commons-statistics-descriptive/src/main/java/org/apache/commons/statistics/descriptive/IntStatistics.java [684:727]:
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        return null;
    }

    /**
     * Gets the skewness.
     *
     * @return a skewness supplier (or null if unsupported)
     */
    private StatisticResult getSkewness() {
        if (moment instanceof SumOfCubedDeviations) {
            return new Skewness((SumOfCubedDeviations) moment)
                .setBiased(config.isBiased())::getAsDouble;
        }
        return null;
    }

    /**
     * Gets the standard deviation.
     *
     * @return a standard deviation supplier (or null if unsupported)
     */
    private StatisticResult getStandardDeviation() {
        return getVarianceOrStd(true);
    }

    /**
     * Gets the variance.
     *
     * @return a variance supplier (or null if unsupported)
     */
    private StatisticResult getVariance() {
        return getVarianceOrStd(false);
    }

    /**
     * Gets the variance or standard deviation.
     *
     * @param std Flag to control if the statistic is the standard deviation.
     * @return a variance/standard deviation supplier (or null if unsupported)
     */
    private StatisticResult getVarianceOrStd(boolean std) {
        if (sum != null && sumOfSquares != null) {
            // Return a function that has access to the count, sum and sum of squares
            final Int128 s = sum.getSum();
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commons-statistics-descriptive/src/main/java/org/apache/commons/statistics/descriptive/LongStatistics.java [662:705]:
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        return null;
    }

    /**
     * Gets the skewness.
     *
     * @return a skewness supplier (or null if unsupported)
     */
    private StatisticResult getSkewness() {
        if (moment instanceof SumOfCubedDeviations) {
            return new Skewness((SumOfCubedDeviations) moment)
                .setBiased(config.isBiased())::getAsDouble;
        }
        return null;
    }

    /**
     * Gets the standard deviation.
     *
     * @return a standard deviation supplier (or null if unsupported)
     */
    private StatisticResult getStandardDeviation() {
        return getVarianceOrStd(true);
    }

    /**
     * Gets the variance.
     *
     * @return a variance supplier (or null if unsupported)
     */
    private StatisticResult getVariance() {
        return getVarianceOrStd(false);
    }

    /**
     * Gets the variance or standard deviation.
     *
     * @param std Flag to control if the statistic is the standard deviation.
     * @return a variance/standard deviation supplier (or null if unsupported)
     */
    private StatisticResult getVarianceOrStd(boolean std) {
        if (sum != null && sumOfSquares != null) {
            // Return a function that has access to the count, sum and sum of squares
            final Int128 s = sum.getSum();
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