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1. Commits on Jun 1, 2026

   • [3.15] gh-149046: fix: correctly handle `str` subclasses in `io.StringIO` (GH-149047) (#150706)

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     miss-islington

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     KowalskiThomas

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2. Commits on May 24, 2026

   • [3.15] gh-150285: Fix too long docstrings in the io module (GH-150287) (GH-150332)

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     miss-islington

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     serhiy-storchaka

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3. Commits on Mar 23, 2026

   • gh-146175: Soft-deprecate outdated macros; convert internal usage (GH-146178)

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     encukou

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     vstinner

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4. Commits on Nov 11, 2025

   • gh-141376: Fix exported symbols (GH-141377)

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     vstinner

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5. Commits on Jun 30, 2025

   • gh-135607: remove null checking of weakref list in dealloc of extension modules and objects (#135614)

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6. Commits on Jun 12, 2025

   • Revert "gh-135410: use a critical section around `StringIO.__next__` (#135412)" (#135439)

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     ZeroIntensity

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   • gh-135410: use a critical section around `StringIO.__next__` (#135412)

     ZeroIntensity

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7. Commits on May 9, 2025

   • fix thread safety of `io.StringIO.truncate` (#133732)

     kumaraditya303

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8. Commits on Feb 8, 2025

   • gh-111178: fix UBSan failures in `Modules/_io/*.c` (GH-129083)

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     picnixz

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9. Commits on Jan 23, 2025

   • gh-119182: Use public PyUnicodeWriter in stringio.c (#129243)

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10. Commits on Jan 20, 2025

    • gh-111178: Generate correct signature for most self converters (#128447)

      erlend-aasland

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11. Commits on Nov 25, 2024

    • gh-127182: Fix `io.StringIO.__setstate__` crash when `None` is the first value (#127219)

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      sobolevn

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      vstinner

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12. Commits on Oct 9, 2024

    • gh-115754: Use Py_GetConstant(Py_CONSTANT_EMPTY_STR) (#125194)

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      vstinner

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13. Commits on Jun 21, 2024

    • gh-113993: Allow interned strings to be mortal, and fix related issues (GH-120520)

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      encukou

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      ericsnowcurrently

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14. Commits on Dec 13, 2023

    • gh-112205: Support `@setter` annotation from AC (gh-112922)

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15. Commits on Nov 30, 2023

    • gh-112205: Update stringio module to use AC for the thread-safe (gh-112549)

      corona10

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16. Commits on Nov 19, 2023

    • gh-111965: Using critical sections to make ``io.StringIO`` thread safe. (gh-112116)

      aisk

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17. Commits on Jul 25, 2023

    • gh-106869: Use new PyMemberDef constant names (#106871)

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      vstinner

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18. Commits on Jul 2, 2023

    • gh-104922: remove PY_SSIZE_T_CLEAN (#106315)

      methane

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19. Commits on Jun 1, 2023

    • gh-92536: Remove PyUnicode_READY() calls (#105210)

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20. Commits on May 15, 2023

    • gh-101819: Isolate `_io` (#101948)

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21. Commits on May 5, 2023

    • gh-101819: Prepare to modernize the _io extension (#104178)

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      vstinner

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      erlend-aasland

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22. Commits on Feb 20, 2023

    • gh-101819: Adapt _io types to heap types, batch 1 (GH-101949)

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      erlend-aasland

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23. Commits on Nov 22, 2022

    • gh-99537: Use Py_SETREF() function in C code (#99656)

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      vstinner

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24. Commits on Nov 14, 2022

    • gh-99300: Use Py_NewRef() in Modules/ directory (#99467)

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      vstinner

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25. Commits on Jul 27, 2022

    • gh-95005: Replace PyAccu with PyUnicodeWriter (gh-95006)

      aivarsk

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26. Commits on Feb 23, 2022

    • bpo-46765: Replace Locally Cached Strings with Statically Initialized Objects (gh-31366)

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      ericsnowcurrently

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27. Commits on Apr 15, 2020

    • bpo-40268: Remove unused structmember.h includes (GH-19530)

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      vstinner

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28. Commits on Mar 4, 2020

    • bpo-39573: Finish converting to new Py_IS_TYPE() macro (GH-18601)

      petdance

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29. Commits on Feb 11, 2020

    • bpo-39245: Switch to public API for Vectorcall (GH-18460)

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      encukou

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30. Commits on Sep 1, 2019

    • bpo-15999: Clean up of handling boolean arguments. (GH-15610)

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      serhiy-storchaka

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31. Commits on Aug 30, 2019

    • Fix typos mostly in comments, docs and test names (GH-15209)

      

      minho42

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      terryjreedy

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32. Commits on Jul 8, 2019

    • bpo-37337: Add _PyObject_CallMethodNoArgs() (GH-14267)

      

      jdemeyer

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      methane

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33. Commits on May 31, 2019

    • bpo-36974: tp_print -> tp_vectorcall_offset and tp_reserved -> tp_as_async (GH-13464)

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      jdemeyer

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      benjaminp

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34. Commits on Nov 21, 2018

    • bpo-35081: Add Include/internal/pycore_object.h (GH-10640)

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      vstinner

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