return emptySet();
  }

  protected Collection<Method> suppressForEmptyMap() {
    return emptySet();
  }

  private static Collection<Method> suppressForEmptyNavigableMap() {
    return emptySet();
  }

  private static Collection<Method> suppressForEmptySortedMap() {
    return emptySet();
  }

  protected Collection<Method> suppressForSingletonMap() {