Zodbpickle

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- Add support for Python 3.11 (as of 3.11.0a7).

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- Add support for Python 3.10.

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- Add support for Python 3.9.

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- CPython 2: Make ``zodbpickle.binary`` objects smaller and untracked
by the garbage collector. Now they behave more like the native bytes
object. Just like it, and just like on Python 3, they cannot have
arbitrary attributes or be weakly referenced. See `issue 53
<https://github.com/zopefoundation/zodbpickle/issues/53>`_.

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- Add support for Python 3.8.

- Drop support for Python 3.4.

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- Fix pickle corruption under certain conditions. See `pull request 47
<https://github.com/zopefoundation/zodbpickle/pull/47>`_.