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1. Commits on Jan 22, 2026

   • gh-142779: Initialize reserved field for proper padding (#142780)

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     stratakis

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   • GH-139109: Partial reworking of JIT data structures (GH-144105)

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     markshannon

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   • gh-130415: Narrowing to constants in branches involving `is` comparisons with a constant (GH-143895)

     reidenong

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2. Commits on Jan 21, 2026

   • GH-138245: Perform boolean guards by testing a single bit, rather than a full pointer comparison. (GH-143810)

     markshannon

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3. Commits on Jan 20, 2026

   • gh-141504: Move PYTHON_UOPS_OPTIMIZE to policy object (GH-144082)

     corona10

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   • gh-144054: no deferred refcount for untracked (gh-144081)

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     nascheme

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   • gh-143939: Fix assignment to `_PyThreadStateImpl.generator_return_kind` (gh-143951)

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     colesbury

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   • gh-144054: shutdown fix for deferred ref counting (GH-144055)

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     nascheme

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4. Commits on Jan 18, 2026

   • gh-144012: Check null binary op extend (#144014)

     aisk

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5. Commits on Jan 17, 2026

   • gh-143421: Use new buffer to save optimized uops (GH-143682)

     cocolato

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     b4b7324View commit details

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   • gh-143946: Show `JitOptSymbol` on abstract stack when set PYTHON_OPT_DEBUG > 4 (GH-143957)

     cocolato

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   • gh-132657: Add maybe_enable_deferred_ref_count() (gh-142843)

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     nascheme

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6. Commits on Jan 16, 2026

   • gh-142913: Add test case for interpreter generator w/ overridden opcodes (#142911)

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     DinoV

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   • gh-141070: Rename `PyUnstable_Object_Dump` to `PyObject_Dump` (GH-142848)

     ZeroIntensity

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   • GH-143493: Conform to spec for generator expressions while supporting virtual iterators (GH-143569)

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     markshannon

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7. Commits on Jan 15, 2026

   • gh-80620: Support negative timestamps on windows in `time.gmtime`, `time.localtime`, and `datetime` module (#143463)

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     gesslerpd

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     vstinner

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   • gh-141504: Refactor policy object into a single opt_config (gh-143644)

     corona10

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8. Commits on Jan 14, 2026

   • GH-143842: Make optimizer color table static (GH-143846)

     mmangkad

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   • gh-143123: Protect against recursive tracer calls/finalization (GH-143126)

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     Fidget-Spinner

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   • GH-143613: Add colours and some more edges to executor visualization graph (GH-143809)

     markshannon

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   • gh-106287: Do not write objects after an unmarshalling error (GH-132715)

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     duaneg

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   • gh-138050: Use cold flag instead of warm flag in `MAKE_WARM` (GH-143827)

     cocolato

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9. Commits on Jan 13, 2026

   • gh-131798: JIT optimizer: Support custom binary op and property frames (GH-143735)

     Fidget-Spinner

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10. Commits on Jan 12, 2026

    • gh-134584: Eliminate redundant refcounting in TO_BOOL_INT, TO_BOOL_LIST (GH-143759)

      reidenong

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    • gh-134584: Eliminate redundant refcounting from `_CONTAINS_{OP|OP_SET|OP_DICT}` (GH-143731)

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      Zheaoli

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    • gh-134584: JIT: Remove redundant refcount for _BINARY_OP_SUBSCR_DICT (GH-143724)

      caje731

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11. Commits on Jan 11, 2026

    • gh-134584: JIT: Remove redundant refcounting for UNARY_{INVERT|NEGATIVE} (GH-143704)

      Fidget-Spinner

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12. Commits on Jan 10, 2026

    • gh-143377: fix crashes in `_interpreters.capture_exception` (#143418)

      picnixz

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    • gh-143604: Hold strong reference to executor during JIT tracing (GH-143646)

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      Zheaoli

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      Fidget-Spinner

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13. Commits on Jan 9, 2026

    • gh-142764: Restore REPLACE_OPCODE_IF_EVALUATES_PURE optimization for some ops (GH-143335)

      Fidget-Spinner

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    • gh-143421: Allocate all JIT state in one go (GH-143626)

      Fidget-Spinner

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    • gh-143421: Lazily allocate tracer code and opt buffers (GH-143597)

      Fidget-Spinner

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    • gh-142829: Fix use-after-free in `Context.__eq__` via re-entrant `ContextVar.set` (#142905)

      abdoulrasheed

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    • gh-143547: Fix PyErr_FormatUnraisable() fallback (#143557)

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      vstinner

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14. Commits on Jan 8, 2026

    • gh-143421: Move `JitOptContext` from stack allocation to per-thread heap allocation (GH-143536)

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      cocolato

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      kumaraditya303

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      aeb3403View commit details

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