diff --git a/compile.js b/compile.js
index d6ed5d6..d3862fe 100644
--- a/compile.js
+++ b/compile.js
@@ -53,7 +53,7 @@ var parameter = (function(opt){
     return parameter;
 })({
 
-    compilation_level: "ADVANCED_OPTIMIZATIONS",
+    compilation_level: "ADVANCED_OPTIMIZATIONS", //"WHITESPACE"
     use_types_for_optimization: true,
     new_type_inf: true,
     jscomp_warning: "newCheckTypes",
@@ -68,6 +68,7 @@ var parameter = (function(opt){
     output_manifest: "log/manifest.log",
     output_module_dependencies: "log/module_dependencies.log",
     property_renaming_report: "log/renaming_report.log"
+    //formatting: "PRETTY_PRINT"
 });
 
 if(options['RELEASE'] === 'lang'){
diff --git a/flexsearch.compact.js b/flexsearch.compact.js
new file mode 100644
index 0000000..450e0b5
--- /dev/null
+++ b/flexsearch.compact.js
@@ -0,0 +1,682 @@
+/*
+ FlexSearch v0.2.68
+ Copyright 2018 Thomas Wilkerling
+ Released under the Apache 2.0 Licence
+ https://github.com/nextapps-de/flexsearch
+*/
+'use strict';
+(function(){
+    provide("FlexSearch", function factory(){
+        var defaults = {
+            encode: "icase",
+            mode: "forward",
+            suggest: false,
+            cache: false,
+            async: false,
+            worker: false,
+            threshold: 0,
+            depth: 0
+        };
+        var profiles = {
+            "memory": {encode: "extra", mode: "strict", threshold: 7},
+            "speed": {encode: "icase", mode: "strict", threshold: 7, depth: 2},
+            "match": {encode: "extra", mode: "full"},
+            "score": {encode: "extra", mode: "strict", threshold: 5, depth: 4},
+            "balance": {encode: "balance", mode: "ngram", threshold: 6, depth: 3},
+            "fastest": {encode: "icase", mode: "strict", threshold: 9, depth: 1}
+        };
+        var globalMatcher = [];
+        var idCounter = 0;
+        var regexSplit = regex("[ -/]");
+        var filter = createObject();
+        var stemmer = createObject();
+        var indexBlacklist = function(){
+            var array = Object.getOwnPropertyNames({}.__proto__);
+            var map = createObject();
+            for(var i = 0; i < array.length; i++){
+                map[array[i]] = 1;
+            }
+            return map;
+        }();
+
+        function FlexSearch(options){
+            if(typeof options === "string" && !indexBlacklist[options]){
+                options = profiles[options];
+            }
+            options || (options = defaults);
+            this.id = options["id"] || idCounter++;
+            this.init(options);
+            registerProperty(this, "index", function(){
+                return this._ids;
+            });
+            registerProperty(this, "length", function(){
+                return Object.keys(this._ids).length;
+            });
+        }
+
+        FlexSearch.new = function(options){
+            return new this(options);
+        };
+        FlexSearch.create = function(options){
+            return FlexSearch.new(options);
+        };
+        FlexSearch.registerMatcher = function(matcher){
+            for(var key in matcher){
+                if(matcher.hasOwnProperty(key)){
+                    globalMatcher.push(regex(key), matcher[key]);
+                }
+            }
+            return this;
+        };
+        FlexSearch.registerEncoder = function(name, encoder){
+            if(!indexBlacklist[name]){
+                globalEncoder[name] = encoder;
+            }
+            return this;
+        };
+        FlexSearch.registerLanguage = function(lang, languagePack){
+            if(!indexBlacklist[lang]){
+                filter[lang] = languagePack["filter"];
+                stemmer[lang] = languagePack["stemmer"];
+            }
+            return this;
+        };
+        FlexSearch.encode = function(name, value){
+            if(indexBlacklist[name]){
+                return value;
+            }
+            else{
+                return globalEncoder[name].call(globalEncoder, value);
+            }
+        };
+        FlexSearch.prototype.init = function(options){
+            this._matcher = [];
+            options || (options = defaults);
+            var custom = options["profile"];
+            var profile = custom && !indexBlacklist[custom] ? profiles[custom] : createObject();
+            this.mode = options["mode"] || profile.mode || this.mode || defaults.mode;
+            this.threshold = options["threshold"] || profile.threshold || this.threshold || defaults.threshold;
+            this.depth = options["depth"] || profile.depth || this.depth || defaults.depth;
+            this.suggest = options["suggest"] || this.suggest || defaults.suggest;
+            custom = options["encode"] || profile.encode;
+            this.encoder = custom && !indexBlacklist[custom] && globalEncoder[custom] || (typeof custom === "function" ? custom : this.encoder || false);
+            if(custom = options["matcher"]){
+                this.addMatcher(custom);
+            }
+            if((custom = options["filter"]) && !indexBlacklist[custom]){
+                this.filter = initFilter(filter[custom] || custom, this.encoder);
+            }
+            if((custom = options["stemmer"]) && !indexBlacklist[custom]){
+                this.stemmer = initStemmer(stemmer[custom] || custom, this.encoder);
+            }
+            this._map = createObject(10);
+            this._ctx = createObject();
+            this._ids = createObject();
+            this._stack = createObject();
+            this._stackKeys = [];
+            this._timer = null;
+            return this;
+        };
+        FlexSearch.prototype.encode = function(value){
+            if(value && globalMatcher.length){
+                value = replace(value, globalMatcher);
+            }
+            if(value && this._matcher.length){
+                value = replace(value, this._matcher);
+            }
+            if(value && this.encoder){
+                value = this.encoder.call(globalEncoder, value);
+            }
+            if(value && this.stemmer){
+                value = replace(value, this.stemmer);
+            }
+            return value;
+        };
+        FlexSearch.prototype.addMatcher = function(custom){
+            var matcher = this._matcher;
+            for(var key in custom){
+                if(custom.hasOwnProperty(key)){
+                    matcher.push(regex(key), custom[key]);
+                }
+            }
+            return this;
+        };
+        FlexSearch.prototype.add = function(id, content, _skipUpdate){
+            if(typeof content === "string" && content && (id && !indexBlacklist[id] || id === 0)){
+                if(this._ids[id] && !_skipUpdate){
+                    this.update(id, content);
+                }
+                else{
+                    content = this.encode(content);
+                    if(!content.length){
+                        return this;
+                    }
+                    var tokenizer = this.mode;
+                    var words = typeof tokenizer === "function" ? tokenizer(content) : tokenizer === "ngram" ? ngram(content) : content.split(regexSplit);
+                    var dupes = createObject();
+                    dupes["_ctx"] = createObject();
+                    var threshold = this.threshold;
+                    var depth = this.depth;
+                    var map = this._map;
+                    var wordLength = words.length;
