Re: [ServiceWorker] ServiceWorkerClient can't be a MessageEvent.source because it's not a WindowProxy or MessagePort (#453)

What objects can cause `self.onmessage` to fire? The current design seems somewhat odd, but I guess `source` needs to point to `ServiceWorkerClient` or its `MessagePort`... @Hixie?

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https://github.com/slightlyoff/ServiceWorker/issues/453#issuecomment-66268093