There is a thread that discusses the issue:
http://aerogear-dev.1069024.n5.nabble.com/aerogear-dev-iOS-Datamanager-AGStore-td1706.html;cid=1361786565815-696

The merge was reverted, due to lack of discussions;

Right now, it may be a good idea to use just NSPredicate as the query arg, since that works fine with our current (default) impl

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