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1. Commits on Jun 26, 2026

   • [3.15] gh-152052: Fix misleading `json` error for `\uXXXX` escape at the end of input (GH-152053) (#152283)

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2. Commits on May 24, 2026

   • [3.15] gh-150285: Fix too long docstrings in Argument Clinic code (GH-150338) (GH-150350)

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     serhiy-storchaka

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3. Commits on Apr 12, 2026

   • gh-142831: Fix use-after-free in json encoder during re-entrant mutation (gh-142851)

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4. Commits on Apr 11, 2026

   • gh-145244: Fix use-after-free on borrowed dict key in json encoder (GH-145245)

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     raminfp

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     ZeroIntensity

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5. Commits on Apr 9, 2026

   • gh-148241: Fix json serialization for str subclasses (#148249)

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     vstinner

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6. Commits on Apr 2, 2026

   • GH-145247: Use _PyTuple_FromPair in Modules (part 1) (#148000)

     sergey-miryanov

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7. Commits on Mar 27, 2026

   • gh-146440: Add array_hook parameter to JSON decoders (#146441)

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8. Commits on Mar 24, 2026

   • gh-128341: Use _Py_ABI_SLOT in stdlib modules (#145770)

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     befeleme

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     vstinner

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9. Commits on Feb 21, 2026

   • gh-141510, PEP 814: Add frozendict support to json (#144903)

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10. Commits on Jan 12, 2026

    • gh-143196: Fix crash in non-standard use of internal JSON encoder object (GH-143618)

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      serhiy-storchaka

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    • gh-143544: Fix possible use-after-free in the JSON decoder when JSONDecodeError disappears during raising it (#143561)

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      VanshAgarwal24036

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      picnixz

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11. Commits on Oct 30, 2025

    • gh-137821: Improve Argument Clinic definitions in the ``_json`` module (#140780)

      corona10

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    • gh-137821: Convert _json module to use Argument Clinic (gh-140778)

      hnnynh

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12. Commits on Aug 31, 2025

    • gh-116738: Make `_json` module thread-safe in the free-threading (#119438)

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      eendebakpt

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      kumaraditya303

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13. Commits on Aug 7, 2025

    • gh-135336: Add fast path to json string encoding (#133239)

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14. Commits on Jul 22, 2025

    • Revert "gh-112068: C API: Add support of nullable arguments in PyArg_Parse (GH-121303)" (#136991)

      serhiy-storchaka

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15. Commits on Jun 3, 2025

    • gh-131884: Fix incorrect formatting in json.dumps() when using indent and skipkeys=True (GH-132200)

      roeibenartzi

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16. Commits on May 31, 2025

    • gh-133968: Create the Unicode writer on demand in json (#133832)

      nineteendo

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17. Commits on May 29, 2025

    • gh-133968: Add PyUnicodeWriter_WriteASCII() function (#133973)

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18. Commits on Apr 8, 2025

    • gh-112068: C API: Add support of nullable arguments in PyArg_Parse (GH-121303)

      serhiy-storchaka

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19. Commits on Mar 19, 2025

    • gh-131238: Remove more includes from pycore_interp.h (#131480)

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20. Commits on Feb 17, 2025

    • gh-111178: fix UBSan failures in `Modules/_jsonmodule.c` (GH-129781)

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      picnixz

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21. Commits on Jan 30, 2025

    • gh-128911: Add PyImport_ImportModuleAttr() function (#128912)

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      vstinner

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22. Commits on Jan 25, 2025

    • gh-129271: Fix reference leak with unicode writer in fast path in the json module (#129272)

      pablogsal

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23. Commits on Jan 24, 2025

    • gh-119182: Use public PyUnicodeWriter in _json.c (#129249)

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      vstinner

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24. Commits on Nov 12, 2024

    • gh-95382: Use cache for indentations in the JSON encoder (GH-118636)

      serhiy-storchaka

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25. Commits on Oct 10, 2024

    • gh-125196: Use PyUnicodeWriter for JSON encoder (#125249)

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      vstinner

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26. Commits on Jul 23, 2024

    • gh-122163: Add notes for JSON serialization errors (GH-122165)

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      serhiy-storchaka

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27. Commits on May 29, 2024

    • gh-119613: Use C99+ functions instead of Py_IS_NAN/INFINITY/FINITE (#119619)

      skirpichev

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28. Commits on May 6, 2024

    • gh-95382: Improve performance of json encoder with indent (GH-118105)

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29. Commits on May 3, 2024

    • gh-116322: Add Py_mod_gil module slot (#116882)

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      swtaarrs

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30. Commits on Feb 7, 2024

    • gh-112066: Use `PyDict_SetDefaultRef` in place of `PyDict_SetDefault`. (#112211)

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      colesbury

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      erlend-aasland

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31. Commits on Dec 17, 2023

    • gh-113149: Improve error message when JSON has trailing comma (GH-113227)

      carsonRadtke

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32. Commits on Nov 13, 2023

    • gh-111928: make "memo" dict local to scan_once call (gh-112005)

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      aisk

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      colesbury

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33. Commits on Aug 21, 2023

    • gh-108216: Cleanup #include in internal header files (#108228)

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      vstinner

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