[issue20653] Pickle enums by name

[Ethan Furman]

Ethan Furman added the comment:

More explanation:

__getnewargs__ is not used by pickle protocol 0 and 1; to support those protocols we need __reduce_ex__.  Since __reduce_ex__ works for 0, 1, 2, 3, 4, ... there's no reason to have both __reduce_ex__ *and* __getnewargs__.

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<http://bugs.python.org/issue20653>
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