Description
Describe the bug
This code now hits an assertion in dev-builds of the CPython main branch:
cython/Cython/Utility/ExtensionTypes.c
Lines 694 to 699 in 7e8a172
assert(!PyType_IsSubtype(tp, &PyType_Type));This is used in the auto-reduce setup code to fix up the reduce methods after creating the type. The assertion was added in
python/cpython#118454
Not sure if there's a way to work around this – or whether we should. It seems to be a hack on our side to update the type dict like this (even after adding the type to the module dict).
Code to reproduce the behaviour:
No response
Expected behaviour
No response
OS
No response
Python version
3.14
Cython version
master
Additional context
No response