glm-5.2
5588278451
POC: /workspace/alktype-builder-poc/ (11/11 tests pass, findings in docs/research/alktype-builder-poc/findings.md). The POC code lives outside the repo per the internal dev convention. Implementation: - src/builder.rs: Schema, Definitions, Discriminator types. Constructors for all 19 AlkType kinds + standard JSON Schema types (object/array/ string/integer/number/boolean/null/any). Setters for ADR-003 annotations (endian/align/encoding/max_length), composite builders (field/required/ items/mapping), and standard JSON Schema constraints (minimum/maximum/ minLength/minItems/maxItems/format/title/description). 16 unit tests. - src/materialize.rs: materialize_packed and materialize_aligned functions that walk a schema + buffer to produce a serde_json::Value tree. Recurses into Struct, Array, Union (byte-offset discriminator). Record is stubbed (deferred for the POC scope). - src/engine.rs: AlkTypeEngine::validate_bytes(&[u8]) added (ADR-010). Dispatches on layout mode, materializes Value, then validates against the existing jsonschema validator. 7 unit tests. - src/lib.rs: pub mod builder, pub mod materialize; re-exports Schema, Definitions, Discriminator. Verification: - cargo test: 346 -> 369 tests pass (23 new: 16 builder, 7 validate_bytes) - cargo clippy --all-targets -- -D warnings: clean - POC (11 tests): builder round-trip + validate_bytes (packed + aligned) + validate_json for call payloads; all pass Findings: - Top-level schema must be AlkType:Struct (existing constraint); unions are field types within a struct. Builder spec Example 3 needs a doc fix. - Builder field order preserved (preserve_order feature, load-bearing for packed mode). - validate_bytes correctly distinguishes Access (read phase) from Validation (validate phase) errors, with field paths. - validate_json path unchanged for call payloads. Open questions surfaced (OQ-005, OQ-006, OQ-007) tracked in findings.md; to resolve before the SFTP Packet POC round.