[issue37868] `is_dataclass` returns `True` if `getattr` always succeeds.

[Eric V. Smith]

Eric V. Smith <eric at trueblade.com> added the comment:

Yeah, I agree it's not an awesome design to work with classes or instances, but it's documented that way. As soon as I write some tests I'll check this in.

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<https://bugs.python.org/issue37868>
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