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  1. or download this
    binmode STDOUT, ':utf8';
    my $strA = "Bob\x{B4}s files";
    ...
    say "strings are " . (($strA eq $strB) ? "eq" : "not eq");
    say "strA flag is: ".Encode::is_utf8($strA);
    say "strB flag is: ".Encode::is_utf8($strB);
    
  2. or download this
      if (!Encode::is_utf8($str) && $str =~ m/\x80-\xff/) {
        $str = Encode::encode_utf8($str); # Get utf8 byte seq
        Encode::_utf8_on($str);           # and flip the flag
      }