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fix: restore pickling of FrozenList in the C extension #835

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fix: restore pickling of FrozenList in the C extension #835

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08572bf
fix: restore pickling of FrozenList in the C extension (#834)
Mukller Aug 23, 2026
719ea21
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Aug 23, 2026
5388df2
fix: preserve subclass in unpickling; add subclass round-trip test
Mukller Aug 23, 2026
21540fd
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Aug 23, 2026
b956d6d
fix(tests): silence mypy on the intentional alias-dispatch pattern
Mukller Aug 23, 2026
f7fa46a
style(pyx): satisfy cython-lint blank-line rules around _unpickle_fro…
Mukller Aug 24, 2026
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7 changes: 7 additions & 0 deletions CHANGES/834.bugfix.rst
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Fixed pickling of ``FrozenList`` instances when the C extension is used -- by :user:`Mukller`.
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The free-threading change that stored the frozen flag in a C++ ``atomic[bint]``
made Cython's default reducer fail with ``TypeError: self._frozen cannot be
converted to a Python object for pickling``. An explicit ``__reduce__`` now
serializes ``(items, frozen)`` explicitly, restoring parity with the
pure-Python implementation.
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