*
   * @since 15.0 (since 12.0 in HashCodes)
   */
  public static HashCode fromLong(long hash) {
    return new LongHashCode(hash);
  }

  private static final class LongHashCode extends HashCode implements Serializable {
    final long hash;

    LongHashCode(long hash) {
      this.hash = hash;
    }

    @Override
    public int bits() {
      return 64;
    }