sbool matchRecordWithTypes(IFieldsToList record, Class... types) {
  O[] l = record._fieldsToList();
  int n = l(l);
  if (n != l(types))
    fail("Wrong number of arguments for " + className(record) + " " + asList(types));
  for i to n:
    if (!isInstanceX(types[i], l[i]))
      false;
  true;
}