diff --git a/dist/flexsearch.bundle.debug.js b/dist/flexsearch.bundle.debug.js
index 1cb5654..42e27c7 100644
--- a/dist/flexsearch.bundle.debug.js
+++ b/dist/flexsearch.bundle.debug.js
@@ -499,18 +499,18 @@ O.prototype.add = function(a, b, c, d) {
     b = this.encoder.encode(b);
     if (d = b.length) {
       const l = z(), m = z(), n = this.depth, q = this.resolution;
-      for (let t = 0; t < d; t++) {
-        let p = b[this.rtl ? d - 1 - t : t];
+      for (let r = 0; r < d; r++) {
+        let p = b[this.rtl ? d - 1 - r : r];
         var e = p.length;
         if (e && (n || !m[p])) {
-          var f = this.score ? this.score(b, p, t, null, 0) : P(q, d, t), g = "";
+          var f = this.score ? this.score(b, p, r, null, 0) : P(q, d, r), g = "";
           switch(this.tokenize) {
             case "full":
               if (2 < e) {
                 for (f = 0; f < e; f++) {
                   for (var h = e; h > f; h--) {
                     g = p.substring(f, h);
-                    var k = this.score ? this.score(b, p, t, g, f) : P(q, d, t, e, f);
+                    var k = this.score ? this.score(b, p, r, g, f) : P(q, d, r, e, f);
                     Q(this, m, g, k, a, c);
                   }
                 }
@@ -519,7 +519,7 @@ O.prototype.add = function(a, b, c, d) {
             case "reverse":
               if (1 < e) {
                 for (h = e - 1; 0 < h; h--) {
-                  g = p[h] + g, k = this.score ? this.score(b, p, t, g, h) : P(q, d, t, e, h), Q(this, m, g, k, a, c);
+                  g = p[h] + g, k = this.score ? this.score(b, p, r, g, h) : P(q, d, r, e, h), Q(this, m, g, k, a, c);
                 }
                 g = "";
               }
@@ -531,12 +531,12 @@ O.prototype.add = function(a, b, c, d) {
                 break;
               }
             default:
-              if (Q(this, m, p, f, a, c), n && 1 < d && t < d - 1) {
-                for (e = z(), g = this.U, f = p, h = Math.min(n + 1, d - t), e[f] = 1, k = 1; k < h; k++) {
-                  if ((p = b[this.rtl ? d - 1 - t - k : t + k]) && !e[p]) {
+              if (Q(this, m, p, f, a, c), n && 1 < d && r < d - 1) {
+                for (e = z(), g = this.U, f = p, h = Math.min(n + 1, d - r), e[f] = 1, k = 1; k < h; k++) {
+                  if ((p = b[this.rtl ? d - 1 - r - k : r + k]) && !e[p]) {
                     e[p] = 1;
-                    const r = this.score ? this.score(b, f, t, p, k) : P(g + (d / 2 > g ? 0 : 1), d, t, h - 1, k - 1), x = this.bidirectional && p > f;
-                    Q(this, l, x ? f : p, r, a, c, x ? p : f);
+                    const t = this.score ? this.score(b, f, r, p, k) : P(g + (d / 2 > g ? 0 : 1), d, r, h - 1, k - 1), x = this.bidirectional && p > f;
+                    Q(this, l, x ? f : p, t, a, c, x ? p : f);
                   }
                 }
               }
@@ -678,17 +678,17 @@ function Ea(a, b, c, d, e, f) {
     for (let n = 0, q; n < a.length; n++) {
       if (q = a[n]) {
         if (m = q[l]) {
-          for (let t = 0, p; t < m.length; t++) {
-            if (p = m[t], !h[p]) {
+          for (let r = 0, p; r < m.length; r++) {
+            if (p = m[r], !h[p]) {
               if (h[p] = 1, c) {
                 c--;
               } else {
                 if (e) {
                   d.push(p);
                 } else {
-                  const r = l + (n ? f : 0);
-                  d[r] || (d[r] = []);
-                  d[r].push(p);
+                  const t = l + (n ? f : 0);
+                  d[t] || (d[t] = []);
+                  d[t].push(p);
                 }
                 if (b && ++g === b) {
                   return d;
@@ -769,13 +769,13 @@ function Fa(a, b, c, d, e) {
     if (!m || !m.length) {
       return [];
     }
-    let n = z(), q = 0, t = l === a.length - 1;
-    for (let p = 0, r; p < k; p++) {
-      if (r = m[p]) {
-        for (let x = 0, A, w; x < r.length; x++) {
-          if (A = r[x], !l) {
+    let n = z(), q = 0, r = l === a.length - 1;
+    for (let p = 0, t; p < k; p++) {
+      if (t = m[p]) {
+        for (let x = 0, A, w; x < t.length; x++) {
+          if (A = t[x], !l) {
             n[A] = p + 1 + (l ? e : 0), q = 1;
-          } else if (t) {
+          } else if (r) {
             if (w = h[A]) {
               if (q = 1, c) {
                 c--;
@@ -997,14 +997,13 @@ S.prototype.resolve = function(a, b, c) {
   return d.length ? ("object" === typeof a && (c = a.enrich, b = a.offset, a = a.limit), R(d, a || 100, b, c)) : d;
 };
 function Ia(a, b, c, d, e) {
-  const f = a.length;
-  let g = [], h, k;
-  h = z();
-  for (let l = 0, m, n, q, t; l < b; l++) {
-    for (let p = 0; p < f; p++) {
-      if (q = a[p], l < q.length && (m = q[l])) {
-        for (let r = 0; r < m.length; r++) {
-          n = m[r], (k = h[n]) ? h[n]++ : (k = 0, h[n] = 1), t = g[k] || (g[k] = []), t.push(n);
+  var f = a.length, g = [], h;
+  var k = z();
+  for (let n = 0, q, r, p, t; n < b; n++) {
+    for (var l = 0; l < f; l++) {
+      if (p = a[l], n < p.length && (q = p[n])) {
+        for (var m = 0; m < q.length; m++) {
+          r = q[m], (h = k[r]) ? k[r]++ : (h = 0, k[r] = 1), t = g[h] || (g[h] = []), t.push(r);
         }
       }
     }
@@ -1012,21 +1011,43 @@ function Ia(a, b, c, d, e) {
   if (a = g.length) {
     if (e) {
       e = [];
-      for (let l = a - 1, m = 0, n, q; 0 <= l; l--) {
-        if (n = g[l], q = n.length, d >= q) {
-          d -= q;
+      for (let n = a - 1, q = 0, r, p; 0 <= n; n--) {
+        if (r = g[n], p = r.length, d >= p) {
+          d -= p;
         } else {
-          if (q + m > c || d) {
-            n = n.slice(d, c - m + d), q = n.length;
+          if (p + q > c || d) {
+            r = r.slice(d, c - q + d), p = r.length;
           }
-          e.push(n);
-          m += q;
-          if (c === m) {
+          e.push(r);
+          q += p;
+          if (c === q) {
             break;
           }
         }
       }
-      g = 1 < e.length ? [].concat.apply([], e) : e[0];
+      if (1 < e.length) {
+        g = e;
+        e = [];
+        f = z();
+        k = g.length;
+        for (l = 0; l < k; l++) {
+          for (a = g[l], h = a.length, m = 0; m < h; m++) {
+            if (b = a[m], !f[b]) {
+              if (f[b] = 1, d) {
+                d--;
+              } else {
+                if (e.push(b), e.length === c) {
+                  break;
+                }
+              }
+            }
+          }
+        }
+        c = e;
+      } else {
+        c = e[0];
+      }
+      g = c;
     } else {
       if (a < f) {
         return [];
@@ -1081,11 +1102,11 @@ O.prototype.search = function(a, b, c) {
   }
   let n = c = 0;
   if (1 < e) {
-    const p = z(), r = [];
+    const p = z(), t = [];
     for (let x = 0, A; x < e; x++) {
       if ((A = a[x]) && !p[A]) {
         if (f || this.db || V(this, A)) {
-          r.push(A), p[A] = 1;
+          t.push(A), p[A] = 1;
         } else {
           return h ? d : new S(d);
         }
@@ -1094,37 +1115,37 @@ O.prototype.search = function(a, b, c) {
         n = n ? Math.min(n, w) : w;
       }
     }
-    a = r;
+    a = t;
     e = a.length;
   }
   if (!e) {
     return h ? d : new S(d);
   }
-  let q = 0, t;
+  let q = 0, r;
   if (1 === e) {
     return U.call(this, a[0], "", b, g, h, k, l);
   }
   if (2 === e && m && !f) {
     return U.call(this, a[0], a[1], b, g, h, k, l);
   }
-  1 < e && (m ? (t = a[0], q = 1) : 9 < c && 3 < c / n && a.sort(aa));
+  1 < e && (m ? (r = a[0], q = 1) : 9 < c && 3 < c / n && a.sort(aa));
   if (this.db) {
     if (this.db.search && (m = this.db.search(this, a, b, g, f, h, k, l), !1 !== m)) {
       return m;
     }
     const p = this;
     return async function() {
-      for (let r, x; q < e; q++) {
+      for (let t, x; q < e; q++) {
         x = a[q];
-        t ? (r = await V(p, x, t), r = Ka(r, d, f, p.U, b, g, 2 === e), f && !1 === r && d.length || (t = x)) : (r = await V(p, x), r = Ka(r, d, f, p.resolution, b, g, 1 === e));
-        if (r) {
-          return r;
+        r ? (t = await V(p, x, r), t = Ka(t, d, f, p.U, b, g, 2 === e), f && !1 === t && d.length || (r = x)) : (t = await V(p, x), t = Ka(t, d, f, p.resolution, b, g, 1 === e));
+        if (t) {
+          return t;
         }
         if (f && q === e - 1) {
           let A = d.length;
           if (!A) {
-            if (t) {
-              t = "";
+            if (r) {
+              r = "";
               q = -1;
               continue;
             }
@@ -1138,17 +1159,17 @@ O.prototype.search = function(a, b, c) {
       return h ? Ia(d, p.resolution, b, g, f) : new S(d[0]);
     }();
   }
-  for (let p, r; q < e; q++) {
-    r = a[q];
-    t ? (p = V(this, r, t), p = Ka(p, d, f, this.U, b, g, 2 === e), f && !1 === p && d.length || (t = r)) : (p = V(this, r), p = Ka(p, d, f, this.resolution, b, g, 1 === e));
+  for (let p, t; q < e; q++) {
+    t = a[q];
+    r ? (p = V(this, t, r), p = Ka(p, d, f, this.U, b, g, 2 === e), f && !1 === p && d.length || (r = t)) : (p = V(this, t), p = Ka(p, d, f, this.resolution, b, g, 1 === e));
     if (p) {
       return p;
     }
     if (f && q === e - 1) {
       m = d.length;
       if (!m) {
-        if (t) {
-          t = "";
+        if (r) {
+          r = "";
           q = -1;
           continue;
         }
@@ -1597,7 +1618,7 @@ function Qa(a, b, c, d, e, f, g, h) {
     k = g || c.field || c.index;
     var n = this.tag && c.tag;
     var q = this.store && c.enrich;
-    var t = c.suggest;
+    var r = c.suggest;
     b = c.limit || b;
     l = c.offset || 0;
     b || (b = 100);
@@ -1610,18 +1631,18 @@ function Qa(a, b, c, d, e, f, g, h) {
           throw Error("A tag option can't be a string, instead it needs a { field: tag } format.");
         }
         if (v.field && v.tag) {
-          var r = v.tag;
-          if (r.constructor === Array) {
-            for (var x = 0; x < r.length; x++) {
-              p.push(v.field, r[x]);
+          var t = v.tag;
+          if (t.constructor === Array) {
+            for (var x = 0; x < t.length; x++) {
+              p.push(v.field, t[x]);
             }
           } else {
-            p.push(v.field, r);
+            p.push(v.field, t);
           }
         } else {
-          r = Object.keys(v);
-          for (let I = 0, J, D; I < r.length; I++) {
-            if (J = r[I], D = v[J], D.constructor === Array) {
+          t = Object.keys(v);
+          for (let I = 0, J, D; I < t.length; I++) {
+            if (J = t[I], D = v[J], D.constructor === Array) {
               for (x = 0; x < D.length; x++) {
                 p.push(J, D[x]);
               }
@@ -1636,7 +1657,7 @@ function Qa(a, b, c, d, e, f, g, h) {
       }
       n = p;
       if (!a) {
-        t = [];
+        r = [];
         if (p.length) {
           for (n = 0; n < p.length; n += 2) {
             if (this.db) {
@@ -1645,14 +1666,14 @@ function Qa(a, b, c, d, e, f, g, h) {
                 console.warn("Tag '" + p[n] + ":" + p[n + 1] + "' will be skipped because there is no field '" + p[n] + "'.");
                 continue;
               }
-              t.push(d = d.db.tag(p[n + 1], b, l, q));
+              r.push(d = d.db.tag(p[n + 1], b, l, q));
             } else {
               d = Sa.call(this, p[n], p[n + 1], b, l, q);
             }
             e.push({field:p[n], tag:p[n + 1], result:d});
           }
         }
-        return t.length ? Promise.all(t).then(function(w) {
+        return r.length ? Promise.all(r).then(function(w) {
           for (let v = 0; v < w.length; v++) {
             e[v].result = w[v];
           }
@@ -1671,29 +1692,29 @@ function Qa(a, b, c, d, e, f, g, h) {
       continue;
     }
     let D;
-    B(I) || (D = I, I = D.field, a = D.query || a, b = D.limit || b, t = D.suggest || t);
+    B(I) || (D = I, I = D.field, a = D.query || a, b = D.limit || b, r = D.suggest || r);
     if (d) {
       v = d[w];
     } else {
-      if (r = D || c, x = this.index.get(I), n && (this.db && (r.tag = n, A = x.db.Z, r.field = k), A || (r.enrich = !1)), p) {
-        p[w] = x.searchAsync(a, b, r);
-        r && q && (r.enrich = q);
+      if (t = D || c, x = this.index.get(I), n && (this.db && (t.tag = n, A = x.db.Z, t.field = k), A || (t.enrich = !1)), p) {
+        p[w] = x.searchAsync(a, b, t);
+        t && q && (t.enrich = q);
         continue;
       } else {
-        v = x.search(a, b, r), r && q && (r.enrich = q);
+        v = x.search(a, b, t), t && q && (t.enrich = q);
       }
     }
     J = v && v.length;
     if (n && J) {
-      r = [];
+      t = [];
       x = 0;
       if (this.db && d) {
         if (!A) {
           for (let E = k.length; E < d.length; E++) {
             let F = d[E];
             if (F && F.length) {
-              x++, r.push(F);
-            } else if (!t) {
+              x++, t.push(F);
+            } else if (!r) {
               return e;
             }
           }
@@ -1702,23 +1723,23 @@ function Qa(a, b, c, d, e, f, g, h) {
         for (let E = 0, F, bb; E < n.length; E += 2) {
           F = this.tag.get(n[E]);
           if (!F) {
-            if (console.warn("Tag '" + n[E] + ":" + n[E + 1] + "' will be skipped because there is no field '" + n[E] + "'."), t) {
+            if (console.warn("Tag '" + n[E] + ":" + n[E + 1] + "' will be skipped because there is no field '" + n[E] + "'."), r) {
               continue;
             } else {
               return e;
             }
           }
           if (bb = (F = F && F.get(n[E + 1])) && F.length) {
-            x++, r.push(F);
-          } else if (!t) {
+            x++, t.push(F);
+          } else if (!r) {
             return e;
           }
         }
       }
       if (x) {
-        v = Ja(v, r);
+        v = Ja(v, t);
         J = v.length;
-        if (!J && !t) {
+        if (!J && !r) {
           return e;
         }
         x--;
@@ -1735,7 +1756,7 @@ function Qa(a, b, c, d, e, f, g, h) {
       for (q = 0; q < n.length; q += 2) {
         d = this.index.get(n[q]);
         if (!d) {
-          if (console.warn("Tag '" + n[q] + ":" + n[q + 1] + "' was not found because there is no field '" + n[q] + "'."), t) {
+          if (console.warn("Tag '" + n[q] + ":" + n[q + 1] + "' was not found because there is no field '" + n[q] + "'."), r) {
             continue;
           } else {
             return e;
@@ -2229,14 +2250,14 @@ u.commit = async function(a, b, c) {
           var n;
           if (m && m.length) {
             const q = Math.max(m.length, l.length);
-            for (let t = 0, p, r; t < q; t++) {
-              if ((r = l[t]) && r.length) {
-                if ((p = m[t]) && p.length) {
-                  for (n = 0; n < r.length; n++) {
-                    p.push(r[n]);
+            for (let r = 0, p, t; r < q; r++) {
+              if ((t = l[r]) && t.length) {
+                if ((p = m[r]) && p.length) {
+                  for (n = 0; n < t.length; n++) {
+                    p.push(t[n]);
                   }
                 } else {
-                  m[t] = r;
+                  m[r] = t;
                 }
                 n = 1;
               }
diff --git a/dist/flexsearch.bundle.min.js b/dist/flexsearch.bundle.min.js
index d016782..47ac4b5 100644
--- a/dist/flexsearch.bundle.min.js
+++ b/dist/flexsearch.bundle.min.js
@@ -27,23 +27,23 @@ function J(a){if(!this)return new J(a);this.index=a?[a]:[];this.length=a?a.lengt
 function K(a=8){if(!this)return new K(a);this.index=z();this.C=[];this.size=0;32<a?(this.h=xa,this.B=BigInt(a)):(this.h=ya,this.B=a)}K.prototype.get=function(a){const b=this.index[this.h(a)];return b&&b.get(a)};K.prototype.set=function(a,b){var c=this.h(a);let d=this.index[c];d?(c=d.size,d.set(a,b),(c-=d.size)&&this.size++):(this.index[c]=d=new Map([[a,b]]),this.C.push(d))};function M(a=8){if(!this)return new M(a);this.index=z();this.h=[];32<a?(this.C=xa,this.B=BigInt(a)):(this.C=ya,this.B=a)}
 M.prototype.add=function(a){var b=this.C(a);let c=this.index[b];c?(b=c.size,c.add(a),(b-=c.size)&&this.size++):(this.index[b]=c=new Set([a]),this.h.push(c))};u=K.prototype;u.has=M.prototype.has=function(a){const b=this.index[this.C(a)];return b&&b.has(a)};u.delete=M.prototype.delete=function(a){const b=this.index[this.C(a)];b&&b.delete(a)&&this.size--};u.clear=M.prototype.clear=function(){this.index=z();this.h=[];this.size=0};u.values=M.prototype.values=function*(){for(let a=0;a<this.h.length;a++)for(let b of this.h[a].values())yield b};
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-function xa(a){let b=BigInt(2)**this.B-BigInt(1);var c=typeof a;if("bigint"===c)return a&b;if("number"===c)return BigInt(a)&b;c=BigInt(0);let d=this.B+BigInt(1);for(let e=0;e<a.length;e++)c=(c*d^BigInt(a.charCodeAt(e)))&b;return c};function za(a,b,c,d,e,f,g,h){(d=a(c?c+"."+d:d,JSON.stringify(g)))&&d.then?d.then(function(){b.export(a,b,c,e,f+1,h)}):b.export(a,b,c,e,f+1,h)};const Aa={memory:{resolution:1},performance:{resolution:6,fastupdate:!0,context:{depth:1,resolution:3}},match:{tokenize:"forward"},score:{resolution:9,context:{depth:2,resolution:9}}};function Ba(a){N.call(a,"add");N.call(a,"append");N.call(a,"search");N.call(a,"update");N.call(a,"remove")}function N(a){this[a+"Async"]=function(){var b=arguments;const c=b[b.length-1];let d;"function"===typeof c&&(d=c,delete b[b.length-1]);this.async=!0;b=this[a].apply(this,b);this.async=!1;d&&(b.then?b.then(d):d(b));return b}};z();O.prototype.add=function(a,b,c,d){if(b&&(a||0===a)){if(!d&&!c&&this.A.has(a))return this.update(a,b);b=this.encoder.encode(b);if(d=b.length){const l=z(),m=z(),n=this.depth,q=this.resolution;for(let t=0;t<d;t++){let p=b[this.rtl?d-1-t:t];var e=p.length;if(e&&(n||!m[p])){var f=this.score?this.score(b,p,t,null,0):P(q,d,t),g="";switch(this.tokenize){case "full":if(2<e){for(f=0;f<e;f++)for(var h=e;h>f;h--){g=p.substring(f,h);var k=this.score?this.score(b,p,t,g,f):P(q,d,t,e,f);Q(this,m,g,k,a,c)}break}case "reverse":if(1<
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 u.enrich=function(a){"object"!==typeof a&&(a=[a]);const b=this.db.transaction("reg","readonly").objectStore("reg"),c=[];for(let d=0;d<a.length;d++)c[d]=Z(b.get(a[d]));return Promise.all(c).then(function(d){for(let e=0;e<d.length;e++)d[e]={id:a[e],doc:d[e]?JSON.parse(d[e]):null};return d})};u.has=function(a){a=this.db.transaction("reg","readonly").objectStore("reg").getKey(a);return Z(a)};u.search=null;u.info=function(){};
 u.transaction=function(a,b,c){let d=this.h[a+":"+b];if(d)return c.call(this,d);let e=this.db.transaction(a,b);this.h[a+":"+b]=d=e.objectStore(a);return new Promise((f,g)=>{e.onerror=h=>{this.h[a+":"+b]=null;e.abort();e=d=null;g(h)};e.oncomplete=h=>{e=d=this.h[a+":"+b]=null;f(h||!0)};return c.call(this,d)})};
 u.commit=async function(a,b,c){if(b)await this.clear(),a.K=[];else{let d=a.K;a.K=[];for(let e=0,f;e<d.length;e++)if(f=d[e],f.clear){await this.clear();b=!0;break}else d[e]=f.$;b||(c||(d=d.concat(ba(a.A))),d.length&&await this.remove(d))}a.A.size&&(await this.transaction("map","readwrite",function(d){for(const e of a.map){const f=e[0],g=e[1];g.length&&(b?d.put(g,f):d.get(f).onsuccess=function(){let h=this.result;var k;if(h&&h.length){const l=Math.max(h.length,g.length);for(let m=0,n,q;m<l;m++)if((q=
