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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.

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

Is rumour user → model? or the other way?

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Rumors are user to model, yes. Yeah, this approach still involves shared state.

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That said I think the jump could be much shorter that way (than propagating back w/ signal/lens/callback/etc).

in fact you could make the initializers private so you can _only_ make View via the appropriate ViewState.

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