Re: [ServiceWorker] ServiceWorkerClient to Client (#588)

> If getAll returns different types, given that workers are still pretty rare, I'm worried that code would appear to work, go live, then start failing because a worker was present.

Good point. Very interesting.

Is there a scenario when getAll() is useful without filtering by type? Your examples seem like they would benefit from a filter on window. Perhaps `clients.getWindows()` + `clients.getAll()` would be helpful for avoiding this?

> Assuming we went with the above, what API would you prefer for opening a window, considering a constructor here is undesirable? clients.openWindow(url), WindowClient.open(url)?

If I'm understanding correctly, any new window clients will be added to the collection of all clients, right? If so, then I think the former seems a bit nicer, since `clients.openWindow` modifying the return value of `clients.getAll` makes more sense than `WindowClient.open` doing so.

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