-g[m])&&q.length){if((n=h[m])&&n.length)for(k=0;k<q.length;k++)n.push(q[k]);else h[m]=q;k=1}}else h=g,k=1;k&&d.put(h,f)})}}),await this.transaction("ctx","readwrite",function(d){for(const e of a.F){const f=e[0],g=e[1];for(const h of g){const k=h[0],l=h[1];l.length&&(b?d.put(l,f+":"+k):d.get(f+":"+k).onsuccess=function(){let m=this.result;var n;if(m&&m.length){const q=Math.max(m.length,l.length);for(let t=0,p,r;t<q;t++)if((r=l[t])&&r.length){if((p=m[t])&&p.length)for(n=0;n<r.length;n++)p.push(r[n]);
-else m[t]=r;n=1}}else m=l,n=1;n&&d.put(m,f+":"+k)})}}}),a.store?await this.transaction("reg","readwrite",function(d){for(const e of a.store){const f=e[0],g=e[1];d.put("object"===typeof g?JSON.stringify(g):1,f)}}):a.Y||await this.transaction("reg","readwrite",function(d){for(const e of a.A.keys())d.put(1,e)}),a.tag&&await this.transaction("tag","readwrite",function(d){for(const e of a.tag){const f=e[0],g=e[1];g.length&&(d.get(f).onsuccess=function(){let h=this.result;h=h&&h.length?h.concat(g):g;d.put(h,
+g[m])&&q.length){if((n=h[m])&&n.length)for(k=0;k<q.length;k++)n.push(q[k]);else h[m]=q;k=1}}else h=g,k=1;k&&d.put(h,f)})}}),await this.transaction("ctx","readwrite",function(d){for(const e of a.F){const f=e[0],g=e[1];for(const h of g){const k=h[0],l=h[1];l.length&&(b?d.put(l,f+":"+k):d.get(f+":"+k).onsuccess=function(){let m=this.result;var n;if(m&&m.length){const q=Math.max(m.length,l.length);for(let r=0,p,t;r<q;r++)if((t=l[r])&&t.length){if((p=m[r])&&p.length)for(n=0;n<t.length;n++)p.push(t[n]);
+else m[r]=t;n=1}}else m=l,n=1;n&&d.put(m,f+":"+k)})}}}),a.store?await this.transaction("reg","readwrite",function(d){for(const e of a.store){const f=e[0],g=e[1];d.put("object"===typeof g?JSON.stringify(g):1,f)}}):a.Y||await this.transaction("reg","readwrite",function(d){for(const e of a.A.keys())d.put(1,e)}),a.tag&&await this.transaction("tag","readwrite",function(d){for(const e of a.tag){const f=e[0],g=e[1];g.length&&(d.get(f).onsuccess=function(){let h=this.result;h=h&&h.length?h.concat(g):g;d.put(h,
 f)})}}),a.map.clear(),a.F.clear(),a.tag&&a.tag.clear(),a.store&&a.store.clear(),a.document||a.A.clear())};function $a(a,b,c){const d=a.value;let e,f,g=0;for(let h=0,k;h<d.length;h++){if(k=c?d:d[h]){for(let l=0,m,n;l<b.length;l++)if(n=b[l],m=k.indexOf(f?parseInt(n,10):n),0>m&&!f&&"string"===typeof n&&!isNaN(n)&&(m=k.indexOf(parseInt(n,10)))&&(f=1),0<=m)if(e=1,1<k.length)k.splice(m,1);else{d[h]=[];break}g+=k.length}if(c)break}g?e&&a.update(d):a.delete();a.continue()}
 u.remove=function(a){"object"!==typeof a&&(a=[a]);return Promise.all([this.transaction("map","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&$a(c,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&$a(c,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&$a(c,a,!0)}}),this.transaction("reg","readwrite",function(b){for(let c=0;c<a.length;c++)b.delete(a[c])})])};
 function Z(a){return new Promise((b,c)=>{a.onsuccess=function(){b(this.result)};a.oncomplete=function(){b(this.result)};a.onerror=c;a=null})};const ab={Index:O,Charset:va,Encoder:F,Document:Y,Worker:W,Resolver:S,IndexedDB:Ya,Language:{}},cb=self;let db;(db=cb.define)&&db.amd?db([],function(){return ab}):"object"===typeof cb.exports?cb.exports=ab:cb.FlexSearch=ab;}(this));
diff --git a/dist/flexsearch.bundle.module.debug.js b/dist/flexsearch.bundle.module.debug.js
index 39707d1..387f2a4 100644
--- a/dist/flexsearch.bundle.module.debug.js
+++ b/dist/flexsearch.bundle.module.debug.js
@@ -498,18 +498,18 @@ O.prototype.add = function(a, b, c, d) {
     b = this.encoder.encode(b);
     if (d = b.length) {
       const l = z(), m = z(), n = this.depth, q = this.resolution;
-      for (let t = 0; t < d; t++) {
-        let p = b[this.rtl ? d - 1 - t : t];
+      for (let r = 0; r < d; r++) {
+        let p = b[this.rtl ? d - 1 - r : r];
         var e = p.length;
         if (e && (n || !m[p])) {
-          var f = this.score ? this.score(b, p, t, null, 0) : P(q, d, t), g = "";
+          var f = this.score ? this.score(b, p, r, null, 0) : P(q, d, r), g = "";
           switch(this.tokenize) {
             case "full":
               if (2 < e) {
                 for (f = 0; f < e; f++) {
                   for (var h = e; h > f; h--) {
                     g = p.substring(f, h);
-                    var k = this.score ? this.score(b, p, t, g, f) : P(q, d, t, e, f);
+                    var k = this.score ? this.score(b, p, r, g, f) : P(q, d, r, e, f);
                     Q(this, m, g, k, a, c);
                   }
                 }
@@ -518,7 +518,7 @@ O.prototype.add = function(a, b, c, d) {
             case "reverse":
               if (1 < e) {
                 for (h = e - 1; 0 < h; h--) {
-                  g = p[h] + g, k = this.score ? this.score(b, p, t, g, h) : P(q, d, t, e, h), Q(this, m, g, k, a, c);
+                  g = p[h] + g, k = this.score ? this.score(b, p, r, g, h) : P(q, d, r, e, h), Q(this, m, g, k, a, c);
                 }
                 g = "";
               }
@@ -530,12 +530,12 @@ O.prototype.add = function(a, b, c, d) {
                 break;
               }
             default:
-              if (Q(this, m, p, f, a, c), n && 1 < d && t < d - 1) {
-                for (e = z(), g = this.U, f = p, h = Math.min(n + 1, d - t), e[f] = 1, k = 1; k < h; k++) {
-                  if ((p = b[this.rtl ? d - 1 - t - k : t + k]) && !e[p]) {
+              if (Q(this, m, p, f, a, c), n && 1 < d && r < d - 1) {
+                for (e = z(), g = this.U, f = p, h = Math.min(n + 1, d - r), e[f] = 1, k = 1; k < h; k++) {
+                  if ((p = b[this.rtl ? d - 1 - r - k : r + k]) && !e[p]) {
                     e[p] = 1;
-                    const r = this.score ? this.score(b, f, t, p, k) : P(g + (d / 2 > g ? 0 : 1), d, t, h - 1, k - 1), x = this.bidirectional && p > f;
-                    Q(this, l, x ? f : p, r, a, c, x ? p : f);
+                    const t = this.score ? this.score(b, f, r, p, k) : P(g + (d / 2 > g ? 0 : 1), d, r, h - 1, k - 1), x = this.bidirectional && p > f;
+                    Q(this, l, x ? f : p, t, a, c, x ? p : f);
                   }
                 }
               }
@@ -677,17 +677,17 @@ function Ea(a, b, c, d, e, f) {
     for (let n = 0, q; n < a.length; n++) {
       if (q = a[n]) {
         if (m = q[l]) {
-          for (let t = 0, p; t < m.length; t++) {
-            if (p = m[t], !h[p]) {
+          for (let r = 0, p; r < m.length; r++) {
+            if (p = m[r], !h[p]) {
               if (h[p] = 1, c) {
                 c--;
               } else {
                 if (e) {
                   d.push(p);
                 } else {
-                  const r = l + (n ? f : 0);
-                  d[r] || (d[r] = []);
-                  d[r].push(p);
+                  const t = l + (n ? f : 0);
+                  d[t] || (d[t] = []);
+                  d[t].push(p);
                 }
                 if (b && ++g === b) {
                   return d;
@@ -768,13 +768,13 @@ function Fa(a, b, c, d, e) {
     if (!m || !m.length) {
       return [];
     }
-    let n = z(), q = 0, t = l === a.length - 1;
-    for (let p = 0, r; p < k; p++) {
-      if (r = m[p]) {
-        for (let x = 0, A, w; x < r.length; x++) {
-          if (A = r[x], !l) {
+    let n = z(), q = 0, r = l === a.length - 1;
+    for (let p = 0, t; p < k; p++) {
+      if (t = m[p]) {
+        for (let x = 0, A, w; x < t.length; x++) {
+          if (A = t[x], !l) {
             n[A] = p + 1 + (l ? e : 0), q = 1;
-          } else if (t) {
+          } else if (r) {
             if (w = h[A]) {
               if (q = 1, c) {
                 c--;
@@ -996,14 +996,13 @@ S.prototype.resolve = function(a, b, c) {
   return d.length ? ("object" === typeof a && (c = a.enrich, b = a.offset, a = a.limit), R(d, a || 100, b, c)) : d;
 };
 function Ia(a, b, c, d, e) {
-  const f = a.length;
-  let g = [], h, k;
-  h = z();
-  for (let l = 0, m, n, q, t; l < b; l++) {
-    for (let p = 0; p < f; p++) {
-      if (q = a[p], l < q.length && (m = q[l])) {
-        for (let r = 0; r < m.length; r++) {
-          n = m[r], (k = h[n]) ? h[n]++ : (k = 0, h[n] = 1), t = g[k] || (g[k] = []), t.push(n);
+  var f = a.length, g = [], h;
+  var k = z();
+  for (let n = 0, q, r, p, t; n < b; n++) {
+    for (var l = 0; l < f; l++) {
+      if (p = a[l], n < p.length && (q = p[n])) {
+        for (var m = 0; m < q.length; m++) {
+          r = q[m], (h = k[r]) ? k[r]++ : (h = 0, k[r] = 1), t = g[h] || (g[h] = []), t.push(r);
         }
       }
     }
@@ -1011,21 +1010,43 @@ function Ia(a, b, c, d, e) {
   if (a = g.length) {
     if (e) {
       e = [];
-      for (let l = a - 1, m = 0, n, q; 0 <= l; l--) {
-        if (n = g[l], q = n.length, d >= q) {
-          d -= q;
+      for (let n = a - 1, q = 0, r, p; 0 <= n; n--) {
+        if (r = g[n], p = r.length, d >= p) {
+          d -= p;
         } else {
-          if (q + m > c || d) {
-            n = n.slice(d, c - m + d), q = n.length;
+          if (p + q > c || d) {
+            r = r.slice(d, c - q + d), p = r.length;
           }
-          e.push(n);
-          m += q;
-          if (c === m) {
+          e.push(r);
+          q += p;
+          if (c === q) {
             break;
           }
         }
       }
-      g = 1 < e.length ? [].concat.apply([], e) : e[0];
+      if (1 < e.length) {
+        g = e;
+        e = [];
+        f = z();
+        k = g.length;
+        for (l = 0; l < k; l++) {
+          for (a = g[l], h = a.length, m = 0; m < h; m++) {
+            if (b = a[m], !f[b]) {
+              if (f[b] = 1, d) {
+                d--;
+              } else {
+                if (e.push(b), e.length === c) {
+                  break;
+                }
+              }
+            }
+          }
+        }
+        c = e;
+      } else {
+        c = e[0];
+      }
+      g = c;
     } else {
       if (a < f) {
         return [];
@@ -1080,11 +1101,11 @@ O.prototype.search = function(a, b, c) {
   }
   let n = c = 0;
   if (1 < e) {
-    const p = z(), r = [];
+    const p = z(), t = [];
     for (let x = 0, A; x < e; x++) {
       if ((A = a[x]) && !p[A]) {
         if (f || this.db || V(this, A)) {
-          r.push(A), p[A] = 1;
+          t.push(A), p[A] = 1;
         } else {
           return h ? d : new S(d);
         }
@@ -1093,37 +1114,37 @@ O.prototype.search = function(a, b, c) {
         n = n ? Math.min(n, w) : w;
       }
     }
-    a = r;
+    a = t;
     e = a.length;
   }
   if (!e) {
     return h ? d : new S(d);
   }
-  let q = 0, t;
+  let q = 0, r;
   if (1 === e) {
     return U.call(this, a[0], "", b, g, h, k, l);
   }
   if (2 === e && m && !f) {
     return U.call(this, a[0], a[1], b, g, h, k, l);
   }
-  1 < e && (m ? (t = a[0], q = 1) : 9 < c && 3 < c / n && a.sort(aa));
+  1 < e && (m ? (r = a[0], q = 1) : 9 < c && 3 < c / n && a.sort(aa));
   if (this.db) {
     if (this.db.search && (m = this.db.search(this, a, b, g, f, h, k, l), !1 !== m)) {
       return m;
     }
     const p = this;
     return async function() {
-      for (let r, x; q < e; q++) {
+      for (let t, x; q < e; q++) {
         x = a[q];
-        t ? (r = await V(p, x, t), r = Ka(r, d, f, p.U, b, g, 2 === e), f && !1 === r && d.length || (t = x)) : (r = await V(p, x), r = Ka(r, d, f, p.resolution, b, g, 1 === e));
-        if (r) {
-          return r;
+        r ? (t = await V(p, x, r), t = Ka(t, d, f, p.U, b, g, 2 === e), f && !1 === t && d.length || (r = x)) : (t = await V(p, x), t = Ka(t, d, f, p.resolution, b, g, 1 === e));
+        if (t) {
+          return t;
         }
         if (f && q === e - 1) {
           let A = d.length;
           if (!A) {
-            if (t) {
-              t = "";
+            if (r) {
+              r = "";
               q = -1;
               continue;
             }
@@ -1137,17 +1158,17 @@ O.prototype.search = function(a, b, c) {
       return h ? Ia(d, p.resolution, b, g, f) : new S(d[0]);
     }();
   }
-  for (let p, r; q < e; q++) {
-    r = a[q];
-    t ? (p = V(this, r, t), p = Ka(p, d, f, this.U, b, g, 2 === e), f && !1 === p && d.length || (t = r)) : (p = V(this, r), p = Ka(p, d, f, this.resolution, b, g, 1 === e));
+  for (let p, t; q < e; q++) {
+    t = a[q];
+    r ? (p = V(this, t, r), p = Ka(p, d, f, this.U, b, g, 2 === e), f && !1 === p && d.length || (r = t)) : (p = V(this, t), p = Ka(p, d, f, this.resolution, b, g, 1 === e));
     if (p) {
       return p;
     }
     if (f && q === e - 1) {
       m = d.length;
       if (!m) {
-        if (t) {
-          t = "";
+        if (r) {
+          r = "";
           q = -1;
           continue;
         }
@@ -1596,7 +1617,7 @@ function Qa(a, b, c, d, e, f, g, h) {
     k = g || c.field || c.index;
     var n = this.tag && c.tag;
     var q = this.store && c.enrich;
-    var t = c.suggest;
+    var r = c.suggest;
     b = c.limit || b;
     l = c.offset || 0;
     b || (b = 100);
@@ -1609,18 +1630,18 @@ function Qa(a, b, c, d, e, f, g, h) {
           throw Error("A tag option can't be a string, instead it needs a { field: tag } format.");
         }
         if (v.field && v.tag) {
-          var r = v.tag;
-          if (r.constructor === Array) {
-            for (var x = 0; x < r.length; x++) {
-              p.push(v.field, r[x]);
+          var t = v.tag;
+          if (t.constructor === Array) {
+            for (var x = 0; x < t.length; x++) {
+              p.push(v.field, t[x]);
             }
           } else {
-            p.push(v.field, r);
+            p.push(v.field, t);
           }
         } else {
-          r = Object.keys(v);
-          for (let I = 0, J, D; I < r.length; I++) {
-            if (J = r[I], D = v[J], D.constructor === Array) {
+          t = Object.keys(v);
+          for (let I = 0, J, D; I < t.length; I++) {
+            if (J = t[I], D = v[J], D.constructor === Array) {
               for (x = 0; x < D.length; x++) {
                 p.push(J, D[x]);
               }
@@ -1635,7 +1656,7 @@ function Qa(a, b, c, d, e, f, g, h) {
       }
       n = p;
       if (!a) {
-        t = [];
+        r = [];
         if (p.length) {
           for (n = 0; n < p.length; n += 2) {
             if (this.db) {
@@ -1644,14 +1665,14 @@ function Qa(a, b, c, d, e, f, g, h) {
                 console.warn("Tag '" + p[n] + ":" + p[n + 1] + "' will be skipped because there is no field '" + p[n] + "'.");
                 continue;
               }
-              t.push(d = d.db.tag(p[n + 1], b, l, q));
+              r.push(d = d.db.tag(p[n + 1], b, l, q));
             } else {
               d = Sa.call(this, p[n], p[n + 1], b, l, q);
             }
             e.push({field:p[n], tag:p[n + 1], result:d});
           }
         }
-        return t.length ? Promise.all(t).then(function(w) {
+        return r.length ? Promise.all(r).then(function(w) {
           for (let v = 0; v < w.length; v++) {
             e[v].result = w[v];
           }
@@ -1670,29 +1691,29 @@ function Qa(a, b, c, d, e, f, g, h) {
       continue;
     }
     let D;
-    B(I) || (D = I, I = D.field, a = D.query || a, b = D.limit || b, t = D.suggest || t);
+    B(I) || (D = I, I = D.field, a = D.query || a, b = D.limit || b, r = D.suggest || r);
     if (d) {
       v = d[w];
     } else {
-      if (r = D || c, x = this.index.get(I), n && (this.db && (r.tag = n, A = x.db.Z, r.field = k), A || (r.enrich = !1)), p) {
-        p[w] = x.searchAsync(a, b, r);
-        r && q && (r.enrich = q);
+      if (t = D || c, x = this.index.get(I), n && (this.db && (t.tag = n, A = x.db.Z, t.field = k), A || (t.enrich = !1)), p) {
+        p[w] = x.searchAsync(a, b, t);
+        t && q && (t.enrich = q);
         continue;
       } else {
-        v = x.search(a, b, r), r && q && (r.enrich = q);
+        v = x.search(a, b, t), t && q && (t.enrich = q);
       }
     }
     J = v && v.length;
     if (n && J) {
-      r = [];
+      t = [];
       x = 0;
       if (this.db && d) {
         if (!A) {
           for (let E = k.length; E < d.length; E++) {
             let F = d[E];
             if (F && F.length) {
-              x++, r.push(F);
-            } else if (!t) {
+              x++, t.push(F);
+            } else if (!r) {
               return e;
             }
           }
@@ -1701,23 +1722,23 @@ function Qa(a, b, c, d, e, f, g, h) {
         for (let E = 0, F, Za; E < n.length; E += 2) {
           F = this.tag.get(n[E]);
           if (!F) {
-            if (console.warn("Tag '" + n[E] + ":" + n[E + 1] + "' will be skipped because there is no field '" + n[E] + "'."), t) {
+            if (console.warn("Tag '" + n[E] + ":" + n[E + 1] + "' will be skipped because there is no field '" + n[E] + "'."), r) {
               continue;
             } else {
               return e;
             }
           }
           if (Za = (F = F && F.get(n[E + 1])) && F.length) {
-            x++, r.push(F);
-          } else if (!t) {
+            x++, t.push(F);
+          } else if (!r) {
             return e;
           }
         }
       }
       if (x) {
-        v = Ja(v, r);
+        v = Ja(v, t);
         J = v.length;
-        if (!J && !t) {
+        if (!J && !r) {
           return e;
         }
         x--;
@@ -1734,7 +1755,7 @@ function Qa(a, b, c, d, e, f, g, h) {
       for (q = 0; q < n.length; q += 2) {
         d = this.index.get(n[q]);
         if (!d) {
-          if (console.warn("Tag '" + n[q] + ":" + n[q + 1] + "' was not found because there is no field '" + n[q] + "'."), t) {
+          if (console.warn("Tag '" + n[q] + ":" + n[q + 1] + "' was not found because there is no field '" + n[q] + "'."), r) {
             continue;
           } else {
             return e;
@@ -2228,14 +2249,14 @@ u.commit = async function(a, b, c) {
           var n;
           if (m && m.length) {
             const q = Math.max(m.length, l.length);
-            for (let t = 0, p, r; t < q; t++) {
-              if ((r = l[t]) && r.length) {
-                if ((p = m[t]) && p.length) {
-                  for (n = 0; n < r.length; n++) {
-                    p.push(r[n]);
+            for (let r = 0, p, t; r < q; r++) {
+              if ((t = l[r]) && t.length) {
+                if ((p = m[r]) && p.length) {
+                  for (n = 0; n < t.length; n++) {
+                    p.push(t[n]);
                   }
                 } else {
-                  m[t] = r;
+                  m[r] = t;
                 }
                 n = 1;
               }
diff --git a/dist/flexsearch.bundle.module.min.js b/dist/flexsearch.bundle.module.min.js
index a21d42b..b4eeeb8 100644
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+(k=[k])}k||(k=this.field);p=!d&&(this.worker||this.async)&&[];let A;for(let w=0,v,H,I;w<k.length;w++){H=k[w];if(this.db&&this.tag&&!this.I[w])continue;let D;B(H)||(D=H,H=D.field,a=D.query||a,b=D.limit||b,r=D.suggest||r);if(d)v=d[w];else if(t=D||c,x=this.index.get(H),n&&(this.db&&(t.tag=n,A=x.db.Z,t.field=k),A||(t.enrich=!1)),p){p[w]=x.searchAsync(a,b,t);t&&q&&(t.enrich=q);continue}else v=x.search(a,b,t),t&&q&&(t.enrich=q);I=v&&v.length;if(n&&I){t=[];x=0;if(this.db&&d){if(!A)for(let L=k.length;L<d.length;L++){let E=
+d[L];if(E&&E.length)x++,t.push(E);else if(!r)return e}}else for(let L=0,E,Za;L<n.length;L+=2){E=this.tag.get(n[L]);if(!E)if(r)continue;else return e;if(Za=(E=E&&E.get(n[L+1]))&&E.length)x++,t.push(E);else if(!r)return e}if(x){v=Ja(v,t);I=v.length;if(!I&&!r)return e;x--}}if(I)f[m]=H,e.push(v),m++;else if(1===k.length)return e}if(p){if(this.db&&n&&n.length&&!A)for(q=0;q<n.length;q+=2){d=this.index.get(n[q]);if(!d)if(r)continue;else return e;p.push(d.db.tag(n[q+1],b,l,!1))}const w=this;return Promise.all(p).then(function(v){return v.length?
