[issue32428] dataclasses: make it an error to have initialized non-fields in a dataclass

[Ivan Levkivskyi]

Ivan Levkivskyi <levkivskyi at gmail.com> added the comment:

A possible question here is should we give an error for any non-callable name in `__dict__` which is not in `__annotations__` or only for `Field`s?

After some thinking I am actually leaning towards the first option.

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nosy: +gvanrossum, levkivskyi

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<https://bugs.python.org/issue32428>
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