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Hmm... I'd like an UI component to use a channel for its subcomponents to communicate. It sounds like the right way to do that is with om/computed when the subcomponents are rendered (though I could be wrong; it just seems cleaner than putting the channel in the global app state). But I can't work out how to use computed props in a devcard, which would be awfully nice for testing. Anyone used computed props and devcards?