[3.13] gh-82951: Fix serializing by name in pickle protocols < 4 (GH-122149)
#122264
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Serializing objects with complex qualname (such as unbound methods and
nested classes) by name no longer involves serializing parent objects by value
in pickle protocols < 4.
(cherry picked from commit dc07f65)
Co-authored-by: Serhiy Storchaka storchaka@gmail.com