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Commits on Jan 22, 2026

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

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  stratakis

  authored
  77bf4ba

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

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  markshannon

  authored
  d77aaa7

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

  reidenong

  authored
  0b08438

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Commits on Jan 21, 2026

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

  markshannon

  authored
  9eab67d

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Commits on Jan 20, 2026

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

  corona10

  authored
  27a7160

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

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  nascheme

  authored
  48b6866

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

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  colesbury

  authored
  43bb630

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

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  nascheme

  authored
  795d5c5

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Commits on Jan 18, 2026

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

  aisk

  authored
  54bedcf

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Commits on Jan 17, 2026

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

  cocolato

  authored
  b4b7324

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

  cocolato

  authored
  61ec66a

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

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  nascheme

  authored
  bb25f72

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Commits on Jan 16, 2026

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

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  DinoV

  authored
  4d5a676

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

  ZeroIntensity

  authored
  19e64af

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

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  markshannon

  authored
  ae53da5

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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

  and

  vstinner

  authored
  f5685a2

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

  corona10

  authored
  794f758

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Commits on Jan 14, 2026

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

  mmangkad

  authored
  499706b

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

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  Fidget-Spinner

  authored
  e370c8d

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

  markshannon

  authored
  6db952e

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

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  duaneg

  authored
  ce8f5f9

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

  cocolato

  authored
  94dbce1

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Commits on Jan 13, 2026

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

  Fidget-Spinner

  authored
  2873c31

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Commits on Jan 12, 2026

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

  reidenong

  authored
  c556786

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

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  Zheaoli

  authored
  e535bdb

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

  caje731

  authored
  054a565

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Commits on Jan 11, 2026

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

  Fidget-Spinner

  authored
  548526b

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Commits on Jan 10, 2026

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

  picnixz

  authored
  ce6bae9

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

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  Zheaoli

  and

  Fidget-Spinner

  authored
  e2f0160

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Commits on Jan 9, 2026

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

  Fidget-Spinner

  authored
  9525911

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

  Fidget-Spinner

  authored
  e0fb278

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

  Fidget-Spinner

  authored
  b852236

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

  abdoulrasheed

  authored
  a4086d7

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

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  vstinner

  authored
  39a2bcf

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Commits on Jan 8, 2026

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

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  cocolato

  and

  kumaraditya303

  authored
  aeb3403

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