13fa908e82
unpickling was *not* a reference to the singleton but rather a new instance of the ``colander._null`` class. This was unintentional, because lots of code checks for ``if x is colander.null``, which will fail across pickling and unpickling. Now the reference created when ``colander.null`` is pickled is unpickled as the singleton itself.
Colander ======== An extensible package which can be used to: - deserialize and validate a data structure composed of strings, mappings, and lists. - serialize an arbitrary data structure to a data structure composed of strings, mappings, and lists. Please see `http://docs.repoze.org/colander <http://docs.repoze.org/colander>`_ for further documentation.