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Common module types
A function for testing whether the model has changed enough to require refiring the incremental graph.
It's best if the values in the model support a semantically reasonable cutoff function which lets you avoid infinite recomputation loops that can otherwise be triggered by the visibility checks. For this reason, it's typically a good idea to avoid having simple closures stored in the model.
That said, it does work if you put phys_equal in for the cutoff.