mypy since 1.6.0 introduces validation error

[anselor]

Mostly to track the issue.
Issue filed with mypy repo: python/mypy#16374

[tleonhardt]

@anselor Is this still an issue?

The MyPy maintainers asked you to provide a minimal self-contained way of reproducting: python/mypy#16374

[tleonhardt]

This was fixed a long time ago. I just tested on mypy version 1.15.0 and there are no issues.