[whatwg/fetch] Why `max-age=0` for `no-cache` mode ? (#1121)

https://fetch.spec.whatwg.org/#http-network-or-cache-fetch


> 13. If httpRequest’s cache mode is "no-cache", httpRequest’s prevent no-cache cache-control header modification flag is unset, and httpRequest’s header list does not contain `Cache-Control`, then append `Cache-Control`/`max-age=0` to httpRequest’s header list.

I don't understand why not use `Cache-Control: no-cache` but use  `Cache-Control: max-age=0` for no-cache mode ?
I think this change happens in #232 but it mentions Gecko's behavior only and no reason why to do that.
Cache-Control is HTTP/1.1 so it reasonable using Pragma for HTTP/1.0, but `no-cache` and `max-age` is in the same spec so it seems that there are no reason to use `no-cache` instead of `max-age=0` for me.

cc. @annevk @ehsan 

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