[issue46382] dataclass(slots=True) does not account for slots in base classes

[Arie Bovenberg]

Arie Bovenberg <a.c.bovenberg at gmail.com> added the comment:

There are already 2 complexities I can think of:

1. This behavior may break some people's code, if they use __slots__ to iterate over
   the fields of a dataclass. Solution: explicitly mention in the docs that
   not every field may get a slot on the new class. Advise them to use
   `fields()` to iterate over the fields.
2. It's technically allowed for __slots__ to be an iterator (which will then be 
   exhausted at class creation). Finding the __slots__ of such a class
   may require more elaborate introspection.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46382>
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