static void smartSet(Field f, O o, O value) throws Exception {
  f.setAccessible(true);
  
  // take care of common case (long to int)
  if (f.getType() == int.class && value instanceof Long)
    value = ((Long) value).intValue();
    
  try {
    f.set(o, value);
  } catch (Exception e) {
    ifclass Concept
      try {
        if (f.getType() == Concept.Ref.class) {
          f.set(o, ((Concept) o).new Ref(value));
          ret;
        }
        if (o instanceof Concept.Ref) {
          f.set(o, ((Concept.Ref) o).get());
          ret;
        }
      } catch {}
    endif
    throw e;
  }
}