docs: public void add(final DoubleHistogram fromHistogram) throws ArrayIndexOutOfBoundsException {
          int arrayLength = fromHistogram.integerValuesHistogram.countsArrayLength;
          AbstractHistogram fromIntegerHistogram = fromHistogram.integerValuesHistogram;
          for (int i = 0; i < arrayLength; i++) {
              long count = fromIntegerHistogram.getCountAtIndex(i);
              if (count > 0) {
                  recordValueWithCount(
                          fromIntegerHistogram.valueFromIndex(i) *
                                  fromHistogram.integerToDoubleValueConversionRatio,
                          count);
              }
          }
      }