code: public CacheStats minus(CacheStats other) {
      return new CacheStats(
          Math.max(0, hitCount - other.hitCount),
          Math.max(0, missCount - other.missCount),
          Math.max(0, loadSuccessCount - other.loadSuccessCount),
          Math.max(0, loadExceptionCount - other.loadExceptionCount),
          Math.max(0, totalLoadTime - other.totalLoadTime),
          Math.max(0, evictionCount - other.evictionCount));
    }
docs: Returns a new {@code CacheStats} representing the difference between this {@code CacheStats}
  and {@code other}. Negative values, which aren't supported by {@code CacheStats} will be
  rounded up to zero.