- add test for dialect/impl-specific affinity comparison, #5
- add test for dialect/impl-specific affinity comparison, #5

zzzeek/alembic,ideadevice/alembic,ideadevice/alembic,ImaginationForPeople/alembic,fsys/alembic,fsys/alembic,Frozenball/alembic,6si/alembic,chishaku/alembic,graingert/alembic,moonrabbit/alembic,Frozenball/alembic,6si/alembic,sqlalchemy/alembic,moonrabbit/alembic