double expected6 = 999.999;
        doc.put("key6", expected6);
        assertEquals(expected6, DocumentUtil.getValue(doc, "key6", Double.class));
    }

    public void test_float() {
        Map<String, Object> doc = new HashMap<>();

        float expected7 = 999.999f;
        doc.put("key7", expected7);
        assertEquals(expected7, DocumentUtil.getValue(doc, "key7", Float.class));
    }