+                    for(var i = 0; i < wordLength; i++){
+                        var value = words[i];
+                        if(value){
+                            var length = value.length;
+                            var contextScore = (wordLength - i) / wordLength;
+                            switch(tokenizer){
+                                case "reverse":
+                                case "both":
+                                    var tmp = "";
+                                    for(var a = length - 1; a >= 1; a--){
+                                        tmp = value[a] + tmp;
+                                        addIndex(map, dupes, tmp, id, (length - a) / length, contextScore, threshold);
+                                    }
+                                case "forward":
+                                    var tmp = "";
+                                    for(var a = 0; a < length; a++){
+                                        tmp += value[a];
+                                        addIndex(map, dupes, tmp, id, 1, contextScore, threshold);
+                                    }
+                                    break;
+                                case "full":
+                                    var tmp = "";
+                                    for(var x = 0; x < length; x++){
+                                        var partialScore = (length - x) / length;
+                                        for(var y = length; y > x; y--){
+                                            tmp = value.substring(x, y);
+                                            addIndex(map, dupes, tmp, id, partialScore, contextScore, threshold);
+                                        }
+                                    }
+                                    break;
+                                case "strict":
+                                case "ngram":
+                                default:
+                                    var score = addIndex(map, dupes, value, id, 1, contextScore, threshold);
+                                    if(depth && wordLength > 1 && score >= threshold){
+                                        var ctxDupes = dupes["_ctx"][value] || (dupes["_ctx"][value] = createObject());
+                                        var ctxTmp = this._ctx[value] || (this._ctx[value] = createObject(10));
+                                        var x = i - depth;
+                                        var y = i + depth + 1;
+                                        if(x < 0){
+                                            x = 0;
+                                        }
+                                        if(y > wordLength){
+                                            y = wordLength;
+                                        }
+                                        for(; x < y; x++){
+                                            if(x !== i){
+                                                addIndex(ctxTmp, ctxDupes, words[x], id, 0, 10 - (x < i ? i - x : x - i), threshold);
+                                            }
+                                        }
+                                    }
+                                    break;
+                            }
+                        }
+                    }
+                    this._ids[id] = "1";
+                }
+            }
+            return this;
+        };
+        FlexSearch.prototype.update = function(id, content){
+            if(this._ids[id] && content && typeof content === "string"){
+                this.remove(id);
+                this.add(id, content, true);
+            }
+            return this;
+        };
+        FlexSearch.prototype.remove = function(id){
+            if(this._ids[id] && !indexBlacklist[id]){
+                for(var z = 0; z < 10; z++){
+                    removeIndex(this._map[z], id);
+                }
+                if(this.depth){
+                    removeIndex(this._ctx, id);
+                }
+                delete this._ids[id];
+            }
+            return this;
+        };
+        FlexSearch.prototype.search = function(query, limit, callback){
+            var threshold;
+            var result = [];
+            if(query && typeof query === "object"){
+                callback = query["callback"] || limit;
+                limit = query["limit"];
+                threshold = query["threshold"];
+                query = query["query"];
+            }
+            threshold = (threshold || this.threshold || 0) | 0;
+            if(typeof limit === "function"){
+                callback = limit;
+                limit = 1000;
+            }
+            else{
+                limit || (limit = 1000);
+            }
+            if(callback){
+                var self = this;
+                queue(function(){
+                    callback(self.search(query, limit));
+                    self = null;
+                }, 1, "search-" + this.id);
+                return null;
+            }
+            if(!query || typeof query !== "string"){
+                return result;
+            }
+            var _query = query;
+            _query = this.encode(_query);
+            if(!_query.length){
+                return result;
+            }
+            var tokenizer = this.mode;
+            var words = typeof tokenizer === "function" ? tokenizer(_query) : tokenizer === "ngram" ? ngram(_query) : _query.split(regexSplit);
+            var length = words.length;
+            var found = true;
+            var check = [];
+            var checkWords = createObject();
+            if(length > 1){
+                if(this.depth){
+                    var useContextual = true;
+                    var ctxRoot = words[0];
+                    checkWords[ctxRoot] = "1";
+                }
+                else{
+                    words.sort(sortByLengthDown);
+                }
+            }
+            var ctxMap;
+            if(!useContextual || (ctxMap = this._ctx)[ctxRoot]){
+                for(var a = useContextual ? 1 : 0; a < length; a++){
+                    var value = words[a];
+                    if(value && !checkWords[value]){
+                        var map;
+                        var mapFound = false;
+                        var mapCheck = [];
+                        var count = 0;
+                        for(var z = 9; z >= threshold; z--){
+                            map = (useContextual ? ctxMap[ctxRoot] : this._map)[z][value];
+                            if(map){
+                                mapCheck[count++] = map;
+                                mapFound = true;
+                            }
+                        }
+                        if(!mapFound){
+                            if(!this.suggest){
+                                found = false;
+                                break;
+                            }
+                        }
+                        else{
+                            check[check.length] = count > 1 ? check.concat.apply([], mapCheck) : mapCheck[0];
+                        }
+                        checkWords[value] = "1";
+                    }
+                    ctxRoot = value;
+                }
+            }
+            else{
+                found = false;
+            }
+            if(found){
+                result = intersect(check, limit, this.suggest);
+            }
+            return result;
+        };
+        FlexSearch.prototype.reset = function(){
