v68.4.1 — Invariant Hardening & Repository Cleanup
🚀 v68.4.1 — Invariant Hardening & Repository Cleanup
Overview
v68.4.1 finalizes the v68.4 optimization cycle with a targeted hardening pass, addressing review feedback by formalizing invariant handling and cleaning up generated artifacts.
This release preserves all performance gains while improving robustness, clarity, and repository hygiene.
🧠 Invariant Hardening
Centralized Baseline Equivalence
Introduced _BASELINE_RHO = 1.0
Added helper:
_is_baseline_equivalent_rho(rho)
Replaced inline rho == 1.0 checks with helper usage
Formalized Invariant
URW(min_sum, ρ = 1.0) ≡ baseline min-sum
Algebraically guaranteed (1.0 * x = x, IEEE 754 exact)
Execution-path identical across all schedules
Verified via bitwise equality (assert_array_equal)
Impact
Ensures optimization is:
explicit
reusable
robust to future sweep/grid changes
Eliminates reliance on inline float comparisons
🧹 Repository Cleanup
Removed generated benchmark artifacts:
benchmark_v68_3_*.json
Added .gitignore rule:
benchmark_v68_*.json
Prevents repository churn from regenerated outputs
Keeps version control focused on source and test logic
⚡ Performance
Total runtime: ~40 seconds
Maintains all improvements from v68.4.0
No regressions introduced
🔒 Stability & Guarantees
Deterministic execution preserved
Float64 numerical guarantees maintained
Stable ordering unchanged
No randomness introduced
No API changes
No test modifications or weakening
✅ Validation
Tests: 3779 passed / 8 skipped
Outputs remain bitwise identical
Benchmark pipeline stable
📦 Scope
Small, surgical patch (~10–20 LOC)
Focused on invariant handling and repo hygiene
No refactors or dependency changes
🏁 Summary
v68.4.1 completes the transition from optimization to formalized, production-ready correctness, delivering a codebase that is:
fast, deterministic, invariant-aware, and clean
🔭 Forward Direction
This release establishes the foundation for:
invariant-driven optimization across additional parameter regimes
cross-test computation reuse
further runtime reduction toward ~30–35 seconds