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

FWIW, in WebKit, the internal headers structure makes a difference between common/precompiled header names and less frequent header names.
I don't think WebKit is able to keep casing information for common header names.
The list of common headers is available at https://github.com/WebKit/webkit/blob/master/Source/WebCore/platform/network/HTTPHeaderNames.in
I understand the compat issue, but I also like the idea of making aware applications that they should move to case-insensitive header processing. 


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