Issues

• Trunk CI red: Rust test / linting on dev

  buggithub_actionsseverity:high
  PECOS-packages/PECOS#1377 · Filter by author github-actions opened on Oct 19, 2026
  5

• SLR converters silently drop or shift measurement records (from_quantum_circuit long-form symbols, from_stim MR/MRX/MRY/MPP/MXX)

  bugpythonseverity:critical
  PECOS-packages/PECOS#1370 · Filter by author ciaranra opened on Oct 18, 2026

• GpuStab basic-suite tests fail intermittently on macOS CI

  PECOS-packages/PECOS#1367 · Filter by author ciaranra opened on Oct 18, 2026
  1

• Integer dtype scalars truncate // and % for negative operands and panic on zero or MIN // -1

  bugpythonrustseverity:critical
  PECOS-packages/PECOS#1364 · Filter by author ciaranra opened on Oct 18, 2026

• SymbolicSparseStab::pz postselects instead of resetting an entangled qubit

  bugrustseverity:critical
  PECOS-packages/PECOS#1360 · Filter by author ciaranra opened on Oct 18, 2026

• PyPHIR raises KeyError for a cvar_define without data_type

  bugpythonseverity:low
  PECOS-packages/PECOS#1354 · Filter by author ciaranra opened on Oct 18, 2026

• Malformed cvar_export is misreported by native and silently accepted by the Python interpreter

  bugrustseverity:low
  PECOS-packages/PECOS#1353 · Filter by author ciaranra opened on Oct 18, 2026

• RustPhirClassicalInterpreter.init reports non-JSON declaration fields without naming the register

  bugpythonseverity:low
  PECOS-packages/PECOS#1352 · Filter by author ciaranra opened on Oct 18, 2026

• qvar_define with data_type null is valid upstream PHIR but rejected by PECOS

  bugrustseverity:low
  PECOS-packages/PECOS#1351 · Filter by author ciaranra opened on Oct 18, 2026

• Python PHIR interpreter's Result decode cache grows without bound between resets

  enhancementpython
  PECOS-packages/PECOS#1350 · Filter by author ciaranra opened on Oct 18, 2026

• QuantumCircuit PHIR export passes negative register widths into the program

  bugpythonseverity:low
  PECOS-packages/PECOS#1349 · Filter by author ciaranra opened on Oct 18, 2026

• PHIR classical registers with size 0 are accepted outside the schema and silently zero or sign-fill writes

  bugrustseverity:critical
  PECOS-packages/PECOS#1348 · Filter by author ciaranra opened on Oct 18, 2026

• Graphlike DEM renderers pick between equally valid splits by detector ID

  PECOS-packages/PECOS#1347 · Filter by author ciaranra opened on Oct 18, 2026

• Float dtype scalars (pc.f64, pc.f32) have no arithmetic, so PyPHIR rejects them as angles with a raw TypeError

  bugpythonseverity:medium
  PECOS-packages/PECOS#1342 · Filter by author ciaranra opened on Oct 18, 2026

• Signed PHIR register size of usize::MAX overflows the width check (debug panic, release accepts)

  bugrustseverity:low
  PECOS-packages/PECOS#1341 · Filter by author ciaranra opened on Oct 18, 2026

• HybridEngine rejects measurements into Result-created registers that native PHIR-JSON accepts

  bugpythonseverity:medium
  PECOS-packages/PECOS#1340 · Filter by author ciaranra opened on Oct 18, 2026

• test_qis_default_runtime_is_resolved_lazily fails after an editable pecos-rslib build bundles the runtime into the source tree

  PECOS-packages/PECOS#1338 · Filter by author ciaranra opened on Oct 18, 2026
  1

• Trunk CI red: Rust test / linting on dev (nightly)

  buggithub_actionsseverity:high
  PECOS-packages/PECOS#1335 · Filter by author github-actions opened on Oct 18, 2026
  2

• Smaller PHIR classical-semantics gaps between the engine and interpreters

  bugpythonrustseverity:low
  PECOS-packages/PECOS#1333 · Filter by author ciaranra opened on Oct 18, 2026

• Native PHIR-JSON engine loses negative and >32-bit ffcall return values

  bugrustseverity:critical
  PECOS-packages/PECOS#1332 · Filter by author ciaranra opened on Oct 18, 2026

• sim(PhirJson) and sim(Phir) silently ignore .quantum() and .noise()

  bugpythonrustseverity:critical
  PECOS-packages/PECOS#1331 · Filter by author ciaranra opened on Oct 18, 2026

• Native PHIR-JSON engine ignores cvar_export and returns every register

  bugpythonrustseverity:medium
  PECOS-packages/PECOS#1323 · Filter by author ciaranra opened on Oct 17, 2026

• Python bindings raise RuntimeError for caller input errors in decoders, parsers and messages

  bugpythonseverity:low
  PECOS-packages/PECOS#1319 · Filter by author ciaranra opened on Oct 17, 2026

• PauliStabilizerGroup::apply_clifford can produce non-real stabilizer phases

  bugrustseverity:medium
  PECOS-packages/PECOS#1318 · Filter by author ciaranra opened on Oct 17, 2026

• pecos-zx stabilizer feature is never built or tested in CI

  buggithub_actionsseverity:low
  PECOS-packages/PECOS#1315 · Filter by author ciaranra opened on Oct 16, 2026