define-built-in.js
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define-built-in.js
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	var isCallable = require('../internals/is-callable');
	var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
	var makeBuiltIn = require('../internals/make-built-in');
	var defineGlobalProperty = require('../internals/define-global-property');

	module.exports = function (O, key, value, options) {
	if (!options) options = {};
	var simple = options.enumerable;
	var name = options.name !== undefined ? options.name : key;
	if (isCallable(value)) makeBuiltIn(value, name, options);
	if (options.global) {
	if (simple) O[key] = value;
	else defineGlobalProperty(key, value);
	} else {
	if (!options.unsafe) delete O[key];
	else if (O[key]) simple = true;
	if (simple) O[key] = value;
	else createNonEnumerableProperty(O, key, value);
	} return O;
	};