private static final long serialVersionUID = 0;
  }

  Object writeReplace() {
    return new SerializedForm<>(asMapOfRanges());
  }

  @J2ktIncompatible // java.io.ObjectInputStream
  private void readObject(ObjectInputStream stream) throws InvalidObjectException {
    throw new InvalidObjectException("Use SerializedForm");
  }

  private static final long serialVersionUID = 0;