// Not public. Evaluation of these specs is a major hot spot for large builds, so use an array for iteration
    Spec<? super T>[] getSpecsArray() {
        return specs;
    }

    public List<Spec<? super T>> getSpecs() {
        return Collections.unmodifiableList(Arrays.asList(specs));
    }

    public boolean isEmpty() {
        return specs.length == 0;
    }

    @Override
    public final boolean equals(Object o) {