+ - The "objects" argument to session.flush() is deprecated.
+ State which represents the linkage between a parent and
+ child object does not support "flushed" status on
+ one side of the link and not the other, so supporting
+ this operation leads to misleading results.
- Query now implements __clause_element__() which produces
its selectable, which means a Query instance can be accepted
in many SQL expressions, including col.in_(query),