});
    }

    private static <T> EvaluatableFilter<T> filter(Function<ImmutableSet<String>, T> initializer, T emptyValue) {
        return new EvaluatableFilter<>(initializer, emptyValue);
    }

    private static class EvaluatableFilter<T> {
        private T value;
        private final Supplier<T> valueSupplier;