Nick Joyce 7bb9c7d47f 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
2013-01-07 15:03:29 +00:00
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