internal-metadata.js
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	var $ = require('../internals/export');
	var uncurryThis = require('../internals/function-uncurry-this');
	var hiddenKeys = require('../internals/hidden-keys');
	var isObject = require('../internals/is-object');
	var hasOwn = require('../internals/has-own-property');
	var defineProperty = require('../internals/object-define-property').f;
	var getOwnPropertyNamesModule = require('../internals/object-get-own-property-names');
	var getOwnPropertyNamesExternalModule = require('../internals/object-get-own-property-names-external');
	var isExtensible = require('../internals/object-is-extensible');
	var uid = require('../internals/uid');
	var FREEZING = require('../internals/freezing');

	var REQUIRED = false;
	var METADATA = uid('meta');
	var id = 0;

	var setMetadata = function (it) {
	defineProperty(it, METADATA, { value: {
	objectID: 'O' + id++, // object ID
	weakData: {} // weak collections IDs
	} });
	};

	var fastKey = function (it, create) {
	// return a primitive with prefix
	if (!isObject(it)) return typeof it == 'symbol' ? it : (typeof it == 'string' ? 'S' : 'P') + it;
	if (!hasOwn(it, METADATA)) {
	// can't set metadata to uncaught frozen object
	if (!isExtensible(it)) return 'F';
	// not necessary to add metadata
	if (!create) return 'E';
	// add missing metadata
	setMetadata(it);
	// return object ID
	} return it[METADATA].objectID;
	};

	var getWeakData = function (it, create) {
	if (!hasOwn(it, METADATA)) {
	// can't set metadata to uncaught frozen object
	if (!isExtensible(it)) return true;
	// not necessary to add metadata
	if (!create) return false;
	// add missing metadata
	setMetadata(it);
	// return the store of weak collections IDs
	} return it[METADATA].weakData;
	};

	// add metadata on freeze-family methods calling
	var onFreeze = function (it) {
	if (FREEZING && REQUIRED && isExtensible(it) && !hasOwn(it, METADATA)) setMetadata(it);
	return it;
	};

	var enable = function () {
	meta.enable = function () { /* empty */ };
	REQUIRED = true;
	var getOwnPropertyNames = getOwnPropertyNamesModule.f;
	var splice = uncurryThis([].splice);
	var test = {};
	test[METADATA] = 1;

	// prevent exposing of metadata key
	if (getOwnPropertyNames(test).length) {
	getOwnPropertyNamesModule.f = function (it) {
	var result = getOwnPropertyNames(it);
	for (var i = 0, length = result.length; i < length; i++) {
	if (result[i] === METADATA) {
	splice(result, i, 1);
	break;
	}
	} return result;
	};

	$({ target: 'Object', stat: true, forced: true }, {
	getOwnPropertyNames: getOwnPropertyNamesExternalModule.f
	});
	}
	};

	var meta = module.exports = {
	enable: enable,
	fastKey: fastKey,
	getWeakData: getWeakData,
	onFreeze: onFreeze
	};

	hiddenKeys[METADATA] = true;

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