static DynamicObject mapMethodLike dynamicObject(S className, O... x) {
  DynamicObject d = new DynamicObject(className);
  for (int i = 0; i < x.length-1; i += 2)
    if (x[i+1] != null)
      setDyn(d, (S) x[i], x[i+1]);
  ret d;
}