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

I just ran into this lowercasing behavior and it is preventing me from consuming a third-party API that expects capital letters for headers.  If I explicitly set my headers to capital case for a fetch request, I would expect that it is sent to the server as such.  I have no control over the third-party API, and I am sad that I will have to abandon the fetch polyfill as it is making an assumption that all servers match headers against lowercase or that they normalize casing.  Not all APIs are optimal.

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