static Map<O, Bool> autoCleanUp_list = synchroMap(new WeakHashMap);

static void autoCleanUp_list(O o) {
  if (o != null)
  autoCleanUp_list.put(o, true);
}

static void cleanMeUp_autoCleanUp() {
  L l = cloneList(keys(autoCleanUp_list));
  autoCleanUp_list.clear();
  cleanUp(l);
}