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I think I could avoid the need for lenses-as-rumours by wrapping the view/controller instances in value types.

so Document has WindowControllerState, WindowControllerState has GraphViewState, GraphViewState has NodeViewState…

and each *State type also has a property of the corresponding ref type, WindowController, GraphView, NodeView, &c.

basically turn the reference types inside out.

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And the rumors flow up by directly invoking methods on the refs?

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Is rumour user → model? or the other way?

Actually tho I think this doesn’t really resolve much. user → model still involves a ref so it still has to share state 😞