this seems to work, but I want to just make sure this is the intended 
behavior.

   a = dbSession.query( Something ).filter( Something.primary_key == 1 
).first()
   b = dbSession.query( Something ).get( 1 )
   c = dbSession.query( Something ).get( 1 )
   d = dbSession.query( Something ).get( 1 )
   e = dbSession.query( Something ).get( 1 )

in the above example , we will only hit the database once , because the 
'filter' populates the local session map with the primary key.  right ?

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