1 | 'use strict';
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2 | var $ = require('../internals/export');
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3 | var global = require('../internals/global');
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4 | var IS_PURE = require('../internals/is-pure');
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5 | var DESCRIPTORS = require('../internals/descriptors');
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6 | var NATIVE_SYMBOL = require('../internals/native-symbol');
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7 | var fails = require('../internals/fails');
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8 | var has = require('../internals/has');
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9 | var isArray = require('../internals/is-array');
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10 | var isObject = require('../internals/is-object');
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11 | var anObject = require('../internals/an-object');
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12 | var toObject = require('../internals/to-object');
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13 | var toIndexedObject = require('../internals/to-indexed-object');
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14 | var toPrimitive = require('../internals/to-primitive');
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15 | var createPropertyDescriptor = require('../internals/create-property-descriptor');
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16 | var nativeObjectCreate = require('../internals/object-create');
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17 | var objectKeys = require('../internals/object-keys');
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18 | var getOwnPropertyNamesModule = require('../internals/object-get-own-property-names');
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19 | var getOwnPropertyNamesExternal = require('../internals/object-get-own-property-names-external');
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20 | var getOwnPropertySymbolsModule = require('../internals/object-get-own-property-symbols');
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21 | var getOwnPropertyDescriptorModule = require('../internals/object-get-own-property-descriptor');
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22 | var definePropertyModule = require('../internals/object-define-property');
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23 | var propertyIsEnumerableModule = require('../internals/object-property-is-enumerable');
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24 | var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
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25 | var redefine = require('../internals/redefine');
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26 | var shared = require('../internals/shared');
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27 | var sharedKey = require('../internals/shared-key');
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28 | var hiddenKeys = require('../internals/hidden-keys');
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29 | var uid = require('../internals/uid');
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30 | var wellKnownSymbol = require('../internals/well-known-symbol');
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31 | var wrappedWellKnownSymbolModule = require('../internals/wrapped-well-known-symbol');
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32 | var defineWellKnownSymbol = require('../internals/define-well-known-symbol');
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33 | var setToStringTag = require('../internals/set-to-string-tag');
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34 | var InternalStateModule = require('../internals/internal-state');
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35 | var $forEach = require('../internals/array-iteration').forEach;
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36 |
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37 | var HIDDEN = sharedKey('hidden');
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38 | var SYMBOL = 'Symbol';
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39 | var PROTOTYPE = 'prototype';
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40 | var TO_PRIMITIVE = wellKnownSymbol('toPrimitive');
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41 | var setInternalState = InternalStateModule.set;
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42 | var getInternalState = InternalStateModule.getterFor(SYMBOL);
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43 | var ObjectPrototype = Object[PROTOTYPE];
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44 | var $Symbol = global.Symbol;
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45 | var JSON = global.JSON;
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46 | var nativeJSONStringify = JSON && JSON.stringify;
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47 | var nativeGetOwnPropertyDescriptor = getOwnPropertyDescriptorModule.f;
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48 | var nativeDefineProperty = definePropertyModule.f;
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49 | var nativeGetOwnPropertyNames = getOwnPropertyNamesExternal.f;
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50 | var nativePropertyIsEnumerable = propertyIsEnumerableModule.f;
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51 | var AllSymbols = shared('symbols');
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52 | var ObjectPrototypeSymbols = shared('op-symbols');
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53 | var StringToSymbolRegistry = shared('string-to-symbol-registry');
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54 | var SymbolToStringRegistry = shared('symbol-to-string-registry');
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55 | var WellKnownSymbolsStore = shared('wks');
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56 | var QObject = global.QObject;
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57 |
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58 | var USE_SETTER = !QObject || !QObject[PROTOTYPE] || !QObject[PROTOTYPE].findChild;
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59 |
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60 |
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61 | var setSymbolDescriptor = DESCRIPTORS && fails(function () {
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62 | return nativeObjectCreate(nativeDefineProperty({}, 'a', {
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63 | get: function () { return nativeDefineProperty(this, 'a', { value: 7 }).a; }
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64 | })).a != 7;
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65 | }) ? function (O, P, Attributes) {
