Re: [fetch] PATCH verb (#50)

I think there is confusion here. PATCH is not explicitly listed in the HTTP verbs for normalization, which is the main problem. This means it is not normalized to uppercase like the rest of the HTTP verbs, and thus if a library attempts to use `patch` (lowercase), everything comes to a screeching halt, since the lowercase `patch` is not in the allowed methods for CORS. If the documentation can be modified to explicitly include `PATCH` in the list of HTTP verbs to normalize, I think this issue can be resolved easily.

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