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Title: Fix crash with `dataclass_transform` cache by cdce8p · Pull Request #14734 · python/mypy · GitHub

Open Graph Title: Fix crash with `dataclass_transform` cache by cdce8p · Pull Request #14734 · python/mypy

X Title: Fix crash with `dataclass_transform` cache by cdce8p · Pull Request #14734 · python/mypy

Description: Optional static typing for Python. Contribute to python/mypy development by creating an account on GitHub.

Open Graph Description: When serializing a tuple[...] field to json, it's automatically converted to [...]. Thus when reading the cache a list would get assigned to a class field specified as tuple which causes a cras...

X Description: When serializing a tuple[...] field to json, it's automatically converted to [...]. Thus when reading the cache a list would get assigned to a class field specified as tuple which causes a ...

Opengraph URL: https://github.com/python/mypy/pull/14734

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PEP 681https://peps.python.org/pep-0681
specify keyword-only arguments by defaulthttps://github.com/pydantic/pydantic/blob/main/pydantic/dataclasses.py#L108
undefined behaviorhttps://peps.python.org/pep-0681/#undefined-behavior
accepts that argument as a positionalhttps://github.com/pydantic/pydantic/blob/main/pydantic/fields.py#L238
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[dataclass_transform] detect transform spec changes in incremental mode #14695https://github.com/python/mypy/pull/14695
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