anchor.diff:     * You may optionally specify the beginning CRC value.
      */
     static int compute(var input, [int crc = 0]) {
  -    if (input is List<int>)
  -      input = new String.fromCharCodes(input);
  +    if (input is List<int>) input = new String.fromCharCodes(input);
   
       crc = crc ^ (-1);
   
  
positive.code: 
      return crc;
    }
  }
  
negative.code:  * Computes cyclic redundancy check values.
   */
  class CRC32 {
    /**
     * Computes a CRC32 value for the given input.
     *
  