deian/hails — comment on commit 3adcf144ce66e990e602b7abe25c3efe8c3a4fb8
File: Hails/Database/MongoDB/TCB/Query.hs line 158
By deian:

It's the @select@ of mongoDB. For now, we're allowing the user to control skip, limit, etc. but later I can see it being used as:

defaultQuery { selection = [ "foo" := 0xba12 ] }