code: function(str){
      return str.replace(FOUR_PART_NOTATION_RE, 
        function(){
          if(arguments[1] == 'border-radius') return arguments[0]
          return arguments[1] + arguments[2] + ':' + arguments[3]
                              + [arguments[4], arguments[7], arguments[6], arguments[5]].join(' ');
        }
      );
    }
docs: Fixes four part notation, for example `border: 1px 2px 3px 4px` will be rewritten to `border: 1px 4px 3px 2px`