Add much more detail to the "unhashable types" change
Add much more detail to the "unhashable types" change

Change-Id: I34cbf54913b81ef2ae8b2e60f03feb78601460e5
Fixes: 3958
(cherry picked from commit 10a3004f2ca29921c844f58689a5f02ed5f10e03)

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