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

[Eric V. Smith]

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


New changeset b0f4dab8735f692bcfedcf0fa9a25e238a554bab by Eric V. Smith in branch 'master':
bpo-37868: Improve is_dataclass for instances. (GH-15325)
https://github.com/python/cpython/commit/b0f4dab8735f692bcfedcf0fa9a25e238a554bab


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