find with uuid creates duplicate of document

i am pretty sure the DocumentManager::find() method creates a duplicate document each time you request the document by uuid. it should not just load the node but convert that node to a path and then do the check if the document is cached. if the node is already cached the lookup by uuid is cheap. if not, it is now cached and the lookup by path is cheap. so no overhead, but eliminate the risk of having several instances of the same document.

https://github.com/doctrine/phpcr-odm/blob/master/lib/Doctrine/ODM/PHPCR/DocumentManager.php#L279