static void setOptAll(O o, Map<S, O> fields) {
  if (fields == null) ret;
  for (S field : keys(fields))
    setOpt/*_flex*/(o, field, fields.get(field));
}

static void setOptAll(O o, O... values) {
  //values = expandParams(c.getClass(), values);
  warnIfOddCount(values);
  for (int i = 0; i+1 < l(values); i += 2) {
    S field = (S) values[i];
    O value = values[i+1];
    setOpt(o, field, value);
  }
}