return caches.getAnyOf(new ExcludesKey(specs), key -> delegate.anyOf(key.specs));
    }

    @Override
    public ExcludeSpec allOf(Set<ExcludeSpec> specs) {
        return caches.getAllOf(new ExcludesKey(specs), key -> delegate.allOf(key.specs));
    }

    /**
     * A special key which recognizes the fact union and intersection
     * are commutative.
     */