public static ExtendibleMapFactory mediumSize() {
    //approx. 16M (key,value) pairs
    return new ExtendibleMapFactory(
      ExtendibleHashMap.DEFAULT_STORAGE_PAGE_SIZE,
      ExtendibleHashMap.DEFAULT_SEGMENT_SIZE,
      IGNORE_AND_HOPE_FOR_THE_BEST,
      /*eagerlyCheckFileCompatibility: */ true,
      /*cleanFileIfIncompatible:       */ false
    );
  }
public static ExtendibleMapFactory mediumSize()