }
     }
 
     return this;
diff --git a/src/serialize.js b/src/serialize.js
index efff5d3..172f665 100644
--- a/src/serialize.js
+++ b/src/serialize.js
@@ -1,3 +1,6 @@
+// COMPILER BLOCK -->
+import { SUPPORT_WORKER } from "./config.js";
+// <-- COMPILER BLOCK
 import Index from "./index.js";
 import Document from "./document.js";
 import { is_string } from "./common.js";
@@ -83,7 +86,7 @@ function json_to_ctx(json, ctx){
 }
 
 /**
- * @param {Set<string|number>} reg
+ * @param {Set<string|number>|Map<Array<string|number>>} reg
  * @return {Array<Array<string|number>>}
  */
 function reg_to_json(reg){
@@ -244,6 +247,9 @@ export function importIndex(key, data){
     if(split[split.length - 1] === "json"){
         split.pop();
     }
+    if(split.length === 3){
+        split.shift();
+    }
     key = split.length > 1 ? split[1] : split[0];
 
     switch(key){
@@ -355,6 +361,18 @@ export function exportDocument(callback, _field, _index_doc = 0, _index_obj = 0)
 
 export function importDocument(key, data){
 
+    const split = key.split(".");
+    if(split[split.length - 1] === "json"){
+        split.pop();
+    }
+    const field = split.length > 2 ? split[0] : "";
+    const ref = split.length > 2 ? split[2] : split[1];
+
+    // trigger the import for worker field indexes
+    if(SUPPORT_WORKER && this.worker && field){
+        return this.index.get(field).import(key);
+    }
+
     if(!data){
         return;
     }
@@ -364,16 +382,9 @@ export function importDocument(key, data){
         );
     }
 
-    const split = key.split(".");
-    if(split[split.length - 1] === "json"){
-        split.pop();
-    }
-    const field = split.length > 2 ? split[0] : "";
-    key = split.length > 2 ? split[2] : split[1];
-
     if(!field){
 
-        switch(key){
+        switch(ref){
 
             case "reg":
 
@@ -387,6 +398,22 @@ export function importDocument(key, data){
                     idx.reg = this.reg;
                 }
 
+                // trigger the import for worker field indexes
+                if(SUPPORT_WORKER && this.worker){
+
+                    const promises = [];
+                    const self = this;
+
+                    for(const index of this.index.values()){
+                        // const ref = item[0];
+                        // const index = item[1];
+                        promises.push(index.import(key));
+                        //this.index.get(field).import(key);
+                    }
+
+                    return Promise.all(promises);
+                }
+
                 break;
 
             case "tag":
@@ -407,7 +434,7 @@ export function importDocument(key, data){
     }
     else{
 
-        return this.index.get(field).import(key, data);
+        return this.index.get(field).import(ref, data);
     }
 }
 
diff --git a/src/worker.js b/src/worker.js
index 14ae6bf..230f5d3 100644
--- a/src/worker.js
+++ b/src/worker.js
@@ -2,7 +2,7 @@
 import { SUPPORT_ASYNC } from "./config.js";
 // <-- COMPILER BLOCK
 import { IndexOptions } from "./type.js";
-import { create_object, is_function, is_object, is_string } from "./common.js";
+import { create_object } from "./common.js";
 import handler from "./worker/handler.js";
 import apply_async from "./async.js";
 
@@ -88,7 +88,6 @@ export default function WorkerIndex(options = /** @type IndexOptions */ ({})){
     }
 
     const worker = create(factory, is_node_js, options.worker);
-    //worker.worker = true;
     return worker.then
         ? worker.then(function(worker){
             return init.call(_self, worker);
@@ -111,28 +110,29 @@ if(SUPPORT_ASYNC){
 
 function register(key){
 
-    WorkerIndex.prototype[key] =
-    /*WorkerIndex.prototype[key + "Async"] =*/ async function(){
+    WorkerIndex.prototype[key] = function(){
 
         const self = this;
         const args = [].slice.call(arguments);
         const arg = args[args.length - 1];
         let callback;
 
-        if(is_function(arg)){
+        if(typeof arg === "function"){
             callback = arg;
-            args.splice(args.length - 1, 1);
+            args.pop();
         }
 
         const promise = new Promise(function(resolve){
-            //setTimeout(function(){
-                self.resolver[++pid] = resolve;
-                self.worker.postMessage({
-                    "task": key,
-                    "id": pid,
-                    "args": args
-                });
-            //});
+            if(key === "export" && typeof args[0] === "function"){
+                // remove function handler
+                args[0] = null;
+            }
+            self.resolver[++pid] = resolve;
+            self.worker.postMessage({
+                "task": key,
+                "id": pid,
+                "args": args
+            });
         });
 
         if(callback){
@@ -140,7 +140,6 @@ function register(key){
             return this;
         }
         else{
-
             return promise;
         }
     };
@@ -151,8 +150,7 @@ function create(factory, is_node_js, worker_path){
     let worker
 
