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+@node towlower
+@section @code{towlower}
+@findex towlower
+
+POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/towlower.html}
+
+Gnulib module: wctype-h
+
+Portability problems fixed by Gnulib:
+@itemize
+@item
+This function is missing on some platforms:
+IRIX 5.3, Solaris 2.5.1.
+@item
+This function returns values of which the upper 16 bits are incorrect
+on some platforms:
+mingw.
+@end itemize
+
+Portability problems not fixed by Gnulib:
+@itemize
+@item
+On AIX and Windows platforms, @code{wchar_t} is a 16-bit type and therefore cannot
+accommodate all Unicode characters.
+@end itemize