- Added compatibility with Python 3.2 and 3.3 using the Python reference implementation.
- Add Python reference implementation. Used by default on PyPy.
4.0
================
- Added trove classifiers to project metadata.
4.0a1
==================
- Don't create wrappers when retrieving parent pointers.
2.13.2
===================
- LP 587760: Handle tp_basicsize correctly.
2.13.1
===================
- Removed undeclared testing dependency on zope.testing.
- Removed cruft in ``pickle/pickle.c`` related to removed ``__getnewargs__``.
2.13.0
===================
- Avoid defining ``__getnewargs__`` as not to defeat the ZODB persistent reference optimization. Refs https://bugs.launchpad.net/zope2/+bug/143657. In order to take advantage of this optimization, you need to re-save your objects.