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1. Commits on Oct 4, 2026

   • Test MemoryError on locale encoding C functions

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   • Rework locale encoding C functions (#158680)

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   • Docs: Clarify that `ctypes.pythonapi` *may* be `None` under a statically linked interpreter (GH-158624)

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   • gh-158585: Optimize bytes object creation (#158664)

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2. Commits on Oct 3, 2026

   • gh-158583: Fix uninitialized memory read in bytes.fromhex() (#158584)

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   • gh-158585: Use PyBytesWriter in io.BufferedReader.readline() (#158615)

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   • gh-158585: Fix _PyBytes_Resize() if hash value is already computed (#158589)

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   • gh-157906: fix an incorrect architecture macro check in free-threaded GC (gh-157907)

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   • gh-158618: Split `test_free_threading` into per-module tests to avoid timeouts (#158620)

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   • gh-158239: Fix `asyncio.gather()` performance regression (#158240)

     

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   • gh-158643: Document that `Py_EnterRecursiveCall` uses the C stack, not a counter (GH-158644)

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   • gh-142349: Update lazy import comments in whatsnew (#158651)

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   • Fix _PyOS_GetOpt() error message for non-ASCII characters (#158626)

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   • gh-158445: Allocate memory in the heap in Py_GetVersion() (#158608)

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3. Commits on Oct 2, 2026

   • gh-158585: Adjust allocation in bytes_fromformat() (#158621)

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   • gh-150942: Speed up BytesIO.readlines() using reference-stealing append (#155171)

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     Taeknology

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   • gh-150816: Speed up inspect.signature() for Python functions (#157463)

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   • gh-156204: Guard recursion in `PyErr_GivenExceptionMatches` (GH-156205)

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   • gh-158140: Resolve lazily imported sibling submodules independently (#158521)

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   • gh-158563: Fix various bugs in `turtle`'s undo handling (#158564)

     StanFromIreland

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   • gh-155695: Remove resolved names from sys.lazy_modules more consistently (#157714)

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   • gh-155742: Use PyMem_Malloc() in memoryview.hex() (#158582)

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   • gh-158445: Skip invalid UCS-4 tests if Python is built with assertions (#158604)

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   • gh-158445: Add C API tests on build information functions (#158603)

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   • gh-158098: Add Setuptools workaround to abi3t migration guide (#158405)

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   • gh-157675: Add *limit* argument to encodings.idna.nameprep (GH-157682)

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   • gh-156321: Don't eagerly log exceptions from a cancelled asyncio.shield() (#158590)

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   • gh-158165: Fix _Py_get_machine_stack_pointer() compilation with MinGW (#158167)

     corona10

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   • gh-158585: Optimize PyBytesWriter_FinishWithSize() (#158586)

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4. Commits on Oct 1, 2026

   • gh-158316: Avoid second buffer fetch on bytearray_decode() (#158485)

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     johng

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   • gh-142083: Document the 'w' type code in the array.array docstring (#158040)

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   • gh-142349: Simplify lazy import resolution (#158282)

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   • gh-158567: Workaround GCC crash in PyFloat_Pack2() (#158568)

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   • Cleanup Python/getopt.c: add _PyOS_GetOpt structure (#158362)

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   • Optimize PyFloat_Pack*() functions (#158483)

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