[whatwg/fetch] Question regarding headers (#1020)

Hi,

Should fetch clients lowercase headers or just leave them untouched? It looks like [lowercasing header names was removed in 2017](https://github.com/whatwg/fetch/pull/476). However, [RFC 7540](https://tools.ietf.org/html/rfc7540#section-8.1.2) states: 
> (...) header field names MUST be converted to lowercase prior to their encoding in HTTP/2.

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