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v4 T-4.6: yaml.dag — YamlValue model + Outcome<YamlValue> parse/emit seam - #3188

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What this is

Fan-out format 2 of 6 for T-4.6 (canonical-first: seam ratified on json.dag #3184, T-4 mgr seam-review msg_f5971a8a). This exact-mirrors the ratified json.dag shape for YAML. Single-file PR, fresh branch off current main (not stacked — the #3179 contamination lesson). Immutable scaffold header (lines 1–20) untouched.

Modeled (declaration-class, substrate-faithful)

  • YamlValue = YamlNull | YamlBool | YamlInt | YamlFloat | YamlString | YamlSequence | YamlMapping — closed recursive YAML 1.2.2 §10.2 core-schema value sum; recursion via List/Map children with the recursive occurrence a name-reference YamlValue (node.dag A1, the std/nat.dag Nat shape; YamlMapping recurses in both key and value per the immutable header's Map<YamlValue, YamlValue>); full Practice-4 five-pattern ledger, 🟢 terminal.
  • Kernel-ambient carriers only (Bool/String/List/Map); zero std/ imports.

Mirrors the ratified json.dag seam exactly

  • Carrier seam = Outcome<YamlValue> (the one operator-ratified D1 carrier, std/diagnostic.dag DECISIONS item I — not a per-file sum).
  • YamlInt/YamlFloat { lexeme: String } lexeme-preserving (YAML 1.2.2 §10.2.2 tag resolution decides the variant; numeric interpretation deferred-with-trigger to std/integer.dag + std/float.dag — collapsing now = fabrication while those are scaffold + breaks B-6 round-trip).
  • parse/emit bodies deferred 🟡 named-owner std/text.dag (Char-walk) — incl. YAML anchor/alias + §10.2 tag resolution as parse-time phases; the produced YamlValue is alias-free by construction, an unresolvable/cyclic alias is a fail-closed Rejected (no-engine honesty; the json.dag dup-key discipline applied to YAML). Not bodiless fns (v2 rejects), not improvised.
  • ZERO authored algebra inhabitance (D2 still deferred — YAML values are heterogeneous data, not an algebra carrier).
  • // Anchor: convention with per-carrier YAML 1.2.2 §/URL citations.

Verification

Canonical gate (v2-compiler compile --source-root src/v4 --target dag) against this branch (main a4d6a9f60 + yaml.dag): indexed 64 modules ... compiled: 1 files emitted, **0 diagnostics**, exit 0; confirmed run against the modified file (REMOTE_HAS_YAMLVALUE=1, 254 lines).

Operator merges manually (no self-merge). Independent single-file PR — a finding here does not block the other formats.

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Review metadata

  • Provider / model: codex / unknown
  • Commit: 9e5d58b0 · Trigger: schedule
  • Thinking: 257s wall

BLOCKING (1)

Root Cause

  • src/v4/extdeps/formats/yaml.dag YamlInt/YamlFloat preserve source lexeme but drop the canonical-form fact required for YAML node equality → carry a canonical equality key alongside the emission lexeme or key mappings by a canonical YamlKey.

⚠️ One substrate-level YAML equality fact is missing, so the mapping model can accept inputs the spec says are duplicate-key errors.

| YamlFloat { lexeme: String }
| YamlString { value: String }
| YamlSequence { elements: List<YamlValue> }
| YamlMapping { entries: Map<YamlValue, YamlValue> }

This comment was marked as resolved.

….2.1.3 canonical-key dedup is a deferred-parser invariant, not structural (BLOCKING #3188)
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Re: BLOCKING @ src/v4/extdeps/formats/yaml.dag:197 — "YamlMapping keys keyed by lexeme-only YamlValue; YAML 1.2.2 §3.2.1.3 defines uniqueness by tag + canonical content, so Map<YamlValue,YamlValue> does not make duplicate keys unrepresentable (P1/P2)".

Valid — confirmed and fixed (commit b9bb6918, doc-only, re-verified 0-diag, HEAD-honest). You are right: §3.2.1.3 defines key equality by tag + canonical content, and because YamlInt/YamlFloat carry the verbatim lexeme (the deliberate lexeme-preserving decision — numeric/tag canonicalization rides the deferred integer/float substrate), Map<YamlValue,YamlValue> only forecloses lexeme-IDENTICAL duplicates. Canonically-equal-but-lexeme-distinct keys (0x10/16 !!int; 1.0/1.0e0 !!float) remained representable — so my earlier "Map makes duplicate keys structurally unrepresentable" claim over-promised what the carrier provides. That was the inverse-of-P2 over-claim error.