+            this.destroy();
+            return this.init();
+        };
+        FlexSearch.prototype.destroy = function(){
+            this.filter = this.stemmer = this._scores = this._map = this._ctx = this._ids = this._stack = this._stackKeys = null;
+            return this;
+        };
+        var globalEncoderBalance = function(){
+            var regexWhitespace = regex("\\s\\s+"), regexStrip = regex("[^a-z0-9 ]"), regexSpace = regex("[-/]"),
+                regexVowel = regex("[aeiouy]");
+            var regexPairs = [regexSpace, " ", regexStrip, "", regexWhitespace, " "];
+            return function(value){
+                return collapseRepeatingChars(replace(value.toLowerCase(), regexPairs));
+            };
+        }();
+        var globalEncoderIcase = function(value){
+            return value.toLowerCase();
+        };
+        var globalEncoder = Object.create({
+            "icase": globalEncoderIcase, "simple": function(){
+                var regexWhitespace = regex("\\s\\s+"), regexStrip = regex("[^a-z0-9 ]"), regexSpace = regex("[-/]"),
+                    regexA = regex("[\u00e0\u00e1\u00e2\u00e3\u00e4\u00e5]"),
+                    regexE = regex("[\u00e8\u00e9\u00ea\u00eb]"), regexI = regex("[\u00ec\u00ed\u00ee\u00ef]"),
+                    regexO = regex("[\u00f2\u00f3\u00f4\u00f5\u00f6\u0151]"),
+                    regexU = regex("[\u00f9\u00fa\u00fb\u00fc\u0171]"), regexY = regex("[\u00fd\u0177\u00ff]"),
+                    regexN = regex("\u00f1"), regexC = regex("\u00e7"), regexS = regex("\u00df"),
+                    regexAnd = regex(" & ");
+                var regexPairs = [regexA, "a", regexE, "e", regexI, "i", regexO, "o", regexU, "u", regexY, "y", regexN, "n", regexC, "c", regexS, "s", regexAnd, " and ", regexSpace, " ", regexStrip, "", regexWhitespace, " "];
+                return function(str){
+                    str = replace(str.toLowerCase(), regexPairs);
+                    return str !== " " ? str : "";
+                };
+            }(), "advanced": function(){
+                var regexSpace = regex(" "), regexAe = regex("ae"), regexAi = regex("ai"), regexAy = regex("ay"),
+                    regexEy = regex("ey"), regexOe = regex("oe"), regexUe = regex("ue"), regexIe = regex("ie"),
+                    regexSz = regex("sz"), regexZs = regex("zs"), regexCk = regex("ck"), regexCc = regex("cc"),
+                    regexSh = regex("sh"), regexDt = regex("dt"), regexPh = regex("ph"), regexPf = regex("pf"),
+                    regexOu = regex("ou"), regexUo = regex("uo");
+                var regexPairs = [regexAe, "a", regexAi, "ei", regexAy, "ei", regexEy, "ei", regexOe, "o", regexUe, "u", regexIe, "i", regexSz, "s", regexZs, "s", regexSh, "s", regexCk, "k", regexCc, "k", regexDt, "t", regexPh, "f", regexPf, "f", regexOu, "o", regexUo, "u"];
+                return function(string, _skipPostProcessing){
+                    if(!string){
+                        return string;
+                    }
+                    string = this["simple"](string);
+                    if(string.length > 2){
+                        string = replace(string, regexPairs);
+                    }
+                    if(!_skipPostProcessing){
+                        if(string.length > 1){
+                            string = collapseRepeatingChars(string);
+                        }
+                    }
+                    return string;
+                };
+            }(), "extra": function(){
+                var soundexB = regex("p"), soundexS = regex("z"), soundexK = regex("[cgq]"), soundexM = regex("n"),
+                    soundexT = regex("d"), soundexF = regex("[vw]");
+                var regexVowel = regex("[aeiouy]");
+                var regexPairs = [soundexB, "b", soundexS, "s", soundexK, "k", soundexM, "m", soundexT, "t", soundexF, "f", regexVowel, ""];
+                return function(str){
+                    if(!str){
+                        return str;
+                    }
+                    str = this["advanced"](str, true);
+                    if(str.length > 1){
+                        str = str.split(" ");
+                        for(var i = 0; i < str.length; i++){
+                            var current = str[i];
+                            if(current.length > 1){
+                                str[i] = current[0] + replace(current.substring(1), regexPairs);
+                            }
+                        }
+                        str = str.join(" ");
+                        str = collapseRepeatingChars(str);
+                    }
+                    return str;
+                };
+            }(), "balance": globalEncoderBalance
+        });
+        var queue = null;
+        return FlexSearch;
+
+        function registerProperty(obj, key, fn){
+            Object.defineProperty(obj, key, {get: fn});
+        }
+
+        function regex(str){
+            return new RegExp(str, "g");
+        }
+
+        function replace(str, regex, replacement){
+            if(typeof replacement === "undefined"){
+                for(var i = 0; i < regex.length; i += 2){
+                    str = str.replace(regex[i], regex[i + 1]);
+                }
+                return str;
+            }
+            else{
+                return str.replace(regex, replacement);
+            }
+        }
+
+        function addIndex(map, dupes, tmp, id, partialScore, contextScore, threshold){
+            if(typeof dupes[tmp] === "undefined"){
+                var score = partialScore ? (9 - (threshold || 6)) * contextScore + (threshold || 6) * partialScore : contextScore;
+                dupes[tmp] = score;
+                if(score >= threshold){
+                    var arr = map[score + 0.5 | 0];
+                    arr = arr[tmp] || (arr[tmp] = []);
+                    arr[arr.length] = id;
+                }
+            }
+            return score || dupes[tmp];
+        }
+
+        function removeIndex(map, id){
+            if(map){
+                var keys = Object.keys(map);
+                for(var i = 0, lengthKeys = keys.length; i < lengthKeys; i++){
+                    var key = keys[i];
+                    var tmp = map[key];
+                    if(tmp){
+                        for(var a = 0, lengthMap = tmp.length; a < lengthMap; a++){
+                            if(tmp[a] === id){
+                                if(lengthMap === 1){
+                                    delete map[key];
+                                }
+                                else{
+                                    tmp.splice(a, 1);
+                                }
+                                break;
+                            }
+                            else{
+                                if(typeof tmp[a] === "object"){
+                                    removeIndex(tmp[a], id);
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        function ngram(value){
+            var parts = [];
+            if(!value){
+                return parts;
+            }
+            var countVowels = 0, countLiteral = 0, countParts = 0;
+            var tmp = "";
+            var length = value.length;
+            for(var i = 0; i < length; i++){
+                var char = value[i];
+                var charIsVowel = char === "a" || char === "e" || char === "i" || char === "o" || char === "u" || char === "y";
+                if(charIsVowel){
+                    countVowels++;
