diff --git a/dist/flexsearch.bundle.debug.js b/dist/flexsearch.bundle.debug.js
index 8c897d9..6f9516f 100644
--- a/dist/flexsearch.bundle.debug.js
+++ b/dist/flexsearch.bundle.debug.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.108 (Bundle/Debug)
+ * FlexSearch.js v0.8.109 (Bundle/Debug)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -282,8 +282,20 @@ async function ka(a) {
       break;
     default:
       let d;
-      "export" === b && (e = [N.export]);
-      "import" === b ? await N.import.call(M, M) : d = M[b].apply(M, e);
+      if ("export" === b) {
+        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];
+      }
+      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);
+      } else {
+        d = M[b].apply(M, e);
+      }
       postMessage("search" === b ? {id:c, msg:d} : {id:c});
   }
 }
@@ -1475,7 +1487,8 @@ function W(a) {
   this.J = [];
   this.key = (c = b.key || b.id) && Ta(c, this.J) || "id";
   (e = a.keystore || 0) && (this.keystore = e);
-  this.reg = (this.fastupdate = !!a.fastupdate) ? e ? new T(e) : new Map() : e ? new U(e) : new Set();
+  this.fastupdate = !!a.fastupdate;
+  this.reg = !this.fastupdate || a.worker || a.db ? e ? new U(e) : new Set() : e ? new T(e) : new Map();
   this.C = (c = b.store || null) && c && !0 !== c && [];
   this.store = c && (e ? new T(e) : new Map());
   this.cache = (c = a.cache || null) && new Y(c);
@@ -1501,6 +1514,7 @@ function W(a) {
     }
   }
   if (this.worker) {
+    this.fastupdate = !1;
     a = [];
     for (const d of this.index.values()) {
       d.then && a.push(d);
@@ -1517,11 +1531,14 @@ function W(a) {
       });
     }
   } else {
-    a.db && this.mount(a.db);
+    a.db && (this.fastupdate = !1, this.mount(a.db));
   }
 }
 t = V.prototype;
 t.mount = function(a) {
+  if (this.worker) {
+    throw Error("You can't use Worker-Indexes on a persistent model. That would be useless, since each of the persistent model acts like Worker-Index by default (Master/Slave).");
+  }
   let b = this.field;
   if (this.tag) {
     for (let d = 0, f; d < this.R.length; d++) {
@@ -2020,7 +2037,7 @@ function mb(a, b) {
   const e = !0 === c ? {depth:1} : c || {}, d = E(a.encoder) ? db[a.encoder] : a.encode || a.encoder || Wa;
   this.encoder = d.encode ? d : "object" === typeof d ? new J(d) : {encode:d};
   this.resolution = a.resolution || 9;
-  this.tokenize = c = a.tokenize || "strict";
+  this.tokenize = (c = a.tokenize) && "default" !== c || "strict";
   this.depth = "strict" === c && e.depth || 0;
   this.bidirectional = !1 !== e.bidirectional;
   this.fastupdate = !!a.fastupdate;
diff --git a/dist/flexsearch.bundle.min.js b/dist/flexsearch.bundle.min.js
index a200c4c..4c384cf 100644
--- a/dist/flexsearch.bundle.min.js
+++ b/dist/flexsearch.bundle.min.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.108 (Bundle)
+ * FlexSearch.js v0.8.109 (Bundle)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -55,9 +55,9 @@ else if(!q)return r?d:new X(d)}if(y){w=Ha(w,x,r);G=w.length;if(!G&&!q)return r?w
 d[z];u&&w.length&&!w[0].doc&&(this.db?v.push(w=this.index.get(this.field[0]).db.enrich(w)):w=W.call(this,w));if(g)return r?w:new X(w);d[z]={field:f[z],result:w}}if(u&&this.db&&v.length){const z=this;return Promise.all(v).then(function(w){for(let D=0;D<w.length;D++)d[D].result=w[D];return k?Ra(d,b):n?Sa(d,a,z.index,z.field,z.D,n):d})}return k?Ra(d,b):n?Sa(d,a,this.index,this.field,this.D,n):d};
 function Sa(a,b,c,e,d,f){let g,k,h;for(let m=0,n,p,q,r,u;m<a.length;m++){n=a[m].result;p=a[m].field;r=c.get(p);q=r.encoder;h=r.tokenize;u=d[e.indexOf(p)];q!==g&&(g=q,k=g.encode(b));for(let v=0;v<n.length;v++){let x="";var l=ba(n[v].doc,u);let y=g.encode(l);l=l.split(g.split);for(let F=0,z,w;F<y.length;F++){z=y[F];w=l[F];let D;for(let G=0,C;G<k.length;G++)if(C=k[G],"strict"===h){if(z===C){x+=(x?" ":"")+f.replace("$1",w);D=!0;break}}else{const H=z.indexOf(C);if(-1<H){x+=(x?" ":"")+w.substring(0,H)+
 f.replace("$1",w.substring(H,C.length))+w.substring(H+C.length);D=!0;break}}D||(x+=(x?" ":"")+l[F])}n[v].highlight=x}}return a}function Ra(a,b){const c=[],e=B();for(let d=0,f,g;d<a.length;d++){f=a[d];g=f.result;for(let k=0,h,l,m;k<g.length;k++)if(l=g[k],h=l.id,m=e[h])m.push(f.field);else{if(c.length===b)return c;l.field=e[h]=[f.field];c.push(l)}}return c}
-function Qa(a,b,c,e,d){a=this.tag.get(a);if(!a)return[];if((b=(a=a&&a.get(b))&&a.length-e)&&0<b){if(b>c||e)a=a.slice(e,e+c);d&&(a=W.call(this,a));return a}}function W(a){if(!this||!this.store)return a;const b=Array(a.length);for(let c=0,e;c<a.length;c++)e=a[c],b[c]={id:e,doc:this.store.get(e)};return b};function V(a){if(!this||this.constructor!==V)return new V(a);const b=a.document||a.doc||a;let c,e;this.D=[];this.field=[];this.J=[];this.key=(c=b.key||b.id)&&Ta(c,this.J)||"id";(e=a.keystore||0)&&(this.keystore=e);this.reg=(this.fastupdate=!!a.fastupdate)?e?new T(e):new Map:e?new U(e):new Set;this.C=(c=b.store||null)&&c&&!0!==c&&[];this.store=c&&(e?new T(e):new Map);this.cache=(c=a.cache||null)&&new Y(c);a.cache=!1;this.worker=a.worker;this.index=Ua.call(this,a,b);this.tag=null;if(c=b.tag)if("string"===
-typeof c&&(c=[c]),c.length){this.tag=new Map;this.F=[];this.R=[];for(let d=0,f,g;d<c.length;d++){f=c[d];g=f.field||f;if(!g)throw Error("The tag field from the document descriptor is undefined.");f.custom?this.F[d]=f.custom:(this.F[d]=Ta(g,this.J),f.filter&&("string"===typeof this.F[d]&&(this.F[d]=new String(this.F[d])),this.F[d].I=f.filter));this.R[d]=g;this.tag.set(g,new Map)}}if(this.worker){a=[];for(const d of this.index.values())d.then&&a.push(d);if(a.length){const d=this;return Promise.all(a).then(function(f){let g=
-0;for(const k of d.index.entries()){const h=k[0];k[1].then&&d.index.set(h,f[g++])}return d})}}else a.db&&this.mount(a.db)}t=V.prototype;
+function Qa(a,b,c,e,d){a=this.tag.get(a);if(!a)return[];if((b=(a=a&&a.get(b))&&a.length-e)&&0<b){if(b>c||e)a=a.slice(e,e+c);d&&(a=W.call(this,a));return a}}function W(a){if(!this||!this.store)return a;const b=Array(a.length);for(let c=0,e;c<a.length;c++)e=a[c],b[c]={id:e,doc:this.store.get(e)};return b};function V(a){if(!this||this.constructor!==V)return new V(a);const b=a.document||a.doc||a;let c,e;this.D=[];this.field=[];this.J=[];this.key=(c=b.key||b.id)&&Ta(c,this.J)||"id";(e=a.keystore||0)&&(this.keystore=e);this.fastupdate=!!a.fastupdate;this.reg=!this.fastupdate||a.worker||a.db?e?new U(e):new Set:e?new T(e):new Map;this.C=(c=b.store||null)&&c&&!0!==c&&[];this.store=c&&(e?new T(e):new Map);this.cache=(c=a.cache||null)&&new Y(c);a.cache=!1;this.worker=a.worker;this.index=Ua.call(this,a,b);this.tag=
+null;if(c=b.tag)if("string"===typeof c&&(c=[c]),c.length){this.tag=new Map;this.F=[];this.R=[];for(let d=0,f,g;d<c.length;d++){f=c[d];g=f.field||f;if(!g)throw Error("The tag field from the document descriptor is undefined.");f.custom?this.F[d]=f.custom:(this.F[d]=Ta(g,this.J),f.filter&&("string"===typeof this.F[d]&&(this.F[d]=new String(this.F[d])),this.F[d].I=f.filter));this.R[d]=g;this.tag.set(g,new Map)}}if(this.worker){this.fastupdate=!1;a=[];for(const d of this.index.values())d.then&&a.push(d);
+if(a.length){const d=this;return Promise.all(a).then(function(f){let g=0;for(const k of d.index.entries()){const h=k[0];k[1].then&&d.index.set(h,f[g++])}return d})}}else a.db&&(this.fastupdate=!1,this.mount(a.db))}t=V.prototype;
 t.mount=function(a){let b=this.field;if(this.tag)for(let d=0,f;d<this.R.length;d++){f=this.R[d];var c=void 0;this.index.set(f,c=new O({},this.reg));b===this.field&&(b=b.slice(0));b.push(f);c.tag=this.tag.get(f)}c=[];const e={db:a.db,type:a.type,fastupdate:a.fastupdate};for(let d=0,f,g;d<b.length;d++){e.field=g=b[d];f=this.index.get(g);const k=new a.constructor(a.id,e);k.id=a.id;c[d]=k.mount(f);f.document=!0;d?f.bypass=!0:f.store=this.store}this.db=!0;return Promise.all(c)};
 t.commit=async function(a,b){const c=[];for(const e of this.index.values())c.push(e.db.commit(e,a,b));await Promise.all(c);this.reg.clear()};t.destroy=function(){const a=[];for(const b of this.index.values())a.push(b.destroy());return Promise.all(a)};
 function Ua(a,b){const c=new Map;let e=b.index||b.field||b;E(e)&&(e=[e]);for(let d=0,f,g;d<e.length;d++){f=e[d];E(f)||(g=f,f=f.field);g=I(g)?Object.assign({},a,g):a;if(this.worker){const k=new Q(g);c.set(f,k)}this.worker||c.set(f,new O(g,this.reg));g.custom?this.D[d]=g.custom:(this.D[d]=Ta(f,this.J),g.filter&&("string"===typeof this.D[d]&&(this.D[d]=new String(this.D[d])),this.D[d].I=g.filter));this.field[d]=f}if(this.C){a=b.store;E(a)&&(a=[a]);for(let d=0,f,g;d<a.length;d++)f=a[d],g=f.field||f,f.custom?
@@ -75,9 +75,9 @@ function fb(a,b,c,e,d){return c&&1<a?b+(e||0)<=a?c+(d||0):(a-1)/(b+(e||0))*(c+(d
 this.resolution);if(this.db){if(this.db.search&&(a=this.db.search(this,q,b,k,g,h,p,l),!1!==a))return a;const x=this;return async function(){for(let y,F;u<d;u++){if((F=q[u])&&!r[F]){r[F]=1;y=await jb(x,F,v,0,0,!1,!1);if(y=kb(y,e,g,n)){e=y;break}v&&(g&&y&&e.length||(v=F))}g&&v&&u===d-1&&!e.length&&(v="",u=-1,r=B())}return lb(e,n,b,k,g,m,h)}()}for(let x,y;u<d;u++){if((y=q[u])&&!r[y]){r[y]=1;x=jb(this,y,v,0,0,!1,!1);if(x=kb(x,e,g,n)){e=x;break}v&&(g&&x&&e.length||(v=y))}g&&v&&u===d-1&&!e.length&&(v="",
 u=-1,r=B())}return lb(e,n,b,k,g,m,h)};function lb(a,b,c,e,d,f,g){let k=a.length,h=a;if(1<k)h=Fa(a,b,c,e,d,f,g);else if(1===k)return g?Ia.call(null,a[0],c,e):new X(a[0]);return g?h:new X(h)}function ib(a,b,c,e,d,f,g){a=jb(this,a,b,c,e,d,f,g);return this.db?a.then(function(k){return d?k||[]:new X(k)}):a&&a.length?d?Ia.call(this,a,c,e):new X(a):d?[]:new X}
 function kb(a,b,c,e){let d=[];if(a&&a.length){if(a.length<=e){b.push(a);return}for(let f=0,g;f<e;f++)if(g=a[f])d[f]=g;if(d.length){b.push(d);return}}if(!c)return d}function jb(a,b,c,e,d,f,g,k){let h;c&&(h=a.bidirectional&&b>c)&&(h=c,c=b,b=h);if(a.db)return a.db.get(b,c,e,d,f,g,k);a=c?(a=a.ctx.get(c))&&a.get(b):a.map.get(b);return a};O.prototype.remove=function(a,b){const c=this.reg.size&&(this.fastupdate?this.reg.get(a):this.reg.has(a));if(c){if(this.fastupdate)for(let e=0,d;e<c.length;e++){if(d=c[e])if(2>d.length)d.pop();else{const f=d.indexOf(a);f===c.length-1?d.pop():d.splice(f,1)}}else mb(this.map,a),this.depth&&mb(this.ctx,a);b||this.reg.delete(a)}this.db&&(this.commit_task.push({del:a}),this.T&&hb(this));this.cache&&this.cache.remove(a);return this};
-function mb(a,b){let c=0;if(a.constructor===Array)for(let e=0,d,f;e<a.length;e++){if((d=a[e])&&d.length)if(f=d.indexOf(b),0<=f){1<d.length?(d.splice(f,1),c++):delete a[e];break}else c++}else for(let e of a.entries()){const d=e[0],f=mb(e[1],b);f?c+=f:a.delete(d)}return c};function O(a,b){if(!this||this.constructor!==O)return new O(a);if(a){var c=E(a)?a:a.preset;c&&(a=Object.assign({},eb[c],a))}else a={};c=a.context;const e=!0===c?{depth:1}:c||{},d=E(a.encoder)?db[a.encoder]:a.encode||a.encoder||Wa;this.encoder=d.encode?d:"object"===typeof d?new J(d):{encode:d};this.resolution=a.resolution||9;this.tokenize=c=a.tokenize||"strict";this.depth="strict"===c&&e.depth||0;this.bidirectional=!1!==e.bidirectional;this.fastupdate=!!a.fastupdate;this.score=a.score||null;(c=a.keystore||
-0)&&(this.keystore=c);this.map=c?new T(c):new Map;this.ctx=c?new T(c):new Map;this.reg=b||(this.fastupdate?c?new T(c):new Map:c?new U(c):new Set);this.U=e.resolution||3;this.rtl=d.rtl||a.rtl||!1;this.cache=(c=a.cache||null)&&new Y(c);this.resolve=!1!==a.resolve;if(c=a.db)this.db=this.mount(c);this.T=!1!==a.commit;this.commit_task=[];this.commit_timer=null;this.priority=a.priority||4}t=O.prototype;t.mount=function(a){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return a.mount(this)};
-t.commit=function(a,b){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return this.db.commit(this,a,b)};t.destroy=function(){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return this.db.destroy()};function hb(a){a.commit_timer||(a.commit_timer=setTimeout(function(){a.commit_timer=null;a.db.commit(a,void 0,void 0)},0))}
+function mb(a,b){let c=0;if(a.constructor===Array)for(let e=0,d,f;e<a.length;e++){if((d=a[e])&&d.length)if(f=d.indexOf(b),0<=f){1<d.length?(d.splice(f,1),c++):delete a[e];break}else c++}else for(let e of a.entries()){const d=e[0],f=mb(e[1],b);f?c+=f:a.delete(d)}return c};function O(a,b){if(!this||this.constructor!==O)return new O(a);if(a){var c=E(a)?a:a.preset;c&&(a=Object.assign({},eb[c],a))}else a={};c=a.context;const e=!0===c?{depth:1}:c||{},d=E(a.encoder)?db[a.encoder]:a.encode||a.encoder||Wa;this.encoder=d.encode?d:"object"===typeof d?new J(d):{encode:d};this.resolution=a.resolution||9;this.tokenize=(c=a.tokenize)&&"default"!==c||"strict";this.depth="strict"===c&&e.depth||0;this.bidirectional=!1!==e.bidirectional;this.fastupdate=!!a.fastupdate;this.score=a.score||
+null;(c=a.keystore||0)&&(this.keystore=c);this.map=c?new T(c):new Map;this.ctx=c?new T(c):new Map;this.reg=b||(this.fastupdate?c?new T(c):new Map:c?new U(c):new Set);this.U=e.resolution||3;this.rtl=d.rtl||a.rtl||!1;this.cache=(c=a.cache||null)&&new Y(c);this.resolve=!1!==a.resolve;if(c=a.db)this.db=this.mount(c);this.T=!1!==a.commit;this.commit_task=[];this.commit_timer=null;this.priority=a.priority||4}t=O.prototype;
+t.mount=function(a){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return a.mount(this)};t.commit=function(a,b){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return this.db.commit(this,a,b)};t.destroy=function(){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return this.db.destroy()};function hb(a){a.commit_timer||(a.commit_timer=setTimeout(function(){a.commit_timer=null;a.db.commit(a,void 0,void 0)},0))}
 t.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)};
diff --git a/dist/flexsearch.bundle.module.debug.js b/dist/flexsearch.bundle.module.debug.js
index 243ed61..356bead 100644
--- a/dist/flexsearch.bundle.module.debug.js
+++ b/dist/flexsearch.bundle.module.debug.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.108 (Bundle/Module/Debug)
+ * FlexSearch.js v0.8.109 (Bundle/Module/Debug)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -281,8 +281,20 @@ async function ka(a) {
       break;
     default:
       let d;
-      "export" === b && (e = [N.export]);
-      "import" === b ? await N.import.call(M, M) : d = M[b].apply(M, e);
+      if ("export" === b) {
+        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];
+      }
+      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);
+      } else {
+        d = M[b].apply(M, e);
+      }
       postMessage("search" === b ? {id:c, msg:d} : {id:c});
   }
 }
@@ -1474,7 +1486,8 @@ function W(a) {
   this.J = [];
   this.key = (c = b.key || b.id) && Ta(c, this.J) || "id";
   (e = a.keystore || 0) && (this.keystore = e);
-  this.reg = (this.fastupdate = !!a.fastupdate) ? e ? new T(e) : new Map() : e ? new U(e) : new Set();
+  this.fastupdate = !!a.fastupdate;
+  this.reg = !this.fastupdate || a.worker || a.db ? e ? new U(e) : new Set() : e ? new T(e) : new Map();
   this.C = (c = b.store || null) && c && !0 !== c && [];
   this.store = c && (e ? new T(e) : new Map());
   this.cache = (c = a.cache || null) && new Y(c);
@@ -1500,6 +1513,7 @@ function W(a) {
     }
   }
   if (this.worker) {
+    this.fastupdate = !1;
     a = [];
     for (const d of this.index.values()) {
       d.then && a.push(d);
@@ -1516,11 +1530,14 @@ function W(a) {
       });
     }
   } else {
-    a.db && this.mount(a.db);
+    a.db && (this.fastupdate = !1, this.mount(a.db));
   }
 }
 t = V.prototype;
 t.mount = function(a) {
+  if (this.worker) {
+    throw Error("You can't use Worker-Indexes on a persistent model. That would be useless, since each of the persistent model acts like Worker-Index by default (Master/Slave).");
+  }
   let b = this.field;
   if (this.tag) {
     for (let d = 0, f; d < this.R.length; d++) {
@@ -2019,7 +2036,7 @@ function mb(a, b) {
   const e = !0 === c ? {depth:1} : c || {}, d = E(a.encoder) ? db[a.encoder] : a.encode || a.encoder || Wa;
   this.encoder = d.encode ? d : "object" === typeof d ? new J(d) : {encode:d};
   this.resolution = a.resolution || 9;
-  this.tokenize = c = a.tokenize || "strict";
+  this.tokenize = (c = a.tokenize) && "default" !== c || "strict";
   this.depth = "strict" === c && e.depth || 0;
   this.bidirectional = !1 !== e.bidirectional;
   this.fastupdate = !!a.fastupdate;
diff --git a/dist/flexsearch.bundle.module.min.js b/dist/flexsearch.bundle.module.min.js
index d43e6c5..15da3ab 100644
--- a/dist/flexsearch.bundle.module.min.js
+++ b/dist/flexsearch.bundle.module.min.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.108 (Bundle/Module)
+ * FlexSearch.js v0.8.109 (Bundle/Module)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -55,9 +55,9 @@ else if(!q)return r?d:new X(d)}if(y){w=Ha(w,x,r);G=w.length;if(!G&&!q)return r?w
 d[z];u&&w.length&&!w[0].doc&&(this.db?v.push(w=this.index.get(this.field[0]).db.enrich(w)):w=W.call(this,w));if(g)return r?w:new X(w);d[z]={field:f[z],result:w}}if(u&&this.db&&v.length){const z=this;return Promise.all(v).then(function(w){for(let D=0;D<w.length;D++)d[D].result=w[D];return k?Ra(d,b):n?Sa(d,a,z.index,z.field,z.D,n):d})}return k?Ra(d,b):n?Sa(d,a,this.index,this.field,this.D,n):d};
 function Sa(a,b,c,e,d,f){let g,k,h;for(let m=0,n,p,q,r,u;m<a.length;m++){n=a[m].result;p=a[m].field;r=c.get(p);q=r.encoder;h=r.tokenize;u=d[e.indexOf(p)];q!==g&&(g=q,k=g.encode(b));for(let v=0;v<n.length;v++){let x="";var l=ba(n[v].doc,u);let y=g.encode(l);l=l.split(g.split);for(let F=0,z,w;F<y.length;F++){z=y[F];w=l[F];let D;for(let G=0,C;G<k.length;G++)if(C=k[G],"strict"===h){if(z===C){x+=(x?" ":"")+f.replace("$1",w);D=!0;break}}else{const H=z.indexOf(C);if(-1<H){x+=(x?" ":"")+w.substring(0,H)+
 f.replace("$1",w.substring(H,C.length))+w.substring(H+C.length);D=!0;break}}D||(x+=(x?" ":"")+l[F])}n[v].highlight=x}}return a}function Ra(a,b){const c=[],e=B();for(let d=0,f,g;d<a.length;d++){f=a[d];g=f.result;for(let k=0,h,l,m;k<g.length;k++)if(l=g[k],h=l.id,m=e[h])m.push(f.field);else{if(c.length===b)return c;l.field=e[h]=[f.field];c.push(l)}}return c}
-function Qa(a,b,c,e,d){a=this.tag.get(a);if(!a)return[];if((b=(a=a&&a.get(b))&&a.length-e)&&0<b){if(b>c||e)a=a.slice(e,e+c);d&&(a=W.call(this,a));return a}}function W(a){if(!this||!this.store)return a;const b=Array(a.length);for(let c=0,e;c<a.length;c++)e=a[c],b[c]={id:e,doc:this.store.get(e)};return b};function V(a){if(!this||this.constructor!==V)return new V(a);const b=a.document||a.doc||a;let c,e;this.D=[];this.field=[];this.J=[];this.key=(c=b.key||b.id)&&Ta(c,this.J)||"id";(e=a.keystore||0)&&(this.keystore=e);this.reg=(this.fastupdate=!!a.fastupdate)?e?new T(e):new Map:e?new U(e):new Set;this.C=(c=b.store||null)&&c&&!0!==c&&[];this.store=c&&(e?new T(e):new Map);this.cache=(c=a.cache||null)&&new Y(c);a.cache=!1;this.worker=a.worker;this.index=Ua.call(this,a,b);this.tag=null;if(c=b.tag)if("string"===
-typeof c&&(c=[c]),c.length){this.tag=new Map;this.F=[];this.R=[];for(let d=0,f,g;d<c.length;d++){f=c[d];g=f.field||f;if(!g)throw Error("The tag field from the document descriptor is undefined.");f.custom?this.F[d]=f.custom:(this.F[d]=Ta(g,this.J),f.filter&&("string"===typeof this.F[d]&&(this.F[d]=new String(this.F[d])),this.F[d].I=f.filter));this.R[d]=g;this.tag.set(g,new Map)}}if(this.worker){a=[];for(const d of this.index.values())d.then&&a.push(d);if(a.length){const d=this;return Promise.all(a).then(function(f){let g=
-0;for(const k of d.index.entries()){const h=k[0];k[1].then&&d.index.set(h,f[g++])}return d})}}else a.db&&this.mount(a.db)}t=V.prototype;
+function Qa(a,b,c,e,d){a=this.tag.get(a);if(!a)return[];if((b=(a=a&&a.get(b))&&a.length-e)&&0<b){if(b>c||e)a=a.slice(e,e+c);d&&(a=W.call(this,a));return a}}function W(a){if(!this||!this.store)return a;const b=Array(a.length);for(let c=0,e;c<a.length;c++)e=a[c],b[c]={id:e,doc:this.store.get(e)};return b};function V(a){if(!this||this.constructor!==V)return new V(a);const b=a.document||a.doc||a;let c,e;this.D=[];this.field=[];this.J=[];this.key=(c=b.key||b.id)&&Ta(c,this.J)||"id";(e=a.keystore||0)&&(this.keystore=e);this.fastupdate=!!a.fastupdate;this.reg=!this.fastupdate||a.worker||a.db?e?new U(e):new Set:e?new T(e):new Map;this.C=(c=b.store||null)&&c&&!0!==c&&[];this.store=c&&(e?new T(e):new Map);this.cache=(c=a.cache||null)&&new Y(c);a.cache=!1;this.worker=a.worker;this.index=Ua.call(this,a,b);this.tag=
+null;if(c=b.tag)if("string"===typeof c&&(c=[c]),c.length){this.tag=new Map;this.F=[];this.R=[];for(let d=0,f,g;d<c.length;d++){f=c[d];g=f.field||f;if(!g)throw Error("The tag field from the document descriptor is undefined.");f.custom?this.F[d]=f.custom:(this.F[d]=Ta(g,this.J),f.filter&&("string"===typeof this.F[d]&&(this.F[d]=new String(this.F[d])),this.F[d].I=f.filter));this.R[d]=g;this.tag.set(g,new Map)}}if(this.worker){this.fastupdate=!1;a=[];for(const d of this.index.values())d.then&&a.push(d);
+if(a.length){const d=this;return Promise.all(a).then(function(f){let g=0;for(const k of d.index.entries()){const h=k[0];k[1].then&&d.index.set(h,f[g++])}return d})}}else a.db&&(this.fastupdate=!1,this.mount(a.db))}t=V.prototype;
 t.mount=function(a){let b=this.field;if(this.tag)for(let d=0,f;d<this.R.length;d++){f=this.R[d];var c=void 0;this.index.set(f,c=new O({},this.reg));b===this.field&&(b=b.slice(0));b.push(f);c.tag=this.tag.get(f)}c=[];const e={db:a.db,type:a.type,fastupdate:a.fastupdate};for(let d=0,f,g;d<b.length;d++){e.field=g=b[d];f=this.index.get(g);const k=new a.constructor(a.id,e);k.id=a.id;c[d]=k.mount(f);f.document=!0;d?f.bypass=!0:f.store=this.store}this.db=!0;return Promise.all(c)};
 t.commit=async function(a,b){const c=[];for(const e of this.index.values())c.push(e.db.commit(e,a,b));await Promise.all(c);this.reg.clear()};t.destroy=function(){const a=[];for(const b of this.index.values())a.push(b.destroy());return Promise.all(a)};
 function Ua(a,b){const c=new Map;let e=b.index||b.field||b;E(e)&&(e=[e]);for(let d=0,f,g;d<e.length;d++){f=e[d];E(f)||(g=f,f=f.field);g=I(g)?Object.assign({},a,g):a;if(this.worker){const k=new Q(g);c.set(f,k)}this.worker||c.set(f,new O(g,this.reg));g.custom?this.D[d]=g.custom:(this.D[d]=Ta(f,this.J),g.filter&&("string"===typeof this.D[d]&&(this.D[d]=new String(this.D[d])),this.D[d].I=g.filter));this.field[d]=f}if(this.C){a=b.store;E(a)&&(a=[a]);for(let d=0,f,g;d<a.length;d++)f=a[d],g=f.field||f,f.custom?
@@ -75,9 +75,9 @@ function fb(a,b,c,e,d){return c&&1<a?b+(e||0)<=a?c+(d||0):(a-1)/(b+(e||0))*(c+(d
 this.resolution);if(this.db){if(this.db.search&&(a=this.db.search(this,q,b,k,g,h,p,l),!1!==a))return a;const x=this;return async function(){for(let y,F;u<d;u++){if((F=q[u])&&!r[F]){r[F]=1;y=await jb(x,F,v,0,0,!1,!1);if(y=kb(y,e,g,n)){e=y;break}v&&(g&&y&&e.length||(v=F))}g&&v&&u===d-1&&!e.length&&(v="",u=-1,r=B())}return lb(e,n,b,k,g,m,h)}()}for(let x,y;u<d;u++){if((y=q[u])&&!r[y]){r[y]=1;x=jb(this,y,v,0,0,!1,!1);if(x=kb(x,e,g,n)){e=x;break}v&&(g&&x&&e.length||(v=y))}g&&v&&u===d-1&&!e.length&&(v="",
 u=-1,r=B())}return lb(e,n,b,k,g,m,h)};function lb(a,b,c,e,d,f,g){let k=a.length,h=a;if(1<k)h=Fa(a,b,c,e,d,f,g);else if(1===k)return g?Ia.call(null,a[0],c,e):new X(a[0]);return g?h:new X(h)}function ib(a,b,c,e,d,f,g){a=jb(this,a,b,c,e,d,f,g);return this.db?a.then(function(k){return d?k||[]:new X(k)}):a&&a.length?d?Ia.call(this,a,c,e):new X(a):d?[]:new X}
 function kb(a,b,c,e){let d=[];if(a&&a.length){if(a.length<=e){b.push(a);return}for(let f=0,g;f<e;f++)if(g=a[f])d[f]=g;if(d.length){b.push(d);return}}if(!c)return d}function jb(a,b,c,e,d,f,g,k){let h;c&&(h=a.bidirectional&&b>c)&&(h=c,c=b,b=h);if(a.db)return a.db.get(b,c,e,d,f,g,k);a=c?(a=a.ctx.get(c))&&a.get(b):a.map.get(b);return a};O.prototype.remove=function(a,b){const c=this.reg.size&&(this.fastupdate?this.reg.get(a):this.reg.has(a));if(c){if(this.fastupdate)for(let e=0,d;e<c.length;e++){if(d=c[e])if(2>d.length)d.pop();else{const f=d.indexOf(a);f===c.length-1?d.pop():d.splice(f,1)}}else mb(this.map,a),this.depth&&mb(this.ctx,a);b||this.reg.delete(a)}this.db&&(this.commit_task.push({del:a}),this.T&&hb(this));this.cache&&this.cache.remove(a);return this};
-function mb(a,b){let c=0;if(a.constructor===Array)for(let e=0,d,f;e<a.length;e++){if((d=a[e])&&d.length)if(f=d.indexOf(b),0<=f){1<d.length?(d.splice(f,1),c++):delete a[e];break}else c++}else for(let e of a.entries()){const d=e[0],f=mb(e[1],b);f?c+=f:a.delete(d)}return c};function O(a,b){if(!this||this.constructor!==O)return new O(a);if(a){var c=E(a)?a:a.preset;c&&(a=Object.assign({},eb[c],a))}else a={};c=a.context;const e=!0===c?{depth:1}:c||{},d=E(a.encoder)?db[a.encoder]:a.encode||a.encoder||Wa;this.encoder=d.encode?d:"object"===typeof d?new J(d):{encode:d};this.resolution=a.resolution||9;this.tokenize=c=a.tokenize||"strict";this.depth="strict"===c&&e.depth||0;this.bidirectional=!1!==e.bidirectional;this.fastupdate=!!a.fastupdate;this.score=a.score||null;(c=a.keystore||
-0)&&(this.keystore=c);this.map=c?new T(c):new Map;this.ctx=c?new T(c):new Map;this.reg=b||(this.fastupdate?c?new T(c):new Map:c?new U(c):new Set);this.U=e.resolution||3;this.rtl=d.rtl||a.rtl||!1;this.cache=(c=a.cache||null)&&new Y(c);this.resolve=!1!==a.resolve;if(c=a.db)this.db=this.mount(c);this.T=!1!==a.commit;this.commit_task=[];this.commit_timer=null;this.priority=a.priority||4}t=O.prototype;t.mount=function(a){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return a.mount(this)};
-t.commit=function(a,b){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return this.db.commit(this,a,b)};t.destroy=function(){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return this.db.destroy()};function hb(a){a.commit_timer||(a.commit_timer=setTimeout(function(){a.commit_timer=null;a.db.commit(a,void 0,void 0)},0))}
+function mb(a,b){let c=0;if(a.constructor===Array)for(let e=0,d,f;e<a.length;e++){if((d=a[e])&&d.length)if(f=d.indexOf(b),0<=f){1<d.length?(d.splice(f,1),c++):delete a[e];break}else c++}else for(let e of a.entries()){const d=e[0],f=mb(e[1],b);f?c+=f:a.delete(d)}return c};function O(a,b){if(!this||this.constructor!==O)return new O(a);if(a){var c=E(a)?a:a.preset;c&&(a=Object.assign({},eb[c],a))}else a={};c=a.context;const e=!0===c?{depth:1}:c||{},d=E(a.encoder)?db[a.encoder]:a.encode||a.encoder||Wa;this.encoder=d.encode?d:"object"===typeof d?new J(d):{encode:d};this.resolution=a.resolution||9;this.tokenize=(c=a.tokenize)&&"default"!==c||"strict";this.depth="strict"===c&&e.depth||0;this.bidirectional=!1!==e.bidirectional;this.fastupdate=!!a.fastupdate;this.score=a.score||
+null;(c=a.keystore||0)&&(this.keystore=c);this.map=c?new T(c):new Map;this.ctx=c?new T(c):new Map;this.reg=b||(this.fastupdate?c?new T(c):new Map:c?new U(c):new Set);this.U=e.resolution||3;this.rtl=d.rtl||a.rtl||!1;this.cache=(c=a.cache||null)&&new Y(c);this.resolve=!1!==a.resolve;if(c=a.db)this.db=this.mount(c);this.T=!1!==a.commit;this.commit_task=[];this.commit_timer=null;this.priority=a.priority||4}t=O.prototype;
+t.mount=function(a){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return a.mount(this)};t.commit=function(a,b){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return this.db.commit(this,a,b)};t.destroy=function(){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return this.db.destroy()};function hb(a){a.commit_timer||(a.commit_timer=setTimeout(function(){a.commit_timer=null;a.db.commit(a,void 0,void 0)},0))}
 t.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)};
diff --git a/dist/flexsearch.compact.debug.js b/dist/flexsearch.compact.debug.js
index 3baf3af..008b4a1 100644
--- a/dist/flexsearch.compact.debug.js
+++ b/dist/flexsearch.compact.debug.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.108 (Bundle/Debug)
+ * FlexSearch.js v0.8.109 (Bundle/Debug)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -7,14 +7,14 @@
  */
 (function(self){'use strict';
 var w;
-function A(a, c, b) {
+function B(a, c, b) {
   const e = typeof b, d = typeof a;
   if ("undefined" !== e) {
     if ("undefined" !== d) {
       if (b) {
         if ("function" === d && e === d) {
-          return function(h) {
-            return a(b(h));
+          return function(k) {
+            return a(b(k));
           };
         }
         c = a.constructor;
@@ -89,7 +89,7 @@ function K(a) {
 }
 w = K.prototype;
 w.assign = function(a) {
-  this.normalize = A(a.normalize, !0, this.normalize);
+  this.normalize = B(a.normalize, !0, this.normalize);
   let c = a.include, b = c || a.exclude || a.split, e;
   if (b || "" === b) {
     if ("object" === typeof b && b.constructor !== RegExp) {
@@ -112,28 +112,28 @@ w.assign = function(a) {
     } else {
       this.split = b, e = !1 === b || 2 > "a1a".split(b).length;
     }
-    this.numeric = A(a.numeric, e);
+    this.numeric = B(a.numeric, e);
   } else {
     try {
-      this.split = A(this.split, ca);
+      this.split = B(this.split, ca);
     } catch (d) {
       console.warn("This platform does not support unicode regex. It falls back to using simple whitespace splitter instead: /s+/."), this.split = /\s+/;
     }
-    this.numeric = A(a.numeric, A(this.numeric, !0));
+    this.numeric = B(a.numeric, B(this.numeric, !0));
   }
-  this.prepare = A(a.prepare, null, this.prepare);
-  this.finalize = A(a.finalize, null, this.finalize);
+  this.prepare = B(a.prepare, null, this.prepare);
+  this.finalize = B(a.finalize, null, this.finalize);
   ha || (this.mapper = new Map(ba));
-  this.rtl = A(a.rtl, !1, this.rtl);
-  this.dedupe = A(a.dedupe, !1, this.dedupe);
-  this.filter = A((b = a.filter) && new Set(b), null, this.filter);
-  this.matcher = A((b = a.matcher) && new Map(b), null, this.matcher);
-  this.mapper = A((b = a.mapper) && new Map(b), null, this.mapper);
-  this.stemmer = A((b = a.stemmer) && new Map(b), null, this.stemmer);
-  this.replacer = A(a.replacer, null, this.replacer);
-  this.minlength = A(a.minlength, 1, this.minlength);
-  this.maxlength = A(a.maxlength, 0, this.maxlength);
-  if (this.cache = b = A(a.cache, !0, this.cache)) {
+  this.rtl = B(a.rtl, !1, this.rtl);
+  this.dedupe = B(a.dedupe, !1, this.dedupe);
+  this.filter = B((b = a.filter) && new Set(b), null, this.filter);
+  this.matcher = B((b = a.matcher) && new Map(b), null, this.matcher);
+  this.mapper = B((b = a.mapper) && new Map(b), null, this.mapper);
+  this.stemmer = B((b = a.stemmer) && new Map(b), null, this.stemmer);
+  this.replacer = B(a.replacer, null, this.replacer);
+  this.minlength = B(a.minlength, 1, this.minlength);
+  this.maxlength = B(a.maxlength, 0, this.maxlength);
+  if (this.cache = b = B(a.cache, !0, this.cache)) {
     this.H = null, this.R = "number" === typeof b ? b : 2e5, this.F = new Map(), this.G = new Map(), this.L = this.K = 128;
   }
   this.h = "";
@@ -216,8 +216,8 @@ w.encode = function(a) {
   this.numeric && 3 < a.length && (a = a.replace(ea, "$1 $2").replace(fa, "$1 $2").replace(da, "$1 "));
   const c = !(this.dedupe || this.mapper || this.filter || this.matcher || this.stemmer || this.replacer);
   let b = [], e = this.split || "" === this.split ? a.split(this.split) : a;
-  for (let f = 0, g, h; f < e.length; f++) {
-    if ((g = h = e[f]) && !(g.length < this.minlength)) {
+  for (let f = 0, g, k; f < e.length; f++) {
+    if ((g = k = e[f]) && !(g.length < this.minlength)) {
       if (c) {
         b.push(g);
       } else {
@@ -233,21 +233,21 @@ w.encode = function(a) {
               this.H = setTimeout(L, 50, this);
             }
           }
-          this.stemmer && 2 < g.length && (this.N || (this.N = new RegExp("(?!^)(" + this.D + ")$")), g = g.replace(this.N, k => this.stemmer.get(k)), g.length < this.minlength || this.filter && this.filter.has(g)) && (g = "");
+          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 k = 0, l = "", m, n; k < g.length; k++) {
-              m = g.charAt(k), m === l && this.dedupe || ((n = this.mapper && this.mapper.get(m)) || "" === n ? n === l && this.dedupe || !(l = n) || (d += n) : d += l = m);
+            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, k => this.matcher.get(k)));
+          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 && h.length <= this.L && (this.G.set(h, g), this.G.size > this.R && (this.G.clear(), this.L = this.L / 1.1 | 0));
+          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);
         }
       }
@@ -275,8 +275,20 @@ async function ia(a) {
       break;
     default:
       let d;
-      "export" === c && (e = [N.export]);
-      "import" === c ? await N.import.call(M, M) : d = M[c].apply(M, e);
+      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 = [N.export];
+      }
+      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".');
+        }
+        await N.import.call(M, M);
+      } else {
+        d = M[c].apply(M, e);
+      }
       postMessage("search" === c ? {id:b, msg:d} : {id:b});
   }
 }
@@ -320,19 +332,19 @@ function P(a) {
 ;let T = 0;
 function ma(a = {}) {
   function c(g) {
-    function h(k) {
-      k = k.data || k;
-      const l = k.id, m = l && d.h[l];
-      m && (m(k.msg), delete d.h[l]);
+    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", h) : this.worker.onmessage = h;
+      e ? this.worker.on("message", k) : this.worker.onmessage = k;
       if (a.config) {
-        return new Promise(function(k) {
+        return new Promise(function(h) {
           d.h[++T] = function() {
-            k(d);
+            h(d);
           };
           d.worker.postMessage({id:T, task:"init", factory:b, options:a});
         });
@@ -425,18 +437,18 @@ function ta(a, c) {
   return c;
 }
 function ua(a, c, b, e, d, f, g = 0) {
-  const h = e && e.constructor === Array;
-  var k = h ? e.shift() : e;
-  if (!k) {
+  const k = e && e.constructor === Array;
+  var h = k ? e.shift() : e;
+  if (!h) {
     return this.export(a, c, d, f + 1);
   }
-  if ((k = a((c ? c + "." : "") + (g + 1) + "." + b, JSON.stringify(k))) && k.then) {
+  if ((h = a((c ? c + "." : "") + (g + 1) + "." + b, JSON.stringify(h))) && h.then) {
     const l = this;
-    return k.then(function() {
-      return ua.call(l, a, c, b, h ? e : null, d, f, g + 1);
+    return h.then(function() {
+      return ua.call(l, a, c, b, k ? e : null, d, f, g + 1);
     });
   }
-  return ua.call(this, a, c, b, h ? e : null, d, f, g + 1);
+  return ua.call(this, a, c, b, k ? e : null, d, f, g + 1);
 }
 ;V.prototype.add = function(a, c, b) {
   H(a) && (c = a, a = J(c, this.key));
@@ -444,15 +456,15 @@ function ua(a, c, b, e, d, f, g = 0) {
     if (!b && this.reg.has(a)) {
       return this.update(a, c);
     }
-    for (let h = 0, k; h < this.field.length; h++) {
-      k = this.C[h];
-      var e = this.index.get(this.field[h]);
-      if ("function" === typeof k) {
-        var d = k(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 = k.I, !d || d(c)) {
-          k.constructor === String ? k = ["" + k] : D(k) && (k = [k]), va(c, k, this.J, 0, e, a, k[0], b);
+        if (d = h.I, !d || d(c)) {
+          h.constructor === String ? h = ["" + h] : D(h) && (h = [h]), va(c, h, this.J, 0, e, a, h[0], b);
         }
       }
     }
@@ -460,14 +472,14 @@ function ua(a, c, b, e, d, f, g = 0) {
       for (e = 0; e < this.B.length; e++) {
         var f = this.B[e], g = this.T[e];
         d = this.tag.get(g);
-        let h = C();
+        let k = C();
         if ("function" === typeof f) {
           if (f = f(c), !f) {
             continue;
           }
         } else {
-          const k = f.I;
-          if (k && !k(c)) {
+          const h = f.I;
+          if (h && !h(c)) {
             continue;
           }
           f.constructor === String && (f = "" + f);
@@ -475,8 +487,8 @@ function ua(a, c, b, e, d, f, g = 0) {
         }
         if (d && f) {
           D(f) && (f = [f]);
-          for (let k = 0, l, m; k < f.length; k++) {
-            l = f[k], h[l] || (h[l] = 1, (g = d.get(l)) ? m = g : d.set(l, m = []), b && m.includes(a) || (m.push(a), this.fastupdate && ((g = this.reg.get(a)) ? g.push(m) : this.reg.set(a, [m]))));
+          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]))));
           }
         } else {
           d || console.warn("Tag '" + g + "' was not found");
@@ -484,11 +496,11 @@ function ua(a, c, b, e, d, f, g = 0) {
       }
     }
     if (this.store && (!b || !this.store.has(a))) {
-      let h;
+      let k;
       if (this.A) {
-        h = C();
-        for (let k = 0, l; k < this.A.length; k++) {
-          l = this.A[k];
+        k = C();
+        for (let h = 0, l; h < this.A.length; h++) {
+          l = this.A[h];
           if ((b = l.I) && !b(c)) {
             continue;
           }
@@ -500,13 +512,13 @@ function ua(a, c, b, e, d, f, g = 0) {
             }
             l = [l.U];
           } else if (D(l) || l.constructor === String) {
-            h[l] = c[l];
+            k[l] = c[l];
             continue;
           }
-          wa(c, h, l, 0, l[0], m);
+          wa(c, k, l, 0, l[0], m);
         }
       }
-      this.store.set(a, h || c);
+      this.store.set(a, k || c);
     }
   }
   return this;
@@ -525,7 +537,7 @@ function wa(a, c, b, e, d, f) {
     }
   }
 }
-function va(a, c, b, e, d, f, g, h) {
+function va(a, c, b, e, d, f, g, k) {
   if (a = a[g]) {
     if (e === c.length - 1) {
       if (a.constructor === Array) {
@@ -537,27 +549,27 @@ function va(a, c, b, e, d, f, g, h) {
         }
         a = a.join(" ");
       }
-      d.add(f, a, h, !0);
+      d.add(f, a, k, !0);
     } else {
       if (a.constructor === Array) {
         for (g = 0; g < a.length; g++) {
-          va(a, c, b, e, d, f, g, h);
+          va(a, c, b, e, d, f, g, k);
         }
       } else {
-        g = c[++e], va(a, c, b, e, d, f, g, h);
+        g = c[++e], va(a, c, b, e, d, f, g, k);
       }
     }
   }
 }
 ;function xa(a, c, b, e, d) {
   const f = a.length;
-  let g = [], h, k;
-  h = C();
+  let g = [], k, h;
+  k = C();
   for (let l = 0, m, n, t, p; l < c; l++) {
     for (let q = 0; q < f; q++) {
       if (t = a[q], l < t.length && (m = t[l])) {
         for (let y = 0; y < m.length; y++) {
-          n = m[y], (k = h[n]) ? h[n]++ : (k = 0, h[n] = 1), p = g[k] || (g[k] = []), p.push(n);
+          n = m[y], (h = k[n]) ? k[n]++ : (h = 0, k[n] = 1), p = g[h] || (g[h] = []), p.push(n);
         }
       }
     }
@@ -583,10 +595,10 @@ function ya(a, c, b) {
   const e = [], d = C();
   let f;
   var g = a.length;
-  let h;
-  for (let k = g - 1; 0 <= k; k--) {
-    if (h = (g = a[k]) && g.length) {
-      for (let l = 0; l < h; l++) {
+  let k;
+  for (let h = g - 1; 0 <= h; h--) {
+    if (k = (g = a[h]) && g.length) {
+      for (let l = 0; l < k; l++) {
         if (f = g[l], !d[f]) {
           if (d[f] = 1, b) {
             b--;
@@ -601,26 +613,18 @@ function ya(a, c, b) {
   }
   return e;
 }
-function za(a, c, b) {
-  const e = C(), d = [];
