docs: public DoubleHistogram copy() {
          final DoubleHistogram targetHistogram =
                  new DoubleHistogram(configuredHighestToLowestValueRatio, getNumberOfSignificantValueDigits());
          targetHistogram.setTrackableValueRange(currentLowestValueInAutoRange, currentHighestValueLimitInAutoRange);
          integerValuesHistogram.copyInto(targetHistogram.integerValuesHistogram);
          return targetHistogram;
      }