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wctype
POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/wctype.html
Gnulib module: wctype
Portability problems fixed by Gnulib:
<wchar.h>
, not in <wctype.h>
, on
some platforms:
HP-UX 11.00.
Portability problems not fixed by Gnulib:
wchar_t
is a 16-bit type and therefore cannot
accommodate all Unicode characters.