-  for (let f = 0, g; f < c.length; f++) {
-    g = c[f];
-    for (let h = 0; h < g.length; h++) {
-      e[g[h]] = 1;
+function za(a, c) {
+  const b = C(), e = [];
+  for (let d = 0, f; d < c.length; d++) {
+    f = c[d];
+    for (let g = 0; g < f.length; g++) {
+      b[f[g]] = 1;
     }
   }
-  if (b) {
-    for (let f = 0, g; f < a.length; f++) {
-      g = a[f], e[g] && (d.push(g), e[g] = 0);
-    }
-  } else {
-    for (let f = 0, g, h; f < a.result.length; f++) {
-      for (g = a.result[f], c = 0; c < g.length; c++) {
-        h = g[c], e[h] && ((d[f] || (d[f] = [])).push(h), e[h] = 0);
-      }
-    }
+  for (let d = 0, f; d < a.length; d++) {
+    f = a[d], b[f] && (e.push(f), b[f] = 0);
   }
-  return d;
+  return e;
 }
 ;function Aa(a, c, b, e) {
   if (!a.length) {
@@ -630,21 +634,21 @@ function za(a, c, b) {
     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, h; f < a.length; f++) {
-    if ((g = a[f]) && (h = g.length)) {
+  for (let f = 0, g, k; f < a.length; f++) {
+    if ((g = a[f]) && (k = g.length)) {
       if (b) {
-        if (b >= h) {
-          b -= h;
+        if (b >= k) {
+          b -= k;
           continue;
         }
-        b < h && (g = c ? g.slice(b, b + c) : g.slice(b), h = g.length, b = 0);
+        b < k && (g = c ? g.slice(b, b + c) : g.slice(b), k = g.length, b = 0);
       }
-      h > c && (g = g.slice(0, c), h = c);
-      if (!d.length && h >= c) {
+      k > c && (g = g.slice(0, c), k = c);
+      if (!d.length && k >= c) {
         return e ? W.call(this, g) : g;
       }
       d.push(g);
-      c -= h;
+      c -= k;
       if (!c) {
         break;
       }
@@ -664,7 +668,7 @@ function za(a, c, b) {
     return a[c].apply(a, e);
   }
   e = [];
-  let d = [], f = 0, g = 0, h, k, l;
+  let d = [], f = 0, g = 0, k, h, l;
   for (let m = 0, n; m < b.length; m++) {
     if (n = b[m]) {
       let t;
@@ -673,8 +677,8 @@ function za(a, c, b) {
       } else if (n.constructor === Array) {
         t = n;
       } else {
-        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, t = n.index.search(n).result, n.resolve = k, n.enrich = h;
+        if (f = n.limit || 0, g = n.offset || 0, l = n.suggest, h = n.resolve, k = n.enrich && h, n.index) {
+          n.resolve = !1, n.enrich = !1, t = n.index.search(n).result, n.resolve = h, n.enrich = k;
         } else if (n.and) {
           t = a.and(n.and);
         } else if (n.or) {
@@ -697,7 +701,7 @@ function za(a, c, b) {
       }
     }
   }
-  return {O:e, P:d, limit:f, offset:g, enrich:h, resolve:k, suggest:l};
+  return {O:e, P:d, limit:f, offset:g, enrich:k, resolve:h, suggest:l};
 }
 ;X.prototype.or = function() {
   const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f} = Ba(this, "or", arguments);
@@ -706,10 +710,10 @@ function za(a, c, b) {
 function Ca(a, c, b, e, d, f) {
   if (c.length) {
     const g = this;
-    return Promise.all(c).then(function(h) {
+    return Promise.all(c).then(function(k) {
       a = [];
-      for (let k = 0, l; k < h.length; k++) {
-        (l = h[k]).length && (a[k] = l);
+      for (let h = 0, l; h < k.length; h++) {
+        (l = k[h]).length && (a[h] = l);
       }
       return Ca.call(g, a, [], b, e, d, f);
     });
@@ -724,20 +728,20 @@ function Ca(a, c, b, e, d, f) {
     f && (a = !!f.suggest, d = f.resolve, c = f.limit, b = f.offset, e = f.enrich && d);
   }
   if (a) {
-    const {O:f, P:g, limit:h, offset:k, enrich:l, resolve:m, suggest:n} = Ba(this, "and", arguments);
-    return Da.call(this, f, g, h, k, 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 Da(a, c, b, e, d, f, g) {
   if (c.length) {
-    const h = this;
-    return Promise.all(c).then(function(k) {
+    const k = this;
+    return Promise.all(c).then(function(h) {
       a = [];
-      for (let l = 0, m; l < k.length; l++) {
-        (m = k[l]).length && (a[l] = m);
+      for (let l = 0, m; l < h.length; l++) {
+        (m = h[l]).length && (a[l] = m);
       }
-      return Da.call(h, a, [], b, e, d, f, g);
+      return Da.call(k, a, [], b, e, d, f, g);
     });
   }
   if (a.length) {
@@ -760,13 +764,13 @@ function Da(a, c, b, e, d, f, g) {
 };
 function Ea(a, c, b, e, d, f, g) {
   if (c.length) {
-    const h = this;
-    return Promise.all(c).then(function(k) {
+    const k = this;
+    return Promise.all(c).then(function(h) {
       a = [];
-      for (let l = 0, m; l < k.length; l++) {
-        (m = k[l]).length && (a[l] = m);
+      for (let l = 0, m; l < h.length; l++) {
+        (m = h[l]).length && (a[l] = m);
       }
-      return Ea.call(h, a, [], b, e, d, f, g);
+      return Ea.call(k, a, [], b, e, d, f, g);
     });
   }
   if (a.length) {
@@ -782,10 +786,10 @@ function Ea(a, c, b, e, d, f, g) {
 }
 function Fa(a, c, b, e, d) {
   const f = [], g = C();
-  let h = 0;
-  for (let k = 0, l; k < a.length; k++) {
-    if (l = a[k]) {
-      h < l.length && (h = l.length);
+  let k = 0;
+  for (let h = 0, l; h < a.length; h++) {
+    if (l = a[h]) {
+      k < l.length && (k = l.length);
       for (let m = 0, n; m < l.length; m++) {
         if (n = l[m]) {
           for (let t = 0, p; t < n.length; t++) {
@@ -795,10 +799,10 @@ function Fa(a, c, b, e, d) {
       }
     }
   }
-  for (let k = 0, l, m = 0; k < h; k++) {
+  for (let h = 0, l, m = 0; h < k; h++) {
     for (let n = 0, t; n < a.length; n++) {
       if (t = a[n]) {
-        if (l = t[k]) {
+        if (l = t[h]) {
           for (let p = 0, q; p < l.length; p++) {
             if (q = l[p], 1 === g[q]) {
               if (b) {
@@ -809,7 +813,7 @@ function Fa(a, c, b, e, d) {
                     return f;
                   }
                 } else {
-                  const y = k + (n ? d : 0);
+                  const y = h + (n ? d : 0);
                   f[y] || (f[y] = []);
                   f[y].push(q);
                   if (++m === c) {
@@ -831,13 +835,13 @@ function Fa(a, c, b, e, d) {
 };
 function Ga(a, c, b, e, d, f, g) {
   if (c.length) {
-    const h = this;
-    return Promise.all(c).then(function(k) {
+    const k = this;
+    return Promise.all(c).then(function(h) {
       a = [];
-      for (let l = 0, m; l < k.length; l++) {
-        (m = k[l]).length && (a[l] = m);
+      for (let l = 0, m; l < h.length; l++) {
+        (m = h[l]).length && (a[l] = m);
       }
-      return Ga.call(h, a, [], b, e, d, f, g);
+      return Ga.call(k, a, [], b, e, d, f, g);
     });
   }
   if (a.length && this.result.length) {
@@ -850,10 +854,10 @@ function Ga(a, c, b, e, d, f, g) {
 function Ha(a, c, b, e) {
   const d = [];
   a = new Set(a.flat().flat());
-  for (let f = 0, g, h = 0; f < this.result.length; f++) {
+  for (let f = 0, g, k = 0; f < this.result.length; f++) {
     if (g = this.result[f]) {
-      for (let k = 0, l; k < g.length; k++) {
-        if (l = g[k], !a.has(l)) {
+      for (let h = 0, l; h < g.length; h++) {
+        if (l = g[h], !a.has(l)) {
           if (b) {
             b--;
           } else {
@@ -862,7 +866,7 @@ function Ha(a, c, b, e) {
                 return d;
               }
             } else {
-              if (d[f] || (d[f] = []), d[f].push(l), ++h === c) {
+              if (d[f] || (d[f] = []), d[f].push(l), ++k === c) {
                 return d;
               }
             }
@@ -929,15 +933,15 @@ V.prototype.search = function(a, c, b, e) {
   b || (!c && H(a) ? (b = a, a = "") : H(c) && (b = c, c = 0));
   let d = [];
   var f = [];
-  let g, h, k, l, m, n, t = 0, p, q;
+  let g, k, h, l, m, n, t = 0, p, q;
   if (b) {
     b.constructor === Array && (b = {index:b});
     a = b.query || a;
     var y = b.pluck;
-    h = b.merge;
+    k = b.merge;
     l = y || b.field || (l = b.index) && (l.index ? null : l);
     m = this.tag && b.tag;
-    k = b.suggest;
+    h = b.suggest;
     p = !0;
     this.store && b.enrich && !p && console.warn("Enrich results can only be done on a final resolver task or when calling .resolve({ enrich: true })");
     g = this.store && b.enrich && p;
@@ -964,13 +968,13 @@ V.prototype.search = function(a, c, b, e) {
           }
         } else {
           v = Object.keys(r);
-          for (let E = 0, F, B; E < v.length; E++) {
-            if (F = v[E], B = r[F], B.constructor === Array) {
-              for (z = 0; z < B.length; z++) {
-                u.push(F, B[z]);
+          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]);
               }
             } else {
-              u.push(F, B);
+              u.push(F, A);
             }
           }
         }
@@ -1000,12 +1004,12 @@ V.prototype.search = function(a, c, b, e) {
   u = !e && (this.worker || this.db) && [];
   for (let x = 0, r, E, F; x < l.length; x++) {
     E = l[x];
-    let B;
-    D(E) || (B = E, E = B.field, a = B.query || a, c = B.limit || c, n = B.offset || n, k = B.suggest || k, g = this.store && (B.enrich || g));
+    let A;
+    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 = B || b, z = this.index.get(E), 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;
@@ -1017,25 +1021,25 @@ V.prototype.search = function(a, c, b, e) {
     if (m && F) {
       v = [];
       z = 0;
-      for (let G = 0, I, $a; G < m.length; G += 2) {
+      for (let G = 0, I, Za; G < m.length; G += 2) {
         I = this.tag.get(m[G]);
         if (!I) {
-          if (console.warn("Tag '" + m[G] + ":" + m[G + 1] + "' will be skipped because there is no field '" + m[G] + "'."), k) {
+          if (console.warn("Tag '" + m[G] + ":" + m[G + 1] + "' will be skipped because there is no field '" + m[G] + "'."), h) {
             continue;
           } else {
             return p ? d : new X(d);
           }
         }
-        if ($a = (I = I && I.get(m[G + 1])) && I.length) {
+        if (Za = (I = I && I.get(m[G + 1])) && I.length) {
           z++, v.push(I);
-        } else if (!k) {
+        } else if (!h) {
           return p ? d : new X(d);
         }
       }
       if (z) {
-        r = za(r, v, p);
+        r = za(r, v);
         F = r.length;
-        if (!F && !k) {
+        if (!F && !h) {
           return p ? r : new X(r);
         }
         z--;
@@ -1068,18 +1072,18 @@ V.prototype.search = function(a, c, b, e) {
     }
     d[x] = {field:f[x], result:r};
   }
-  return h ? Ja(d, c) : q ? Ka(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 Ka(a, c, b, e, d, f) {
-  let g, h, k;
+  let g, k, h;
   for (let m = 0, n, t, p, q, y; m < a.length; m++) {
     n = a[m].result;
     t = a[m].field;
     q = b.get(t);
     p = q.encoder;
-    k = q.tokenize;
+    h = q.tokenize;
     y = d[e.indexOf(t)];
-    p !== g && (g = p, h = g.encode(c));
+    p !== g && (g = p, k = g.encode(c));
     for (let u = 0; u < n.length; u++) {
       let v = "";
       var l = J(n[u].doc, y);
@@ -1089,8 +1093,8 @@ function Ka(a, c, b, e, d, f) {
         r = z[x];
         E = l[x];
         let F;
-        for (let B = 0, G; B < h.length; B++) {
-          if (G = h[B], "strict" === k) {
+        for (let A = 0, G; A < k.length; A++) {
+          if (G = k[A], "strict" === h) {
             if (r === G) {
               v += (v ? " " : "") + f.replace("$1", E);
               F = !0;
@@ -1117,14 +1121,14 @@ function Ja(a, c) {
   for (let d = 0, f, g; d < a.length; d++) {
     f = a[d];
     g = f.result;
-    for (let h = 0, k, l, m; h < g.length; h++) {
-      if (l = g[h], k = l.id, m = e[k]) {
+    for (let k = 0, h, l, m; k < g.length; k++) {
+      if (l = g[k], h = l.id, m = e[h]) {
         m.push(f.field);
       } else {
         if (b.length === c) {
           return b;
         }
-        l.field = e[k] = [f.field];
+        l.field = e[h] = [f.field];
         b.push(l);
       }
     }
@@ -1272,9 +1276,9 @@ w.export = function(a, c, b = 0, e = 0) {
   if (b < this.field.length) {
     const g = this.field[b];
     if ((c = this.index.get(g).export(a, g, b, e = 1)) && c.then) {
-      const h = this;
+      const k = this;
       return c.then(function() {
-        return h.export(a, g, b + 1);
+        return k.export(a, g, b + 1);
       });
     }
     return this.export(a, g, b + 1);
@@ -1415,34 +1419,34 @@ O.prototype.add = function(a, c, b, e) {
             case "full":
               if (2 < d) {
                 for (f = 0; f < d; f++) {
-                  for (var h = d; h > f; h--) {
-                    g = q.substring(f, h);
-                    var k = this.score ? this.score(c, q, p, g, f) : Xa(t, e, p, d, f);
-                    Z(this, m, g, k, a, b);
+                  for (var k = d; k > f; k--) {
+                    g = q.substring(f, k);
+                    var h = this.score ? this.score(c, q, p, g, f) : Xa(t, e, p, d, f);
+                    Z(this, m, g, h, a, b);
                   }
                 }
                 break;
               }
             case "reverse":
               if (1 < d) {
-                for (h = d - 1; 0 < h; h--) {
-                  g = q[h] + g, k = this.score ? this.score(c, q, p, g, h) : Xa(t, e, p, d, h), Z(this, m, g, k, a, b);
+                for (k = d - 1; 0 < k; k--) {
+                  g = q[k] + g, h = this.score ? this.score(c, q, p, g, k) : Xa(t, e, p, d, k), Z(this, m, g, h, a, b);
                 }
                 g = "";
               }
             case "forward":
               if (1 < d) {
-                for (h = 0; h < d; h++) {
-                  g += q[h], Z(this, m, g, f, a, b);
+                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, h = Math.min(n + 1, e - p), d[f] = 1, k = 1; k < h; k++) {
-                  if ((q = c[this.rtl ? e - 1 - p - k : p + k]) && !d[q]) {
+                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, k) : Xa(g + (e / 2 > g ? 0 : 1), e, p, h - 1, k - 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);
                   }
                 }
@@ -1456,9 +1460,9 @@ O.prototype.add = function(a, c, b, e) {
   return this;
 };
 function Z(a, c, b, e, d, f, g) {
-  let h = g ? a.ctx : a.map, k;
-  if (!c[b] || g && !(k = c[b])[g]) {
-    g ? (c = k || (c[b] = C()), c[g] = 1, (k = h.get(g)) ? h = k : h.set(g, h = new Map())) : c[b] = 1, (k = h.get(b)) ? h = k : h.set(b, h = []), h = h[e] || (h[e] = []), f && h.includes(d) || (h.push(d), a.fastupdate && ((c = a.reg.get(d)) ? c.push(h) : a.reg.set(d, [h])));
+  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) {
@@ -1473,35 +1477,35 @@ function Xa(a, c, b, e, d) {
     d = b.offset || 0;
     var f = b.context;
     var g = b.suggest;
-    var h = !0;
-    var k = b.resolution;
+    var k = !0;
+    var h = b.resolution;
   } else {
-    h = !0;
+    k = !0;
   }
-  b = this.encoder.encode(a);
-  a = b.length;
-  c = c || (h ? 100 : 0);
-  if (1 === a) {
-    return Ya.call(this, b[0], "", c, d, h);
+  a = this.encoder.encode(a);
+  b = a.length;
+  c = c || (k ? 100 : 0);
+  if (1 === b) {
+    return g = c, (c = Ya(this, a[0], "")) && c.length ? Aa.call(this, c, g, d) : [];
   }
   f = this.depth && !1 !== f;
-  if (2 === a && f && !g) {
-    return Ya.call(this, b[0], b[1], c, d, h);
+  if (2 === b && f && !g) {
+    return g = c, (c = Ya(this, a[0], a[1])) && c.length ? Aa.call(this, c, g, d) : [];
   }
-  h = C();
+  k = C();
   let l = 0;
-  if (1 < a && f) {
-    var m = b[0];
+  if (1 < b && f) {
+    var m = a[0];
     l = 1;
   }
-  k || 0 === k || (k = m ? this.S : this.resolution);
-  for (let q, y; l < a; l++) {
-    if ((y = b[l]) && !h[y]) {
-      h[y] = 1;
-      q = Za(this, y, m);
+  h || 0 === h || (h = m ? this.S : this.resolution);
+  for (let q, y; l < b; l++) {
+    if ((y = a[l]) && !k[y]) {
+      k[y] = 1;
+      q = Ya(this, y, m);
       a: {
         f = q;
-        var n = e, t = g, p = k;
+        var n = e, t = g, p = h;
         let u = [];
         if (f && f.length) {
           if (f.length <= p) {
@@ -1528,27 +1532,23 @@ function Xa(a, c, b, e, d) {
       }
       m && (g && q && e.length || (m = y));
     }
-    g && m && l === a - 1 && !e.length && (m = "", l = -1, h = C());
+    g && m && l === b - 1 && !e.length && (m = "", l = -1, k = C());
   }
   a: {
-    m = e.length;
     a = e;
-    if (1 < m) {
-      a = xa(e, k, c, d, g);
-    } else if (1 === m) {
-      g = Aa.call(null, e[0], c, d);
+    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 = a;
+    g = m;
   }
   return g;
 };
-function Ya(a, c, b, e, d) {
-  a = Za(this, a, c);
-  d = !0;
-  return a && a.length ? d ? Aa.call(this, a, b, e) : new X(a) : d ? [] : new X();
-}
-function Za(a, c, b) {
+function Ya(a, c, b) {
   let e;
   b && (e = a.bidirectional && c > b) && (e = b, b = c, c = e);
   a = b ? (a = a.ctx.get(b)) && a.get(c) : a.map.get(c);
@@ -1569,14 +1569,14 @@ function Za(a, c, b) {
         }
       }
     } else {
-      ab(this.map, a), this.depth && ab(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 ab(a, c) {
+function $a(a, c) {
   let b = 0;
   if (a.constructor === Array) {
     for (let e = 0, d, f; e < a.length; e++) {
@@ -1591,7 +1591,7 @@ function ab(a, c) {
     }
   } else {
     for (let e of a.entries()) {
-      const d = e[0], f = ab(e[1], c);
+      const d = e[0], f = $a(e[1], c);
       f ? b += f : a.delete(d);
     }
   }
@@ -1611,7 +1611,7 @@ function ab(a, c) {
   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 || "strict";
+  this.tokenize = (b = a.tokenize) && "default" !== b || "strict";
   this.depth = "strict" === b && e.depth || 0;
   this.bidirectional = !1 !== e.bidirectional;
   this.fastupdate = !!a.fastupdate;
@@ -1643,7 +1643,7 @@ 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 bb(a) {
+function ab(a) {
   let c = 0;
   if (a.constructor === Array) {
     for (let b = 0, e; b < a.length; b++) {
@@ -1651,7 +1651,7 @@ function bb(a) {
     }
   } else {
     for (const b of a) {
-      const e = b[0], d = bb(b[1]);
+      const e = b[0], d = ab(b[1]);
       d ? c += d : a.delete(e);
     }
   }
@@ -1661,8 +1661,8 @@ w.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
-  bb(this.map);
-  this.depth && bb(this.ctx);
+  ab(this.map);
+  this.depth && ab(this.ctx);
   return this;
 };
 w.searchCache = Ma;
@@ -1716,18 +1716,18 @@ w.serialize = function(a = !0) {
   c = "index.reg=new Set([" + c + "]);";
   e = "";
   for (var d of this.map.entries()) {
-    var f = d[0], g = d[1], h = "";
+    var f = d[0], g = d[1], k = "";
     for (let m = 0, n; m < g.length; m++) {
       n = g[m] || [""];
-      var k = "";
+      var h = "";
       for (var l = 0; l < n.length; l++) {
-        k += (k ? "," : "") + ("string" === b ? '"' + n[l] + '"' : n[l]);
+        h += (h ? "," : "") + ("string" === b ? '"' + n[l] + '"' : n[l]);
       }
-      k = "[" + k + "]";
-      h += (h ? "," : "") + k;
+      h = "[" + h + "]";
+      k += (k ? "," : "") + h;
     }
-    h = '["' + f + '",[' + h + "]]";
-    e += (e ? "," : "") + h;
+    k = '["' + f + '",[' + k + "]]";
+    e += (e ? "," : "") + k;
   }
   e = "index.map=new Map([" + e + "]);";
   d = "";
@@ -1736,29 +1736,29 @@ w.serialize = function(a = !0) {
     g = m[1];
     for (const n of g.entries()) {
       g = n[0];
-      h = n[1];
-      k = "";
-      for (let t = 0, p; t < h.length; t++) {
-        p = h[t] || [""];
+      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 + "]";
-        k += (k ? "," : "") + l;
+        h += (h ? "," : "") + l;
       }
-      k = 'new Map([["' + g + '",[' + k + "]]])";
-      k = '["' + f + '",' + k + "]";
-      d += (d ? "," : "") + k;
+      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 cb = {Index:O, Charset:Va, Encoder:K, Document:V, Worker:null, Resolver:null, IndexedDB:null, Language:{}}, db = "undefined" !== typeof self ? self : "undefined" !== typeof global ? global : "undefined" !== typeof window ? window : {};
-let eb;
-(eb = db.define) && eb.amd ? eb([], function() {
-  return cb;
-}) : "object" === typeof db.exports ? db.exports = cb : db.FlexSearch = cb;
+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 d5e4856..322bd48 100644
--- a/dist/flexsearch.compact.min.js
+++ b/dist/flexsearch.compact.min.js
@@ -1,11 +1,11 @@
 /**!
- * FlexSearch.js v0.8.108 (Bundle)
+ * FlexSearch.js v0.8.109 (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 A(a,c,b){const e=typeof b,d=typeof a;if("undefined"!==e){if("undefined"!==d){if(b){if("function"===d&&e===d)return function(h){return a(b(h))};c=a.constructor;if(c===b.constructor){if(c===Array)return b.concat(a);if(c===Map){var 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(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 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",
@@ -13,58 +13,57 @@ function H(a){return"object"===typeof a}function I(a,c){if(D(c))a=a[c];else for(
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-function $a(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 ab(this.map,a),this.depth&&ab(this.ctx,a);c||this.reg.delete(a)}this.cache&&this.cache.remove(a);return this};
-function ab(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=ab(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||"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 bb(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=bb(b[1]);d?c+=d:a.delete(e)}return c}v.cleanup=function(){if(!this.fastupdate)return this;bb(this.map);this.depth&&bb(this.ctx);return this};v.searchCache=Ma;
+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<
+d){for(k=d-1;0<k;k--)g=q[k]+g,h=this.score?this.score(c,q,p,g,k):Xa(t,e,p,d,k),Z(this,m,g,h,a,b);g=""}case "forward":if(1<d){for(k=0;k<d;k++)g+=q[k],Z(this,m,g,f,a,b);break}default:if(Z(this,m,q,f,a,b),n&&1<e&&p<e-1)for(d=C(),g=this.S,f=q,k=Math.min(n+1,e-p),d[f]=1,h=1;h<k;h++)if((q=c[this.rtl?e-1-p-h:p+h])&&!d[q]){d[q]=1;const y=this.score?this.score(c,f,p,q,h):Xa(g+(e/2>g?0:1),e,p,k-1,h-1),w=this.bidirectional&&q>f;Z(this,l,w?f:q,y,a,b,w?q:f)}}}}this.fastupdate||this.reg.add(a)}}return this};
+function Z(a,c,b,e,d,f,g){let k=g?a.ctx:a.map,h;if(!c[b]||g&&!(h=c[b])[g])g?(c=h||(c[b]=C()),c[g]=1,(h=k.get(g))?k=h:k.set(g,k=new Map)):c[b]=1,(h=k.get(b))?k=h:k.set(b,k=[]),k=k[e]||(k[e]=[]),f&&k.includes(d)||(k.push(d),a.fastupdate&&((c=a.reg.get(d))?c.push(k):a.reg.set(d,[k])))}function Xa(a,c,b,e,d){return b&&1<a?c+(e||0)<=a?b+(d||0):(a-1)/(c+(e||0))*(b+(d||0))+1|0:0};O.prototype.search=function(a,c,b){b||(!c&&H(a)?(b=a,a=""):H(c)&&(b=c,c=0));var e=[],d=0;if(b){a=b.query||a;c=b.limit||c;d=b.offset||0;var f=b.context;var g=b.suggest;var k=!0;var h=b.resolution}else k=!0;a=this.encoder.encode(a);b=a.length;c=c||(k?100:0);if(1===b)return g=c,(c=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||"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(),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],h="";for(let m=0,n;m<g.length;m++){n=g[m]||[""];var k="";for(var l=0;l<n.length;l++)k+=(k?",":"")+("string"===b?'"'+n[l]+'"':n[l]);k="["+k+"]";h+=(h?",":"")+k}h='["'+f+'",['+h+"]]";e+=(e?",":"")+h}e="index.map=new Map(["+e+"]);";d="";for(const m of this.ctx.entries()){f=
-m[0];g=m[1];for(const n of g.entries()){g=n[0];h=n[1];k="";for(let t=0,p;t<h.length;t++){p=h[t]||[""];l="";for(let q=0;q<p.length;q++)l+=(l?",":"")+("string"===b?'"'+p[q]+'"':p[q]);l="["+l+"]";k+=(k?",":"")+l}k='new Map([["'+g+'",['+k+"]]])";k='["'+f+'",'+k+"]";d+=(d?",":"")+k}}d="index.ctx=new Map(["+d+"]);";return a?"function inject(index){"+c+e+d+"}":c+e+d};ja(O.prototype);const cb={Index:O,Charset:Va,Encoder:K,Document:V,Worker:null,Resolver:null,IndexedDB:null,Language:{}},db="undefined"!==typeof self?self:"undefined"!==typeof global?global:"undefined"!==typeof window?window:{};let eb;(eb=db.define)&&eb.amd?eb([],function(){return cb}):"object"===typeof db.exports?db.exports=cb:db.FlexSearch=cb;}(this||self));
+v.serialize=function(a=!0){if(!this.reg.size)return"";let c="",b="";for(var e of this.reg.keys())b||(b=typeof e),c+=(c?",":"")+("string"===b?'"'+e+'"':e);c="index.reg=new Set(["+c+"]);";e="";for(var d of this.map.entries()){var f=d[0],g=d[1],k="";for(let m=0,n;m<g.length;m++){n=g[m]||[""];var h="";for(var l=0;l<n.length;l++)h+=(h?",":"")+("string"===b?'"'+n[l]+'"':n[l]);h="["+h+"]";k+=(k?",":"")+h}k='["'+f+'",['+k+"]]";e+=(e?",":"")+k}e="index.map=new Map(["+e+"]);";d="";for(const m of this.ctx.entries()){f=
+m[0];g=m[1];for(const n of g.entries()){g=n[0];k=n[1];h="";for(let t=0,p;t<k.length;t++){p=k[t]||[""];l="";for(let q=0;q<p.length;q++)l+=(l?",":"")+("string"===b?'"'+p[q]+'"':p[q]);l="["+l+"]";h+=(h?",":"")+l}h='new Map([["'+g+'",['+h+"]]])";h='["'+f+'",'+h+"]";d+=(d?",":"")+h}}d="index.ctx=new Map(["+d+"]);";return a?"function inject(index){"+c+e+d+"}":c+e+d};ja(O.prototype);const bb={Index:O,Charset:Va,Encoder:K,Document:V,Worker:null,Resolver:null,IndexedDB:null,Language:{}},cb="undefined"!==typeof self?self:"undefined"!==typeof global?global:"undefined"!==typeof window?window:{};let db;(db=cb.define)&&db.amd?db([],function(){return bb}):"object"===typeof cb.exports?cb.exports=bb:cb.FlexSearch=bb;}(this||self));
diff --git a/dist/flexsearch.compact.module.debug.js b/dist/flexsearch.compact.module.debug.js
index 87caca9..55eb7d0 100644
--- a/dist/flexsearch.compact.module.debug.js
+++ b/dist/flexsearch.compact.module.debug.js
@@ -1,19 +1,19 @@
 /**!
- * FlexSearch.js v0.8.108 (Bundle/Debug)
+ * FlexSearch.js v0.8.109 (Bundle/Debug)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
  * https://github.com/nextapps-de/flexsearch
  */
 var w;
-function A(a, c, b) {
+function B(a, c, b) {
   const e = typeof b, d = typeof a;
   if ("undefined" !== e) {
     if ("undefined" !== d) {
       if (b) {
         if ("function" === d && e === d) {
-          return function(h) {
-            return a(b(h));
+          return function(k) {
+            return a(b(k));
           };
         }
         c = a.constructor;
@@ -88,7 +88,7 @@ function K(a) {
 }
 w = K.prototype;
 w.assign = function(a) {
-  this.normalize = A(a.normalize, !0, this.normalize);
+  this.normalize = B(a.normalize, !0, this.normalize);
   let c = a.include, b = c || a.exclude || a.split, e;
   if (b || "" === b) {
     if ("object" === typeof b && b.constructor !== RegExp) {
@@ -111,28 +111,28 @@ w.assign = function(a) {
     } else {
       this.split = b, e = !1 === b || 2 > "a1a".split(b).length;
     }
-    this.numeric = A(a.numeric, e);
+    this.numeric = B(a.numeric, e);
   } else {
     try {
-      this.split = A(this.split, ca);
+      this.split = B(this.split, ca);
     } catch (d) {
       console.warn("This platform does not support unicode regex. It falls back to using simple whitespace splitter instead: /s+/."), this.split = /\s+/;
     }
-    this.numeric = A(a.numeric, A(this.numeric, !0));
+    this.numeric = B(a.numeric, B(this.numeric, !0));
   }
-  this.prepare = A(a.prepare, null, this.prepare);
-  this.finalize = A(a.finalize, null, this.finalize);
+  this.prepare = B(a.prepare, null, this.prepare);
+  this.finalize = B(a.finalize, null, this.finalize);
   ha || (this.mapper = new Map(ba));
-  this.rtl = A(a.rtl, !1, this.rtl);
-  this.dedupe = A(a.dedupe, !1, this.dedupe);
-  this.filter = A((b = a.filter) && new Set(b), null, this.filter);
-  this.matcher = A((b = a.matcher) && new Map(b), null, this.matcher);
-  this.mapper = A((b = a.mapper) && new Map(b), null, this.mapper);
-  this.stemmer = A((b = a.stemmer) && new Map(b), null, this.stemmer);
-  this.replacer = A(a.replacer, null, this.replacer);
-  this.minlength = A(a.minlength, 1, this.minlength);
-  this.maxlength = A(a.maxlength, 0, this.maxlength);
-  if (this.cache = b = A(a.cache, !0, this.cache)) {
+  this.rtl = B(a.rtl, !1, this.rtl);
+  this.dedupe = B(a.dedupe, !1, this.dedupe);
+  this.filter = B((b = a.filter) && new Set(b), null, this.filter);
+  this.matcher = B((b = a.matcher) && new Map(b), null, this.matcher);
+  this.mapper = B((b = a.mapper) && new Map(b), null, this.mapper);
+  this.stemmer = B((b = a.stemmer) && new Map(b), null, this.stemmer);
+  this.replacer = B(a.replacer, null, this.replacer);
+  this.minlength = B(a.minlength, 1, this.minlength);
+  this.maxlength = B(a.maxlength, 0, this.maxlength);
+  if (this.cache = b = B(a.cache, !0, this.cache)) {
     this.H = null, this.R = "number" === typeof b ? b : 2e5, this.F = new Map(), this.G = new Map(), this.L = this.K = 128;
   }
   this.h = "";
@@ -215,8 +215,8 @@ w.encode = function(a) {
   this.numeric && 3 < a.length && (a = a.replace(ea, "$1 $2").replace(fa, "$1 $2").replace(da, "$1 "));
   const c = !(this.dedupe || this.mapper || this.filter || this.matcher || this.stemmer || this.replacer);
   let b = [], e = this.split || "" === this.split ? a.split(this.split) : a;
-  for (let f = 0, g, h; f < e.length; f++) {
-    if ((g = h = e[f]) && !(g.length < this.minlength)) {
+  for (let f = 0, g, k; f < e.length; f++) {
+    if ((g = k = e[f]) && !(g.length < this.minlength)) {
       if (c) {
         b.push(g);
       } else {
@@ -232,21 +232,21 @@ w.encode = function(a) {
               this.H = setTimeout(L, 50, this);
             }
           }
-          this.stemmer && 2 < g.length && (this.N || (this.N = new RegExp("(?!^)(" + this.D + ")$")), g = g.replace(this.N, k => this.stemmer.get(k)), g.length < this.minlength || this.filter && this.filter.has(g)) && (g = "");
+          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 k = 0, l = "", m, n; k < g.length; k++) {
-              m = g.charAt(k), m === l && this.dedupe || ((n = this.mapper && this.mapper.get(m)) || "" === n ? n === l && this.dedupe || !(l = n) || (d += n) : d += l = m);
+            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, k => this.matcher.get(k)));
+          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 && h.length <= this.L && (this.G.set(h, g), this.G.size > this.R && (this.G.clear(), this.L = this.L / 1.1 | 0));
+          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);
         }
       }
@@ -274,8 +274,20 @@ async function ia(a) {
       break;
     default:
       let d;
-      "export" === c && (e = [N.export]);
-      "import" === c ? await N.import.call(M, M) : d = M[c].apply(M, e);
+      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 = [N.export];
+      }
+      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".');
+        }
+        await N.import.call(M, M);
+      } else {
+        d = M[c].apply(M, e);
+      }
       postMessage("search" === c ? {id:b, msg:d} : {id:b});
   }
 }
@@ -319,19 +331,19 @@ function P(a) {
 ;let T = 0;
 function ma(a = {}) {
   function c(g) {
-    function h(k) {
-      k = k.data || k;
-      const l = k.id, m = l && d.h[l];
-      m && (m(k.msg), delete d.h[l]);
+    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", h) : this.worker.onmessage = h;
+      e ? this.worker.on("message", k) : this.worker.onmessage = k;
       if (a.config) {
-        return new Promise(function(k) {
+        return new Promise(function(h) {
           d.h[++T] = function() {
-            k(d);
+            h(d);
           };
           d.worker.postMessage({id:T, task:"init", factory:b, options:a});
         });
@@ -424,18 +436,18 @@ function ta(a, c) {
   return c;
 }
 function ua(a, c, b, e, d, f, g = 0) {
-  const h = e && e.constructor === Array;
-  var k = h ? e.shift() : e;
-  if (!k) {
+  const k = e && e.constructor === Array;
+  var h = k ? e.shift() : e;
+  if (!h) {
     return this.export(a, c, d, f + 1);
   }
-  if ((k = a((c ? c + "." : "") + (g + 1) + "." + b, JSON.stringify(k))) && k.then) {
+  if ((h = a((c ? c + "." : "") + (g + 1) + "." + b, JSON.stringify(h))) && h.then) {
     const l = this;
-    return k.then(function() {
-      return ua.call(l, a, c, b, h ? e : null, d, f, g + 1);
+    return h.then(function() {
+      return ua.call(l, a, c, b, k ? e : null, d, f, g + 1);
     });
   }
-  return ua.call(this, a, c, b, h ? e : null, d, f, g + 1);
+  return ua.call(this, a, c, b, k ? e : null, d, f, g + 1);
 }
 ;V.prototype.add = function(a, c, b) {
   H(a) && (c = a, a = J(c, this.key));
@@ -443,15 +455,15 @@ function ua(a, c, b, e, d, f, g = 0) {
     if (!b && this.reg.has(a)) {
       return this.update(a, c);
     }
-    for (let h = 0, k; h < this.field.length; h++) {
-      k = this.C[h];
-      var e = this.index.get(this.field[h]);
-      if ("function" === typeof k) {
-        var d = k(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 = k.I, !d || d(c)) {
-          k.constructor === String ? k = ["" + k] : D(k) && (k = [k]), va(c, k, this.J, 0, e, a, k[0], b);
+        if (d = h.I, !d || d(c)) {
+          h.constructor === String ? h = ["" + h] : D(h) && (h = [h]), va(c, h, this.J, 0, e, a, h[0], b);
         }
       }
     }
@@ -459,14 +471,14 @@ function ua(a, c, b, e, d, f, g = 0) {
       for (e = 0; e < this.B.length; e++) {
         var f = this.B[e], g = this.T[e];
         d = this.tag.get(g);
-        let h = C();
+        let k = C();
         if ("function" === typeof f) {
           if (f = f(c), !f) {
             continue;
           }
         } else {
-          const k = f.I;
-          if (k && !k(c)) {
+          const h = f.I;
+          if (h && !h(c)) {
             continue;
           }
           f.constructor === String && (f = "" + f);
@@ -474,8 +486,8 @@ function ua(a, c, b, e, d, f, g = 0) {
         }
         if (d && f) {
           D(f) && (f = [f]);
-          for (let k = 0, l, m; k < f.length; k++) {
-            l = f[k], h[l] || (h[l] = 1, (g = d.get(l)) ? m = g : d.set(l, m = []), b && m.includes(a) || (m.push(a), this.fastupdate && ((g = this.reg.get(a)) ? g.push(m) : this.reg.set(a, [m]))));
+          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]))));
           }
         } else {
           d || console.warn("Tag '" + g + "' was not found");
@@ -483,11 +495,11 @@ function ua(a, c, b, e, d, f, g = 0) {
       }
     }
     if (this.store && (!b || !this.store.has(a))) {
-      let h;
+      let k;
       if (this.A) {
-        h = C();
-        for (let k = 0, l; k < this.A.length; k++) {
-          l = this.A[k];
+        k = C();
+        for (let h = 0, l; h < this.A.length; h++) {
+          l = this.A[h];
           if ((b = l.I) && !b(c)) {
             continue;
           }
@@ -499,13 +511,13 @@ function ua(a, c, b, e, d, f, g = 0) {
             }
             l = [l.U];
           } else if (D(l) || l.constructor === String) {
-            h[l] = c[l];
+            k[l] = c[l];
             continue;
           }
-          wa(c, h, l, 0, l[0], m);
+          wa(c, k, l, 0, l[0], m);
         }
       }
-      this.store.set(a, h || c);
+      this.store.set(a, k || c);
     }
   }
   return this;
@@ -524,7 +536,7 @@ function wa(a, c, b, e, d, f) {
     }
   }
 }
-function va(a, c, b, e, d, f, g, h) {
+function va(a, c, b, e, d, f, g, k) {
   if (a = a[g]) {
     if (e === c.length - 1) {
       if (a.constructor === Array) {
@@ -536,27 +548,27 @@ function va(a, c, b, e, d, f, g, h) {
         }
         a = a.join(" ");
       }
-      d.add(f, a, h, !0);
+      d.add(f, a, k, !0);
     } else {
       if (a.constructor === Array) {
         for (g = 0; g < a.length; g++) {
-          va(a, c, b, e, d, f, g, h);
+          va(a, c, b, e, d, f, g, k);
         }
       } else {
-        g = c[++e], va(a, c, b, e, d, f, g, h);
+        g = c[++e], va(a, c, b, e, d, f, g, k);
       }
     }
   }
 }
 ;function xa(a, c, b, e, d) {
   const f = a.length;
-  let g = [], h, k;
-  h = C();
+  let g = [], k, h;
+  k = C();
   for (let l = 0, m, n, t, p; l < c; l++) {
     for (let q = 0; q < f; q++) {
       if (t = a[q], l < t.length && (m = t[l])) {
         for (let y = 0; y < m.length; y++) {
-          n = m[y], (k = h[n]) ? h[n]++ : (k = 0, h[n] = 1), p = g[k] || (g[k] = []), p.push(n);
+          n = m[y], (h = k[n]) ? k[n]++ : (h = 0, k[n] = 1), p = g[h] || (g[h] = []), p.push(n);
         }
       }
     }
@@ -582,10 +594,10 @@ function ya(a, c, b) {
   const e = [], d = C();
   let f;
   var g = a.length;
-  let h;
-  for (let k = g - 1; 0 <= k; k--) {
-    if (h = (g = a[k]) && g.length) {
-      for (let l = 0; l < h; l++) {
+  let k;
+  for (let h = g - 1; 0 <= h; h--) {
+    if (k = (g = a[h]) && g.length) {
+      for (let l = 0; l < k; l++) {
         if (f = g[l], !d[f]) {
           if (d[f] = 1, b) {
             b--;
@@ -600,26 +612,18 @@ function ya(a, c, b) {
   }
   return e;
 }
-function za(a, c, b) {
-  const e = C(), d = [];
-  for (let f = 0, g; f < c.length; f++) {
-    g = c[f];
-    for (let h = 0; h < g.length; h++) {
-      e[g[h]] = 1;
+function za(a, c) {
+  const b = C(), e = [];
+  for (let d = 0, f; d < c.length; d++) {
+    f = c[d];
+    for (let g = 0; g < f.length; g++) {
+      b[f[g]] = 1;
     }
   }
-  if (b) {
-    for (let f = 0, g; f < a.length; f++) {
-      g = a[f], e[g] && (d.push(g), e[g] = 0);
-    }
-  } else {
-    for (let f = 0, g, h; f < a.result.length; f++) {
-      for (g = a.result[f], c = 0; c < g.length; c++) {
-        h = g[c], e[h] && ((d[f] || (d[f] = [])).push(h), e[h] = 0);
-      }
-    }
+  for (let d = 0, f; d < a.length; d++) {
+    f = a[d], b[f] && (e.push(f), b[f] = 0);
   }
-  return d;
+  return e;
 }
 ;function Aa(a, c, b, e) {
   if (!a.length) {
@@ -629,21 +633,21 @@ function za(a, c, b) {
     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, h; f < a.length; f++) {
-    if ((g = a[f]) && (h = g.length)) {
+  for (let f = 0, g, k; f < a.length; f++) {
+    if ((g = a[f]) && (k = g.length)) {
       if (b) {
-        if (b >= h) {
-          b -= h;
+        if (b >= k) {
+          b -= k;
           continue;
         }
-        b < h && (g = c ? g.slice(b, b + c) : g.slice(b), h = g.length, b = 0);
+        b < k && (g = c ? g.slice(b, b + c) : g.slice(b), k = g.length, b = 0);
       }
-      h > c && (g = g.slice(0, c), h = c);
-      if (!d.length && h >= c) {
+      k > c && (g = g.slice(0, c), k = c);
+      if (!d.length && k >= c) {
         return e ? W.call(this, g) : g;
       }
       d.push(g);
-      c -= h;
+      c -= k;
       if (!c) {
         break;
       }
@@ -663,7 +667,7 @@ function za(a, c, b) {
     return a[c].apply(a, e);
   }
   e = [];
-  let d = [], f = 0, g = 0, h, k, l;
+  let d = [], f = 0, g = 0, k, h, l;
   for (let m = 0, n; m < b.length; m++) {
     if (n = b[m]) {
       let t;
@@ -672,8 +676,8 @@ function za(a, c, b) {
       } else if (n.constructor === Array) {
         t = n;
       } else {
-        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, t = n.index.search(n).result, n.resolve = k, n.enrich = h;
+        if (f = n.limit || 0, g = n.offset || 0, l = n.suggest, h = n.resolve, k = n.enrich && h, n.index) {
+          n.resolve = !1, n.enrich = !1, t = n.index.search(n).result, n.resolve = h, n.enrich = k;
         } else if (n.and) {
           t = a.and(n.and);
