Is this the expected behavior?
Python 3.9.0 (default, Oct 7 2020, 23:09:01)
[GCC 10.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import typing
>>> TD = typing.TypedDict("TD", {"a": str}, total=False)
>>> TD.__total__
False
>>> TD.__required_keys__
frozenset({'a'})
>>> TD.__optional_keys__
frozenset()
>>>
It seems to me "a" should not be a required key, but in fact an
optional key.
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