numtostring.dart

  String numToString(BigInt number) {
    final buf = StringBuffer();

    for (var v = 0; v < 8; v++) {
      final charCode = (number & BigInt.parse('0xFF' + ('00' * v))) >> v * 8;
      buf.write(String.fromCharCode(charCode.toInt()));
    }
    return buf.toString();
  }