[issue42269] Add ability to set __slots__ in dataclasses

[Yurii Karabas]

Yurii Karabas <1998uriyyo at gmail.com> added the comment:

Hi Eric, I tried to help you with this feature and have opened a PR. I thought that you are too busy to implement this feature, so that's why I decided to help you (It almost two months since your last message in this thread).

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42269>
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