         } else if (n.or) {
@@ -696,7 +700,7 @@ function za(a, c, b) {
       }
     }
   }
-  return {O:e, P:d, limit:f, offset:g, enrich:h, resolve:k, suggest:l};
+  return {O:e, P:d, limit:f, offset:g, enrich:k, resolve:h, suggest:l};
 }
 ;X.prototype.or = function() {
   const {O:a, P:c, limit:b, offset:e, enrich:d, resolve:f} = Ba(this, "or", arguments);
@@ -705,10 +709,10 @@ function za(a, c, b) {
 function Ca(a, c, b, e, d, f) {
   if (c.length) {
     const g = this;
-    return Promise.all(c).then(function(h) {
+    return Promise.all(c).then(function(k) {
       a = [];
-      for (let k = 0, l; k < h.length; k++) {
-        (l = h[k]).length && (a[k] = l);
+      for (let h = 0, l; h < k.length; h++) {
+        (l = k[h]).length && (a[h] = l);
       }
       return Ca.call(g, a, [], b, e, d, f);
     });
@@ -723,20 +727,20 @@ function Ca(a, c, b, e, d, f) {
     f && (a = !!f.suggest, d = f.resolve, c = f.limit, b = f.offset, e = f.enrich && d);
   }
   if (a) {
-    const {O:f, P:g, limit:h, offset:k, enrich:l, resolve:m, suggest:n} = Ba(this, "and", arguments);
-    return Da.call(this, f, g, h, k, 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 Da(a, c, b, e, d, f, g) {
   if (c.length) {
-    const h = this;
-    return Promise.all(c).then(function(k) {
+    const k = this;
+    return Promise.all(c).then(function(h) {
       a = [];
-      for (let l = 0, m; l < k.length; l++) {
-        (m = k[l]).length && (a[l] = m);
+      for (let l = 0, m; l < h.length; l++) {
+        (m = h[l]).length && (a[l] = m);
       }
-      return Da.call(h, a, [], b, e, d, f, g);
+      return Da.call(k, a, [], b, e, d, f, g);
     });
   }
   if (a.length) {
@@ -759,13 +763,13 @@ function Da(a, c, b, e, d, f, g) {
 };
 function Ea(a, c, b, e, d, f, g) {
   if (c.length) {
-    const h = this;
-    return Promise.all(c).then(function(k) {
+    const k = this;
+    return Promise.all(c).then(function(h) {
       a = [];
-      for (let l = 0, m; l < k.length; l++) {
-        (m = k[l]).length && (a[l] = m);
+      for (let l = 0, m; l < h.length; l++) {
+        (m = h[l]).length && (a[l] = m);
       }
-      return Ea.call(h, a, [], b, e, d, f, g);
+      return Ea.call(k, a, [], b, e, d, f, g);
     });
   }
   if (a.length) {
@@ -781,10 +785,10 @@ function Ea(a, c, b, e, d, f, g) {
 }
 function Fa(a, c, b, e, d) {
   const f = [], g = C();
-  let h = 0;
-  for (let k = 0, l; k < a.length; k++) {
-    if (l = a[k]) {
-      h < l.length && (h = l.length);
+  let k = 0;
+  for (let h = 0, l; h < a.length; h++) {
+    if (l = a[h]) {
+      k < l.length && (k = l.length);
       for (let m = 0, n; m < l.length; m++) {
         if (n = l[m]) {
           for (let t = 0, p; t < n.length; t++) {
@@ -794,10 +798,10 @@ function Fa(a, c, b, e, d) {
       }
     }
   }
-  for (let k = 0, l, m = 0; k < h; k++) {
+  for (let h = 0, l, m = 0; h < k; h++) {
     for (let n = 0, t; n < a.length; n++) {
       if (t = a[n]) {
-        if (l = t[k]) {
+        if (l = t[h]) {
           for (let p = 0, q; p < l.length; p++) {
             if (q = l[p], 1 === g[q]) {
               if (b) {
@@ -808,7 +812,7 @@ function Fa(a, c, b, e, d) {
                     return f;
                   }
                 } else {
-                  const y = k + (n ? d : 0);
+                  const y = h + (n ? d : 0);
                   f[y] || (f[y] = []);
                   f[y].push(q);
                   if (++m === c) {
@@ -830,13 +834,13 @@ function Fa(a, c, b, e, d) {
 };
 function Ga(a, c, b, e, d, f, g) {
   if (c.length) {
-    const h = this;
-    return Promise.all(c).then(function(k) {
+    const k = this;
+    return Promise.all(c).then(function(h) {
       a = [];
-      for (let l = 0, m; l < k.length; l++) {
-        (m = k[l]).length && (a[l] = m);
+      for (let l = 0, m; l < h.length; l++) {
+        (m = h[l]).length && (a[l] = m);
       }
-      return Ga.call(h, a, [], b, e, d, f, g);
+      return Ga.call(k, a, [], b, e, d, f, g);
     });
   }
   if (a.length && this.result.length) {
@@ -849,10 +853,10 @@ function Ga(a, c, b, e, d, f, g) {
 function Ha(a, c, b, e) {
   const d = [];
   a = new Set(a.flat().flat());
-  for (let f = 0, g, h = 0; f < this.result.length; f++) {
+  for (let f = 0, g, k = 0; f < this.result.length; f++) {
     if (g = this.result[f]) {
-      for (let k = 0, l; k < g.length; k++) {
-        if (l = g[k], !a.has(l)) {
+      for (let h = 0, l; h < g.length; h++) {
+        if (l = g[h], !a.has(l)) {
           if (b) {
             b--;
           } else {
@@ -861,7 +865,7 @@ function Ha(a, c, b, e) {
                 return d;
               }
             } else {
-              if (d[f] || (d[f] = []), d[f].push(l), ++h === c) {
+              if (d[f] || (d[f] = []), d[f].push(l), ++k === c) {
                 return d;
               }
             }
@@ -928,15 +932,15 @@ V.prototype.search = function(a, c, b, e) {
   b || (!c && H(a) ? (b = a, a = "") : H(c) && (b = c, c = 0));
   let d = [];
   var f = [];
-  let g, h, k, l, m, n, t = 0, p, q;
+  let g, k, h, l, m, n, t = 0, p, q;
   if (b) {
     b.constructor === Array && (b = {index:b});
     a = b.query || a;
     var y = b.pluck;
-    h = b.merge;
+    k = b.merge;
     l = y || b.field || (l = b.index) && (l.index ? null : l);
     m = this.tag && b.tag;
-    k = b.suggest;
+    h = b.suggest;
     p = !0;
     this.store && b.enrich && !p && console.warn("Enrich results can only be done on a final resolver task or when calling .resolve({ enrich: true })");
     g = this.store && b.enrich && p;
@@ -963,13 +967,13 @@ V.prototype.search = function(a, c, b, e) {
           }
         } else {
           v = Object.keys(r);
-          for (let E = 0, F, B; E < v.length; E++) {
-            if (F = v[E], B = r[F], B.constructor === Array) {
-              for (z = 0; z < B.length; z++) {
-                u.push(F, B[z]);
+          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]);
               }
             } else {
-              u.push(F, B);
+              u.push(F, A);
             }
           }
         }
@@ -999,12 +1003,12 @@ V.prototype.search = function(a, c, b, e) {
   u = !e && (this.worker || this.db) && [];
   for (let x = 0, r, E, F; x < l.length; x++) {
     E = l[x];
-    let B;
-    D(E) || (B = E, E = B.field, a = B.query || a, c = B.limit || c, n = B.offset || n, k = B.suggest || k, g = this.store && (B.enrich || g));
+    let A;
+    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 = B || b, z = this.index.get(E), 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;
@@ -1016,25 +1020,25 @@ V.prototype.search = function(a, c, b, e) {
     if (m && F) {
       v = [];
       z = 0;
-      for (let G = 0, I, Xa; G < m.length; G += 2) {
+      for (let G = 0, I, Wa; G < m.length; G += 2) {
         I = this.tag.get(m[G]);
         if (!I) {
-          if (console.warn("Tag '" + m[G] + ":" + m[G + 1] + "' will be skipped because there is no field '" + m[G] + "'."), k) {
+          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 X(d);
           }
         }
-        if (Xa = (I = I && I.get(m[G + 1])) && I.length) {
+        if (Wa = (I = I && I.get(m[G + 1])) && I.length) {
           z++, v.push(I);
-        } else if (!k) {
+        } else if (!h) {
           return p ? d : new X(d);
         }
       }
       if (z) {
-        r = za(r, v, p);
+        r = za(r, v);
         F = r.length;
-        if (!F && !k) {
+        if (!F && !h) {
           return p ? r : new X(r);
         }
         z--;
@@ -1067,18 +1071,18 @@ V.prototype.search = function(a, c, b, e) {
     }
     d[x] = {field:f[x], result:r};
   }
-  return h ? Ja(d, c) : q ? Ka(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 Ka(a, c, b, e, d, f) {
-  let g, h, k;
+  let g, k, h;
   for (let m = 0, n, t, p, q, y; m < a.length; m++) {
     n = a[m].result;
     t = a[m].field;
     q = b.get(t);
     p = q.encoder;
-    k = q.tokenize;
+    h = q.tokenize;
     y = d[e.indexOf(t)];
-    p !== g && (g = p, h = g.encode(c));
+    p !== g && (g = p, k = g.encode(c));
     for (let u = 0; u < n.length; u++) {
       let v = "";
       var l = J(n[u].doc, y);
@@ -1088,8 +1092,8 @@ function Ka(a, c, b, e, d, f) {
         r = z[x];
         E = l[x];
         let F;
-        for (let B = 0, G; B < h.length; B++) {
-          if (G = h[B], "strict" === k) {
+        for (let A = 0, G; A < k.length; A++) {
+          if (G = k[A], "strict" === h) {
             if (r === G) {
               v += (v ? " " : "") + f.replace("$1", E);
               F = !0;
@@ -1116,14 +1120,14 @@ function Ja(a, c) {
   for (let d = 0, f, g; d < a.length; d++) {
     f = a[d];
     g = f.result;
-    for (let h = 0, k, l, m; h < g.length; h++) {
-      if (l = g[h], k = l.id, m = e[k]) {
+    for (let k = 0, h, l, m; k < g.length; k++) {
+      if (l = g[k], h = l.id, m = e[h]) {
         m.push(f.field);
       } else {
         if (b.length === c) {
           return b;
         }
-        l.field = e[k] = [f.field];
+        l.field = e[h] = [f.field];
         b.push(l);
       }
     }
@@ -1271,9 +1275,9 @@ w.export = function(a, c, b = 0, e = 0) {
   if (b < this.field.length) {
     const g = this.field[b];
     if ((c = this.index.get(g).export(a, g, b, e = 1)) && c.then) {
-      const h = this;
+      const k = this;
       return c.then(function() {
-        return h.export(a, g, b + 1);
+        return k.export(a, g, b + 1);
       });
     }
     return this.export(a, g, b + 1);
@@ -1396,7 +1400,7 @@ var Va = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:Na, LatinSimple:{no
 }}, 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}}};
+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)) {
@@ -1414,34 +1418,34 @@ O.prototype.add = function(a, c, b, e) {
             case "full":
               if (2 < d) {
                 for (f = 0; f < d; f++) {
-                  for (var h = d; h > f; h--) {
-                    g = q.substring(f, h);
-                    var k = this.score ? this.score(c, q, p, g, f) : Ya(t, e, p, d, f);
-                    Z(this, m, g, k, a, b);
+                  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 (h = d - 1; 0 < h; h--) {
-                  g = q[h] + g, k = this.score ? this.score(c, q, p, g, h) : Ya(t, e, p, d, h), Z(this, m, g, k, a, b);
+                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 (h = 0; h < d; h++) {
-                  g += q[h], Z(this, m, g, f, a, b);
+                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, h = Math.min(n + 1, e - p), d[f] = 1, k = 1; k < h; k++) {
-                  if ((q = c[this.rtl ? e - 1 - p - k : p + k]) && !d[q]) {
+                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, k) : Ya(g + (e / 2 > g ? 0 : 1), e, p, h - 1, k - 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);
                   }
                 }
@@ -1455,9 +1459,9 @@ O.prototype.add = function(a, c, b, e) {
   return this;
 };
 function Z(a, c, b, e, d, f, g) {
-  let h = g ? a.ctx : a.map, k;
-  if (!c[b] || g && !(k = c[b])[g]) {
-    g ? (c = k || (c[b] = C()), c[g] = 1, (k = h.get(g)) ? h = k : h.set(g, h = new Map())) : c[b] = 1, (k = h.get(b)) ? h = k : h.set(b, h = []), h = h[e] || (h[e] = []), f && h.includes(d) || (h.push(d), a.fastupdate && ((c = a.reg.get(d)) ? c.push(h) : a.reg.set(d, [h])));
+  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) {
@@ -1472,35 +1476,35 @@ function Ya(a, c, b, e, d) {
     d = b.offset || 0;
     var f = b.context;
     var g = b.suggest;
-    var h = !0;
-    var k = b.resolution;
+    var k = !0;
+    var h = b.resolution;
   } else {
-    h = !0;
+    k = !0;
   }
-  b = this.encoder.encode(a);
-  a = b.length;
-  c = c || (h ? 100 : 0);
-  if (1 === a) {
-    return Za.call(this, b[0], "", c, d, h);
+  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 === a && f && !g) {
-    return Za.call(this, b[0], b[1], c, d, h);
+  if (2 === b && f && !g) {
+    return g = c, (c = Za(this, a[0], a[1])) && c.length ? Aa.call(this, c, g, d) : [];
   }
-  h = C();
+  k = C();
   let l = 0;
-  if (1 < a && f) {
-    var m = b[0];
+  if (1 < b && f) {
+    var m = a[0];
     l = 1;
   }
-  k || 0 === k || (k = m ? this.S : this.resolution);
-  for (let q, y; l < a; l++) {
-    if ((y = b[l]) && !h[y]) {
-      h[y] = 1;
-      q = $a(this, y, m);
+  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 = k;
+        var n = e, t = g, p = h;
         let u = [];
         if (f && f.length) {
           if (f.length <= p) {
@@ -1527,27 +1531,23 @@ function Ya(a, c, b, e, d) {
       }
       m && (g && q && e.length || (m = y));
     }
-    g && m && l === a - 1 && !e.length && (m = "", l = -1, h = C());
+    g && m && l === b - 1 && !e.length && (m = "", l = -1, k = C());
   }
   a: {
-    m = e.length;
     a = e;
-    if (1 < m) {
-      a = xa(e, k, c, d, g);
-    } else if (1 === m) {
-      g = Aa.call(null, e[0], c, d);
+    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 = a;
+    g = m;
   }
   return g;
 };
-function Za(a, c, b, e, d) {
-  a = $a(this, a, c);
-  d = !0;
-  return a && a.length ? d ? Aa.call(this, a, b, e) : new X(a) : d ? [] : new X();
-}
-function $a(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);
@@ -1568,14 +1568,14 @@ function $a(a, c, b) {
         }
       }
     } else {
-      ab(this.map, a), this.depth && ab(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 ab(a, c) {
+function $a(a, c) {
   let b = 0;
   if (a.constructor === Array) {
     for (let e = 0, d, f; e < a.length; e++) {
@@ -1590,7 +1590,7 @@ function ab(a, c) {
     }
   } else {
     for (let e of a.entries()) {
-      const d = e[0], f = ab(e[1], c);
+      const d = e[0], f = $a(e[1], c);
       f ? b += f : a.delete(d);
     }
   }
@@ -1602,7 +1602,7 @@ function ab(a, c) {
   }
   if (a) {
     var b = D(a) ? a : a.preset;
-    b && (Wa[b] || console.warn("Preset not found: " + b), a = Object.assign({}, Wa[b], a));
+    b && (Xa[b] || console.warn("Preset not found: " + b), a = Object.assign({}, Xa[b], a));
   } else {
     a = {};
   }
@@ -1610,7 +1610,7 @@ function ab(a, c) {
   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 || "strict";
+  this.tokenize = (b = a.tokenize) && "default" !== b || "strict";
   this.depth = "strict" === b && e.depth || 0;
   this.bidirectional = !1 !== e.bidirectional;
   this.fastupdate = !!a.fastupdate;
@@ -1642,7 +1642,7 @@ 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 bb(a) {
+function ab(a) {
   let c = 0;
   if (a.constructor === Array) {
     for (let b = 0, e; b < a.length; b++) {
@@ -1650,7 +1650,7 @@ function bb(a) {
     }
   } else {
     for (const b of a) {
-      const e = b[0], d = bb(b[1]);
+      const e = b[0], d = ab(b[1]);
       d ? c += d : a.delete(e);
     }
   }
@@ -1660,8 +1660,8 @@ w.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
-  bb(this.map);
-  this.depth && bb(this.ctx);
+  ab(this.map);
+  this.depth && ab(this.ctx);
   return this;
 };
 w.searchCache = Ma;
@@ -1715,18 +1715,18 @@ w.serialize = function(a = !0) {
   c = "index.reg=new Set([" + c + "]);";
   e = "";
   for (var d of this.map.entries()) {
-    var f = d[0], g = d[1], h = "";
+    var f = d[0], g = d[1], k = "";
     for (let m = 0, n; m < g.length; m++) {
       n = g[m] || [""];
-      var k = "";
+      var h = "";
       for (var l = 0; l < n.length; l++) {
-        k += (k ? "," : "") + ("string" === b ? '"' + n[l] + '"' : n[l]);
+        h += (h ? "," : "") + ("string" === b ? '"' + n[l] + '"' : n[l]);
       }
-      k = "[" + k + "]";
-      h += (h ? "," : "") + k;
+      h = "[" + h + "]";
+      k += (k ? "," : "") + h;
     }
-    h = '["' + f + '",[' + h + "]]";
-    e += (e ? "," : "") + h;
+    k = '["' + f + '",[' + k + "]]";
+    e += (e ? "," : "") + k;
   }
   e = "index.map=new Map([" + e + "]);";
   d = "";
@@ -1735,20 +1735,20 @@ w.serialize = function(a = !0) {
     g = m[1];
     for (const n of g.entries()) {
       g = n[0];
-      h = n[1];
-      k = "";
-      for (let t = 0, p; t < h.length; t++) {
-        p = h[t] || [""];
+      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 + "]";
-        k += (k ? "," : "") + l;
+        h += (h ? "," : "") + l;
       }
-      k = 'new Map([["' + g + '",[' + k + "]]])";
-      k = '["' + f + '",' + k + "]";
-      d += (d ? "," : "") + k;
+      h = 'new Map([["' + g + '",[' + h + "]]])";
+      h = '["' + f + '",' + h + "]";
+      d += (d ? "," : "") + h;
     }
   }
   d = "index.ctx=new Map([" + d + "]);";
diff --git a/dist/flexsearch.compact.module.min.js b/dist/flexsearch.compact.module.min.js
index 5519abc..1230346 100644
--- a/dist/flexsearch.compact.module.min.js
+++ b/dist/flexsearch.compact.module.min.js
@@ -1,11 +1,11 @@
 /**!
- * FlexSearch.js v0.8.108 (Bundle)
+ * FlexSearch.js v0.8.109 (Bundle)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
  * https://github.com/nextapps-de/flexsearch
  */
-var v;function A(a,c,b){const e=typeof b,d=typeof a;if("undefined"!==e){if("undefined"!==d){if(b){if("function"===d&&e===d)return function(h){return a(b(h))};c=a.constructor;if(c===b.constructor){if(c===Array)return b.concat(a);if(c===Map){var 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}
+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",
@@ -13,59 +13,58 @@ function H(a){return"object"===typeof a}function I(a,c){if(D(c))a=a[c];else for(
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-function ab(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=ab(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)?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||"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 bb(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=bb(b[1]);d?c+=d:a.delete(e)}return c}v.cleanup=function(){if(!this.fastupdate)return this;bb(this.map);this.depth&&bb(this.ctx);return this};v.searchCache=Ma;
+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 Wa={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 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||"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(),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],h="";for(let m=0,n;m<g.length;m++){n=g[m]||[""];var k="";for(var l=0;l<n.length;l++)k+=(k?",":"")+("string"===b?'"'+n[l]+'"':n[l]);k="["+k+"]";h+=(h?",":"")+k}h='["'+f+'",['+h+"]]";e+=(e?",":"")+h}e="index.map=new Map(["+e+"]);";d="";for(const m of this.ctx.entries()){f=
-m[0];g=m[1];for(const n of g.entries()){g=n[0];h=n[1];k="";for(let t=0,p;t<h.length;t++){p=h[t]||[""];l="";for(let q=0;q<p.length;q++)l+=(l?",":"")+("string"===b?'"'+p[q]+'"':p[q]);l="["+l+"]";k+=(k?",":"")+l}k='new Map([["'+g+'",['+k+"]]])";k='["'+f+'",'+k+"]";d+=(d?",":"")+k}}d="index.ctx=new Map(["+d+"]);";return a?"function inject(index){"+c+e+d+"}":c+e+d};ja(O.prototype);export default {Index:O,Charset:Va,Encoder:K,Document:V,Worker:null,Resolver:null,IndexedDB:null,Language:{}};
-export const Index=O;export const Charset=Va;export const Encoder=K;export const Document=V;export const Worker=null;export const Resolver=null;export const IndexedDB=null;export const Language={};
\ No newline at end of file
+v.serialize=function(a=!0){if(!this.reg.size)return"";let c="",b="";for(var e of this.reg.keys())b||(b=typeof e),c+=(c?",":"")+("string"===b?'"'+e+'"':e);c="index.reg=new Set(["+c+"]);";e="";for(var d of this.map.entries()){var f=d[0],g=d[1],k="";for(let m=0,n;m<g.length;m++){n=g[m]||[""];var h="";for(var l=0;l<n.length;l++)h+=(h?",":"")+("string"===b?'"'+n[l]+'"':n[l]);h="["+h+"]";k+=(k?",":"")+h}k='["'+f+'",['+k+"]]";e+=(e?",":"")+k}e="index.map=new Map(["+e+"]);";d="";for(const m of this.ctx.entries()){f=
+m[0];g=m[1];for(const n of g.entries()){g=n[0];k=n[1];h="";for(let t=0,p;t<k.length;t++){p=k[t]||[""];l="";for(let q=0;q<p.length;q++)l+=(l?",":"")+("string"===b?'"'+p[q]+'"':p[q]);l="["+l+"]";h+=(h?",":"")+l}h='new Map([["'+g+'",['+h+"]]])";h='["'+f+'",'+h+"]";d+=(d?",":"")+h}}d="index.ctx=new Map(["+d+"]);";return a?"function inject(index){"+c+e+d+"}":c+e+d};ja(O.prototype);export default {Index:O,Charset:Wa,Encoder:K,Document:V,Worker:null,Resolver:null,IndexedDB:null,Language:{}};
+export const Index=O;export const Charset=Wa;export const Encoder=K;export const Document=V;export const Worker=null;export const Resolver=null;export const IndexedDB=null;export const Language={};
\ No newline at end of file
diff --git a/dist/flexsearch.es5.debug.js b/dist/flexsearch.es5.debug.js
index 1ffe88f..006608d 100644
--- a/dist/flexsearch.es5.debug.js
+++ b/dist/flexsearch.es5.debug.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.108 (ES5/Debug)
+ * FlexSearch.js v0.8.109 (ES5/Debug)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -1101,15 +1101,15 @@ function N(a) {
   a.B.clear();
   a.C.clear();
 }
-;var O, Ha;
-function Ia(a) {
+;var O, P;
+function Ha(a) {
   var b, c, d, e, g;
   return ta(function(f) {
     if (1 == f.h) {
       switch(a = a.data, b = a.task, c = a.id, d = a.args, b) {
         case "init":
-          Ha = a.options || {};
-          (e = a.factory) ? (Function("return " + e)()(self), O = new self.FlexSearch.Index(Ha), delete self.FlexSearch) : O = new R(Ha);
+          P = a.options || {};
+          (e = a.factory) ? (Function("return " + e)()(self), O = new self.FlexSearch.Index(P), delete self.FlexSearch) : O = new S(P);
           postMessage({id:c});
           break;
         default:
@@ -1118,43 +1118,51 @@ function Ia(a) {
       }
     } else {
       if (4 != f.h) {
-        "export" === b && (d = [Ha.export]);
+        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];
+        }
         if ("import" !== b) {
           g = O[b].apply(O, d);
           f.h = 4;
           return;
         }
-        return E(f, Ha.import.call(O, O), 4);
+        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), 4);
       }
       postMessage("search" === b ? {id:c, msg:g} : {id:c});
     }
     f.h = 0;
   });
 }
-;function Ja(a) {
-  Ma.call(a, "add");
-  Ma.call(a, "append");
-  Ma.call(a, "search");
-  Ma.call(a, "update");
-  Ma.call(a, "remove");
+;function Ia(a) {
+  Ja.call(a, "add");
+  Ja.call(a, "append");
+  Ja.call(a, "search");
+  Ja.call(a, "update");
+  Ja.call(a, "remove");
 }
-var Na, Oa, Pa = {}, Qa = {};
-function Ra(a) {
-  Na = 0;
-  Pa[a] = Qa[a];
+var Ma, Na, Oa = {}, Pa = {};
+function Qa(a) {
+  Ma = 0;
+  Oa[a] = Pa[a];
 }
-function Ma(a) {
+function Ja(a) {
   this[a + "Async"] = function() {
     var b = arguments, c = b[b.length - 1];
     if ("function" === typeof c) {
       var d = c;
       delete b[b.length - 1];
     }
-    Na || (Na = setTimeout(Ra, 0, a), Oa = Date.now());
-    Qa[a] || (Qa[a] = Pa[a] = 1000);
-    if (!--Pa[a]) {
-      Pa[a] = Qa[a] = Qa[a] * this.priority * this.priority * 3 / (Date.now() - Oa) | 0 || 1;
-      Na = clearTimeout(Na);
+    Ma || (Ma = setTimeout(Qa, 0, a), Na = Date.now());
+    Pa[a] || (Pa[a] = Oa[a] = 1000);
+    if (!--Oa[a]) {
+      Oa[a] = Pa[a] = Pa[a] * this.priority * this.priority * 3 / (Date.now() - Na) | 0 || 1;
+      Ma = clearTimeout(Ma);
       var e = this;
       return new Promise(function(f) {
         setTimeout(function() {
@@ -1170,8 +1178,8 @@ function Ma(a) {
     return c;
   };
 }
-;var Sa = 0;
-function S(a) {
+;var Ra = 0;
+function Sa(a) {
   function b(f) {
     function h(k) {
       k = k.data || k;
@@ -1184,10 +1192,10 @@ function S(a) {
       d ? this.worker.on("message", h) : this.worker.onmessage = h;
       if (a.config) {
         return new Promise(function(k) {
-          e.h[++Sa] = function() {
+          e.h[++Ra] = function() {
             k(e);
           };
-          e.worker.postMessage({id:Sa, task:"init", factory:c, options:a});
+          e.worker.postMessage({id:Ra, task:"init", factory:c, options:a});
         });
       }
       this.worker.postMessage({task:"init", factory:c, options:a});
@@ -1195,8 +1203,8 @@ function S(a) {
     }
   }
   a = void 0 === a ? {} : a;
-  if (!this || this.constructor !== S) {
-    return new S(a);
+  if (!this || this.constructor !== Sa) {
+    return new Sa(a);
   }
   var c = "undefined" !== typeof self ? self._factory : "undefined" !== typeof window ? window._factory : null;
   c && (c = c.toString());
@@ -1213,9 +1221,9 @@ T("remove");
 T("clear");
 T("export");
 T("import");
-Ja(S.prototype);
+Ia(Sa.prototype);
 function T(a) {
-  S.prototype[a] = function() {
+  Sa.prototype[a] = function() {
     var b = this, c = arguments, d, e, g, f, h;
     return ta(function(k) {
       d = b;
@@ -1223,15 +1231,15 @@ function T(a) {
       g = e[e.length - 1];
       "function" === typeof g && (f = g, e.splice(e.length - 1, 1));
       h = new Promise(function(l) {
-        d.h[++Sa] = l;
-        d.worker.postMessage({task:a, id:Sa, args:e});
+        d.h[++Ra] = l;
+        d.worker.postMessage({task:a, id:Ra, args:e});
       });
       return f ? (h.then(f), k.return(b)) : k.return(h);
     });
   };
 }
 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=" + Ia.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(K(c) ? c : (0,eval)("import.meta.url").replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", 
   "module/worker/worker.js"), {type:"module"});
 }
 ;function Ua(a, b) {
@@ -2152,9 +2160,9 @@ W.prototype.search = function(a, b, c, d) {
             e.push({field:r[g], tag:r[g + 1], result:h});
           }
         }
-        return p.length ? Promise.all(p).then(function(P) {
-          for (var Q = 0; Q < P.length; Q++) {
-            e[Q].result = P[Q];
+        return p.length ? Promise.all(p).then(function(Q) {
+          for (var R = 0; R < Q.length; R++) {
+            e[R].result = Q[R];
           }
           return e;
         }) : e;
@@ -2254,8 +2262,8 @@ W.prototype.search = function(a, b, c, d) {
       }
     }
     var Yb = this;
-    return Promise.all(r).then(function(P) {
-      return P.length ? Yb.search(a, b, c, P) : P;
+    return Promise.all(r).then(function(Q) {
+      return Q.length ? Yb.search(a, b, c, Q) : Q;
     });
   }
   if (!f) {
@@ -2276,9 +2284,9 @@ W.prototype.search = function(a, b, c, d) {
   }
   if (q && this.db && r.length) {
     var La = this;
-    return Promise.all(r).then(function(P) {
-      for (var Q = 0; Q < P.length; Q++) {
-        e[Q].result = P[Q];
+    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, La.index, La.field, La.J, t) : e;
     });
@@ -2366,7 +2374,8 @@ function X(a) {
   this.S = [];
   this.key = (c = b.key || b.id) && xb(c, this.S) || "id";
   (d = a.keystore || 0) && (this.keystore = d);
-  this.reg = (this.fastupdate = !!a.fastupdate) ? d ? new U(d) : new Map() : d ? new V(d) : new Set();
+  this.fastupdate = !!a.fastupdate;
+  this.reg = !this.fastupdate || a.worker || a.db ? d ? new V(d) : new Set() : d ? new U(d) : new Map();
   this.I = (c = b.store || null) && c && !0 !== c && [];
   this.store = c && (d ? new U(d) : new Map());
   this.cache = (c = a.cache || null) && new Z(c);
@@ -2393,6 +2402,7 @@ function X(a) {
     }
   }
   if (this.worker) {
+    this.fastupdate = !1;
     a = [];
     c = w(this.index.values());
     for (b = c.next(); !b.done; b = c.next()) {
@@ -2410,17 +2420,20 @@ function X(a) {
       });
     }
   } else {
-    a.db && this.mount(a.db);
+    a.db && (this.fastupdate = !1, this.mount(a.db));
   }
 }
 u = W.prototype;
 u.mount = function(a) {
+  if (this.worker) {
+    throw Error("You can't use Worker-Indexes on a persistent model. That would be useless, since each of the persistent model acts like Worker-Index by default (Master/Slave).");
+  }
   var b = this.field;
   if (this.tag) {
     for (var c = 0, d; c < this.aa.length; c++) {
       d = this.aa[c];
       var e;
-      this.index.set(d, e = new R({}, this.reg));
+      this.index.set(d, e = new S({}, this.reg));
       b === this.field && (b = b.slice(0));
       b.push(d);
       e.tag = this.tag.get(d);
@@ -2470,10 +2483,10 @@ function yb(a, b) {
     K(g) || (f = g, g = g.field);
     f = M(f) ? Object.assign({}, a, f) : a;
     if (this.worker) {
-      var h = new S(f);
+      var h = new Sa(f);
       c.set(g, h);
     }
-    this.worker || c.set(g, new R(f, this.reg));
+    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;
   }
@@ -2616,7 +2629,7 @@ u.import = function(a, b) {
     }
   }
 };
-Ja(W.prototype);
+Ia(W.prototype);
 function zb(a, b, c) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
   this.cache || (this.cache = new Z());
@@ -2682,7 +2695,7 @@ var Ib = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:Ab, LatinSimple:{no
   return ("" + a).replace(Hb, " ");
 }}};
 var Jb = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
-R.prototype.add = function(a, b, c, d) {
+S.prototype.add = function(a, b, c, d) {
   if (b && (a || 0 === a)) {
     if (!d && !c && this.reg.has(a)) {
       return this.update(a, b);
@@ -2761,7 +2774,7 @@ function Lb(a, b, c, d, e, g, f) {
 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) {
+;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;
   if (c) {
@@ -2894,7 +2907,7 @@ function Ob(a, 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) {
+;S.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) {
@@ -2937,9 +2950,9 @@ function Rb(a, b) {
   }
   return c;
 }
-;function R(a, b) {
-  if (!this || this.constructor !== R) {
-    return new R(a);
+;function S(a, b) {
+  if (!this || this.constructor !== S) {
+    return new S(a);
   }
   if (a) {
     var c = K(a) ? a : a.preset;
@@ -2951,7 +2964,7 @@ function Rb(a, b) {
   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 || "strict";
+  this.tokenize = (c = a.tokenize) && "default" !== c || "strict";
   this.depth = "strict" === c && d.depth || 0;
   this.bidirectional = !1 !== d.bidirectional;
   this.fastupdate = !!a.fastupdate;
@@ -2972,7 +2985,7 @@ function Rb(a, b) {
   this.commit_timer = null;
   this.priority = a.priority || 4;
 }
-u = R.prototype;
+u = S.prototype;
 u.mount = function(a) {
   this.commit_timer && (clearTimeout(this.commit_timer), this.commit_timer = null);
   return a.mount(this);
@@ -3127,7 +3140,7 @@ u.serialize = function(a) {
   e = "index.ctx=new Map([" + e + "]);";
   return a ? "function inject(index){" + b + d + e + "}" : b + d + e;
 };
-Ja(R.prototype);
+Ia(S.prototype);
 var Tb = "undefined" !== typeof window && (window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB), Ub = ["map", "ctx", "tag", "reg", "cfg"];
 function Vb(a, b) {
   b = void 0 === b ? {} : b;
@@ -3492,7 +3505,7 @@ function Wb(a) {
     a = null;
   });
 }
-;var $b = {Index:R, Charset:Ib, Encoder:Ga, Document:W, Worker:S, Resolver:Y, IndexedDB:Vb, Language:{}}, ac = "undefined" !== typeof self ? self : "undefined" !== typeof global ? global : "undefined" !== typeof window ? window : {}, bc;
+;var $b = {Index:S, Charset:Ib, Encoder:Ga, Document:W, Worker:Sa, Resolver:Y, IndexedDB:Vb, Language:{}}, ac = "undefined" !== typeof self ? self : "undefined" !== typeof global ? global : "undefined" !== typeof window ? window : {}, bc;
 (bc = ac.define) && bc.amd ? bc([], function() {
   return $b;
 }) : "object" === typeof ac.exports ? ac.exports = $b : ac.FlexSearch = $b;
diff --git a/dist/flexsearch.es5.min.js b/dist/flexsearch.es5.min.js
index ce05e76..5159704 100644
--- a/dist/flexsearch.es5.min.js
+++ b/dist/flexsearch.es5.min.js
@@ -1,5 +1,5 @@
 /**!
- * FlexSearch.js v0.8.108 (ES5)
+ * FlexSearch.js v0.8.109 (ES5)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
@@ -87,9 +87,9 @@ D.push(L);else if(!n)return p?e:new Y(e)}}if(F){v=lb(v,D,p);y=v.length;if(!y&&!n
 g.length;x++){n=e[x];q&&n.length&&!n[0].doc&&(this.db?t.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}}if(q&&this.db&&t.length){var La=this;return Promise.all(t).then(function(P){for(var Q=0;Q<P.length;Q++)e[Q].result=P[Q];return k?vb(e,b):r?wb(e,a,La.index,La.field,La.J,r):e})}return k?vb(e,b):r?wb(e,a,this.index,this.field,this.J,r):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="",r=ya(m[p].doc,n),x=f.encode(r);r=r.split(f.split);for(var t=0,A,z;t<x.length;t++){A=x[t];z=r[t];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);v=!0;break}}else{var F=A.indexOf(D);if(-1<F){q+=(q?" ":"")+z.substring(0,F)+g.replace("$1",z.substring(F,
 D.length))+z.substring(F+D.length);v=!0;break}}v||(q+=(q?" ":"")+r[t])}m[p].highlight=q}return a}function vb(a,b){for(var c=[],d=I(),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);else{if(c.length===b)return c;l.field=d[k]=[g.field];c.push(l)}}return c}function ub(a,b,c,d,e){a=this.tag.get(a);if(!a)return[];if((b=(a=a&&a.get(b))&&a.length-d)&&0<b){if(b>c||d)a=a.slice(d,d+c);e&&(a=X.call(this,a));return a}}
-function X(a){if(!this||!this.store)return a;for(var b=Array(a.length),c=0,d;c<a.length;c++)d=a[c],b[c]={id:d,doc:this.store.get(d)};return b};function W(a){if(!this||this.constructor!==W)return new W(a);var b=a.document||a.doc||a,c,d;this.J=[];this.field=[];this.S=[];this.key=(c=b.key||b.id)&&xb(c,this.S)||"id";(d=a.keystore||0)&&(this.keystore=d);this.reg=(this.fastupdate=!!a.fastupdate)?d?new U(d):new Map:d?new V(d):new Set;this.I=(c=b.store||null)&&c&&!0!==c&&[];this.store=c&&(d?new U(d):new Map);this.cache=(c=a.cache||null)&&new Z(c);a.cache=!1;this.worker=a.worker;this.index=yb.call(this,a,b);this.tag=null;if(c=b.tag)if("string"===
-typeof c&&(c=[c]),c.length){this.tag=new Map;this.L=[];this.aa=[];b=0;for(var e=d=void 0;b<c.length;b++){d=c[b];e=d.field||d;if(!e)throw Error("The tag field from the document descriptor is undefined.");d.custom?this.L[b]=d.custom:(this.L[b]=xb(e,this.S),d.filter&&("string"===typeof this.L[b]&&(this.L[b]=new String(this.L[b])),this.L[b].R=d.filter));this.aa[b]=e;this.tag.set(e,new Map)}}if(this.worker){a=[];c=w(this.index.values());for(b=c.next();!b.done;b=c.next())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()){l=l.value;var m=l[0];l[1].then&&g.index.set(m,f[h++])}return g})}}else a.db&&this.mount(a.db)}u=W.prototype;
+function X(a){if(!this||!this.store)return a;for(var b=Array(a.length),c=0,d;c<a.length;c++)d=a[c],b[c]={id:d,doc:this.store.get(d)};return b};function W(a){if(!this||this.constructor!==W)return new W(a);var b=a.document||a.doc||a,c,d;this.J=[];this.field=[];this.S=[];this.key=(c=b.key||b.id)&&xb(c,this.S)||"id";(d=a.keystore||0)&&(this.keystore=d);this.fastupdate=!!a.fastupdate;this.reg=!this.fastupdate||a.worker||a.db?d?new V(d):new Set:d?new U(d):new Map;this.I=(c=b.store||null)&&c&&!0!==c&&[];this.store=c&&(d?new U(d):new Map);this.cache=(c=a.cache||null)&&new Z(c);a.cache=!1;this.worker=a.worker;this.index=yb.call(this,a,b);this.tag=
+null;if(c=b.tag)if("string"===typeof c&&(c=[c]),c.length){this.tag=new Map;this.L=[];this.aa=[];b=0;for(var e=d=void 0;b<c.length;b++){d=c[b];e=d.field||d;if(!e)throw Error("The tag field from the document descriptor is undefined.");d.custom?this.L[b]=d.custom:(this.L[b]=xb(e,this.S),d.filter&&("string"===typeof this.L[b]&&(this.L[b]=new String(this.L[b])),this.L[b].R=d.filter));this.aa[b]=e;this.tag.set(e,new Map)}}if(this.worker){this.fastupdate=!1;a=[];c=w(this.index.values());for(b=c.next();!b.done;b=
+c.next())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()){l=l.value;var m=l[0];l[1].then&&g.index.set(m,f[h++])}return g})}}else a.db&&(this.fastupdate=!1,this.mount(a.db))}u=W.prototype;
 u.mount=function(a){var b=this.field;if(this.tag)for(var c=0,d;c<this.aa.length;c++){d=this.aa[c];var e;this.index.set(d,e=new R({},this.reg));b===this.field&&(b=b.slice(0));b.push(d);e.tag=this.tag.get(d)}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}this.db=!0;return Promise.all(c)};
 u.commit=function(a,b){var c=this,d,e,g,f;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));return E(h,Promise.all(d),2)}c.reg.clear();h.h=0})};u.destroy=function(){for(var a=[],b=w(this.index.values()),c=b.next();!c.done;c=b.next())a.push(c.value.destroy());return Promise.all(a)};
 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;if(this.worker){var h=new S(f);c.set(g,h)}this.worker||c.set(g,new R(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}if(this.I)for(a=b.store,K(a)&&(a=[a]),b=0;b<a.length;b++)d=a[b],e=d.field||d,d.custom?(this.I[b]=
@@ -108,9 +108,9 @@ 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
 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.G;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 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||"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;u.mount=function(a){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return a.mount(this)};
-u.commit=function(a,b){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return this.db.commit(this,a,b)};u.destroy=function(){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return this.db.destroy()};function Mb(a){a.commit_timer||(a.commit_timer=setTimeout(function(){a.commit_timer=null;a.db.commit(a,void 0,void 0)},0))}
+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||"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;
+u.mount=function(a){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return a.mount(this)};u.commit=function(a,b){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return this.db.commit(this,a,b)};u.destroy=function(){this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null);return this.db.destroy()};function Mb(a){a.commit_timer||(a.commit_timer=setTimeout(function(){a.commit_timer=null;a.db.commit(a,void 0,void 0)},0))}
 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)};
diff --git a/dist/flexsearch.light.debug.js b/dist/flexsearch.light.debug.js
index f90fba3..9b2891f 100644
--- a/dist/flexsearch.light.debug.js
+++ b/dist/flexsearch.light.debug.js
@@ -1,18 +1,18 @@
 /**!
- * FlexSearch.js v0.8.108 (Light/Debug)
+ * FlexSearch.js v0.8.109 (Light/Debug)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
  * https://github.com/nextapps-de/flexsearch
  */
 (function(self){'use strict';
-var t;
-function u(a, c, b) {
-  const d = typeof b, e = typeof a;
-  if ("undefined" !== d) {
-    if ("undefined" !== e) {
+var q;
+function r(a, c, b) {
+  const f = typeof b, d = typeof a;
+  if ("undefined" !== f) {
+    if ("undefined" !== d) {
       if (b) {
-        if ("function" === e && d === e) {
+        if ("function" === d && f === d) {
           return function(h) {
             return a(b(h));
           };
@@ -24,17 +24,17 @@ function u(a, c, b) {
           }
           if (c === Map) {
             var g = new Map(b);
-            for (var f of a) {
-              g.set(f[0], f[1]);
+            for (var e of a) {
+              g.set(e[0], e[1]);
             }
             return g;
