disable all the above Unicode features.
The read-only magic variable C<${^UNICODE}> reflects the numeric value
-of this setting. This is variable is set during Perl startup and is
+of this setting. This variable is set during Perl startup and is
thereafter read-only. If you want runtime effects, use the three-arg
open() (see L<perlfunc/open>), the two-arg binmode() (see L<perlfunc/binmode>),
and the C<open> pragma (see L<open>).