[issue23401] Add pickle support of Mapping views

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

The option 3 is now available with pickle protocols >= 2 (but less efficient with protocols < 4).

Adding pickle support of Mapping views doesn't add a requirement for all classes that purport to be mappings.  But if you implement pickle support of your mapping, its views become automatically pickleable.

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versions: +Python 3.6 -Python 3.5

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