buffer property
override
    Implementation
@override
Uint8List get buffer {
  if (isHex == true) {
    if (value.startsWith("0x")) {
      return value.substring(2).hexToBytes;
    }
    return value.hexToBytes;
  }
  if (value.startsWith("0x")) {
    return value.substring(2).hexToBytes;
  }
  return utf8.encode(value);
}