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66 | var ObjectPrototypeDescriptor = nativeGetOwnPropertyDescriptor(ObjectPrototype, P);
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67 | if (ObjectPrototypeDescriptor) delete ObjectPrototype[P];
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68 | nativeDefineProperty(O, P, Attributes);
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69 | if (ObjectPrototypeDescriptor && O !== ObjectPrototype) {
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70 | nativeDefineProperty(ObjectPrototype, P, ObjectPrototypeDescriptor);
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71 | }
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72 | } : nativeDefineProperty;
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73 |
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74 | var wrap = function (tag, description) {
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75 | var symbol = AllSymbols[tag] = nativeObjectCreate($Symbol[PROTOTYPE]);
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76 | setInternalState(symbol, {
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77 | type: SYMBOL,
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78 | tag: tag,
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79 | description: description
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80 | });
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81 | if (!DESCRIPTORS) symbol.description = description;
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82 | return symbol;
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83 | };
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84 |
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85 | var isSymbol = NATIVE_SYMBOL && typeof $Symbol.iterator == 'symbol' ? function (it) {
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86 | return typeof it == 'symbol';
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87 | } : function (it) {
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88 | return Object(it) instanceof $Symbol;
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89 | };
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90 |
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91 | var $defineProperty = function defineProperty(O, P, Attributes) {
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92 | if (O === ObjectPrototype) $defineProperty(ObjectPrototypeSymbols, P, Attributes);
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93 | anObject(O);
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94 | var key = toPrimitive(P, true);
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95 | anObject(Attributes);
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96 | if (has(AllSymbols, key)) {
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97 | if (!Attributes.enumerable) {
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98 | if (!has(O, HIDDEN)) nativeDefineProperty(O, HIDDEN, createPropertyDescriptor(1, {}));
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99 | O[HIDDEN][key] = true;
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100 | } else {
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101 | if (has(O, HIDDEN) && O[HIDDEN][key]) O[HIDDEN][key] = false;
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102 | Attributes = nativeObjectCreate(Attributes, { enumerable: createPropertyDescriptor(0, false) });
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103 | } return setSymbolDescriptor(O, key, Attributes);
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104 | } return nativeDefineProperty(O, key, Attributes);
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105 | };
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106 |
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107 | var $defineProperties = function defineProperties(O, Properties) {
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108 | anObject(O);
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109 | var properties = toIndexedObject(Properties);
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110 | var keys = objectKeys(properties).concat($getOwnPropertySymbols(properties));
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111 | $forEach(keys, function (key) {
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112 | if (!DESCRIPTORS || $propertyIsEnumerable.call(properties, key)) $defineProperty(O, key, properties[key]);
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113 | });
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114 | return O;
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115 | };
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116 |
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117 | var $create = function create(O, Properties) {
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118 | return Properties === undefined ? nativeObjectCreate(O) : $defineProperties(nativeObjectCreate(O), Properties);
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119 | };
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120 |
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121 | var $propertyIsEnumerable = function propertyIsEnumerable(V) {
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122 | var P = toPrimitive(V, true);
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123 | var enumerable = nativePropertyIsEnumerable.call(this, P);
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124 | if (this === ObjectPrototype && has(AllSymbols, P) && !has(ObjectPrototypeSymbols, P)) return false;
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125 | return enumerable || !has(this, P) || !has(AllSymbols, P) || has(this, HIDDEN) && this[HIDDEN][P] ? enumerable : true;
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126 | };
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127 |
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128 | var $getOwnPropertyDescriptor = function getOwnPropertyDescriptor(O, P) {
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129 | var it = toIndexedObject(O);
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130 | var key = toPrimitive(P, true);
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131 | if (it === ObjectPrototype && has(AllSymbols, key) && !has(ObjectPrototypeSymbols, key)) return;
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132 | var descriptor = nativeGetOwnPropertyDescriptor(it, key);
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133 | if (descriptor && has(AllSymbols, key) && !(has(it, HIDDEN) && it[HIDDEN][key])) {
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134 | descriptor.enumerable = true;
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135 | }
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136 | return descriptor;
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137 | };
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138 |