Fix (the std/collection.dag #3169 over-claim-correction precedent — tighten the framing to match the carrier; defer the rest honestly, do not silently rewrite the model):

  • The YamlMapping bullet now states the honest scope: Map dedup is lexeme-sensitive only; §3.2.1.3 (tag + canonical) is NOT a structural carrier guarantee here.
  • New 🟡 tracked-scaffold (3): full §3.2.1.3 key uniqueness is a deferred-parser fail-closed invariant (the parser resolves each key's tag, canonicalizes, rejects canonically-equal duplicates as Rejected — same fail-closed parse-construction discipline as alias-cycle/tag-resolution; no silent last-wins = no-engine), with bounds + a dissolution trigger (rides the tag-resolution + numeric canonicalization substrate; structural key-canonicalization then becomes carrier-enforced).

Carrier stays Map<YamlValue,YamlValue> per the immutable scaffold header (key canonicalization genuinely needs the deferred numeric/tag substrate — cannot be done structurally now without it). Scope note: this is YAML-specific (non-string keys + lexeme-preserved scalars). json.dag (Map<String,JsonValue>) and toml.dag (Map<String,TomlValue>) have string keys, so their Map-dedup IS the spec's key equality — their analogous claims are sound; this is not a canonical-seam defect.

— sent from keen-wren-419

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Re: codex BLOCKING (sha 9e5d58b0, schedule) — "YamlInt/YamlFloat drop the canonical-form fact required for YAML node equality → carry a canonical equality key, or key mappings by a canonical YamlKey".

This reviewed the pre-fix sha 9e5d58b0; current HEAD is b9bb6918. The underlying concern is valid and already addressed — it is the same §3.2.1.3 issue as the inline BLOCKING above, which I confirmed and fixed:

  • b9bb6918 (doc-only, 0-diag, HEAD-honest) removes the over-claim and makes YAML 1.2.2 §3.2.1.3 canonical-key uniqueness an explicit deferred-parser fail-closed invariant (🟡 tracked-scaffold (3): parser resolves each key's tag, canonicalizes, rejects canonically-equal duplicates as Rejected; no silent last-wins) + a dissolution trigger. The "missing equality fact" is surfaced honestly, not concealed — exactly the std/collection.dag v4 T-3 Wave-A1: std/collection.dag — List + Set (b2 plain carriers; Map split to Wave-A2) #3169 over-claim-correction precedent (tighten framing to the carrier; defer the rest with a named trigger).

On codex's specific prescribed remediations — neither is a now-fix; both ARE the dissolution trigger:

  • "carry a canonical equality key alongside the lexeme" / "key by a canonical YamlKey" → a canonical numeric/tag form requires the numeric+tag canonicalization substrate (std/integer.dag / std/float.dag interpretation + §10.2 tag resolution), which is deferred scaffold. Computing/storing it now would fabricate the very numeric interpretation the ratified lexeme-preserving seam decision deliberately defers (no-fabrication; mirrors json.dag JsonNumber — operator-ratified seam v4 T-4.6: canonical json.dag — JsonValue model + Outcome<JsonValue> parse/emit seam #3184) and a canonical YamlKey type would also deviate from the immutable scaffold header (Map<YamlValue, YamlValue>) = operator-tier, not worker authority.
  • So the canonical-key remediation is precisely the dissolution trigger of 🟡 (3) — it lands when the canonicalization substrate lands, at which point §3.2.1.3 uniqueness becomes carrier-enforced. Until then the fail-closed parser is the §3.2.1.3 authority (the same deferred parse-construction discipline as alias-cycle/tag-resolution; the ratified seam).

Net: valid concern, already addressed in the only honest way available pre-substrate (acknowledged + deferred-with-trigger, not improvised, not concealed). No new commit — b9bb6918 is the fix; the structural canonical-key form is substrate-gated future work, not a now-fix.

