[issue44123] make function parameter sentinel value true singletons

[Tal Einat]

Tal Einat <taleinat+pyt...@gmail.com> added the comment:

Alternatively, sentinels can simply be classes:

class Sentinel:
    def __new__(cls, *args, **kwargs):
        raise TypeError(f'{cls.__qualname__} cannot be instantiated')

class MISSING(Sentinel):
    pass

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<https://bugs.python.org/issue44123>
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