+                }
+                else{
+                    countLiteral++;
+                }
+                if(char !== " "){
+                    tmp += char;
+                }
+                if(char === " " || countVowels >= (length > 8 ? 2 : 1) && countLiteral >= 2 || countVowels >= 2 && countLiteral >= (length > 8 ? 2 : 1) || i === length - 1){
+                    if(tmp){
+                        if(parts[countParts] && tmp.length > 2){
+                            countParts++;
+                        }
+                        if(parts[countParts]){
+                            parts[countParts] += tmp;
+                        }
+                        else{
+                            parts[countParts] = tmp;
+                        }
+                        if(char === " "){
+                            countParts++;
+                        }
+                        tmp = "";
+                    }
+                    countVowels = 0;
+                    countLiteral = 0;
+                }
+            }
+            return parts;
+        }
+
+        function collapseRepeatingChars(string){
+            var collapsedString = "", charPrev = "", charNext = "";
+            for(var i = 0; i < string.length; i++){
+                var char = string[i];
+                if(char !== charPrev){
+                    if(i && char === "h"){
+                        var charPrevIsVowel = charPrev === "a" || charPrev === "e" || charPrev === "i" || charPrev === "o" || charPrev === "u" || charPrev === "y";
+                        var charNextIsVowel = charNext === "a" || charNext === "e" || charNext === "i" || charNext === "o" || charNext === "u" || charNext === "y";
+                        if(charPrevIsVowel && charNextIsVowel || charPrev === " "){
+                            collapsedString += char;
+                        }
+                    }
+                    else{
+                        collapsedString += char;
+                    }
+                }
+                charNext = i === string.length - 1 ? "" : string[i + 1];
+                charPrev = char;
+            }
+            return collapsedString;
+        }
+
+        function initFilter(words, encoder){
+            var final = createObject();
+            if(words){
+                for(var i = 0; i < words.length; i++){
+                    var word = encoder ? encoder.call(globalEncoder, words[i]) : words[i];
+                    final[word] = String.fromCharCode(65000 - words.length + i);
+                }
+            }
+            return final;
+        }
+
+        function initStemmer(stemmer, encoder){
+            var final = [];
+            if(stemmer){
+                for(var key in stemmer){
+                    if(stemmer.hasOwnProperty(key)){
+                        var tmp = encoder ? encoder.call(globalEncoder, key) : key;
+                        final.push(regex("(?=.{" + (tmp.length + 3) + ",})" + tmp + "$"), encoder ? encoder.call(globalEncoder, stemmer[key]) : stemmer[key]);
+                    }
+                }
+            }
+            return final;
+        }
+
+        function sortByLengthDown(a, b){
+            var diff = a.length - b.length;
+            return diff < 0 ? 1 : diff > 0 ? -1 : 0;
+        }
+
+        function sortByLengthUp(a, b){
+            var diff = a.length - b.length;
+            return diff < 0 ? -1 : diff > 0 ? 1 : 0;
+        }
+
+        function intersect(arrays, limit, suggest){
+            var result = [];
+            var suggestions = [];
+            var lengthZ = arrays.length;
+            if(lengthZ > 1){
+                arrays.sort(sortByLengthUp);
+                var check = createObject();
+                var arr = arrays[0];
+                var length = arr.length;
+                var i = 0;
+                while(i < length){
+                    check[arr[i++]] = 1;
+                }
+                var tmp, count = 0;
+                var z = 1;
+                while(z < lengthZ){
+                    var found = false;
+                    var isFinalLoop = z === lengthZ - 1;
+                    suggestions = [];
+                    arr = arrays[z];
+                    length = arr.length;
+                    i = -1;
+                    while(i < length){
+                        var checkVal = check[tmp = arr[++i]];
+                        if(checkVal === z){
+                            if(isFinalLoop){
+                                result[count++] = tmp;
+                                if(limit && count === limit){
+                                    return result;
+                                }
+                            }
+                            found = true;
+                            check[tmp] = z + 1;
+                        }
+                        else{
+                            if(suggest){
+                                var currentSuggestion = suggestions[checkVal] || (suggestions[checkVal] = []);
+                                currentSuggestion[currentSuggestion.length] = tmp;
+                            }
+                        }
+                    }
+                    if(!found && !suggest){
+                        break;
+                    }
+                    z++;
+                }
+                if(suggest){
+                    limit || (limit = 1000);
+                    count = result.length;
+                    length = suggestions.length;
+                    if(count < limit && length){
+                        for(z = length - 1; z >= 0; z--){
+                            tmp = suggestions[z];
+                            if(tmp){
+                                for(i = 0; i < tmp.length; i++){
+                                    result[count++] = tmp[i];
+                                    if(limit && count === limit){
+                                        return result;
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+            else{
+                if(lengthZ){
+                    result = arrays[0];
+                    if(limit && result.length > limit){
+                        result = result.slice(0, limit);
+                    }
+                }
+            }
+            return result;
+        }
+
+        function createObject(count){
+            if(count){
+                var array = new Array(count);
+                for(var i = 0; i < count; i++){
+                    array[i] = createObject();
+                }
+                return array;
+            }
+            else{
+                return Object.create(null);
+            }
+        }
+    }(), this);
+
+    function provide(name, factory, root){
+        var prop;
+        if((prop = root["define"]) && prop["amd"]){
+            prop([], function(){
+                return factory;
+            });
+        }
+        else{
+            if(prop = root["modules"]){
+                prop[name.toLowerCase()] = factory;
+            }
+            else{
+                if(typeof module !== "undefined"){
+                    module.exports = factory;
+                }
+                else{
+                    root[name] = factory;
+                }
+            }
+        }
+    }
+}).call(this);
diff --git a/flexsearch.js b/flexsearch.js
index 4353b73..f3031df 100644
--- a/flexsearch.js
+++ b/flexsearch.js
@@ -129,7 +129,7 @@ var SUPPORT_ASYNC = true;
         var filter = createObject();
         var stemmer = createObject();
 