 w.search(a,b,c,v):v})}if(!m)return e;if(g&&(!q||!this.store))return e[0];p=[];for(let w=0,v;w<f.length;w++){v=e[w];q&&v.length&&!v[0].doc&&(this.db?p.push(v=this.index.get(this.field[0]).db.enrich(v)):v.length&&(v=Ta.call(this,v)));if(g)return v;e[w]={field:f[w],result:v}}return q&&this.db&&p.length?Promise.all(p).then(function(w){for(let v=0;v<w.length;v++)e[v].result=w[v];return h?Ua(e,b):e}):h?Ua(e,b):e};
 function Ua(a,b){const c=[],d=z();for(let e=0,f,g;e<a.length;e++){f=a[e];g=f.result;for(let h=0,k,l,m;h<g.length;h++)if(l=g[h],k=l.id,m=d[k])m.push(f.field);else{if(c.length===b)return c;l.field=d[k]=[f.field];c.push(l)}}return c}function Sa(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=Ta.call(this,a));return a}}
 function Ta(a){const b=Array(a.length);for(let c=0,d;c<a.length;c++)d=a[c],b[c]={id:d,doc:this.store.get(d)};return b};function Y(a){if(!this)return new Y(a);const b=a.document||a.doc||a;var c,d;this.I=[];this.field=[];this.N=[];this.key=(c=b.key||b.id)&&Va(c,this.N)||"id";(d=a.keystore||0)&&(this.keystore=d);this.A=(this.fastupdate=!!a.fastupdate)?d?new K(d):new Map:d?new M(d):new Set;this.D=(c=b.store||null)&&!0!==c&&[];this.store=c&&(d?new K(d):new Map);this.cache=(c=a.cache||null)&&new G(c);a.cache=!1;this.worker=a.worker;this.async=!1;c=new Map;d=b.index||b.field||b;B(d)&&(d=[d]);for(let e=0,f,g;e<d.length;e++){f=
@@ -81,8 +81,8 @@ u.tag=function(a,b=0,c=0,d=!1){a=this.db.transaction("tag","readonly").objectSto
 u.enrich=function(a){"object"!==typeof a&&(a=[a]);const b=this.db.transaction("reg","readonly").objectStore("reg"),c=[];for(let d=0;d<a.length;d++)c[d]=Z(b.get(a[d]));return Promise.all(c).then(function(d){for(let e=0;e<d.length;e++)d[e]={id:a[e],doc:d[e]?JSON.parse(d[e]):null};return d})};u.has=function(a){a=this.db.transaction("reg","readonly").objectStore("reg").getKey(a);return Z(a)};u.search=null;u.info=function(){};
 u.transaction=function(a,b,c){let d=this.h[a+":"+b];if(d)return c.call(this,d);let e=this.db.transaction(a,b);this.h[a+":"+b]=d=e.objectStore(a);return new Promise((f,g)=>{e.onerror=h=>{this.h[a+":"+b]=null;e.abort();e=d=null;g(h)};e.oncomplete=h=>{e=d=this.h[a+":"+b]=null;f(h||!0)};return c.call(this,d)})};
 u.commit=async function(a,b,c){if(b)await this.clear(),a.K=[];else{let d=a.K;a.K=[];for(let e=0,f;e<d.length;e++)if(f=d[e],f.clear){await this.clear();b=!0;break}else d[e]=f.$;b||(c||(d=d.concat(ba(a.A))),d.length&&await this.remove(d))}a.A.size&&(await this.transaction("map","readwrite",function(d){for(const e of a.map){const f=e[0],g=e[1];g.length&&(b?d.put(g,f):d.get(f).onsuccess=function(){let h=this.result;var k;if(h&&h.length){const l=Math.max(h.length,g.length);for(let m=0,n,q;m<l;m++)if((q=
-g[m])&&q.length){if((n=h[m])&&n.length)for(k=0;k<q.length;k++)n.push(q[k]);else h[m]=q;k=1}}else h=g,k=1;k&&d.put(h,f)})}}),await this.transaction("ctx","readwrite",function(d){for(const e of a.F){const f=e[0],g=e[1];for(const h of g){const k=h[0],l=h[1];l.length&&(b?d.put(l,f+":"+k):d.get(f+":"+k).onsuccess=function(){let m=this.result;var n;if(m&&m.length){const q=Math.max(m.length,l.length);for(let t=0,p,r;t<q;t++)if((r=l[t])&&r.length){if((p=m[t])&&p.length)for(n=0;n<r.length;n++)p.push(r[n]);
-else m[t]=r;n=1}}else m=l,n=1;n&&d.put(m,f+":"+k)})}}}),a.store?await this.transaction("reg","readwrite",function(d){for(const e of a.store){const f=e[0],g=e[1];d.put("object"===typeof g?JSON.stringify(g):1,f)}}):a.Y||await this.transaction("reg","readwrite",function(d){for(const e of a.A.keys())d.put(1,e)}),a.tag&&await this.transaction("tag","readwrite",function(d){for(const e of a.tag){const f=e[0],g=e[1];g.length&&(d.get(f).onsuccess=function(){let h=this.result;h=h&&h.length?h.concat(g):g;d.put(h,
+g[m])&&q.length){if((n=h[m])&&n.length)for(k=0;k<q.length;k++)n.push(q[k]);else h[m]=q;k=1}}else h=g,k=1;k&&d.put(h,f)})}}),await this.transaction("ctx","readwrite",function(d){for(const e of a.F){const f=e[0],g=e[1];for(const h of g){const k=h[0],l=h[1];l.length&&(b?d.put(l,f+":"+k):d.get(f+":"+k).onsuccess=function(){let m=this.result;var n;if(m&&m.length){const q=Math.max(m.length,l.length);for(let r=0,p,t;r<q;r++)if((t=l[r])&&t.length){if((p=m[r])&&p.length)for(n=0;n<t.length;n++)p.push(t[n]);
+else m[r]=t;n=1}}else m=l,n=1;n&&d.put(m,f+":"+k)})}}}),a.store?await this.transaction("reg","readwrite",function(d){for(const e of a.store){const f=e[0],g=e[1];d.put("object"===typeof g?JSON.stringify(g):1,f)}}):a.Y||await this.transaction("reg","readwrite",function(d){for(const e of a.A.keys())d.put(1,e)}),a.tag&&await this.transaction("tag","readwrite",function(d){for(const e of a.tag){const f=e[0],g=e[1];g.length&&(d.get(f).onsuccess=function(){let h=this.result;h=h&&h.length?h.concat(g):g;d.put(h,
 f)})}}),a.map.clear(),a.F.clear(),a.tag&&a.tag.clear(),a.store&&a.store.clear(),a.document||a.A.clear())};function ab(a,b,c){const d=a.value;let e,f,g=0;for(let h=0,k;h<d.length;h++){if(k=c?d:d[h]){for(let l=0,m,n;l<b.length;l++)if(n=b[l],m=k.indexOf(f?parseInt(n,10):n),0>m&&!f&&"string"===typeof n&&!isNaN(n)&&(m=k.indexOf(parseInt(n,10)))&&(f=1),0<=m)if(e=1,1<k.length)k.splice(m,1);else{d[h]=[];break}g+=k.length}if(c)break}g?e&&a.update(d):a.delete();a.continue()}
 u.remove=function(a){"object"!==typeof a&&(a=[a]);return Promise.all([this.transaction("map","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&ab(c,a)}}),this.transaction("ctx","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&ab(c,a)}}),this.transaction("tag","readwrite",function(b){b.openCursor().onsuccess=function(){const c=this.result;c&&ab(c,a,!0)}}),this.transaction("reg","readwrite",function(b){for(let c=0;c<a.length;c++)b.delete(a[c])})])};
 function Z(a){return new Promise((b,c)=>{a.onsuccess=function(){b(this.result)};a.oncomplete=function(){b(this.result)};a.onerror=c;a=null})};export default {Index:O,Charset:va,Encoder:F,Document:Y,Worker:W,Resolver:S,IndexedDB:Ya,Language:{}};
diff --git a/dist/flexsearch.compact.debug.js b/dist/flexsearch.compact.debug.js
index 62785f9..a029b8c 100644
--- a/dist/flexsearch.compact.debug.js
+++ b/dist/flexsearch.compact.debug.js
@@ -510,7 +510,29 @@ function O(a, c, b, e, d) {
             }
           }
         }
-        g = 1 < e.length ? [].concat.apply([], e) : e[0];
+        if (1 < e.length) {
+          g = e;
+          a = [];
+          e = y();
+          f = g.length;
+          for (k = 0; k < f; k++) {
+            for (m = g[k], h = m.length, l = 0; l < h; l++) {
+              if (b = m[l], !e[b]) {
+                if (e[b] = 1, d) {
+                  d--;
+                } else {
+                  if (a.push(b), a.length === c) {
+                    break;
+                  }
+                }
+              }
+            }
+          }
+          c = a;
+        } else {
+          c = e[0];
+        }
+        g = c;
       } else {
         if (a < b) {
           e = [];
diff --git a/dist/flexsearch.compact.min.js b/dist/flexsearch.compact.min.js
index 50c1a5b..f947a83 100644
--- a/dist/flexsearch.compact.min.js
+++ b/dist/flexsearch.compact.min.js
@@ -25,8 +25,9 @@ g||"w"===g||!(g=ma[g])||g===d||(e+=g,d=g,4!==e.length));f++);a[c]=e}}},ArabicDef
 d){for(h=d-1;0<h;h--)g=n[h]+g,k=this.score?this.score(b,n,p,g,h):N(t,e,p,d,h),O(this,m,g,k,a,c);g=""}case "forward":if(1<d){for(h=0;h<d;h++)g+=n[h],O(this,m,g,f,a,c);break}default:if(O(this,m,n,f,a,c),r&&1<e&&p<e-1)for(d=y(),g=this.S,f=n,h=Math.min(r+1,e-p),d[f]=1,k=1;k<h;k++)if((n=b[this.rtl?e-1-p-k:p+k])&&!d[n]){d[n]=1;const w=this.score?this.score(b,f,p,n,k):N(g+(e/2>g?0:1),e,p,h-1,k-1),B=this.bidirectional&&n>f;O(this,l,B?f:n,w,a,c,B?n:f)}}}}this.fastupdate||this.h.add(a)}}return this};
 function O(a,b,c,e,d,f,g){let h=g?a.D:a.map,k;b[c]&&g&&(k=b[c])[g]||(g?(b=k||(b[c]=y()),b[g]=1,(k=h.get(g))?h=k:h.set(g,h=new Map)):b[c]=1,(k=h.get(c))?h=k:h.set(c,h=[]),h=h[e]||(h[e]=[]),f&&h.includes(d)||(h.push(d),a.fastupdate&&((b=a.h.get(d))?b.push(h):a.h.set(d,[h]))))}function N(a,b,c,e,d){return c&&1<a?b+(e||0)<=a?c+(d||0):(a-1)/(b+(e||0))*(c+(d||0))+1|0:0};function Q(a,b,c){if(1===a.length)return a=a[0],a=c||a.length>b?b?a.slice(c,c+b):a.slice(c):a;let e=[];for(let d=0,f,g;d<a.length;d++)if((f=a[d])&&(g=f.length)){if(c){if(c>=g){c-=g;continue}c<g&&(f=b?f.slice(c,c+b):f.slice(c),g=f.length,c=0)}if(e.length)g>b&&(f=f.slice(0,b),g=f.length),e.push(f);else{if(g>=b)return g>b&&(f=f.slice(0,b)),f;e=[f]}b-=g;if(!b)break}return e.length?e=1<e.length?[].concat.apply([],e):e[0]:e};function ua(a,b){const c=y(),e=y(),d=[];for(let f=0;f<a.length;f++)c[a[f]]=1;for(let f=0,g;f<b.length;f++){g=b[f];for(let h=0,k;h<g.length;h++)k=g[h],c[k]&&!e[k]&&(e[k]=1,d.push(k))}return d};M.prototype.search=function(a,b,c){c||(!b&&E(a)?(c=a,a=""):E(b)&&(c=b,b=0));var e=[],d=0;if(c){a=c.query||a;b=c.limit||b;d=c.offset||0;var f=c.context;var g=c.suggest}a=this.encoder.encode(a);c=a.length;b||(b=100);if(1===c)return R.call(this,a[0],"",b,d);f=this.depth&&!1!==f;if(2===c&&f&&!g)return R.call(this,a[0],a[1],b,d);var h=0,k=0;if(1<c){var l=y();const r=[];for(let t=0,p;t<c;t++)if((p=a[t])&&!l[p]){if(g||S(this,p))r.push(p),l[p]=1;else return e;const n=p.length;h=Math.max(h,n);k=k?Math.min(k,
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-for(let r=0,t,p,n,w;r<e;r++)for(k=0;k<c;k++)if(n=a[k],r<n.length&&(t=n[r]))for(l=0;l<t.length;l++)p=t[l],(h=f[p])?f[p]++:(h=0,f[p]=1),w=g[h]||(g[h]=[]),w.push(p);if(a=g.length)if(m){e=[];for(let r=a-1,t=0,p,n;0<=r;r--)if(p=g[r],n=p.length,d>=n)d-=n;else{if(n+t>b||d)p=p.slice(d,b-t+d),n=p.length;e.push(p);t+=n;if(b===t)break}g=1<e.length?[].concat.apply([],e):e[0]}else{if(a<c){e=[];break a}g=g[a-1];if(g.length>b||d)g=g.slice(d,b+d)}e=g}return e};
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+for(let r=0,t,p,n,w;r<e;r++)for(k=0;k<c;k++)if(n=a[k],r<n.length&&(t=n[r]))for(l=0;l<t.length;l++)p=t[l],(h=f[p])?f[p]++:(h=0,f[p]=1),w=g[h]||(g[h]=[]),w.push(p);if(a=g.length)if(m){e=[];for(let r=a-1,t=0,p,n;0<=r;r--)if(p=g[r],n=p.length,d>=n)d-=n;else{if(n+t>b||d)p=p.slice(d,b-t+d),n=p.length;e.push(p);t+=n;if(b===t)break}if(1<e.length){g=e;a=[];e=y();f=g.length;for(k=0;k<f;k++)for(m=g[k],h=m.length,l=0;l<h;l++)if(c=m[l],!e[c])if(e[c]=1,d)d--;else if(a.push(c),a.length===b)break;b=a}else b=e[0];
+g=b}else{if(a<c){e=[];break a}g=g[a-1];if(g.length>b||d)g=g.slice(d,b+d)}e=g}return e};function R(a,b,c,e){return(a=S(this,a,b))&&a.length?Q(a,c,e):[]}function va(a,b,c,e,d,f,g){let h=[];if(a){e=Math.min(a.length,e);for(let k=0,l=0,m;k<e;k++)if(m=a[k])if(f&&m&&g&&(m.length<=f?(f-=m.length,m=null):(m=m.slice(f),f=0)),m&&(h[k]=m,g&&(l+=m.length,l>=d)))break;if(h.length){if(g)return Q(h,d,0);b.push(h);return}}return!c&&h}
+function S(a,b,c){let e;c&&(e=a.bidirectional&&b>c);a=c?(a=a.D.get(e?b:c))&&a.get(e?c:b):a.map.get(b);return a};M.prototype.remove=function(a,b){const c=this.h.size&&(this.fastupdate?this.h.get(a):this.h.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 T(this.map,a),this.depth&&T(this.D,a);b||this.h.delete(a)}this.cache&&this.cache.remove(a);return this};
 function T(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){const d=e[0],f=T(e[1],b);f?c+=f:a.delete(d)}return c};function M(a,b){if(!this)return new M(a);if(a){var c=z(a)?a:a.preset;c&&(a=Object.assign({},sa[c],a))}else a={};c=a.context||{};const e=a.encode||a.encoder||ja;this.encoder=e.encode?e:"object"===typeof e?new I(e):{encode:e};let d;this.resolution=a.resolution||9;this.tokenize=d=a.tokenize||"strict";this.depth="strict"===d&&c.depth||0;this.bidirectional=!1!==c.bidirectional;this.fastupdate=!!a.fastupdate;this.score=a.score||null;d=!1;this.map=new Map;this.D=new Map;this.h=b||(this.fastupdate?new Map:
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diff --git a/dist/flexsearch.compact.module.debug.js b/dist/flexsearch.compact.module.debug.js
index 989e374..0c52d0a 100644
--- a/dist/flexsearch.compact.module.debug.js
+++ b/dist/flexsearch.compact.module.debug.js
@@ -156,8 +156,8 @@ J.prototype.encode = function(a) {
     d && g && (d.length < this.minlength || this.filter && this.filter.has(d)) && (d = "");
     if (d && (this.mapper || this.dedupe && 1 < d.length)) {
       var e = "";
-      for (let h = 0, k = "", p, m; h < d.length; h++) {
-        p = d.charAt(h), p === k && this.dedupe || ((m = this.mapper && this.mapper.get(p)) || "" === m ? m === k && this.dedupe || !(k = m) || (e += m) : e += k = p);
+      for (let h = 0, k = "", n, m; h < d.length; h++) {
+        n = d.charAt(h), n === k && this.dedupe || ((m = this.mapper && this.mapper.get(n)) || "" === m ? m === k && this.dedupe || !(k = m) || (e += m) : e += k = n);
       }
       d = e;
     }
@@ -229,19 +229,19 @@ O.prototype.add = function(a, b, c, e) {
     }
     b = this.encoder.encode(b);
     if (e = b.length) {
-      const p = y(), m = y(), r = this.depth, t = this.resolution;
-      for (let n = 0; n < e; n++) {
-        let l = b[this.rtl ? e - 1 - n : n];
+      const n = y(), m = y(), r = this.depth, t = this.resolution;
+      for (let p = 0; p < e; p++) {
+        let l = b[this.rtl ? e - 1 - p : p];
         var f = l.length;
         if (f && (r || !m[l])) {
-          var d = this.score ? this.score(b, l, n, null, 0) : P(t, e, n), g = "";
+          var d = this.score ? this.score(b, l, p, null, 0) : P(t, e, p), g = "";
           switch(this.tokenize) {
             case "full":
               if (2 < f) {
                 for (d = 0; d < f; d++) {
                   for (var h = f; h > d; h--) {
                     g = l.substring(d, h);
-                    var k = this.score ? this.score(b, l, n, g, d) : P(t, e, n, f, d);
+                    var k = this.score ? this.score(b, l, p, g, d) : P(t, e, p, f, d);
                     Q(this, m, g, k, a, c);
                   }
                 }
@@ -250,7 +250,7 @@ O.prototype.add = function(a, b, c, e) {
             case "reverse":
               if (1 < f) {
                 for (h = f - 1; 0 < h; h--) {
-                  g = l[h] + g, k = this.score ? this.score(b, l, n, g, h) : P(t, e, n, f, h), Q(this, m, g, k, a, c);
+                  g = l[h] + g, k = this.score ? this.score(b, l, p, g, h) : P(t, e, p, f, h), Q(this, m, g, k, a, c);
                 }
                 g = "";
               }
@@ -262,12 +262,12 @@ O.prototype.add = function(a, b, c, e) {
                 break;
               }
             default:
-              if (Q(this, m, l, d, a, c), r && 1 < e && n < e - 1) {
-                for (f = y(), g = this.K, d = l, h = Math.min(r + 1, e - n), f[d] = 1, k = 1; k < h; k++) {
-                  if ((l = b[this.rtl ? e - 1 - n - k : n + k]) && !f[l]) {
+              if (Q(this, m, l, d, a, c), r && 1 < e && p < e - 1) {
+                for (f = y(), g = this.K, d = l, h = Math.min(r + 1, e - p), f[d] = 1, k = 1; k < h; k++) {
+                  if ((l = b[this.rtl ? e - 1 - p - k : p + k]) && !f[l]) {
                     f[l] = 1;
-                    const w = this.score ? this.score(b, d, n, l, k) : P(g + (e / 2 > g ? 0 : 1), e, n, h - 1, k - 1), B = this.bidirectional && l > d;
-                    Q(this, p, B ? d : l, w, a, c, B ? l : d);
+                    const w = this.score ? this.score(b, d, p, l, k) : P(g + (e / 2 > g ? 0 : 1), e, p, h - 1, k - 1), B = this.bidirectional && l > d;
+                    Q(this, n, B ? d : l, w, a, c, B ? l : d);
                   }
                 }
               }
@@ -351,16 +351,16 @@ function P(a, b, c, e, f) {
   }
   var h = 0, k = 0;
   if (1 < c) {
-    var p = y();
+    var n = y();
     const r = [];
-    for (let t = 0, n; t < c; t++) {
-      if ((n = a[t]) && !p[n]) {
-        if (g || T(this, n)) {
-          r.push(n), p[n] = 1;
+    for (let t = 0, p; t < c; t++) {
+      if ((p = a[t]) && !n[p]) {
+        if (g || T(this, p)) {
+          r.push(p), n[p] = 1;
         } else {
           return e;
         }
-        const l = n.length;
+        const l = p.length;
         h = Math.max(h, l);
         k = k ? Math.min(k, l) : l;
       }
@@ -371,7 +371,7 @@ function P(a, b, c, e, f) {
   if (!c) {
     return e;
   }
-  p = 0;
+  n = 0;
   if (1 === c) {
     return S.call(this, a[0], "", b, f);
   }
@@ -381,23 +381,23 @@ function P(a, b, c, e, f) {
   if (1 < c) {
     if (d) {
       var m = a[0];
-      p = 1;
+      n = 1;
     } else {
       9 < h && 3 < h / k && a.sort(aa);
     }
   }
-  for (let r, t; p < c; p++) {
-    t = a[p];
+  for (let r, t; n < c; n++) {
+    t = a[n];
     m ? (r = T(this, t, m), r = ra(r, e, g, this.K, b, f, 2 === c), g && !1 === r && e.length || (m = t)) : (r = T(this, t), r = ra(r, e, g, this.resolution, b, f, 1 === c));
     if (r) {
       return r;
     }
-    if (g && p === c - 1) {
+    if (g && n === c - 1) {
       d = e.length;
       if (!d) {
         if (m) {
           m = "";
-          p = -1;
+          n = -1;
           continue;
         }
         return e;
@@ -414,11 +414,11 @@ function P(a, b, c, e, f) {
     c = a.length;
     g = [];
     d = y();
-    for (let r = 0, t, n, l, w; r < e; r++) {
+    for (let r = 0, t, p, l, w; r < e; r++) {
       for (k = 0; k < c; k++) {
         if (l = a[k], r < l.length && (t = l[r])) {
-          for (p = 0; p < t.length; p++) {
-            n = t[p], (h = d[n]) ? d[n]++ : (h = 0, d[n] = 1), w = g[h] || (g[h] = []), w.push(n);
+          for (n = 0; n < t.length; n++) {
+            p = t[n], (h = d[p]) ? d[p]++ : (h = 0, d[p] = 1), w = g[h] || (g[h] = []), w.push(p);
           }
         }
       }
@@ -426,21 +426,43 @@ function P(a, b, c, e, f) {
     if (a = g.length) {
       if (m) {
         e = [];
-        for (let r = a - 1, t = 0, n, l; 0 <= r; r--) {
-          if (n = g[r], l = n.length, f >= l) {
+        for (let r = a - 1, t = 0, p, l; 0 <= r; r--) {
+          if (p = g[r], l = p.length, f >= l) {
             f -= l;
           } else {
             if (l + t > b || f) {
-              n = n.slice(f, b - t + f), l = n.length;
+              p = p.slice(f, b - t + f), l = p.length;
             }