— sent from keen-wren-419

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Review metadata

  • Provider / model: openai-pro / gpt-5-5-pro
  • Commit: b9bb6918 · Trigger: manual
  • Comparison: main @ a4d6a9f6 ... t4.6/yaml @ b9bb6918
  • Conversation: View conversation

1. Story of the diff

This PR turns src/v4/extdeps/formats/yaml.dag from an empty format stub into a declarative YAML value model. The load-bearing addition is type YamlValue, a closed recursive sum over null, bool, int lexeme, float lexeme, string, sequence, and mapping at src/v4/extdeps/formats/yaml.dag:219-226. The PR deliberately does not author parse/emit functions yet; instead it records the future parse seam as Outcome<YamlValue> and documents the deferred parser obligations for alias resolution, tag resolution, numeric interpretation, and YAML mapping-key canonical uniqueness. That is the right shape for a “model now, operations later” substrate PR: the value carrier lands as data, while effectful/algorithmic surfaces are bounded as tracked scaffolds rather than improvised bodies.

2. Invariant categories

1. LAYER MODEL (substrate vs implementation)

Finding — BLOCKING, Modeling Faithfulness / substrate external authority.

The diff touches substrate-facing .dag data, not implementation-only Rust: src/v4/extdeps/formats/yaml.dag:219-226 adds the new YamlValue type. Because this file is the modeling authority for YAML, its external spec anchor needs to be exact. The diff currently says:

src/v4/extdeps/formats/yaml.dag:88-89

// seven YAML core-schema value kinds. Anchor: YAML 1.2.2 §10.2 (core// schema) — https://yaml.org/spec/1.2.2/#102-core-schema — over the

That is the wrong section: YAML 1.2.2 §10.2 is the JSON schema, while §10.3 is the Core schema; the core-specific forms this file later relies on, such as octal/hex integers and .inf/.nan, are in §10.3.2, not §10.2.2. YAML This matters because the deferred parser notes also point future parser work at §10.2.2 tag resolution in src/v4/extdeps/formats/yaml.dag:270; following that anchor would implement JSON-schema resolution and contradict the core-schema examples and semantics elsewhere in the same model.

2. INVARIANTS.md + modeling-discipline.md

Finding — BLOCKING, P1 Modeling Faithfulness.

INVARIANTS P1 requires a construct to ground in the declared external fact, not a near miss. The wrong anchor above is not just a typo in prose because this PR is explicitly making the comments the authority for the deferred parser seam. The file says the YAML value space is anchored in “YAML 1.2.2 §10.2 (core schema)” at src/v4/extdeps/formats/yaml.dag:88-89, then later uses core-schema-only examples for canonical key uniqueness at src/v4/extdeps/formats/yaml.dag:291:

//   scalar keys (e.g. `0x10`/`16` `!!int`; `1.0`/`1.0e0` `!!float`;

The official YAML 1.2.2 text places JSON tag resolution at §10.2.2 and Core tag resolution at §10.3.2; the core section is where 0x, 0o, .inf, and .nan are recognized. YAML Fixing the section/link references to §10.3 / §10.3.2 would restore the intended grounding.

Other modeling decisions look sound: the YamlValue sum has a Practice-4 terminal ledger at src/v4/extdeps/formats/yaml.dag:180-218, and the mapping-key uniqueness overclaim from the first commit appears corrected by explicitly saying full §3.2.1.3 duplicate detection is deferred-parser authority rather than a Map carrier guarantee at src/v4/extdeps/formats/yaml.dag:141-149.

3. CODING.md

Compliant.

The diff stays in data/declaration space and does not introduce Rust methods, hidden state, builder APIs, panics, or primitive sentinel return values. The future error seam is explicitly structured as Outcome<YamlValue> rather than a local per-file result sum at src/v4/extdeps/formats/yaml.dag:46-53; that aligns with the “data + functions” and structured carrier direction.

4. TESTING.md

N/A — declaration-only substrate addition; no executable parse/emit behavior lands here.

The PR does not add parser or emitter bodies, and it explicitly says yaml_parse / yaml_emit are absent today at src/v4/extdeps/formats/yaml.dag:251-252. Once the deferred parser lands, the YAML-specific fail-closed cases documented here — unresolved alias, alias cycle, tag resolution, numeric interpretation, and canonical duplicate keys — should become behavior-level .dag TestClaim coverage.

5. LOCKED DESIGN DECISIONS

N/A — no locked design doc or locked architectural surface is modified.

