public function removeAttribute() {
    $args = func_get_args();
    foreach ($args as $arg) {
      // Support arrays or multiple arguments.
      if (is_array($arg)) {
        foreach ($arg as $value) {
          unset($this->storage[$value]);
        }
      }
      else {
        unset($this->storage[$arg]);
      }
    }

    return $this;
  }