public static Gson instance() {
        return SingletonHolder.INSTANCE;
    }
@Test
    void serializesCharsets() {
        assertThatJson(Serialization.instance().toJson(StandardCharsets.UTF_8)).isEqualTo("UTF-8");
        //noinspection CharsetObjectCanBeUsed
        assertThatJson(Serialization.instance().toJson(Charset.forName("ascii"))).isEqualTo("US-ASCII");
    }