-        /**  @const {Object} */
+        /**  @const {Object<string|number, number>} */
         var indexBlacklist = (function(){
 
             var array = Object.getOwnPropertyNames(/** @type {!Array} */ ({}.__proto__));
@@ -328,7 +328,7 @@ var SUPPORT_ASYNC = true;
 
                             //self._ids_count[i] = 0;
 
-                            self._worker[i] = add_worker(self.id, i, options /*|| defaults*/, function(id, query, result, limit){
+                            self._worker[i] = addWorker(self.id, i, options /*|| defaults*/, function(id, query, result, limit){
 
                                 if(self._taskCompleted === self.worker){
 
@@ -449,7 +449,7 @@ var SUPPORT_ASYNC = true;
 
             // initialize primary index
 
-            this._map = createObject(null, void 0, 10);
+            this._map = createObject(10);
             this._ctx = createObject();
             this._ids = createObject();
             this._stack = createObject();
@@ -651,10 +651,8 @@ var SUPPORT_ASYNC = true;
                         )
                     );
 
-                    var dupes = {
-
-                        "_ctx": createObject()
-                    };
+                    var dupes = createObject();
+                        dupes["_ctx"] = createObject();
 
                     var threshold = this.threshold;
                     var depth = this.depth;
@@ -666,7 +664,7 @@ var SUPPORT_ASYNC = true;
                     for(var i = 0; i < wordLength; i++){
 
                         /** @type {string} */
-                        var value = "" + words[i];
+                        var value = words[i];
 
                         if(value){
 
@@ -767,7 +765,7 @@ var SUPPORT_ASYNC = true;
                                     if(depth && (wordLength > 1) && (score >= threshold)){
 
                                         var ctxDupes = dupes["_ctx"][value] || (dupes["_ctx"][value] = createObject());
-                                        var ctxTmp = this._ctx[value] || (this._ctx[value] = createObject(null, void 0, 10));
+                                        var ctxTmp = this._ctx[value] || (this._ctx[value] = createObject(10));
 
                                         var x = i - depth;
                                         var y = i + depth + 1;
@@ -1047,7 +1045,7 @@ var SUPPORT_ASYNC = true;
 
             if(!useContextual || (ctxMap = this._ctx)[ctxRoot]){
 
-                for(var a = useContextual ? 1 : 0; a < length; a++){
+                for(var a = (useContextual ? 1 : 0); a < length; a++){
 
                     var value = words[a];
 
@@ -1265,7 +1263,7 @@ var SUPPORT_ASYNC = true;
             return function(value){
 
                 return collapseRepeatingChars(replace(value.toLowerCase(), regexPairs));
-            }
+            };
         })();
 
         /** @const */
@@ -1642,7 +1640,7 @@ var SUPPORT_ASYNC = true;
 
         function regex(str){
 
-            return new RegExp("" + str, "g");
+            return new RegExp(str, "g");
         }
 
         /**
@@ -2431,13 +2429,20 @@ var SUPPORT_ASYNC = true;
         }
 
         /**
-         * @param {Object|null=} prototype
-         * @param {Object=} properties
+         * @type {Function}
+         * @const
+         * @final
+         */
+
+        //var emptyObject = new Function("var o={};o.__proto__=null;return o;");
+
+        /**
+         * https://jsperf.com/comparison-object-index-type
          * @param {number=} count
          * @returns {Object|Array<Object>}
          */
 
-        function createObject(prototype, properties, count){
+        function createObject(count){
 
             if(count){
 
@@ -2445,18 +2450,18 @@ var SUPPORT_ASYNC = true;
 
                 for(var i = 0; i < count; i++){
 
-                    array[i] = createObject(prototype, properties);
+                    array[i] = createObject();
                 }
 
                 return array;
             }
             else{
 
-                return Object.create(prototype || null, properties);
+                return Object.create(null); //emptyObject();
             }
         }
 
