Core and Builtins
-----------------
+- Issue #2235: __hash__ is once again inherited by default. To allow
+ collections.Hashable to remain meaningful in the presence of the
+ default hash implementation (object.__hash__), it is now possible
+ to explicit block inheritance of hash by setting __hash__=None at
+ the Python level, or tp_hash=PyObject_HashNotImplemented at the C
+ level.
+
- Issue #3221: Issue a RuntimeWarning instead of raising SystemError if
the parent module cannot be found while performing an absolute import.
This means that an incorrectly defined __package__ attribute will