Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

Would it be worthwhile to show an example of a subclass that overrides or 
extends  __new__?   

Elsewhere in Python, the usual technique for changing method defaults is for a 
subclass to override or extend the method in question.  

    class A:
        def somemeth(self, value: bool = True):
            print(value)

    class B(A):
        def somemeth(self, value: bool = False):
            super().somemeth(value)

----------
nosy: +rhettinger

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33077>
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