code: function ArrayOf(...args) {
    var length = args.length;
    var constructor = this;
    // TODO: Implement IsConstructor (ES6 section 7.2.5)
    var array = %IsConstructor(constructor) ? new constructor(length) : [];
    for (var i = 0; i < length; i++) {
      %CreateDataProperty(array, i, args[i]);
    }
    array.length = length;
    return array;
  }
docs: ES6, draft 05-22-14, section 22.1.2.3