- the "columns" collection on a mapper/mapped class (i.e. 'c')
is against the mapped table, not the select_table in the
case of polymorphic "union" loading (this shouldn't be
- '+', '*', '+=' and '*=' support for association proxied lists.
+ - mssql - narrowed down the test for "date"/"datetime" in MSDate/
+ MSDateTime subclasses so that incoming "datetime" objects don't
+ get mis-interpreted as "date" objects and vice versa, [ticket:923]