Re: [w3c/ServiceWorker] Reduce GC exposure (#1127)

Not really.  I think I was mostly talking about canary style GC detection where you call `postMessage()` in a loop and the receiving side can tell when the messages stop coming.  I can't remember the full context of this issue.

I also didn't really think we needed to fix anything.  IMO hiding GC behavior is a best effort issue, but there are probably always going to be some side channel timing leaks.

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