-        function add_worker(id, core, options, callback){
+        function addWorker(id, core, options, callback){
 
             var thread = registerWorker(
 
diff --git a/flexsearch.light.js b/flexsearch.light.js
index 84ee70c..2737d3d 100644
--- a/flexsearch.light.js
+++ b/flexsearch.light.js
@@ -4,17 +4,17 @@
  Released under the Apache 2.0 Licence
  https://github.com/nextapps-de/flexsearch
 */
-'use strict';(function(e,x,p){var t;(t=p.define)&&t.amd?t([],function(){return x}):(t=p.modules)?t[e.toLowerCase()]=x:"undefined"!==typeof module?module.exports=x:p[e]=x})("FlexSearch",function(){function e(a){"string"!==typeof a||v[a]||(a=D[a]);a||(a=y);this.id=a.id||I++;this.init(a);x(this,"index",function(){return this.a});x(this,"length",function(){return Object.keys(this.a).length})}function x(a,b,c){Object.defineProperty(a,b,{get:c})}function p(a){return new RegExp(a,"g")}function t(a,b,c){if("undefined"===
-typeof c){for(c=0;c<b.length;c+=2)a=a.replace(b[c],b[c+1]);return a}return a.replace(b,c)}function A(a,b,c,d,f,m,g){if("undefined"===typeof b[c]){var h=f?(9-(g||6))*m+(g||6)*f:m;b[c]=h;h>=g&&(a=a[h+.5|0],a=a[c]||(a[c]=[]),a[a.length]=d)}return h||b[c]}function B(a,b){if(a)for(var c=Object.keys(a),d=0,f=c.length;d<f;d++){var m=c[d],g=a[m];if(g)for(var h=0,k=g.length;h<k;h++)if(g[h]===b){1===k?delete a[m]:g.splice(h,1);break}else"object"===typeof g[h]&&B(g[h],b)}}function E(a){var b=[];if(!a)return b;
-for(var c=0,d=0,f=0,m="",g=a.length,h=0;h<g;h++){var k=a[h];"a"===k||"e"===k||"i"===k||"o"===k||"u"===k||"y"===k?c++:d++;" "!==k&&(m+=k);if(" "===k||c>=(8<g?2:1)&&2<=d||2<=c&&d>=(8<g?2:1)||h===g-1)m&&(b[f]&&2<m.length&&f++,b[f]=b[f]?b[f]+m:m," "===k&&f++,m=""),d=c=0}return b}function J(a,b){a=a.length-b.length;return 0>a?1:0<a?-1:0}function K(a,b){a=a.length-b.length;return 0>a?-1:0<a?1:0}function L(a,b,c){var d=[],f=[],m=a.length;if(1<m){a.sort(K);for(var g=u(),h=a[0],k=h.length,z=0;z<k;)g[h[z++]]=
-1;for(var q,e=0,n=1;n<m;){var l=!1,p=n===m-1;f=[];h=a[n];k=h.length;for(z=-1;z<k;){var r=g[q=h[++z]];if(r===n){if(p&&(d[e++]=q,b&&e===b))return d;l=!0;g[q]=n+1}else c&&(r=f[r]||(f[r]=[]),r[r.length]=q)}if(!l&&!c)break;n++}if(c&&(b||(b=1E3),e=d.length,k=f.length,e<b&&k))for(n=k-1;0<=n;n--)if(q=f[n])for(z=0;z<q.length;z++)if(d[e++]=q[z],b&&e===b)return d}else m&&(d=a[0],b&&d.length>b&&(d=d.slice(0,b)));return d}function u(a,b,c){if(c){for(var d=Array(c),f=0;f<c;f++)d[f]=u(a,b);return d}return Object.create(a||
-null,b)}var y={encode:"icase",mode:"forward",f:!1,cache:!1,async:!1,i:!1,threshold:0,depth:0},D={memory:{encode:"extra",mode:"strict",threshold:7},speed:{encode:"icase",mode:"strict",threshold:7,depth:2},match:{encode:"extra",mode:"full"},score:{encode:"extra",mode:"strict",threshold:5,depth:4},balance:{encode:"balance",mode:"ngram",threshold:6,depth:3},fastest:{encode:"icase",mode:"strict",threshold:9,depth:1}},C=[],I=0,F=p("[ -/]"),G=u(),H=u(),v=function(){for(var a=Object.getOwnPropertyNames({}.__proto__),
-b=u(),c=0;c<a.length;c++)b[a[c]]=1;return b}();e.new=function(a){return new this(a)};e.create=function(a){return e.new(a)};e.registerMatcher=function(a){for(var b in a)a.hasOwnProperty(b)&&C.push(p(b),a[b]);return this};e.registerEncoder=function(a,b){v[a]||(w[a]=b);return this};e.registerLanguage=function(a,b){v[a]||(G[a]=b.filter,H[a]=b.stemmer);return this};e.encode=function(a,b){return v[a]?b:w[a].call(w,b)};e.prototype.init=function(a){this.h=[];a||(a=y);var b=a.profile;b=b&&!v[b]?D[b]:u();this.mode=
-a.mode||b.mode||this.mode||y.mode;this.threshold=a.threshold||b.threshold||this.threshold||y.threshold;this.depth=a.depth||b.depth||this.depth||y.depth;this.f=a.suggest||this.f||y.f;this.c=(b=a.encode||b.encode)&&!v[b]&&w[b]||("function"===typeof b?b:this.c||!1);(b=a.matcher)&&this.addMatcher(b);if((b=a.filter)&&!v[b]){var c=G[b]||b,d=this.c,f=u();if(c)for(var m=0;m<c.length;m++){var g=d?d.call(w,c[m]):c[m];f[g]=String.fromCharCode(65E3-c.length+m)}this.filter=f}if((b=a.stemmer)&&!v[b]){a=H[b]||b;
