public void addMember(Node node) {
        for (FinalizerGroup group : finalizerGroups) {
            group.addMember(node);
        }
    }

    @Override
    public void removeMember(Node node) {
        for (FinalizerGroup group : finalizerGroups) {
            group.removeMember(node);
        }
    }

    @Override
    public Set<FinalizerGroup> getFinalizerGroups() {
        return finalizerGroups;
    }

                    FinalizerGroup(finalizerNode, delegate)
                }

                2 -> {
                    val reachableFromCommandLine = readBoolean()
                    val ordinalGroup = readNodeGroup(nodesById)
                    val groups = readCollectionInto(::HashSet) { readNodeGroup(nodesById) as FinalizerGroup }