[docs] [issue32216] Document PEP 557 Data Classes (dataclasses module)

[Ned Deily]

Ned Deily <nad at python.org> added the comment:

Marking this as a "deferred blocker" for exiting the beta phase.

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nosy: +ned.deily
priority: high -> deferred blocker
stage:  -> needs patch
versions: +Python 3.8

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