           }
           if (c === Set) {
-            f = new Set(b);
+            e = new Set(b);
             for (g of a.values()) {
-              f.add(g);
+              e.add(g);
             }
-            return f;
+            return e;
           }
         }
       }
@@ -42,106 +42,99 @@ function u(a, c, b) {
     }
     return b;
   }
-  return "undefined" === e ? c : a;
+  return "undefined" === d ? c : a;
 }
 function w() {
   return Object.create(null);
 }
-function aa(a) {
-  let c = 0;
-  for (let b = 0, d; b < a.length; b++) {
-    (d = a[b]) && c < d.length && (c = d.length);
-  }
-  return c;
-}
-;const ba = /[^\p{L}\p{N}]+/u, ca = /(\d{3})/g, da = /(\D)(\d{3})/g, ea = /(\d{3})(\D)/g, x = "".normalize && /[\u0300-\u036f]/g;
-function y(a) {
-  if (!this || this.constructor !== y) {
-    return new y(...arguments);
+;const y = /[^\p{L}\p{N}]+/u, z = /(\d{3})/g, A = /(\D)(\d{3})/g, B = /(\d{3})(\D)/g, D = "".normalize && /[\u0300-\u036f]/g;
+function F(a) {
+  if (!this || this.constructor !== F) {
+    return new F(...arguments);
   }
   for (let c = 0; c < arguments.length; c++) {
     this.assign(arguments[c]);
   }
 }
-t = y.prototype;
-t.assign = function(a) {
-  this.normalize = u(a.normalize, !0, this.normalize);
-  let c = a.include, b = c || a.exclude || a.split, d;
+q = F.prototype;
+q.assign = function(a) {
+  this.normalize = r(a.normalize, !0, this.normalize);
+  let c = a.include, b = c || a.exclude || a.split, f;
   if (b || "" === b) {
     if ("object" === typeof b && b.constructor !== RegExp) {
-      let e = "";
-      d = !c;
-      c || (e += "\\p{Z}");
-      b.letter && (e += "\\p{L}");
-      b.number && (e += "\\p{N}", d = !!c);
-      b.symbol && (e += "\\p{S}");
-      b.punctuation && (e += "\\p{P}");
-      b.control && (e += "\\p{C}");
+      let d = "";
+      f = !c;
+      c || (d += "\\p{Z}");
+      b.letter && (d += "\\p{L}");
+      b.number && (d += "\\p{N}", f = !!c);
+      b.symbol && (d += "\\p{S}");
+      b.punctuation && (d += "\\p{P}");
+      b.control && (d += "\\p{C}");
       if (b = b.char) {
-        e += "object" === typeof b ? b.join("") : b;
+        d += "object" === typeof b ? b.join("") : b;
       }
       try {
-        this.split = new RegExp("[" + (c ? "^" : "") + e + "]+", "u");
+        this.split = new RegExp("[" + (c ? "^" : "") + d + "]+", "u");
       } catch (g) {
         console.error("Your split configuration:", b, "is not supported on this platform. It falls back to using simple whitespace splitter instead: /s+/."), this.split = /\s+/;
       }
     } else {
-      this.split = b, d = !1 === b || 2 > "a1a".split(b).length;
+      this.split = b, f = !1 === b || 2 > "a1a".split(b).length;
     }
-    this.numeric = u(a.numeric, d);
+    this.numeric = r(a.numeric, f);
   } else {
     try {
-      this.split = u(this.split, ba);
-    } catch (e) {
+      this.split = r(this.split, y);
+    } catch (d) {
       console.warn("This platform does not support unicode regex. It falls back to using simple whitespace splitter instead: /s+/."), this.split = /\s+/;
     }
-    this.numeric = u(a.numeric, u(this.numeric, !0));
+    this.numeric = r(a.numeric, r(this.numeric, !0));
   }
-  this.prepare = u(a.prepare, null, this.prepare);
-  this.finalize = u(a.finalize, null, this.finalize);
-  this.rtl = u(a.rtl, !1, this.rtl);
-  this.dedupe = u(a.dedupe, !1, this.dedupe);
-  this.filter = u((b = a.filter) && new Set(b), null, this.filter);
-  this.matcher = u((b = a.matcher) && new Map(b), null, this.matcher);
-  this.mapper = u((b = a.mapper) && new Map(b), null, this.mapper);
-  this.stemmer = u((b = a.stemmer) && new Map(b), null, this.stemmer);
-  this.replacer = u(a.replacer, null, this.replacer);
-  this.minlength = u(a.minlength, 1, this.minlength);
-  this.maxlength = u(a.maxlength, 0, this.maxlength);
-  if (this.cache = b = u(a.cache, !0, this.cache)) {
-    this.l = null, this.C = "number" === typeof b ? b : 2e5, this.i = new Map(), this.j = new Map(), this.s = this.o = 128;
+  this.prepare = r(a.prepare, null, this.prepare);
+  this.finalize = r(a.finalize, null, this.finalize);
+  this.rtl = r(a.rtl, !1, this.rtl);
+  this.dedupe = r(a.dedupe, !1, this.dedupe);
+  this.filter = r((b = a.filter) && new Set(b), null, this.filter);
+  this.matcher = r((b = a.matcher) && new Map(b), null, this.matcher);
+  this.mapper = r((b = a.mapper) && new Map(b), null, this.mapper);
+  this.stemmer = r((b = a.stemmer) && new Map(b), null, this.stemmer);
+  this.replacer = r(a.replacer, null, this.replacer);
+  this.minlength = r(a.minlength, 1, this.minlength);
+  this.maxlength = r(a.maxlength, 0, this.maxlength);
+  if (this.cache = b = r(a.cache, !0, this.cache)) {
+    this.l = null, this.A = "number" === typeof b ? b : 2e5, this.i = new Map(), this.j = new Map(), this.o = this.m = 128;
   }
   this.g = "";
-  this.v = null;
+  this.s = null;
   this.h = "";
-  this.A = null;
+  this.u = null;
   if (this.matcher) {
-    for (const e of this.matcher.keys()) {
-      this.g += (this.g ? "|" : "") + e;
+    for (const d of this.matcher.keys()) {
+      this.g += (this.g ? "|" : "") + d;
     }
   }
   if (this.stemmer) {
-    for (const e of this.stemmer.keys()) {
-      this.h += (this.h ? "|" : "") + e;
+    for (const d of this.stemmer.keys()) {
+      this.h += (this.h ? "|" : "") + d;
     }
   }
   return this;
 };
-t.addStemmer = function(a, c) {
+q.addStemmer = function(a, c) {
   this.stemmer || (this.stemmer = new Map());
   this.stemmer.set(a, c);
   this.h += (this.h ? "|" : "") + a;
-  this.A = null;
-  this.cache && z(this);
+  this.u = null;
+  this.cache && G(this);
   return this;
 };
-t.addFilter = function(a) {
+q.addFilter = function(a) {
   this.filter || (this.filter = new Set());
   this.filter.add(a);
-  this.cache && z(this);
+  this.cache && G(this);
   return this;
 };
-t.addMapper = function(a, c) {
+q.addMapper = function(a, c) {
   if ("object" === typeof a) {
     return this.addReplacer(a, c);
   }
@@ -150,10 +143,10 @@ t.addMapper = function(a, c) {
   }
   this.mapper || (this.mapper = new Map());
   this.mapper.set(a, c);
-  this.cache && z(this);
+  this.cache && G(this);
   return this;
 };
-t.addMatcher = function(a, c) {
+q.addMatcher = function(a, c) {
   if ("object" === typeof a) {
     return this.addReplacer(a, c);
   }
@@ -163,632 +156,185 @@ t.addMatcher = function(a, c) {
   this.matcher || (this.matcher = new Map());
   this.matcher.set(a, c);
   this.g += (this.g ? "|" : "") + a;
-  this.v = null;
-  this.cache && z(this);
+  this.s = null;
+  this.cache && G(this);
   return this;
 };
-t.addReplacer = function(a, c) {
+q.addReplacer = function(a, c) {
   if ("string" === typeof a) {
     return this.addMatcher(a, c);
   }
   this.replacer || (this.replacer = []);
   this.replacer.push(a, c);
-  this.cache && z(this);
+  this.cache && G(this);
   return this;
 };
-t.encode = function(a) {
-  if (this.cache && a.length <= this.o) {
+q.encode = function(a) {
+  if (this.cache && a.length <= this.m) {
     if (this.l) {
       if (this.i.has(a)) {
         return this.i.get(a);
       }
     } else {
-      this.l = setTimeout(z, 50, this);
+      this.l = setTimeout(G, 50, this);
     }
   }
-  this.normalize && ("function" === typeof this.normalize ? a = this.normalize(a) : a = x ? a.normalize("NFKD").replace(x, "").toLowerCase() : a.toLowerCase());
+  this.normalize && ("function" === typeof this.normalize ? a = this.normalize(a) : a = D ? a.normalize("NFKD").replace(D, "").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 "));
+  this.numeric && 3 < a.length && (a = a.replace(A, "$1 $2").replace(B, "$1 $2").replace(z, "$1 "));
   const c = !(this.dedupe || this.mapper || this.filter || this.matcher || this.stemmer || this.replacer);
-  let b = [], d = this.split || "" === this.split ? a.split(this.split) : a;
-  for (let g = 0, f, h; g < d.length; g++) {
-    if ((f = h = d[g]) && !(f.length < this.minlength)) {
+  let b = [], f = this.split || "" === this.split ? a.split(this.split) : a;
+  for (let g = 0, e, h; g < f.length; g++) {
+    if ((e = h = f[g]) && !(e.length < this.minlength)) {
       if (c) {
-        b.push(f);
+        b.push(e);
       } else {
-        if (!this.filter || !this.filter.has(f)) {
-          if (this.cache && f.length <= this.s) {
+        if (!this.filter || !this.filter.has(e)) {
+          if (this.cache && e.length <= this.o) {
             if (this.l) {
-              var e = this.j.get(f);
-              if (e || "" === e) {
-                e && b.push(e);
+              var d = this.j.get(e);
+              if (d || "" === d) {
+                d && b.push(d);
                 continue;
               }
             } else {
-              this.l = setTimeout(z, 50, this);
+              this.l = setTimeout(G, 50, this);
             }
           }
-          this.stemmer && 2 < f.length && (this.A || (this.A = new RegExp("(?!^)(" + this.h + ")$")), f = f.replace(this.A, k => this.stemmer.get(k)), f.length < this.minlength || this.filter && this.filter.has(f)) && (f = "");
-          if (f && (this.mapper || this.dedupe && 1 < f.length)) {
-            e = "";
-            for (let k = 0, l = "", n, m; k < f.length; k++) {
-              n = f.charAt(k), n === l && this.dedupe || ((m = this.mapper && this.mapper.get(n)) || "" === m ? m === l && this.dedupe || !(l = m) || (e += m) : e += l = n);
+          this.stemmer && 2 < e.length && (this.u || (this.u = new RegExp("(?!^)(" + this.h + ")$")), e = e.replace(this.u, k => this.stemmer.get(k)), e.length < this.minlength || this.filter && this.filter.has(e)) && (e = "");
+          if (e && (this.mapper || this.dedupe && 1 < e.length)) {
+            d = "";
+            for (let k = 0, n = "", m, u; k < e.length; k++) {
+              m = e.charAt(k), m === n && this.dedupe || ((u = this.mapper && this.mapper.get(m)) || "" === u ? u === n && this.dedupe || !(n = u) || (d += u) : d += n = m);
             }
-            f = e;
+            e = d;
           }
-          this.matcher && 1 < f.length && (this.v || (this.v = new RegExp("(" + this.g + ")", "g")), f = f.replace(this.v, k => this.matcher.get(k)));
-          if (f && this.replacer) {
-            for (e = 0; f && e < this.replacer.length; e += 2) {
-              f = f.replace(this.replacer[e], this.replacer[e + 1]);
+          this.matcher && 1 < e.length && (this.s || (this.s = new RegExp("(" + this.g + ")", "g")), e = e.replace(this.s, k => this.matcher.get(k)));
+          if (e && this.replacer) {
+            for (d = 0; e && d < this.replacer.length; d += 2) {
+              e = e.replace(this.replacer[d], this.replacer[d + 1]);
             }
           }
-          this.cache && h.length <= this.s && (this.j.set(h, f), this.j.size > this.C && (this.j.clear(), this.s = this.s / 1.1 | 0));
-          f && b.push(f);
+          this.cache && h.length <= this.o && (this.j.set(h, e), this.j.size > this.A && (this.j.clear(), this.o = this.o / 1.1 | 0));
+          e && b.push(e);
         }
       }
     }
   }
   this.finalize && (b = this.finalize(b) || b);
-  this.cache && a.length <= this.o && (this.i.set(a, b), this.i.size > this.C && (this.i.clear(), this.o = this.o / 1.1 | 0));
+  this.cache && a.length <= this.m && (this.i.set(a, b), this.i.size > this.A && (this.i.clear(), this.m = this.m / 1.1 | 0));
   return b;
 };
-function z(a) {
+function G(a) {
   a.l = null;
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-S.prototype.remove = function(a) {
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                 }
                 break;
               }
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-                  f = p[h] + f, k = this.score ? this.score(c, p, q, f, h) : T(r, d, q, e, h), U(this, n, f, k, a, b);
+              if (1 < d) {
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                 }
-                f = "";
+                e = "";
               }
             case "forward":
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-                for (h = 0; h < e; h++) {
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+              if (1 < d) {
+                for (h = 0; h < d; h++) {
+                  e += l[h], N(this, m, e, g, a, b);
                 }
                 break;
               }
             default:
-              if (U(this, n, p, g, a, b), m && 1 < d && q < d - 1) {
-                for (e = w(), f = this.B, g = p, h = Math.min(m + 1, d - q), e[g] = 1, k = 1; k < h; k++) {
-                  if ((p = c[this.rtl ? d - 1 - q - k : q + k]) && !e[p]) {
-                    e[p] = 1;
-                    const v = this.score ? this.score(c, g, q, p, k) : T(f + (d / 2 > f ? 0 : 1), d, q, h - 1, k - 1), B = this.bidirectional && p > g;
-                    U(this, l, B ? g : p, v, a, b, B ? p : g);
+              if (N(this, m, l, g, a, b), u && 1 < f && p < f - 1) {
+                for (d = w(), e = this.v, g = l, h = Math.min(u + 1, f - p), d[g] = 1, k = 1; k < h; k++) {
+                  if ((l = c[this.rtl ? f - 1 - p - k : p + k]) && !d[l]) {
+                    d[l] = 1;
+                    const v = this.score ? this.score(c, g, p, l, k) : M(e + (f / 2 > e ? 0 : 1), f, p, h - 1, k - 1), t = this.bidirectional && l > g;
+                    N(this, n, t ? g : l, v, a, b, t ? l : g);
                   }
                 }
               }
@@ -800,134 +346,182 @@ D.prototype.add = function(a, c, b, d) {
   }
   return this;
 };
-function U(a, c, b, d, e, g, f) {
-  let h = f ? a.ctx : a.map, k;
-  if (!c[b] || f && !(k = c[b])[f]) {
-    f ? (c = k || (c[b] = w()), c[f] = 1, (k = h.get(f)) ? h = k : h.set(f, h = new Map())) : c[b] = 1, (k = h.get(b)) ? h = k : h.set(b, h = []), h = h[d] || (h[d] = []), g && h.includes(e) || (h.push(e), a.fastupdate && ((c = a.reg.get(e)) ? c.push(h) : a.reg.set(e, [h])));
+function N(a, c, b, f, d, g, e) {
+  let h = e ? a.ctx : a.map, k;
+  if (!c[b] || e && !(k = c[b])[e]) {
+    e ? (c = k || (c[b] = w()), c[e] = 1, (k = h.get(e)) ? h = k : h.set(e, h = new Map())) : c[b] = 1, (k = h.get(b)) ? h = k : h.set(b, h = []), h = h[f] || (h[f] = []), g && h.includes(d) || (h.push(d), a.fastupdate && ((c = a.reg.get(d)) ? c.push(h) : a.reg.set(d, [h])));
   }
 }
-function T(a, c, b, d, e) {
-  return b && 1 < a ? c + (d || 0) <= a ? b + (e || 0) : (a - 1) / (c + (d || 0)) * (b + (e || 0)) + 1 | 0 : 0;
+function M(a, c, b, f, d) {
+  return b && 1 < a ? c + (f || 0) <= a ? b + (d || 0) : (a - 1) / (c + (f || 0)) * (b + (d || 0)) + 1 | 0 : 0;
 }
-;D.prototype.search = function(a, c, b) {
+;L.prototype.search = function(a, c, b) {
   b || (c || "object" !== typeof a ? "object" === typeof c && (b = c, c = 0) : (b = a, a = ""));
-  var d = [], e = 0;
+  var f = [], d = 0;
   if (b) {
     a = b.query || a;
     c = b.limit || c;
-    e = b.offset || 0;
+    d = b.offset || 0;
     var g = b.context;
-    var f = b.suggest;
+    var e = b.suggest;
     var h = !0;
     var k = b.resolution;
   } else {
     h = !0;
   }
-  b = this.encoder.encode(a);
-  a = b.length;
+  a = this.encoder.encode(a);
+  b = a.length;
   c = c || (h ? 100 : 0);
-  if (1 === a) {
-    return ua.call(this, b[0], "", c, e, h);
+  if (1 === b) {
+    return e = d, (d = O(this, a[0], "")) && d.length ? H.call(this, d, c, e) : [];
   }
   g = this.depth && !1 !== g;
-  if (2 === a && g && !f) {
-    return ua.call(this, b[0], b[1], c, e, h);
+  if (2 === b && g && !e) {
+    return e = d, (d = O(this, a[0], a[1])) && d.length ? H.call(this, d, c, e) : [];
   }
   h = w();
-  let l = 0;
-  if (1 < a && g) {
-    var n = b[0];
-    l = 1;
+  var n = 0;
+  if (1 < b && g) {
+    var m = a[0];
+    n = 1;
   }
-  k || 0 === k || (k = n ? this.B : this.resolution);
-  for (let p, v; l < a; l++) {
-    if ((v = b[l]) && !h[v]) {
+  k || 0 === k || (k = m ? this.v : this.resolution);
+  for (let l, v; n < b; n++) {
+    if ((v = a[n]) && !h[v]) {
       h[v] = 1;
-      p = va(this, v, n);
+      l = O(this, v, m);
       a: {
-        g = p;
-        var m = d, r = f, q = k;
-        let B = [];
+        g = l;
+        var u = f, C = e, p = k;
+        let t = [];
         if (g && g.length) {
-          if (g.length <= q) {
-            m.push(g);
-            p = void 0;
+          if (g.length <= p) {
+            u.push(g);
+            l = void 0;
             break a;
           }
-          for (let R = 0, ka; R < q; R++) {
-            if (ka = g[R]) {
-              B[R] = ka;
+          for (let x = 0, E; x < p; x++) {
+            if (E = g[x]) {
+              t[x] = E;
             }
           }
-          if (B.length) {
-            m.push(B);
-            p = void 0;
+          if (t.length) {
+            u.push(t);
+            l = void 0;
             break a;
           }
         }
-        p = r ? void 0 : B;
+        l = C ? void 0 : t;
       }
-      if (p) {
-        d = p;
+      if (l) {
+        f = l;
         break;
       }
-      n && (f && p && d.length || (n = v));
+      m && (e && l && f.length || (m = v));
     }
-    f && n && l === a - 1 && !d.length && (n = "", l = -1, h = w());
+    e && m && n === b - 1 && !f.length && (m = "", n = -1, h = w());
   }
   a: {
-    n = d.length;
-    a = d;
-    if (1 < n) {
-      a = ja(d, k, c, e, f);
-    } else if (1 === n) {
-      f = N.call(null, d[0], c, e);
+    a = f;
+    f = a.length;
+    m = a;
+    if (1 < f) {
+      b: {
+        f = e;
+        m = a.length;
+        e = [];
+        b = w();
+        for (let l = 0, v, t, x, E; l < k; l++) {
+          for (n = 0; n < m; n++) {
+            if (x = a[n], l < x.length && (v = x[l])) {
+              for (g = 0; g < v.length; g++) {
+                t = v[g], (h = b[t]) ? b[t]++ : (h = 0, b[t] = 1), E = e[h] || (e[h] = []), E.push(t);
+              }
+            }
+          }
+        }
+        if (a = e.length) {
+          if (f) {
+            if (1 < e.length) {
+              c: {
+                for (a = [], k = w(), f = e.length, h = f - 1; 0 <= h; h--) {
+                  if (b = (f = e[h]) && f.length) {
+                    for (n = 0; n < b; n++) {
+                      if (m = f[n], !k[m]) {
+                        if (k[m] = 1, d) {
+                          d--;
+                        } else {
+                          if (a.push(m), a.length === c) {
+                            break c;
+                          }
+                        }
+                      }
+                    }
+                  }
+                }
+              }
+            } else {
+              a = (e = e[0]).length > c || d ? e.slice(d, c + d) : e;
+            }
+            e = a;
+          } else {
+            if (a < m) {
+              m = [];
+              break b;
+            }
+            e = e[a - 1];
+            if (c || d) {
+              if (e.length > c || d) {
+                e = e.slice(d, c + d);
+              }
+            }
+          }
+        }
+        m = e;
+      }
+    } else if (1 === f) {
+      c = H.call(null, a[0], c, d);
       break a;
     }
-    f = a;
+    c = m;
   }
-  return f;
+  return c;
 };
-function ua(a, c, b, d, e) {
-  a = va(this, a, c);
-  e = !0;
-  return a && a.length ? e ? N.call(this, a, b, d) : new Q(a) : e ? [] : new Q();
-}
-function va(a, c, b) {
-  let d;
-  b && (d = a.bidirectional && c > b) && (d = b, b = c, c = d);
+function O(a, c, b) {
+  let f;
+  b && (f = a.bidirectional && c > b) && (f = b, b = c, c = f);
   a = b ? (a = a.ctx.get(b)) && a.get(c) : a.map.get(c);
   return a;
 }
-;D.prototype.remove = function(a, c) {
+;L.prototype.remove = function(a, c) {
   const b = this.reg.size && (this.fastupdate ? this.reg.get(a) : this.reg.has(a));
   if (b) {
     if (this.fastupdate) {
-      for (let d = 0, e; d < b.length; d++) {
-        if (e = b[d]) {
-          if (2 > e.length) {
-            e.pop();
+      for (let f = 0, d; f < b.length; f++) {
+        if (d = b[f]) {
+          if (2 > d.length) {
+            d.pop();
           } else {
-            const g = e.indexOf(a);
-            g === b.length - 1 ? e.pop() : e.splice(g, 1);
+            const g = d.indexOf(a);
+            g === b.length - 1 ? d.pop() : d.splice(g, 1);
           }
         }
       }
     } else {
-      V(this.map, a), this.depth && V(this.ctx, a);
+      P(this.map, a), this.depth && P(this.ctx, a);
     }
     c || this.reg.delete(a);
   }
   this.cache && this.cache.remove(a);
   return this;
 };
-function V(a, c) {
+function P(a, c) {
   let b = 0;
   if (a.constructor === Array) {
-    for (let d = 0, e, g; d < a.length; d++) {
-      if ((e = a[d]) && e.length) {
-        if (g = e.indexOf(c), 0 <= g) {
-          1 < e.length ? (e.splice(g, 1), b++) : delete a[d];
+    for (let f = 0, d, g; f < a.length; f++) {
+      if ((d = a[f]) && d.length) {
+        if (g = d.indexOf(c), 0 <= g) {
+          1 < d.length ? (d.splice(g, 1), b++) : delete a[f];
           break;
         } else {
           b++;
@@ -935,100 +529,100 @@ function V(a, c) {
       }
     }
   } else {
-    for (let d of a.entries()) {
-      const e = d[0], g = V(d[1], c);
-      g ? b += g : a.delete(e);
+    for (let f of a.entries()) {
+      const d = f[0], g = P(f[1], c);
+      g ? b += g : a.delete(d);
     }
   }
   return b;
 }
-;function D(a, c) {
-  if (!this || this.constructor !== D) {
-    return new D(a);
+;function L(a, c) {
+  if (!this || this.constructor !== L) {
+    return new L(a);
   }
   if (a) {
     var b = "string" === typeof a ? a : a.preset;
-    b && (ta[b] || console.warn("Preset not found: " + b), a = Object.assign({}, ta[b], a));
+    b && (K[b] || console.warn("Preset not found: " + b), a = Object.assign({}, K[b], a));
   } else {
     a = {};
   }
   b = a.context;
-  const d = !0 === b ? {depth:1} : b || {}, e = a.encode || a.encoder || sa;
-  this.encoder = e.encode ? e : "object" === typeof e ? new y(e) : {encode:e};
+  const f = !0 === b ? {depth:1} : b || {}, d = a.encode || a.encoder || J;
+  this.encoder = d.encode ? d : "object" === typeof d ? new F(d) : {encode:d};
   this.resolution = a.resolution || 9;
-  this.tokenize = b = a.tokenize || "strict";
-  this.depth = "strict" === b && d.depth || 0;
-  this.bidirectional = !1 !== d.bidirectional;
+  this.tokenize = (b = a.tokenize) && "default" !== b || "strict";
+  this.depth = "strict" === b && f.depth || 0;
+  this.bidirectional = !1 !== f.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.B = d.resolution || 3;
-  this.rtl = e.rtl || a.rtl || !1;
-  this.cache = (b = a.cache || null) && new S(b);
+  this.v = f.resolution || 3;
+  this.rtl = d.rtl || a.rtl || !1;
+  this.cache = (b = a.cache || null) && new I(b);
 }
-t = D.prototype;
-t.clear = function() {
+q = L.prototype;
+q.clear = function() {
   this.map.clear();
   this.ctx.clear();
   this.reg.clear();
   this.cache && this.cache.clear();
   return this;
 };
-t.append = function(a, c) {
+q.append = function(a, c) {
   return this.add(a, c, !0);
 };
-t.contain = function(a) {
+q.contain = function(a) {
   return this.reg.has(a);
 };
-t.update = function(a, c) {
-  const b = this, d = this.remove(a);
-  return d && d.then ? d.then(() => b.add(a, c)) : this.add(a, c);
+q.update = function(a, c) {
+  const b = this, f = this.remove(a);
+  return f && f.then ? f.then(() => b.add(a, c)) : this.add(a, c);
 };
-function W(a) {
+function Q(a) {
   let c = 0;
   if (a.constructor === Array) {
-    for (let b = 0, d; b < a.length; b++) {
-      (d = a[b]) && (c += d.length);
+    for (let b = 0, f; b < a.length; b++) {
+      (f = a[b]) && (c += f.length);
     }
   } else {
     for (const b of a) {
-      const d = b[0], e = W(b[1]);
-      e ? c += e : a.delete(d);
+      const f = b[0], d = Q(b[1]);
+      d ? c += d : a.delete(f);
     }
   }
   return c;
 }
-t.cleanup = function() {
+q.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
-  W(this.map);
-  this.depth && W(this.ctx);
+  Q(this.map);
+  this.depth && Q(this.ctx);
   return this;
 };
-t.searchCache = function(a, c, b) {
+q.searchCache = function(a, c, b) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
-  this.cache || (this.cache = new S());
-  let d = this.cache.get(a);
-  if (!d) {
-    d = this.search(a, c, b);
-    if (d.then) {
-      const e = this;
-      d.then(function(g) {
-        e.cache.set(a, g);
+  this.cache || (this.cache = new I());
+  let f = this.cache.get(a);
+  if (!f) {
+    f = this.search(a, c, b);
+    if (f.then) {
+      const d = this;
+      f.then(function(g) {
+        d.cache.set(a, g);
         return g;
       });
     }
-    this.cache.set(a, d);
+    this.cache.set(a, f);
   }
-  return d;
+  return f;
 };
-const X = {Index:D, Charset:null, Encoder:y, Document:null, Worker:null, Resolver:null, IndexedDB:null, Language:{}}, Y = "undefined" !== typeof self ? self : "undefined" !== typeof global ? global : "undefined" !== typeof window ? window : {};
-let Z;
-(Z = Y.define) && Z.amd ? Z([], function() {
-  return X;
-}) : "object" === typeof Y.exports ? Y.exports = X : Y.FlexSearch = X;
+const R = {Index:L, Charset:null, Encoder:F, Document:null, Worker:null, Resolver:null, IndexedDB:null, Language:{}}, S = "undefined" !== typeof self ? self : "undefined" !== typeof global ? global : "undefined" !== typeof window ? window : {};
+let T;
+(T = S.define) && T.amd ? T([], function() {
+  return R;
+}) : "object" === typeof S.exports ? S.exports = R : S.FlexSearch = R;
 }(this||self));
diff --git a/dist/flexsearch.light.min.js b/dist/flexsearch.light.min.js
index 03dee1f..b2b00e5 100644
--- a/dist/flexsearch.light.min.js
+++ b/dist/flexsearch.light.min.js
@@ -1,40 +1,27 @@
 /**!
- * FlexSearch.js v0.8.108 (Light)
+ * FlexSearch.js v0.8.109 (Light)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
  * https://github.com/nextapps-de/flexsearch
  */
-(function(self){'use strict';var t;function u(a,c,b){const d=typeof b,e=typeof a;if("undefined"!==d){if("undefined"!==e){if(b){if("function"===e&&d===e)return function(h){return a(b(h))};c=a.constructor;if(c===b.constructor){if(c===Array)return b.concat(a);if(c===Map){var g=new Map(b);for(var f of a)g.set(f[0],f[1]);return g}if(c===Set){f=new Set(b);for(g of a.values())f.add(g);return f}}}return a}return b}return"undefined"===e?c:a}function w(){return Object.create(null)}
-function aa(a){let c=0;for(let b=0,d;b<a.length;b++)(d=a[b])&&c<d.length&&(c=d.length);return c};const ba=/[^\p{L}\p{N}]+/u,ca=/(\d{3})/g,da=/(\D)(\d{3})/g,ea=/(\d{3})(\D)/g,x="".normalize&&/[\u0300-\u036f]/g;function y(a){if(!this||this.constructor!==y)return new y(...arguments);for(let c=0;c<arguments.length;c++)this.assign(arguments[c])}t=y.prototype;
-t.assign=function(a){this.normalize=u(a.normalize,!0,this.normalize);let c=a.include,b=c||a.exclude||a.split,d;if(b||""===b){if("object"===typeof b&&b.constructor!==RegExp){let e="";d=!c;c||(e+="\\p{Z}");b.letter&&(e+="\\p{L}");b.number&&(e+="\\p{N}",d=!!c);b.symbol&&(e+="\\p{S}");b.punctuation&&(e+="\\p{P}");b.control&&(e+="\\p{C}");if(b=b.char)e+="object"===typeof b?b.join(""):b;try{this.split=new RegExp("["+(c?"^":"")+e+"]+","u")}catch(g){this.split=/\s+/}}else this.split=b,d=!1===b||2>"a1a".split(b).length;
-this.numeric=u(a.numeric,d)}else{try{this.split=u(this.split,ba)}catch(e){this.split=/\s+/}this.numeric=u(a.numeric,u(this.numeric,!0))}this.prepare=u(a.prepare,null,this.prepare);this.finalize=u(a.finalize,null,this.finalize);this.rtl=u(a.rtl,!1,this.rtl);this.dedupe=u(a.dedupe,!1,this.dedupe);this.filter=u((b=a.filter)&&new Set(b),null,this.filter);this.matcher=u((b=a.matcher)&&new Map(b),null,this.matcher);this.mapper=u((b=a.mapper)&&new Map(b),null,this.mapper);this.stemmer=u((b=a.stemmer)&&new Map(b),
-null,this.stemmer);this.replacer=u(a.replacer,null,this.replacer);this.minlength=u(a.minlength,1,this.minlength);this.maxlength=u(a.maxlength,0,this.maxlength);if(this.cache=b=u(a.cache,!0,this.cache))this.l=null,this.C="number"===typeof b?b:2E5,this.i=new Map,this.j=new Map,this.s=this.o=128;this.g="";this.v=null;this.h="";this.A=null;if(this.matcher)for(const e of this.matcher.keys())this.g+=(this.g?"|":"")+e;if(this.stemmer)for(const e of this.stemmer.keys())this.h+=(this.h?"|":"")+e;return this};
-t.addStemmer=function(a,c){this.stemmer||(this.stemmer=new Map);this.stemmer.set(a,c);this.h+=(this.h?"|":"")+a;this.A=null;this.cache&&z(this);return this};t.addFilter=function(a){this.filter||(this.filter=new Set);this.filter.add(a);this.cache&&z(this);return this};t.addMapper=function(a,c){if("object"===typeof a)return this.addReplacer(a,c);if(1<a.length)return this.addMatcher(a,c);this.mapper||(this.mapper=new Map);this.mapper.set(a,c);this.cache&&z(this);return this};
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+q.addStemmer=function(a,c){this.stemmer||(this.stemmer=new Map);this.stemmer.set(a,c);this.h+=(this.h?"|":"")+a;this.u=null;this.cache&&G(this);return this};q.addFilter=function(a){this.filter||(this.filter=new Set);this.filter.add(a);this.cache&&G(this);return this};q.addMapper=function(a,c){if("object"===typeof a)return this.addReplacer(a,c);if(1<a.length)return this.addMatcher(a,c);this.mapper||(this.mapper=new Map);this.mapper.set(a,c);this.cache&&G(this);return this};
+q.addMatcher=function(a,c){if("object"===typeof a)return this.addReplacer(a,c);if(2>a.length&&(this.dedupe||this.mapper))return this.addMapper(a,c);this.matcher||(this.matcher=new Map);this.matcher.set(a,c);this.g+=(this.g?"|":"")+a;this.s=null;this.cache&&G(this);return this};q.addReplacer=function(a,c){if("string"===typeof a)return this.addMatcher(a,c);this.replacer||(this.replacer=[]);this.replacer.push(a,c);this.cache&&G(this);return this};
+q.encode=function(a){if(this.cache&&a.length<=this.m)if(this.l){if(this.i.has(a))return this.i.get(a)}else this.l=setTimeout(G,50,this);this.normalize&&("function"===typeof this.normalize?a=this.normalize(a):a=D?a.normalize("NFKD").replace(D,"").toLowerCase():a.toLowerCase());this.prepare&&(a=this.prepare(a));this.numeric&&3<a.length&&(a=a.replace(A,"$1 $2").replace(B,"$1 $2").replace(z,"$1 "));const c=!(this.dedupe||this.mapper||this.filter||this.matcher||this.stemmer||this.replacer);let b=[],f=
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+if(e&&(this.mapper||this.dedupe&&1<e.length)){d="";for(let k=0,n="",m,u;k<e.length;k++)m=e.charAt(k),m===n&&this.dedupe||((u=this.mapper&&this.mapper.get(m))||""===u?u===n&&this.dedupe||!(n=u)||(d+=u):d+=n=m);e=d}this.matcher&&1<e.length&&(this.s||(this.s=new RegExp("("+this.g+")","g")),e=e.replace(this.s,k=>this.matcher.get(k)));if(e&&this.replacer)for(d=0;e&&d<this.replacer.length;d+=2)e=e.replace(this.replacer[d],this.replacer[d+1]);this.cache&&h.length<=this.o&&(this.j.set(h,e),this.j.size>this.A&&
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+I.prototype.clear=function(){this.cache.clear();this.g=""};const J={normalize:function(a){return a.toLowerCase()}};const K={memory:{resolution:1},performance:{resolution:6,fastupdate:!0,context:{depth:1,resolution:3}},match:{tokenize:"forward"},score:{resolution:9,context:{depth:2,resolution:9}}};L.prototype.add=function(a,c,b,f){if(c&&(a||0===a)){if(!f&&!b&&this.reg.has(a))return this.update(a,c);c=this.encoder.encode(c);if(f=c.length){const n=w(),m=w(),u=this.depth,C=this.resolution;for(let p=0;p<f;p++){let l=c[this.rtl?f-1-p:p];var d=l.length;if(d&&(u||!m[l])){var g=this.score?this.score(c,l,p,null,0):M(C,f,p),e="";switch(this.tokenize){case "full":if(2<d){for(g=0;g<d;g++)for(var h=d;h>g;h--){e=l.substring(g,h);var k=this.score?this.score(c,l,p,e,g):M(C,f,p,d,g);N(this,m,e,k,a,b)}break}case "reverse":if(1<
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+function N(a,c,b,f,d,g,e){let h=e?a.ctx:a.map,k;if(!c[b]||e&&!(k=c[b])[e])e?(c=k||(c[b]=w()),c[e]=1,(k=h.get(e))?h=k:h.set(e,h=new Map)):c[b]=1,(k=h.get(b))?h=k:h.set(b,h=[]),h=h[f]||(h[f]=[]),g&&h.includes(d)||(h.push(d),a.fastupdate&&((c=a.reg.get(d))?c.push(h):a.reg.set(d,[h])))}function M(a,c,b,f,d){return b&&1<a?c+(f||0)<=a?b+(d||0):(a-1)/(c+(f||0))*(b+(d||0))+1|0:0};L.prototype.search=function(a,c,b){b||(c||"object"!==typeof a?"object"===typeof c&&(b=c,c=0):(b=a,a=""));var f=[],d=0;if(b){a=b.query||a;c=b.limit||c;d=b.offset||0;var g=b.context;var e=b.suggest;var h=!0;var k=b.resolution}else h=!0;a=this.encoder.encode(a);b=a.length;c=c||(h?100:0);if(1===b)return e=d,(d=O(this,a[0],""))&&d.length?H.call(this,d,c,e):[];g=this.depth&&!1!==g;if(2===b&&g&&!e)return e=d,(d=O(this,a[0],a[1]))&&d.length?H.call(this,d,c,e):[];h=w();var n=0;if(1<b&&g){var m=a[0];n=1}k||
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+function O(a,c,b){let f;b&&(f=a.bidirectional&&c>b)&&(f=b,b=c,c=f);a=b?(a=a.ctx.get(b))&&a.get(c):a.map.get(c);return a};L.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 f=0,d;f<b.length;f++){if(d=b[f])if(2>d.length)d.pop();else{const g=d.indexOf(a);g===b.length-1?d.pop():d.splice(g,1)}}else P(this.map,a),this.depth&&P(this.ctx,a);c||this.reg.delete(a)}this.cache&&this.cache.remove(a);return this};
+function P(a,c){let b=0;if(a.constructor===Array)for(let f=0,d,g;f<a.length;f++){if((d=a[f])&&d.length)if(g=d.indexOf(c),0<=g){1<d.length?(d.splice(g,1),b++):delete a[f];break}else b++}else for(let f of a.entries()){const d=f[0],g=P(f[1],c);g?b+=g:a.delete(d)}return b};function L(a,c){if(!this||this.constructor!==L)return new L(a);if(a){var b="string"===typeof a?a:a.preset;b&&(a=Object.assign({},K[b],a))}else a={};b=a.context;const f=!0===b?{depth:1}:b||{},d=a.encode||a.encoder||J;this.encoder=d.encode?d:"object"===typeof d?new F(d):{encode:d};this.resolution=a.resolution||9;this.tokenize=(b=a.tokenize)&&"default"!==b||"strict";this.depth="strict"===b&&f.depth||0;this.bidirectional=!1!==f.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.v=f.resolution||3;this.rtl=d.rtl||a.rtl||!1;this.cache=(b=a.cache||null)&&new I(b)}q=L.prototype;q.clear=function(){this.map.clear();this.ctx.clear();this.reg.clear();this.cache&&this.cache.clear();return this};q.append=function(a,c){return this.add(a,c,!0)};q.contain=function(a){return this.reg.has(a)};q.update=function(a,c){const b=this,f=this.remove(a);return f&&f.then?f.then(()=>b.add(a,c)):this.add(a,c)};
+function Q(a){let c=0;if(a.constructor===Array)for(let b=0,f;b<a.length;b++)(f=a[b])&&(c+=f.length);else for(const b of a){const f=b[0],d=Q(b[1]);d?c+=d:a.delete(f)}return c}q.cleanup=function(){if(!this.fastupdate)return this;Q(this.map);this.depth&&Q(this.ctx);return this};
+q.searchCache=function(a,c,b){a=("object"===typeof a?""+a.query:a).toLowerCase();this.cache||(this.cache=new I);let f=this.cache.get(a);if(!f){f=this.search(a,c,b);if(f.then){const d=this;f.then(function(g){d.cache.set(a,g);return g})}this.cache.set(a,f)}return f};const R={Index:L,Charset:null,Encoder:F,Document:null,Worker:null,Resolver:null,IndexedDB:null,Language:{}},S="undefined"!==typeof self?self:"undefined"!==typeof global?global:"undefined"!==typeof window?window:{};let T;(T=S.define)&&T.amd?T([],function(){return R}):"object"===typeof S.exports?S.exports=R:S.FlexSearch=R;}(this||self));
diff --git a/dist/flexsearch.light.module.debug.js b/dist/flexsearch.light.module.debug.js
index 259b656..90a0fac 100644
--- a/dist/flexsearch.light.module.debug.js
+++ b/dist/flexsearch.light.module.debug.js
@@ -1,17 +1,17 @@
 /**!
- * FlexSearch.js v0.8.108 (Bundle/Debug)
+ * FlexSearch.js v0.8.109 (Bundle/Debug)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
  * https://github.com/nextapps-de/flexsearch
  */
-var t;
-function u(a, c, b) {
-  const d = typeof b, e = typeof a;
-  if ("undefined" !== d) {
-    if ("undefined" !== e) {
+var q;
+function r(a, c, b) {
+  const f = typeof b, d = typeof a;
+  if ("undefined" !== f) {
+    if ("undefined" !== d) {
       if (b) {
-        if ("function" === e && d === e) {
+        if ("function" === d && f === d) {
           return function(h) {
             return a(b(h));
           };
@@ -23,17 +23,17 @@ function u(a, c, b) {
           }
           if (c === Map) {
             var g = new Map(b);
-            for (var f of a) {
-              g.set(f[0], f[1]);
+            for (var e of a) {
+              g.set(e[0], e[1]);
             }
             return g;
           }
           if (c === Set) {
-            f = new Set(b);
+            e = new Set(b);
             for (g of a.values()) {
-              f.add(g);
+              e.add(g);
             }
-            return f;
+            return e;
           }
         }
       }
@@ -41,106 +41,99 @@ function u(a, c, b) {
     }
     return b;
   }
-  return "undefined" === e ? c : a;
+  return "undefined" === d ? c : a;
 }
 function w() {
   return Object.create(null);
 }
-function aa(a) {
-  let c = 0;
-  for (let b = 0, d; b < a.length; b++) {
-    (d = a[b]) && c < d.length && (c = d.length);
-  }
-  return c;
-}
-;const ba = /[^\p{L}\p{N}]+/u, ca = /(\d{3})/g, da = /(\D)(\d{3})/g, ea = /(\d{3})(\D)/g, x = "".normalize && /[\u0300-\u036f]/g;
-function y(a) {
-  if (!this || this.constructor !== y) {
-    return new y(...arguments);
+;const y = /[^\p{L}\p{N}]+/u, z = /(\d{3})/g, A = /(\D)(\d{3})/g, B = /(\d{3})(\D)/g, D = "".normalize && /[\u0300-\u036f]/g;
+function F(a) {
+  if (!this || this.constructor !== F) {
+    return new F(...arguments);
   }
   for (let c = 0; c < arguments.length; c++) {
     this.assign(arguments[c]);
   }
 }
-t = y.prototype;
-t.assign = function(a) {
-  this.normalize = u(a.normalize, !0, this.normalize);
-  let c = a.include, b = c || a.exclude || a.split, d;
+q = F.prototype;
+q.assign = function(a) {
+  this.normalize = r(a.normalize, !0, this.normalize);
+  let c = a.include, b = c || a.exclude || a.split, f;
   if (b || "" === b) {
     if ("object" === typeof b && b.constructor !== RegExp) {
-      let e = "";
-      d = !c;
-      c || (e += "\\p{Z}");
-      b.letter && (e += "\\p{L}");
-      b.number && (e += "\\p{N}", d = !!c);
-      b.symbol && (e += "\\p{S}");
-      b.punctuation && (e += "\\p{P}");
-      b.control && (e += "\\p{C}");
+      let d = "";
+      f = !c;
+      c || (d += "\\p{Z}");
+      b.letter && (d += "\\p{L}");
+      b.number && (d += "\\p{N}", f = !!c);
+      b.symbol && (d += "\\p{S}");
+      b.punctuation && (d += "\\p{P}");
+      b.control && (d += "\\p{C}");
       if (b = b.char) {
-        e += "object" === typeof b ? b.join("") : b;
+        d += "object" === typeof b ? b.join("") : b;
       }
       try {
-        this.split = new RegExp("[" + (c ? "^" : "") + e + "]+", "u");
+        this.split = new RegExp("[" + (c ? "^" : "") + d + "]+", "u");
       } catch (g) {
