Adds Appendix E (Canonical Byte-Layout Reference) — the single
byte-convention table the Binary Format companion imports — and closes
two pins (ObjectKind, ResolutionAction discriminant bytes) that were
golden-locked in code but absent from spec text. Audit follow-up:
completed the domain-tag registry (added canonical MUSCCONF/MUSCENVH and
non-canonical MUSCFNTM) and corrected golden-lock wording for the two
non-literal-byte anchors (BlobId, RationalTime).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Audit follow-up to b2f2e20. The ratification was byte-faithful, but the
audit found a gap between the protection the worklist claims ("a
golden-bytes test already locks every byte-layout item") and the
protection actually in place for several newly-normative tables, plus
three small inaccuracies in the ratified spec text.
Golden locks (close the round-trip-vs-golden gap):
- ChunkKind: chunk_kind_discriminants_are_golden pins the literal 0..=8.
ChunkKind::canonical_bytes() is in the chunk hash preimage, so the
prior round-trip-only test would let a coordinated renumbering silently
change every chunk content address while passing.
- CompressionAlgorithm: compression_algorithm_encoding_is_golden pins the
exact bytes (None -> [0,0], not a bare tag).
- ProfileId (load-bearing superblock field): profile_id_discriminants_are_golden
pins the u32 discriminants and the fixed 20-byte encoding.
- ResolutionAction / TransactionCategory / ObjectKind: *_discriminants_are_golden
pin the canonical discriminants (ObjectKind feeds the anomaly id;
ResolutionAction/TransactionCategory feed operation content hashes).
- IntegrityAnomalyId: integrity_anomaly_id_byte_form_is_locked golden-locks
the MUSCSANM-derived id (cross-replica agreement is a conformance
property; it previously had no byte-form golden).
Spec-text fixes (core_spec.tex):
- CompressionAlgorithm: "None = 0 (no payload)" was wrong; the code writes
a fixed two bytes (discriminant + always-present parameter byte). Text
now states the fixed-width framing.
- ProfileId: "a single discriminant followed by any variant payload" was
wrong; it is a u32-LE discriminant + a fixed 16-byte registry id (zero
unless Custom), 20 bytes total. Text now matches the only encoding.
- TupletRatio listing showed `pub` fields (freely constructible by struct
literal), contradicting req:time:tuplet-ratio-construction. Listing now
shows private fields + the checked `new`/`actual()`/`notated()`, matching
the code.
Test honesty:
- testkit resolution_action generator now emits Dismiss (rng.below(6)); it
previously skipped the variant, leaving the Dismiss path unfuzzed.
Verification: cargo test --workspace (433 pass, +7), clippy -D warnings
clean, fmt clean; spec rebuilds (lualatex/latexmk, 0 undefined refs, 254pp).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Spec-revision pass (architecture unchanged) converting the v0
implementation's provisional, golden-locked choices into ratified
core_spec.tex text, so durable byte layouts are fixed before the
next-phase build-outs. Worklist: spec/PASS11_WORKLIST.md; per-item
dispositions: spec/PASS11_RATIFICATION_LOG.md.
Adopt-and-pin (bytes): TypedObjectId 16-bit BE discriminant table
0..=27 (added the 5 variants the code carried); promoted-voice
(MUSCSVCE), synthetic-pitch (MUSCSPCH, tuning always in identity),
and integrity-anomaly (MUSCSANM, now a reserved built-in tag)
derivations; ChunkKind/ProfileId/CompressionAlgorithm discriminants;
ManifestId preimage (manifest_id excluded); RationalTime/scalar
layouts + the codec convention baseline the Binary Format companion
inherits.
Decide-and-pin: tempo Linear interpolates speed (not bpm);
StructuralFieldCollision tags the winner Conflicted; lifted the
>2-way / partial-overlap voice-promotion rule to normative; pinned
TransactionCategory and ObjectKind core vocabularies; added
ResolutionAction::Dismiss so the Dismissed state is reachable by an
authored op; pinned the (non-canonical) LayoutObjectId derivation
(MUSCLOID).
Fixes: blob hashing is bare MUSCBLOB||payload (deleted the
contradictory "identically to chunks" phrasing); equal-generation
superblock rule (DivergentSameGeneration); defined ProfileConstraints
with the required RetentionPolicy + first-declared precedence; made
the DVV zero-based floor normative; reconciled the invariant count to
19 and named the three construction-time MUSTs — TupletRatio now
rejects degenerate ratios at construction (zero term or
actual==notated), enforced by a checked constructor + codec decode
validation.
Code changes carry regression tests; byte-layout golden tests now
cite their ratified requirements. Workspace green: cargo test, clippy
-D warnings, fmt; spec builds (lualatex, 253pp). Per-crate DECISIONS
files annotated with the ratification status.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011giSRaHCFCGm1Z2SWv6JHt
Levi Neuwirth