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1. Commits on May 18, 2026

   • gh-144140: Optimize len for frozen dict/set constants in optimizer (#149969)

     lgeiger

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     18281dbView commit details

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   • gh-138325: steal list items in `INTRINSIC_LIST_TO_TUPLE` opcode (#149960)

     eendebakpt

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2. Commits on May 15, 2026

   • gh-149879: Fix sys.orig_argv[0] on Cygwin: add ".exe" suffix (#149885)

     vstinner

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     c575172View commit details

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3. Commits on May 13, 2026

   • gh-148758: Fix dynamic loading file extensions for Cygwin (#148759)

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     carlo-bramini

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     vstinner

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     50476a7View commit details

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   • gh-149685: Use the _Py prefix for private C macros (GH-149686)

     encukou

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     125f263View commit details

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   • gh-149642: Fix interaction between exec and lazy_imports=all (#149643)

     JelleZijlstra

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     4087ff8View commit details

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4. Commits on May 12, 2026

   • GH-149501: Fix compilation warning in `_YIELD_VALUE` uop (#149502)

     sergey-miryanov

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     1a79fd0View commit details

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   • gh-149595: Remove the `sys._enablelegacywindowsfsencoding()` function (#149596)

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     StanFromIreland

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     hugovk

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     6a0be13View commit details

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   • gh-139808: Add branch protections for aarch64 in asm_trampoline.S (#130864)

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     stratakis

     and

     vstinner

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     da8477bView commit details

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5. Commits on May 11, 2026

   • gh-145235: Make dict watcher API thread-safe for free-threaded builds (gh-145233)

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     yoney

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     8a48959View commit details

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6. Commits on May 8, 2026

   • gh-149459: Fix segfault when `_LOAD_SPECIAL` guard deoptimizes (#149478)

     cocolato

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     c341e34View commit details

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   • gh-100239: expose `sq_repeat` helpers for `BINARY_OP_EXTEND` (#148791)

     NekoAsakura

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     d2d24e4View commit details

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7. Commits on May 7, 2026

   • gh-149481: skip `FOR_ITER` inline specialization for Python `__next__` (#149491)

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     3 peopleauthored
     49918f5View commit details

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   • gh-148937: revert process RSS based GC deferral (#149475)

     nascheme

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     13188dbView commit details

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8. Commits on May 6, 2026

   • gh-149101: Implement PEP 788 (GH-149116)

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     3 peopleauthored
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   • gh-145559: Add PyUnstable_DumpTraceback() and PyUnstable_DumpTracebackThreads() (#148145)

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     3 peopleauthored
     646853dView commit details

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   • gh-146270: Fix `PyMember_SetOne(..., NULL)` not being atomic (gh-148800)

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     dpdani

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   • gh-148766: Add colour to Python help (#148767)

     hugovk

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     e7613f2View commit details

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   • gh-100239: specialize mixed int/float inplace binary ops (GH-149413)

     Wulian233

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     0b75b73View commit details

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9. Commits on May 5, 2026

   • GH-143732: SEND specialization (GH-148963)

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     markshannon

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   • GH-126910: Add GNU backtrace support for unwinding JIT frames (#149104)

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     diegorusso

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     pablogsal

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     1e5d942View commit details

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   • gh-149044: Implement PEP 820 – PySlot: Unified slot system for the C API (GH-149055)

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     encukou

     and

     ZeroIntensity

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     508b498View commit details

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   • gh-137293: Ignore Exceptions when searching ELF File in Remote Debug (#137309)

     uxioandrade

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     2995d45View commit details

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   • gh-98894: Restore function entry/exit DTrace probes (#142397)

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     pablogsal

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10. Commits on May 4, 2026

    • GH-148726: Add heap_size to generational GC (#149195)

      sergey-miryanov

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      e89568fView commit details

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    • gh-148690: Build Windows freethreaded binaries into separate directory and include python3t.dll on GIL-enabled (GH-149218)

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      zooba

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      encukou

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      10f950cView commit details

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    • gh-143732: add specialization for `FOR_ITER` (GH-148745)

      NekoAsakura

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      9846407View commit details

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    • gh-137030: Fix YIELD_VALUE bytecode assertion (#149184)

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      vstinner

      and

      markshannon

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      952784aView commit details

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    • gh-147998: Fix possible memory leak in _pop_preserved (crossinterp.c) (GH-147999)

      maurycy

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      72f29dcView commit details

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    • gh-148418: Fix a possible reference leak in a corrupted TYPE_CODE marshal stream (GH-148419)

      Wulian233

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      c3972f2View commit details

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    • gh-143732: allow dict subclasses to be specialized (GH-148128)

      kumaraditya303

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      5847931View commit details

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11. Commits on May 3, 2026

    • gh-149243: Check for recursion limits in `CALL_ALLOC_AND_ENTER_INIT` (#149310)

      sobolevn

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      726a17eView commit details

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    • gh-149217: Avoid adding dependencies on immutable, immortal classes in the JIT (GH149256)

      Wulian233

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      8a7eddaView commit details

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    • gh-143231: Add the module attribute to warnings.WarningMessage (GH-149298)

      serhiy-storchaka

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      00c4a94View commit details

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12. Commits on May 2, 2026

    • gh-148871: extend and improve `LOAD_COMMON_CONSTANT` (GH-148971)

      NekoAsakura

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      7c9ad27View commit details

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