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