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

@annevk wrote:
> @KenjiBaheux we did not discuss a return value for postMessage(). Wouldn't exposing one expose GC?

Not really, there are many reasons why the postMessage could fail, such as the user having closed the tab, or JS having navigated the tab to a non-same-origin URL.

It's #626 which would arguably expose evicted tabs (which I think is what you refer to by GC).

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