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My understanding was that if a different patch will be needed, it is not the same issue. Is that not correct?
Here's the test:
 def test_iadd(self):
 ...
 self.assertRaises(TypeError, u.__iadd__, None)
It would still pass, as returning NotImplemented will still result in a TypeError, just with a friendlier message.
If any code is depending on this, it is depending on the error message text, which is explicitly not guaranteed