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1. Commits on Oct 24, 2026

   • [3.15] gh-160588: Restore the gh-123022 check in the vendored mimalloc (GH-160589) (#160611)

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     miss-islington

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     devdavidejesus

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   • gh-159244: Fix crash in dict() on a concurrently mutated key/value pair (GH-159245)

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     methane

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     christianaurichzm

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2. Commits on Oct 23, 2026

   • [3.15] gh-159294: Fix crash when creating an `ExceptionGroup` fails with `MemoryError` (GH-159295) (#160504)

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     miss-islington

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     christianaurichzm

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   • [3.15] gh-159739: Keep descriptor metadata dictionaries alive during insertion (GH-160193) (#160382)

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     miss-islington

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     jelle-openai

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3. Commits on Oct 22, 2026

   • [3.15] gh-159739: Protect list storage while reporting its size (GH-160196) (#160363)

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     miss-islington

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     jelle-openai

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   • [3.15] gh-159739: Do not intern complex subclasses in code constants (GH-159980) (#160249)

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     miss-islington

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     jelle-openai

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   • [3.15] gh-159111: Update vendored mimalloc to v2.5.2 (gh-159112) (gh-160178)

     corona10

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   • [3.15] gh-159739: Release replaced type alias values (GH-160167) (#160242)

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     miss-islington

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     jelle-openai

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   • [3.15] gh-159431: Handle immortal objects in _PyObject_XDecRefDelayed() (GH-159433) (#160229)

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     kumaraditya303

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     nascheme

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   • [3.15] gh-160179: Leave bytearray empty when __init__() fails midway (GH-160180) (#160202)

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     miss-islington

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     gpshead

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   • [3.15] gh-160162: Fix crash in int left shift with huge count on 32-bit (GH-160163) (#160169)

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     miss-islington

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     gpshead

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4. Commits on Oct 21, 2026

   • [3.15] gh-154318: Guard C recursion when hashing nested tuples and frozendicts (GH-154362) (#160128)

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     miss-islington

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     gianghungtien

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   • [3.15] gh-159739: Release weak proxy operands on errors (GH-159968) (#160018)

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     miss-islington

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     jelle-openai

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   • [3.15] gh-159739: Keep generic alias arguments alive while formatting errors (GH-159981) (#160020)

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     miss-islington

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     jelle-openai

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   • [3.15] gh-159739: Break reference cycles involving property objects (GH-159978) (#160014)

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     miss-islington

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     jelle-openai

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   • [3.15] gh-159739: Fix crash in _PyTuple_Resize() with an invalid size (GH-159804) (#159976)

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     miss-islington

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     gpshead

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   • [3.15] gh-158197: Fix split dict iteration during concurrent deletion (gh-158686) (#159953)

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     miss-islington

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     nascheme

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5. Commits on Oct 20, 2026

   • [3.15] gh-159739: Reject the minimum dynamic formatting width (GH-159780) (#159906)

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   • [3.15] gh-159739: [typing] Handle generic alias construction errors (GH-159772) (#159909)

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   • [3.15] gh-159739: Handle OrderedDict item iterator allocation failures (GH-159774) (#159915)

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   • [3.15] gh-159739: Initialize template iterator references before allocating (GH-159773) (#159900)

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   • [3.15] gh-159739: Handle module filename encoding errors (GH-159749) (#159841)

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   • [3.15] gh-159739: Check character formatting allocation failure (GH-159746) (#159839)

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     miss-islington

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     jelle-openai

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6. Commits on Oct 19, 2026

   • [3.15] gh-159739: Release tuple items if resizing fails (GH-159754) (#159787)

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7. Commits on Oct 16, 2026

   • [3.15] gh-158451: Add _PyUnicodeWriter_WriteLatin1String() test (#158464) (#159551)

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     vstinner

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   • [3.15] gh-158585: Fix _PyBytes_Resize() if hash value is already computed (#159555)

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     vstinner

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   • [3.15] gh-157710: Add MemoryError tests to PyUnicodeWriter (#159548)

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     vstinner

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   • [3.15] gh-157242: Add more PyBytesWriter tests (#159546)

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     vstinner

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   • [3.15] gh-158445: Detect invalid UCS4 characters in debug mode (#158502) (#159524)

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     vstinner

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   • [3.15] gh-159430: Add _PyObject_LookupSpecial error checks in bytes/weakref (GH-159432) (GH-159474)

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     miss-islington

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     msullivan

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8. Commits on Oct 15, 2026

   • [3.15] gh-126547: pre-allocate version number for unicode type (GH-157781) (GH-157812)

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     miss-islington

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     methane

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9. Commits on Oct 14, 2026

   • [3.15] gh-159288: Avoid segfault by adding missing recursion checks when walking lazy import chains (GH-159289) (#159416)

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     miss-islington

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     brittanyrey

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10. Commits on Oct 13, 2026

    • [3.15] gh-149816: Fix race in subtype_getweakref in free-threading build (gh-150247) (gh-159364)

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      miss-islington

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      Abhi210

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    • gh-159285: Fix crash when copying an empty dict fails with MemoryError (GH-159286)

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      miss-islington

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      christianaurichzm

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    • [3.15] gh-157242: Fix set_nomemory() on Py_TRACE_REFS build (#157351) (#159292)

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      vstinner

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