[issue42742] Add abc.Mapping to dataclass

[Anton Abrosimov]

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

Link to python-ideas thread:
https://mail.python.org/archives/list/python-ideas@python.org/thread/XNXCUJVNOOVPAPL6LF627EOCBUUUX2DG/

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42742>
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