The diff references existing ratified patterns and mirrors the canonical JSON seam, but it does not alter a locked design decision. The one issue above is an external YAML-spec anchor mismatch, not a divergence from a locked gunbc design.

6. TRACKED vs UNTRACKED DEBT

Compliant.

The deferred work is tracked rather than free-floating. The scaffold section names the three required bridge properties at src/v4/extdeps/formats/yaml.dag:230-236, then provides documentation, bounds, and dissolution triggers for parse/emit at src/v4/extdeps/formats/yaml.dag:251-267, numeric interpretation at src/v4/extdeps/formats/yaml.dag:274-282, and canonical mapping-key uniqueness at src/v4/extdeps/formats/yaml.dag:297-314. The mapping-key note is especially important: src/v4/extdeps/formats/yaml.dag:300-304 explicitly forbids consumers from assuming YamlMapping is §3.2.1.3-dup-free from the type alone.

2.5. Top-down PM intent review

Compliant.

At PM-intent level, this PR preserves the v4 direction: model the data authority in .dag, keep operations out until the required text/numeric substrate exists, and avoid new hand-written implementation. The YamlValue declaration lands as one data-authored substrate fact at src/v4/extdeps/formats/yaml.dag:219-226; the parse/emit operations are not converted into permanent scaffolding because their absence is bounded and tied to concrete dissolution triggers at src/v4/extdeps/formats/yaml.dag:251-267. The blocking issue above is a spec-grounding correction needed before merge, not evidence that the PR is semantically diluting the broader plan.

3. Verdict

REQUEST_CHANGES

The shape is otherwise disciplined: closed value carrier, Outcome<YamlValue> seam, no parser fabrication, and tracked debt for deferred operations. I would block only on correcting the YAML Core Schema references from §10.2/§10.2.2 to §10.3/§10.3.2, because this is a substrate authority file and the wrong external anchor can steer the deferred parser to the wrong tag-resolution semantics.

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Tracking note (T-4 mgr-confirmed (b)+tracked, msg_8e94dd97): the finding-2 JsonNumber/*Int/*Float deferral was split on canonical json.dag #3184 into an explicit 3-way trigger (token-validity→deferred-parser / numeric-value→float+integer.dag / refined-§6-lexeme-type→unlanded String-refinement substrate). yaml.dag's substance is identical (same deferred owners); only the prose is less granular. Per the seam-gate decision this 3-way-trigger prose split converges onto #3188 on its NEXT re-roll for any reason (zero marginal cost) — substance already identical; canonical #3184 is the authority. Tracked-not-silent, not a model divergence. — sent from keen-wren-419

…chema) → §10.3/§10.3.2 (Core Schema); core forms (0x/0o int, .inf/.nan) are §10.3.2 (REQUEST_CHANGES #3188 openai-pro P1)
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Re: REQUEST_CHANGES (openai-pro/gpt-5-5-pro) — YAML Core Schema anchor mismatch: file cites §10.2/§10.2.2 ("core schema") but §10.2 is the JSON Schema; the Core Schema is §10.3/§10.3.2, where the core forms this model relies on (0x/0o ints, .inf/.nan floats) are defined.

Valid — fixed (commit a86e674c, doc-only, re-verified 0-diag, HEAD-honest). Confirmed against YAML 1.2.2: §10.2 = JSON Schema / §10.2.2 = JSON tag resolution; §10.3 = Core Schema / §10.3.2 = Core tag resolution (octal/hex int, .inf/.nan recognized in §10.3.2). My citations were self-contradictory (labeled "core-schema" while pointing at the JSON-schema section/URL) — a real INVARIANTS P1 grounding error, exactly as you flagged, and load-bearing since these comments steer the deferred parser's tag-resolution target.

Fix applied throughout yaml.dag:

  • §10.2 → §10.3 (Core Schema) — anchor line, value-space prose, ledger.
  • §10.2.2 → §10.3.2 (Core tag resolution) — the per-scalar …:null/bool/int/float/str bullets.
  • https://yaml.org/spec/1.2.2/#102-core-schema → #103-core-schema.
  • The deferred-parser tag-resolution references (compose→resolve→§10.3.2 tag resolution; the canonical-key-uniqueness dissolution trigger) now point at §10.3.2 Core tag resolution, so future parser work implements Core (not JSON) schema resolution — consistent with the 0x10/.inf/.nan core-schema examples used in the §3.2.1.3 honest-scope note.

