[3.14] gh-148914: Fix memoization of in-band PickleBuffer in the Python implementation (GH-149052)#149274
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serhiy-storchaka merged 1 commit intopython:3.14from May 2, 2026
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…n implementation (pythonGH-149052) Previously, identical PickleBuffers did not preserve identity. Also, empty writable PickleBuffer memoized an empty bytearray object in place of b'' which is a singleton in CPython, so the following references to b'' were unpickled as an empty bytearray object. (cherry picked from commit b897356) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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Previously, identical PickleBuffers did not preserve identity.
Also, empty writable PickleBuffer memoized an empty bytearray object
in place of b'' which is a singleton in CPython, so the following
references to b'' were unpickled as an empty bytearray object.
(cherry picked from commit b897356)
Co-authored-by: Serhiy Storchaka storchaka@gmail.com