-b=this.c;c=[];if(a)for(var h in a)a.hasOwnProperty(h)&&(d=b?b.call(w,h):h,c.push(p("(?=.{"+(d.length+3)+",})"+d+"$"),b?b.call(w,a[h]):a[h]));this.stemmer=c}this.g=u(null,void 0,10);this.b=u();this.a=u();u();return this};e.prototype.encode=function(a){a&&C.length&&(a=t(a,C));a&&this.h.length&&(a=t(a,this.h));a&&this.c&&(a=this.c.call(w,a));a&&this.stemmer&&(a=t(a,this.stemmer));return a};e.prototype.addMatcher=function(a){var b=this.h,c;for(c in a)a.hasOwnProperty(c)&&b.push(p(c),a[c]);return this};
-e.prototype.add=function(a,b,c){if("string"===typeof b&&b&&(a&&!v[a]||0===a))if(this.a[a]&&!c)this.update(a,b);else{b=this.encode(b);if(!b.length)return this;c=this.mode;b="function"===typeof c?c(b):"ngram"===c?E(b):b.split(F);for(var d={_ctx:u()},f=this.threshold,m=this.depth,g=this.g,h=b.length,k=0;k<h;k++){var e=""+b[k];if(e){var q=e.length,p=(h-k)/h;switch(c){case "reverse":case "both":for(var n="",l=q-1;1<=l;l--)n=e[l]+n,A(g,d,n,a,(q-l)/q,p,f);case "forward":n="";for(l=0;l<q;l++)n+=e[l],A(g,
-d,n,a,1,p,f);break;case "full":for(l=0;l<q;l++)for(var t=(q-l)/q,r=q;r>l;r--)n=e.substring(l,r),A(g,d,n,a,t,p,f);break;default:if(l=A(g,d,e,a,1,p,f),m&&1<h&&l>=f)for(q=d._ctx[e]||(d._ctx[e]=u()),e=this.b[e]||(this.b[e]=u(null,void 0,10)),l=k-m,r=k+m+1,0>l&&(l=0),r>h&&(r=h);l<r;l++)l!==k&&A(e,q,b[l],a,0,10-(l<k?k-l:l-k),f)}}}this.a[a]="1"}return this};e.prototype.update=function(a,b){this.a[a]&&b&&"string"===typeof b&&(this.remove(a),this.add(a,b,!0));return this};e.prototype.remove=function(a){if(this.a[a]&&
-!v[a]){for(var b=0;10>b;b++)B(this.g[b],a);this.depth&&B(this.b,a);delete this.a[a]}return this};e.prototype.search=function(a,b,c){var d=[];if(a&&"object"===typeof a){c=a.callback||b;b=a.limit;var f=a.threshold;a=a.query}f=(f||this.threshold||0)|0;"function"===typeof b?(c=b,b=1E3):b||(b=1E3);if(c){var e=this;M(function(){c(e.search(a,b));e=null},1,"search-"+this.id);return null}if(!a||"string"!==typeof a)return d;var g=this.encode(a);if(!g.length)return d;var h=this.mode;g="function"===typeof h?
-h(g):"ngram"===h?E(g):g.split(F);h=g.length;var k=!0,p=[],q=u();if(1<h)if(this.depth){var t=!0,n=g[0];q[n]="1"}else g.sort(J);var l;if(!t||(l=this.b)[n])for(var v=t?1:0;v<h;v++){var r=g[v];if(r&&!q[r]){for(var w,x=!1,y=[],A=0,B=9;B>=f;B--)if(w=(t?l[n]:this.g)[B][r])y[A++]=w,x=!0;if(x)p[p.length]=1<A?p.concat.apply([],y):y[0];else if(!this.f){k=!1;break}q[r]="1"}n=r}else k=!1;k&&(d=L(p,b,this.f));return d};e.prototype.reset=function(){this.destroy();return this.init()};e.prototype.destroy=function(){this.filter=
-this.stemmer=this.g=this.b=this.a=null;return this};var w=Object.create({icase:function(a){return a.toLowerCase()},balance:function(){var a=[p("[-/]")," ",p("[^a-z0-9 ]"),"",p("\\s\\s+")," "];return function(b){b=t(b.toLowerCase(),a);for(var c="",d="",f="",e=0;e<b.length;e++){var g=b[e];if(g!==d)if(e&&"h"===g){if(f="a"===f||"e"===f||"i"===f||"o"===f||"u"===f||"y"===f,("a"===d||"e"===d||"i"===d||"o"===d||"u"===d||"y"===d)&&f||" "===d)c+=g}else c+=g;f=e===b.length-1?"":b[e+1];d=g}return c}}()}),M=null;
-return e}(!1),this);
+'use strict';(function(d,x,p){var t;(t=p.define)&&t.amd?t([],function(){return x}):(t=p.modules)?t[d.toLowerCase()]=x:"undefined"!==typeof module?module.exports=x:p[d]=x})("FlexSearch",function(){function d(a){"string"!==typeof a||v[a]||(a=D[a]);a||(a=y);this.id=a.id||I++;this.init(a);x(this,"index",function(){return this.a});x(this,"length",function(){return Object.keys(this.a).length})}function x(a,b,c){Object.defineProperty(a,b,{get:c})}function p(a){return new RegExp(a,"g")}function t(a,b,c){if("undefined"===
+typeof c){for(c=0;c<b.length;c+=2)a=a.replace(b[c],b[c+1]);return a}return a.replace(b,c)}function A(a,b,c,e,m,k,f){if("undefined"===typeof b[c]){var g=m?(9-(f||6))*k+(f||6)*m:k;b[c]=g;g>=f&&(a=a[g+.5|0],a=a[c]||(a[c]=[]),a[a.length]=e)}return g||b[c]}function B(a,b){if(a)for(var c=Object.keys(a),e=0,m=c.length;e<m;e++){var k=c[e],f=a[k];if(f)for(var g=0,h=f.length;g<h;g++)if(f[g]===b){1===h?delete a[k]:f.splice(g,1);break}else"object"===typeof f[g]&&B(f[g],b)}}function E(a){var b=[];if(!a)return b;
