place _instance_key on object only when objectstore finally register_clean's on it, to make room for more aggressive "identity map" assertion when modifying objects incoming from a result set
place _instance_key on object only when objectstore finally register_clean's on it, to make
room for more aggressive "identity map" assertion when modifying objects incoming from a result set


git-svn-id: 655ff90ec95d1eeadb1ee4bb9db742a3c015d499@1052 8cd8332f-0806-0410-a4b6-96f4b9520244

obeattie/sqlalchemy,obeattie/sqlalchemy,obeattie/sqlalchemy