         console.error("Your split configuration:", b, "is not supported on this platform. It falls back to using simple whitespace splitter instead: /s+/."), this.split = /\s+/;
       }
     } else {
-      this.split = b, d = !1 === b || 2 > "a1a".split(b).length;
+      this.split = b, f = !1 === b || 2 > "a1a".split(b).length;
     }
-    this.numeric = u(a.numeric, d);
+    this.numeric = r(a.numeric, f);
   } else {
     try {
-      this.split = u(this.split, ba);
-    } catch (e) {
+      this.split = r(this.split, y);
+    } catch (d) {
       console.warn("This platform does not support unicode regex. It falls back to using simple whitespace splitter instead: /s+/."), this.split = /\s+/;
     }
-    this.numeric = u(a.numeric, u(this.numeric, !0));
+    this.numeric = r(a.numeric, r(this.numeric, !0));
   }
-  this.prepare = u(a.prepare, null, this.prepare);
-  this.finalize = u(a.finalize, null, this.finalize);
-  this.rtl = u(a.rtl, !1, this.rtl);
-  this.dedupe = u(a.dedupe, !1, this.dedupe);
-  this.filter = u((b = a.filter) && new Set(b), null, this.filter);
-  this.matcher = u((b = a.matcher) && new Map(b), null, this.matcher);
-  this.mapper = u((b = a.mapper) && new Map(b), null, this.mapper);
-  this.stemmer = u((b = a.stemmer) && new Map(b), null, this.stemmer);
-  this.replacer = u(a.replacer, null, this.replacer);
-  this.minlength = u(a.minlength, 1, this.minlength);
-  this.maxlength = u(a.maxlength, 0, this.maxlength);
-  if (this.cache = b = u(a.cache, !0, this.cache)) {
-    this.l = null, this.C = "number" === typeof b ? b : 2e5, this.i = new Map(), this.j = new Map(), this.s = this.o = 128;
+  this.prepare = r(a.prepare, null, this.prepare);
+  this.finalize = r(a.finalize, null, this.finalize);
+  this.rtl = r(a.rtl, !1, this.rtl);
+  this.dedupe = r(a.dedupe, !1, this.dedupe);
+  this.filter = r((b = a.filter) && new Set(b), null, this.filter);
+  this.matcher = r((b = a.matcher) && new Map(b), null, this.matcher);
+  this.mapper = r((b = a.mapper) && new Map(b), null, this.mapper);
+  this.stemmer = r((b = a.stemmer) && new Map(b), null, this.stemmer);
+  this.replacer = r(a.replacer, null, this.replacer);
+  this.minlength = r(a.minlength, 1, this.minlength);
+  this.maxlength = r(a.maxlength, 0, this.maxlength);
+  if (this.cache = b = r(a.cache, !0, this.cache)) {
+    this.l = null, this.A = "number" === typeof b ? b : 2e5, this.i = new Map(), this.j = new Map(), this.o = this.m = 128;
   }
   this.g = "";
-  this.v = null;
+  this.s = null;
   this.h = "";
-  this.A = null;
+  this.u = null;
   if (this.matcher) {
-    for (const e of this.matcher.keys()) {
-      this.g += (this.g ? "|" : "") + e;
+    for (const d of this.matcher.keys()) {
+      this.g += (this.g ? "|" : "") + d;
     }
   }
   if (this.stemmer) {
-    for (const e of this.stemmer.keys()) {
-      this.h += (this.h ? "|" : "") + e;
+    for (const d of this.stemmer.keys()) {
+      this.h += (this.h ? "|" : "") + d;
     }
   }
   return this;
 };
-t.addStemmer = function(a, c) {
+q.addStemmer = function(a, c) {
   this.stemmer || (this.stemmer = new Map());
   this.stemmer.set(a, c);
   this.h += (this.h ? "|" : "") + a;
-  this.A = null;
-  this.cache && z(this);
+  this.u = null;
+  this.cache && G(this);
   return this;
 };
-t.addFilter = function(a) {
+q.addFilter = function(a) {
   this.filter || (this.filter = new Set());
   this.filter.add(a);
-  this.cache && z(this);
+  this.cache && G(this);
   return this;
 };
-t.addMapper = function(a, c) {
+q.addMapper = function(a, c) {
   if ("object" === typeof a) {
     return this.addReplacer(a, c);
   }
@@ -149,10 +142,10 @@ t.addMapper = function(a, c) {
   }
   this.mapper || (this.mapper = new Map());
   this.mapper.set(a, c);
-  this.cache && z(this);
+  this.cache && G(this);
   return this;
 };
-t.addMatcher = function(a, c) {
+q.addMatcher = function(a, c) {
   if ("object" === typeof a) {
     return this.addReplacer(a, c);
   }
@@ -162,632 +155,185 @@ t.addMatcher = function(a, c) {
   this.matcher || (this.matcher = new Map());
   this.matcher.set(a, c);
   this.g += (this.g ? "|" : "") + a;
-  this.v = null;
-  this.cache && z(this);
+  this.s = null;
+  this.cache && G(this);
   return this;
 };
-t.addReplacer = function(a, c) {
+q.addReplacer = function(a, c) {
   if ("string" === typeof a) {
     return this.addMatcher(a, c);
   }
   this.replacer || (this.replacer = []);
   this.replacer.push(a, c);
-  this.cache && z(this);
+  this.cache && G(this);
   return this;
 };
-t.encode = function(a) {
-  if (this.cache && a.length <= this.o) {
+q.encode = function(a) {
+  if (this.cache && a.length <= this.m) {
     if (this.l) {
       if (this.i.has(a)) {
         return this.i.get(a);
       }
     } else {
-      this.l = setTimeout(z, 50, this);
+      this.l = setTimeout(G, 50, this);
     }
   }
-  this.normalize && ("function" === typeof this.normalize ? a = this.normalize(a) : a = x ? a.normalize("NFKD").replace(x, "").toLowerCase() : a.toLowerCase());
+  this.normalize && ("function" === typeof this.normalize ? a = this.normalize(a) : a = D ? a.normalize("NFKD").replace(D, "").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 "));
+  this.numeric && 3 < a.length && (a = a.replace(A, "$1 $2").replace(B, "$1 $2").replace(z, "$1 "));
   const c = !(this.dedupe || this.mapper || this.filter || this.matcher || this.stemmer || this.replacer);
-  let b = [], d = this.split || "" === this.split ? a.split(this.split) : a;
-  for (let g = 0, f, h; g < d.length; g++) {
-    if ((f = h = d[g]) && !(f.length < this.minlength)) {
+  let b = [], f = this.split || "" === this.split ? a.split(this.split) : a;
+  for (let g = 0, e, h; g < f.length; g++) {
+    if ((e = h = f[g]) && !(e.length < this.minlength)) {
       if (c) {
-        b.push(f);
+        b.push(e);
       } else {
-        if (!this.filter || !this.filter.has(f)) {
-          if (this.cache && f.length <= this.s) {
+        if (!this.filter || !this.filter.has(e)) {
+          if (this.cache && e.length <= this.o) {
             if (this.l) {
-              var e = this.j.get(f);
-              if (e || "" === e) {
-                e && b.push(e);
+              var d = this.j.get(e);
+              if (d || "" === d) {
+                d && b.push(d);
                 continue;
               }
             } else {
-              this.l = setTimeout(z, 50, this);
+              this.l = setTimeout(G, 50, this);
             }
           }
-          this.stemmer && 2 < f.length && (this.A || (this.A = new RegExp("(?!^)(" + this.h + ")$")), f = f.replace(this.A, k => this.stemmer.get(k)), f.length < this.minlength || this.filter && this.filter.has(f)) && (f = "");
-          if (f && (this.mapper || this.dedupe && 1 < f.length)) {
-            e = "";
-            for (let k = 0, l = "", n, m; k < f.length; k++) {
-              n = f.charAt(k), n === l && this.dedupe || ((m = this.mapper && this.mapper.get(n)) || "" === m ? m === l && this.dedupe || !(l = m) || (e += m) : e += l = n);
+          this.stemmer && 2 < e.length && (this.u || (this.u = new RegExp("(?!^)(" + this.h + ")$")), e = e.replace(this.u, k => this.stemmer.get(k)), e.length < this.minlength || this.filter && this.filter.has(e)) && (e = "");
+          if (e && (this.mapper || this.dedupe && 1 < e.length)) {
+            d = "";
+            for (let k = 0, n = "", m, u; k < e.length; k++) {
+              m = e.charAt(k), m === n && this.dedupe || ((u = this.mapper && this.mapper.get(m)) || "" === u ? u === n && this.dedupe || !(n = u) || (d += u) : d += n = m);
             }
-            f = e;
+            e = d;
           }
-          this.matcher && 1 < f.length && (this.v || (this.v = new RegExp("(" + this.g + ")", "g")), f = f.replace(this.v, k => this.matcher.get(k)));
-          if (f && this.replacer) {
-            for (e = 0; f && e < this.replacer.length; e += 2) {
-              f = f.replace(this.replacer[e], this.replacer[e + 1]);
+          this.matcher && 1 < e.length && (this.s || (this.s = new RegExp("(" + this.g + ")", "g")), e = e.replace(this.s, k => this.matcher.get(k)));
+          if (e && this.replacer) {
+            for (d = 0; e && d < this.replacer.length; d += 2) {
+              e = e.replace(this.replacer[d], this.replacer[d + 1]);
             }
           }
-          this.cache && h.length <= this.s && (this.j.set(h, f), this.j.size > this.C && (this.j.clear(), this.s = this.s / 1.1 | 0));
-          f && b.push(f);
+          this.cache && h.length <= this.o && (this.j.set(h, e), this.j.size > this.A && (this.j.clear(), this.o = this.o / 1.1 | 0));
+          e && b.push(e);
         }
       }
     }
   }
   this.finalize && (b = this.finalize(b) || b);
-  this.cache && a.length <= this.o && (this.i.set(a, b), this.i.size > this.C && (this.i.clear(), this.o = this.o / 1.1 | 0));
+  this.cache && a.length <= this.m && (this.i.set(a, b), this.i.size > this.A && (this.i.clear(), this.m = this.m / 1.1 | 0));
   return b;
 };
-function z(a) {
+function G(a) {
   a.l = null;
   a.i.clear();
   a.j.clear();
 }
-;let A, C;
-async function fa(a) {
-  a = a.data;
-  const c = a.task, b = a.id;
-  let d = a.args;
-  switch(c) {
-    case "init":
-      C = a.options || {};
-      (a = a.factory) ? (Function("return " + a)()(self), A = new self.FlexSearch.Index(C), delete self.FlexSearch) : A = new D(C);
-      postMessage({id:b});
-      break;
-    default:
-      let e;
-      "export" === c && (d = [C.export]);
-      "import" === c ? await C.import.call(A, A) : e = A[c].apply(A, d);
-      postMessage("search" === c ? {id:b, msg:e} : {id:b});
-  }
-}
-;let E, F;
-const G = {}, H = {};
-function ia(a) {
-  E = 0;
-  G[a] = H[a];
-}
-function I(a) {
-  this[a + "Async"] = function() {
-    const c = arguments;
-    var b = c[c.length - 1];
-    let d;
-    "function" === typeof b && (d = b, delete c[c.length - 1]);
-    E || (E = setTimeout(ia, 0, a), F = Date.now());
-    H[a] || (H[a] = G[a] = 1000);
-    if (!--G[a]) {
-      G[a] = H[a] = H[a] * this.priority * this.priority * 3 / (Date.now() - F) | 0 || 1;
-      E = clearTimeout(E);
-      const g = this;
-      return new Promise(f => {
-        setTimeout(function() {
-          f(g[a + "Async"].apply(g, c));
-        }, 0);
-      });
-    }
-    const e = this[a].apply(this, c);
-    b = e.then ? e : new Promise(g => g(e));
-    d && b.then(d);
-    return b;
-  };
-}
-;let J = 0;
-function K(a = {}) {
-  function c(f) {
-    function h(k) {
-      k = k.data || k;
-      const l = k.id, n = l && e.g[l];
-      n && (n(k.msg), delete e.g[l]);
-    }
-    this.worker = f;
-    this.g = w();
-    if (this.worker) {
-      d ? this.worker.on("message", h) : this.worker.onmessage = h;
-      if (a.config) {
-        return new Promise(function(k) {
-          e.g[++J] = function() {
-            k(e);
-          };
-          e.worker.postMessage({id:J, task:"init", factory:b, options:a});
-        });
-      }
-      this.worker.postMessage({task:"init", factory:b, options:a});
-      return this;
-    }
-  }
-  if (!this || this.constructor !== K) {
-    return new K(a);
-  }
-  let b = "undefined" !== typeof self ? self._factory : "undefined" !== typeof window ? window._factory : null;
-  b && (b = b.toString());
-  const d = "undefined" === typeof window, e = this, g = ja(b, d, a.worker);
-  return g.then ? g.then(function(f) {
-    return c.call(e, f);
-  }) : c.call(this, g);
-}
-L("add");
-L("append");
-L("search");
-L("update");
-L("remove");
-L("clear");
-L("export");
-L("import");
-var M = K.prototype;
-I.call(M, "add");
-I.call(M, "append");
-I.call(M, "search");
-I.call(M, "update");
-I.call(M, "remove");
-function L(a) {
-  K.prototype[a] = async function() {
-    const c = this, b = [].slice.call(arguments);
-    var d = b[b.length - 1];
-    let e;
-    "function" === typeof d && (e = d, b.splice(b.length - 1, 1));
-    d = new Promise(function(g) {
-      c.g[++J] = g;
-      c.worker.postMessage({task:a, id:J, args:b});
-    });
-    return e ? (d.then(e), this) : d;
-  };
-}
-function ja(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=" + fa.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 N(a, c, b, d, e) {
-  const g = a.length;
-  let f = [], h, k;
-  h = w();
-  for (let l = 0, n, m, r, q; l < c; l++) {
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-      if (r = a[p], l < r.length && (n = r[l])) {
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-          m = n[v], (k = h[m]) ? h[m]++ : (k = 0, h[m] = 1), q = f[k] || (f[k] = []), q.push(m);
-        }
-      }
-    }
-  }
-  if (a = f.length) {
-    if (e) {
-      f = 1 < f.length ? O(f, b, d) : (f = f[0]).length > b || d ? f.slice(d, b + d) : f;
-    } else {
-      if (a < g) {
-        return [];
-      }
-      f = f[a - 1];
-      if (b || d) {
-        if (f.length > b || d) {
-          f = f.slice(d, b + d);
-        }
-      }
-    }
-  }
-  return f;
-}
-function O(a, c, b) {
-  const d = [], e = w();
-  let g;
-  var f = a.length;
-  let h;
-  for (let k = f - 1; 0 <= k; k--) {
-    if (h = (f = a[k]) && f.length) {
-      for (let l = 0; l < h; l++) {
-        if (g = f[l], !e[g]) {
-          if (e[g] = 1, b) {
-            b--;
-          } else {
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-              return d;
-            }
-          }
-        }
-      }
-    }
-  }
-  return d;
-}
-;function P(a, c, b, d) {
+;function H(a, c, b) {
   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, d ? Q.call(this, a) : a;
+    return a = a[0], a = b || a.length > c ? c ? a.slice(b, b + c) : a.slice(b) : a;
   }
-  let e = [];
-  for (let g = 0, f, h; g < a.length; g++) {
-    if ((f = a[g]) && (h = f.length)) {
+  let f = [];
+  for (let d = 0, g, e; d < a.length; d++) {
+    if ((g = a[d]) && (e = g.length)) {
       if (b) {
-        if (b >= h) {
-          b -= h;
+        if (b >= e) {
+          b -= e;
           continue;
         }
-        b < h && (f = c ? f.slice(b, b + c) : f.slice(b), h = f.length, b = 0);
+        b < e && (g = c ? g.slice(b, b + c) : g.slice(b), e = g.length, b = 0);
       }
-      h > c && (f = f.slice(0, c), h = c);
-      if (!e.length && h >= c) {
-        return d ? Q.call(this, f) : f;
+      e > c && (g = g.slice(0, c), e = c);
+      if (!f.length && e >= c) {
+        return g;
       }
-      e.push(f);
-      c -= h;
+      f.push(g);
+      c -= e;
       if (!c) {
         break;
       }
     }
   }
-  e = 1 < e.length ? [].concat.apply([], e) : e[0];
-  return d ? Q.call(this, e) : e;
+  return f = 1 < f.length ? [].concat.apply([], f) : f[0];
 }
-;function S(a, c, b) {
-  var d = b[0];
-  if (d.then) {
-    return Promise.all(b).then(function(n) {
-      return a[c].apply(a, n);
-    });
-  }
-  if (d[0] && d[0].index) {
-    return a[c].apply(a, d);
-  }
-  d = [];
-  let e = [], g = 0, f = 0, h, k, l;
-  for (let n = 0, m; n < b.length; n++) {
-    if (m = b[n]) {
-      let r;
-      if (m.constructor === T) {
-        r = m.result;
-      } else if (m.constructor === Array) {
-        r = m;
-      } else {
-        if (g = m.limit || 0, f = m.offset || 0, l = m.suggest, k = m.resolve, h = m.enrich && k, m.index) {
-          m.resolve = !1, m.enrich = !1, r = m.index.search(m).result, m.resolve = k, m.enrich = h;
-        } else if (m.and) {
-          r = a.and(m.and);
-        } else if (m.or) {
-          r = a.or(m.or);
-        } else if (m.xor) {
-          r = a.xor(m.xor);
-        } else if (m.not) {
-          r = a.not(m.not);
-        } else {
-          continue;
-        }
-      }
-      if (r.then) {
-        e.push(r);
-      } else if (r.length) {
-        d[n] = r;
-      } else if (!l && ("and" === c || "xor" === c)) {
-        d = [];
-        break;
-      }
-    }
-  }
-  return {m:d, u:e, limit:g, offset:f, enrich:h, resolve:k, suggest:l};
-}
-;T.prototype.or = function() {
-  const {m:a, u:c, limit:b, offset:d, enrich:e, resolve:g} = S(this, "or", arguments);
-  return U.call(this, a, c, b, d, e, g);
-};
-function U(a, c, b, d, e, g) {
-  if (c.length) {
-    const f = this;
-    return Promise.all(c).then(function(h) {
-      a = [];
-      for (let k = 0, l; k < h.length; k++) {
-        (l = h[k]).length && (a[k] = l);
-      }
-      return U.call(f, a, [], b, d, e, g);
-    });
-  }
-  a.length && (this.result.length && a.push(this.result), 2 > a.length ? this.result = a[0] : (this.result = O(a, b, d), d = 0));
-  return g ? this.resolve(b, d, e) : this;
-}
-;T.prototype.and = function() {
-  let a = this.result.length, c, b, d, e;
-  if (!a) {
-    const g = arguments[0];
-    g && (a = !!g.suggest, e = g.resolve, c = g.limit, b = g.offset, d = g.enrich && e);
-  }
-  if (a) {
-    const {m:g, u:f, limit:h, offset:k, enrich:l, resolve:n, suggest:m} = S(this, "and", arguments);
-    return ka.call(this, g, f, h, k, l, n, m);
-  }
-  return e ? this.resolve(c, b, d) : this;
-};
-function ka(a, c, b, d, e, g, f) {
-  if (c.length) {
-    const h = this;
-    return Promise.all(c).then(function(k) {
-      a = [];
-      for (let l = 0, n; l < k.length; l++) {
-        (n = k[l]).length && (a[l] = n);
-      }
-      return ka.call(h, a, [], b, d, e, g, f);
-    });
-  }
-  if (a.length) {
-    if (this.result.length && a.unshift(this.result), 2 > a.length) {
-      this.result = a[0];
-    } else {
-      if (c = aa(a)) {
-        return this.result = N(a, c, b, d, f), g ? e ? Q.call(this.index, this.result) : this.result : this;
-      }
-      this.result = [];
-    }
-  } else {
-    f || (this.result = a);
-  }
-  return g ? this.resolve(b, d, e) : this;
-}
-;T.prototype.xor = function() {
-  const {m:a, u:c, limit:b, offset:d, enrich:e, resolve:g, suggest:f} = S(this, "xor", arguments);
-  return la.call(this, a, c, b, d, e, g, f);
-};
-function la(a, c, b, d, e, g, f) {
-  if (c.length) {
-    const h = this;
-    return Promise.all(c).then(function(k) {
-      a = [];
-      for (let l = 0, n; l < k.length; l++) {
-        (n = k[l]).length && (a[l] = n);
-      }
-      return la.call(h, a, [], b, d, e, g, f);
-    });
-  }
-  if (a.length) {
-    if (this.result.length && a.unshift(this.result), 2 > a.length) {
-      this.result = a[0];
-    } else {
-      return this.result = ma.call(this, a, b, d, g, this.g), g ? e ? Q.call(this.index, this.result) : this.result : this;
-    }
-  } else {
-    f || (this.result = a);
-  }
-  return g ? this.resolve(b, d, e) : this;
-}
-function ma(a, c, b, d, e) {
-  const g = [], f = w();
-  let h = 0;
-  for (let k = 0, l; k < a.length; k++) {
-    if (l = a[k]) {
-      h < l.length && (h = l.length);
-      for (let n = 0, m; n < l.length; n++) {
-        if (m = l[n]) {
-          for (let r = 0, q; r < m.length; r++) {
-            q = m[r], f[q] = f[q] ? 2 : 1;
-          }
-        }
-      }
-    }
-  }
-  for (let k = 0, l, n = 0; k < h; k++) {
-    for (let m = 0, r; m < a.length; m++) {
-      if (r = a[m]) {
-        if (l = r[k]) {
-          for (let q = 0, p; q < l.length; q++) {
-            if (p = l[q], 1 === f[p]) {
-              if (b) {
-                b--;
-              } else {
-                if (d) {
-                  if (g.push(p), g.length === c) {
-                    return g;
-                  }
-                } else {
-                  const v = k + (m ? e : 0);
-                  g[v] || (g[v] = []);
-                  g[v].push(p);
-                  if (++n === c) {
-                    return g;
-                  }
-                }
-              }
-            }
-          }
-        }
-      }
-    }
-  }
-  return g;
-}
-;T.prototype.not = function() {
-  const {m:a, u:c, limit:b, offset:d, enrich:e, resolve:g, suggest:f} = S(this, "not", arguments);
-  return na.call(this, a, c, b, d, e, g, f);
-};
-function na(a, c, b, d, e, g, f) {
-  if (c.length) {
-    const h = this;
-    return Promise.all(c).then(function(k) {
-      a = [];
-      for (let l = 0, n; l < k.length; l++) {
-        (n = k[l]).length && (a[l] = n);
-      }
-      return na.call(h, a, [], b, d, e, g, f);
-    });
-  }
-  if (a.length && this.result.length) {
-    this.result = oa.call(this, a, b, d, g);
-  } else if (g) {
-    return this.resolve(b, d, e);
-  }
-  return g ? e ? Q.call(this.index, this.result) : this.result : this;
-}
-function oa(a, c, b, d) {
-  const e = [];
-  a = new Set(a.flat().flat());
-  for (let g = 0, f, h = 0; g < this.result.length; g++) {
-    if (f = this.result[g]) {
-      for (let k = 0, l; k < f.length; k++) {
-        if (l = f[k], !a.has(l)) {
-          if (b) {
-            b--;
-          } else {
-            if (d) {
-              if (e.push(l), e.length === c) {
-                return e;
-              }
-            } else {
-              if (e[g] || (e[g] = []), e[g].push(l), ++h === c) {
-                return e;
-              }
-            }
-          }
-        }
-      }
-    }
-  }
-  return e;
-}
-;function T(a) {
-  if (!this || this.constructor !== T) {
-    return new T(a);
-  }
-  if (a && a.index) {
-    return a.resolve = !1, this.index = a.index, this.g = a.boost || 0, this.result = a.index.search(a).result, this;
-  }
-  this.index = null;
-  this.result = a || [];
-  this.g = 0;
-}
-T.prototype.limit = function(a) {
-  if (this.result.length) {
-    const c = [];
-    for (let b = 0, d; b < this.result.length; b++) {
-      if (d = this.result[b]) {
-        if (d.length <= a) {
-          if (c[b] = d, a -= d.length, !a) {
-            break;
-          }
-        } else {
-          c[b] = d.slice(0, a);
-          break;
-        }
-      }
-    }
-    this.result = c;
-  }
-  return this;
-};
-T.prototype.offset = function(a) {
-  if (this.result.length) {
-    const c = [];
-    for (let b = 0, d; b < this.result.length; b++) {
-      if (d = this.result[b]) {
-        d.length <= a ? a -= d.length : (c[b] = d.slice(a), a = 0);
-      }
-    }
-    this.result = c;
-  }
-  return this;
-};
-T.prototype.boost = function(a) {
-  this.g += a;
-  return this;
-};
-T.prototype.resolve = function(a, c, b) {
-  const d = this.result, e = this.index;
-  this.result = this.index = null;
-  return d.length ? ("object" === typeof a && (b = a.enrich, c = a.offset, a = a.limit), P.call(e, d, a || 100, c, b)) : d;
-};
-w();
-function Q(a) {
-  if (!this || !this.store) {
-    return a;
-  }
-  const c = Array(a.length);
-  for (let b = 0, d; b < a.length; b++) {
-    d = a[b], c[b] = {id:d, doc:this.store.get(d)};
-  }
-  return c;
-}
-;function V(a) {
+;w();
+function I(a) {
   this.limit = a && !0 !== a ? a : 1000;
   this.cache = new Map();
   this.g = "";
 }
-V.prototype.set = function(a, c) {
+I.prototype.set = function(a, c) {
   this.cache.set(this.g = a, c);
   this.cache.size > this.limit && this.cache.delete(this.cache.keys().next().value);
 };
-V.prototype.get = function(a) {
+I.prototype.get = function(a) {
   const c = this.cache.get(a);
   c && this.g !== a && (this.cache.delete(a), this.cache.set(this.g = a, c));
   return c;
 };
-V.prototype.remove = function(a) {
+I.prototype.remove = function(a) {
   for (const c of this.cache) {
     const b = c[0];
     c[1].includes(a) && this.cache.delete(b);
   }
 };
-V.prototype.clear = function() {
+I.prototype.clear = function() {
   this.cache.clear();
   this.g = "";
 };
-const pa = {normalize:function(a) {
+const J = {normalize:function(a) {
   return a.toLowerCase();
 }};
-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}}};
-D.prototype.add = function(a, c, b, d) {
+const K = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
+L.prototype.add = function(a, c, b, f) {
   if (c && (a || 0 === a)) {
-    if (!d && !b && this.reg.has(a)) {
+    if (!f && !b && this.reg.has(a)) {
       return this.update(a, c);
     }
     c = this.encoder.encode(c);
-    if (d = c.length) {
-      const l = w(), n = w(), m = this.depth, r = this.resolution;
-      for (let q = 0; q < d; q++) {
-        let p = c[this.rtl ? d - 1 - q : q];
-        var e = p.length;
-        if (e && (m || !n[p])) {
-          var g = this.score ? this.score(c, p, q, null, 0) : W(r, d, q), f = "";
+    if (f = c.length) {
+      const n = w(), m = w(), u = this.depth, C = this.resolution;
+      for (let p = 0; p < f; p++) {
+        let l = c[this.rtl ? f - 1 - p : p];
+        var d = l.length;
+        if (d && (u || !m[l])) {
+          var g = this.score ? this.score(c, l, p, null, 0) : M(C, f, p), e = "";
           switch(this.tokenize) {
             case "full":
-              if (2 < e) {
-                for (g = 0; g < e; g++) {
-                  for (var h = e; h > g; h--) {
-                    f = p.substring(g, h);
-                    var k = this.score ? this.score(c, p, q, f, g) : W(r, d, q, e, g);
-                    X(this, n, f, k, a, b);
+              if (2 < d) {
+                for (g = 0; g < d; g++) {
+                  for (var h = d; h > g; h--) {
+                    e = l.substring(g, h);
+                    var k = this.score ? this.score(c, l, p, e, g) : M(C, f, p, d, g);
+                    N(this, m, e, k, a, b);
                   }
                 }
                 break;
               }
             case "reverse":
-              if (1 < e) {
-                for (h = e - 1; 0 < h; h--) {
-                  f = p[h] + f, k = this.score ? this.score(c, p, q, f, h) : W(r, d, q, e, h), X(this, n, f, k, a, b);
+              if (1 < d) {
+                for (h = d - 1; 0 < h; h--) {
+                  e = l[h] + e, k = this.score ? this.score(c, l, p, e, h) : M(C, f, p, d, h), N(this, m, e, k, a, b);
                 }
-                f = "";
+                e = "";
               }
             case "forward":
-              if (1 < e) {
-                for (h = 0; h < e; h++) {
-                  f += p[h], X(this, n, f, g, a, b);
+              if (1 < d) {
+                for (h = 0; h < d; h++) {
+                  e += l[h], N(this, m, e, g, a, b);
                 }
                 break;
               }
             default:
-              if (X(this, n, p, g, a, b), m && 1 < d && q < d - 1) {
-                for (e = w(), f = this.B, g = p, h = Math.min(m + 1, d - q), e[g] = 1, k = 1; k < h; k++) {
-                  if ((p = c[this.rtl ? d - 1 - q - k : q + k]) && !e[p]) {
-                    e[p] = 1;
-                    const v = this.score ? this.score(c, g, q, p, k) : W(f + (d / 2 > f ? 0 : 1), d, q, h - 1, k - 1), B = this.bidirectional && p > g;
-                    X(this, l, B ? g : p, v, a, b, B ? p : g);
+              if (N(this, m, l, g, a, b), u && 1 < f && p < f - 1) {
+                for (d = w(), e = this.v, g = l, h = Math.min(u + 1, f - p), d[g] = 1, k = 1; k < h; k++) {
+                  if ((l = c[this.rtl ? f - 1 - p - k : p + k]) && !d[l]) {
+                    d[l] = 1;
+                    const v = this.score ? this.score(c, g, p, l, k) : M(e + (f / 2 > e ? 0 : 1), f, p, h - 1, k - 1), t = this.bidirectional && l > g;
+                    N(this, n, t ? g : l, v, a, b, t ? l : g);
                   }
                 }
               }
@@ -799,134 +345,182 @@ D.prototype.add = function(a, c, b, d) {
   }
   return this;
 };
-function X(a, c, b, d, e, g, f) {
-  let h = f ? a.ctx : a.map, k;
-  if (!c[b] || f && !(k = c[b])[f]) {
-    f ? (c = k || (c[b] = w()), c[f] = 1, (k = h.get(f)) ? h = k : h.set(f, h = new Map())) : c[b] = 1, (k = h.get(b)) ? h = k : h.set(b, h = []), h = h[d] || (h[d] = []), g && h.includes(e) || (h.push(e), a.fastupdate && ((c = a.reg.get(e)) ? c.push(h) : a.reg.set(e, [h])));
+function N(a, c, b, f, d, g, e) {
+  let h = e ? a.ctx : a.map, k;
+  if (!c[b] || e && !(k = c[b])[e]) {
+    e ? (c = k || (c[b] = w()), c[e] = 1, (k = h.get(e)) ? h = k : h.set(e, h = new Map())) : c[b] = 1, (k = h.get(b)) ? h = k : h.set(b, h = []), h = h[f] || (h[f] = []), g && h.includes(d) || (h.push(d), a.fastupdate && ((c = a.reg.get(d)) ? c.push(h) : a.reg.set(d, [h])));
   }
 }
-function W(a, c, b, d, e) {
-  return b && 1 < a ? c + (d || 0) <= a ? b + (e || 0) : (a - 1) / (c + (d || 0)) * (b + (e || 0)) + 1 | 0 : 0;
+function M(a, c, b, f, d) {
+  return b && 1 < a ? c + (f || 0) <= a ? b + (d || 0) : (a - 1) / (c + (f || 0)) * (b + (d || 0)) + 1 | 0 : 0;
 }
-;D.prototype.search = function(a, c, b) {
+;L.prototype.search = function(a, c, b) {
   b || (c || "object" !== typeof a ? "object" === typeof c && (b = c, c = 0) : (b = a, a = ""));
-  var d = [], e = 0;
+  var f = [], d = 0;
   if (b) {
     a = b.query || a;
     c = b.limit || c;
-    e = b.offset || 0;
+    d = b.offset || 0;
     var g = b.context;
-    var f = b.suggest;
+    var e = b.suggest;
     var h = !0;
     var k = b.resolution;
   } else {
     h = !0;
   }
-  b = this.encoder.encode(a);
-  a = b.length;
+  a = this.encoder.encode(a);
+  b = a.length;
   c = c || (h ? 100 : 0);
-  if (1 === a) {
-    return ra.call(this, b[0], "", c, e, h);
+  if (1 === b) {
+    return e = d, (d = O(this, a[0], "")) && d.length ? H.call(this, d, c, e) : [];
   }
   g = this.depth && !1 !== g;
-  if (2 === a && g && !f) {
-    return ra.call(this, b[0], b[1], c, e, h);
+  if (2 === b && g && !e) {
+    return e = d, (d = O(this, a[0], a[1])) && d.length ? H.call(this, d, c, e) : [];
   }
   h = w();
-  let l = 0;
-  if (1 < a && g) {
-    var n = b[0];
-    l = 1;
+  var n = 0;
+  if (1 < b && g) {
+    var m = a[0];
+    n = 1;
   }
-  k || 0 === k || (k = n ? this.B : this.resolution);
-  for (let p, v; l < a; l++) {
-    if ((v = b[l]) && !h[v]) {
+  k || 0 === k || (k = m ? this.v : this.resolution);
+  for (let l, v; n < b; n++) {
+    if ((v = a[n]) && !h[v]) {
       h[v] = 1;
-      p = sa(this, v, n);
+      l = O(this, v, m);
       a: {
-        g = p;
-        var m = d, r = f, q = k;
-        let B = [];
+        g = l;
+        var u = f, C = e, p = k;
+        let t = [];
         if (g && g.length) {
-          if (g.length <= q) {
-            m.push(g);
-            p = void 0;
+          if (g.length <= p) {
+            u.push(g);
+            l = void 0;
             break a;
           }
-          for (let R = 0, ha; R < q; R++) {
-            if (ha = g[R]) {
-              B[R] = ha;
+          for (let x = 0, E; x < p; x++) {
+            if (E = g[x]) {
+              t[x] = E;
             }
           }
-          if (B.length) {
-            m.push(B);
-            p = void 0;
+          if (t.length) {
+            u.push(t);
+            l = void 0;
             break a;
           }
         }
-        p = r ? void 0 : B;
+        l = C ? void 0 : t;
       }
-      if (p) {
-        d = p;
+      if (l) {
+        f = l;
         break;
       }
-      n && (f && p && d.length || (n = v));
+      m && (e && l && f.length || (m = v));
     }
-    f && n && l === a - 1 && !d.length && (n = "", l = -1, h = w());
+    e && m && n === b - 1 && !f.length && (m = "", n = -1, h = w());
   }
   a: {
-    n = d.length;
-    a = d;
-    if (1 < n) {
-      a = N(d, k, c, e, f);
-    } else if (1 === n) {
-      f = P.call(null, d[0], c, e);
+    a = f;
+    f = a.length;
+    m = a;
+    if (1 < f) {
+      b: {
+        f = e;
+        m = a.length;
+        e = [];
+        b = w();
+        for (let l = 0, v, t, x, E; l < k; l++) {
+          for (n = 0; n < m; n++) {
+            if (x = a[n], l < x.length && (v = x[l])) {
+              for (g = 0; g < v.length; g++) {
+                t = v[g], (h = b[t]) ? b[t]++ : (h = 0, b[t] = 1), E = e[h] || (e[h] = []), E.push(t);
+              }
+            }
+          }
+        }
+        if (a = e.length) {
+          if (f) {
+            if (1 < e.length) {
+              c: {
+                for (a = [], k = w(), f = e.length, h = f - 1; 0 <= h; h--) {
+                  if (b = (f = e[h]) && f.length) {
+                    for (n = 0; n < b; n++) {
+                      if (m = f[n], !k[m]) {
+                        if (k[m] = 1, d) {
+                          d--;
+                        } else {
+                          if (a.push(m), a.length === c) {
+                            break c;
+                          }
+                        }
+                      }
+                    }
+                  }
+                }
+              }
+            } else {
+              a = (e = e[0]).length > c || d ? e.slice(d, c + d) : e;
+            }
+            e = a;
+          } else {
+            if (a < m) {
+              m = [];
+              break b;
+            }
+            e = e[a - 1];
+            if (c || d) {
+              if (e.length > c || d) {
+                e = e.slice(d, c + d);
+              }
+            }
+          }
+        }
+        m = e;
+      }
+    } else if (1 === f) {
+      c = H.call(null, a[0], c, d);
       break a;
     }
-    f = a;
+    c = m;
   }
-  return f;
+  return c;
 };
-function ra(a, c, b, d, e) {
-  a = sa(this, a, c);
-  e = !0;
-  return a && a.length ? e ? P.call(this, a, b, d) : new T(a) : e ? [] : new T();
-}
-function sa(a, c, b) {
-  let d;
-  b && (d = a.bidirectional && c > b) && (d = b, b = c, c = d);
+function O(a, c, b) {
+  let f;
+  b && (f = a.bidirectional && c > b) && (f = b, b = c, c = f);
   a = b ? (a = a.ctx.get(b)) && a.get(c) : a.map.get(c);
   return a;
 }
-;D.prototype.remove = function(a, c) {
+;L.prototype.remove = function(a, c) {
   const b = this.reg.size && (this.fastupdate ? this.reg.get(a) : this.reg.has(a));
   if (b) {
     if (this.fastupdate) {
-      for (let d = 0, e; d < b.length; d++) {
-        if (e = b[d]) {
-          if (2 > e.length) {
-            e.pop();
+      for (let f = 0, d; f < b.length; f++) {
+        if (d = b[f]) {
+          if (2 > d.length) {
+            d.pop();
           } else {
-            const g = e.indexOf(a);
-            g === b.length - 1 ? e.pop() : e.splice(g, 1);
+            const g = d.indexOf(a);
+            g === b.length - 1 ? d.pop() : d.splice(g, 1);
           }
         }
       }
     } else {
-      Y(this.map, a), this.depth && Y(this.ctx, a);
+      P(this.map, a), this.depth && P(this.ctx, a);
     }
     c || this.reg.delete(a);
   }
   this.cache && this.cache.remove(a);
   return this;
 };
-function Y(a, c) {
+function P(a, c) {
   let b = 0;
   if (a.constructor === Array) {
-    for (let d = 0, e, g; d < a.length; d++) {
-      if ((e = a[d]) && e.length) {
-        if (g = e.indexOf(c), 0 <= g) {
-          1 < e.length ? (e.splice(g, 1), b++) : delete a[d];
+    for (let f = 0, d, g; f < a.length; f++) {
+      if ((d = a[f]) && d.length) {
+        if (g = d.indexOf(c), 0 <= g) {
+          1 < d.length ? (d.splice(g, 1), b++) : delete a[f];
           break;
         } else {
           b++;
@@ -934,97 +528,97 @@ function Y(a, c) {
       }
     }
   } else {
-    for (let d of a.entries()) {
-      const e = d[0], g = Y(d[1], c);
-      g ? b += g : a.delete(e);
+    for (let f of a.entries()) {
+      const d = f[0], g = P(f[1], c);
+      g ? b += g : a.delete(d);
     }
   }
   return b;
 }
-;function D(a, c) {
-  if (!this || this.constructor !== D) {
-    return new D(a);
+;function L(a, c) {
+  if (!this || this.constructor !== L) {
+    return new L(a);
   }
   if (a) {
     var b = "string" === typeof a ? a : a.preset;
-    b && (qa[b] || console.warn("Preset not found: " + b), a = Object.assign({}, qa[b], a));
+    b && (K[b] || console.warn("Preset not found: " + b), a = Object.assign({}, K[b], a));
   } else {
     a = {};
   }
   b = a.context;
-  const d = !0 === b ? {depth:1} : b || {}, e = a.encode || a.encoder || pa;
-  this.encoder = e.encode ? e : "object" === typeof e ? new y(e) : {encode:e};
+  const f = !0 === b ? {depth:1} : b || {}, d = a.encode || a.encoder || J;
+  this.encoder = d.encode ? d : "object" === typeof d ? new F(d) : {encode:d};
   this.resolution = a.resolution || 9;
-  this.tokenize = b = a.tokenize || "strict";
-  this.depth = "strict" === b && d.depth || 0;
-  this.bidirectional = !1 !== d.bidirectional;
+  this.tokenize = (b = a.tokenize) && "default" !== b || "strict";
+  this.depth = "strict" === b && f.depth || 0;
+  this.bidirectional = !1 !== f.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.B = d.resolution || 3;
-  this.rtl = e.rtl || a.rtl || !1;
-  this.cache = (b = a.cache || null) && new V(b);
+  this.v = f.resolution || 3;
+  this.rtl = d.rtl || a.rtl || !1;
+  this.cache = (b = a.cache || null) && new I(b);
 }
-t = D.prototype;
-t.clear = function() {
+q = L.prototype;
+q.clear = function() {
   this.map.clear();
   this.ctx.clear();
   this.reg.clear();
   this.cache && this.cache.clear();
   return this;
 };
-t.append = function(a, c) {
+q.append = function(a, c) {
   return this.add(a, c, !0);
 };
-t.contain = function(a) {
+q.contain = function(a) {
   return this.reg.has(a);
 };
-t.update = function(a, c) {
-  const b = this, d = this.remove(a);
-  return d && d.then ? d.then(() => b.add(a, c)) : this.add(a, c);
+q.update = function(a, c) {
+  const b = this, f = this.remove(a);
+  return f && f.then ? f.then(() => b.add(a, c)) : this.add(a, c);
 };
-function Z(a) {
+function Q(a) {
   let c = 0;
   if (a.constructor === Array) {
-    for (let b = 0, d; b < a.length; b++) {
-      (d = a[b]) && (c += d.length);
+    for (let b = 0, f; b < a.length; b++) {
+      (f = a[b]) && (c += f.length);
     }
   } else {
     for (const b of a) {
-      const d = b[0], e = Z(b[1]);
-      e ? c += e : a.delete(d);
+      const f = b[0], d = Q(b[1]);
+      d ? c += d : a.delete(f);
     }
   }
   return c;
 }
-t.cleanup = function() {
+q.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
-  Z(this.map);
-  this.depth && Z(this.ctx);
+  Q(this.map);
+  this.depth && Q(this.ctx);
   return this;
 };
-t.searchCache = function(a, c, b) {
+q.searchCache = function(a, c, b) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
-  this.cache || (this.cache = new V());
-  let d = this.cache.get(a);
-  if (!d) {
-    d = this.search(a, c, b);
-    if (d.then) {
-      const e = this;
-      d.then(function(g) {
-        e.cache.set(a, g);
+  this.cache || (this.cache = new I());
+  let f = this.cache.get(a);
+  if (!f) {
+    f = this.search(a, c, b);
+    if (f.then) {
+      const d = this;
+      f.then(function(g) {
+        d.cache.set(a, g);
         return g;
       });
     }
-    this.cache.set(a, d);
+    this.cache.set(a, f);
   }
-  return d;
+  return f;
 };
-export default {Index:D, Charset:null, Encoder:y, Document:null, Worker:null, Resolver:null, IndexedDB:null, Language:{}};
+export default {Index:L, Charset:null, Encoder:F, Document:null, Worker:null, Resolver:null, IndexedDB:null, Language:{}};
 
