operate using the character set of the platform Perl is running on. The ones
with an C<_A> suffix operate on the ASCII character set, and the ones with an
C<_L1> suffix operate on the full Latin1 character set. All are unaffected by
-locale
+locale.
For ASCII platforms, the base function with no suffix and the one with the
C<_A> suffix are identical. The function with the C<_L1> suffix imposes the