Verified zero residual §10.2/#102. Scope: this is yaml.dag-specific — json.dag (RFC 8259) and toml.dag (TOML v1.0.0) cite no YAML §10.x sections, so no mirror propagation. Everything else in your review was Compliant/N/A; this was the sole blocking item and it is corrected.

— sent from keen-wren-419

…: YamlValue -> Outcome<String> (fail-closed both directions); immutable-header reconcile tracked-not-silent (mgr seam-gate active-propagation msg_c7704bd6)
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Ratified-seam-#3 active-propagation (T-4 mgr seam-gate msg_c7704bd6): the canonical json.dag #3184 emit seam was corrected to fail-closed BOTH directions (*_emit : *Value -> Outcome<String>, not total -> String) — a P3/no-fabrication correctness fix (type-constructible spec-invalid value can't fabricate an invalid artifact on emit). Per the seam-gate this is a CORRECTNESS refinement (actively propagated, not finding-2-style tracked-opportunistic). Applied to yaml.dag here: commit e93accbb3, doc-only, re-verified 0-diag (64 modules), HEAD-honest. yaml_emit : YamlValue -> Outcome<String> fail-closed; dissolution trigger tightened so a total -> String emit cannot satisfy it. The immutable-header line emit(YamlValue) -> String edit is operator-tier (csv-class authority) — flagged by the T-4 mgr into the batched operator header-reconcile; the header/note divergence is tracked-not-silent in-file meanwhile. — sent from keen-wren-419

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Review metadata

  • Provider / model: codex / unknown
  • Commit: e93accbb · Trigger: schedule
  • Thinking: 263s wall

BLOCKING (1)

Root Cause

  • src/v4/extdeps/formats/yaml.dag Corrected emit seam was propagated in the detailed scaffold but not in the opening carrier summary → make the summary name Outcome generically or list parse as Outcome and emit as Outcome.

Non-blocking — Improvements (fix in-PR if easy, else defer to roadmap)

  • src/v4/extdeps/formats/yaml.dag Line 329 groups tag-distinct same-content with duplicate-key examples even though YAML §3.2.1.3 requires matching tags for equality (https://yaml.org/spec/1.2.2/#3213-node-comparison); reword it as an allowed distinct-key case, deferred under T-4.6 if needed.

⚠️ One seam-authority contradiction should be fixed before landing.

Comment thread src/v4/extdeps/formats/yaml.dag Outdated
// canonical src/v4/extdeps/formats/json.dag seam (PR #3184, T-4 mgr
// seam-review ratification msg_f5971a8a): the format's closed recursive
// value sum + node.dag A1 name-reference recursion + the Practice-4
// five-pattern ledger; the parse/emit carrier seam = `Outcome<YamlValue>`

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Re: BLOCKING @ src/v4/extdeps/formats/yaml.dag:226 (| YamlMapping { entries: Map<YamlValue, YamlValue> }) — "keyed by lexeme-only YamlValue; YAML 1.2.2 §3.2.1.3 defines uniqueness by tag + canonical content, so Map<YamlValue,YamlValue> does not make duplicate keys unrepresentable (P1/P2)".

Valid — and already addressed at current HEAD e93accbb3 (the fix landed in commit b9bb6918; intact, verified). This is the same §3.2.1.3 over-claim you flagged earlier; it was corrected (not rebutted) via the std/collection.dag #3169 over-claim-correction discipline:

  • YamlMapping bullet, "KEY-UNIQUENESS — HONEST SCOPE (do NOT over-claim)" (yaml.dag:127+): explicitly states Map<YamlValue,YamlValue> dedups by YamlValue STRUCTURAL (lexeme-sensitive) equality only; YAML 1.2.2 §3.2.1.3 keys by TAG + CANONICAL content; canonically-equal-but-lexeme-distinct keys (0x10/16 !!int; 1.0/1.0e0 !!float) are §3.2.1.3 duplicates yet distinct YamlValues here — so Map does NOT make §3.2.1.3-duplicate keys structurally unrepresentable; it only forecloses lexeme-IDENTICAL duplicates. The over-claim is removed; nothing claims structural §3.2.1.3 uniqueness.
  • 🟡 tracked-scaffold (3) (yaml.dag:321+): full §3.2.1.3 key uniqueness is a deferred-parser fail-closed invariant (parser resolves each key's tag, canonicalizes, rejects canonically-equal duplicates as Rejected; no silent last-wins) with bounds + a named dissolution trigger (tag-resolution + numeric/scalar canonicalization substrate).

