anchor.diff:    static void _setUint32AtTail(ByteData _buf, int tail, int x) {
       _buf.setUint32(_buf.lengthInBytes - tail, x, Endianness.LITTLE_ENDIAN);
     }
  -
  -  static void _setUint64AtTail(ByteData _buf, int tail, int x) {
  -    _buf.setUint64(_buf.lengthInBytes - tail, x, Endianness.LITTLE_ENDIAN);
  -  }
   }
   
   /**
  
positive.code: 
    int _getUint32([int delta = 0]) =>
        _buffer.getUint32(_offset + delta, Endianness.LITTLE_ENDIAN);
    int _getUint64([int delta = 0]) =>
        _buffer.getUint64(_offset + delta, Endianness.LITTLE_ENDIAN);
  
    /**
     * If the [byteList] is already a [Uint8List] return it.
  
negative.code: 
    @override
    int get length {
      _length ??= bp._getUint32();
      return _length;
    }
  
  