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rOACCT/node_modules/core-js/modules/es.symbol.for.js
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es.symbol.for.js
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			var $ = require('../internals/export');
			var getBuiltIn = require('../internals/get-built-in');
			var hasOwn = require('../internals/has-own-property');
			var toString = require('../internals/to-string');
			var shared = require('../internals/shared');
			var NATIVE_SYMBOL_REGISTRY = require('../internals/symbol-registry-detection');

			var StringToSymbolRegistry = shared('string-to-symbol-registry');
			var SymbolToStringRegistry = shared('symbol-to-string-registry');

			// `Symbol.for` method
			// https://tc39.es/ecma262/#sec-symbol.for
			$({ target: 'Symbol', stat: true, forced: !NATIVE_SYMBOL_REGISTRY }, {
			'for': function (key) {
			var string = toString(key);
			if (hasOwn(StringToSymbolRegistry, string)) return StringToSymbolRegistry[string];
			var symbol = getBuiltIn('Symbol')(string);
			StringToSymbolRegistry[string] = symbol;
			SymbolToStringRegistry[symbol] = string;
			return symbol;
			}
			});