     worker = is_node_js ?
-        // This eval will be removed when compiling, it isn't there in final build
-
+            // This eval will be removed when compiling
             typeof module !== "undefined"
                 ? (0,eval)('new (require("worker_threads")["Worker"])(__dirname + "/node/node.js")')
                 //: (0,eval)('new ((await import("worker_threads"))["Worker"])(import.meta.dirname + "/worker/node.mjs")')
@@ -170,7 +168,13 @@ function create(factory, is_node_js, worker_path){
                 )
             ))
         :
-            new window.Worker(is_string(worker_path) ? worker_path : import.meta.url.replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", "module/worker/worker.js") /*"worker/worker.js"*/, { type: "module" })
+            new window.Worker(
+                typeof worker_path === "string"
+                    ? worker_path
+                    : import.meta.url.replace("/worker.js", "/worker/worker.js")
+                                     .replace("flexsearch.bundle.module.min.js", "module/worker/worker.js") /*"worker/worker.js"*/
+                , { type: "module" }
+            )
     );
 
     return worker;
diff --git a/src/worker/handler.js b/src/worker/handler.js
index 77271dc..4ab2a26 100644
--- a/src/worker/handler.js
+++ b/src/worker/handler.js
@@ -59,7 +59,13 @@ export default async function(data) {
                         throw new Error("Either no extern configuration provided for the Worker-Index or no method was defined on the config property \"export\".");
                     }
                 }
-                args = [options.export];
+                // skip non-field indexes
+                if(!args[1]) args = null;
+                else{
+                    args[0] = options.export;
+                    args[2] = 0;
+                    args[3] = 1; // skip reg
+                }
             }
             if(task === "import"){
                 if(DEBUG){
@@ -67,11 +73,14 @@ export default async function(data) {
                         throw new Error("Either no extern configuration provided for the Worker-Index or no method was defined on the config property \"import\".");
                     }
                 }
-                await options.import.call(index, index);
+                if(args[0]){
+                    const data = await options.import.call(index, args[0]);
+                    index.import(args[0], data);
+                }
             }
             else{
-                message = index[task].apply(index, args);
-                if(message.then){
+                message = args && index[task].apply(index, args);
+                if(message && message.then){
                     message = await message;
                 }
             }
diff --git a/src/worker/node.js b/src/worker/node.js
index 1402938..a29bff4 100644
--- a/src/worker/node.js
+++ b/src/worker/node.js
@@ -1,3 +1,7 @@
+/*
+ * Node.js Worker (CommonJS)
+ * This file is a standalone file and isn't being a part of the build/bundle
+ */
 const { parentPort } = require("worker_threads");
 //const { join } = require("path");
 // Test Path
@@ -41,17 +45,26 @@ parentPort.on("message", async function(data){
                 if(!options.export || typeof options.export !== "function"){
                     throw new Error("Either no extern configuration provided for the Worker-Index or no method was defined on the config property \"export\".");
                 }
-                args = [options.export];
+                // skip non-field indexes
+                if(!args[1]) args = null;
+                else{
+                    args[0] = options.export;
+                    args[2] = 0;
+                    args[3] = 1; // skip reg
+                }
             }
             if(task === "import"){
                 if(!options.import || typeof options.import !== "function"){
                     throw new Error("Either no extern configuration provided for the Worker-Index or no method was defined on the config property \"import\".");
                 }
-                await options.import.call(index, index);
+                if(args[0]){
+                    const data = await options.import.call(index, args[0]);
+                    index.import(args[0], data);
+                }
             }
             else{
-                message = index[task].apply(index, args);
-                if(message.then){
+                message = args && index[task].apply(index, args);
+                if(message && message.then){
                     message = await message;
                 }
             }
diff --git a/src/worker/node.mjs b/src/worker/node.mjs
index 14a1c52..ccdb210 100644
--- a/src/worker/node.mjs
+++ b/src/worker/node.mjs
@@ -1,3 +1,7 @@
+/*
+ * Node.js Worker (Standalone, ESM)
+ * This file is a standalone file and isn't being a part of the build/bundle
+ */
 import { parentPort } from "worker_threads";
 import { join } from "path";
 // Test Path
@@ -43,17 +47,26 @@ parentPort.on("message", async function(data){
                 if(!options.export || typeof options.export !== "function"){
                     throw new Error("Either no extern configuration provided for the Worker-Index or no method was defined on the config property \"export\".");
                 }
-                args = [options.export];
+                // skip non-field indexes
+                if(!args[1]) args = null;
+                else{
+                    args[0] = options.export;
+                    args[2] = 0;
+                    args[3] = 1; // skip reg
+                }
             }
             if(task === "import"){
                 if(!options.import || typeof options.import !== "function"){
                     throw new Error("Either no extern configuration provided for the Worker-Index or no method was defined on the config property \"import\".");
                 }
-                await options.import.call(index, index);
+                if(args[0]){
+                    const data = await options.import.call(index, args[0]);
+                    index.import(args[0], data);
+                }
             }
             else{
-                message = index[task].apply(index, args);
-                if(message.then){
+                message = args && index[task].apply(index, args);
+                if(message && message.then){
                     message = await message;
                 }
             }