[issue43176] Dataclasses derived from empty frozen bases skip immutability checks

[Eric V. Smith]

Change by Eric V. Smith <eric at trueblade.com>:


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pull_requests: +23953
pull_request: https://github.com/python/cpython/pull/25215

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43176>
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