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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

Oh the backports failed. Well, since we're actually changing an exception message, let's not break doctests if any...

That code (and typo) is new in 3.15.

Oh. That's why! well makes sense why it failed then :) thanks for checking!

For reference, #145876.