sum += value.get();
    }
    return Ints.saturatedCast(sum);
  }

  /*
   * Note: the superclass toArray() methods assume that size() gives a correct
   * answer, which ours does not.
   */

  @Override
  public Object[] toArray() {
    return snapshot().toArray();
  }

  @Override
  @SuppressWarnings("nullness") // b/192354773 in our checker affects toArray declarations