code: String lastLink() {
      if (totalResults == null || currentLimit == 0L) {
        return null;
      }
  
      Long lastOffset;
      if (totalResults % currentLimit == 0L) {
        lastOffset = totalResults - currentLimit;
      } else {
        // Truncation due to integral division gives floor-like behavior for free.
        lastOffset = totalResults / currentLimit * currentLimit;
      }
  
      return urlWithUpdatedPagination(lastOffset, currentLimit);
    }
docs: Returns the last page link; null if no last page link is available.