public static boolean isAmbiguousKeyPossible(
            TypeSerializer keySerializer, TypeSerializer namespaceSerializer) {
        return (isSerializerTypeVariableSized(keySerializer)
                && isSerializerTypeVariableSized(namespaceSerializer));
    }
@Test
    void testIsAmbiguousKeyPossible() {
        assertThat(
                        CompositeKeySerializationUtils.isAmbiguousKeyPossible(
                                IntSerializer.INSTANCE, IntSerializer.INSTANCE))
                .isFalse();

        assertThat(
                        CompositeKeySerializationUtils.isAmbiguousKeyPossible(
                                StringSerializer.INSTANCE, StringSerializer.INSTANCE))
                .isTrue();
    }