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

Currently, `XMLHttpRequest` is not going anywhere and `fetch` is a new API, so there is no need for it to be backward compatible.
Old and unmaintained code usually means that it is not an active third party API, so I am not sure this is relevant here.
If you have internal old and unmaintained code, I do not have a good advise other than to use `XMLHttpRequest` or use a server to proxy your requests instead.

The whole point of a new API is that it does not need to be "compatible" with anything in that sense.

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