-            e.push(n);
+            e.push(p);
             t += l;
             if (b === t) {
               break;
             }
           }
         }
-        g = 1 < e.length ? [].concat.apply([], e) : e[0];
+        if (1 < e.length) {
+          g = e;
+          a = [];
+          e = y();
+          d = g.length;
+          for (k = 0; k < d; k++) {
+            for (m = g[k], h = m.length, n = 0; n < h; n++) {
+              if (c = m[n], !e[c]) {
+                if (e[c] = 1, f) {
+                  f--;
+                } else {
+                  if (a.push(c), a.length === b) {
+                    break;
+                  }
+                }
+              }
+            }
+          }
+          b = a;
+        } else {
+          b = e[0];
+        }
+        g = b;
       } else {
         if (a < c) {
           e = [];
@@ -463,9 +485,9 @@ function ra(a, b, c, e, f, d, g) {
   let h = [];
   if (a) {
     e = Math.min(a.length, e);
-    for (let k = 0, p = 0, m; k < e; k++) {
+    for (let k = 0, n = 0, m; k < e; k++) {
       if (m = a[k]) {
-        if (d && m && g && (m.length <= d ? (d -= m.length, m = null) : (m = m.slice(d), d = 0)), m && (h[k] = m, g && (p += m.length, p >= f))) {
+        if (d && m && g && (m.length <= d ? (d -= m.length, m = null) : (m = m.slice(d), d = 0)), m && (h[k] = m, g && (n += m.length, n >= f))) {
           break;
         }
       }
@@ -598,8 +620,8 @@ v.cleanup = function() {
 };
 v.export = function(a, b, c, e, f, d) {
   let g = !0;
-  "undefined" === typeof d && (g = new Promise(p => {
-    d = p;
+  "undefined" === typeof d && (g = new Promise(n => {
+    d = n;
   }));
   let h, k;
   switch(f || (f = 0)) {
@@ -607,8 +629,8 @@ v.export = function(a, b, c, e, f, d) {
       h = "reg";
       if (this.fastupdate) {
         k = y();
-        for (let p of this.h.keys()) {
-          k[p] = 1;
+        for (let n of this.h.keys()) {
+          k[n] = 1;
         }
       } else {
         k = this.h;
@@ -740,19 +762,19 @@ function X(a, b, c, e, f, d, g, h) {
   c || (!b && E(a) ? (c = a, a = "") : E(b) && (c = b, b = 0));
   let f = [];
   var d = [];
-  let g, h, k, p, m;
+  let g, h, k, n, m;
   let r = 0;
   if (c) {
     c.constructor === Array && (c = {index:c});
     a = c.query || a;
     var t = c.pluck;
     h = c.merge;
-    p = t || c.field || c.index;
+    n = t || c.field || c.index;
     m = !1;
     g = this.store && c.enrich;
     k = c.suggest;
     b = c.limit || b;
-    var n = c.offset || 0;
+    var p = c.offset || 0;
     b || (b = 100);
     if (m) {
       m.constructor !== Array && (m = [m]);
@@ -792,7 +814,7 @@ function X(a, b, c, e, f, d, g, h) {
         e = [];
         if (l.length) {
           for (d = 0; d < l.length; d += 2) {
-            t = sa.call(this, l[d], l[d + 1], b, n, g), f.push({field:l[d], tag:l[d + 1], result:t});
+            t = sa.call(this, l[d], l[d + 1], b, p, g), f.push({field:l[d], tag:l[d + 1], result:t});
           }
         }
         return e.length ? Promise.all(e).then(function(u) {
@@ -803,19 +825,19 @@ function X(a, b, c, e, f, d, g, h) {
         }) : f;
       }
     }
-    z(p) && (p = [p]);
+    z(n) && (n = [n]);
   }
-  p || (p = this.field);
-  n = !e && (this.worker || this.async) && [];
-  for (let u = 0, q, C, D; u < p.length; u++) {
-    C = p[u];
+  n || (n = this.field);
+  p = !e && (this.worker || this.async) && [];
+  for (let u = 0, q, C, D; u < n.length; u++) {
+    C = n[u];
     let A;
     z(C) || (A = C, C = A.field, a = A.query || a, b = A.limit || b, k = A.suggest || k);
     if (e) {
       q = e[u];
     } else {
-      if (l = A || c, w = this.index.get(C), m && (l.enrich = !1), n) {
-        n[u] = w.searchAsync(a, b, l);
+      if (l = A || c, w = this.index.get(C), m && (l.enrich = !1), p) {
+        p[u] = w.searchAsync(a, b, l);
         l && g && (l.enrich = g);
         continue;
       } else {
@@ -852,13 +874,13 @@ function X(a, b, c, e, f, d, g, h) {
     }
     if (D) {
       d[r] = C, f.push(q), r++;
-    } else if (1 === p.length) {
+    } else if (1 === n.length) {
       return f;
     }
   }
-  if (n) {
+  if (p) {
     const u = this;
-    return Promise.all(n).then(function(q) {
+    return Promise.all(p).then(function(q) {
       return q.length ? u.search(a, b, c, q) : q;
     });
   }
@@ -868,7 +890,7 @@ function X(a, b, c, e, f, d, g, h) {
   if (t && (!g || !this.store)) {
     return f[0];
   }
-  n = [];
+  p = [];
   for (let u = 0, q; u < d.length; u++) {
     q = f[u];
     g && q.length && !q[0].doc && q.length && (q = ta.call(this, q));
@@ -884,15 +906,15 @@ function va(a, b) {
   for (let f = 0, d, g; f < a.length; f++) {
     d = a[f];
     g = d.result;
-    for (let h = 0, k, p, m; h < g.length; h++) {
-      if (p = g[h], k = p.id, m = e[k]) {
+    for (let h = 0, k, n, m; h < g.length; h++) {
+      if (n = g[h], k = n.id, m = e[k]) {
         m.push(d.field);
       } else {
         if (c.length === b) {
           return c;
         }
-        p.field = e[k] = [d.field];
-        c.push(p);
+        n.field = e[k] = [d.field];
+        c.push(n);
       }
     }
   }
diff --git a/dist/flexsearch.compact.module.min.js b/dist/flexsearch.compact.module.min.js
index f2f83ac..3c8e7bf 100644
--- a/dist/flexsearch.compact.module.min.js
+++ b/dist/flexsearch.compact.module.min.js
@@ -17,25 +17,26 @@ I.prototype.assign=function(a){this.normalize=x(a.normalize,!0,this.normalize);l
 x(a.prepare,null,this.prepare);this.finalize=x(a.finalize,null,this.finalize);H||(this.mapper=new Map(ba));this.rtl=a.rtl||!1;this.dedupe=x(a.dedupe,!0,this.dedupe);this.filter=x((c=a.filter)&&new Set(c),null,this.filter);this.matcher=x((c=a.matcher)&&new Map(c),null,this.matcher);this.mapper=x((c=a.mapper)&&new Map(c),null,this.mapper);this.stemmer=x((c=a.stemmer)&&new Map(c),null,this.stemmer);this.replacer=x(a.replacer,null,this.replacer);this.minlength=x(a.minlength,1,this.minlength);this.maxlength=
 x(a.maxlength,0,this.maxlength);this.F="";this.H=null;this.D="";this.I=null;if(this.matcher)for(const d of this.matcher.keys())this.F+=(this.F?"|":"")+d;if(this.stemmer)for(const d of this.stemmer.keys())this.D+=(this.D?"|":"")+d;return this};
 I.prototype.encode=function(a){this.normalize&&(a="function"===typeof this.normalize?this.normalize(a):H?a.normalize("NFKD").replace(H,"").toLowerCase():a.toLowerCase());this.prepare&&(a=this.prepare(a));this.numeric&&3<a.length&&(a=a.replace(ea,"$1 $2").replace(fa,"$1 $2").replace(da,"$1 "));const b=!(this.dedupe||this.mapper||this.filter||this.matcher||this.stemmer||this.replacer);let c=[];a=this.split||""===this.split?a.split(this.split):a;for(let e=0,f;e<a.length;e++){if(!(f=a[e]))continue;if(f.length<
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+function X(a,b,c,d,e,f,g,h){if(a=a[g])if(d===b.length-1){if(a.constructor===Array){if(c[d]){for(b=0;b<a.length;b++)e.add(f,a[b],!0,!0);return}a=a.join(" ")}e.add(f,a,h,!0)}else if(a.constructor===Array)for(g=0;g<a.length;g++)X(a,b,c,d,e,f,g,h);else g=b[++d],X(a,b,c,d,e,f,g,h)};W.prototype.search=function(a,b,c,d){c||(!b&&E(a)?(c=a,a=""):E(b)&&(c=b,b=0));let e=[];var f=[];let g,h,k,n,m;let r=0;if(c){c.constructor===Array&&(c={index:c});a=c.query||a;var t=c.pluck;h=c.merge;n=t||c.field||c.index;m=!1;g=this.store&&c.enrich;k=c.suggest;b=c.limit||b;var p=c.offset||0;b||(b=100);if(m){m.constructor!==Array&&(m=[m]);var l=[];for(let u=0,q;u<m.length;u++)if(q=m[u],q.field&&q.tag){var w=q.tag;if(w.constructor===Array)for(var B=0;B<w.length;B++)l.push(q.field,w[B]);else l.push(q.field,
+w)}else{w=Object.keys(q);for(let C=0,D,z;C<w.length;C++)if(D=w[C],z=q[D],z.constructor===Array)for(B=0;B<z.length;B++)l.push(D,z[B]);else l.push(D,z)}m=l;if(!a){d=[];if(l.length)for(f=0;f<l.length;f+=2)t=sa.call(this,l[f],l[f+1],b,p,g),e.push({field:l[f],tag:l[f+1],result:t});return d.length?Promise.all(d).then(function(u){for(let q=0;q<u.length;q++)e[q].result=u[q];return e}):e}}A(n)&&(n=[n])}n||(n=this.field);p=!d&&(this.worker||this.async)&&[];for(let u=0,q,C,D;u<n.length;u++){C=n[u];let z;A(C)||
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+n.length)return e}if(p){const u=this;return Promise.all(p).then(function(q){return q.length?u.search(a,b,c,q):q})}if(!r)return e;if(t&&(!g||!this.store))return e[0];p=[];for(let u=0,q;u<f.length;u++){q=e[u];g&&q.length&&!q[0].doc&&q.length&&(q=ta.call(this,q));if(t)return q;e[u]={field:f[u],result:q}}return h?va(e,b):e};
+function va(a,b){const c=[],d=y();for(let e=0,f,g;e<a.length;e++){f=a[e];g=f.result;for(let h=0,k,n,m;h<g.length;h++)if(n=g[h],k=n.id,m=d[k])m.push(f.field);else{if(c.length===b)return c;n.field=d[k]=[f.field];c.push(n)}}return c}function sa(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=ta.call(this,a));return a}}
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diff --git a/dist/flexsearch.es5.debug.js b/dist/flexsearch.es5.debug.js
index 1c82758..abe1d30 100644
--- a/dist/flexsearch.es5.debug.js
+++ b/dist/flexsearch.es5.debug.js
@@ -41,7 +41,7 @@ function ca(a) {
   throw Error("Cannot find global object");
 }
 var z = ca(this);
-function C(a, b) {
+function B(a, b) {
   if (b) {
     a: {
       var c = z;
@@ -207,7 +207,7 @@ function ra(a) {
 function sa(a) {
   return ra(new pa(new ma(a)));
 }
-C("Symbol", function(a) {
+B("Symbol", function(a) {
   function b(g) {
     if (this instanceof b) {
       throw new TypeError("Symbol is not a constructor");
@@ -227,7 +227,7 @@ C("Symbol", function(a) {
   var d = "jscomp_symbol_" + (1E9 * Math.random() >>> 0) + "_", e = 0;
   return b;
 });
-C("Symbol.iterator", function(a) {
+B("Symbol.iterator", function(a) {
   if (a) {
     return a;
   }
@@ -247,7 +247,7 @@ function ta(a) {
   };
   return a;
 }
-C("Promise", function(a) {
+B("Promise", function(a) {
   function b(f) {
     this.A = 0;
     this.C = void 0;
@@ -489,7 +489,7 @@ function ua(a, b) {
   };
   return e;
 }
-C("Array.prototype.values", function(a) {
+B("Array.prototype.values", function(a) {
   return a ? a : function() {
     return ua(this, function(b, c) {
       return c;
@@ -499,7 +499,7 @@ C("Array.prototype.values", function(a) {
 function H(a, b) {
   return Object.prototype.hasOwnProperty.call(a, b);
 }
-C("WeakMap", function(a) {
+B("WeakMap", function(a) {
   function b(k) {
     this.h = (h += Math.random() + 1).toString();
     if (k) {
@@ -576,7 +576,7 @@ C("WeakMap", function(a) {
   };
   return b;
 });
-C("Map", function(a) {
+B("Map", function(a) {
   function b() {
     var h = {};
     return h.K = h.next = h.head = h;
@@ -689,14 +689,14 @@ C("Map", function(a) {
   var f = 0;
   return e;
 });
-C("Array.prototype.keys", function(a) {
+B("Array.prototype.keys", function(a) {
   return a ? a : function() {
     return ua(this, function(b) {
       return b;
     });
   };
 });
-C("Set", function(a) {
+B("Set", function(a) {
   function b(c) {
     this.h = new Map();
     if (c) {
@@ -762,12 +762,12 @@ C("Set", function(a) {
   };
   return b;
 });
-C("Object.is", function(a) {
+B("Object.is", function(a) {
   return a ? a : function(b, c) {
     return b === c ? 0 !== b || 1 / b === 1 / c : b !== b && c !== c;
   };
 });
-C("Array.prototype.includes", function(a) {
+B("Array.prototype.includes", function(a) {
   return a ? a : function(b, c) {
     var d = this;
     d instanceof String && (d = String(d));
@@ -782,7 +782,7 @@ C("Array.prototype.includes", function(a) {
     return !1;
   };
 });
-C("String.prototype.includes", function(a) {
+B("String.prototype.includes", function(a) {
   return a ? a : function(b, c) {
     if (null == this) {
       throw new TypeError("The 'this' value for String.prototype.includes must not be null or undefined");
@@ -793,7 +793,7 @@ C("String.prototype.includes", function(a) {
     return -1 !== this.indexOf(b, c || 0);
   };
 });
-C("Array.prototype.entries", function(a) {
+B("Array.prototype.entries", function(a) {
   return a ? a : function() {
     return ua(this, function(b, c) {
       return [b, c];
@@ -811,10 +811,10 @@ var va = "function" == typeof Object.assign ? Object.assign : function(a, b) {
   }
   return a;
 };
-C("Object.assign", function(a) {
+B("Object.assign", function(a) {
   return a || va;
 });
-C("Array.prototype.flat", function(a) {
+B("Array.prototype.flat", function(a) {
   return a ? a : function(b) {
     b = void 0 === b ? 1 : b;
     var c = [];
@@ -1883,7 +1883,28 @@ function ib(a, b, c, d, e) {
           }
         }
       }
-      f = 1 < e.length ? [].concat.apply([], e) : e[0];
+      if (1 < e.length) {
+        f = [];
+        g = K();
+        k = e.length;
+        for (m = 0; m < k; m++) {
+          for (a = e[m], l = a.length, p = 0; p < l; p++) {
+            if (b = a[p], !g[b]) {
+              if (g[b] = 1, d) {
+                d--;
+              } else {
+                if (f.push(b), f.length === c) {
+                  break;
+                }
+              }
+            }
+          }
+        }
+        c = f;
+      } else {
+        c = e[0];
+      }
+      f = c;
     } else {
       if (a < g) {
         return [];
@@ -1975,7 +1996,7 @@ V.prototype.search = function(a, b, c) {
     }
     var v = this;
     return function() {
-      var A, D, B;
+      var A, D, C;
       return sa(function(E) {
         switch(E.h) {
           case 1:
@@ -1999,8 +2020,8 @@ V.prototype.search = function(a, b, c) {
               return E.return(A);
             }
             if (h && u === m - 1) {
-              B = d.length;
-              if (!B) {
+              C = d.length;
+              if (!C) {
                 if (t) {
                   t = "";
                   u = -1;
@@ -2009,7 +2030,7 @@ V.prototype.search = function(a, b, c) {
                 }
                 return E.return(d);
               }
-              if (1 === B) {
+              if (1 === C) {
                 return E.return(g ? W(d[0], b, e) : new X(d[0]));
               }
             }
@@ -2513,8 +2534,8 @@ function tb(a, b, c, d, e, g, f, h) {
           v = 0;
           for (var A = void 0, D = void 0; v < t.length; v++) {
             if (A = t[v], D = u[A], D.constructor === Array) {
-              for (var B = 0; B < D.length; B++) {
-                r.push(A, D[B]);
+              for (var C = 0; C < D.length; C++) {
+                r.push(A, D[C]);
               }
             } else {
               r.push(A, D);
@@ -2588,8 +2609,8 @@ function tb(a, b, c, d, e, g, f, h) {
         D = 0;
         if (this.db && d) {
           if (!E) {
-            for (B = l.length; B < d.length; B++) {
-              var J = d[B];
+            for (C = l.length; C < d.length; C++) {
+              var J = d[C];
               if (J && J.length) {
                 D++, A.push(J);
               } else if (!p) {
@@ -2598,17 +2619,17 @@ function tb(a, b, c, d, e, g, f, h) {
             }
           }
         } else {
-          B = 0;
-          for (var Gb = J = void 0; B < m.length; B += 2) {
-            J = this.tag.get(m[B]);
+          C = 0;
+          for (var Gb = J = void 0; C < m.length; C += 2) {
+            J = this.tag.get(m[C]);
             if (!J) {
-              if (console.warn("Tag '" + m[B] + ":" + m[B + 1] + "' will be skipped because there is no field '" + m[B] + "'."), p) {
+              if (console.warn("Tag '" + m[C] + ":" + m[C + 1] + "' will be skipped because there is no field '" + m[C] + "'."), p) {
                 continue;
               } else {
                 return e;
               }
             }
-            if (Gb = (J = J && J.get(m[B + 1])) && J.length) {
+            if (Gb = (J = J && J.get(m[C + 1])) && J.length) {
               D++, A.push(J);
             } else if (!p) {
               return e;
@@ -3172,8 +3193,8 @@ w.commit = function(a, b, c) {
                     for (var v = Math.max(u.length, r.T.length), A = 0, D; A < v; A++) {
                       if ((D = r.T[A]) && D.length) {
                         if ((t = u[A]) && t.length) {
-                          for (var B = 0; B < D.length; B++) {
-                            t.push(D[B]);
+                          for (var C = 0; C < D.length; C++) {
+                            t.push(D[C]);
                           }
                         } else {
                           u[A] = D;
diff --git a/dist/flexsearch.es5.min.js b/dist/flexsearch.es5.min.js
index 6b00621..5dc68ab 100644
--- a/dist/flexsearch.es5.min.js
+++ b/dist/flexsearch.es5.min.js
@@ -70,8 +70,8 @@ function eb(a,b,c,d,e){if(2>a.length)return[];var g=[],f=0,h=K(),k=za(a);if(!k)r
 f=l.enrich;h=l.resolve;continue}d[k]=m;m.then&&c.push(m)}if(c.length)return Promise.all(c).then(function(){a.result.length&&(d=[a.result].concat(d));a.result=fb(d,e,g,f,!h,a.M);return h?a.result:a});this.result.length&&(d=[this.result].concat(d));this.result=fb(d,e,g,f,!h,a.M);return h?this.result:this};
 function fb(a,b,c,d,e,g){if(!a.length)return a;if(2>a.length)return e?W(a[0],b,c,d):a[0];b=[];c=K();d=0;for(var f;d<a.length;d++)if(f=a[d])for(var h=0,k;h<f.length;h++)if(k=f[h])for(var l=0,m;l<k.length;l++)m=k[l],c[m]?c[m]++:c[m]=1;for(d=0;d<a.length;d++)if(f=a[d])for(h=0;h<f.length;h++)if(k=f[h])for(l=0;l<k.length;l++)if(m=k[l],1===c[m])if(e)b.push(m);else{var n=h+(d?g:0);b[n]||(b[n]=[]);b[n].push(m)}return b};X.prototype.not=function(){var a=this,b=arguments,c=b[0];if(c.then)return c.then(function(){return a.not.apply(a,b)});if(c[0]&&c[0].index)return this.not.apply(this,c);var d=[];c=[];for(var e,g=0,f=void 0;g<b.length;g++)if(f=b[g]){var h=void 0;if(f.constructor===X)h=f.result;else if(f.constructor===Array)h=f;else if(f.index)f.resolve=!1,h=f.index.search(f).result;else if(f.or)h=this.or(f.or);else if(f.and)h=this.and(f.and);else if(f.xor)h=this.xor(f.xor);else{e=f.resolve;continue}d[g]=h;h.then&&c.push(h)}if(c.length)return Promise.all(c).then(function(){a.result=
