Re: [w3c/manifest] Added an Uninstallation section. (#678)

> Wow, #TIL. To me, if something "should" be a certain way sounds stronger than if something is "recommended" to be a certain way. Luckily the RFC has us non-native speakers covered.

It isn't really a non-native-English thing. I think informally, "should" is stronger than "recommended". "You should clean your room" is stronger than "I recommend that you clean your room".

To be honest, the way I wrote this was (despite the RFC prescribing these words the exact same meaning) intentionally to make the first statement a little stronger than the first. Obviously there should be an uninstall process (though we can't mandate it). It seems a little less necessary that the UA offer to clean up related settings and things, especially since the scopes may not exactly match (lots of these permissions are origin-scoped, which may be overly broad), so it's not obvious even how to do this correctly.

So I could have written it more forcefully as "The user agent SHOULD also present the user with an opportunity..." but I deliberately chose a passive voice, "It is RECOMMENDED that at the time of removal, the user agent also presents the user with an opportunity...", because it's less clear whether or how to do this.

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