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Pawel HurynandClaude Opus 5
76c51f3ae8
I had only used one repo's per-category survival table plus the other's aggregate numbers, and had not looked at the shipping repos' fix history at all. Reading all 105 planted bugs per-bug, and four weeks of real fixes, changed four things. Taxonomy is now thirteen lenses: - Lens 10 (representation and information loss) is promoted to the highest-frequency class in every corpus and given three named sub-shapes: the nullish family (pending/absent/empty/zero/false/failed collapsing into each other), projection and field-set drift (a producer quietly stops emitting a field, consumers degrade instead of failing), and unresolved values stored as resolved ones. Plus the cast/any/suppression tell - an annotation on a boundary marks where two sides disagreed and someone silenced the compiler. - Lens 12 gains reachability: a predicate nothing can satisfy, a handler never wired, a scheduler never started. Reads as correct code; common in the wild. - Lens 13, verification and observability, is new: the check that cannot fail, the oracle measuring the wrong thing, the effect whose absence nothing would notice. It carries a note on WHY it is new - a planted defect is detectable by construction, so silent failure is systematically absent from planted corpora and heavily represented in real fix histories. A checklist trained only on planted bugs will never prompt you to look here. Refutation gains "absorption is not prevention": a cache that usually holds, a retry that usually succeeds, a default that is usually right - none of those refute a finding, they postpone it. Drop only on a mechanism that makes the execution impossible. Corollary: "works nearly always" describes a race. Parallelism gains two constraints: - One model. Fan-out is for coverage, not a second opinion; workers run the coordinator's model. A single foreign worker makes a measured result unattributable. The independent second-model pass stays where it belongs, as an explicit /ship-check step. - Read-only workers. Read, search, navigate - no writes, edits or mutating commands. A worker that can edit drifts from reviewing into silently fixing, and the tree must end identical to how it started or findings cannot be checked against it. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01G42vsxSKL7je39AsHZ5aJm