public double getRelevance() { return relevance; }
@Test
    void testNaN2negativeInfinity() {
        LeanHit nan = new LeanHit(gidA, 0, 0, Double.NaN);
        assertFalse(Double.isNaN(nan.getRelevance()));
        assertTrue(Double.isInfinite(nan.getRelevance()));
        assertEquals(Double.NEGATIVE_INFINITY, nan.getRelevance(), DELTA);
    }