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wcwidth
POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/wcwidth.html
Gnulib module: wcwidth
Portability problems fixed by Gnulib:
-D_GNU_SOURCE
) on some platforms:
glibc 2.8.
Portability problems not fixed by Gnulib:
wchar_t
is a 16-bit type and therefore cannot
accommodate all Unicode characters.