* versions.
   */
  public byte[] toByteArray() {
    ByteBuffer buffer = ByteBuffer.allocate(BYTES).order(ByteOrder.LITTLE_ENDIAN);
    xStats.writeTo(buffer);
    yStats.writeTo(buffer);
    buffer.putDouble(sumOfProductsOfDeltas);
    return buffer.array();
  }

  /**
   * Creates a {@link PairedStats} instance from the given byte representation which was obtained by

   * versions.
   */
  public byte[] toByteArray() {
    ByteBuffer buffer = ByteBuffer.allocate(BYTES).order(ByteOrder.LITTLE_ENDIAN);
    xStats.writeTo(buffer);
    yStats.writeTo(buffer);
    buffer.putDouble(sumOfProductsOfDeltas);
    return buffer.array();
  }

  /**
   * Creates a {@link PairedStats} instance from the given byte representation which was obtained by

 * has not actually been put in the {@code BloomFilter}.
 *
 * <p>Bloom filters are serializable. They also support a more compact serial representation via the
 * {@link #writeTo} and {@link #readFrom} methods. Both serialized forms will continue to be
 * supported by future versions of this library. However, serial forms generated by newer versions

   * versions.
   */
  public byte[] toByteArray() {
    ByteBuffer buff = ByteBuffer.allocate(BYTES).order(ByteOrder.LITTLE_ENDIAN);
    writeTo(buff);
    return buff.array();
  }

  /**
   * Writes to the given {@link ByteBuffer} a byte representation of this instance.
   *

    BloomFilter<byte[]> bf = BloomFilter.create(funnel, 100);
    for (int i = 0; i < 100; i++) {
      bf.put(Ints.toByteArray(i));
    }

    ByteArrayOutputStream out = new ByteArrayOutputStream();
    bf.writeTo(out);

    BloomFilter<byte[]> read =
        BloomFilter.readFrom(new ByteArrayInputStream(out.toByteArray()), funnel);
    assertThat(read).isEqualTo(bf);
    assertThat(read.expectedFpp()).isGreaterThan(0);
  }