No fix applicable now: the carrier is Map<YamlValue, YamlValue> per the immutable scaffold header (key AND value YamlValue); making §3.2.1.3 structurally unrepresentable requires canonicalizing keys, which needs the unlanded numeric/tag-canonicalization substrate and would alter the ratified lexeme-preserving seam #2 — so it is the deferred (3) dissolution trigger, not a now-fix. P1/P2 are satisfied honestly: the limit is surfaced, not over-claimed (the collection.dag #3169 precedent, manager-affirmed).

— sent from keen-wren-419

…orrected seam #3 (parse->Outcome<YamlValue>, emit->Outcome<String>); remove the stale two-authorities emit-carrier divergence (BLOCKING #3188 P2/P3)
briansrls added a commit that referenced this pull request May 16, 2026
…orrected seam #3 (parse->Outcome<JsonValue>, emit->Outcome<String>); remove stale two-authorities emit-carrier divergence (seam-wide consistency, #3188 P2 caught it)
briansrls added a commit that referenced this pull request May 16, 2026
…orrected seam #3 (parse->Outcome<TomlValue>, emit->Outcome<String>); remove stale two-authorities emit-carrier divergence (seam-wide consistency, #3188 P2 caught it)
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Re: BLOCKING @ src/v4/extdeps/formats/yaml.dag:32 — "opening summary says the parse/emit carrier seam is Outcome, but later lines require yaml_emit : YamlValue -> Outcome — two authorities for the emit failure carrier (P2/P3)".

Valid — fixed (commit 7e8606252, doc-only, re-verified 0-diag, HEAD-honest). Correct catch: the ratified-corrected-seam-#3 emit-fix (yaml_emit -> Outcome<String>, e93accb) updated the Deferred (1) block but I left the top CARRIER SEAM summary (lines ~32 and ~46) saying the pre-fix Outcome<YamlValue> for parse/emit — a genuine two-authorities divergence I introduced. Reconciled: both the line-32 summary and the CARRIER SEAM modeling-note block now state the single ratified seam #3 — yaml_parse : String -> Outcome<YamlValue> AND yaml_emit : YamlValue -> Outcome<String> (fail-closed both directions), explicitly marked "single authority = the Deferred (1) block; this is the summary, not a second authority — no divergence." The immutable-header emit -> String line is noted as the operator-tier batched header-reconcile (tracked-not-silent), consistent with the Deferred block.

Seam-wide consistency completed (the incomplete propagation existed on all three — the emit-fix touched only the deferred blocks): the same top-summary reconciliation is applied to the canonical json.dag #3184 (b23dd6935) and toml.dag #3189 (72d80efaf), each 0-diag + HEAD-honest. Single emit-carrier authority across the whole fan-out; no top/deferred divergence remains.

— sent from keen-wren-419

… an ALLOWED distinct key (§3.2.1.3 needs matching tags), not a duplicate example; only same-tag canon-equal is the deferred gap (codex non-blocking #3188)
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Re: codex (sha e93accbb, schedule) — BLOCKING + one non-blocking improvement.

BLOCKING ("corrected emit seam propagated in the scaffold but not the opening carrier summary") — ALREADY ADDRESSED. codex reviewed pre-fix sha e93accbb; current HEAD reconciled the top summary in commit 7e8606252: the line-32 summary and the CARRIER SEAM block now state exactly codex's prescription — yaml_parse : String -> Outcome<YamlValue> AND yaml_emit : YamlValue -> Outcome<String>, explicitly "single authority = the Deferred (1) block; this is the summary, not a second authority — no divergence." (Same reconciliation applied seam-wide: json #3184 b23dd6935, toml #3189 72d80efaf.)

Non-blocking improvement (§3.2.1.3 example precision) — VALID, fixed in-PR (commit <see below>, doc-only, 0-diag, HEAD-honest). Correct: YAML 1.2.2 §3.2.1.3 node equality requires MATCHING tags AND equal canonical content, so a tag-DISTINCT same-content pair (!!str "1" vs !!int 1) is NOT a §3.2.1.3 duplicate — it is an ALLOWED distinct key. My 🟡(3) note wrongly grouped "tag-distinct same-content" with the duplicate examples. Reworded: the deferred §3.2.1.3 gap is same-tag canonically-equal-but-lexeme-distinct only (0x10/16 both !!int; 1.0/1.0e0 both !!float); tag-distinct same-content is explicitly called out as an allowed distinct key the carrier correctly keeps distinct.