-export const Index=D;export const  Charset=null;export const  Encoder=y;export const  Document=null;export const  Worker=null;export const  Resolver=null;export const  IndexedDB=null;export const  Language={};
\ No newline at end of file
+export const Index=L;export const  Charset=null;export const  Encoder=F;export const  Document=null;export const  Worker=null;export const  Resolver=null;export const  IndexedDB=null;export const  Language={};
\ No newline at end of file
diff --git a/dist/flexsearch.light.module.min.js b/dist/flexsearch.light.module.min.js
index acae027..2fe41ef 100644
--- a/dist/flexsearch.light.module.min.js
+++ b/dist/flexsearch.light.module.min.js
@@ -1,41 +1,28 @@
 /**!
- * FlexSearch.js v0.8.108 (Bundle)
+ * FlexSearch.js v0.8.109 (Bundle)
  * Author and Copyright: Thomas Wilkerling
  * Licence: Apache-2.0
  * Hosted by Nextapps GmbH
  * https://github.com/nextapps-de/flexsearch
  */
-var t;function u(a,c,b){const d=typeof b,e=typeof a;if("undefined"!==d){if("undefined"!==e){if(b){if("function"===e&&d===e)return function(h){return a(b(h))};c=a.constructor;if(c===b.constructor){if(c===Array)return b.concat(a);if(c===Map){var g=new Map(b);for(var f of a)g.set(f[0],f[1]);return g}if(c===Set){f=new Set(b);for(g of a.values())f.add(g);return f}}}return a}return b}return"undefined"===e?c:a}function w(){return Object.create(null)}
-function aa(a){let c=0;for(let b=0,d;b<a.length;b++)(d=a[b])&&c<d.length&&(c=d.length);return c};const ba=/[^\p{L}\p{N}]+/u,ca=/(\d{3})/g,da=/(\D)(\d{3})/g,ea=/(\d{3})(\D)/g,x="".normalize&&/[\u0300-\u036f]/g;function y(a){if(!this||this.constructor!==y)return new y(...arguments);for(let c=0;c<arguments.length;c++)this.assign(arguments[c])}t=y.prototype;
-t.assign=function(a){this.normalize=u(a.normalize,!0,this.normalize);let c=a.include,b=c||a.exclude||a.split,d;if(b||""===b){if("object"===typeof b&&b.constructor!==RegExp){let e="";d=!c;c||(e+="\\p{Z}");b.letter&&(e+="\\p{L}");b.number&&(e+="\\p{N}",d=!!c);b.symbol&&(e+="\\p{S}");b.punctuation&&(e+="\\p{P}");b.control&&(e+="\\p{C}");if(b=b.char)e+="object"===typeof b?b.join(""):b;try{this.split=new RegExp("["+(c?"^":"")+e+"]+","u")}catch(g){this.split=/\s+/}}else this.split=b,d=!1===b||2>"a1a".split(b).length;
-this.numeric=u(a.numeric,d)}else{try{this.split=u(this.split,ba)}catch(e){this.split=/\s+/}this.numeric=u(a.numeric,u(this.numeric,!0))}this.prepare=u(a.prepare,null,this.prepare);this.finalize=u(a.finalize,null,this.finalize);this.rtl=u(a.rtl,!1,this.rtl);this.dedupe=u(a.dedupe,!1,this.dedupe);this.filter=u((b=a.filter)&&new Set(b),null,this.filter);this.matcher=u((b=a.matcher)&&new Map(b),null,this.matcher);this.mapper=u((b=a.mapper)&&new Map(b),null,this.mapper);this.stemmer=u((b=a.stemmer)&&new Map(b),
-null,this.stemmer);this.replacer=u(a.replacer,null,this.replacer);this.minlength=u(a.minlength,1,this.minlength);this.maxlength=u(a.maxlength,0,this.maxlength);if(this.cache=b=u(a.cache,!0,this.cache))this.l=null,this.C="number"===typeof b?b:2E5,this.i=new Map,this.j=new Map,this.s=this.o=128;this.g="";this.v=null;this.h="";this.A=null;if(this.matcher)for(const e of this.matcher.keys())this.g+=(this.g?"|":"")+e;if(this.stemmer)for(const e of this.stemmer.keys())this.h+=(this.h?"|":"")+e;return this};
-t.addStemmer=function(a,c){this.stemmer||(this.stemmer=new Map);this.stemmer.set(a,c);this.h+=(this.h?"|":"")+a;this.A=null;this.cache&&z(this);return this};t.addFilter=function(a){this.filter||(this.filter=new Set);this.filter.add(a);this.cache&&z(this);return this};t.addMapper=function(a,c){if("object"===typeof a)return this.addReplacer(a,c);if(1<a.length)return this.addMatcher(a,c);this.mapper||(this.mapper=new Map);this.mapper.set(a,c);this.cache&&z(this);return this};
-t.addMatcher=function(a,c){if("object"===typeof a)return this.addReplacer(a,c);if(2>a.length&&(this.dedupe||this.mapper))return this.addMapper(a,c);this.matcher||(this.matcher=new Map);this.matcher.set(a,c);this.g+=(this.g?"|":"")+a;this.v=null;this.cache&&z(this);return this};t.addReplacer=function(a,c){if("string"===typeof a)return this.addMatcher(a,c);this.replacer||(this.replacer=[]);this.replacer.push(a,c);this.cache&&z(this);return this};
-t.encode=function(a){if(this.cache&&a.length<=this.o)if(this.l){if(this.i.has(a))return this.i.get(a)}else this.l=setTimeout(z,50,this);this.normalize&&("function"===typeof this.normalize?a=this.normalize(a):a=x?a.normalize("NFKD").replace(x,"").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,"$1 "));const c=!(this.dedupe||this.mapper||this.filter||this.matcher||this.stemmer||this.replacer);let b=[],
-d=this.split||""===this.split?a.split(this.split):a;for(let g=0,f,h;g<d.length;g++)if((f=h=d[g])&&!(f.length<this.minlength))if(c)b.push(f);else if(!this.filter||!this.filter.has(f)){if(this.cache&&f.length<=this.s)if(this.l){var e=this.j.get(f);if(e||""===e){e&&b.push(e);continue}}else this.l=setTimeout(z,50,this);this.stemmer&&2<f.length&&(this.A||(this.A=new RegExp("(?!^)("+this.h+")$")),f=f.replace(this.A,k=>this.stemmer.get(k)),f.length<this.minlength||this.filter&&this.filter.has(f))&&(f="");
-if(f&&(this.mapper||this.dedupe&&1<f.length)){e="";for(let k=0,l="",n,m;k<f.length;k++)n=f.charAt(k),n===l&&this.dedupe||((m=this.mapper&&this.mapper.get(n))||""===m?m===l&&this.dedupe||!(l=m)||(e+=m):e+=l=n);f=e}this.matcher&&1<f.length&&(this.v||(this.v=new RegExp("("+this.g+")","g")),f=f.replace(this.v,k=>this.matcher.get(k)));if(f&&this.replacer)for(e=0;f&&e<this.replacer.length;e+=2)f=f.replace(this.replacer[e],this.replacer[e+1]);this.cache&&h.length<=this.s&&(this.j.set(h,f),this.j.size>this.C&&
-(this.j.clear(),this.s=this.s/1.1|0));f&&b.push(f)}this.finalize&&(b=this.finalize(b)||b);this.cache&&a.length<=this.o&&(this.i.set(a,b),this.i.size>this.C&&(this.i.clear(),this.o=this.o/1.1|0));return b};function z(a){a.l=null;a.i.clear();a.j.clear()};let A,C;async function ha(a){a=a.data;const c=a.task,b=a.id;let d=a.args;switch(c){case "init":C=a.options||{};(a=a.factory)?(Function("return "+a)()(self),A=new self.FlexSearch.Index(C),delete self.FlexSearch):A=new D(C);postMessage({id:b});break;default:let e;"export"===c&&(d=[C.export]);"import"===c?await C.import.call(A,A):e=A[c].apply(A,d);postMessage("search"===c?{id:b,msg:e}:{id:b})}};let E,F;const G={},H={};function ia(a){E=0;G[a]=H[a]}
-function I(a){this[a+"Async"]=function(){const c=arguments;var b=c[c.length-1];let d;"function"===typeof b&&(d=b,delete c[c.length-1]);E||(E=setTimeout(ia,0,a),F=Date.now());H[a]||(H[a]=G[a]=1E3);if(!--G[a]){G[a]=H[a]=H[a]*this.priority*this.priority*3/(Date.now()-F)|0||1;E=clearTimeout(E);const g=this;return new Promise(f=>{setTimeout(function(){f(g[a+"Async"].apply(g,c))},0)})}const e=this[a].apply(this,c);b=e.then?e:new Promise(g=>g(e));d&&b.then(d);return b}};let J=0;
-function K(a={}){function c(f){function h(k){k=k.data||k;const l=k.id,n=l&&e.g[l];n&&(n(k.msg),delete e.g[l])}this.worker=f;this.g=w();if(this.worker){d?this.worker.on("message",h):this.worker.onmessage=h;if(a.config)return new Promise(function(k){e.g[++J]=function(){k(e)};e.worker.postMessage({id:J,task:"init",factory:b,options:a})});this.worker.postMessage({task:"init",factory:b,options:a});return this}}if(!this||this.constructor!==K)return new K(a);let b="undefined"!==typeof self?self._factory:"undefined"!==
-typeof window?window._factory:null;b&&(b=b.toString());const d="undefined"===typeof window,e=this,g=ja(b,d,a.worker);return g.then?g.then(function(f){return c.call(e,f)}):c.call(this,g)}L("add");L("append");L("search");L("update");L("remove");L("clear");L("export");L("import");var M=K.prototype;I.call(M,"add");I.call(M,"append");I.call(M,"search");I.call(M,"update");I.call(M,"remove");
-function L(a){K.prototype[a]=async function(){const c=this,b=[].slice.call(arguments);var d=b[b.length-1];let e;"function"===typeof d&&(e=d,b.splice(b.length-1,1));d=new Promise(function(g){c.g[++J]=g;c.worker.postMessage({task:a,id:J,args:b})});return e?(d.then(e),this):d}}
-function ja(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="+ha.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",
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-function O(a,c,b){const d=[],e=w();let g;var f=a.length;let h;for(let k=f-1;0<=k;k--)if(h=(f=a[k])&&f.length)for(let l=0;l<h;l++)if(g=f[l],!e[g])if(e[g]=1,b)b--;else if(d.push(g),d.length===c)return d;return d};function P(a,c,b,d){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,d?Q.call(this,a):a;let e=[];for(let g=0,f,h;g<a.length;g++)if((f=a[g])&&(h=f.length)){if(b){if(b>=h){b-=h;continue}b<h&&(f=c?f.slice(b,b+c):f.slice(b),h=f.length,b=0)}h>c&&(f=f.slice(0,c),h=c);if(!e.length&&h>=c)return d?Q.call(this,f):f;e.push(f);c-=h;if(!c)break}e=1<e.length?[].concat.apply([],e):e[0];return d?Q.call(this,e):e};function S(a,c,b){var d=b[0];if(d.then)return Promise.all(b).then(function(n){return a[c].apply(a,n)});if(d[0]&&d[0].index)return a[c].apply(a,d);d=[];let e=[],g=0,f=0,h,k,l;for(let n=0,m;n<b.length;n++)if(m=b[n]){let r;if(m.constructor===T)r=m.result;else if(m.constructor===Array)r=m;else if(g=m.limit||0,f=m.offset||0,l=m.suggest,k=m.resolve,h=m.enrich&&k,m.index)m.resolve=!1,r=m.index.search(m).result,m.resolve=k;else if(m.and)r=a.and(m.and);else if(m.or)r=a.or(m.or);else if(m.xor)r=a.xor(m.xor);
-else if(m.not)r=a.not(m.not);else continue;if(r.then)e.push(r);else if(r.length)d[n]=r;else if(!l&&("and"===c||"xor"===c)){d=[];break}}return{m:d,u:e,limit:g,offset:f,enrich:h,resolve:k,suggest:l}};T.prototype.or=function(){const {m:a,u:c,limit:b,offset:d,enrich:e,resolve:g}=S(this,"or",arguments);return U.call(this,a,c,b,d,e,g)};function U(a,c,b,d,e,g){if(c.length){const f=this;return Promise.all(c).then(function(h){a=[];for(let k=0,l;k<h.length;k++)(l=h[k]).length&&(a[k]=l);return U.call(f,a,[],b,d,e,g)})}a.length&&(this.result.length&&a.push(this.result),2>a.length?this.result=a[0]:(this.result=O(a,b,d),d=0));return g?this.resolve(b,d,e):this};T.prototype.and=function(){let a=this.result.length,c,b,d,e;if(!a){const g=arguments[0];g&&(a=!!g.suggest,e=g.resolve,c=g.limit,b=g.offset,d=g.enrich&&e)}if(a){const {m:g,u:f,limit:h,offset:k,enrich:l,resolve:n,suggest:m}=S(this,"and",arguments);return ka.call(this,g,f,h,k,l,n,m)}return e?this.resolve(c,b,d):this};
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-function oa(a,c,b,d){const e=[];a=new Set(a.flat().flat());for(let g=0,f,h=0;g<this.result.length;g++)if(f=this.result[g])for(let k=0,l;k<f.length;k++)if(l=f[k],!a.has(l))if(b)b--;else if(d){if(e.push(l),e.length===c)return e}else if(e[g]||(e[g]=[]),e[g].push(l),++h===c)return e;return e};function T(a){if(!this||this.constructor!==T)return new T(a);if(a&&a.index)return a.resolve=!1,this.index=a.index,this.g=a.boost||0,this.result=a.index.search(a).result,this;this.index=null;this.result=a||[];this.g=0}T.prototype.limit=function(a){if(this.result.length){const c=[];for(let b=0,d;b<this.result.length;b++)if(d=this.result[b])if(d.length<=a){if(c[b]=d,a-=d.length,!a)break}else{c[b]=d.slice(0,a);break}this.result=c}return this};
-T.prototype.offset=function(a){if(this.result.length){const c=[];for(let b=0,d;b<this.result.length;b++)if(d=this.result[b])d.length<=a?a-=d.length:(c[b]=d.slice(a),a=0);this.result=c}return this};T.prototype.boost=function(a){this.g+=a;return this};T.prototype.resolve=function(a,c,b){const d=this.result,e=this.index;this.result=this.index=null;return d.length?("object"===typeof a&&(b=a.enrich,c=a.offset,a=a.limit),P.call(e,d,a||100,c,b)):d};w();function Q(a){if(!this||!this.store)return a;const c=Array(a.length);for(let b=0,d;b<a.length;b++)d=a[b],c[b]={id:d,doc:this.store.get(d)};return c};function V(a){this.limit=a&&!0!==a?a:1E3;this.cache=new Map;this.g=""}V.prototype.set=function(a,c){this.cache.set(this.g=a,c);this.cache.size>this.limit&&this.cache.delete(this.cache.keys().next().value)};V.prototype.get=function(a){const c=this.cache.get(a);c&&this.g!==a&&(this.cache.delete(a),this.cache.set(this.g=a,c));return c};V.prototype.remove=function(a){for(const c of this.cache){const b=c[0];c[1].includes(a)&&this.cache.delete(b)}};
-V.prototype.clear=function(){this.cache.clear();this.g=""};const pa={normalize:function(a){return a.toLowerCase()}};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}}};D.prototype.add=function(a,c,b,d){if(c&&(a||0===a)){if(!d&&!b&&this.reg.has(a))return this.update(a,c);c=this.encoder.encode(c);if(d=c.length){const l=w(),n=w(),m=this.depth,r=this.resolution;for(let q=0;q<d;q++){let p=c[this.rtl?d-1-q:q];var e=p.length;if(e&&(m||!n[p])){var g=this.score?this.score(c,p,q,null,0):W(r,d,q),f="";switch(this.tokenize){case "full":if(2<e){for(g=0;g<e;g++)for(var h=e;h>g;h--){f=p.substring(g,h);var k=this.score?this.score(c,p,q,f,g):W(r,d,q,e,g);X(this,n,f,k,a,b)}break}case "reverse":if(1<
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-function X(a,c,b,d,e,g,f){let h=f?a.ctx:a.map,k;if(!c[b]||f&&!(k=c[b])[f])f?(c=k||(c[b]=w()),c[f]=1,(k=h.get(f))?h=k:h.set(f,h=new Map)):c[b]=1,(k=h.get(b))?h=k:h.set(b,h=[]),h=h[d]||(h[d]=[]),g&&h.includes(e)||(h.push(e),a.fastupdate&&((c=a.reg.get(e))?c.push(h):a.reg.set(e,[h])))}function W(a,c,b,d,e){return b&&1<a?c+(d||0)<=a?b+(e||0):(a-1)/(c+(d||0))*(b+(e||0))+1|0:0};D.prototype.search=function(a,c,b){b||(c||"object"!==typeof a?"object"===typeof c&&(b=c,c=0):(b=a,a=""));var d=[],e=0;if(b){a=b.query||a;c=b.limit||c;e=b.offset||0;var g=b.context;var f=b.suggest;var h=!0;var k=b.resolution}else h=!0;b=this.encoder.encode(a);a=b.length;c=c||(h?100:0);if(1===a)return ra.call(this,b[0],"",c,e,h);g=this.depth&&!1!==g;if(2===a&&g&&!f)return ra.call(this,b[0],b[1],c,e,h);h=w();let l=0;if(1<a&&g){var n=b[0];l=1}k||0===k||(k=n?this.B:this.resolution);for(let p,v;l<a;l++){if((v=
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-function Y(a,c){let b=0;if(a.constructor===Array)for(let d=0,e,g;d<a.length;d++){if((e=a[d])&&e.length)if(g=e.indexOf(c),0<=g){1<e.length?(e.splice(g,1),b++):delete a[d];break}else b++}else for(let d of a.entries()){const e=d[0],g=Y(d[1],c);g?b+=g:a.delete(e)}return b};function D(a,c){if(!this||this.constructor!==D)return new D(a);if(a){var b="string"===typeof a?a:a.preset;b&&(a=Object.assign({},qa[b],a))}else a={};b=a.context;const d=!0===b?{depth:1}:b||{},e=a.encode||a.encoder||pa;this.encoder=e.encode?e:"object"===typeof e?new y(e):{encode:e};this.resolution=a.resolution||9;this.tokenize=b=a.tokenize||"strict";this.depth="strict"===b&&d.depth||0;this.bidirectional=!1!==d.bidirectional;this.fastupdate=!!a.fastupdate;this.score=a.score||null;b=!1;this.map=new Map;
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-function Z(a){let c=0;if(a.constructor===Array)for(let b=0,d;b<a.length;b++)(d=a[b])&&(c+=d.length);else for(const b of a){const d=b[0],e=Z(b[1]);e?c+=e:a.delete(d)}return c}t.cleanup=function(){if(!this.fastupdate)return this;Z(this.map);this.depth&&Z(this.ctx);return this};
-t.searchCache=function(a,c,b){a=("object"===typeof a?""+a.query:a).toLowerCase();this.cache||(this.cache=new V);let d=this.cache.get(a);if(!d){d=this.search(a,c,b);if(d.then){const e=this;d.then(function(g){e.cache.set(a,g);return g})}this.cache.set(a,d)}return d};export default {Index:D,Charset:null,Encoder:y,Document:null,Worker:null,Resolver:null,IndexedDB:null,Language:{}};
-export const Index=D;export const Charset=null;export const Encoder=y;export const Document=null;export const Worker=null;export const Resolver=null;export const IndexedDB=null;export const Language={};
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+q.addStemmer=function(a,c){this.stemmer||(this.stemmer=new Map);this.stemmer.set(a,c);this.h+=(this.h?"|":"")+a;this.u=null;this.cache&&G(this);return this};q.addFilter=function(a){this.filter||(this.filter=new Set);this.filter.add(a);this.cache&&G(this);return this};q.addMapper=function(a,c){if("object"===typeof a)return this.addReplacer(a,c);if(1<a.length)return this.addMatcher(a,c);this.mapper||(this.mapper=new Map);this.mapper.set(a,c);this.cache&&G(this);return this};
+q.addMatcher=function(a,c){if("object"===typeof a)return this.addReplacer(a,c);if(2>a.length&&(this.dedupe||this.mapper))return this.addMapper(a,c);this.matcher||(this.matcher=new Map);this.matcher.set(a,c);this.g+=(this.g?"|":"")+a;this.s=null;this.cache&&G(this);return this};q.addReplacer=function(a,c){if("string"===typeof a)return this.addMatcher(a,c);this.replacer||(this.replacer=[]);this.replacer.push(a,c);this.cache&&G(this);return this};
+q.encode=function(a){if(this.cache&&a.length<=this.m)if(this.l){if(this.i.has(a))return this.i.get(a)}else this.l=setTimeout(G,50,this);this.normalize&&("function"===typeof this.normalize?a=this.normalize(a):a=D?a.normalize("NFKD").replace(D,"").toLowerCase():a.toLowerCase());this.prepare&&(a=this.prepare(a));this.numeric&&3<a.length&&(a=a.replace(A,"$1 $2").replace(B,"$1 $2").replace(z,"$1 "));const c=!(this.dedupe||this.mapper||this.filter||this.matcher||this.stemmer||this.replacer);let b=[],f=
+this.split||""===this.split?a.split(this.split):a;for(let g=0,e,h;g<f.length;g++)if((e=h=f[g])&&!(e.length<this.minlength))if(c)b.push(e);else if(!this.filter||!this.filter.has(e)){if(this.cache&&e.length<=this.o)if(this.l){var d=this.j.get(e);if(d||""===d){d&&b.push(d);continue}}else this.l=setTimeout(G,50,this);this.stemmer&&2<e.length&&(this.u||(this.u=new RegExp("(?!^)("+this.h+")$")),e=e.replace(this.u,k=>this.stemmer.get(k)),e.length<this.minlength||this.filter&&this.filter.has(e))&&(e="");
+if(e&&(this.mapper||this.dedupe&&1<e.length)){d="";for(let k=0,n="",m,u;k<e.length;k++)m=e.charAt(k),m===n&&this.dedupe||((u=this.mapper&&this.mapper.get(m))||""===u?u===n&&this.dedupe||!(n=u)||(d+=u):d+=n=m);e=d}this.matcher&&1<e.length&&(this.s||(this.s=new RegExp("("+this.g+")","g")),e=e.replace(this.s,k=>this.matcher.get(k)));if(e&&this.replacer)for(d=0;e&&d<this.replacer.length;d+=2)e=e.replace(this.replacer[d],this.replacer[d+1]);this.cache&&h.length<=this.o&&(this.j.set(h,e),this.j.size>this.A&&
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+I.prototype.clear=function(){this.cache.clear();this.g=""};const J={normalize:function(a){return a.toLowerCase()}};const K={memory:{resolution:1},performance:{resolution:6,fastupdate:!0,context:{depth:1,resolution:3}},match:{tokenize:"forward"},score:{resolution:9,context:{depth:2,resolution:9}}};L.prototype.add=function(a,c,b,f){if(c&&(a||0===a)){if(!f&&!b&&this.reg.has(a))return this.update(a,c);c=this.encoder.encode(c);if(f=c.length){const n=w(),m=w(),u=this.depth,C=this.resolution;for(let p=0;p<f;p++){let l=c[this.rtl?f-1-p:p];var d=l.length;if(d&&(u||!m[l])){var g=this.score?this.score(c,l,p,null,0):M(C,f,p),e="";switch(this.tokenize){case "full":if(2<d){for(g=0;g<d;g++)for(var h=d;h>g;h--){e=l.substring(g,h);var k=this.score?this.score(c,l,p,e,g):M(C,f,p,d,g);N(this,m,e,k,a,b)}break}case "reverse":if(1<
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+function N(a,c,b,f,d,g,e){let h=e?a.ctx:a.map,k;if(!c[b]||e&&!(k=c[b])[e])e?(c=k||(c[b]=w()),c[e]=1,(k=h.get(e))?h=k:h.set(e,h=new Map)):c[b]=1,(k=h.get(b))?h=k:h.set(b,h=[]),h=h[f]||(h[f]=[]),g&&h.includes(d)||(h.push(d),a.fastupdate&&((c=a.reg.get(d))?c.push(h):a.reg.set(d,[h])))}function M(a,c,b,f,d){return b&&1<a?c+(f||0)<=a?b+(d||0):(a-1)/(c+(f||0))*(b+(d||0))+1|0:0};L.prototype.search=function(a,c,b){b||(c||"object"!==typeof a?"object"===typeof c&&(b=c,c=0):(b=a,a=""));var f=[],d=0;if(b){a=b.query||a;c=b.limit||c;d=b.offset||0;var g=b.context;var e=b.suggest;var h=!0;var k=b.resolution}else h=!0;a=this.encoder.encode(a);b=a.length;c=c||(h?100:0);if(1===b)return e=d,(d=O(this,a[0],""))&&d.length?H.call(this,d,c,e):[];g=this.depth&&!1!==g;if(2===b&&g&&!e)return e=d,(d=O(this,a[0],a[1]))&&d.length?H.call(this,d,c,e):[];h=w();var n=0;if(1<b&&g){var m=a[0];n=1}k||
+0===k||(k=m?this.v:this.resolution);for(let l,v;n<b;n++){if((v=a[n])&&!h[v]){h[v]=1;l=O(this,v,m);a:{g=l;var u=f,C=e,p=k;let t=[];if(g&&g.length){if(g.length<=p){u.push(g);l=void 0;break a}for(let x=0,E;x<p;x++)if(E=g[x])t[x]=E;if(t.length){u.push(t);l=void 0;break a}}l=C?void 0:t}if(l){f=l;break}m&&(e&&l&&f.length||(m=v))}e&&m&&n===b-1&&!f.length&&(m="",n=-1,h=w())}a:{a=f;f=a.length;m=a;if(1<f)b:{f=e;m=a.length;e=[];b=w();for(let l=0,v,t,x,E;l<k;l++)for(n=0;n<m;n++)if(x=a[n],l<x.length&&(v=x[l]))for(g=
+0;g<v.length;g++)t=v[g],(h=b[t])?b[t]++:(h=0,b[t]=1),E=e[h]||(e[h]=[]),E.push(t);if(a=e.length)if(f){if(1<e.length)c:for(a=[],k=w(),f=e.length,h=f-1;0<=h;h--){if(b=(f=e[h])&&f.length)for(n=0;n<b;n++)if(m=f[n],!k[m])if(k[m]=1,d)d--;else if(a.push(m),a.length===c)break c}else a=(e=e[0]).length>c||d?e.slice(d,c+d):e;e=a}else{if(a<m){m=[];break b}e=e[a-1];if(c||d)if(e.length>c||d)e=e.slice(d,c+d)}m=e}else if(1===f){c=H.call(null,a[0],c,d);break a}c=m}return c};
+function O(a,c,b){let f;b&&(f=a.bidirectional&&c>b)&&(f=b,b=c,c=f);a=b?(a=a.ctx.get(b))&&a.get(c):a.map.get(c);return a};L.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 f=0,d;f<b.length;f++){if(d=b[f])if(2>d.length)d.pop();else{const g=d.indexOf(a);g===b.length-1?d.pop():d.splice(g,1)}}else P(this.map,a),this.depth&&P(this.ctx,a);c||this.reg.delete(a)}this.cache&&this.cache.remove(a);return this};
+function P(a,c){let b=0;if(a.constructor===Array)for(let f=0,d,g;f<a.length;f++){if((d=a[f])&&d.length)if(g=d.indexOf(c),0<=g){1<d.length?(d.splice(g,1),b++):delete a[f];break}else b++}else for(let f of a.entries()){const d=f[0],g=P(f[1],c);g?b+=g:a.delete(d)}return b};function L(a,c){if(!this||this.constructor!==L)return new L(a);if(a){var b="string"===typeof a?a:a.preset;b&&(a=Object.assign({},K[b],a))}else a={};b=a.context;const f=!0===b?{depth:1}:b||{},d=a.encode||a.encoder||J;this.encoder=d.encode?d:"object"===typeof d?new F(d):{encode:d};this.resolution=a.resolution||9;this.tokenize=(b=a.tokenize)&&"default"!==b||"strict";this.depth="strict"===b&&f.depth||0;this.bidirectional=!1!==f.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.v=f.resolution||3;this.rtl=d.rtl||a.rtl||!1;this.cache=(b=a.cache||null)&&new I(b)}q=L.prototype;q.clear=function(){this.map.clear();this.ctx.clear();this.reg.clear();this.cache&&this.cache.clear();return this};q.append=function(a,c){return this.add(a,c,!0)};q.contain=function(a){return this.reg.has(a)};q.update=function(a,c){const b=this,f=this.remove(a);return f&&f.then?f.then(()=>b.add(a,c)):this.add(a,c)};
+function Q(a){let c=0;if(a.constructor===Array)for(let b=0,f;b<a.length;b++)(f=a[b])&&(c+=f.length);else for(const b of a){const f=b[0],d=Q(b[1]);d?c+=d:a.delete(f)}return c}q.cleanup=function(){if(!this.fastupdate)return this;Q(this.map);this.depth&&Q(this.ctx);return this};
+q.searchCache=function(a,c,b){a=("object"===typeof a?""+a.query:a).toLowerCase();this.cache||(this.cache=new I);let f=this.cache.get(a);if(!f){f=this.search(a,c,b);if(f.then){const d=this;f.then(function(g){d.cache.set(a,g);return g})}this.cache.set(a,f)}return f};export default {Index:L,Charset:null,Encoder:F,Document:null,Worker:null,Resolver:null,IndexedDB:null,Language:{}};
+export const Index=L;export const Charset=null;export const Encoder=F;export const Document=null;export const Worker=null;export const Resolver=null;export const IndexedDB=null;export const Language={};
\ No newline at end of file
diff --git a/dist/module-debug/async.js b/dist/module-debug/async.js
index 8ce1ad0..1b5ac54 100644
--- a/dist/module-debug/async.js
+++ b/dist/module-debug/async.js
@@ -1,5 +1,6 @@
 import Document from "./document.js";
 import Index from "./index.js";
+import WorkerIndex from "./worker.js";
 
