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Showing content from https://mail.python.org/pipermail/python-dev/2001-September/017490.html below:

[Python-Dev] Free threading and borrowing references from mutable types

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[Guido]
> ...
> Because it returns a borrowed value, PyDict_GetItem can't safely be
> fixed to check for this and call the __getitem__ slot.

If PyDict_GetItem ended up calling a non-genuine-dict __getitem__ slot, what
would stop it from decref'ing the result in that case before returning it
(thus returning a borrowed reference even so)?  That __getitem__ may
synthesize a result object with a refcount of 1?

hard-to-approve-of-users<wink>-ly y'rs  - tim

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