// o is either a map already (string->object) or an arbitrary object,
// in which case its fields are converted into a map.
static Map<S, O> objectToMap_nonTransient(O o) {
  if (o == null) null;
  if (o instanceof Map) ret (Map) o;
  
  new HashMap<S, O> map;
  for (Field field : nonStaticNonTransientFieldObjects_cachedArray(o)) {
    O value = fieldGet(field, o);
    if (value != null)
      map.put(field.getName(), value);
  }
  
  // TODO: Should we drop fieldValues key from map?
  if (o cast DynamicObject)
    putAll(map, o.fieldValues);

  ret map;
}