return parentMutationGuard.withMutationDisabled(super.withMutationDisabled(action));
    }

    @Override
    protected boolean hasWithName(String name) {
        return (project.getModelRegistry() != null && project.getModelRegistry().state(ModelPath.path("tasks." + name)) != null) || super.hasWithName(name);
    }

    @Override
    public NamedDomainObjectCollectionSchema getCollectionSchema() {

    public boolean addAll(int index, Collection<? extends T> c) {
        assertMutable("addAll(int, Collection)");
        boolean changed = false;
        int current = index;
        for (T t : c) {
            if (!hasWithName(getNamer().determineName(t))) {
                getStore().add(current, t);
                didAdd(t);
                getEventRegister().fireObjectAdded(t);
                changed = true;
                current++;