v0.5.6

API polish and test-coverage expansion

The SegmentStore trait is now sealed (feature-gated under loom; no impact on default-feature consumers), SegmentConfig gains PartialEq/Eq, FlushPolicy gains a reusable validate() method, and BufferStats/DurabilityPolicy/SegmentConfig gain human-readable Display impls. Test coverage expands with 2 loom tests, 2 property tests, 1 stress test, 1 fuzz target, and 2 criterion benchmarks.

No on-disk format change, no new dependency, no API break for default-feature consumers.

Added — API

• PartialEq + Eq for SegmentConfig (cipher compared by Arc::ptr_eq — no key material in comparisons)
• FlushPolicy::validate() — reusable validation for BatchOrIntervalMin constraints
• Sealed SegmentStore trait — prevents downstream implementations (loom feature re-exports the seal marker)
• Display impls for DurabilityPolicy, BufferStats, and SegmentConfig (cipher masked as [set]/[none])
• #[must_use] on BufferStats
• #[doc(alias = "backlog")] on pending_count()

Added — test coverage

• 2 loom tests: for_each_from Phase 2 snapshot + iter_from under concurrent append (loom suite: 12 → 14)
• 2 property tests: publish_disk_stats correctness (counters vs directory truth after sync + recover), delete_acked idempotency (overlapping ack ranges + concurrent append)
• 1 stress test: segment_size_stats under concurrent flush + delete
• 1 fuzz target: fuzz_for_each_from (7 fuzz targets total)
• 2 benchmarks: bench_segment_size_stats (100/1k/10k segments), bench_cipher (AES-256-GCM + XChaCha20-Poly1305 vs baseline)

Changed

• Internal deduplication: seq_to_index helper, BufferInner::pending_count()/latest_sequence()/pending_start() const fns, compute_store_pressure extracted from inline formula
• BufferStats Display now formats bytes in human-readable binary units (4.0KB, 1.0MB)

Full changelog

v0.5.5...v0.5.6