- ensure identifier re-use doesn't make this break
- ensure identifier re-use doesn't make this break

Change-Id: I9fe6c42c097d31b50a479250d39a3cd8ebcbffaf

wujuguang/sqlalchemy,monetate/sqlalchemy,monetate/sqlalchemy,zzzeek/sqlalchemy,wujuguang/sqlalchemy,j5int/sqlalchemy,j5int/sqlalchemy,graingert/sqlalchemy,graingert/sqlalchemy,sqlalchemy/sqlalchemy