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Returns the bases classes for cls sorted by the MRO.
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of cls.__bases__. See https://github.com/pypa/setuptools/issues/1024.
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Workaround issue #197 - Python 3 prior to 3.2.2 uses an environment-local
encoding to save the pkg_info. Monkey-patch its write_pkg_info method to
correct this undesirable behavior.
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