MongoEngine/mongoengine — pull request #211 by njoyce (2013-01-07 15:04:47+00:00)
Title: Ensure that the update actions are grouped rather than serial.

This is a performance update. When multiple properties of the same
entity have been deleted and modified, 2 calls to update the entity are
made, one {"$set": … } and another {"$unset": … }. This is 2 network
interface calls which is a performance killer (even at lan speeds).

Fixes: #210