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139 | var $getOwnPropertyNames = function getOwnPropertyNames(O) {
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140 | var names = nativeGetOwnPropertyNames(toIndexedObject(O));
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141 | var result = [];
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142 | $forEach(names, function (key) {
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143 | if (!has(AllSymbols, key) && !has(hiddenKeys, key)) result.push(key);
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144 | });
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145 | return result;
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146 | };
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147 |
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148 | var $getOwnPropertySymbols = function getOwnPropertySymbols(O) {
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149 | var IS_OBJECT_PROTOTYPE = O === ObjectPrototype;
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150 | var names = nativeGetOwnPropertyNames(IS_OBJECT_PROTOTYPE ? ObjectPrototypeSymbols : toIndexedObject(O));
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151 | var result = [];
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152 | $forEach(names, function (key) {
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153 | if (has(AllSymbols, key) && (!IS_OBJECT_PROTOTYPE || has(ObjectPrototype, key))) {
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154 | result.push(AllSymbols[key]);
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155 | }
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156 | });
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157 | return result;
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158 | };
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159 |
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160 |
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161 |
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162 | if (!NATIVE_SYMBOL) {
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163 | $Symbol = function Symbol() {
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164 | if (this instanceof $Symbol) throw TypeError('Symbol is not a constructor');
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165 | var description = !arguments.length || arguments[0] === undefined ? undefined : String(arguments[0]);
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166 | var tag = uid(description);
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167 | var setter = function (value) {
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168 | if (this === ObjectPrototype) setter.call(ObjectPrototypeSymbols, value);
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169 | if (has(this, HIDDEN) && has(this[HIDDEN], tag)) this[HIDDEN][tag] = false;
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170 | setSymbolDescriptor(this, tag, createPropertyDescriptor(1, value));
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171 | };
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172 | if (DESCRIPTORS && USE_SETTER) setSymbolDescriptor(ObjectPrototype, tag, { configurable: true, set: setter });
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173 | return wrap(tag, description);
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174 | };
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175 |
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176 | redefine($Symbol[PROTOTYPE], 'toString', function toString() {
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177 | return getInternalState(this).tag;
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178 | });
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179 |
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180 | propertyIsEnumerableModule.f = $propertyIsEnumerable;
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181 | definePropertyModule.f = $defineProperty;
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182 | getOwnPropertyDescriptorModule.f = $getOwnPropertyDescriptor;
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183 | getOwnPropertyNamesModule.f = getOwnPropertyNamesExternal.f = $getOwnPropertyNames;
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184 | getOwnPropertySymbolsModule.f = $getOwnPropertySymbols;
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185 |
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186 | if (DESCRIPTORS) {
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187 |
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188 | nativeDefineProperty($Symbol[PROTOTYPE], 'description', {
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189 | configurable: true,
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190 | get: function description() {
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191 | return getInternalState(this).description;
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192 | }
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193 | });
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194 | if (!IS_PURE) {
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195 | redefine(ObjectPrototype, 'propertyIsEnumerable', $propertyIsEnumerable, { unsafe: true });
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196 | }
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197 | }
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198 |
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199 | wrappedWellKnownSymbolModule.f = function (name) {
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200 | return wrap(wellKnownSymbol(name), name);
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201 | };
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202 | }
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203 |
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204 | $({ global: true, wrap: true, forced: !NATIVE_SYMBOL, sham: !NATIVE_SYMBOL }, {
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205 | Symbol: $Symbol
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206 | });
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207 |
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208 | $forEach(objectKeys(WellKnownSymbolsStore), function (name) {
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209 | defineWellKnownSymbol(name);
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210 | });
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211 |
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212 | $({ target: SYMBOL, stat: true, forced: !NATIVE_SYMBOL }, {
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213 |
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214 |
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215 | 'for': function (key) {
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216 | var string = String(key);
