Re: [whatwg/fetch] Optional disable setting headers keys in lowercase (#304)

The current plan is that for H1 network traffic (H2 is always lowercase) we canonicalize case for certain known headers per table mentioned earlier and preserve case for unknown headers (well, the first, after that every ASCII case-insensitive match gets the same casing). The API will continue to return everything in lowercase.

Implementations are free to start implementing this behavior, changing the specification for this is not a high priority, though patches are always appreciated.

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