FormError and StoreRefusal display no caller identifiers; clap value errors name the flag and reason only. One is_calendar_date serves admitted_on and the pronunciation date. A text with no base letter or digit (Lm or M only) is refused beside the no-alphanumeric refusal; modifier_letters.txt is the Lm table its test walks.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>