The suffix and remainder regexes were most of a new file's description (333k on boneless 2026): now plain byte matching, with the regex versions kept as the reference in a test of tricky names and subjects. mimalloc for the many small strings. Boneless 2026: 360k -> 495k headers/s; check.ts still finds the outputs identical on all three captures. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>