default LinkedHashSet<InheritanceNode> inheritanceAsSet() {
        LinkedHashSet<InheritanceNode> set = new LinkedHashSet<>();
        copyInheritanceNodesTo(set);
        return set;
    }
A map of nodes held by a {@link PermissionHolder}.
common/src/main/java/me/lucko/luckperms/common/model/nodemap/NodeMap.java