default ImmutableSet<InheritanceNode> inheritanceAsImmutableSet() {
        ImmutableSet.Builder<InheritanceNode> builder = ImmutableSet.builder();
        copyInheritanceNodesTo(builder);
        return builder.build();
    }
A map of nodes held by a {@link PermissionHolder}.
common/src/main/java/me/lucko/luckperms/common/model/nodemap/NodeMap.java