in lib/src/codepage.dart [362:376]
String _convertAllowInvalid(List<int> bytes) {
var count = bytes.length;
var codeUnits = Uint16List(count);
for (var i = 0; i < count; i++) {
var byte = bytes[i];
int character;
if (byte == byte & 0xff) {
character = _characters.codeUnitAt(byte);
} else {
character = 0xFFFD;
}
codeUnits[i] = character;
}
return String.fromCharCodes(codeUnits);
}