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iswxdigit_l
POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/iswxdigit_l.html
Gnulib module: —
Portability problems fixed by Gnulib:
Portability problems not fixed by Gnulib:
wchar_t
is a 16-bit type and therefore cannot
accommodate all Unicode characters.