 gb.call(a,d,e);return e?a.result:a});this.result=gb.call(this,d,e);return e?this.result:this};function gb(a,b){if(!a.length)return this.result;var c=[];a=new Set(a.flat().flat());for(var d=0,e;d<this.result.length;d++)if(e=this.result[d])for(var g=0,f;g<e.length;g++)f=e[g],a.has(f)||(b?c.push(f):(c[d]||(c[d]=[]),c[d].push(f)));return c};function X(a){if(!this)return new X(a);if(a&&a.index)return a.resolve=!1,this.index=a.index,a.index.search(a);if(a.constructor===X)return a;this.index=null;this.result=a||[];this.M=0}X.prototype.limit=function(a){if(this.result.length)for(var b=[],c=0,d=0,e;d<this.result.length;d++)if(e=this.result[d],e.length+c<a)b[d]=e,c+=e.length;else{b[d]=e.slice(0,a-c);this.result=b;break}return this};
-X.prototype.offset=function(a){if(this.result.length){for(var b=[],c=0,d=0,e;d<this.result.length;d++)e=this.result[d],e.length+c<a?c+=e.length:(b[d]=e.slice(a-c),c=a);this.result=b}return this};X.prototype.boost=function(a){this.M+=a;return this};X.prototype.resolve=function(a,b,c){hb=1;var d=this.result;this.result=this.index=null;return d.length?("object"===typeof a&&(c=a.enrich,b=a.offset,a=a.limit),W(d,a||100,b,c)):d};function ib(a,b,c,d,e){var g=a.length,f=[],h;var k=K();for(var l=0,m=void 0,n;l<b;l++)for(var p=0;p<g;p++)if(n=a[p],l<n.length&&(m=n[l]))for(var q=0;q<m.length;q++)n=m[q],(h=k[n])?k[n]++:(h=0,k[n]=1),h=f[h]||(f[h]=[]),h.push(n);if(a=f.length)if(e){e=[];g=a-1;for(a=0;0<=g;g--)if(b=f[g],k=b.length,d>=k)d-=k;else{if(k+a>c||d)b=b.slice(d,c-a+d),k=b.length;e.push(b);a+=k;if(c===a)break}f=1<e.length?[].concat.apply([],e):e[0]}else{if(a<g)return[];f=f[a-1];if(f.length>c||d)f=f.slice(d,c+d)}return f}
-function jb(a,b){for(var c=K(),d=K(),e=[],g=0;g<a.length;g++)c[a[g]]=1;for(a=0;a<b.length;a++){g=b[a];for(var f=0,h;f<g.length;f++)h=g[f],c[h]&&!d[h]&&(d[h]=1,e.push(h))}return e};var hb=1;
+X.prototype.offset=function(a){if(this.result.length){for(var b=[],c=0,d=0,e;d<this.result.length;d++)e=this.result[d],e.length+c<a?c+=e.length:(b[d]=e.slice(a-c),c=a);this.result=b}return this};X.prototype.boost=function(a){this.M+=a;return this};X.prototype.resolve=function(a,b,c){hb=1;var d=this.result;this.result=this.index=null;return d.length?("object"===typeof a&&(c=a.enrich,b=a.offset,a=a.limit),W(d,a||100,b,c)):d};function ib(a,b,c,d,e){var g=a.length,f=[],h;var k=K();for(var l=0,m=void 0,n;l<b;l++)for(var p=0;p<g;p++)if(n=a[p],l<n.length&&(m=n[l]))for(var q=0;q<m.length;q++)n=m[q],(h=k[n])?k[n]++:(h=0,k[n]=1),h=f[h]||(f[h]=[]),h.push(n);if(a=f.length)if(e){e=[];g=a-1;for(a=0;0<=g;g--)if(b=f[g],k=b.length,d>=k)d-=k;else{if(k+a>c||d)b=b.slice(d,c-a+d),k=b.length;e.push(b);a+=k;if(c===a)break}if(1<e.length){f=[];g=K();k=e.length;for(m=0;m<k;m++)for(a=e[m],l=a.length,p=0;p<l;p++)if(b=a[p],!g[b])if(g[b]=1,d)d--;
+else if(f.push(b),f.length===c)break;c=f}else c=e[0];f=c}else{if(a<g)return[];f=f[a-1];if(f.length>c||d)f=f.slice(d,c+d)}return f}function jb(a,b){for(var c=K(),d=K(),e=[],g=0;g<a.length;g++)c[a[g]]=1;for(a=0;a<b.length;a++){g=b[a];for(var f=0,h;f<g.length;f++)h=g[f],c[h]&&!d[h]&&(d[h]=1,e.push(h))}return e};var hb=1;
 V.prototype.search=function(a,b,c){c||(!b&&M(a)?(c=a,a=""):M(b)&&(c=b,b=0));var d=[],e=0,g;if(c){a=c.query||a;b=c.limit||b;e=c.offset||0;var f=c.context;var h=c.suggest;(g=hb&&!1!==c.resolve)||(hb=0);var k=g&&c.enrich;var l=this.db&&c.tag}else g=this.resolve||hb;a=this.encoder.encode(a);var m=a.length;b||!g||(b=100);if(1===m)return kb.call(this,a[0],"",b,e,g,k,l);f=this.depth&&!1!==f;if(2===m&&f&&!h)return kb.call(this,a[0],a[1],b,e,g,k,l);var n=c=0;if(1<m){for(var p=K(),q=[],r=0,y=void 0;r<m;r++)if((y=
 a[r])&&!p[y]){if(h||this.db||Y(this,y))q.push(y),p[y]=1;else return g?d:new X(d);y=y.length;c=Math.max(c,y);n=n?Math.min(n,y):y}a=q;m=a.length}if(!m)return g?d:new X(d);var u=0;if(1===m)return kb.call(this,a[0],"",b,e,g,k,l);if(2===m&&f&&!h)return kb.call(this,a[0],a[1],b,e,g,k,l);if(1<m)if(f){var t=a[0];u=1}else 9<c&&3<c/n&&a.sort(wa);if(this.db){if(this.db.search&&(f=this.db.search(this,a,b,e,h,g,k,l),!1!==f))return f;var v=this;return function(){var A,C,D;return sa(function(E){switch(E.h){case 1:C=
 A=void 0;case 2:if(!(u<m)){E.h=4;break}C=a[u];return t?F(E,Y(v,C,t),8):F(E,Y(v,C),7);case 7:A=E.G;A=lb(A,d,h,v.resolution,b,e,1===m);E.h=6;break;case 8:A=E.G,A=lb(A,d,h,v.da,b,e,2===m),h&&!1===A&&d.length||(t=C);case 6:if(A)return E.return(A);if(h&&u===m-1){D=d.length;if(!D){if(t){t="";u=-1;E.h=3;break}return E.return(d)}if(1===D)return E.return(g?W(d[0],b,e):new X(d[0]))}case 3:u++;E.h=2;break;case 4:return E.return(g?ib(d,v.resolution,b,e,h):new X(d[0]))}})}()}for(k=f=void 0;u<m;u++){k=a[u];t?(f=
diff --git a/dist/flexsearch.light.debug.js b/dist/flexsearch.light.debug.js
index d762560..755e449 100644
--- a/dist/flexsearch.light.debug.js
+++ b/dist/flexsearch.light.debug.js
@@ -43,19 +43,22 @@ function t(a, c, b) {
   }
   return "undefined" === e ? c : a;
 }
-function u(a, c) {
+function u() {
+  return Object.create(null);
+}
+function v(a, c) {
   return c.length - a.length;
 }
-;const v = /[^\p{L}\p{N}]+/u, w = /(\d{3})/g, x = /(\D)(\d{3})/g, y = /(\d{3})(\D)/g, A = "".normalize && /[\u0300-\u036f]/g;
-function B(a) {
+;const w = /[^\p{L}\p{N}]+/u, x = /(\d{3})/g, y = /(\D)(\d{3})/g, z = /(\d{3})(\D)/g, B = "".normalize && /[\u0300-\u036f]/g;
+function C(a) {
   if (!this) {
-    return new B(...arguments);
+    return new C(...arguments);
   }
   for (let c = 0; c < arguments.length; c++) {
     this.assign(arguments[c]);
   }
 }
-B.prototype.assign = function(a) {
+C.prototype.assign = function(a) {
   this.normalize = t(a.normalize, !0, this.normalize);
   let c = a.include, b = c || a.exclude || a.split;
   if ("object" === typeof b) {
@@ -72,7 +75,7 @@ B.prototype.assign = function(a) {
     this.split = new RegExp("[" + (c ? "^" : "") + e + "]+", "u");
     this.numeric = d;
   } else {
-    this.split = t(b, v, this.split), this.numeric = t(this.numeric, !0);
+    this.split = t(b, w, this.split), this.numeric = t(this.numeric, !0);
   }
   this.prepare = t(a.prepare, null, this.prepare);
   this.finalize = t(a.finalize, null, this.finalize);
@@ -104,19 +107,19 @@ B.prototype.assign = function(a) {
   }
   return this;
 };
-B.prototype.encode = function(a) {
+C.prototype.encode = function(a) {
   if (this.cache && a.length <= this.h) {
     if (this.m) {
       if (this.i.has(a)) {
         return this.i.get(a);
       }
     } else {
-      this.m = setTimeout(C, 0, this);
+      this.m = setTimeout(D, 0, this);
     }
   }
-  this.normalize && (a = "function" === typeof this.normalize ? this.normalize(a) : A ? a.normalize("NFKD").replace(A, "").toLowerCase() : a.toLowerCase());
+  this.normalize && (a = "function" === typeof this.normalize ? this.normalize(a) : B ? a.normalize("NFKD").replace(B, "").toLowerCase() : a.toLowerCase());
   this.prepare && (a = this.prepare(a));
-  this.numeric && 3 < a.length && (a = a.replace(x, "$1 $2").replace(y, "$1 $2").replace(w, "$1 "));
+  this.numeric && 3 < a.length && (a = a.replace(y, "$1 $2").replace(z, "$1 $2").replace(x, "$1 "));
   const c = !(this.dedupe || this.mapper || this.filter || this.matcher || this.stemmer || this.replacer);
   let b = [], d = this.split || "" === this.split ? a.split(this.split) : a;
   for (let g = 0, f, h; g < d.length; g++) {
@@ -141,17 +144,17 @@ B.prototype.encode = function(a) {
           continue;
         }
       } else {
-        this.m = setTimeout(C, 0, this);
+        this.m = setTimeout(D, 0, this);
       }
     }
-    let l;
-    this.stemmer && 2 < f.length && (this.A || (this.A = new RegExp("(?!^)(" + this.u + ")$")), f = f.replace(this.A, r => this.stemmer.get(r)), l = 1);
-    this.matcher && 1 < f.length && (this.v || (this.v = new RegExp("(" + this.s + ")", "g")), f = f.replace(this.v, r => this.matcher.get(r)), l = 1);
-    f && l && (f.length < this.minlength || this.filter && this.filter.has(f)) && (f = "");
+    let k;
+    this.stemmer && 2 < f.length && (this.A || (this.A = new RegExp("(?!^)(" + this.u + ")$")), f = f.replace(this.A, p => this.stemmer.get(p)), k = 1);
+    this.matcher && 1 < f.length && (this.v || (this.v = new RegExp("(" + this.s + ")", "g")), f = f.replace(this.v, p => this.matcher.get(p)), k = 1);
+    f && k && (f.length < this.minlength || this.filter && this.filter.has(f)) && (f = "");
     if (f && (this.mapper || this.dedupe && 1 < f.length)) {
       e = "";
-      for (let r = 0, p = "", n, q; r < f.length; r++) {
-        n = f.charAt(r), n === p && this.dedupe || ((q = this.mapper && this.mapper.get(n)) || "" === q ? q === p && this.dedupe || !(p = q) || (e += q) : e += p = n);
+      for (let p = 0, m = "", q, r; p < f.length; p++) {
+        q = f.charAt(p), q === m && this.dedupe || ((r = this.mapper && this.mapper.get(q)) || "" === r ? r === m && this.dedupe || !(m = r) || (e += r) : e += m = q);
       }
       f = e;
     }
@@ -167,61 +170,61 @@ B.prototype.encode = function(a) {
   this.cache && a.length <= this.h && (this.i.set(a, b), this.i.size > this.B && (this.i.clear(), this.h = this.h / 1.1 | 0));
   return b;
 };
-function C(a) {
+function D(a) {
   a.m = null;
   a.i.clear();
   a.j.clear();
 }
-;function D(a) {
+;function E(a) {
   this.limit = a && !0 !== a ? a : 1000;
   this.cache = new Map();
   this.h = "";
 }
-D.prototype.set = function(a, c) {
+E.prototype.set = function(a, c) {
   this.cache.set(this.h = a, c);
   this.cache.size > this.limit && this.cache.delete(this.cache.keys().next().value);
 };
-D.prototype.get = function(a) {
+E.prototype.get = function(a) {
   const c = this.cache.get(a);
   c && this.h !== a && (this.cache.delete(a), this.cache.set(this.h = a, c));
   return c;
 };
-D.prototype.remove = function(a) {
+E.prototype.remove = function(a) {
   for (const c of this.cache) {
     const b = c[0];
     c[1].includes(a) && this.cache.delete(b);
   }
 };
-D.prototype.clear = function() {
+E.prototype.clear = function() {
   this.cache.clear();
   this.h = "";
 };
-const E = {normalize:function(a) {
+const F = {normalize:function(a) {
   return a.toLowerCase();
 }, dedupe:!1};
-const F = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
-Object.create(null);
-G.prototype.add = function(a, c, b, d) {
+const G = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
+u();
+H.prototype.add = function(a, c, b, d) {
   if (c && (a || 0 === a)) {
     if (!d && !b && this.g.has(a)) {
       return this.update(a, c);
     }
     c = this.encoder.encode(c);
     if (d = c.length) {
-      const r = Object.create(null), p = Object.create(null), n = this.depth, q = this.resolution;
-      for (let k = 0; k < d; k++) {
-        let m = c[this.rtl ? d - 1 - k : k];
-        var e = m.length;
-        if (e && (n || !p[m])) {
-          var g = this.score ? this.score(c, m, k, null, 0) : H(q, d, k), f = "";
+      const p = u(), m = u(), q = this.depth, r = this.resolution;
+      for (let l = 0; l < d; l++) {
+        let n = c[this.rtl ? d - 1 - l : l];
+        var e = n.length;
+        if (e && (q || !m[n])) {
+          var g = this.score ? this.score(c, n, l, null, 0) : I(r, d, l), f = "";
           switch(this.tokenize) {
             case "full":
               if (2 < e) {
                 for (g = 0; g < e; g++) {
                   for (var h = e; h > g; h--) {
-                    f = m.substring(g, h);
-                    var l = this.score ? this.score(c, m, k, f, g) : H(q, d, k, e, g);
-                    I(this, p, f, l, a, b);
+                    f = n.substring(g, h);
+                    var k = this.score ? this.score(c, n, l, f, g) : I(r, d, l, e, g);
+                    J(this, m, f, k, a, b);
                   }
                 }
                 break;
@@ -229,24 +232,24 @@ G.prototype.add = function(a, c, b, d) {
             case "reverse":
               if (1 < e) {
                 for (h = e - 1; 0 < h; h--) {
-                  f = m[h] + f, l = this.score ? this.score(c, m, k, f, h) : H(q, d, k, e, h), I(this, p, f, l, a, b);
+                  f = n[h] + f, k = this.score ? this.score(c, n, l, f, h) : I(r, d, l, e, h), J(this, m, f, k, a, b);
                 }
                 f = "";
               }
             case "forward":
               if (1 < e) {
                 for (h = 0; h < e; h++) {
-                  f += m[h], I(this, p, f, g, a, b);
+                  f += n[h], J(this, m, f, g, a, b);
                 }
                 break;
               }
             default:
-              if (I(this, p, m, g, a, b), n && 1 < d && k < d - 1) {
-                for (e = Object.create(null), f = this.C, g = m, h = Math.min(n + 1, d - k), e[g] = 1, l = 1; l < h; l++) {
-                  if ((m = c[this.rtl ? d - 1 - k - l : k + l]) && !e[m]) {
-                    e[m] = 1;
-                    const z = this.score ? this.score(c, g, k, m, l) : H(f + (d / 2 > f ? 0 : 1), d, k, h - 1, l - 1), L = this.bidirectional && m > g;
-                    I(this, r, L ? g : m, z, a, b, L ? m : g);
+              if (J(this, m, n, g, a, b), q && 1 < d && l < d - 1) {
+                for (e = u(), f = this.C, g = n, h = Math.min(q + 1, d - l), e[g] = 1, k = 1; k < h; k++) {
+                  if ((n = c[this.rtl ? d - 1 - l - k : l + k]) && !e[n]) {
+                    e[n] = 1;
+                    const A = this.score ? this.score(c, g, l, n, k) : I(f + (d / 2 > f ? 0 : 1), d, l, h - 1, k - 1), M = this.bidirectional && n > g;
+                    J(this, p, M ? g : n, A, a, b, M ? n : g);
                   }
                 }
               }
@@ -258,14 +261,14 @@ G.prototype.add = function(a, c, b, d) {
   }
   return this;
 };
-function I(a, c, b, d, e, g, f) {
-  let h = f ? a.l : a.map, l;
-  c[b] && f && (l = c[b])[f] || (f ? (c = l || (c[b] = Object.create(null)), c[f] = 1, (l = h.get(f)) ? h = l : h.set(f, h = new Map())) : c[b] = 1, (l = h.get(b)) ? h = l : h.set(b, h = []), h = h[d] || (h[d] = []), g && h.includes(e) || (h.push(e), a.fastupdate && ((c = a.g.get(e)) ? c.push(h) : a.g.set(e, [h]))));
+function J(a, c, b, d, e, g, f) {
+  let h = f ? a.l : a.map, k;
+  c[b] && f && (k = c[b])[f] || (f ? (c = k || (c[b] = u()), c[f] = 1, (k = h.get(f)) ? h = k : h.set(f, h = new Map())) : c[b] = 1, (k = h.get(b)) ? h = k : h.set(b, h = []), h = h[d] || (h[d] = []), g && h.includes(e) || (h.push(e), a.fastupdate && ((c = a.g.get(e)) ? c.push(h) : a.g.set(e, [h]))));
 }
-function H(a, c, b, d, e) {
+function I(a, c, b, d, e) {
   return b && 1 < a ? c + (d || 0) <= a ? b + (e || 0) : (a - 1) / (c + (d || 0)) * (b + (e || 0)) + 1 | 0 : 0;
 }
-;function J(a, c, b) {
+;function K(a, c, b) {
   if (1 === a.length) {
     return a = a[0], a = b || a.length > c ? c ? a.slice(b, b + c) : a.slice(b) : a;
   }
@@ -295,7 +298,7 @@ function H(a, c, b, d, e) {
   }
   return d.length ? d = 1 < d.length ? [].concat.apply([], d) : d[0] : d;
 }
-;G.prototype.search = function(a, c, b) {
+;H.prototype.search = function(a, c, b) {
   b || (c || "object" !== typeof a ? "object" === typeof c && (b = c, c = 0) : (b = a, a = ""));
   var d = [], e = 0;
   if (b) {
@@ -309,104 +312,126 @@ function H(a, c, b, d, e) {
   b = a.length;
   c || (c = 100);
   if (1 === b) {
-    return K.call(this, a[0], "", c, e);
+    return L.call(this, a[0], "", c, e);
   }
   g = this.depth && !1 !== g;
   if (2 === b && g && !f) {
-    return K.call(this, a[0], a[1], c, e);
+    return L.call(this, a[0], a[1], c, e);
   }
-  var h = 0, l = 0;
+  var h = 0, k = 0;
   if (1 < b) {
-    var r = Object.create(null);
-    const n = [];
-    for (let q = 0, k; q < b; q++) {
-      if ((k = a[q]) && !r[k]) {
-        if (f || M(this, k)) {
-          n.push(k), r[k] = 1;
+    var p = u();
+    const q = [];
+    for (let r = 0, l; r < b; r++) {
+      if ((l = a[r]) && !p[l]) {
+        if (f || N(this, l)) {
+          q.push(l), p[l] = 1;
         } else {
           return d;
         }
-        const m = k.length;
-        h = Math.max(h, m);
-        l = l ? Math.min(l, m) : m;
+        const n = l.length;
+        h = Math.max(h, n);
+        k = k ? Math.min(k, n) : n;
       }
     }
-    a = n;
+    a = q;
     b = a.length;
   }
   if (!b) {
     return d;
   }
-  r = 0;
+  p = 0;
   if (1 === b) {
-    return K.call(this, a[0], "", c, e);
+    return L.call(this, a[0], "", c, e);
   }
   if (2 === b && g && !f) {
-    return K.call(this, a[0], a[1], c, e);
+    return L.call(this, a[0], a[1], c, e);
   }
   if (1 < b) {
     if (g) {
-      var p = a[0];
-      r = 1;
+      var m = a[0];
+      p = 1;
     } else {
-      9 < h && 3 < h / l && a.sort(u);
+      9 < h && 3 < h / k && a.sort(v);
     }
   }
-  for (let n, q; r < b; r++) {
-    q = a[r];
-    p ? (n = M(this, q, p), n = N(n, d, f, this.C, c, e, 2 === b), f && !1 === n && d.length || (p = q)) : (n = M(this, q), n = N(n, d, f, this.resolution, c, e, 1 === b));
-    if (n) {
-      return n;
+  for (let q, r; p < b; p++) {
+    r = a[p];
+    m ? (q = N(this, r, m), q = O(q, d, f, this.C, c, e, 2 === b), f && !1 === q && d.length || (m = r)) : (q = N(this, r), q = O(q, d, f, this.resolution, c, e, 1 === b));
+    if (q) {
+      return q;
     }
-    if (f && r === b - 1) {
+    if (f && p === b - 1) {
       g = d.length;
       if (!g) {
-        if (p) {
-          p = "";
-          r = -1;
+        if (m) {
+          m = "";
+          p = -1;
           continue;
         }
         return d;
       }
       if (1 === g) {
-        return J(d[0], c, e);
+        return K(d[0], c, e);
       }
     }
   }
   a: {
     a = d;
     d = this.resolution;
-    p = f;
+    m = f;
     b = a.length;
     f = [];
-    g = Object.create(null);
-    for (let n = 0, q, k, m, z; n < d; n++) {
-      for (l = 0; l < b; l++) {
-        if (m = a[l], n < m.length && (q = m[n])) {
-          for (r = 0; r < q.length; r++) {
-            k = q[r], (h = g[k]) ? g[k]++ : (h = 0, g[k] = 1), z = f[h] || (f[h] = []), z.push(k);
+    g = u();
+    for (let q = 0, r, l, n, A; q < d; q++) {
+      for (k = 0; k < b; k++) {
+        if (n = a[k], q < n.length && (r = n[q])) {
