docs: private static int[][] countCounts2IntArrays(Counter<Integer> countCounts) {
      int size = countCounts.size();
      int[][] arrays = new int[2][];
      arrays[0] = new int[size]; // counts
      arrays[1] = new int[size]; // count counts
      PriorityQueue<Integer> q = new PriorityQueue<Integer>(countCounts.keySet());
      int i = 0;
      while (!q.isEmpty()) {
        Integer count = q.poll();
        Integer countCount = (int) Math.round(countCounts.getCount(count));
        arrays[0][i] = count;
        arrays[1][i] = countCount;
        i++;
      }
      return arrays;
    }