static AutoCloseable nuLike onConceptChangeByClass_notOnAllChanged(Concepts cc default db_mainConcepts(), Class type, Runnable r) {
  ret tempAddConceptIndex(cc, new IConceptIndex {
    public void update(Concept c) { if (instanceOf(c, type)) pcallF(r); }
    public void remove(Concept c) { if (instanceOf(c, type)) pcallF(r); }
  });
}