boolean rescaleNeeded() {
        return (initialScores_low > finalScores_low
                &&
                initialScores_high >= initialScores_low
                &&
                finalScores_high >= finalScores_low);
    }
@Test void increasingScoresNoNeed() {
        var adjuster = new RangeAdjuster();
        rerank(adjuster, 1.0, 2.0);
        rerank(adjuster, 3.0, 4.0);
        rerank(adjuster, 2.0, 3.0);
        assertFalse(adjuster.rescaleNeeded());
    }