Special Missing objects used in Zope.
Missing provides special objects used in some Zope internals like the ZCatalog.
Drop support for Python 2.7, 3.5, 3.6.
Deprecate ._Missing which containes just BBB imports.
Add support for Python 3.8, 3.9, 3.10, 3.11
Drop support for Python 3.4.
Add support for Python 3.7.
Restore Missing._Missing module for pickle compatibility with the old C extension version. [https://github.com/zopefoundation/Missing/issues/3]
Add support for bytes and matrix multiplication.
Remove the Python 2-only C extension.
Add support for Python 3.6, drop support for Python 3.3.
Add support for Python 3.4 and 3.5.
Drop support for Python 2.6 and 3.2.
Added compatibility with Python 3.2, 3.3 and PyPy using the Python implementation.
Added a Python reference implementation of the Missing class.
Changed the type name of the Missing class to Missing.Missing to distinguish it from an instance of the type like Missing.Value.
Added a __class__ to Missing.Value objects.
Released as separate package.
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