/**
*/
public function serialize()
{
/* Don't store Mime_Part data. Can't use clone here ATM, since there
* appears to be a PHP bug. Since this is an object specific to IMP
* (and we are only using in a certain predictable way), it should
* be ok to directly alter the MIME part object without any ill
* effects. */
$this->_part->clearContents();
$this->_isBuilt = false;
return $GLOBALS['injector']->getInstance('Horde_Pack')->pack(array($this->_composeCache, $this->id, $this->_linked, $this->_part, $this->related, $this->_uuid), array('compression' => false, 'phpob' => true));
}