in regards to supporting ORM, PHPCR ODM, MongoDB ODM etc simultaneously .. right now JMSSerializerBundle is configured to only use the ``doctrine`` service. In order to make things work with PHPCR ODM I changed the Bundle to use ``doctrine_phpcr``. Would it work if one would simply register multiple DoctrineTypeDriver instances for each doctrine registry? I do not quite understand yet how the DoctrineTypeDriver is actually registered in the serializer, since I do not see it being injected anywhere .. all it gets is the meta driver chain.