Commit c7fbd59

are those in the basic character set\iref{lex.charset}.

For any named \tcode{ctype} category with

valid \tcode{ctype_base::mask} value \tcode{M},

\tcode{(ctc.\brk{}is(M, c) || !is(M, do_widen(c)) )} is \tcode{true}.

\begin{footnote}