Re: [whatwg/xhr] Web compat implications of making getAllResponseHeaders lowercase (#146)

> If you made the headers array TRULY case insensitive e.g. request.headers['Content-type'] request.headers['content-type'] request.headers['Content-Type'] request.headers['Content-tYpe'] all come back with the same value 

They do, if `request.headers` is a `Headers` object: they come back undefined.

I'm guessing that in your case `request.headers` is provided by some library that populates it based on `getAllResponseHeaders` and just stuffs whatever it gets from that API in there instead of defining `request.headers` such that it does case-insensitive lookups (which it could, if it really wanted to).

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