code: public function withCollapseId(CollapseId $collapseId = null): Notification
      {
          $cloned = clone $this;
  
          $cloned->collapseId = $collapseId;
  
          return $cloned;
      }
docs: Set the collapse identifier
  
  @param CollapseId|null $collapseId
  
  @return Notification