[issue36065] Add unified C API for accessing bytes and bytearray

[Ori Avtalion]

Ori Avtalion <ori at avtalion.name> added the comment:

My use-case is modifying existing code that supports bytes to also support bytearray.

https://github.com/mongodb/mongo-python-driver/blob/9902d239b4e557c2a657e8c8110f7751864cec95/bson/_cbsonmodule.c#L1112

The buffer protocol, which I didn't know of, feels slightly complicated for my use-case. For now I opted to adding these macros myself, only changing 3 lines.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36065>
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