Re: [fetch] PATCH verb (#50)

HTTP verbs are case-sensitive. That we normalize a couple of them is already, strictly speaking, against the rules, but we have to do so for compatibility. If you want to use `PATCH`, write `PATCH`. If you want `patch`, write `patch`. If you want `Patch`, write `Patch`. Etc. None of this has anything to do with CORS, they should all work equally well.

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