The Unification of vendor extensions PR doesn't introduce any specification wording on what happens when a user mixes the explicit graph building mechanism with the record & replay mechanism on the same modifiable graph

If a modifiable graph is being recorded to by a queue, and then the user uses explicit APIs to add nodes to the same graph before the recording has finished, is that okay? We should specify if that's valid or not.

Another possible scenario is if a modifiable graph contains nodes which have been explicitly added, and then the user goes and records more commands to it from a queue. Is that okay? I would assume so, but again we should specify explicitly in the spec.