+for(var c=0,e=0,m=0,k="",f=a.length,g=0;g<f;g++){var h=a[g];"a"===h||"e"===h||"i"===h||"o"===h||"u"===h||"y"===h?c++:e++;" "!==h&&(k+=h);if(" "===h||c>=(8<f?2:1)&&2<=e||2<=c&&e>=(8<f?2:1)||g===f-1)k&&(b[m]&&2<k.length&&m++,b[m]=b[m]?b[m]+k:k," "===h&&m++,k=""),e=c=0}return b}function J(a,b){a=a.length-b.length;return 0>a?1:0<a?-1:0}function K(a,b){a=a.length-b.length;return 0>a?-1:0<a?1:0}function L(a,b,c){var e=[],m=[],k=a.length;if(1<k){a.sort(K);for(var f=u(),g=a[0],h=g.length,z=0;z<h;)f[g[z++]]=
+1;for(var q,d=0,n=1;n<k;){var l=!1,p=n===k-1;m=[];g=a[n];h=g.length;for(z=-1;z<h;){var r=f[q=g[++z]];if(r===n){if(p&&(e[d++]=q,b&&d===b))return e;l=!0;f[q]=n+1}else c&&(r=m[r]||(m[r]=[]),r[r.length]=q)}if(!l&&!c)break;n++}if(c&&(b||(b=1E3),d=e.length,h=m.length,d<b&&h))for(n=h-1;0<=n;n--)if(q=m[n])for(z=0;z<q.length;z++)if(e[d++]=q[z],b&&d===b)return e}else k&&(e=a[0],b&&e.length>b&&(e=e.slice(0,b)));return e}function u(a){if(a){for(var b=Array(a),c=0;c<a;c++)b[c]=u();return b}return Object.create(null)}
+var y={encode:"icase",mode:"forward",f:!1,cache:!1,async:!1,i:!1,threshold:0,depth:0},D={memory:{encode:"extra",mode:"strict",threshold:7},speed:{encode:"icase",mode:"strict",threshold:7,depth:2},match:{encode:"extra",mode:"full"},score:{encode:"extra",mode:"strict",threshold:5,depth:4},balance:{encode:"balance",mode:"ngram",threshold:6,depth:3},fastest:{encode:"icase",mode:"strict",threshold:9,depth:1}},C=[],I=0,F=p("[ -/]"),G=u(),H=u(),v=function(){for(var a=Object.getOwnPropertyNames({}.__proto__),
+b=u(),c=0;c<a.length;c++)b[a[c]]=1;return b}();d.new=function(a){return new this(a)};d.create=function(a){return d.new(a)};d.registerMatcher=function(a){for(var b in a)a.hasOwnProperty(b)&&C.push(p(b),a[b]);return this};d.registerEncoder=function(a,b){v[a]||(w[a]=b);return this};d.registerLanguage=function(a,b){v[a]||(G[a]=b.filter,H[a]=b.stemmer);return this};d.encode=function(a,b){return v[a]?b:w[a].call(w,b)};d.prototype.init=function(a){this.h=[];a||(a=y);var b=a.profile;b=b&&!v[b]?D[b]:u();this.mode=
+a.mode||b.mode||this.mode||y.mode;this.threshold=a.threshold||b.threshold||this.threshold||y.threshold;this.depth=a.depth||b.depth||this.depth||y.depth;this.f=a.suggest||this.f||y.f;this.c=(b=a.encode||b.encode)&&!v[b]&&w[b]||("function"===typeof b?b:this.c||!1);(b=a.matcher)&&this.addMatcher(b);if((b=a.filter)&&!v[b]){var c=G[b]||b,e=this.c,m=u();if(c)for(var k=0;k<c.length;k++){var f=e?e.call(w,c[k]):c[k];m[f]=String.fromCharCode(65E3-c.length+k)}this.filter=m}if((b=a.stemmer)&&!v[b]){a=H[b]||b;
+b=this.c;c=[];if(a)for(var g in a)a.hasOwnProperty(g)&&(e=b?b.call(w,g):g,c.push(p("(?=.{"+(e.length+3)+",})"+e+"$"),b?b.call(w,a[g]):a[g]));this.stemmer=c}this.g=u(10);this.b=u();this.a=u();u();return this};d.prototype.encode=function(a){a&&C.length&&(a=t(a,C));a&&this.h.length&&(a=t(a,this.h));a&&this.c&&(a=this.c.call(w,a));a&&this.stemmer&&(a=t(a,this.stemmer));return a};d.prototype.addMatcher=function(a){var b=this.h,c;for(c in a)a.hasOwnProperty(c)&&b.push(p(c),a[c]);return this};d.prototype.add=
+function(a,b,c){if("string"===typeof b&&b&&(a&&!v[a]||0===a))if(this.a[a]&&!c)this.update(a,b);else{b=this.encode(b);if(!b.length)return this;c=this.mode;b="function"===typeof c?c(b):"ngram"===c?E(b):b.split(F);var e=u();e._ctx=u();for(var m=this.threshold,k=this.depth,f=this.g,g=b.length,h=0;h<g;h++){var d=b[h];if(d){var q=d.length,p=(g-h)/g;switch(c){case "reverse":case "both":for(var n="",l=q-1;1<=l;l--)n=d[l]+n,A(f,e,n,a,(q-l)/q,p,m);case "forward":n="";for(l=0;l<q;l++)n+=d[l],A(f,e,n,a,1,p,m);
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diff --git a/package.json b/package.json
index 2f96844..ddb0b21 100644
--- a/package.json
+++ b/package.json
@@ -51,7 +51,7 @@
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     "chai": "^4.1.2",
     "codacy-coverage": "^3.0.0",
-    "coveralls": "^3.0.0",
+    "coveralls": "^3.0.1",
     "google-closure-compiler": "^20180402.0.0",
     "mocha": "^5.1.1",
     "mocha-lcov-reporter": "^1.3.0",