[issue42742] Add abc.Mapping to dataclass

[Anton Abrosimov]

Anton Abrosimov <abrosimov.a.a at gmail.com> added the comment:

This Mixin only works with dataclass objects. And uses the private functionality of the dataclasses. So dataclasses.py is the right place for this. I think I can do enough tests.

And I think that this is too little for a standalone project.

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<https://bugs.python.org/issue42742>
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