[issue20653] Pickle enums by name

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

This is new feature of protocol 4 (PEP 3154, section 'Serializing more "lookupable" objects'). When __reduce_ex__() returns a string (instead of a tuple), this is interpreted as the name of a global, and qualnames with dots are now supported in protocol 4.

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