— sent from keen-wren-419

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Review metadata

  • Provider / model: codex / unknown
  • Commit: 7acc2253 · Trigger: schedule
  • Thinking: 156s wall

Non-blocking — Strengths

✅ No blocking concerns in the changed lines.

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  • Provider / model: openai-pro / gpt-5-5-pro
  • Commit: 7acc2253 · Trigger: manual
  • Comparison: main @ a4d6a9f6 ... t4.6/yaml @ 7acc2253
  • Conversation: View conversation

1. Story of the diff

This PR turns src/v4/extdeps/formats/yaml.dag from a skeleton into a declarative YAML value authority. It adds a closed recursive YamlValue sum with YAML core-schema scalar variants, sequences, and mappings at src/v4/extdeps/formats/yaml.dag:234-241, while deliberately preserving integer/float lexemes instead of collapsing them into premature numeric carriers at src/v4/extdeps/formats/yaml.dag:112-127. The PR does not implement parsing or emitting; instead, it records the ratified fail-closed seam for both directions, yaml_parse : String -> Outcome<YamlValue> and yaml_emit : YamlValue -> Outcome<String>, and defers the operation bodies until the text/numeric substrate is ready at src/v4/extdeps/formats/yaml.dag:51-68 and src/v4/extdeps/formats/yaml.dag:253-319.

The load-bearing design choice is that YAML-specific hard parts are modeled honestly rather than hidden inside the carrier. Anchors/aliases are parse-time structure sharing, so produced values are alias-free and finite at src/v4/extdeps/formats/yaml.dag:75-85; tag resolution produces the scalar variant rather than storing raw nodes at src/v4/extdeps/formats/yaml.dag:86-89; and canonical mapping-key uniqueness is explicitly not over-claimed as a Map<YamlValue, YamlValue> structural guarantee, because YAML key equality is tag + canonical content, not surface lexeme equality at src/v4/extdeps/formats/yaml.dag:142-175 and src/v4/extdeps/formats/yaml.dag:336-372. I cross-checked that last point against YAML 1.2.2: the spec’s node-comparison section requires same tag and canonical-form/content equality for scalar equality and key uniqueness, matching the PR’s deferred-parser treatment. YAML

2. Invariant categories

  1. LAYER MODEL (substrate vs implementation). Compliant — this is .dag modeling, not Rust implementation: the new cross-consumer authority is the YamlValue declaration at src/v4/extdeps/formats/yaml.dag:234-241, and the implementation seam is intentionally deferred instead of landing a parallel parser/emitter body at src/v4/extdeps/formats/yaml.dag:244-251.
  2. INVARIANTS.md + modeling-discipline.md. Compliant — fail-closed/no-fabrication is handled by making both parse and emit return Outcome rather than fabricating partial/default artifacts at src/v4/extdeps/formats/yaml.dag:51-68 and src/v4/extdeps/formats/yaml.dag:277-291; illegal mixed states are kept unrepresentable by the sum shape at src/v4/extdeps/formats/yaml.dag:203-210; and coproduct dissolution is explicitly ledgered through all five Practice-4 patterns at src/v4/extdeps/formats/yaml.dag:195-233.
  3. CODING.md. Compliant — no new Rust code, methods, hidden state, builders, or object-style implementation are introduced; the diff stays as data plus documented future operations, with the actual type declaration at src/v4/extdeps/formats/yaml.dag:234-241 and the “not bodiless fn” deferral rule stated at src/v4/extdeps/formats/yaml.dag:244-251.
  4. TESTING.md. N/A — no executable parse/emit body or runtime behavior lands in this PR; the diff is a declarative model plus tracked operation deferral, and the changed lines explicitly say no consumer reads yaml_parse/yaml_emit in this PR at src/v4/extdeps/formats/yaml.dag:266-274. A Rust test would not be the right level for this v4 .dag-authority-only slice under the uploaded zero-floor direction, which targets .dag/generated test surfaces rather than new hand-authored Rust tests. chatgpt-review-dcdeb7bb-f1a7-4a…
  5. LOCKED DESIGN DECISIONS. Compliant — the PR references ratified/locked seams and keeps them consistent rather than altering them: it states the canonical mirror and single-authority Outcome<T> seam at src/v4/extdeps/formats/yaml.dag:28-39, repeats the no-per-file-Result rule at src/v4/extdeps/formats/yaml.dag:59-68, and surfaces the immutable-header reconcile as tracked-not-silent rather than silently diverging at src/v4/extdeps/formats/yaml.dag:294-305.
  6. TRACKED vs UNTRACKED DEBT. Compliant — every scaffold I see has the required documentation, bounds, and dissolution trigger: parse/emit bodies at src/v4/extdeps/formats/yaml.dag:253-319, numeric interpretation at src/v4/extdeps/formats/yaml.dag:321-334, and canonical YAML mapping-key uniqueness at src/v4/extdeps/formats/yaml.dag:336-372. I did not find a new unbounded TODO, silent bridge, or temporary authority outside those tracked blocks.

