code: public static function isStopMessage($message, $adminCookie, &$privileged)
      {
          if ($message instanceof StopMessage) {
              $privileged = $adminCookie !== null && $message->getCookie() === $adminCookie;
  
              return true;
          } elseif ($message instanceof stdClass && isset($message->_stop_)) {
              $privileged = $adminCookie !== null && $message->_stop_ === $adminCookie;
  
              return true;
          } elseif (is_array($message) && isset($message['_stop_'])) {
              $privileged = $adminCookie !== null && $message['_stop_'] === $adminCookie;
  
              return true;
          } else {
              return false;
          }
      }
docs: @param mixed       $message
  @param string|null $adminCookie
  @param bool        $privileged
  
  @return bool