Tbh I think the issue here is that you use a LiveComponent to subscribe to PubSub in the first place. Given LiveComponents are indeed not processes you’re essentially leaking a subscription onto the parent LiveView as a sideeffect, which then materializes by the fact that you cannot clean that up anymore. I agree that this is a limitation to what a LiveComponent can encapsulate, but imo the solution isn’t an unmount callback. Even with that there would still be no handle_info callback as well, so you’re still dependant on the parent LV.
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