List<String> getAnnotValues(Annotated a, String... annotKeys) {
        List<String> result = new ArrayList<>(annotKeys.length);
        for (String k : annotKeys) {
            String v = a.annotations().value(k);
            if (v == null) {
                return null;
            }
            result.add(v);
        }
        return result;
    }
@Test
    public void annotValues() {
        title("annotValues()");
        verifyValues(t2.getAnnotValues(THING, K1), V1);
        verifyValues(t2.getAnnotValues(THING, K3, K1), V3, V1);
        verifyValues(t2.getAnnotValues(THING, K1, K2, K3), V1, V2, V3);
        verifyValues(t2.getAnnotValues(THING, K1, K4));
    }