docs: public double getPercentileAtOrBelowValue(final long value) {
          if (getTotalCount() == 0) {
              return 100.0;
          }
          final int targetIndex = Math.min(countsArrayIndex(value), (countsArrayLength - 1));
          long totalToCurrentIndex = 0;
          for (int i = 0; i <= targetIndex; i++) {
              totalToCurrentIndex += getCountAtIndex(i);
          }
          return (100.0 * totalToCurrentIndex) / getTotalCount();
      }