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Can you tell me in which case this exception would be raised?

@picnixz, the smallest repro for this would be

>>> class E:
...     def __getattribute__(self, n):
...         if n == "__qualname__": raise RuntimeError
...         return super().__getattribute__(n)
... 
... E()(a=1, **{"a": 2})
... 
Traceback (most recent call last):
  File "<python-input-0>", line 6, in <module>
    E()(a=1, **{"a": 2})
    ~~~^^^^^^^^^^^^^^^^^
TypeError: finction got multiple values for keyword argument 'a'

finction is a C fallback to a failing __qualname__.

Ok thanks! We could add a NEWS entry but I think it would be a too niche case. I will include this in the commit message (currently travelling)

Thanks @Anonymous941 for the PR, and @picnixz for merging it 🌮🎉.. I'm working now to backport this PR to: 3.13.
🐍🍒⛏🤖

Thanks @Anonymous941 for the PR, and @picnixz for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14.
🐍🍒⛏🤖

Sorry, @Anonymous941 and @picnixz, I could not cleanly backport this to 3.13 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker 54a8921140ba98461ca915fb80a043271c275b51 3.13

Sorry, @Anonymous941 and @picnixz, I could not cleanly backport this to 3.14 due to a conflict.
Please backport using cherry_picker on command line.

cherry_picker 54a8921140ba98461ca915fb80a043271c275b51 3.14