* While this is not needed for small scales, this is important for the long tail of massive clusters (think 1 million endpoints), where the entire set of endpoints cannot reasonably be replicated to each ztunnel.
* It should not be client-specific.

      BigInteger.valueOf(Long.MAX_VALUE)
          .multiply(BigInteger.valueOf(Long.MAX_VALUE))
          .divide(BigInteger.valueOf(16L))
          .doubleValue();

  /**
   * Returns a stream of a million primitive doubles. The stream is parallel, which should cause
   * {@code collect} calls to run in multithreaded mode, so testing the combiner as well as the
   * supplier and accumulator.
   */