code: function ArrayToString() {
    var array;
    var func;
    if (IS_ARRAY(this)) {
      func = this.join;
      if (func === ArrayJoin) {
        return Join(this, this.length, ',', ConvertToString);
      }
      array = this;
    } else {
      array = TO_OBJECT(this);
      func = array.join;
    }
    if (!IS_CALLABLE(func)) {
      return %_Call(ObjectToString, array);
    }
    return %_Call(func, array);
  }
docs: -------------------------------------------------------------------