Re: [fetch] Cache mode: fromCache (#40)

Hmm... Given that the security concerns would be largely circumvented if the server allows the client to sends `If-Modified-Since`, `If-None-Match`, etc, it might be possible to use this to enable this feature for such CORS requests?

Of course this would require a CORS pre-flight request to discover, which means that the `fromCache` attribute would require a special mode / flag to enable on a request.

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