Core and builtins
+- The optional object allocator has been enabled by default.
+
- If you try to pickle an instance of a class that has __slots__ but
doesn't define or override __getstate__, a TypeError is now raised.
This is done by adding a bozo __getstate__ to the class that always
C API
+- Objects allocated using the new PyMalloc_New and PyMalloc_NewVar
+ functions will be allocated using pymalloc if it is enabled. These
+ objects should be deallocated using PyMalloc_Del. The PyObject_{New,
+ NewVar,NEW_VAR,Del,DEL} APIs have been changed to always use
+ PyMem_MALLOC and PyMem_FREE, even if pymalloc is enabled. The
+ PyCore_* family of APIs have been removed.
+
- The "u#" parser marker will now pass through Unicode object as-is
without going through the buffer API.