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Both guards are ADDITIVE. The full suite (4,111 -> 4,126 tests, 331 suites) passes unchanged through the migration, which is the evidence that no currently-correct output moved: served path, champion, reference ruler and the four accruing challengers are byte-identical. GUARD 1 -- src/utils/known.js. Number(null)===0 has produced at least SIX separate defects here, including one in a module written the same week its author documented the trap. Per-module vigilance has demonstrably failed, so the rule lives in one place and SEVEN sites now delegate: platoonSplits, projectionChallenger, challengerProjection, contactChallenger, statcastAggregateService, consensusRuler, gradeRanking -- plus compoundTotalBases moved onto knownRate. Two functions, deliberately: knownNumber (any finite number -- a REAL 0 is a fact and must survive) and knownRate (non-negative, rejects booleans -- for counts/rates where `true` or -1 is broken, not thin). Collapsing them is how the next variant gets in. firstKnown() exists because `a || b` discards a measured 0 and `a ?? b` does not. MY OWN GUARD HAD THE BUG IT EXISTS TO PREVENT, and its own test caught it: Number([]) === 0, so an empty array coerced to a measured ZERO. Same trap wearing a different type. Both helpers now reject objects outright. GUARD 2 -- src/config/takeability.js. Takeability is BOOK IDENTITY and never price shape. Baseball prop markets are genuinely thin, juiced and one-sided, and all three are NORMAL structure: betrivers and hardrockbet legitimately quote one side only (5 such rows surfaced in yesterday's re-stamp), and a hits-over at -300 is a real placeable bet. A rule that inferred un-takeability from price extremity or one-sidedness would throw those away while still admitting a DFS book at an ordinary -119 -- exactly backwards, because the -119 is the fake one. THE DISTINCTION THAT MUST NOT COLLAPSE, now enforced by test: isTakeableMarket(book) -- CAN it be bet? (identity) isWithinPriceBand(odds) -- SHOULD we promote? (policy band, floor -160) A -300 DraftKings prop is takeable AND out of band; a PrizePicks -119 is in band AND not takeable. Independent axes. FLAGGED, NOT SILENTLY CHANGED: the ledger's `takeable` column is the PRICE-BAND answer, and its name predates this distinction. Four challengers and the ranking gate read it, so renaming or redefining it is its own order -- doing it here would have changed correct current behaviour under cover of a hardening change. Fixtures are REAL prod rows from the 2026-08-02 re-stamp, not invented. Gates: 4,126 tests / 331 suites green; next build exit 0. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01QJs13VsyiSKYQP6rj3NNmc