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Assume I have this code:
class Spam:
 def eggs(__some_kwarg:int=None):
 print(__some_kwarg)
I can call Spam.bar with keyword arguments as expected from mangling:
>>> Spam.eggs(10)
10
>>> Spam.eggs(_Spam__some_kwarg=10)
10
However, in the __annotations__ field, the argument name is not mangled:
>>> Spam.eggs.__annotations__
{'__some_kwarg': <class 'int'>}
This is an inconsistency which makes it difficult to work with function annotations in this case.