Re: [ServiceWorker] Clients & postMessage (#609)

> What about the case when the sender is not controlled by the service worker? Should the source still be an instance of WindowClient/Client?

I think any instantiated `ServiceWorker` object can postMessage to the service worker represented by it regardless of the state of the service worker and the state it being controlled or not. `registration.installing.postMessage()` should also worker.

Yes, the `event.source` should be an instance of `WindowClient/Client`. Note that `self.clients.matchAll({ includeUncontrolled: true })` resolves with uncontrolled client in the shape of `WindowClient/Client` as well.

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