Wide character in %s
           (W utf8) Perl met a wide character (>255) when it
           wasn't expecting one.  This warning is by default on
           for I/O (like print).  The easiest way to quiet this
           warning is simply to add the ":utf8" layer to the out-
           put, e.g. "binmode STDOUT, ':utf8'".  Another way to
           turn off the warning is to add "no warnings 'utf8';"
           but that is often closer to cheating.  In general, you
           are supposed to explicitly mark the filehandle with an
           encoding, see open and "binmode" in perlfunc.