To make models that use new predicates that depend on world state correct, and perform better, I need to create a new return type from the model building operation which saves all dynamic model value entries so that the predicates can be checked against world state before the model is being picked.

Ideally this would be implemented by an async operation that could build the model async, and place it into the current model slot when it is ready. This should properly fix the issue #717

Closed in #730