[issue23611] Pickle nested names with protocols < 4

[STINNER Victor]

STINNER Victor added the comment:

Hum, I don't know well the pickle module. Is it backward compatible? Should Python 2 be able to unserialize data serialized by Python 3? If yes, can you patch break this compatibility?

It is unclear to me if it makes sense to even modify protocols different than the latest version.

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nosy: +haypo

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