1 | 'use strict';
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2 | var $ = require('../internals/export');
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3 | var getBuiltIn = require('../internals/get-built-in');
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4 | var hasOwn = require('../internals/has-own-property');
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5 | var toString = require('../internals/to-string');
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6 | var shared = require('../internals/shared');
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7 | var NATIVE_SYMBOL_REGISTRY = require('../internals/symbol-registry-detection');
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8 |
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9 | var StringToSymbolRegistry = shared('string-to-symbol-registry');
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10 | var SymbolToStringRegistry = shared('symbol-to-string-registry');
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11 |
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12 |
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13 |
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14 | $({ target: 'Symbol', stat: true, forced: !NATIVE_SYMBOL_REGISTRY }, {
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15 | 'for': function (key) {
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16 | var string = toString(key);
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17 | if (hasOwn(StringToSymbolRegistry, string)) return StringToSymbolRegistry[string];
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18 | var symbol = getBuiltIn('Symbol')(string);
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19 | StringToSymbolRegistry[string] = symbol;
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20 | SymbolToStringRegistry[symbol] = string;
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21 | return symbol;
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22 | }
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23 | });
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