Re: [w3c/ServiceWorker] consider allowing multiple worker thread instances for a single registration (#756)

> @wanderview maybe you are right. Anyway, this all seems like a major breaking change.

Well, yes.  Removing `ServiceWorker.postMessage()` is probably (?) too breaking.  I was just lamenting that it ties our hands in this issue and perhaps may not really be needed.

Anyway, from an implementation point of view I don't think Mozilla will be pursuing multiple SW thread instances right now.  If its something other browser vendors strongly want then I'd like to see more of a proposal about how to address web compat issues.

Perhaps a first step could be getting use counter information for `ServiceWorker.postMessage()` from the window.  @jakearchibald does chrome collect that today?

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