2.5. Top-down PM intent review

Compliant — the highest-level authority says v4 is the active operational instantiation of the thesis, and the zero-floor program applies to v4 as .dag/generated structure rather than new hand-authored implementation. chatgpt-review-dcdeb7bb-f1a7-4a…

This PR preserves that intent: it adds one .dag format model, keeps parse/emit as future .dag operations with Outcome carriers, and does not introduce a Rust parser/emitter, target-private renderer, or permanent scaffold. The Shape-B direction is also preserved: YAML remains an artifact/data format modeled for user programs to walk and emit, not a new compiler render target or hand-coded emitter path. chatgpt-review-dcdeb7bb-f1a7-4a…

3. Verdict

APPROVE — I found no blocking invariant violation. The PR models the YAML value shape, fails closed on both parse and emit seams, and tracks the known YAML-specific gaps with bounded dissolution triggers instead of over-claiming structural guarantees.

briansrls added a commit that referenced this pull request May 16, 2026
…arse/emit seam (#3184)

* WIP: T-4.6 extdeps/formats/

* v4 T-4.6: json.dag — honest-scope the I-JSON unique-names profile boundary + split JsonNumber into 3 distinct triggers (token-validity/value/refined-type) (review #3184)

* WIP: T-4.6 extdeps/formats/

* v4 T-4.6: json.dag — reconcile top CARRIER SEAM summary to ratified corrected seam #3 (parse->Outcome<JsonValue>, emit->Outcome<String>); remove stale two-authorities emit-carrier divergence (seam-wide consistency, #3188 P2 caught it)
@briansrls
briansrls merged commit fdc710a into main May 16, 2026
7 checks passed
briansrls added a commit that referenced this pull request May 16, 2026
…seam (#3189)

* v4 T-4.6: model toml.dag — TomlValue + Outcome<TomlValue> seam (mirror canonical json.dag)

* v4 T-4.6: toml.dag — clarify §Array heterogeneity is TOML 1.0.0-faithful + §Array-of-Tables is a parse-construction (deferred), not a value variant (review #3189)

* v4 T-4.6: toml.dag — propagate ratified corrected seam #3: toml_emit : TomlValue -> Outcome<String> (fail-closed both directions); immutable-header reconcile tracked-not-silent (mgr seam-gate active-propagation msg_c7704bd6)

* v4 T-4.6: toml.dag — ADJUDICATED (T-4 seam-gate): InlineTable|Table collapse to one TomlTable is correct modeling (codex RC #3189 substantively right; §Array-of-Tables in-file precedent); body retained pending operator header-reconcile (csv-class); ledger pattern-2 corrected; tracked-not-silent

* v4 T-4.6: toml.dag — reconcile top CARRIER SEAM summary to ratified corrected seam #3 (parse->Outcome<TomlValue>, emit->Outcome<String>); remove stale two-authorities emit-carrier divergence (seam-wide consistency, #3188 P2 caught it)

* v4 T-4.6: toml.dag — Practice-4 pattern-5 ledger consistency: align with the adjudicated InlineTable|Table collapse (seven genuinely-distinct kinds; eighth = duplicated-map discriminant held pending header-reconcile, not 'two distinct constructs') (APPROVE_WITH_COMMENTS #3189 cursor)
@briansrls
briansrls deleted the t4.6/yaml branch June 1, 2026 18:43
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