MySQL 8.0 JSON columns may reorder associative-array keys on round-trip. For audit-immutable values (schema snapshots, webhook payloads, activity log diffs), this is corrupting: re-emits produce different byte sequences for the same logical content. Introduced JsonCanonicalizer (recursive ksort on associative arrays; numeric-indexed lists preserve order) and applied at every writer site that produces byte-stable JSON: - FormSubmissionService: canonicalize the schema_snapshot array before storage (audit-immutable per ARCH §4.3, RFC-WS-6 v1.1). - FormField::logFieldChange / FormSchema::logSchemaChange: canonicalize activity-log properties before withProperties() so old/new diffs read back byte-stable. - BindingActivityLogger: canonicalize both the pass-level and per-binding activity properties. - FormWebhookDispatcher: canonicalize payload_snapshot before storage (delivery-time HMAC re-encodes the same canonical bytes). - DeliverFormWebhookJob: switched json_encode to JsonCanonicalizer::encode for the HMAC-signed body, so the signature is byte-stable across re-deliveries and reproducible by receivers from the same logical payload. Sites NOT canonicalized (deliberate): - form_schemas.settings — opaque UI config; key order has no semantic meaning, no byte-stability requirement. - form_schemas.translations / form_fields.translations — read by display layer; key order doesn't matter. - form_templates.schema_snapshot — user-supplied input via store/ update; user is the source of truth, not audit-immutable in the same way as form_submissions.schema_snapshot. Reverted the 7 assertEquals workarounds from session 2.6: - ConditionalLogicActivityLogPayloadTest - ConditionalLogicBackfillTest::test_rollback_reconstructs_canonical_json - FormFieldBindingMigrationTest::test_rollback_reconstructs_json_and_drops_table - FormFieldOptionServiceAndScopeTest::test_replace_options_emits_activity_log_on_field_only - FormFieldOptionsActivityLogTest::test_field_updated_payload_contains_options_diff_when_options_change - FormFieldOptionsBackfillTest::test_forward_migration_backfills_rows_strips_translations_and_rewrites_snapshot - FormFieldOptionsSnapshotAndStrictRequestTest::test_submission_snapshot_embeds_rich_shape_options Each now uses assertSame on JsonCanonicalizer::encode of both sides — byte-stable comparison meaningful regardless of MySQL JSON storage behavior. New regression test SchemaSnapshotByteStableAcrossReemitsTest exercises the contract end-to-end: complex schema with bindings, validation rules, options, conditional logic, submitted; reads schema_snapshot via three roads (Eloquent cast, fresh model, raw bytes) and asserts the canonical encode is identical. ARCH-FORM-BUILDER.md §4.6.1 gets a "Byte-stability" sub-section explaining what's canonicalized and why. Test count: 1388 → 1400 (+11 JsonCanonicalizer unit, +1 snapshot regression). Larastan clean. Rector dry-run unchanged at 355. Refs: WS-6 session 2.6 deviation #4 cleanup, RFC-WS-6 v1.1 Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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