Issues

• AST Guppy emitter overwrites a live qubit local when preparing or rebinding a slot after a Permute

  bugpythonseverity:high
  PECOS-packages/PECOS#1226 · Filter by author ciaranra opened on Oct 11, 2026

• QIS path has no aggregate values, so HUGR programs returning tuples cannot complete

  enhancementrust
  PECOS-packages/PECOS#1225 · Filter by author ciaranra opened on Oct 11, 2026

• QIS path addresses qubits by operand SSA id, so integer-literal qubit arguments act on the wrong qubits

  bugrustseverity:critical
  PECOS-packages/PECOS#1224 · Filter by author ciaranra opened on Oct 11, 2026

• dem_mapping silently ignores the requested HFormula when no stabilizer group is supplied

  bugrustseverity:low
  PECOS-packages/PECOS#1222 · Filter by author ciaranra opened on Oct 11, 2026

• QIS path treats every LLVM integer width as 64 bits, so narrower arithmetic never wraps

  bugrustseverity:medium
  PECOS-packages/PECOS#1220 · Filter by author ciaranra opened on Oct 11, 2026

• Scalar dtype shifts wrap the count modulo the width and accept negative signed counts, unlike every other PECOS shift

  bugpythonseverity:medium
  PECOS-packages/PECOS#1219 · Filter by author ciaranra opened on Oct 11, 2026

• PHIR processor converts an F64 shift count without a sign check, so -1.0 shifts by zero

  bugrustseverity:low
  PECOS-packages/PECOS#1218 · Filter by author ciaranra opened on Oct 11, 2026

• QIS parser runs lshr as an arithmetic shift and unsigned icmp predicates as signed comparisons

  bugrustseverity:critical
  PECOS-packages/PECOS#1217 · Filter by author ciaranra opened on Oct 11, 2026

• DecisionConsultingStrategy documents a post-injection decision boundary that the generated T teleportation does not have

  bugrustseverity:low
  PECOS-packages/PECOS#1216 · Filter by author ciaranra opened on Oct 11, 2026

• TGateInjection frame update omits the CX conjugation for X and reads the wrong slot for the decision

  bugrustseverity:low
  PECOS-packages/PECOS#1215 · Filter by author ciaranra opened on Oct 11, 2026

• Trunk code scanning: open high-severity alerts on dev

  bugseverity:high
  PECOS-packages/PECOS#1214 · Filter by author github-actions opened on Oct 11, 2026

• The definition reader trusts the observable reference while cross-checking every other declared quantity

  enhancementpythonrust
  PECOS-packages/PECOS#1200 · Filter by author ciaranra opened on Oct 10, 2026

• pecos_uf: fast preset is fragile to native graphlike DEMs, and balanced/accurate decode worse than fast

  bugrustseverity:medium
  PECOS-packages/PECOS#1198 · Filter by author ciaranra opened on Oct 10, 2026

• Source graphlike decomposition takes ~60 s on a d=5 three-CX logical circuit (terminal: 0.2 s)

  rustseverity:medium
  PECOS-packages/PECOS#1197 · Filter by author ciaranra opened on Oct 10, 2026
  1

• Graphlike decompositions of transversal-CX DEMs lose code distance, and terminal refuses some X-basis CX circuits

  bugrustseverity:high
  PECOS-packages/PECOS#1196 · Filter by author ciaranra opened on Oct 10, 2026

• Some SLR code generators silently omit Permute or loop bodies instead of failing

  bugpythonseverity:high
  PECOS-packages/PECOS#1189 · Filter by author ciaranra opened on Oct 10, 2026
  2

• Graphlike decomposition quality depends on the DEM path: source wins on from_circuit DEMs, terminal wins on builder DEMs

  bugpythonrustseverity:medium
  PECOS-packages/PECOS#1187 · Filter by author ciaranra opened on Oct 10, 2026
  2

• Merge parallel matching edges with disagreeing observables by the most likely mechanism, not the first listed

  enhancementrustseverity:medium
  PECOS-packages/PECOS#1186 · Filter by author ciaranra opened on Oct 10, 2026

• SparseStab and Stab silently ignore forced_outcome on X- and Y-basis measurements

  bugpythonrustseverity:medium
  PECOS-packages/PECOS#1184 · Filter by author ciaranra opened on Oct 10, 2026

• A slow-marked surface-gadgets example uses undefined names, so its generated doc test cannot pass and no lane runs it

  bugpythonseverity:low
  PECOS-packages/PECOS#1172 · Filter by author ciaranra opened on Oct 10, 2026

• Two round-order check plans emit non-deterministic detectors at their default ancilla allocation

  bugpythonseverity:high
  PECOS-packages/PECOS#1152 · Filter by author ciaranra opened on Oct 10, 2026

• Expose per-measurement determinism from the stabilizer simulator so the observable reference check is exact rather than two-seed

  enhancementpython
  PECOS-packages/PECOS#1140 · Filter by author ciaranra opened on Oct 9, 2026

• Fix broken documentation links and MkDocs navigation

  PECOS-packages/PECOS#1137 · Filter by author Agnivesh-Anil-Warrier opened on Oct 9, 2026

• Finish the pecos.tools to pecos.analysis deprecation: one implementation per module

  enhancementpython
  PECOS-packages/PECOS#1118 · Filter by author ciaranra opened on Oct 9, 2026

• MPS rejects a numpy integer seed that StateVec accepts

  bugpythonseverity:low
  PECOS-packages/PECOS#1082 · Filter by author ciaranra opened on Oct 7, 2026