 export default function (prototype) {
     register.call(prototype, "add");
@@ -21,7 +22,7 @@ function tick(key) {
 
 /**
  * @param {!string} key
- * @this {Index|Document}
+ * @this {Index|Document|WorkerIndex}
  */
 
 function register(key) {
diff --git a/dist/module-debug/bundle.js b/dist/module-debug/bundle.js
index fa3752c..6767c99 100644
--- a/dist/module-debug/bundle.js
+++ b/dist/module-debug/bundle.js
@@ -138,6 +138,8 @@ import Charset from "./charset.js";
 /** @export */IndexOptions.worker; // worker url
 /** @export */IndexOptions.config; // config url
 /** @export */IndexOptions.priority;
+/** @export */IndexOptions.export;
+/** @export */IndexOptions.import;
 
 /** @export */FieldOptions.preset;
 /** @export */FieldOptions.context;
@@ -173,6 +175,8 @@ import Charset from "./charset.js";
 /** @export */DocumentOptions.document;
 /** @export */DocumentOptions.worker;
 /** @export */DocumentOptions.priority;
+/** @export */DocumentOptions.export;
+/** @export */DocumentOptions.import;
 
 /** @export */ContextOptions.depth;
 /** @export */ContextOptions.bidirectional;
diff --git a/dist/module-debug/document.js b/dist/module-debug/document.js
index 95f915f..0afdec6 100644
--- a/dist/module-debug/document.js
+++ b/dist/module-debug/document.js
@@ -42,8 +42,7 @@ export default function Document(options) {
     keystore = options.keystore || 0;
     keystore && (this.keystore = keystore);
     this.fastupdate = !!options.fastupdate;
-    this.reg = this.fastupdate ? keystore && /* tag? */ /* stringify */ /* stringify */ /* single param */ /* skip update: */ /* append: */
-    /* skip update: */ /* skip_update: */ /* skip deletion */!0 /*await rows.hasNext()*/ /*await rows.hasNext()*/ /*await rows.hasNext()*/ ? new KeystoreMap(keystore) : new Map() : keystore && !0 ? new KeystoreSet(keystore) : new Set();
+    this.reg = this.fastupdate && !options.worker && !options.db ? keystore && /* tag? */ /* stringify */ /* stringify */ /* single param */ /* skip update: */ /* append: */ /* skip update: */ /* skip_update: */ /* skip deletion */!0 /*await rows.hasNext()*/ /*await rows.hasNext()*/ /*await rows.hasNext()*/ ? new KeystoreMap(keystore) : new Map() : keystore && !0 ? new KeystoreSet(keystore) : new Set();
 
     // todo support custom filter function
     this.storetree = (tmp = document.store || null) && tmp && !0 !== tmp && [];
@@ -52,8 +51,7 @@ export default function Document(options) {
     this.cache = (tmp = options.cache || null) && new Cache(tmp);
     // do not apply cache again for the indexes since .searchCache()
     // is just a wrapper over .search()
-    options.cache = /* suggest */ /* append: */
-    /* enrich */!1;
+    options.cache = /* suggest */ /* append: */ /* enrich */!1;
 
     this.worker = options.worker;
 
@@ -105,6 +103,7 @@ export default function Document(options) {
 
     // resolve worker promises and swap instances
     if (this.worker) {
+        this.fastupdate = !1;
         const promises = [];
         for (const index of this.index.values()) {
             index.then && promises.push(index);
@@ -123,7 +122,10 @@ export default function Document(options) {
             });
         }
     } else {
-        options.db && this.mount(options.db);
+        if (options.db) {
+            this.fastupdate = !1;
+            this.mount(options.db);
+        }
     }
 }
 
@@ -132,6 +134,10 @@ export default function Document(options) {
  * @return {Promise<Array<?>>}
  */
 Document.prototype.mount = function (db) {
+    if (this.worker) {
+        throw new Error("You can't use Worker-Indexes on a persistent model. That would be useless, since each of the persistent model acts like Worker-Index by default (Master/Slave).");
+    }
+
 
     let fields = this.field;
 
diff --git a/dist/module-debug/index.js b/dist/module-debug/index.js
index dfca438..b75d50f 100644
--- a/dist/module-debug/index.js
+++ b/dist/module-debug/index.js
@@ -47,7 +47,7 @@ export default function Index(options, _register) {
 
 
     this.resolution = options.resolution || 9;
-    this.tokenize = tmp = options.tokenize || "strict";
+    this.tokenize = (tmp = options.tokenize) && "default" !== tmp || "strict";
     this.depth = "strict" === tmp && context.depth || 0;
     this.bidirectional = !1 !== context.bidirectional;
     this.fastupdate = !!options.fastupdate;
diff --git a/dist/module-debug/index/search.js b/dist/module-debug/index/search.js
index b9f773d..b9bb217 100644
--- a/dist/module-debug/index/search.js
+++ b/dist/module-debug/index/search.js
@@ -350,8 +350,6 @@ function single_term_query(term, keyword, limit, offset, resolve, enrich, tag) {
 
     const result = this.get_array(term, keyword, limit, offset, resolve, enrich, tag);
 
-    resolve = resolve;
-
     if (this.db) {
         return result.then(function (result) {
             return resolve ? result || [] : new Resolver(result);
diff --git a/dist/module-debug/type.js b/dist/module-debug/type.js
index 799b141..e32479f 100644
--- a/dist/module-debug/type.js
+++ b/dist/module-debug/type.js
@@ -21,7 +21,9 @@ import StorageInterface from "./db/interface.js";
  *   commit: (boolean|undefined),
  *   worker: (string|undefined),
  *   config: (string|undefined),
- *   priority: (number|undefined)
+ *   priority: (number|undefined),
+ *   export: (Function|undefined),
+ *   import: (Function|undefined)
  * }}
  */
 export let IndexOptions = {};
@@ -65,7 +67,9 @@ export let FieldOptions = {};
  *   doc: (DocumentDescriptor|Array<DocumentDescriptor>|undefined),
  *   document: (DocumentDescriptor|Array<DocumentDescriptor>|undefined),
  *   worker: (boolean|string|undefined),
- *   priority: (number|undefined)
+ *   priority: (number|undefined),
+ *   export: (Function|undefined),
+ *   import: (Function|undefined)
  * }}
  */
 export let DocumentOptions = {};
diff --git a/dist/module-debug/worker.js b/dist/module-debug/worker.js
index 2fc99f1..ff286dd 100644
--- a/dist/module-debug/worker.js
+++ b/dist/module-debug/worker.js
@@ -1,3 +1,4 @@
+
 import { IndexOptions } from "./type.js";
 import { create_object, is_function, is_object, is_string } from "./common.js";
 import handler from "./worker/handler.js";
@@ -97,6 +98,7 @@ register("import");
 
 apply_async(WorkerIndex.prototype);
 
+
 function register(key) {
 
     WorkerIndex.prototype[key] =
diff --git a/dist/module-debug/worker/handler.js b/dist/module-debug/worker/handler.js
index 990e152..48c286b 100644
--- a/dist/module-debug/worker/handler.js
+++ b/dist/module-debug/worker/handler.js
@@ -1,3 +1,4 @@
+
 import Index from "../index.js";
 import { IndexOptions } from "../type.js";
 
@@ -21,6 +22,7 @@ export default (async function (data) {
             options = data.options || {};
             let filepath = options.config;
             if (filepath) {
+                // compiler fix
                 options = options;
                 // will be replaced after build with the line below because
                 // there is an issue with closure compiler dynamic import
@@ -33,9 +35,7 @@ export default (async function (data) {
 
                 // export the FlexSearch global payload to "self"
                 Function("return " + factory)()(self);
-
                 index = new self.FlexSearch.Index(options);
-
                 // destroy the exported payload
                 delete self.FlexSearch;
             } else {
@@ -51,11 +51,18 @@ export default (async function (data) {
             let message;
 
             if ("export" === task) {
+                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];
             }
             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);
-                //args = [options.import];
             } else {
                 message = index[task].apply(index, args);
             }
diff --git a/dist/module-debug/worker/node.js b/dist/module-debug/worker/node.js
index 9d154eb..b31e9a0 100644
--- a/dist/module-debug/worker/node.js
+++ b/dist/module-debug/worker/node.js
@@ -29,8 +29,8 @@ parentPort.on("message", async function (data) {
 
             index = new Index(options);
             //index.db && await index.db;
-            parentPort.postMessage({ id: id });
 
+            parentPort.postMessage({ id: id });
             break;
 
         default:
@@ -38,11 +38,18 @@ parentPort.on("message", async function (data) {
             let message;
 
             if ("export" === task) {
+                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];
             }
             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);
-                //args = [options.import];
             } else {
                 message = index[task].apply(index, args);
             }
diff --git a/dist/module-min/async.js b/dist/module-min/async.js
index f2487ae..ca8a04b 100644
--- a/dist/module-min/async.js
+++ b/dist/module-min/async.js
@@ -1 +1 @@
-import Document from"./document.js";import Index from"./index.js";export default function(a){register.call(a,"add"),register.call(a,"append"),register.call(a,"search"),register.call(a,"update"),register.call(a,"remove")}let timer,timestamp;const current={},limit={};function tick(a){timer=0,current[a]=limit[a]}function register(a){this[a+"Async"]=function(){const b=arguments,c=b[b.length-1];let d;if("function"==typeof c&&(d=c,delete b[b.length-1]),timer||(timer=setTimeout(tick,0,a),timestamp=Date.now()),limit[a]||(limit[a]=current[a]=1000),! --current[a]){const c=Date.now(),d=c-timestamp,e=3*(this.priority*this.priority);current[a]=limit[a]=0|limit[a]*e/d||1,timer=clearTimeout(timer);const f=this;return new Promise(c=>{setTimeout(function(){c(f[a+"Async"].apply(f,b))},0)})}const e=this[a].apply(this,b),f=e.then?e:new Promise(a=>a(e));return d&&f.then(d),f}}
\ No newline at end of file
+import Document from"./document.js";import Index from"./index.js";import WorkerIndex from"./worker.js";export default function(a){register.call(a,"add"),register.call(a,"append"),register.call(a,"search"),register.call(a,"update"),register.call(a,"remove")}let timer,timestamp;const current={},limit={};function tick(a){timer=0,current[a]=limit[a]}function register(a){this[a+"Async"]=function(){const b=arguments,c=b[b.length-1];let d;if("function"==typeof c&&(d=c,delete b[b.length-1]),timer||(timer=setTimeout(tick,0,a),timestamp=Date.now()),limit[a]||(limit[a]=current[a]=1000),! --current[a]){const c=Date.now(),d=c-timestamp,e=3*(this.priority*this.priority);current[a]=limit[a]=0|limit[a]*e/d||1,timer=clearTimeout(timer);const f=this;return new Promise(c=>{setTimeout(function(){c(f[a+"Async"].apply(f,b))},0)})}const e=this[a].apply(this,b),f=e.then?e:new Promise(a=>a(e));return d&&f.then(d),f}}
\ No newline at end of file
diff --git a/dist/module-min/bundle.js b/dist/module-min/bundle.js
index c8ecace..b12c4b3 100644
--- a/dist/module-min/bundle.js
+++ b/dist/module-min/bundle.js
@@ -1 +1 @@
-import{SearchOptions,ContextOptions,DocumentDescriptor,DocumentSearchOptions,FieldOptions,IndexOptions,DocumentOptions,TagOptions,StoreOptions,EncoderOptions,EncoderSplitOptions,PersistentOptions,ResolverOptions}from"./type.js";import StorageInterface from"./db/interface.js";import Document from"./document.js";import Index from"./index.js";import WorkerIndex from"./worker.js";import Resolver from"./resolver.js";import Encoder from"./encoder.js";import IdxDB from"./db/indexeddb/index.js";import Charset from"./charset.js";Index.prototype.add,Index.prototype.append,Index.prototype.search,Index.prototype.update,Index.prototype.remove,Index.prototype.contain,Index.prototype.clear,Index.prototype.cleanup,Index.prototype.searchCache,Index.prototype.addAsync,Index.prototype.appendAsync,Index.prototype.searchAsync,Index.prototype.updateAsync,Index.prototype.removeAsync,Index.prototype.export,Index.prototype.import,Index.prototype.serialize,Index.prototype.mount,Index.prototype.commit,Index.prototype.destroy,Index.prototype.reg,Index.prototype.map,Index.prototype.ctx,Index.prototype.db,Index.prototype.tag,Index.prototype.store,Index.prototype.depth,Index.prototype.bidirectional,Index.prototype.commit_task,Index.prototype.commit_timer,Index.prototype.cache,Index.prototype.bypass,Index.prototype.document,Index.prototype.encoder,Encoder.prototype.assign,Encoder.prototype.encode,Encoder.prototype.addMatcher,Encoder.prototype.addStemmer,Encoder.prototype.addFilter,Encoder.prototype.addMapper,Encoder.prototype.addReplacer,Document.prototype.add,Document.prototype.append,Document.prototype.search,Document.prototype.update,Document.prototype.remove,Document.prototype.contain,Document.prototype.clear,Document.prototype.cleanup,Document.prototype.addAsync,Document.prototype.appendAsync,Document.prototype.searchAsync,Document.prototype.updateAsync,Document.prototype.removeAsync,Document.prototype.mount,Document.prototype.commit,Document.prototype.destroy,Document.prototype.export,Document.prototype.import,Document.prototype.searchCache,Document.prototype.get,Document.prototype.set,Document.prototype.field,Document.prototype.index,Document.prototype.reg,Document.prototype.tag,Document.prototype.store,Document.prototype.fastupdate,Resolver.prototype.limit,Resolver.prototype.offset,Resolver.prototype.boost,Resolver.prototype.resolve,Resolver.prototype.or,Resolver.prototype.and,Resolver.prototype.xor,Resolver.prototype.not,Resolver.prototype.result,StorageInterface.db,StorageInterface.id,StorageInterface.support_tag_search,StorageInterface.fastupdate,StorageInterface.prototype.mount,StorageInterface.prototype.open,StorageInterface.prototype.close,StorageInterface.prototype.destroy,StorageInterface.prototype.clear,StorageInterface.prototype.get,StorageInterface.prototype.tag,StorageInterface.prototype.enrich,StorageInterface.prototype.has,StorageInterface.prototype.search,StorageInterface.prototype.info,StorageInterface.prototype.commit,StorageInterface.prototype.remove,Charset.LatinExact,Charset.LatinDefault,Charset.LatinSimple,Charset.LatinBalance,Charset.LatinAdvanced,Charset.LatinExtra,Charset.LatinSoundex,Charset.ArabicDefault,Charset.CjkDefault,Charset.CyrillicDefault,IndexOptions.preset,IndexOptions.context,IndexOptions.encoder,IndexOptions.encode,IndexOptions.resolution,IndexOptions.tokenize,IndexOptions.fastupdate,IndexOptions.score,IndexOptions.keystore,IndexOptions.rtl,IndexOptions.cache,IndexOptions.resolve,IndexOptions.db,IndexOptions.worker,IndexOptions.config,IndexOptions.priority,FieldOptions.preset,FieldOptions.context,FieldOptions.encoder,FieldOptions.encode,FieldOptions.resolution,FieldOptions.tokenize,FieldOptions.fastupdate,FieldOptions.score,FieldOptions.keystore,FieldOptions.rtl,FieldOptions.cache,FieldOptions.db,FieldOptions.config,FieldOptions.resolve,FieldOptions.field,FieldOptions.filter,FieldOptions.custom,FieldOptions.worker,DocumentOptions.context,DocumentOptions.encoder,DocumentOptions.encode,DocumentOptions.resolution,DocumentOptions.tokenize,DocumentOptions.fastupdate,DocumentOptions.score,DocumentOptions.keystore,DocumentOptions.rtl,DocumentOptions.cache,DocumentOptions.db,DocumentOptions.doc,DocumentOptions.document,DocumentOptions.worker,DocumentOptions.priority,ContextOptions.depth,ContextOptions.bidirectional,ContextOptions.resolution,DocumentDescriptor.field,DocumentDescriptor.index,DocumentDescriptor.tag,DocumentDescriptor.store,TagOptions.field,TagOptions.tag,TagOptions.filter,TagOptions.custom,TagOptions.keystore,TagOptions.db,TagOptions.config,StoreOptions.field,StoreOptions.filter,StoreOptions.custom,StoreOptions.config,SearchOptions.query,SearchOptions.limit,SearchOptions.offset,SearchOptions.context,SearchOptions.suggest,SearchOptions.resolve,SearchOptions.enrich,SearchOptions.resolution,DocumentSearchOptions.query,DocumentSearchOptions.limit,DocumentSearchOptions.offset,DocumentSearchOptions.context,DocumentSearchOptions.suggest,DocumentSearchOptions.enrich,DocumentSearchOptions.tag,DocumentSearchOptions.field,DocumentSearchOptions.index,DocumentSearchOptions.pluck,DocumentSearchOptions.merge,DocumentSearchOptions.highlight,EncoderOptions.rtl,EncoderOptions.dedupe,EncoderOptions.split,EncoderOptions.include,EncoderOptions.exclude,EncoderOptions.prepare,EncoderOptions.finalize,EncoderOptions.filter,EncoderOptions.matcher,EncoderOptions.mapper,EncoderOptions.stemmer,EncoderOptions.replacer,EncoderOptions.minlength,EncoderOptions.maxlength,EncoderOptions.cache,EncoderSplitOptions.letter,EncoderSplitOptions.number,EncoderSplitOptions.symbol,EncoderSplitOptions.punctuation,EncoderSplitOptions.control,EncoderSplitOptions.char,PersistentOptions.name,PersistentOptions.field,PersistentOptions.type,PersistentOptions.db,ResolverOptions.index,ResolverOptions.query,ResolverOptions.limit,ResolverOptions.offset,ResolverOptions.enrich,ResolverOptions.resolve,ResolverOptions.suggest,ResolverOptions.and,ResolverOptions.or,ResolverOptions.xor,ResolverOptions.not;const FlexSearch={Index:Index,Charset:Charset,Encoder:Encoder,Document:Document,Worker:WorkerIndex,Resolver:Resolver,IndexedDB:IdxDB,Language:{}};{FlexSearch.Language={};const a="undefined"==typeof self?"undefined"==typeof global?"undefined"==typeof window?{}:window:global:self;let b;(b=a.define)&&b.amd?b([],function(){return FlexSearch}):"object"==typeof a.exports?a.exports=FlexSearch:a.FlexSearch=FlexSearch}export default FlexSearch;export{Index,Document,Encoder,Charset,WorkerIndex as Worker,Resolver,IdxDB as IndexedDB};
\ No newline at end of file
+import{SearchOptions,ContextOptions,DocumentDescriptor,DocumentSearchOptions,FieldOptions,IndexOptions,DocumentOptions,TagOptions,StoreOptions,EncoderOptions,EncoderSplitOptions,PersistentOptions,ResolverOptions}from"./type.js";import StorageInterface from"./db/interface.js";import Document from"./document.js";import Index from"./index.js";import WorkerIndex from"./worker.js";import Resolver from"./resolver.js";import Encoder from"./encoder.js";import IdxDB from"./db/indexeddb/index.js";import Charset from"./charset.js";Index.prototype.add,Index.prototype.append,Index.prototype.search,Index.prototype.update,Index.prototype.remove,Index.prototype.contain,Index.prototype.clear,Index.prototype.cleanup,Index.prototype.searchCache,Index.prototype.addAsync,Index.prototype.appendAsync,Index.prototype.searchAsync,Index.prototype.updateAsync,Index.prototype.removeAsync,Index.prototype.export,Index.prototype.import,Index.prototype.serialize,Index.prototype.mount,Index.prototype.commit,Index.prototype.destroy,Index.prototype.reg,Index.prototype.map,Index.prototype.ctx,Index.prototype.db,Index.prototype.tag,Index.prototype.store,Index.prototype.depth,Index.prototype.bidirectional,Index.prototype.commit_task,Index.prototype.commit_timer,Index.prototype.cache,Index.prototype.bypass,Index.prototype.document,Index.prototype.encoder,Encoder.prototype.assign,Encoder.prototype.encode,Encoder.prototype.addMatcher,Encoder.prototype.addStemmer,Encoder.prototype.addFilter,Encoder.prototype.addMapper,Encoder.prototype.addReplacer,Document.prototype.add,Document.prototype.append,Document.prototype.search,Document.prototype.update,Document.prototype.remove,Document.prototype.contain,Document.prototype.clear,Document.prototype.cleanup,Document.prototype.addAsync,Document.prototype.appendAsync,Document.prototype.searchAsync,Document.prototype.updateAsync,Document.prototype.removeAsync,Document.prototype.mount,Document.prototype.commit,Document.prototype.destroy,Document.prototype.export,Document.prototype.import,Document.prototype.searchCache,Document.prototype.get,Document.prototype.set,Document.prototype.field,Document.prototype.index,Document.prototype.reg,Document.prototype.tag,Document.prototype.store,Document.prototype.fastupdate,Resolver.prototype.limit,Resolver.prototype.offset,Resolver.prototype.boost,Resolver.prototype.resolve,Resolver.prototype.or,Resolver.prototype.and,Resolver.prototype.xor,Resolver.prototype.not,Resolver.prototype.result,StorageInterface.db,StorageInterface.id,StorageInterface.support_tag_search,StorageInterface.fastupdate,StorageInterface.prototype.mount,StorageInterface.prototype.open,StorageInterface.prototype.close,StorageInterface.prototype.destroy,StorageInterface.prototype.clear,StorageInterface.prototype.get,StorageInterface.prototype.tag,StorageInterface.prototype.enrich,StorageInterface.prototype.has,StorageInterface.prototype.search,StorageInterface.prototype.info,StorageInterface.prototype.commit,StorageInterface.prototype.remove,Charset.LatinExact,Charset.LatinDefault,Charset.LatinSimple,Charset.LatinBalance,Charset.LatinAdvanced,Charset.LatinExtra,Charset.LatinSoundex,Charset.ArabicDefault,Charset.CjkDefault,Charset.CyrillicDefault,IndexOptions.preset,IndexOptions.context,IndexOptions.encoder,IndexOptions.encode,IndexOptions.resolution,IndexOptions.tokenize,IndexOptions.fastupdate,IndexOptions.score,IndexOptions.keystore,IndexOptions.rtl,IndexOptions.cache,IndexOptions.resolve,IndexOptions.db,IndexOptions.worker,IndexOptions.config,IndexOptions.priority,IndexOptions.export,IndexOptions.import,FieldOptions.preset,FieldOptions.context,FieldOptions.encoder,FieldOptions.encode,FieldOptions.resolution,FieldOptions.tokenize,FieldOptions.fastupdate,FieldOptions.score,FieldOptions.keystore,FieldOptions.rtl,FieldOptions.cache,FieldOptions.db,FieldOptions.config,FieldOptions.resolve,FieldOptions.field,FieldOptions.filter,FieldOptions.custom,FieldOptions.worker,DocumentOptions.context,DocumentOptions.encoder,DocumentOptions.encode,DocumentOptions.resolution,DocumentOptions.tokenize,DocumentOptions.fastupdate,DocumentOptions.score,DocumentOptions.keystore,DocumentOptions.rtl,DocumentOptions.cache,DocumentOptions.db,DocumentOptions.doc,DocumentOptions.document,DocumentOptions.worker,DocumentOptions.priority,DocumentOptions.export,DocumentOptions.import,ContextOptions.depth,ContextOptions.bidirectional,ContextOptions.resolution,DocumentDescriptor.field,DocumentDescriptor.index,DocumentDescriptor.tag,DocumentDescriptor.store,TagOptions.field,TagOptions.tag,TagOptions.filter,TagOptions.custom,TagOptions.keystore,TagOptions.db,TagOptions.config,StoreOptions.field,StoreOptions.filter,StoreOptions.custom,StoreOptions.config,SearchOptions.query,SearchOptions.limit,SearchOptions.offset,SearchOptions.context,SearchOptions.suggest,SearchOptions.resolve,SearchOptions.enrich,SearchOptions.resolution,DocumentSearchOptions.query,DocumentSearchOptions.limit,DocumentSearchOptions.offset,DocumentSearchOptions.context,DocumentSearchOptions.suggest,DocumentSearchOptions.enrich,DocumentSearchOptions.tag,DocumentSearchOptions.field,DocumentSearchOptions.index,DocumentSearchOptions.pluck,DocumentSearchOptions.merge,DocumentSearchOptions.highlight,EncoderOptions.rtl,EncoderOptions.dedupe,EncoderOptions.split,EncoderOptions.include,EncoderOptions.exclude,EncoderOptions.prepare,EncoderOptions.finalize,EncoderOptions.filter,EncoderOptions.matcher,EncoderOptions.mapper,EncoderOptions.stemmer,EncoderOptions.replacer,EncoderOptions.minlength,EncoderOptions.maxlength,EncoderOptions.cache,EncoderSplitOptions.letter,EncoderSplitOptions.number,EncoderSplitOptions.symbol,EncoderSplitOptions.punctuation,EncoderSplitOptions.control,EncoderSplitOptions.char,PersistentOptions.name,PersistentOptions.field,PersistentOptions.type,PersistentOptions.db,ResolverOptions.index,ResolverOptions.query,ResolverOptions.limit,ResolverOptions.offset,ResolverOptions.enrich,ResolverOptions.resolve,ResolverOptions.suggest,ResolverOptions.and,ResolverOptions.or,ResolverOptions.xor,ResolverOptions.not;const FlexSearch={Index:Index,Charset:Charset,Encoder:Encoder,Document:Document,Worker:WorkerIndex,Resolver:Resolver,IndexedDB:IdxDB,Language:{}};{FlexSearch.Language={};const a="undefined"==typeof self?"undefined"==typeof global?"undefined"==typeof window?{}:window:global:self;let b;(b=a.define)&&b.amd?b([],function(){return FlexSearch}):"object"==typeof a.exports?a.exports=FlexSearch:a.FlexSearch=FlexSearch}export default FlexSearch;export{Index,Document,Encoder,Charset,WorkerIndex as Worker,Resolver,IdxDB as IndexedDB};
\ No newline at end of file
diff --git a/dist/module-min/document.js b/dist/module-min/document.js
index 59ad0a4..cd0528e 100644
--- a/dist/module-min/document.js
+++ b/dist/module-min/document.js
@@ -1 +1 @@
-import{IndexOptions,DocumentOptions,DocumentDescriptor,FieldOptions,StoreOptions}from"./type.js";import StorageInterface from"./db/interface.js";import Index from"./index.js";import WorkerIndex from"./worker.js";import Cache,{searchCache}from"./cache.js";import{is_string,is_object,parse_simple}from"./common.js";import apply_async from"./async.js";import{exportDocument,importDocument}from"./serialize.js";import{KeystoreMap,KeystoreSet}from"./keystore.js";import"./document/add.js";import"./document/search.js";export default function Document(a){if(!this||this.constructor!==Document)return new Document(a);const b=a.document||a.doc||a;let c,d;if(this.tree=[],this.field=[],this.marker=[],this.key=(c=b.key||b.id)&&parse_tree(c,this.marker)||"id",d=a.keystore||0,d&&(this.keystore=d),this.fastupdate=!!a.fastupdate,this.reg=this.fastupdate?d&&!0?new KeystoreMap(d):new Map:d&&!0?new KeystoreSet(d):new Set,this.storetree=(c=b.store||null)&&c&&!0!==c&&[],this.store=c&&(d&&!0?new KeystoreMap(d):new Map),this.cache=(c=a.cache||null)&&new Cache(c),a.cache=!1,this.worker=a.worker,this.index=parse_descriptor.call(this,a,b),(this.tag=null,(c=b.tag)&&("string"==typeof c&&(c=[c]),c.length))){this.tag=new Map,this.tagtree=[],this.tagfield=[];for(let a,b,d=0;d<c.length;d++){if(a=c[d],b=a.field||a,!b)throw new Error("The tag field from the document descriptor is undefined.");a.custom?this.tagtree[d]=a.custom:(this.tagtree[d]=parse_tree(b,this.marker),a.filter&&("string"==typeof this.tagtree[d]&&(this.tagtree[d]=new String(this.tagtree[d])),this.tagtree[d]._filter=a.filter)),this.tagfield[d]=b,this.tag.set(b,new Map)}}if(this.worker){const a=[];for(const b of this.index.values())b.then&&a.push(b);if(a.length){const b=this;return Promise.all(a).then(function(a){let c=0;for(const d of b.index.entries()){const e=d[0],f=d[1];f.then&&b.index.set(e,a[c++])}return b})}}else a.db&&this.mount(a.db)}Document.prototype.mount=function(a){let b=this.field;if(this.tag)for(let a,c=0;c<this.tagfield.length;c++){a=this.tagfield[c];let d;this.index.set(a,d=new Index({},this.reg)),b===this.field&&(b=b.slice(0)),b.push(a),d.tag=this.tag.get(a)}const c=[],d={db:a.db,type:a.type,fastupdate:a.fastupdate};for(let e,f,g=0;g<b.length;g++){d.field=f=b[g],e=this.index.get(f);const h=new a.constructor(a.id,d);h.id=a.id,c[g]=h.mount(e),e.document=!0,g?e.bypass=!0:e.store=this.store}return this.db=!0,Promise.all(c)},Document.prototype.commit=async function(a,b){const c=[];for(const d of this.index.values())c.push(d.db.commit(d,a,b));await Promise.all(c),this.reg.clear()},Document.prototype.destroy=function(){const a=[];for(const b of this.index.values())a.push(b.destroy());return Promise.all(a)};function parse_descriptor(a,b){const c=new Map;let d=b.index||b.field||b;is_string(d)&&(d=[d]);for(let e,f,g=0;g<d.length;g++){if(e=d[g],is_string(e)||(f=e,e=e.field),f=is_object(f)?Object.assign({},a,f):a,this.worker){const a=new WorkerIndex(f);a?c.set(e,a):this.worker=!1}this.worker||c.set(e,new Index(f,this.reg)),f.custom?this.tree[g]=f.custom:(this.tree[g]=parse_tree(e,this.marker),f.filter&&("string"==typeof this.tree[g]&&(this.tree[g]=new String(this.tree[g])),this.tree[g]._filter=f.filter)),this.field[g]=e}if(this.storetree){let a=b.store;is_string(a)&&(a=[a]);for(let b,c,d=0;d<a.length;d++)b=a[d],c=b.field||b,b.custom?(this.storetree[d]=b.custom,b.custom._field=c):(this.storetree[d]=parse_tree(c,this.marker),b.filter&&("string"==typeof this.storetree[d]&&(this.storetree[d]=new String(this.storetree[d])),this.storetree[d]._filter=b.filter))}return c}function parse_tree(a,b){const c=a.split(":");let d=0;for(let e=0;e<c.length;e++)a=c[e],"]"===a[a.length-1]&&(a=a.substring(0,a.length-2),a&&(b[d]=!0)),a&&(c[d++]=a);return d<c.length&&(c.length=d),1<d?c:c[0]}Document.prototype.append=function(a,b){return this.add(a,b,!0)},Document.prototype.update=function(a,b){return this.remove(a).add(a,b)},Document.prototype.remove=function(a){is_object(a)&&(a=parse_simple(a,this.key));for(const b of this.index.values())b.remove(a,!0);if(this.reg.has(a)){if(this.tag&&!this.fastupdate)for(let b of this.tag.values())for(let c of b){const d=c[0],e=c[1],f=e.indexOf(a);-1<f&&(1<e.length?e.splice(f,1):b.delete(d))}this.store&&this.store.delete(a),this.reg.delete(a)}return this.cache&&this.cache.remove(a),this},Document.prototype.clear=function(){for(const a of this.index.values())a.clear();if(this.tag)for(const a of this.tag.values())a.clear();return this.store&&this.store.clear(),this},Document.prototype.contain=function(a){return this.db?this.index.get(this.field[0]).db.has(a):this.reg.has(a)},Document.prototype.cleanup=function(){for(const a of this.index.values())a.cleanup();return this},Document.prototype.get=function(a){return this.db?this.index.get(this.field[0]).db.enrich(a).then(function(a){return a[0]&&a[0].doc}):this.store.get(a)},Document.prototype.set=function(a,b){return this.store.set(a,b),this},Document.prototype.searchCache=searchCache,Document.prototype.export=exportDocument,Document.prototype.import=importDocument,apply_async(Document.prototype);
\ No newline at end of file
+import{IndexOptions,DocumentOptions,DocumentDescriptor,FieldOptions,StoreOptions}from"./type.js";import StorageInterface from"./db/interface.js";import Index from"./index.js";import WorkerIndex from"./worker.js";import Cache,{searchCache}from"./cache.js";import{is_string,is_object,parse_simple}from"./common.js";import apply_async from"./async.js";import{exportDocument,importDocument}from"./serialize.js";import{KeystoreMap,KeystoreSet}from"./keystore.js";import"./document/add.js";import"./document/search.js";export default function Document(a){if(!this||this.constructor!==Document)return new Document(a);const b=a.document||a.doc||a;let c,d;if(this.tree=[],this.field=[],this.marker=[],this.key=(c=b.key||b.id)&&parse_tree(c,this.marker)||"id",d=a.keystore||0,d&&(this.keystore=d),this.fastupdate=!!a.fastupdate,this.reg=!this.fastupdate||a.worker||a.db?d&&!0?new KeystoreSet(d):new Set:d&&!0?new KeystoreMap(d):new Map,this.storetree=(c=b.store||null)&&c&&!0!==c&&[],this.store=c&&(d&&!0?new KeystoreMap(d):new Map),this.cache=(c=a.cache||null)&&new Cache(c),a.cache=!1,this.worker=a.worker,this.index=parse_descriptor.call(this,a,b),(this.tag=null,(c=b.tag)&&("string"==typeof c&&(c=[c]),c.length))){this.tag=new Map,this.tagtree=[],this.tagfield=[];for(let a,b,d=0;d<c.length;d++){if(a=c[d],b=a.field||a,!b)throw new Error("The tag field from the document descriptor is undefined.");a.custom?this.tagtree[d]=a.custom:(this.tagtree[d]=parse_tree(b,this.marker),a.filter&&("string"==typeof this.tagtree[d]&&(this.tagtree[d]=new String(this.tagtree[d])),this.tagtree[d]._filter=a.filter)),this.tagfield[d]=b,this.tag.set(b,new Map)}}if(this.worker){this.fastupdate=!1;const a=[];for(const b of this.index.values())b.then&&a.push(b);if(a.length){const b=this;return Promise.all(a).then(function(a){let c=0;for(const d of b.index.entries()){const e=d[0],f=d[1];f.then&&b.index.set(e,a[c++])}return b})}}else a.db&&(this.fastupdate=!1,this.mount(a.db))}Document.prototype.mount=function(a){let b=this.field;if(this.tag)for(let a,c=0;c<this.tagfield.length;c++){a=this.tagfield[c];let d;this.index.set(a,d=new Index({},this.reg)),b===this.field&&(b=b.slice(0)),b.push(a),d.tag=this.tag.get(a)}const c=[],d={db:a.db,type:a.type,fastupdate:a.fastupdate};for(let e,f,g=0;g<b.length;g++){d.field=f=b[g],e=this.index.get(f);const h=new a.constructor(a.id,d);h.id=a.id,c[g]=h.mount(e),e.document=!0,g?e.bypass=!0:e.store=this.store}return this.db=!0,Promise.all(c)},Document.prototype.commit=async function(a,b){const c=[];for(const d of this.index.values())c.push(d.db.commit(d,a,b));await Promise.all(c),this.reg.clear()},Document.prototype.destroy=function(){const a=[];for(const b of this.index.values())a.push(b.destroy());return Promise.all(a)};function parse_descriptor(a,b){const c=new Map;let d=b.index||b.field||b;is_string(d)&&(d=[d]);for(let e,f,g=0;g<d.length;g++){if(e=d[g],is_string(e)||(f=e,e=e.field),f=is_object(f)?Object.assign({},a,f):a,this.worker){const a=new WorkerIndex(f);a?c.set(e,a):this.worker=!1}this.worker||c.set(e,new Index(f,this.reg)),f.custom?this.tree[g]=f.custom:(this.tree[g]=parse_tree(e,this.marker),f.filter&&("string"==typeof this.tree[g]&&(this.tree[g]=new String(this.tree[g])),this.tree[g]._filter=f.filter)),this.field[g]=e}if(this.storetree){let a=b.store;is_string(a)&&(a=[a]);for(let b,c,d=0;d<a.length;d++)b=a[d],c=b.field||b,b.custom?(this.storetree[d]=b.custom,b.custom._field=c):(this.storetree[d]=parse_tree(c,this.marker),b.filter&&("string"==typeof this.storetree[d]&&(this.storetree[d]=new String(this.storetree[d])),this.storetree[d]._filter=b.filter))}return c}function parse_tree(a,b){const c=a.split(":");let d=0;for(let e=0;e<c.length;e++)a=c[e],"]"===a[a.length-1]&&(a=a.substring(0,a.length-2),a&&(b[d]=!0)),a&&(c[d++]=a);return d<c.length&&(c.length=d),1<d?c:c[0]}Document.prototype.append=function(a,b){return this.add(a,b,!0)},Document.prototype.update=function(a,b){return this.remove(a).add(a,b)},Document.prototype.remove=function(a){is_object(a)&&(a=parse_simple(a,this.key));for(const b of this.index.values())b.remove(a,!0);if(this.reg.has(a)){if(this.tag&&!this.fastupdate)for(let b of this.tag.values())for(let c of b){const d=c[0],e=c[1],f=e.indexOf(a);-1<f&&(1<e.length?e.splice(f,1):b.delete(d))}this.store&&this.store.delete(a),this.reg.delete(a)}return this.cache&&this.cache.remove(a),this},Document.prototype.clear=function(){for(const a of this.index.values())a.clear();if(this.tag)for(const a of this.tag.values())a.clear();return this.store&&this.store.clear(),this},Document.prototype.contain=function(a){return this.db?this.index.get(this.field[0]).db.has(a):this.reg.has(a)},Document.prototype.cleanup=function(){for(const a of this.index.values())a.cleanup();return this},Document.prototype.get=function(a){return this.db?this.index.get(this.field[0]).db.enrich(a).then(function(a){return a[0]&&a[0].doc}):this.store.get(a)},Document.prototype.set=function(a,b){return this.store.set(a,b),this},Document.prototype.searchCache=searchCache,Document.prototype.export=exportDocument,Document.prototype.import=importDocument,apply_async(Document.prototype);
\ No newline at end of file
diff --git a/dist/module-min/index.js b/dist/module-min/index.js
index 844aff3..142fc82 100644
--- a/dist/module-min/index.js
+++ b/dist/module-min/index.js
@@ -1 +1 @@
-import{IndexOptions,ContextOptions,EncoderOptions}from"./type.js";import Encoder from"./encoder.js";import Cache,{searchCache}from"./cache.js";import Charset from"./charset.js";import{KeystoreMap,KeystoreSet}from"./keystore.js";import{is_array,is_string}from"./common.js";import{exportIndex,importIndex,serialize}from"./serialize.js";import default_encoder from"./charset/latin/default.js";import apply_preset from"./preset.js";import apply_async from"./async.js";import tick from"./profiler.js";import"./index/add.js";import"./index/search.js";import"./index/remove.js";export default function Index(a,b){if(!this||this.constructor!==Index)return new Index(a);!1,a=a?apply_preset(a):{};let c=a.context;const d=!0===c?{depth:1}:c||{},e=is_string(a.encoder)?Charset[a.encoder]:a.encode||a.encoder||default_encoder;this.encoder=e.encode?e:"object"==typeof e?new Encoder(e):{encode:e},this.compress=a.compress||a.compression||!1,this.resolution=a.resolution||9,this.tokenize=c=a.tokenize||"strict",this.depth="strict"===c&&d.depth||0,this.bidirectional=!1!==d.bidirectional,this.fastupdate=!!a.fastupdate,this.score=a.score||null,c=a.keystore||0,c&&(this.keystore=c),this.map=c&&!0?new KeystoreMap(c):new Map,this.ctx=c&&!0?new KeystoreMap(c):new Map,this.reg=b||(this.fastupdate?c&&!0?new KeystoreMap(c):new Map:c&&!0?new KeystoreSet(c):new Set),this.resolution_ctx=d.resolution||3,this.rtl=e.rtl||a.rtl||!1,this.cache=(c=a.cache||null)&&new Cache(c),this.resolve=!1!==a.resolve,(c=a.db)&&(this.db=this.mount(c)),this.commit_auto=!1!==a.commit,this.commit_task=[],this.commit_timer=null,this.priority=a.priority||4}Index.prototype.mount=function(a){return this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null),a.mount(this)},Index.prototype.commit=function(a,b){return this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null),this.db.commit(this,a,b)},Index.prototype.destroy=function(){return this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null),this.db.destroy()};export function autoCommit(a,b,c){a.commit_timer||(a.commit_timer=setTimeout(function(){a.commit_timer=null,a.db.commit(a,b,c)},0))}Index.prototype.clear=function(){return this.map.clear(),this.ctx.clear(),this.reg.clear(),this.cache&&this.cache.clear(),this.db&&(this.commit_timer&&clearTimeout(this.commit_timer),this.commit_timer=null,this.commit_task=[{clear:!0}]),this},Index.prototype.append=function(a,b){return this.add(a,b,!0)},Index.prototype.contain=function(a){return this.db?this.db.has(a):this.reg.has(a)},Index.prototype.update=function(a,b){const c=this,d=this.remove(a);return d&&d.then?d.then(()=>c.add(a,b)):this.add(a,b)};function cleanup_index(a){let b=0;if(is_array(a))for(let c,d=0;d<a.length;d++)(c=a[d])&&(b+=c.length);else for(const c of a){const d=c[0],e=c[1],f=cleanup_index(e);f?b+=f:a.delete(d)}return b}Index.prototype.cleanup=function(){return this.fastupdate?(cleanup_index(this.map),this.depth&&cleanup_index(this.ctx),this):(!1,this)},Index.prototype.searchCache=searchCache,Index.prototype.export=exportIndex,Index.prototype.import=importIndex,Index.prototype.serialize=serialize,apply_async(Index.prototype);
\ No newline at end of file
+import{IndexOptions,ContextOptions,EncoderOptions}from"./type.js";import Encoder from"./encoder.js";import Cache,{searchCache}from"./cache.js";import Charset from"./charset.js";import{KeystoreMap,KeystoreSet}from"./keystore.js";import{is_array,is_string}from"./common.js";import{exportIndex,importIndex,serialize}from"./serialize.js";import default_encoder from"./charset/latin/default.js";import apply_preset from"./preset.js";import apply_async from"./async.js";import tick from"./profiler.js";import"./index/add.js";import"./index/search.js";import"./index/remove.js";export default function Index(a,b){if(!this||this.constructor!==Index)return new Index(a);!1,a=a?apply_preset(a):{};let c=a.context;const d=!0===c?{depth:1}:c||{},e=is_string(a.encoder)?Charset[a.encoder]:a.encode||a.encoder||default_encoder;this.encoder=e.encode?e:"object"==typeof e?new Encoder(e):{encode:e},this.compress=a.compress||a.compression||!1,this.resolution=a.resolution||9,this.tokenize=(c=a.tokenize)&&"default"!==c||"strict",this.depth="strict"===c&&d.depth||0,this.bidirectional=!1!==d.bidirectional,this.fastupdate=!!a.fastupdate,this.score=a.score||null,c=a.keystore||0,c&&(this.keystore=c),this.map=c&&!0?new KeystoreMap(c):new Map,this.ctx=c&&!0?new KeystoreMap(c):new Map,this.reg=b||(this.fastupdate?c&&!0?new KeystoreMap(c):new Map:c&&!0?new KeystoreSet(c):new Set),this.resolution_ctx=d.resolution||3,this.rtl=e.rtl||a.rtl||!1,this.cache=(c=a.cache||null)&&new Cache(c),this.resolve=!1!==a.resolve,(c=a.db)&&(this.db=this.mount(c)),this.commit_auto=!1!==a.commit,this.commit_task=[],this.commit_timer=null,this.priority=a.priority||4}Index.prototype.mount=function(a){return this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null),a.mount(this)},Index.prototype.commit=function(a,b){return this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null),this.db.commit(this,a,b)},Index.prototype.destroy=function(){return this.commit_timer&&(clearTimeout(this.commit_timer),this.commit_timer=null),this.db.destroy()};export function autoCommit(a,b,c){a.commit_timer||(a.commit_timer=setTimeout(function(){a.commit_timer=null,a.db.commit(a,b,c)},0))}Index.prototype.clear=function(){return this.map.clear(),this.ctx.clear(),this.reg.clear(),this.cache&&this.cache.clear(),this.db&&(this.commit_timer&&clearTimeout(this.commit_timer),this.commit_timer=null,this.commit_task=[{clear:!0}]),this},Index.prototype.append=function(a,b){return this.add(a,b,!0)},Index.prototype.contain=function(a){return this.db?this.db.has(a):this.reg.has(a)},Index.prototype.update=function(a,b){const c=this,d=this.remove(a);return d&&d.then?d.then(()=>c.add(a,b)):this.add(a,b)};function cleanup_index(a){let b=0;if(is_array(a))for(let c,d=0;d<a.length;d++)(c=a[d])&&(b+=c.length);else for(const c of a){const d=c[0],e=c[1],f=cleanup_index(e);f?b+=f:a.delete(d)}return b}Index.prototype.cleanup=function(){return this.fastupdate?(cleanup_index(this.map),this.depth&&cleanup_index(this.ctx),this):(!1,this)},Index.prototype.searchCache=searchCache,Index.prototype.export=exportIndex,Index.prototype.import=importIndex,Index.prototype.serialize=serialize,apply_async(Index.prototype);
\ No newline at end of file
diff --git a/dist/module-min/index/search.js b/dist/module-min/index/search.js
index 8930047..f26f745 100644
--- a/dist/module-min/index/search.js
+++ b/dist/module-min/index/search.js
@@ -1 +1 @@
-import{SearchOptions,SearchResults,EnrichedSearchResults,IntermediateSearchResults}from"../type.js";import{create_object,is_object,sort_by_length_down}from"../common.js";import Index from"../index.js";import default_compress from"../compress.js";import Resolver from"../resolver.js";import{intersect}from"../intersect.js";import resolve_default from"../resolve/default.js";Index.prototype.search=function(a,b,c){c||(!b&&is_object(a)?(c=a,a=""):is_object(b)&&(c=b,b=0));let d,e,f,g,h,i,j,k,l=[],m=0;c?(a=c.query||a,b=c.limit||b,m=c.offset||0,e=c.context,f=c.suggest,g=!1!==c.resolve,k=g&&c.enrich,i=c.boost,j=c.resolution,h=this.db&&c.tag):g=this.resolve;let n=this.encoder.encode(a);if(d=n.length,b=b||(g?100:0),1===d)return single_term_query.call(this,n[0],"",b,m,g,k,h);if(e=this.depth&&!1!==e,2===d&&e&&!f)return single_term_query.call(this,n[0],n[1],b,m,g,k,h);let o,p=create_object(),q=0;if(1<d&&e&&(o=n[0],q=1),j||0===j||(j=o?this.resolution_ctx:this.resolution),this.db){if(this.db.search){const a=this.db.search(this,n,b,m,f,g,k,h);if(!1!==a)return a}const a=this;return async function(){for(let b,c;q<d;q++){if(c=n[q],c&&!p[c]){if(p[c]=1,b=await a.get_array(c,o,0,0,!1,!1),b=add_result(b,l,f,j),b){l=b;break}!o||f&&b&&l.length||(o=c)}f&&o&&q==d-1&&!l.length&&(o="",q=-1,p=create_object())}return return_result(l,j,b,m,f,i,g)}()}for(let e,g;q<d;q++){if(g=n[q],g&&!p[g]){if(p[g]=1,e=this.get_array(g,o,0,0,!1,!1),e=add_result(e,l,f,j),e){l=e;break}!o||f&&e&&l.length||(o=g)}f&&o&&q==d-1&&!l.length&&(o="",q=-1,p=create_object())}return return_result(l,j,b,m,f,i,g)};function return_result(a,b,c,d,e,f,g){let h=a.length,i=a;if(1<h)i=intersect(a,b,c,d,e,f,g);else if(1===h)return g?resolve_default.call(null,a[0],c,d):new Resolver(a[0]);return g?i:new Resolver(i)}function single_term_query(a,b,c,d,e,f,g){const h=this.get_array(a,b,c,d,e,f,g);return e=e,this.db?h.then(function(a){return e?a||[]:new Resolver(a)}):h&&h.length?e?resolve_default.call(this,h,c,d):new Resolver(h):e?[]:new Resolver}function add_result(a,b,c,d){let e=[];if(a&&a.length){if(a.length<=d)return void b.push(a);for(let b,c=0;c<d;c++)(b=a[c])&&(e[c]=b);if(e.length)return void b.push(e)}return c?void 0:e}Index.prototype.get_array=function(a,b,c,d,e,f,g){let h,i;return(b&&(i=this.bidirectional&&a>b,i&&(i=b,b=a,a=i)),this.compress&&(a=default_compress(a),b&&(b=default_compress(b))),this.db)?this.db.get(a,b,c,d,e,f,g):(b?(h=this.ctx.get(b),h=h&&h.get(a)):h=this.map.get(a),h)};
\ No newline at end of file
+import{SearchOptions,SearchResults,EnrichedSearchResults,IntermediateSearchResults}from"../type.js";import{create_object,is_object,sort_by_length_down}from"../common.js";import Index from"../index.js";import default_compress from"../compress.js";import Resolver from"../resolver.js";import{intersect}from"../intersect.js";import resolve_default from"../resolve/default.js";Index.prototype.search=function(a,b,c){c||(!b&&is_object(a)?(c=a,a=""):is_object(b)&&(c=b,b=0));let d,e,f,g,h,i,j,k,l=[],m=0;c?(a=c.query||a,b=c.limit||b,m=c.offset||0,e=c.context,f=c.suggest,g=!1!==c.resolve,k=g&&c.enrich,i=c.boost,j=c.resolution,h=this.db&&c.tag):g=this.resolve;let n=this.encoder.encode(a);if(d=n.length,b=b||(g?100:0),1===d)return single_term_query.call(this,n[0],"",b,m,g,k,h);if(e=this.depth&&!1!==e,2===d&&e&&!f)return single_term_query.call(this,n[0],n[1],b,m,g,k,h);let o,p=create_object(),q=0;if(1<d&&e&&(o=n[0],q=1),j||0===j||(j=o?this.resolution_ctx:this.resolution),this.db){if(this.db.search){const a=this.db.search(this,n,b,m,f,g,k,h);if(!1!==a)return a}const a=this;return async function(){for(let b,c;q<d;q++){if(c=n[q],c&&!p[c]){if(p[c]=1,b=await a.get_array(c,o,0,0,!1,!1),b=add_result(b,l,f,j),b){l=b;break}!o||f&&b&&l.length||(o=c)}f&&o&&q==d-1&&!l.length&&(o="",q=-1,p=create_object())}return return_result(l,j,b,m,f,i,g)}()}for(let e,g;q<d;q++){if(g=n[q],g&&!p[g]){if(p[g]=1,e=this.get_array(g,o,0,0,!1,!1),e=add_result(e,l,f,j),e){l=e;break}!o||f&&e&&l.length||(o=g)}f&&o&&q==d-1&&!l.length&&(o="",q=-1,p=create_object())}return return_result(l,j,b,m,f,i,g)};function return_result(a,b,c,d,e,f,g){let h=a.length,i=a;if(1<h)i=intersect(a,b,c,d,e,f,g);else if(1===h)return g?resolve_default.call(null,a[0],c,d):new Resolver(a[0]);return g?i:new Resolver(i)}function single_term_query(a,b,c,d,e,f,g){const h=this.get_array(a,b,c,d,e,f,g);return this.db?h.then(function(a){return e?a||[]:new Resolver(a)}):h&&h.length?e?resolve_default.call(this,h,c,d):new Resolver(h):e?[]:new Resolver}function add_result(a,b,c,d){let e=[];if(a&&a.length){if(a.length<=d)return void b.push(a);for(let b,c=0;c<d;c++)(b=a[c])&&(e[c]=b);if(e.length)return void b.push(e)}return c?void 0:e}Index.prototype.get_array=function(a,b,c,d,e,f,g){let h,i;return(b&&(i=this.bidirectional&&a>b,i&&(i=b,b=a,a=i)),this.compress&&(a=default_compress(a),b&&(b=default_compress(b))),this.db)?this.db.get(a,b,c,d,e,f,g):(b?(h=this.ctx.get(b),h=h&&h.get(a)):h=this.map.get(a),h)};
\ No newline at end of file
diff --git a/dist/module-min/worker/handler.js b/dist/module-min/worker/handler.js
index df303f1..9a84022 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),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;"export"===b&&(d=[options.export]);"import"===b?await options.import.call(index,index):g=index[b].apply(index,d);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 10913b8..6d7a4fd 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;"export"===b&&(d=[options.export]),"import"===b?await options.import.call(index,index):f=index[b].apply(index,d),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;"export"===b&&(d=[options.export]);"import"===b?await options.import.call(index,index):f=index[b].apply(index,d);parentPort.postMessage("search"===b?{id:c,msg:f}:{id:c});}});
\ No newline at end of file
diff --git a/dist/module/async.js b/dist/module/async.js
index 8ce1ad0..1b5ac54 100644
--- a/dist/module/async.js
+++ b/dist/module/async.js
@@ -1,5 +1,6 @@
 import Document from "./document.js";
 import Index from "./index.js";
+import WorkerIndex from "./worker.js";
 
