Federation: storing Objects when I do not store the rdf_type natively

Currently, when I receive a backlink for a model which I don't have a defined model for, I return 404 to the sender. As an alternative, I could store the model in a generic Object model with the target collection, and then provide a fallback view for any unknown nested_field which searches this storage

One consideration of this approach is that if I later create a Model which stores this rdf_type, my Objects will be inaccessible without some custom migration script