in lib/src/codepage.dart [319:327]
String convert(List<int> input, {bool allowInvalid = false}) {
var buffer = Uint32List(input.length);
for (var i = 0; i < input.length; i++) {
var byte = input[i];
if (byte & 0xff != byte) throw FormatException("Not a byte", input, i);
buffer[i] = _characters[byte];
}
return String.fromCharCodes(buffer);
}