 export default function (prototype) {
     register.call(prototype, "add");
@@ -21,7 +22,7 @@ function tick(key) {
 
 /**
  * @param {!string} key
- * @this {Index|Document}
+ * @this {Index|Document|WorkerIndex}
  */
 
 function register(key) {
diff --git a/dist/module/bundle.js b/dist/module/bundle.js
index fa3752c..6767c99 100644
--- a/dist/module/bundle.js
+++ b/dist/module/bundle.js
@@ -138,6 +138,8 @@ import Charset from "./charset.js";
 /** @export */IndexOptions.worker; // worker url
 /** @export */IndexOptions.config; // config url
 /** @export */IndexOptions.priority;
+/** @export */IndexOptions.export;
+/** @export */IndexOptions.import;
 
 /** @export */FieldOptions.preset;
 /** @export */FieldOptions.context;
@@ -173,6 +175,8 @@ import Charset from "./charset.js";
 /** @export */DocumentOptions.document;
 /** @export */DocumentOptions.worker;
 /** @export */DocumentOptions.priority;
+/** @export */DocumentOptions.export;
+/** @export */DocumentOptions.import;
 
 /** @export */ContextOptions.depth;
 /** @export */ContextOptions.bidirectional;
diff --git a/dist/module/document.js b/dist/module/document.js
index 95f915f..4248511 100644
--- a/dist/module/document.js
+++ b/dist/module/document.js
@@ -42,8 +42,7 @@ export default function Document(options) {
     keystore = options.keystore || 0;
     keystore && (this.keystore = keystore);
     this.fastupdate = !!options.fastupdate;
-    this.reg = this.fastupdate ? keystore && /* tag? */ /* stringify */ /* stringify */ /* single param */ /* skip update: */ /* append: */
-    /* skip update: */ /* skip_update: */ /* skip deletion */!0 /*await rows.hasNext()*/ /*await rows.hasNext()*/ /*await rows.hasNext()*/ ? new KeystoreMap(keystore) : new Map() : keystore && !0 ? new KeystoreSet(keystore) : new Set();
+    this.reg = this.fastupdate && !options.worker && !options.db ? keystore && /* tag? */ /* stringify */ /* stringify */ /* single param */ /* skip update: */ /* append: */ /* skip update: */ /* skip_update: */ /* skip deletion */!0 /*await rows.hasNext()*/ /*await rows.hasNext()*/ /*await rows.hasNext()*/ ? new KeystoreMap(keystore) : new Map() : keystore && !0 ? new KeystoreSet(keystore) : new Set();
 
     // todo support custom filter function
     this.storetree = (tmp = document.store || null) && tmp && !0 !== tmp && [];
@@ -52,8 +51,7 @@ export default function Document(options) {
     this.cache = (tmp = options.cache || null) && new Cache(tmp);
     // do not apply cache again for the indexes since .searchCache()
     // is just a wrapper over .search()
-    options.cache = /* suggest */ /* append: */
-    /* enrich */!1;
+    options.cache = /* suggest */ /* append: */ /* enrich */!1;
 
     this.worker = options.worker;
 
@@ -105,6 +103,7 @@ export default function Document(options) {
 
     // resolve worker promises and swap instances
     if (this.worker) {
+        this.fastupdate = !1;
         const promises = [];
         for (const index of this.index.values()) {
             index.then && promises.push(index);
@@ -123,7 +122,10 @@ export default function Document(options) {
             });
         }
     } else {
-        options.db && this.mount(options.db);
+        if (options.db) {
+            this.fastupdate = !1;
+            this.mount(options.db);
+        }
     }
 }
 
diff --git a/dist/module/index.js b/dist/module/index.js
index 61d8de7..9e2e0eb 100644
--- a/dist/module/index.js
+++ b/dist/module/index.js
@@ -47,7 +47,7 @@ export default function Index(options, _register) {
 
 
     this.resolution = options.resolution || 9;
-    this.tokenize = tmp = options.tokenize || "strict";
+    this.tokenize = (tmp = options.tokenize) && "default" !== tmp || "strict";
     this.depth = "strict" === tmp && context.depth || 0;
     this.bidirectional = !1 !== context.bidirectional;
     this.fastupdate = !!options.fastupdate;
diff --git a/dist/module/index/search.js b/dist/module/index/search.js
index b9f773d..b9bb217 100644
--- a/dist/module/index/search.js
+++ b/dist/module/index/search.js
@@ -350,8 +350,6 @@ function single_term_query(term, keyword, limit, offset, resolve, enrich, tag) {
 
     const result = this.get_array(term, keyword, limit, offset, resolve, enrich, tag);
 
-    resolve = resolve;
-
     if (this.db) {
         return result.then(function (result) {
             return resolve ? result || [] : new Resolver(result);
diff --git a/dist/module/type.js b/dist/module/type.js
index 799b141..e32479f 100644
--- a/dist/module/type.js
+++ b/dist/module/type.js
@@ -21,7 +21,9 @@ import StorageInterface from "./db/interface.js";
  *   commit: (boolean|undefined),
  *   worker: (string|undefined),
  *   config: (string|undefined),
- *   priority: (number|undefined)
+ *   priority: (number|undefined),
+ *   export: (Function|undefined),
+ *   import: (Function|undefined)
  * }}
  */
 export let IndexOptions = {};
@@ -65,7 +67,9 @@ export let FieldOptions = {};
  *   doc: (DocumentDescriptor|Array<DocumentDescriptor>|undefined),
  *   document: (DocumentDescriptor|Array<DocumentDescriptor>|undefined),
  *   worker: (boolean|string|undefined),
- *   priority: (number|undefined)
+ *   priority: (number|undefined),
+ *   export: (Function|undefined),
+ *   import: (Function|undefined)
  * }}
  */
 export let DocumentOptions = {};
diff --git a/dist/module/worker.js b/dist/module/worker.js
index 2fc99f1..ff286dd 100644
--- a/dist/module/worker.js
+++ b/dist/module/worker.js
@@ -1,3 +1,4 @@
+
 import { IndexOptions } from "./type.js";
 import { create_object, is_function, is_object, is_string } from "./common.js";
 import handler from "./worker/handler.js";
@@ -97,6 +98,7 @@ register("import");
 
 apply_async(WorkerIndex.prototype);
 
+
 function register(key) {
 
     WorkerIndex.prototype[key] =
diff --git a/dist/module/worker/handler.js b/dist/module/worker/handler.js
index 990e152..42feacc 100644
--- a/dist/module/worker/handler.js
+++ b/dist/module/worker/handler.js
@@ -1,3 +1,4 @@
+
 import Index from "../index.js";
 import { IndexOptions } from "../type.js";
 
@@ -21,6 +22,7 @@ export default (async function (data) {
             options = data.options || {};
             let filepath = options.config;
             if (filepath) {
+                // compiler fix
                 options = options;
                 // will be replaced after build with the line below because
                 // there is an issue with closure compiler dynamic import
@@ -33,9 +35,7 @@ export default (async function (data) {
 
                 // export the FlexSearch global payload to "self"
                 Function("return " + factory)()(self);
-
                 index = new self.FlexSearch.Index(options);
-
                 // destroy the exported payload
                 delete self.FlexSearch;
             } else {
@@ -55,7 +55,6 @@ export default (async function (data) {
             }
             if ("import" === task) {
                 await options.import.call(index, index);
-                //args = [options.import];
             } else {
                 message = index[task].apply(index, args);
             }
diff --git a/dist/module/worker/node.js b/dist/module/worker/node.js
index 9d154eb..1602804 100644
--- a/dist/module/worker/node.js
+++ b/dist/module/worker/node.js
@@ -29,8 +29,8 @@ parentPort.on("message", async function (data) {
 
             index = new Index(options);
             //index.db && await index.db;
-            parentPort.postMessage({ id: id });
 
+            parentPort.postMessage({ id: id });
             break;
 
         default:
@@ -42,7 +42,6 @@ parentPort.on("message", async function (data) {
             }
             if ("import" === task) {
                 await options.import.call(index, index);
-                //args = [options.import];
             } else {
                 message = index[task].apply(index, args);
             }
diff --git a/dist/node/node.js b/dist/node/node.js
index dc3f76b..6ad967c 100644
--- a/dist/node/node.js
+++ b/dist/node/node.js
@@ -1,3 +1,6 @@
+// COMPILER BLOCK -->
+import { DEBUG } from "../config.js";
+// <-- COMPILER BLOCK
 const { parentPort } = require("worker_threads");
 //const { join } = require("path");
 // Test Path
@@ -29,8 +32,8 @@ parentPort.on("message", async function(data){
 
             index = new Index(options);
             //index.db && await index.db;
-            parentPort.postMessage({ "id": id });
 
+            parentPort.postMessage({ "id": id });
             break;
 
         default:
@@ -38,11 +41,20 @@ parentPort.on("message", async function(data){
             let message;
 
             if(task === "export"){
+                if(DEBUG){
+                    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];
             }
             if(task === "import"){
+                if(DEBUG){
+                    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);
-                //args = [options.import];
             }
             else{
                 message = index[task].apply(index, args);
diff --git a/dist/node/node.mjs b/dist/node/node.mjs
index 12eda37..fc79cbb 100644
--- a/dist/node/node.mjs
+++ b/dist/node/node.mjs
@@ -1,3 +1,6 @@
+// COMPILER BLOCK -->
+import { DEBUG } from "../config.js";
+// <-- COMPILER BLOCK
 import { parentPort } from "worker_threads";
 import { join } from "path";
 // Test Path
@@ -31,8 +34,8 @@ parentPort.on("message", async function(data){
 
             index = new Index(options);
             //index.db && await index.db;
-            parentPort.postMessage({ "id": id });
 
+            parentPort.postMessage({ "id": id });
             break;
 
         default:
@@ -40,11 +43,20 @@ parentPort.on("message", async function(data){
             let message;
 
             if(task === "export"){
+                if(DEBUG){
+                    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];
             }
             if(task === "import"){
+                if(DEBUG){
+                    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);
-                //args = [options.import];
             }
             else{
                 message = index[task].apply(index, args);
diff --git a/example/nodejs-commonjs/basic-export-import/index.js b/example/nodejs-commonjs/basic-export-import/index.js
index 58b125f..1ceb239 100644
--- a/example/nodejs-commonjs/basic-export-import/index.js
+++ b/example/nodejs-commonjs/basic-export-import/index.js
@@ -59,7 +59,7 @@ const { Index } = require("flexsearch");
     const files = await fs.readdir("./export/");
     await Promise.all(files.map(async file => {
         const data = await fs.readFile("./export/" + file, "utf8");
-        await index.import(file, data);
+        index.import(file, data);
     }));
 
     // perform query
diff --git a/example/nodejs-commonjs/basic-worker-export-import/index.js b/example/nodejs-commonjs/basic-worker-export-import/index.js
index 5997146..966c04e 100644
--- a/example/nodejs-commonjs/basic-worker-export-import/index.js
+++ b/example/nodejs-commonjs/basic-worker-export-import/index.js
@@ -1,13 +1,18 @@
 const { Worker: WorkerIndex } = require("flexsearch");
 
+// 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 = {
+    tokenize: "forward",
+    config: __dirname + "/config.js"
+};
+
 (async function(){
 
     // create a simple index which can store id-content-pairs
     // and await (!) for the worker response
-    let index = await new WorkerIndex({
-        tokenize: "forward",
-        config: __dirname + "/config.js"
-    });
+    let index = await new WorkerIndex(config);
 
     // some test data
     const data = [
@@ -39,19 +44,16 @@ const { Worker: WorkerIndex } = require("flexsearch");
     // EXPORT
     // -----------------------
 
-    await index.export(function(){
-        // do nothing here
-    });
-
-    index = await new WorkerIndex({
-        tokenize: "forward",
-        config: __dirname + "/config.js"
-    });
+    await index.export();
 
     // -----------------------
     // IMPORT
     // -----------------------
 
+    // create the same type of index you have used by .export()
+    // along with the same configuration
+    index = await new WorkerIndex(config);
+
     await index.import();
 
     // perform query
diff --git a/example/nodejs-esm/basic-export-import/index.js b/example/nodejs-esm/basic-export-import/index.js
index aeed3ca..744c906 100644
--- a/example/nodejs-esm/basic-export-import/index.js
+++ b/example/nodejs-esm/basic-export-import/index.js
@@ -34,6 +34,7 @@ result.forEach(i => {
     console.log(data[i]);
 });
 
+// -----------------------
 // EXPORT
 // -----------------------
 
@@ -44,6 +45,7 @@ await index.export(async function(key, data){
     await fs.writeFile("./export/" + key, data, "utf8");
 });
 
+// -----------------------
 // IMPORT
 // -----------------------
 
@@ -55,7 +57,7 @@ index = new Index(config);
 const files = await fs.readdir("./export/");
 await Promise.all(files.map(async file => {
     const data = await fs.readFile("./export/" + file, "utf8");
-    await index.import(file, data);
+    index.import(file, data);
 }))
 
 // perform query
diff --git a/example/nodejs-esm/basic-worker-export-import/index.js b/example/nodejs-esm/basic-worker-export-import/index.js
index 271f13c..eafd40d 100644
--- a/example/nodejs-esm/basic-worker-export-import/index.js
+++ b/example/nodejs-esm/basic-worker-export-import/index.js
@@ -1,14 +1,19 @@
 import { Worker as WorkerIndex } from "flexsearch/esm";
 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 = {
+    tokenize: "forward",
+    config: dirname + "/config.js"
+};
+
 (async function(){
 
     // create a simple index which can store id-content-pairs
     // and await (!) for the worker response
-    let index = await new WorkerIndex({
-        tokenize: "forward",
-        config: dirname + "/config.js"
-    });
+    let index = await new WorkerIndex(config);
 
     // some test data
     const data = [
@@ -44,15 +49,14 @@ const dirname = import.meta.dirname;
         // do nothing here
     });
 
-    index = await new WorkerIndex({
-        tokenize: "forward",
-        config: dirname + "/config.js"
-    });
-
     // -----------------------
     // IMPORT
     // -----------------------
 
+    // create the same type of index you have used by .export()
+    // along with the same configuration
+    index = await new WorkerIndex(config);
+
     await index.import();
 
     // perform query
diff --git a/index.d.ts b/index.d.ts
index 8625632..f2b513e 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -38,7 +38,8 @@ declare module "flexsearch" {
         | "strict"
         | "forward"
         | "reverse"
-        | "full";
+        | "full"
+        | "default";
 
     /**
      * **Document:**
@@ -187,12 +188,14 @@ declare module "flexsearch" {
 
         // Language-specific Options and Encoding
         encoder?: Charset | Encoders | EncoderOptions;
-        encode?: ((x: string) => string[]),
+        encode?: (text: string) => string[],
         rtl?: boolean;
     };
 
     type WorkerIndexOptions = IndexOptions & {
         config?: WorkerConfigURL | WorkerConfigPath,
+        export?: () => Promise<void>;
+        import?: () => Promise<void>;
         db: null,
         commit: null
     };
@@ -297,6 +300,8 @@ declare module "flexsearch" {
 
     export class Worker extends Index {
         constructor(options?: Preset | WorkerIndexOptions);
+        export(): Promise<void>;
+        import(): Promise<void>;
     }
 
     /************************************/
@@ -520,7 +525,7 @@ declare module "flexsearch" {
     type PersistentOptions = {
         name?: string;
         type?: IdType;
-        db?: StorageInterface;
+        db?: any;
     };
 
     type DefaultResolve = {
@@ -560,7 +565,7 @@ declare module "flexsearch" {
         result: IntermediateSearchResults
     }
 
-    export class StorageInterface {
+    class StorageInterface {
         constructor(name: string, config: PersistentOptions);
         constructor(config: string | PersistentOptions);
         mount(index: Index | Document) : Promise<void>;
@@ -570,4 +575,8 @@ declare module "flexsearch" {
         clear() : Promise<void>;
         db: any;
     }
+
+    export class IndexedDB extends StorageInterface{
+        db: IDBDatabase
+    }
 }
diff --git a/package-lock.json b/package-lock.json
index 074291a..784dead 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "flexsearch",
-  "version": "0.8.108",
+  "version": "0.8.109",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "flexsearch",
-      "version": "0.8.108",
+      "version": "0.8.109",
       "funding": [
         {
           "type": "github",
@@ -1701,17 +1701,24 @@
       }
     },
     "node_modules/glob": {
-      "version": "7.1.2",
-      "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.2.tgz",
-      "integrity": "sha512-MJTUg1kjuLeQCJ+ccE4Vpa6kKVXkPYJ2mOCQyUuKLcLQsdrMCpBPUi8qVE6+YuaJkozeA9NusTAw3hLr8Xe5EQ==",
+      "version": "7.2.3",
+      "resolved": "https://registry.npmjs.org/glob/-/glob-7.2.3.tgz",
+      "integrity": "sha512-nFR0zLpU2YCaRxwoCJvL6UvCH2JFyFVIvwTLsIf21AuHlMskA1hhTdk+LlYJtOlYt9v6dvszD2BGRqBL+iQK9Q==",
+      "deprecated": "Glob versions prior to v9 are no longer supported",
       "dev": true,
       "dependencies": {
         "fs.realpath": "^1.0.0",
         "inflight": "^1.0.4",
         "inherits": "2",
-        "minimatch": "^3.0.4",
+        "minimatch": "^3.1.1",
         "once": "^1.3.0",
         "path-is-absolute": "^1.0.0"
+      },
+      "engines": {
+        "node": "*"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
       }
     },
     "node_modules/glob-base": {
@@ -2279,12 +2286,15 @@
       }
     },
     "node_modules/minimatch": {
-      "version": "3.0.4",
-      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.0.4.tgz",
-      "integrity": "sha512-yJHVQEhyqPLUTgt9B83PXu6W3rx4MvvHvSUvToogpwoGDOUQ+yDrR0HRot+yOCdCO7u4hX3pWft6kWBBcqh0UA==",
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.2.tgz",
+      "integrity": "sha512-J7p63hRiAjw1NDEww1W7i37+ByIrOWO5XQQAzZ3VOcL0PNybwpfmV/N05zFAzwQ9USyEcX6t3UO+K5aqBQOIHw==",
       "dev": true,
       "dependencies": {
         "brace-expansion": "^1.1.7"
+      },
+      "engines": {
+        "node": "*"
       }
     },
     "node_modules/minimist": {
@@ -4819,15 +4829,15 @@
       "optional": true
     },
     "glob": {
-      "version": "7.1.2",
-      "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.2.tgz",
-      "integrity": "sha512-MJTUg1kjuLeQCJ+ccE4Vpa6kKVXkPYJ2mOCQyUuKLcLQsdrMCpBPUi8qVE6+YuaJkozeA9NusTAw3hLr8Xe5EQ==",
+      "version": "7.2.3",
+      "resolved": "https://registry.npmjs.org/glob/-/glob-7.2.3.tgz",
+      "integrity": "sha512-nFR0zLpU2YCaRxwoCJvL6UvCH2JFyFVIvwTLsIf21AuHlMskA1hhTdk+LlYJtOlYt9v6dvszD2BGRqBL+iQK9Q==",
       "dev": true,
       "requires": {
         "fs.realpath": "^1.0.0",
         "inflight": "^1.0.4",
         "inherits": "2",
-        "minimatch": "^3.0.4",
+        "minimatch": "^3.1.1",
         "once": "^1.3.0",
         "path-is-absolute": "^1.0.0"
       }
@@ -5272,9 +5282,9 @@
       }
     },
     "minimatch": {
-      "version": "3.0.4",
-      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.0.4.tgz",
-      "integrity": "sha512-yJHVQEhyqPLUTgt9B83PXu6W3rx4MvvHvSUvToogpwoGDOUQ+yDrR0HRot+yOCdCO7u4hX3pWft6kWBBcqh0UA==",
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.1.2.tgz",
+      "integrity": "sha512-J7p63hRiAjw1NDEww1W7i37+ByIrOWO5XQQAzZ3VOcL0PNybwpfmV/N05zFAzwQ9USyEcX6t3UO+K5aqBQOIHw==",
       "dev": true,
       "requires": {
         "brace-expansion": "^1.1.7"
diff --git a/package.json b/package.json
index ed9fa6a..0a744df 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "public": true,
   "preferGlobal": false,
   "name": "flexsearch",
-  "version": "0.8.108",
+  "version": "0.8.109",
   "description": "Next-Generation full-text search library for Browser and Node.js",
   "homepage": "https://github.com/nextapps-de/flexsearch/",
   "author": "Thomas Wilkerling",
diff --git a/src/async.js b/src/async.js
index bf7dc29..af366e3 100644
--- a/src/async.js
+++ b/src/async.js
@@ -1,5 +1,6 @@
 import Document from "./document.js";
 import Index from "./index.js";
+import WorkerIndex from "./worker.js";
 
 export default function(prototype){
     register.call(prototype, "add");
@@ -21,7 +22,7 @@ function tick(key){
 
 /**
  * @param {!string} key
- * @this {Index|Document}
+ * @this {Index|Document|WorkerIndex}
  */
 
 function register(key){
diff --git a/src/bundle.js b/src/bundle.js
index 85a24e2..79385b9 100644
--- a/src/bundle.js
+++ b/src/bundle.js
@@ -169,6 +169,8 @@ if(SUPPORT_SERIALIZE){
 /** @export */ IndexOptions.worker; // worker url
 /** @export */ IndexOptions.config; // config url
 /** @export */ IndexOptions.priority;
+/** @export */ IndexOptions.export;
+/** @export */ IndexOptions.import;
 
 /** @export */ FieldOptions.preset;
 /** @export */ FieldOptions.context;
@@ -204,6 +206,8 @@ if(SUPPORT_SERIALIZE){
 /** @export */ DocumentOptions.document;
 /** @export */ DocumentOptions.worker;
 /** @export */ DocumentOptions.priority;
+/** @export */ DocumentOptions.export;
+/** @export */ DocumentOptions.import;
 
 /** @export */ ContextOptions.depth;
 /** @export */ ContextOptions.bidirectional;
diff --git a/src/config.js b/src/config.js
index 24d6904..0782c7f 100644
--- a/src/config.js
+++ b/src/config.js
@@ -5,7 +5,7 @@ export const RELEASE = "custom";
 export const DEBUG = true;
 
 /** @define {boolean} */
-export const PROFILER = true;
+export const PROFILER = false;
 
 /** @define {boolean} */
 export const POLYFILL = false;
diff --git a/src/document.js b/src/document.js
index b5e1c1b..dc5335a 100644
--- a/src/document.js
+++ b/src/document.js
@@ -58,7 +58,7 @@ export default function Document(options){
     keystore = SUPPORT_KEYSTORE && (options.keystore || 0);
     keystore && (this.keystore = keystore);
     this.fastupdate = !!options.fastupdate;
-    this.reg = this.fastupdate
+    this.reg = this.fastupdate && (!SUPPORT_WORKER || !options.worker) && (!SUPPORT_PERSISTENT || !options.db)
         ? (keystore && SUPPORT_KEYSTORE ? new KeystoreMap(keystore) : new Map())
         : (keystore && SUPPORT_KEYSTORE ? new KeystoreSet(keystore) : new Set());
 
@@ -134,6 +134,7 @@ export default function Document(options){
 
     // resolve worker promises and swap instances
     if(SUPPORT_WORKER && this.worker){
+        this.fastupdate = false;
         const promises = [];
         for(const index of this.index.values()){
             index.then && promises.push(index);
@@ -152,7 +153,10 @@ export default function Document(options){
         }
     }
     else if(SUPPORT_PERSISTENT){
-        options.db && this.mount(options.db);
+        if(options.db){
+            this.fastupdate = false;
+            this.mount(options.db);
+        }
     }
 }
 
@@ -164,6 +168,12 @@ if(SUPPORT_PERSISTENT){
      */
     Document.prototype.mount = function(db){
 
+        if(DEBUG){
+            if(this.worker){
+                throw new Error("You can't use Worker-Indexes on a persistent model. That would be useless, since each of the persistent model acts like Worker-Index by default (Master/Slave).")
+            }
+        }
+
         let fields = this.field;
 
         if(SUPPORT_TAGS && this.tag){
diff --git a/src/index.js b/src/index.js
index c9a7d26..0efa6ac 100644
--- a/src/index.js
+++ b/src/index.js
@@ -83,7 +83,7 @@ export default function Index(options, _register){
     }
 
     this.resolution = options.resolution || 9;
-    this.tokenize = tmp = options.tokenize || "strict";
+    this.tokenize = ((tmp = options.tokenize) && tmp !== "default") || "strict";
     this.depth = (tmp === "strict" && context.depth) || 0;
     this.bidirectional = context.bidirectional !== false;
     this.fastupdate = !!options.fastupdate;
diff --git a/src/index/search.js b/src/index/search.js
index 9f4b5e0..967d426 100644
--- a/src/index/search.js
+++ b/src/index/search.js
@@ -413,22 +413,20 @@ function single_term_query(term, keyword, limit, offset, resolve, enrich, tag){
         tag
     );
 
-    resolve = !SUPPORT_RESOLVER || resolve;
-
     if(SUPPORT_PERSISTENT && this.db){
         return result.then(function(result){
-            return resolve
+            return !SUPPORT_RESOLVER || resolve
                 ? result || []
                 : new Resolver(result);
         });
     }
 
     return result && result.length
-        ? (resolve
+        ? (!SUPPORT_RESOLVER || resolve
             ? resolve_default.call(this, /** @type {SearchResults|EnrichedSearchResults} */ (result), limit, offset)
             : new Resolver(result)
         )
-        : resolve
+        : !SUPPORT_RESOLVER || resolve
             ? []
             : new Resolver();
 }
diff --git a/src/intersect.js b/src/intersect.js
index 62b72b4..f596838 100644
--- a/src/intersect.js
+++ b/src/intersect.js
@@ -252,7 +252,7 @@ export function intersect_union(arrays, mandatory, resolve) {
         }
     }
 
-    if(resolve){
+    if(!SUPPORT_RESOLVER || resolve){
         for(let i = 0, id; i < arrays.length; i++){
             id = arrays[i];
             if(check[id]){
diff --git a/src/type.js b/src/type.js
index d343c8d..3816e96 100644
--- a/src/type.js
+++ b/src/type.js
@@ -21,7 +21,9 @@ import StorageInterface from "./db/interface.js";
  *   commit: (boolean|undefined),
  *   worker: (string|undefined),
  *   config: (string|undefined),
- *   priority: (number|undefined)
+ *   priority: (number|undefined),
+ *   export: (Function|undefined),
+ *   import: (Function|undefined)
  * }}
  */
 export let IndexOptions = {};
@@ -65,7 +67,9 @@ export let FieldOptions = {};
  *   doc: (DocumentDescriptor|Array<DocumentDescriptor>|undefined),
  *   document: (DocumentDescriptor|Array<DocumentDescriptor>|undefined),
  *   worker: (boolean|string|undefined),
- *   priority: (number|undefined)
+ *   priority: (number|undefined),
+ *   export: (Function|undefined),
+ *   import: (Function|undefined)
  * }}
  */
 export let DocumentOptions = {};
diff --git a/src/worker.js b/src/worker.js
index c5fac26..14ae6bf 100644
--- a/src/worker.js
+++ b/src/worker.js
@@ -1,3 +1,6 @@
+// COMPILER BLOCK -->
+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 handler from "./worker/handler.js";
@@ -102,7 +105,9 @@ register("clear");
 register("export");
 register("import");
 
-apply_async(WorkerIndex.prototype);
+if(SUPPORT_ASYNC){
+    apply_async(WorkerIndex.prototype);
+}
 
 function register(key){
 
diff --git a/src/worker/handler.js b/src/worker/handler.js
index 0f4f7c0..4e420da 100644
--- a/src/worker/handler.js
+++ b/src/worker/handler.js
@@ -1,3 +1,6 @@
+// COMPILER BLOCK -->
+import { DEBUG } from "../config.js";
+// <-- COMPILER BLOCK
 import Index from "../index.js";
 import { IndexOptions } from "../type.js";
 
@@ -21,6 +24,7 @@ export default async function(data) {
             options = data["options"] || {};
             let filepath = options.config;
             if(filepath){
+                // compiler fix
                 options = options;
                 // will be replaced after build with the line below because
                 // there is an issue with closure compiler dynamic import
@@ -33,9 +37,7 @@ export default async function(data) {
 
                 // export the FlexSearch global payload to "self"
                 Function("return " + factory)()(self);
-
                 index = new self["FlexSearch"]["Index"](options);
-
                 // destroy the exported payload
                 delete self["FlexSearch"];
             }
@@ -52,11 +54,20 @@ export default async function(data) {
             let message;
 
             if(task === "export"){
+                if(DEBUG){
+                    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];
             }
             if(task === "import"){
+                if(DEBUG){
+                    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);
-                //args = [options.import];
             }
             else{
                 message = index[task].apply(index, args);
diff --git a/src/worker/node.js b/src/worker/node.js
index dc3f76b..6ad967c 100644
--- a/src/worker/node.js
+++ b/src/worker/node.js
@@ -1,3 +1,6 @@
+// COMPILER BLOCK -->
+import { DEBUG } from "../config.js";
+// <-- COMPILER BLOCK
 const { parentPort } = require("worker_threads");
 //const { join } = require("path");
 // Test Path
@@ -29,8 +32,8 @@ parentPort.on("message", async function(data){
 
             index = new Index(options);
             //index.db && await index.db;
-            parentPort.postMessage({ "id": id });
 
+            parentPort.postMessage({ "id": id });
             break;
 
         default:
@@ -38,11 +41,20 @@ parentPort.on("message", async function(data){
             let message;
 
             if(task === "export"){
+                if(DEBUG){
+                    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];
             }
             if(task === "import"){
+                if(DEBUG){
+                    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);
-                //args = [options.import];
             }
             else{
                 message = index[task].apply(index, args);
diff --git a/src/worker/node.mjs b/src/worker/node.mjs
index 12eda37..fc79cbb 100644
--- a/src/worker/node.mjs
+++ b/src/worker/node.mjs
@@ -1,3 +1,6 @@
+// COMPILER BLOCK -->
+import { DEBUG } from "../config.js";
+// <-- COMPILER BLOCK
 import { parentPort } from "worker_threads";
 import { join } from "path";
 // Test Path
@@ -31,8 +34,8 @@ parentPort.on("message", async function(data){
 
             index = new Index(options);
             //index.db && await index.db;
-            parentPort.postMessage({ "id": id });
 
+            parentPort.postMessage({ "id": id });
             break;
 
         default:
@@ -40,11 +43,20 @@ parentPort.on("message", async function(data){
             let message;
 
             if(task === "export"){
+                if(DEBUG){
+                    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];
             }
             if(task === "import"){
+                if(DEBUG){
+                    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);
-                //args = [options.import];
             }
             else{
                 message = index[task].apply(index, args);