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217 | if (has(StringToSymbolRegistry, string)) return StringToSymbolRegistry[string];
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218 | var symbol = $Symbol(string);
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219 | StringToSymbolRegistry[string] = symbol;
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220 | SymbolToStringRegistry[symbol] = string;
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221 | return symbol;
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222 | },
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223 |
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224 |
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225 | keyFor: function keyFor(sym) {
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226 | if (!isSymbol(sym)) throw TypeError(sym + ' is not a symbol');
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227 | if (has(SymbolToStringRegistry, sym)) return SymbolToStringRegistry[sym];
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228 | },
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229 | useSetter: function () { USE_SETTER = true; },
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230 | useSimple: function () { USE_SETTER = false; }
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231 | });
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232 |
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233 | $({ target: 'Object', stat: true, forced: !NATIVE_SYMBOL, sham: !DESCRIPTORS }, {
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234 |
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235 |
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236 | create: $create,
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237 |
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238 |
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239 | defineProperty: $defineProperty,
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240 |
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241 |
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242 | defineProperties: $defineProperties,
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243 |
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244 |
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245 | getOwnPropertyDescriptor: $getOwnPropertyDescriptor
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246 | });
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247 |
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248 | $({ target: 'Object', stat: true, forced: !NATIVE_SYMBOL }, {
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249 |
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250 |
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251 | getOwnPropertyNames: $getOwnPropertyNames,
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252 |
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253 |
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254 | getOwnPropertySymbols: $getOwnPropertySymbols
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255 | });
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256 |
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257 |
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258 |
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259 | $({ target: 'Object', stat: true, forced: fails(function () { getOwnPropertySymbolsModule.f(1); }) }, {
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260 | getOwnPropertySymbols: function getOwnPropertySymbols(it) {
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261 | return getOwnPropertySymbolsModule.f(toObject(it));
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262 | }
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263 | });
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264 |
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265 |
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266 |
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267 | JSON && $({ target: 'JSON', stat: true, forced: !NATIVE_SYMBOL || fails(function () {
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268 | var symbol = $Symbol();
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269 |
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270 | return nativeJSONStringify([symbol]) != '[null]'
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271 |
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272 | || nativeJSONStringify({ a: symbol }) != '{}'
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273 |
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274 | || nativeJSONStringify(Object(symbol)) != '{}';
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275 | }) }, {
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276 | stringify: function stringify(it) {
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277 | var args = [it];
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278 | var index = 1;
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279 | var replacer, $replacer;
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280 | while (arguments.length > index) args.push(arguments[index++]);
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281 | $replacer = replacer = args[1];
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282 | if (!isObject(replacer) && it === undefined || isSymbol(it)) return;
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283 | if (!isArray(replacer)) replacer = function (key, value) {
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284 | if (typeof $replacer == 'function') value = $replacer.call(this, key, value);
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285 | if (!isSymbol(value)) return value;
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286 | };
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287 | args[1] = replacer;
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288 | return nativeJSONStringify.apply(JSON, args);
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289 | }
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290 | });
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291 |
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292 |
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293 |
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294 | if (!$Symbol[PROTOTYPE][TO_PRIMITIVE]) {
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295 | createNonEnumerableProperty($Symbol[PROTOTYPE], TO_PRIMITIVE, $Symbol[PROTOTYPE].valueOf);
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296 | }
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297 |
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298 |
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299 | setToStringTag($Symbol, SYMBOL);
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300 |
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301 | hiddenKeys[HIDDEN] = true;
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