*/
  @VisibleForTesting
  static int optimalNumOfHashFunctions(double p) {
    // -log(p) / log(2), ensuring the result is rounded to avoid truncation.
    return max(1, (int) Math.round(-Math.log(p) / LOG_TWO));
  }

  /**
   * Computes m (total bits of Bloom filter) which is expected to achieve, for the specified