[issue38878] os.PathLike subclasshook causes subclass checks true on abstract implementation

[Bar Harel]

Bar Harel <bzvi7...@gmail.com> added the comment:

A better example is this:

    class A(PathLike):
        def foo(self):
            """For all your foo needs"""

    class B:
        def __fspath__(self):
            pass

    issubclass(B, A) == True
    A().foo() # Yay, I Foo'd.
    B().foo() # oh barnacles, I should have stayed at home.

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<https://bugs.python.org/issue38878>
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