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1. Commits on Mar 23, 2026

   • [3.13] GH-91636: Clear weakrefs created by finalizers. (GH-136401) (GH-144214)

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     sergey-miryanov

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     nascheme

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2. Commits on Dec 2, 2025

   • [3.13] gh-142048: Fix quadratically increasing GC delays (gh-142051) (#142167)

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     colesbury

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     kevmo314

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     01393ffView commit details

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3. Commits on Feb 6, 2025

   • [3.13] gh-129533: Update PyGC_Enable/Disable/IsEnabled to use atomic operat… (gh-129756)

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     corona10

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4. Commits on Nov 15, 2024

   • [3.13] gh-126312: Don't traverse frozen objects on the free-threaded build (GH-126338) (#126866)

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     ZeroIntensity

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     skirpichev

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5. Commits on Oct 24, 2024

   • [3.13] gh-125859: Fix crash when `gc.get_objects` is called during GC (GH-125882) (GH-125921)

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     miss-islington

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     colesbury

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6. Commits on Oct 15, 2024

   • [3.13] gh-124375: Avoid calling `_PyMem_ProcessDelayed` on other thread states (GH-124459) (#125540)

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     miss-islington

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     colesbury

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7. Commits on Sep 30, 2024

   • [3.13] GH-124567: Revert the Incremental GC in 3.13 (#124770)

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     Yhg1s

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     AA-Turner

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8. Commits on Jul 15, 2024

   • [3.13] gh-121794: Don't set `ob_tid` to zero in fast-path dealloc (GH-121799) (#121821)

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     miss-islington

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     colesbury

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9. Commits on Jun 4, 2024

   • [3.13] gh-117657: Fix race involving GC and heap initialization (GH-119923) (#120038)

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     miss-islington

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     colesbury

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10. Commits on Jun 3, 2024

    • [3.13] gh-117657: Fix race involving immortalizing objects (GH-119927) (#120005)

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      colesbury

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11. Commits on Jun 1, 2024

    • [3.13] gh-117657: Fix TSAN race in free-threaded GC (GH-119883) (#119903)

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      miss-islington

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      colesbury

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12. Commits on May 5, 2024

    • gh-110850: Remove _PyTime_TimeUnchecked() function (#118552)

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      vstinner

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13. Commits on Apr 29, 2024

    • gh-117657: TSAN fix race on `gstate->young.count` (#118313)

      SonicField

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    • gh-117783: Immortalize objects that use deferred reference counting (#118112)

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      colesbury

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14. Commits on Apr 12, 2024

    • gh-117376: Partial implementation of deferred reference counting (#117696)

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      colesbury

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15. Commits on Apr 8, 2024

    • gh-117439: Make refleak checking thread-safe without the GIL (#117469)

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      colesbury

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16. Commits on Apr 2, 2024

    • GH-115776: Embed the values array into the object, for "normal" Python objects. (GH-116115)

      markshannon

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17. Commits on Mar 29, 2024

    • gh-112529: Don't untrack tuples or dicts with zero refcount (#117370)

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      colesbury

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18. Commits on Mar 22, 2024

    • GH-117108: Change the size of the GC increment to about 1% of the total heap size. (GH-117120)

      markshannon

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19. Commits on Mar 20, 2024

    • GH-108362: Incremental Cycle GC (GH-116206)

      markshannon

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20. Commits on Mar 12, 2024

    • gh-116604: Check for `gcstate->enabled` in _Py_RunGC in free-threaded build (#116663)

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      colesbury

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21. Commits on Mar 8, 2024

    • gh-112075: Support freeing object memory via QSBR (#116344)

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      DinoV

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22. Commits on Mar 6, 2024

    • gh-116397: Move the _PyGC_ClearAllFreeLists to the safe point (gh-116414)

      corona10

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23. Commits on Mar 2, 2024

    • gh-115103: Update refleak checker to trigger _PyMem_ProcessDelayed (gh-116238)

      corona10

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24. Commits on Feb 28, 2024

    • gh-112529: Simplify PyObject_GC_IsTracked and PyObject_GC_IsFinalized (#114732)

      colesbury

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25. Commits on Feb 20, 2024

    • gh-110850: Use public PyTime functions (#115746)

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      vstinner

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    • gh-110850: Rename internal PyTime C API functions (#115734)

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      vstinner

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    • gh-110850: Cleanup pycore_time.h includes (#115724)

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      vstinner

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    • gh-110850: Replace _PyTime_t with PyTime_t (#115719)

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      vstinner

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    • gh-112175: Add `eval_breaker` to `PyThreadState` (#115194)

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      swtaarrs

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26. Commits on Feb 16, 2024

    • gh-112529: Make the GC scheduling thread-safe (#114880)

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      colesbury

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27. Commits on Feb 14, 2024

    • gh-111968: Rename freelist related struct names to Eric's suggestion (gh-115329)

      corona10

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28. Commits on Feb 10, 2024

    • gh-111968: Refactor _PyXXX_Fini to integrate with _PyObject_ClearFreeLists (gh-114899)

      corona10

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29. Commits on Feb 9, 2024

    • gh-110481: Implement inter-thread queue for biased reference counting (#114824)

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      colesbury

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30. Commits on Feb 7, 2024

    • GH-108362: Revert "GH-108362: Incremental GC implementation (GH-108038)" (#115132)

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      markshannon

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