Eric V. Smith <e...@trueblade.com> added the comment:

You'd need to return a different class in order to add the 
collections.abc.Mapping base class. Currently, dataclasses by design always 
return the same class that's passed in.

I'd suggest adding this as a stand-alone decorator.

----------
assignee:  -> eric.smith
nosy: +eric.smith

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42742>
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