+          for (p = 0; p < r.length; p++) {
+            l = r[p], (h = g[l]) ? g[l]++ : (h = 0, g[l] = 1), A = f[h] || (f[h] = []), A.push(l);
           }
         }
       }
     }
     if (a = f.length) {
-      if (p) {
+      if (m) {
         d = [];
-        for (let n = a - 1, q = 0, k, m; 0 <= n; n--) {
-          if (k = f[n], m = k.length, e >= m) {
-            e -= m;
+        for (let q = a - 1, r = 0, l, n; 0 <= q; q--) {
+          if (l = f[q], n = l.length, e >= n) {
+            e -= n;
           } else {
-            if (m + q > c || e) {
-              k = k.slice(e, c - q + e), m = k.length;
+            if (n + r > c || e) {
+              l = l.slice(e, c - r + e), n = l.length;
             }
-            d.push(k);
-            q += m;
-            if (c === q) {
+            d.push(l);
+            r += n;
+            if (c === r) {
               break;
             }
           }
         }
-        f = 1 < d.length ? [].concat.apply([], d) : d[0];
+        if (1 < d.length) {
+          f = d;
+          a = [];
+          d = u();
+          g = f.length;
+          for (k = 0; k < g; k++) {
+            for (m = f[k], h = m.length, p = 0; p < h; p++) {
+              if (b = m[p], !d[b]) {
+                if (d[b] = 1, e) {
+                  e--;
+                } else {
+                  if (a.push(b), a.length === c) {
+                    break;
+                  }
+                }
+              }
+            }
+          }
+          c = a;
+        } else {
+          c = d[0];
+        }
+        f = c;
       } else {
         if (a < b) {
           d = [];
@@ -422,23 +447,23 @@ function H(a, c, b, d, e) {
   }
   return d;
 };
-function K(a, c, b, d) {
-  return (a = M(this, a, c)) && a.length ? J(a, b, d) : [];
+function L(a, c, b, d) {
+  return (a = N(this, a, c)) && a.length ? K(a, b, d) : [];
 }
-function N(a, c, b, d, e, g, f) {
+function O(a, c, b, d, e, g, f) {
   let h = [];
   if (a) {
     d = Math.min(a.length, d);
-    for (let l = 0, r = 0, p; l < d; l++) {
-      if (p = a[l]) {
-        if (g && p && f && (p.length <= g ? (g -= p.length, p = null) : (p = p.slice(g), g = 0)), p && (h[l] = p, f && (r += p.length, r >= e))) {
+    for (let k = 0, p = 0, m; k < d; k++) {
+      if (m = a[k]) {
+        if (g && m && f && (m.length <= g ? (g -= m.length, m = null) : (m = m.slice(g), g = 0)), m && (h[k] = m, f && (p += m.length, p >= e))) {
           break;
         }
       }
     }
     if (h.length) {
       if (f) {
-        return J(h, e, 0);
+        return K(h, e, 0);
       }
       c.push(h);
       return;
@@ -446,13 +471,13 @@ function N(a, c, b, d, e, g, f) {
   }
   return !b && h;
 }
-function M(a, c, b) {
+function N(a, c, b) {
   let d;
   b && (d = a.bidirectional && c > b);
   a = b ? (a = a.l.get(d ? c : b)) && a.get(d ? b : c) : a.map.get(c);
   return a;
 }
-;G.prototype.remove = function(a, c) {
+;H.prototype.remove = function(a, c) {
   const b = this.g.size && (this.fastupdate ? this.g.get(a) : this.g.has(a));
   if (b) {
     if (this.fastupdate) {
@@ -467,14 +492,14 @@ function M(a, c, b) {
         }
       }
     } else {
-      O(this.map, a), this.depth && O(this.l, a);
+      P(this.map, a), this.depth && P(this.l, a);
     }
     c || this.g.delete(a);
   }
   this.cache && this.cache.remove(a);
   return this;
 };
-function O(a, c) {
+function P(a, c) {
   let b = 0;
   if (a.constructor === Array) {
     for (let d = 0, e, g; d < a.length; d++) {
@@ -489,25 +514,25 @@ function O(a, c) {
     }
   } else {
     for (let d of a) {
-      const e = d[0], g = O(d[1], c);
+      const e = d[0], g = P(d[1], c);
       g ? b += g : a.delete(e);
     }
   }
   return b;
 }
-;function G(a, c) {
+;function H(a, c) {
   if (!this) {
-    return new G(a);
+    return new H(a);
   }
   if (a) {
     var b = "string" === typeof a ? a : a.preset;
-    b && (F[b] || console.warn("Preset not found: " + b), a = Object.assign({}, F[b], a));
+    b && (G[b] || console.warn("Preset not found: " + b), a = Object.assign({}, G[b], a));
   } else {
     a = {};
   }
   b = a.context || {};
-  const d = a.encode || a.encoder || E;
-  this.encoder = d.encode ? d : "object" === typeof d ? new B(d) : {encode:d};
+  const d = a.encode || a.encoder || F;
+  this.encoder = d.encode ? d : "object" === typeof d ? new C(d) : {encode:d};
   let e;
   this.resolution = a.resolution || 9;
   this.tokenize = e = a.tokenize || "strict";
@@ -521,29 +546,29 @@ function O(a, c) {
   this.g = c || (this.fastupdate ? new Map() : new Set());
   this.C = b.resolution || 1;
   this.rtl = d.rtl || a.rtl || !1;
-  this.cache = (e = a.cache || null) && new D(e);
+  this.cache = (e = a.cache || null) && new E(e);
 }
-G.prototype.clear = function() {
+H.prototype.clear = function() {
   this.map.clear();
   this.l.clear();
   this.g.clear();
   this.cache && this.cache.clear();
   return this;
 };
-G.prototype.append = function(a, c) {
+H.prototype.append = function(a, c) {
   return this.add(a, c, !0);
 };
-G.prototype.contain = function(a) {
+H.prototype.contain = function(a) {
   return this.g.has(a);
 };
-G.prototype.update = function(a, c) {
+H.prototype.update = function(a, c) {
   if (this.async) {
     const b = this, d = this.remove(a);
     return d.then ? d.then(() => b.add(a, c)) : this.add(a, c);
   }
   return this.remove(a).add(a, c);
 };
-function P(a) {
+function Q(a) {
   let c = 0;
   if (a.constructor === Array) {
     for (let b = 0, d; b < a.length; b++) {
@@ -551,21 +576,21 @@ function P(a) {
     }
   } else {
     for (const b of a) {
-      const d = b[0], e = P(b[1]);
+      const d = b[0], e = Q(b[1]);
       e ? c += e : a.delete(d);
     }
   }
   return c;
 }
-G.prototype.cleanup = function() {
+H.prototype.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
-  P(this.map);
-  this.depth && P(this.l);
+  Q(this.map);
+  this.depth && Q(this.l);
   return this;
 };
-G.prototype.searchCache = function(a, c, b) {
+H.prototype.searchCache = function(a, c, b) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
   let d = this.cache.get(a);
   if (!d) {
@@ -581,9 +606,9 @@ G.prototype.searchCache = function(a, c, b) {
   }
   return d;
 };
-const Q = {Index:G, Charset:null, Encoder:B, Document:null, Worker:null, Resolver:null, IndexedDB:null, Language:{}}, R = self;
-let S;
-(S = R.define) && S.amd ? S([], function() {
-  return Q;
-}) : "object" === typeof R.exports ? R.exports = Q : R.FlexSearch = Q;
+const R = {Index:H, Charset:null, Encoder:C, Document:null, Worker:null, Resolver:null, IndexedDB:null, Language:{}}, S = self;
+let T;
+(T = S.define) && T.amd ? T([], function() {
+  return R;
+}) : "object" === typeof S.exports ? S.exports = R : S.FlexSearch = R;
 }(this));
diff --git a/dist/flexsearch.light.min.js b/dist/flexsearch.light.min.js
index 5737577..f11af35 100644
--- a/dist/flexsearch.light.min.js
+++ b/dist/flexsearch.light.min.js
@@ -5,21 +5,22 @@
  * Hosted by Nextapps GmbH
  * https://github.com/nextapps-de/flexsearch
  */
-(function(self){'use strict';function t(a,c,b){const d=typeof b,e=typeof a;if("undefined"!==d){if("undefined"!==e){if(b){if("function"===e&&d===e)return function(h){return a(b(h))};c=a.constructor;if(c===b.constructor){if(c===Array)return b.concat(a);if(c===Map){var g=new Map(b);for(var f of a)g.set(f[0],f[1]);return g}if(c===Set){f=new Set(b);for(g of a.values())f.add(g);return f}}}return a}return b}return"undefined"===e?c:a}function u(a,c){return c.length-a.length};const v=/[^\p{L}\p{N}]+/u,w=/(\d{3})/g,x=/(\D)(\d{3})/g,y=/(\d{3})(\D)/g,A="".normalize&&/[\u0300-\u036f]/g;function B(a){if(!this)return new B(...arguments);for(let c=0;c<arguments.length;c++)this.assign(arguments[c])}
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+C.prototype.assign=function(a){this.normalize=t(a.normalize,!0,this.normalize);let c=a.include,b=c||a.exclude||a.split;if("object"===typeof b){let d=!c,e="";a.include||(e+="\\p{Z}");b.letter&&(e+="\\p{L}");b.number&&(e+="\\p{N}",d=!!c);b.symbol&&(e+="\\p{S}");b.punctuation&&(e+="\\p{P}");b.control&&(e+="\\p{C}");if(b=b.char)e+="object"===typeof b?b.join(""):b;this.split=new RegExp("["+(c?"^":"")+e+"]+","u");this.numeric=d}else this.split=t(b,w,this.split),this.numeric=t(this.numeric,!0);this.prepare=
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+function N(a,c,b){let d;b&&(d=a.bidirectional&&c>b);a=b?(a=a.l.get(d?c:b))&&a.get(d?b:c):a.map.get(c);return a};H.prototype.remove=function(a,c){const b=this.g.size&&(this.fastupdate?this.g.get(a):this.g.has(a));if(b){if(this.fastupdate)for(let d=0,e;d<b.length;d++){if(e=b[d])if(2>e.length)e.pop();else{const g=e.indexOf(a);g===b.length-1?e.pop():e.splice(g,1)}}else P(this.map,a),this.depth&&P(this.l,a);c||this.g.delete(a)}this.cache&&this.cache.remove(a);return this};
+function P(a,c){let b=0;if(a.constructor===Array)for(let d=0,e,g;d<a.length;d++){if((e=a[d])&&e.length)if(g=e.indexOf(c),0<=g){1<e.length?(e.splice(g,1),b++):delete a[d];break}else b++}else for(let d of a){const e=d[0],g=P(d[1],c);g?b+=g:a.delete(e)}return b};function H(a,c){if(!this)return new H(a);if(a){var b="string"===typeof a?a:a.preset;b&&(a=Object.assign({},G[b],a))}else a={};b=a.context||{};const d=a.encode||a.encoder||F;this.encoder=d.encode?d:"object"===typeof d?new C(d):{encode:d};let e;this.resolution=a.resolution||9;this.tokenize=e=a.tokenize||"strict";this.depth="strict"===e&&b.depth||0;this.bidirectional=!1!==b.bidirectional;this.fastupdate=!!a.fastupdate;this.score=a.score||null;e=!1;this.map=new Map;this.l=new Map;this.g=c||(this.fastupdate?
+new Map:new Set);this.C=b.resolution||1;this.rtl=d.rtl||a.rtl||!1;this.cache=(e=a.cache||null)&&new E(e)}H.prototype.clear=function(){this.map.clear();this.l.clear();this.g.clear();this.cache&&this.cache.clear();return this};H.prototype.append=function(a,c){return this.add(a,c,!0)};H.prototype.contain=function(a){return this.g.has(a)};H.prototype.update=function(a,c){if(this.async){const b=this,d=this.remove(a);return d.then?d.then(()=>b.add(a,c)):this.add(a,c)}return this.remove(a).add(a,c)};
+function Q(a){let c=0;if(a.constructor===Array)for(let b=0,d;b<a.length;b++)(d=a[b])&&(c+=d.length);else for(const b of a){const d=b[0],e=Q(b[1]);e?c+=e:a.delete(d)}return c}H.prototype.cleanup=function(){if(!this.fastupdate)return this;Q(this.map);this.depth&&Q(this.l);return this};
+H.prototype.searchCache=function(a,c,b){a=("object"===typeof a?""+a.query:a).toLowerCase();let d=this.cache.get(a);if(!d){d=this.search(a,c,b);if(d.then){const e=this;d.then(function(g){e.cache.set(a,g);return g})}this.cache.set(a,d)}return d};const R={Index:H,Charset:null,Encoder:C,Document:null,Worker:null,Resolver:null,IndexedDB:null,Language:{}},S=self;let T;(T=S.define)&&T.amd?T([],function(){return R}):"object"===typeof S.exports?S.exports=R:S.FlexSearch=R;}(this));
diff --git a/dist/flexsearch.light.module.debug.js b/dist/flexsearch.light.module.debug.js
index 1ad9cdf..4f9f0ea 100644
--- a/dist/flexsearch.light.module.debug.js
+++ b/dist/flexsearch.light.module.debug.js
@@ -5,84 +5,87 @@
  * Hosted by Nextapps GmbH
  * https://github.com/nextapps-de/flexsearch
  */
-function t(a, b) {
+function t() {
+  return Object.create(null);
+}
+function u(a, b) {
   return b.length - a.length;
 }
-;function u(a) {
+;function v(a) {
   this.limit = a && !0 !== a ? a : 1000;
   this.cache = new Map();
   this.B = "";
 }
-u.prototype.set = function(a, b) {
+v.prototype.set = function(a, b) {
   this.cache.set(this.B = a, b);
   this.cache.size > this.limit && this.cache.delete(this.cache.keys().next().value);
 };
-u.prototype.get = function(a) {
+v.prototype.get = function(a) {
   const b = this.cache.get(a);
   b && this.B !== a && (this.cache.delete(a), this.cache.set(this.B = a, b));
   return b;
 };
-u.prototype.remove = function(a) {
+v.prototype.remove = function(a) {
   for (const b of this.cache) {
     const c = b[0];
     b[1].includes(a) && this.cache.delete(c);
   }
 };
-u.prototype.clear = function() {
+v.prototype.clear = function() {
   this.cache.clear();
   this.B = "";
 };
-const v = 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 w = new Map([["ai", "ei"], ["ae", "a"], ["oe", "o"], ["ue", "u"], ["sh", "s"], ["ch", "c"], ["th", "t"], ["ph", "f"], ["pf", "f"]]), y = [/([^aeo])h([aeo$])/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2"];
-const z = {a:"", e:"", i:"", o:"", u:"", y:"", b:1, f:1, p:1, v:1, c:2, g:2, j:2, k:2, q:2, s:2, x:2, z:2, "\u00df":2, d:3, t:3, l:4, m:5, n:5, r:6};
-const A = /[\x00-\x7F]+/g;
+const w = new Map([["b", "p"], ["v", "f"], ["w", "f"], ["z", "s"], ["x", "s"], ["d", "t"], ["n", "m"], ["c", "k"], ["g", "k"], ["j", "k"], ["q", "k"], ["i", "e"], ["y", "e"], ["u", "o"]]);
+const x = new Map([["ai", "ei"], ["ae", "a"], ["oe", "o"], ["ue", "u"], ["sh", "s"], ["ch", "c"], ["th", "t"], ["ph", "f"], ["pf", "f"]]), z = [/([^aeo])h([aeo$])/g, "$1$2", /([aeo])h([^aeo]|$)/g, "$1$2"];
+const A = {a:"", e:"", i:"", o:"", u:"", y:"", b:1, f:1, p:1, v:1, c:2, g:2, j:2, k:2, q:2, s:2, x:2, z:2, "\u00df":2, d:3, t:3, l:4, m:5, n:5, r:6};
 const B = /[\x00-\x7F]+/g;
 const C = /[\x00-\x7F]+/g;
-var D = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:{normalize:function(a) {
+const D = /[\x00-\x7F]+/g;
+var E = {LatinExact:{normalize:!1, dedupe:!1}, LatinDefault:{normalize:function(a) {
   return a.toLowerCase();
-}, dedupe:!1}, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:v}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:v, replacer:y, matcher:w}, LatinExtra:{normalize:!0, dedupe:!0, mapper:v, replacer:y.concat([/(?!^)[aeoy]/g, ""]), matcher:w}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
+}, dedupe:!1}, LatinSimple:{normalize:!0, dedupe:!0}, LatinBalance:{normalize:!0, dedupe:!0, mapper:w}, LatinAdvanced:{normalize:!0, dedupe:!0, mapper:w, replacer:z, matcher:x}, LatinExtra:{normalize:!0, dedupe:!0, mapper:w, replacer:z.concat([/(?!^)[aeoy]/g, ""]), matcher:x}, LatinSoundex:{normalize:!0, dedupe:!1, include:{letter:!0}, finalize:function(a) {
   for (let c = 0; c < a.length; c++) {
     var b = a[c];
-    let d = b.charAt(0), e = z[d];
-    for (let f = 1, g; f < b.length && (g = b.charAt(f), "h" === g || "w" === g || !(g = z[g]) || g === e || (d += g, e = g, 4 !== d.length)); f++) {
+    let d = b.charAt(0), e = A[d];
+    for (let f = 1, g; f < b.length && (g = b.charAt(f), "h" === g || "w" === g || !(g = A[g]) || g === e || (d += g, e = g, 4 !== d.length)); f++) {
     }
     a[c] = d;
   }
 }}, ArabicDefault:{rtl:!0, normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(A, " ");
+  return ("" + a).replace(B, " ");
 }}, CjkDefault:{normalize:!1, dedupe:!0, split:"", prepare:function(a) {
-  return ("" + a).replace(B, "");
+  return ("" + a).replace(C, "");
 }}, CyrillicDefault:{normalize:!1, dedupe:!0, prepare:function(a) {
-  return ("" + a).replace(C, " ");
+  return ("" + a).replace(D, " ");
 }}};
-const E = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
-function F(a) {
+const F = {memory:{resolution:1}, performance:{resolution:6, fastupdate:!0, context:{depth:1, resolution:3}}, match:{tokenize:"forward"}, score:{resolution:9, context:{depth:2, resolution:9}}};
+function G(a) {
   const b = "string" === typeof a ? a : a.preset;
-  b && (E[b] || console.warn("Preset not found: " + b), a = Object.assign({}, E[b], a));
+  b && (F[b] || console.warn("Preset not found: " + b), a = Object.assign({}, F[b], a));
   return a;
 }
-;Object.create(null);
-G.prototype.add = function(a, b, c, d) {
+;t();
+H.prototype.add = function(a, b, c, d) {
   if (b && (a || 0 === a)) {
     if (!d && !c && this.h.has(a)) {
       return this.update(a, b);
     }
     b = this.encoder.encode(b);
     if (d = b.length) {
-      const r = Object.create(null), p = Object.create(null), n = this.depth, q = this.resolution;
+      const q = t(), n = t(), p = this.depth, r = this.resolution;
       for (let k = 0; k < d; k++) {
-        let l = b[this.rtl ? d - 1 - k : k];
-        var e = l.length;
-        if (e && (n || !p[l])) {
-          var f = this.score ? this.score(b, l, k, null, 0) : H(q, d, k), g = "";
+        let m = b[this.rtl ? d - 1 - k : k];
+        var e = m.length;
+        if (e && (p || !n[m])) {
+          var f = this.score ? this.score(b, m, k, null, 0) : I(r, d, k), g = "";
           switch(this.tokenize) {
             case "full":
               if (2 < e) {
                 for (f = 0; f < e; f++) {
                   for (var h = e; h > f; h--) {
-                    g = l.substring(f, h);
-                    var m = this.score ? this.score(b, l, k, g, f) : H(q, d, k, e, f);
-                    J(this, p, g, m, a, c);
+                    g = m.substring(f, h);
+                    var l = this.score ? this.score(b, m, k, g, f) : I(r, d, k, e, f);
+                    K(this, n, g, l, a, c);
                   }
                 }
                 break;
@@ -90,24 +93,24 @@ G.prototype.add = function(a, b, c, d) {
             case "reverse":
               if (1 < e) {
                 for (h = e - 1; 0 < h; h--) {
-                  g = l[h] + g, m = this.score ? this.score(b, l, k, g, h) : H(q, d, k, e, h), J(this, p, g, m, a, c);
+                  g = m[h] + g, l = this.score ? this.score(b, m, k, g, h) : I(r, d, k, e, h), K(this, n, g, l, a, c);
                 }
                 g = "";
               }
             case "forward":
               if (1 < e) {
                 for (h = 0; h < e; h++) {
-                  g += l[h], J(this, p, g, f, a, c);
+                  g += m[h], K(this, n, g, f, a, c);
                 }
                 break;
               }
             default:
-              if (J(this, p, l, f, a, c), n && 1 < d && k < d - 1) {
-                for (e = Object.create(null), g = this.C, f = l, h = Math.min(n + 1, d - k), e[f] = 1, m = 1; m < h; m++) {
-                  if ((l = b[this.rtl ? d - 1 - k - m : k + m]) && !e[l]) {
-                    e[l] = 1;
