[issue16231] pickle persistent_id return value

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

An easy workaround (and probably the preferred method) it to return a (tag, index) tuple, like the example in http://docs.python.org/release/3.2/library/pickle.html#pickle-persistent

Testing for the None value introduces a slight incompatibility, so IMO it could only be changed for 3.4.

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nosy: +amaury.forgeotdarc

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