Bug report

Bug description:

On current main (edit: debug build),

classC:def__init__(self):self.__dict__.clear()obj=C()obj.foo=None

fails with:

python: Objects/dictobject.c:6704: _PyObject_StoreInstanceAttribute: Assertion 'dict->ma_values == values' failed.

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

Notes

Originally reported here:https://discuss.python.org/t/python-3-12-3-and-3-13-0a6-released/50601/2

Linked PRs

• GH-117750: When clearing object's dict, clear inline values but leave dict attached #117808