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) {
    if (f.getType().getName().equals("main$Concept$Ref"))
      f.set(o, nuObject("main$Concept$Ref", o, value));
    else if (o.getClass().getName().equals("main$Concept$Ref"))
      f.set(o, call(o, "get"));
    else
      throw e;
  }
}