Re: [w3c/ServiceWorker] Add a script version property to the ServiceWorker object (#1387)

It sounds like this ends up being a variation of https://github.com/w3c/ServiceWorker/issues/1331.  In particular, if a string length limit/grammar isn't imposed on scriptVersion, it seems likely it would end up being used for arbitrary JSON storage, etc.

As I understand your link's suggested best practices, the idea is that by changing the underlying script the automatic update checks will upgrade your script for you when the byte-comparison check indicates the script/its dependencies have changed.  It doesn't seem like your proposal addresses how the scriptVersion would be updated in this case where the triggering event was not a call to `register`.

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