es.symbol.key-for.js
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es.symbol.key-for.js
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	var $ = require('../internals/export');
	var hasOwn = require('../internals/has-own-property');
	var isSymbol = require('../internals/is-symbol');
	var tryToString = require('../internals/try-to-string');
	var shared = require('../internals/shared');
	var NATIVE_SYMBOL_REGISTRY = require('../internals/symbol-registry-detection');

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

	// `Symbol.keyFor` method
	// https://tc39.es/ecma262/#sec-symbol.keyfor
	$({ target: 'Symbol', stat: true, forced: !NATIVE_SYMBOL_REGISTRY }, {
	keyFor: function keyFor(sym) {
	if (!isSymbol(sym)) throw TypeError(tryToString(sym) + ' is not a symbol');
	if (hasOwn(SymbolToStringRegistry, sym)) return SymbolToStringRegistry[sym];
	}
	});

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