I can't use multibyte char to attribute

[ysakkk]

input:submit.btn.primary(value="てすと")
will be
<input class="btn primary" value="てすと")

so i modified Lexer/Lexer.php like following.
it's seems ok, what do you think?

diff --git a/src/Everzet/Jade/Lexer/Lexer.php b/src/Everzet/Jade/Lexer/Lexer.php
index 16c55ab..6be2d1a 100644
--- a/src/Everzet/Jade/Lexer/Lexer.php
+++ b/src/Everzet/Jade/Lexer/Lexer.php
@@ -426,6 +426,23 @@ class Lexer implements LexerInterface
$dbrac = false;

     for ($i = 0, $length = mb_strlen($string); $i < $length; ++$i) {

•                 $c = mb_substr($string,$i,1);
  

•        if ('"' === $c) {
  

•            $dbrac = !$dbrac;
  

•        } elseif ('\'' === $c) {
  

•            $sbrac = !$sbrac;
  

•        }
  

•        if (!$sbrac && !$dbrac && $begin === $c) {
  

•            ++$nbegin;
  

•        } elseif (!$sbrac && !$dbrac && $end === $c) {
  

•            if (++$nend === $nbegin) {
  

•                $position = $i;
  

•                break;
  

•            }
  

•        }
  

•     /*
       if ('"' === $string[$i]) {
           $dbrac = !$dbrac;
       } elseif ('\'' === $string[$i]) {
  

  @@ -440,6 +457,7 @@ class Lexer implements LexerInterface
  break;
  }
  }

•             */
   }