docs: capture the TDD pattern for source-level parity gaps - #42
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#34/#36/#38/#39 all came from a full source-level audit against the builtin's actual Rust (pool_manager.rs, drivers/postgres/), not from the 82-test SQL-text parity suite -- every one lived in a code path that suite doesn't exercise (TLS/pool-config semantics, extract.rs's wire-format type dispatch). Recording where to look and how each was proven with a standalone unit test (no live DB/TLS handshake needed) so the next parity audit starts from this pattern instead of rediscovering it.
aesslinger
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This was referenced Aug 19, 2026
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Summary
#34/#36/#38/#39 (mTLS client-cert not honored, pool cache key ignoring TLS params,
verify-caenforcing hostname checks,MONEYdecoding tonull) were all found by a full source-level audit against the builtin's actual Rust source (pool_manager.rs,drivers/postgres/) — not by the 82-test SQL-text parity suite, since every one lived in a code path that suite doesn't exercise directly (TLS/pool-config semantics,extract.rs's wire-format type dispatch).Added two entries to CLAUDE.md's "Key Patterns" section:
extract.rs'sType::dispatch), since these are exercised by config values/column types rather than query shape.Docs-only, no behavior change.
Test plan
npx markdownlint CLAUDE.md— clean