[issue38140] Py_tp_dictoffset / Py_tp_finalize are unsettable in stable API

[Dino Viehland]

Change by Dino Viehland <dinoviehland at gmail.com>:


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nosy: +petr.viktorin

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38140>
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