Re: [ServiceWorker] Cache transactions & fixing `addAll` (#823)

> By the time you get to the .delete(request), the response that gets deleted may not be the response you decided was too old. Another may have add in the meantime time.

So we have responses of wildly varying size being stored under the same request?  What kind of html resources have this characteristic? I'm probably wrong, but it seems to me resources are mostly stable in size over the short term.

Also, they could use a vary header to avoid this situation, no?

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