Yes, but when i use encode_utf8() to convert already known value from string to octets before comparing with newly posted value I can't see any difference berween values.

  my $par1 = $posted_value;        # not marked as utf8 yet
  my $par2 = $already_known_value; # marked as utf8
  my $res  = 0;
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When params are converted to octets and then compared result is - equal.

  # code1 - compare octets
  $par1 = Encode::encode_utf8($par1) if Encode::is_utf8($par1);
  $par2 = Encode::encode_utf8($par2) if Encode::is_utf8($par2);
  $res = ($par1 eq $par2) ? 1 : 0;
  # $res now contain 1 - $par1 and $par2 are equal
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But when try convert to string and compare after, then result is - not equal because posted value is still not mared as utf8. I allready use the same form with the same data for posting.

  # code2 - compare strings
  $par1 = Encode::decode_utf8($par1) if !Encode::is_utf8($par1);
  $par2 = Encode::decode_utf8($par2) if !Encode::is_utf8($par2);
  $res = ($par1 eq $par2) ? 1 : 0;
  # $res now contain 0 - $par1 and $par2 are not equal
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