c0's point on R-286: the reader is unambiguous now, but the roster fallback that made the failure look like success is still reachable. Narrowly closed -- sixteen of the seventeen scenarios declare no cast and are rightly checked against the whole roster, so only a marker that is PRESENT and names nobody is refused, with its line named. Replacing the declaration with <!-- cast: --> passes before this change and fails after it. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>