Conservative flattening circumscribes arcs, so at 0.01 the validator was up to 0.01 too strict along curves: PEP's P260626-03 layout, exactly 0.25 apart along an arc, failed with a 0.004 sliver. At 0.001 the worst error on either side is 0.001. Validating the 26-job benchmark set with Opus55 went from about 2 s to about 5 s. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>