-                    const x = this.score ? this.score(b, f, k, l, m) : H(g + (d / 2 > g ? 0 : 1), d, k, h - 1, m - 1), I = this.bidirectional && l > f;
-                    J(this, r, I ? f : l, x, a, c, I ? l : f);
+              if (K(this, n, m, f, a, c), p && 1 < d && k < d - 1) {
+                for (e = t(), g = this.C, f = m, h = Math.min(p + 1, d - k), e[f] = 1, l = 1; l < h; l++) {
+                  if ((m = b[this.rtl ? d - 1 - k - l : k + l]) && !e[m]) {
+                    e[m] = 1;
+                    const y = this.score ? this.score(b, f, k, m, l) : I(g + (d / 2 > g ? 0 : 1), d, k, h - 1, l - 1), J = this.bidirectional && m > f;
+                    K(this, q, J ? f : m, y, a, c, J ? m : f);
                   }
                 }
               }
@@ -119,14 +122,14 @@ G.prototype.add = function(a, b, c, d) {
   }
   return this;
 };
-function J(a, b, c, d, e, f, g) {
-  let h = g ? a.A : a.map, m;
-  b[c] && g && (m = b[c])[g] || (g ? (b = m || (b[c] = Object.create(null)), b[g] = 1, (m = h.get(g)) ? h = m : h.set(g, h = new Map())) : b[c] = 1, (m = h.get(c)) ? h = m : h.set(c, h = []), h = h[d] || (h[d] = []), f && h.includes(e) || (h.push(e), a.fastupdate && ((b = a.h.get(e)) ? b.push(h) : a.h.set(e, [h]))));
+function K(a, b, c, d, e, f, g) {
+  let h = g ? a.A : a.map, l;
+  b[c] && g && (l = b[c])[g] || (g ? (b = l || (b[c] = t()), b[g] = 1, (l = h.get(g)) ? h = l : h.set(g, h = new Map())) : b[c] = 1, (l = h.get(c)) ? h = l : h.set(c, h = []), h = h[d] || (h[d] = []), f && h.includes(e) || (h.push(e), a.fastupdate && ((b = a.h.get(e)) ? b.push(h) : a.h.set(e, [h]))));
 }
-function H(a, b, c, d, e) {
+function I(a, b, c, d, e) {
   return c && 1 < a ? b + (d || 0) <= a ? c + (e || 0) : (a - 1) / (b + (d || 0)) * (c + (e || 0)) + 1 | 0 : 0;
 }
-;function K(a, b, c) {
+;function L(a, b, c) {
   if (1 === a.length) {
     return a = a[0], a = c || a.length > b ? b ? a.slice(c, c + b) : a.slice(c) : a;
   }
@@ -156,7 +159,7 @@ function H(a, b, c, d, e) {
   }
   return d.length ? d = 1 < d.length ? [].concat.apply([], d) : d[0] : d;
 }
-;G.prototype.search = function(a, b, c) {
+;H.prototype.search = function(a, b, c) {
   c || (b || "object" !== typeof a ? "object" === typeof b && (c = b, b = 0) : (c = a, a = ""));
   var d = [], e = 0;
   if (c) {
@@ -170,104 +173,126 @@ function H(a, b, c, d, e) {
   c = a.length;
   b || (b = 100);
   if (1 === c) {
-    return L.call(this, a[0], "", b, e);
+    return M.call(this, a[0], "", b, e);
   }
   f = this.depth && !1 !== f;
   if (2 === c && f && !g) {
-    return L.call(this, a[0], a[1], b, e);
+    return M.call(this, a[0], a[1], b, e);
   }
-  var h = 0, m = 0;
+  var h = 0, l = 0;
   if (1 < c) {
-    var r = Object.create(null);
-    const n = [];
-    for (let q = 0, k; q < c; q++) {
-      if ((k = a[q]) && !r[k]) {
-        if (g || M(this, k)) {
-          n.push(k), r[k] = 1;
+    var q = t();
+    const p = [];
+    for (let r = 0, k; r < c; r++) {
+      if ((k = a[r]) && !q[k]) {
+        if (g || N(this, k)) {
+          p.push(k), q[k] = 1;
         } else {
           return d;
         }
-        const l = k.length;
-        h = Math.max(h, l);
-        m = m ? Math.min(m, l) : l;
+        const m = k.length;
+        h = Math.max(h, m);
+        l = l ? Math.min(l, m) : m;
       }
     }
-    a = n;
+    a = p;
     c = a.length;
   }
   if (!c) {
     return d;
   }
-  r = 0;
+  q = 0;
   if (1 === c) {
-    return L.call(this, a[0], "", b, e);
+    return M.call(this, a[0], "", b, e);
   }
   if (2 === c && f && !g) {
-    return L.call(this, a[0], a[1], b, e);
+    return M.call(this, a[0], a[1], b, e);
   }
   if (1 < c) {
     if (f) {
-      var p = a[0];
-      r = 1;
+      var n = a[0];
+      q = 1;
     } else {
-      9 < h && 3 < h / m && a.sort(t);
+      9 < h && 3 < h / l && a.sort(u);
     }
   }
-  for (let n, q; r < c; r++) {
-    q = a[r];
-    p ? (n = M(this, q, p), n = N(n, d, g, this.C, b, e, 2 === c), g && !1 === n && d.length || (p = q)) : (n = M(this, q), n = N(n, d, g, this.resolution, b, e, 1 === c));
-    if (n) {
-      return n;
+  for (let p, r; q < c; q++) {
+    r = a[q];
+    n ? (p = N(this, r, n), p = O(p, d, g, this.C, b, e, 2 === c), g && !1 === p && d.length || (n = r)) : (p = N(this, r), p = O(p, d, g, this.resolution, b, e, 1 === c));
+    if (p) {
+      return p;
     }
-    if (g && r === c - 1) {
+    if (g && q === c - 1) {
       f = d.length;
       if (!f) {
-        if (p) {
-          p = "";
-          r = -1;
+        if (n) {
+          n = "";
+          q = -1;
           continue;
         }
         return d;
       }
       if (1 === f) {
-        return K(d[0], b, e);
+        return L(d[0], b, e);
       }
     }
   }
   a: {
     a = d;
     d = this.resolution;
-    p = g;
+    n = g;
     c = a.length;
     g = [];
-    f = Object.create(null);
-    for (let n = 0, q, k, l, x; n < d; n++) {
-      for (m = 0; m < c; m++) {
-        if (l = a[m], n < l.length && (q = l[n])) {
-          for (r = 0; r < q.length; r++) {
-            k = q[r], (h = f[k]) ? f[k]++ : (h = 0, f[k] = 1), x = g[h] || (g[h] = []), x.push(k);
+    f = t();
+    for (let p = 0, r, k, m, y; p < d; p++) {
+      for (l = 0; l < c; l++) {
+        if (m = a[l], p < m.length && (r = m[p])) {
+          for (q = 0; q < r.length; q++) {
+            k = r[q], (h = f[k]) ? f[k]++ : (h = 0, f[k] = 1), y = g[h] || (g[h] = []), y.push(k);
           }
         }
       }
     }
     if (a = g.length) {
-      if (p) {
+      if (n) {
         d = [];
-        for (let n = a - 1, q = 0, k, l; 0 <= n; n--) {
-          if (k = g[n], l = k.length, e >= l) {
-            e -= l;
+        for (let p = a - 1, r = 0, k, m; 0 <= p; p--) {
+          if (k = g[p], m = k.length, e >= m) {
+            e -= m;
           } else {
-            if (l + q > b || e) {
-              k = k.slice(e, b - q + e), l = k.length;
+            if (m + r > b || e) {
+              k = k.slice(e, b - r + e), m = k.length;
             }
             d.push(k);
-            q += l;
-            if (b === q) {
+            r += m;
+            if (b === r) {
               break;
             }
           }
         }
-        g = 1 < d.length ? [].concat.apply([], d) : d[0];
+        if (1 < d.length) {
+          g = d;
+          a = [];
+          d = t();
+          f = g.length;
+          for (l = 0; l < f; l++) {
+            for (n = g[l], h = n.length, q = 0; q < h; q++) {
+              if (c = n[q], !d[c]) {
+                if (d[c] = 1, e) {
+                  e--;
+                } else {
+                  if (a.push(c), a.length === b) {
+                    break;
+                  }
+                }
+              }
+            }
+          }
+          b = a;
+        } else {
+          b = d[0];
+        }
+        g = b;
       } else {
         if (a < c) {
           d = [];
@@ -283,23 +308,23 @@ function H(a, b, c, d, e) {
   }
   return d;
 };
-function L(a, b, c, d) {
-  return (a = M(this, a, b)) && a.length ? K(a, c, d) : [];
+function M(a, b, c, d) {
+  return (a = N(this, a, b)) && a.length ? L(a, c, d) : [];
 }
-function N(a, b, c, d, e, f, g) {
+function O(a, b, c, d, e, f, g) {
   let h = [];
   if (a) {
     d = Math.min(a.length, d);
-    for (let m = 0, r = 0, p; m < d; m++) {
-      if (p = a[m]) {
-        if (f && p && g && (p.length <= f ? (f -= p.length, p = null) : (p = p.slice(f), f = 0)), p && (h[m] = p, g && (r += p.length, r >= e))) {
+    for (let l = 0, q = 0, n; l < d; l++) {
+      if (n = a[l]) {
+        if (f && n && g && (n.length <= f ? (f -= n.length, n = null) : (n = n.slice(f), f = 0)), n && (h[l] = n, g && (q += n.length, q >= e))) {
           break;
         }
       }
     }
     if (h.length) {
       if (g) {
-        return K(h, e, 0);
+        return L(h, e, 0);
       }
       b.push(h);
       return;
@@ -307,13 +332,13 @@ function N(a, b, c, d, e, f, g) {
   }
   return !c && h;
 }
-function M(a, b, c) {
+function N(a, b, c) {
   let d;
   c && (d = a.bidirectional && b > c);
   a = c ? (a = a.A.get(d ? b : c)) && a.get(d ? c : b) : a.map.get(b);
   return a;
 }
-;G.prototype.remove = function(a, b) {
+;H.prototype.remove = function(a, b) {
   const c = this.h.size && (this.fastupdate ? this.h.get(a) : this.h.has(a));
   if (c) {
     if (this.fastupdate) {
@@ -328,14 +353,14 @@ function M(a, b, c) {
         }
       }
     } else {
-      O(this.map, a), this.depth && O(this.A, a);
+      P(this.map, a), this.depth && P(this.A, a);
     }
     b || this.h.delete(a);
   }
   this.cache && this.cache.remove(a);
   return this;
 };
-function O(a, b) {
+function P(a, b) {
   let c = 0;
   if (a.constructor === Array) {
     for (let d = 0, e, f; d < a.length; d++) {
@@ -350,17 +375,17 @@ function O(a, b) {
     }
   } else {
     for (let d of a) {
-      const e = d[0], f = O(d[1], b);
+      const e = d[0], f = P(d[1], b);
       f ? c += f : a.delete(e);
     }
   }
   return c;
 }
-;function G(a, b) {
+;function H(a, b) {
   if (!this) {
-    return new G(a);
+    return new H(a);
   }
-  a = a ? F(a) : {};
+  a = a ? G(a) : {};
   const c = a.context || {}, d = a.encode || a.encoder || function(f) {
     return f.toLowerCase().trim().split(/\s+/);
   };
@@ -378,29 +403,29 @@ function O(a, b) {
   this.h = b || (this.fastupdate ? new Map() : new Set());
   this.C = c.resolution || 1;
   this.rtl = d.rtl || a.rtl || !1;
-  this.cache = (e = a.cache || null) && new u(e);
+  this.cache = (e = a.cache || null) && new v(e);
 }
-G.prototype.clear = function() {
+H.prototype.clear = function() {
   this.map.clear();
   this.A.clear();
   this.h.clear();
   this.cache && this.cache.clear();
   return this;
 };
-G.prototype.append = function(a, b) {
+H.prototype.append = function(a, b) {
   return this.add(a, b, !0);
 };
-G.prototype.contain = function(a) {
+H.prototype.contain = function(a) {
   return this.h.has(a);
 };
-G.prototype.update = function(a, b) {
+H.prototype.update = function(a, b) {
   if (this.async) {
     const c = this, d = this.remove(a);
     return d.then ? d.then(() => c.add(a, b)) : this.add(a, b);
   }
   return this.remove(a).add(a, b);
 };
-function P(a) {
+function Q(a) {
   let b = 0;
   if (a.constructor === Array) {
     for (let c = 0, d; c < a.length; c++) {
@@ -408,21 +433,21 @@ function P(a) {
     }
   } else {
     for (const c of a) {
-      const d = c[0], e = P(c[1]);
+      const d = c[0], e = Q(c[1]);
       e ? b += e : a.delete(d);
     }
   }
   return b;
 }
-G.prototype.cleanup = function() {
+H.prototype.cleanup = function() {
   if (!this.fastupdate) {
     return console.info('Cleanup the index isn\'t required when not using "fastupdate".'), this;
   }
-  P(this.map);
-  this.depth && P(this.A);
+  Q(this.map);
+  this.depth && Q(this.A);
   return this;
 };
-G.prototype.searchCache = function(a, b, c) {
+H.prototype.searchCache = function(a, b, c) {
   a = ("object" === typeof a ? "" + a.query : a).toLowerCase();
   let d = this.cache.get(a);
   if (!d) {
@@ -438,6 +463,6 @@ G.prototype.searchCache = function(a, b, c) {
   }
   return d;
 };
-export default {Index:G, Charset:D, Encoder:null, Document:null, Worker:null, Resolver:null, IndexedDB:null, Language:{}};
+export default {Index:H, Charset:E, Encoder:null, Document:null, Worker:null, Resolver:null, IndexedDB:null, Language:{}};
 
-export const Index=G;export const  Charset=D;export const  Encoder=null;export const  Document=null;export const  Worker=null;export const  Resolver=null;export const  IndexedDB=null;export const  Language={};
\ No newline at end of file
+export const Index=H;export const  Charset=E;export const  Encoder=null;export const  Document=null;export const  Worker=null;export const  Resolver=null;export const  IndexedDB=null;export const  Language={};
\ No newline at end of file
diff --git a/dist/flexsearch.light.module.min.js b/dist/flexsearch.light.module.min.js
index d616298..6ba238c 100644
--- a/dist/flexsearch.light.module.min.js
+++ b/dist/flexsearch.light.module.min.js
@@ -5,16 +5,17 @@
  * Hosted by Nextapps GmbH
  * https://github.com/nextapps-de/flexsearch
  */
-function t(a,b){return b.length-a.length};function u(a){this.limit=a&&!0!==a?a:1E3;this.cache=new Map;this.B=""}u.prototype.set=function(a,b){this.cache.set(this.B=a,b);this.cache.size>this.limit&&this.cache.delete(this.cache.keys().next().value)};u.prototype.get=function(a){const b=this.cache.get(a);b&&this.B!==a&&(this.cache.delete(a),this.cache.set(this.B=a,b));return b};u.prototype.remove=function(a){for(const b of this.cache){const c=b[0];b[1].includes(a)&&this.cache.delete(c)}};
-u.prototype.clear=function(){this.cache.clear();this.B=""};const v=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 w=new Map([["ai","ei"],["ae","a"],["oe","o"],["ue","u"],["sh","s"],["ch","c"],["th","t"],["ph","f"],["pf","f"]]),y=[/([^aeo])h([aeo$])/g,"$1$2",/([aeo])h([^aeo]|$)/g,"$1$2"];const z={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 A=/[\x00-\x7F]+/g;const B=/[\x00-\x7F]+/g;const C=/[\x00-\x7F]+/g;var D={LatinExact:{normalize:!1,dedupe:!1},LatinDefault:{normalize:function(a){return a.toLowerCase()},dedupe:!1},LatinSimple:{normalize:!0,dedupe:!0},LatinBalance:{normalize:!0,dedupe:!0,mapper:v},LatinAdvanced:{normalize:!0,dedupe:!0,mapper:v,replacer:y,matcher:w},LatinExtra:{normalize:!0,dedupe:!0,mapper:v,replacer:y.concat([/(?!^)[aeoy]/g,""]),matcher:w},LatinSoundex:{normalize:!0,dedupe:!1,include:{letter:!0},finalize:function(a){for(let c=0;c<a.length;c++){var b=a[c];let d=b.charAt(0),e=z[d];
-for(let f=1,g;f<b.length&&(g=b.charAt(f),"h"===g||"w"===g||!(g=z[g])||g===e||(d+=g,e=g,4!==d.length));f++);a[c]=d}}},ArabicDefault:{rtl:!0,normalize:!1,dedupe:!0,prepare:function(a){return(""+a).replace(A," ")}},CjkDefault:{normalize:!1,dedupe:!0,split:"",prepare:function(a){return(""+a).replace(B,"")}},CyrillicDefault:{normalize:!1,dedupe:!0,prepare:function(a){return(""+a).replace(C," ")}}};const E={memory:{resolution:1},performance:{resolution:6,fastupdate:!0,context:{depth:1,resolution:3}},match:{tokenize:"forward"},score:{resolution:9,context:{depth:2,resolution:9}}};function F(a){const b="string"===typeof a?a:a.preset;b&&(a=Object.assign({},E[b],a));return a};Object.create(null);G.prototype.add=function(a,b,c,d){if(b&&(a||0===a)){if(!d&&!c&&this.h.has(a))return this.update(a,b);b=this.encoder.encode(b);if(d=b.length){const r=Object.create(null),p=Object.create(null),n=this.depth,q=this.resolution;for(let k=0;k<d;k++){let l=b[this.rtl?d-1-k:k];var e=l.length;if(e&&(n||!p[l])){var f=this.score?this.score(b,l,k,null,0):I(q,d,k),g="";switch(this.tokenize){case "full":if(2<e){for(f=0;f<e;f++)for(var h=e;h>f;h--){g=l.substring(f,h);var m=this.score?this.score(b,l,k,g,f):I(q,d,
-k,e,f);J(this,p,g,m,a,c)}break}case "reverse":if(1<e){for(h=e-1;0<h;h--)g=l[h]+g,m=this.score?this.score(b,l,k,g,h):I(q,d,k,e,h),J(this,p,g,m,a,c);g=""}case "forward":if(1<e){for(h=0;h<e;h++)g+=l[h],J(this,p,g,f,a,c);break}default:if(J(this,p,l,f,a,c),n&&1<d&&k<d-1)for(e=Object.create(null),g=this.C,f=l,h=Math.min(n+1,d-k),e[f]=1,m=1;m<h;m++)if((l=b[this.rtl?d-1-k-m:k+m])&&!e[l]){e[l]=1;const x=this.score?this.score(b,f,k,l,m):I(g+(d/2>g?0:1),d,k,h-1,m-1),H=this.bidirectional&&l>f;J(this,r,H?f:l,
-x,a,c,H?l:f)}}}}this.fastupdate||this.h.add(a)}}return this};function J(a,b,c,d,e,f,g){let h=g?a.A:a.map,m;b[c]&&g&&(m=b[c])[g]||(g?(b=m||(b[c]=Object.create(null)),b[g]=1,(m=h.get(g))?h=m:h.set(g,h=new Map)):b[c]=1,(m=h.get(c))?h=m:h.set(c,h=[]),h=h[d]||(h[d]=[]),f&&h.includes(e)||(h.push(e),a.fastupdate&&((b=a.h.get(e))?b.push(h):a.h.set(e,[h]))))}function I(a,b,c,d,e){return c&&1<a?b+(d||0)<=a?c+(e||0):(a-1)/(b+(d||0))*(c+(e||0))+1|0:0};function K(a,b,c){if(1===a.length)return a=a[0],a=c||a.length>b?b?a.slice(c,c+b):a.slice(c):a;let d=[];for(let e=0,f,g;e<a.length;e++)if((f=a[e])&&(g=f.length)){if(c){if(c>=g){c-=g;continue}c<g&&(f=b?f.slice(c,c+b):f.slice(c),g=f.length,c=0)}if(d.length)g>b&&(f=f.slice(0,b),g=f.length),d.push(f);else{if(g>=b)return g>b&&(f=f.slice(0,b)),f;d=[f]}b-=g;if(!b)break}return d.length?d=1<d.length?[].concat.apply([],d):d[0]:d};G.prototype.search=function(a,b,c){c||(b||"object"!==typeof a?"object"===typeof b&&(c=b,b=0):(c=a,a=""));var d=[],e=0;if(c){a=c.query||a;b=c.limit||b;e=c.offset||0;var f=c.context;var g=!1}a=this.encoder.encode(a);c=a.length;b||(b=100);if(1===c)return L.call(this,a[0],"",b,e);f=this.depth&&!1!==f;if(2===c&&f&&!g)return L.call(this,a[0],a[1],b,e);var h=0,m=0;if(1<c){var r=Object.create(null);const n=[];for(let q=0,k;q<c;q++)if((k=a[q])&&!r[k]){if(g||M(this,k))n.push(k),r[k]=1;else return d;const l=
-k.length;h=Math.max(h,l);m=m?Math.min(m,l):l}a=n;c=a.length}if(!c)return d;r=0;if(1===c)return L.call(this,a[0],"",b,e);if(2===c&&f&&!g)return L.call(this,a[0],a[1],b,e);if(1<c)if(f){var p=a[0];r=1}else 9<h&&3<h/m&&a.sort(t);for(let n,q;r<c;r++){q=a[r];p?(n=M(this,q,p),n=N(n,d,g,this.C,b,e,2===c),g&&!1===n&&d.length||(p=q)):(n=M(this,q),n=N(n,d,g,this.resolution,b,e,1===c));if(n)return n;if(g&&r===c-1){f=d.length;if(!f){if(p){p="";r=-1;continue}return d}if(1===f)return K(d[0],b,e)}}a:{a=d;d=this.resolution;
-p=g;c=a.length;g=[];f=Object.create(null);for(let n=0,q,k,l,x;n<d;n++)for(m=0;m<c;m++)if(l=a[m],n<l.length&&(q=l[n]))for(r=0;r<q.length;r++)k=q[r],(h=f[k])?f[k]++:(h=0,f[k]=1),x=g[h]||(g[h]=[]),x.push(k);if(a=g.length)if(p){d=[];for(let n=a-1,q=0,k,l;0<=n;n--)if(k=g[n],l=k.length,e>=l)e-=l;else{if(l+q>b||e)k=k.slice(e,b-q+e),l=k.length;d.push(k);q+=l;if(b===q)break}g=1<d.length?[].concat.apply([],d):d[0]}else{if(a<c){d=[];break a}g=g[a-1];if(g.length>b||e)g=g.slice(e,b+e)}d=g}return d};
