commons-statistics-descriptive/src/main/java/org/apache/commons/statistics/descriptive/Int128.java [167:192]:
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        int sign = 1;
        if ((h ^ l) < 0) {
            // Opposite signs and lo64 is not zero.
            // The lo64 bits are an adjustment to the magnitude of hi64
            // to make it smaller.
            // Here we rearrange to [2^64 * (hi64-1)] + [2^64 - lo64].
            // The second term [2^64 - lo64] can use lo64 as an unsigned 64-bit integer.
            // The first term [2^64 * (hi64-1)] does not work if low is zero.
            // It would work if zero was detected and we carried the overflow
            // bit up to h to make it equal to: (h - 1) + 1 == h.
            // Instead lo64 == 0 is handled as a special case above.

            if (h >= 0) {
                // Treat (unchanged) low as an unsigned add
                h = h - 1;
            } else {
                // As above with negation
                h = ~h; // -h - 1
                l = -l;
                sign = -1;
            }
        } else if (h < 0) {
            // Invert negative values to create the equivalent positive magnitude.
            h = -h;
            l = -l;
            sign = -1;
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commons-statistics-descriptive/src/main/java/org/apache/commons/statistics/descriptive/Int128.java [217:232]:
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        int sign = 1;
        if ((h ^ l) < 0) {
            // Here we rearrange to [2^64 * (hi64-1)] + [2^64 - lo64].
            if (h >= 0) {
                h = h - 1;
            } else {
                // As above with negation
                h = ~h; // -h - 1
                l = -l;
                sign = -1;
            }
        } else if (h < 0) {
            // Invert negative values to create the equivalent positive magnitude.
            h = -h;
            l = -l;
            sign = -1;
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