-function L(a,b,c,d){return(a=M(this,a,b))&&a.length?K(a,c,d):[]}function N(a,b,c,d,e,f,g){let h=[];if(a){d=Math.min(a.length,d);for(let m=0,r=0,p;m<d;m++)if(p=a[m])if(f&&p&&g&&(p.length<=f?(f-=p.length,p=null):(p=p.slice(f),f=0)),p&&(h[m]=p,g&&(r+=p.length,r>=e)))break;if(h.length){if(g)return K(h,e,0);b.push(h);return}}return!c&&h}function M(a,b,c){let d;c&&(d=a.bidirectional&&b>c);a=c?(a=a.A.get(d?b:c))&&a.get(d?c:b):a.map.get(b);return a};G.prototype.remove=function(a,b){const c=this.h.size&&(this.fastupdate?this.h.get(a):this.h.has(a));if(c){if(this.fastupdate)for(let d=0,e;d<c.length;d++){if(e=c[d])if(2>e.length)e.pop();else{const f=e.indexOf(a);f===c.length-1?e.pop():e.splice(f,1)}}else O(this.map,a),this.depth&&O(this.A,a);b||this.h.delete(a)}this.cache&&this.cache.remove(a);return this};
-function O(a,b){let c=0;if(a.constructor===Array)for(let d=0,e,f;d<a.length;d++){if((e=a[d])&&e.length)if(f=e.indexOf(b),0<=f){1<e.length?(e.splice(f,1),c++):delete a[d];break}else c++}else for(let d of a){const e=d[0],f=O(d[1],b);f?c+=f:a.delete(e)}return c};function G(a,b){if(!this)return new G(a);a=a?F(a):{};const c=a.context||{},d=a.encode||a.encoder||function(f){return f.toLowerCase().trim().split(/\s+/)};this.encoder=d.encode?d:"object"===typeof d?d:{encode:d};let e;this.resolution=a.resolution||9;this.tokenize=e=a.tokenize||"strict";this.depth="strict"===e&&c.depth||0;this.bidirectional=!1!==c.bidirectional;this.fastupdate=!!a.fastupdate;this.score=a.score||null;e=!1;this.map=new Map;this.A=new Map;this.h=b||(this.fastupdate?new Map:new Set);this.C=
-c.resolution||1;this.rtl=d.rtl||a.rtl||!1;this.cache=(e=a.cache||null)&&new u(e)}G.prototype.clear=function(){this.map.clear();this.A.clear();this.h.clear();this.cache&&this.cache.clear();return this};G.prototype.append=function(a,b){return this.add(a,b,!0)};G.prototype.contain=function(a){return this.h.has(a)};G.prototype.update=function(a,b){if(this.async){const c=this,d=this.remove(a);return d.then?d.then(()=>c.add(a,b)):this.add(a,b)}return this.remove(a).add(a,b)};
-function P(a){let b=0;if(a.constructor===Array)for(let c=0,d;c<a.length;c++)(d=a[c])&&(b+=d.length);else for(const c of a){const d=c[0],e=P(c[1]);e?b+=e:a.delete(d)}return b}G.prototype.cleanup=function(){if(!this.fastupdate)return this;P(this.map);this.depth&&P(this.A);return this};
-G.prototype.searchCache=function(a,b,c){a=("object"===typeof a?""+a.query:a).toLowerCase();let d=this.cache.get(a);if(!d){d=this.search(a,b,c);if(d.then){const e=this;d.then(function(f){e.cache.set(a,f);return f})}this.cache.set(a,d)}return d};export default {Index:G,Charset:D,Encoder:null,Document:null,Worker:null,Resolver:null,IndexedDB:null,Language:{}};
-export const Index=G;export const Charset=D;export const Encoder=null;export const Document=null;export const Worker=null;export const Resolver=null;export const IndexedDB=null;export const Language={};
\ No newline at end of file
+function t(){return Object.create(null)}function u(a,b){return b.length-a.length};function v(a){this.limit=a&&!0!==a?a:1E3;this.cache=new Map;this.B=""}v.prototype.set=function(a,b){this.cache.set(this.B=a,b);this.cache.size>this.limit&&this.cache.delete(this.cache.keys().next().value)};v.prototype.get=function(a){const b=this.cache.get(a);b&&this.B!==a&&(this.cache.delete(a),this.cache.set(this.B=a,b));return b};v.prototype.remove=function(a){for(const b of this.cache){const c=b[0];b[1].includes(a)&&this.cache.delete(c)}};
+v.prototype.clear=function(){this.cache.clear();this.B=""};const w=new Map([["b","p"],["v","f"],["w","f"],["z","s"],["x","s"],["d","t"],["n","m"],["c","k"],["g","k"],["j","k"],["q","k"],["i","e"],["y","e"],["u","o"]]);const x=new Map([["ai","ei"],["ae","a"],["oe","o"],["ue","u"],["sh","s"],["ch","c"],["th","t"],["ph","f"],["pf","f"]]),z=[/([^aeo])h([aeo$])/g,"$1$2",/([aeo])h([^aeo]|$)/g,"$1$2"];const A={a:"",e:"",i:"",o:"",u:"",y:"",b:1,f:1,p:1,v:1,c:2,g:2,j:2,k:2,q:2,s:2,x:2,z:2,"\u00df":2,d:3,t:3,l:4,m:5,n:5,r:6};const B=/[\x00-\x7F]+/g;const C=/[\x00-\x7F]+/g;const D=/[\x00-\x7F]+/g;var E={LatinExact:{normalize:!1,dedupe:!1},LatinDefault:{normalize:function(a){return a.toLowerCase()},dedupe:!1},LatinSimple:{normalize:!0,dedupe:!0},LatinBalance:{normalize:!0,dedupe:!0,mapper:w},LatinAdvanced:{normalize:!0,dedupe:!0,mapper:w,replacer:z,matcher:x},LatinExtra:{normalize:!0,dedupe:!0,mapper:w,replacer:z.concat([/(?!^)[aeoy]/g,""]),matcher:x},LatinSoundex:{normalize:!0,dedupe:!1,include:{letter:!0},finalize:function(a){for(let c=0;c<a.length;c++){var b=a[c];let d=b.charAt(0),e=A[d];
+for(let f=1,g;f<b.length&&(g=b.charAt(f),"h"===g||"w"===g||!(g=A[g])||g===e||(d+=g,e=g,4!==d.length));f++);a[c]=d}}},ArabicDefault:{rtl:!0,normalize:!1,dedupe:!0,prepare:function(a){return(""+a).replace(B," ")}},CjkDefault:{normalize:!1,dedupe:!0,split:"",prepare:function(a){return(""+a).replace(C,"")}},CyrillicDefault:{normalize:!1,dedupe:!0,prepare:function(a){return(""+a).replace(D," ")}}};const F={memory:{resolution:1},performance:{resolution:6,fastupdate:!0,context:{depth:1,resolution:3}},match:{tokenize:"forward"},score:{resolution:9,context:{depth:2,resolution:9}}};function G(a){const b="string"===typeof a?a:a.preset;b&&(a=Object.assign({},F[b],a));return a};t();H.prototype.add=function(a,b,c,d){if(b&&(a||0===a)){if(!d&&!c&&this.h.has(a))return this.update(a,b);b=this.encoder.encode(b);if(d=b.length){const q=t(),n=t(),p=this.depth,r=this.resolution;for(let k=0;k<d;k++){let m=b[this.rtl?d-1-k:k];var e=m.length;if(e&&(p||!n[m])){var f=this.score?this.score(b,m,k,null,0):J(r,d,k),g="";switch(this.tokenize){case "full":if(2<e){for(f=0;f<e;f++)for(var h=e;h>f;h--){g=m.substring(f,h);var l=this.score?this.score(b,m,k,g,f):J(r,d,k,e,f);K(this,n,g,l,a,c)}break}case "reverse":if(1<
+e){for(h=e-1;0<h;h--)g=m[h]+g,l=this.score?this.score(b,m,k,g,h):J(r,d,k,e,h),K(this,n,g,l,a,c);g=""}case "forward":if(1<e){for(h=0;h<e;h++)g+=m[h],K(this,n,g,f,a,c);break}default:if(K(this,n,m,f,a,c),p&&1<d&&k<d-1)for(e=t(),g=this.C,f=m,h=Math.min(p+1,d-k),e[f]=1,l=1;l<h;l++)if((m=b[this.rtl?d-1-k-l:k+l])&&!e[m]){e[m]=1;const y=this.score?this.score(b,f,k,m,l):J(g+(d/2>g?0:1),d,k,h-1,l-1),I=this.bidirectional&&m>f;K(this,q,I?f:m,y,a,c,I?m:f)}}}}this.fastupdate||this.h.add(a)}}return this};
+function K(a,b,c,d,e,f,g){let h=g?a.A:a.map,l;b[c]&&g&&(l=b[c])[g]||(g?(b=l||(b[c]=t()),b[g]=1,(l=h.get(g))?h=l:h.set(g,h=new Map)):b[c]=1,(l=h.get(c))?h=l:h.set(c,h=[]),h=h[d]||(h[d]=[]),f&&h.includes(e)||(h.push(e),a.fastupdate&&((b=a.h.get(e))?b.push(h):a.h.set(e,[h]))))}function J(a,b,c,d,e){return c&&1<a?b+(d||0)<=a?c+(e||0):(a-1)/(b+(d||0))*(c+(e||0))+1|0:0};function L(a,b,c){if(1===a.length)return a=a[0],a=c||a.length>b?b?a.slice(c,c+b):a.slice(c):a;let d=[];for(let e=0,f,g;e<a.length;e++)if((f=a[e])&&(g=f.length)){if(c){if(c>=g){c-=g;continue}c<g&&(f=b?f.slice(c,c+b):f.slice(c),g=f.length,c=0)}if(d.length)g>b&&(f=f.slice(0,b),g=f.length),d.push(f);else{if(g>=b)return g>b&&(f=f.slice(0,b)),f;d=[f]}b-=g;if(!b)break}return d.length?d=1<d.length?[].concat.apply([],d):d[0]:d};H.prototype.search=function(a,b,c){c||(b||"object"!==typeof a?"object"===typeof b&&(c=b,b=0):(c=a,a=""));var d=[],e=0;if(c){a=c.query||a;b=c.limit||b;e=c.offset||0;var f=c.context;var g=!1}a=this.encoder.encode(a);c=a.length;b||(b=100);if(1===c)return M.call(this,a[0],"",b,e);f=this.depth&&!1!==f;if(2===c&&f&&!g)return M.call(this,a[0],a[1],b,e);var h=0,l=0;if(1<c){var q=t();const p=[];for(let r=0,k;r<c;r++)if((k=a[r])&&!q[k]){if(g||N(this,k))p.push(k),q[k]=1;else return d;const m=k.length;h=Math.max(h,
+m);l=l?Math.min(l,m):m}a=p;c=a.length}if(!c)return d;q=0;if(1===c)return M.call(this,a[0],"",b,e);if(2===c&&f&&!g)return M.call(this,a[0],a[1],b,e);if(1<c)if(f){var n=a[0];q=1}else 9<h&&3<h/l&&a.sort(u);for(let p,r;q<c;q++){r=a[q];n?(p=N(this,r,n),p=O(p,d,g,this.C,b,e,2===c),g&&!1===p&&d.length||(n=r)):(p=N(this,r),p=O(p,d,g,this.resolution,b,e,1===c));if(p)return p;if(g&&q===c-1){f=d.length;if(!f){if(n){n="";q=-1;continue}return d}if(1===f)return L(d[0],b,e)}}a:{a=d;d=this.resolution;n=g;c=a.length;
+g=[];f=t();for(let p=0,r,k,m,y;p<d;p++)for(l=0;l<c;l++)if(m=a[l],p<m.length&&(r=m[p]))for(q=0;q<r.length;q++)k=r[q],(h=f[k])?f[k]++:(h=0,f[k]=1),y=g[h]||(g[h]=[]),y.push(k);if(a=g.length)if(n){d=[];for(let p=a-1,r=0,k,m;0<=p;p--)if(k=g[p],m=k.length,e>=m)e-=m;else{if(m+r>b||e)k=k.slice(e,b-r+e),m=k.length;d.push(k);r+=m;if(b===r)break}if(1<d.length){g=d;a=[];d=t();f=g.length;for(l=0;l<f;l++)for(n=g[l],h=n.length,q=0;q<h;q++)if(c=n[q],!d[c])if(d[c]=1,e)e--;else if(a.push(c),a.length===b)break;b=a}else b=
+d[0];g=b}else{if(a<c){d=[];break a}g=g[a-1];if(g.length>b||e)g=g.slice(e,b+e)}d=g}return d};function M(a,b,c,d){return(a=N(this,a,b))&&a.length?L(a,c,d):[]}function O(a,b,c,d,e,f,g){let h=[];if(a){d=Math.min(a.length,d);for(let l=0,q=0,n;l<d;l++)if(n=a[l])if(f&&n&&g&&(n.length<=f?(f-=n.length,n=null):(n=n.slice(f),f=0)),n&&(h[l]=n,g&&(q+=n.length,q>=e)))break;if(h.length){if(g)return L(h,e,0);b.push(h);return}}return!c&&h}
+function N(a,b,c){let d;c&&(d=a.bidirectional&&b>c);a=c?(a=a.A.get(d?b:c))&&a.get(d?c:b):a.map.get(b);return a};H.prototype.remove=function(a,b){const c=this.h.size&&(this.fastupdate?this.h.get(a):this.h.has(a));if(c){if(this.fastupdate)for(let d=0,e;d<c.length;d++){if(e=c[d])if(2>e.length)e.pop();else{const f=e.indexOf(a);f===c.length-1?e.pop():e.splice(f,1)}}else P(this.map,a),this.depth&&P(this.A,a);b||this.h.delete(a)}this.cache&&this.cache.remove(a);return this};
+function P(a,b){let c=0;if(a.constructor===Array)for(let d=0,e,f;d<a.length;d++){if((e=a[d])&&e.length)if(f=e.indexOf(b),0<=f){1<e.length?(e.splice(f,1),c++):delete a[d];break}else c++}else for(let d of a){const e=d[0],f=P(d[1],b);f?c+=f:a.delete(e)}return c};function H(a,b){if(!this)return new H(a);a=a?G(a):{};const c=a.context||{},d=a.encode||a.encoder||function(f){return f.toLowerCase().trim().split(/\s+/)};this.encoder=d.encode?d:"object"===typeof d?d:{encode:d};let e;this.resolution=a.resolution||9;this.tokenize=e=a.tokenize||"strict";this.depth="strict"===e&&c.depth||0;this.bidirectional=!1!==c.bidirectional;this.fastupdate=!!a.fastupdate;this.score=a.score||null;e=!1;this.map=new Map;this.A=new Map;this.h=b||(this.fastupdate?new Map:new Set);this.C=
+c.resolution||1;this.rtl=d.rtl||a.rtl||!1;this.cache=(e=a.cache||null)&&new v(e)}H.prototype.clear=function(){this.map.clear();this.A.clear();this.h.clear();this.cache&&this.cache.clear();return this};H.prototype.append=function(a,b){return this.add(a,b,!0)};H.prototype.contain=function(a){return this.h.has(a)};H.prototype.update=function(a,b){if(this.async){const c=this,d=this.remove(a);return d.then?d.then(()=>c.add(a,b)):this.add(a,b)}return this.remove(a).add(a,b)};
+function Q(a){let b=0;if(a.constructor===Array)for(let c=0,d;c<a.length;c++)(d=a[c])&&(b+=d.length);else for(const c of a){const d=c[0],e=Q(c[1]);e?b+=e:a.delete(d)}return b}H.prototype.cleanup=function(){if(!this.fastupdate)return this;Q(this.map);this.depth&&Q(this.A);return this};
+H.prototype.searchCache=function(a,b,c){a=("object"===typeof a?""+a.query:a).toLowerCase();let d=this.cache.get(a);if(!d){d=this.search(a,b,c);if(d.then){const e=this;d.then(function(f){e.cache.set(a,f);return f})}this.cache.set(a,d)}return d};export default {Index:H,Charset:E,Encoder:null,Document:null,Worker:null,Resolver:null,IndexedDB:null,Language:{}};
+export const Index=H;export const Charset=E;export const Encoder=null;export const Document=null;export const Worker=null;export const Resolver=null;export const IndexedDB=null;export const Language={};
\ No newline at end of file
diff --git a/dist/module-debug/intersect.js b/dist/module-debug/intersect.js
index 8c1bbdf..212fd49 100644
--- a/dist/module-debug/intersect.js
+++ b/dist/module-debug/intersect.js
@@ -34,10 +34,6 @@ export function intersect(arrays, resolution, limit, offset, suggest) {
         count;
 
 
-    // if(suggest){
-    //     suggest = [];
-    // }
-
     // alternatively the results could be sorted by length up
     //arrays.sort(sort_by_length_up);
 
@@ -120,7 +116,40 @@ export function intersect(arrays, resolution, limit, offset, suggest) {
                 }
             }
 
-            result = 1 < final.length ? concat(final) : final[0];
+            result = 1 < final.length ? union(final, offset, limit) : final[0];
+        }
+    }
+
+    return result;
+}
+
+function union(arrays, offset, limit) {
+    const result = [],
+          check = create_object();
+
+    let ids,
+        id,
+        arr_len = arrays.length,
+        ids_len;
+
+    for (let i = 0; i < arr_len; i++) {
+
+        ids = arrays[i];
+        ids_len = ids.length;
+
+        for (let j = 0; j < ids_len; j++) {
+            id = ids[j];
+            if (!check[id]) {
+                check[id] = 1;
+                if (offset) {
+                    offset--;
+                } else {
+                    result.push(id);
+                    if (result.length === limit) {
+                        break;
+                    }
+                }
+            }
         }
     }
 
diff --git a/dist/module-min/intersect.js b/dist/module-min/intersect.js
index 2cafffb..ba60987 100644
--- a/dist/module-min/intersect.js
+++ b/dist/module-min/intersect.js
@@ -1 +1 @@
-import{create_object,concat,sort_by_length_up,get_max_len}from"./common.js";export function intersect(a,b,c,d,e){const f=a.length;let g,h,j=[];g=create_object();for(let i,k,l,m,n=0;n<b;n++)for(let b=0;b<f;b++)if(l=a[b],n<l.length&&(i=l[n]))for(let a=0;a<i.length;a++)k=i[a],(h=g[k])?g[k]++:(h=0,g[k]=1),m=j[h]||(j[h]=[]),m.push(k);const k=j.length;if(k)if(!e){if(k<f)return[];j=j[k-1],(j.length>c||d)&&(j=j.slice(d,c+d))}else{const a=[];for(let b,e,f=k-1,g=0;0<=f;f--){if(b=j[f],e=b.length,d>=e){d-=e;continue}if((e+g>c||d)&&(b=b.slice(d,c-g+d),e=b.length),a.push(b),g+=e,c===g)break}j=1<a.length?concat(a):a[0]}return j}export function intersect_union(a,b){const c=create_object(),d=create_object(),e=[];for(let d=0;d<a.length;d++)c[a[d]]=1;for(let f,g=0;g<b.length;g++){f=b[g];for(let a,b=0;b<f.length;b++)a=f[b],c[a]&&!d[a]&&(d[a]=1,e.push(a))}return e}
\ No newline at end of file
+import{create_object,concat,sort_by_length_up,get_max_len}from"./common.js";export function intersect(a,b,c,d,e){const f=a.length;let g,h,j=[];g=create_object();for(let i,k,l,m,n=0;n<b;n++)for(let b=0;b<f;b++)if(l=a[b],n<l.length&&(i=l[n]))for(let a=0;a<i.length;a++)k=i[a],(h=g[k])?g[k]++:(h=0,g[k]=1),m=j[h]||(j[h]=[]),m.push(k);const k=j.length;if(k)if(!e){if(k<f)return[];j=j[k-1],(j.length>c||d)&&(j=j.slice(d,c+d))}else{const a=[];for(let b,e,f=k-1,g=0;0<=f;f--){if(b=j[f],e=b.length,d>=e){d-=e;continue}if((e+g>c||d)&&(b=b.slice(d,c-g+d),e=b.length),a.push(b),g+=e,c===g)break}j=1<a.length?union(a,d,c):a[0]}return j}function union(a,b,c){const d=[],e=create_object();let f,g,h,j=a.length;for(let k=0;k<j;k++){f=a[k],h=f.length;for(let a=0;a<h;a++)if(g=f[a],!e[g])if(e[g]=1,b)b--;else if(d.push(g),d.length===c)break}return d}export function intersect_union(a,b){const c=create_object(),d=create_object(),e=[];for(let d=0;d<a.length;d++)c[a[d]]=1;for(let f,g=0;g<b.length;g++){f=b[g];for(let a,b=0;b<f.length;b++)a=f[b],c[a]&&!d[a]&&(d[a]=1,e.push(a))}return e}
\ No newline at end of file
diff --git a/dist/module/intersect.js b/dist/module/intersect.js
index 8c1bbdf..212fd49 100644
--- a/dist/module/intersect.js
+++ b/dist/module/intersect.js
@@ -34,10 +34,6 @@ export function intersect(arrays, resolution, limit, offset, suggest) {
         count;
 
 
-    // if(suggest){
-    //     suggest = [];
-    // }
-
     // alternatively the results could be sorted by length up
     //arrays.sort(sort_by_length_up);
 
@@ -120,7 +116,40 @@ export function intersect(arrays, resolution, limit, offset, suggest) {
                 }
             }
 
-            result = 1 < final.length ? concat(final) : final[0];
+            result = 1 < final.length ? union(final, offset, limit) : final[0];
+        }
+    }
+
+    return result;
+}
+
+function union(arrays, offset, limit) {
+    const result = [],
+          check = create_object();
+
+    let ids,
+        id,
+        arr_len = arrays.length,
+        ids_len;
+
+    for (let i = 0; i < arr_len; i++) {
+
+        ids = arrays[i];
+        ids_len = ids.length;
+
+        for (let j = 0; j < ids_len; j++) {
+            id = ids[j];
+            if (!check[id]) {
+                check[id] = 1;
+                if (offset) {
+                    offset--;
+                } else {
+                    result.push(id);
+                    if (result.length === limit) {
+                        break;
+                    }
+                }
+            }
         }
     }
 
diff --git a/src/intersect.js b/src/intersect.js
index 79047ea..06a25b1 100644
--- a/src/intersect.js
+++ b/src/intersect.js
@@ -33,10 +33,6 @@ export function intersect(arrays, resolution, limit, offset, suggest) {
     let check;
     let count;
 
-    // if(suggest){
-    //     suggest = [];
-    // }
-
     // alternatively the results could be sorted by length up
     //arrays.sort(sort_by_length_up);
 
@@ -122,7 +118,7 @@ export function intersect(arrays, resolution, limit, offset, suggest) {
             }
 
             result = final.length > 1
-                ? concat(final)
+                ? union(final, offset, limit)
                 : final[0];
         }
     }
@@ -130,6 +126,37 @@ export function intersect(arrays, resolution, limit, offset, suggest) {
     return result;
 }
 
+function union(arrays, offset, limit){
+
+    const result = [];
+    const check = create_object();
+    let ids, id, arr_len = arrays.length, ids_len;
+
+    for(let i = 0; i < arr_len; i++){
+
+        ids = arrays[i];
+        ids_len = ids.length;
+
+        for(let j = 0; j < ids_len; j++){
+            id = ids[j];
+            if(!check[id]){
+                check[id] = 1;
+                if(offset){
+                    offset--;
+                }
+                else{
+                    result.push(id);
+                    if(result.length === limit){
+                        break;
+                    }
+                }
+            }
+        }
+    }
+
+    return result;
+}
+
 //
 // /**
 //  * Implementation based on Object[key] provides better suggestions