[whatwg/fetch] Request with GET/HEAD method cannot have body. (#551)

I ran into this restriction while building HTTP functions for a library. I think this should be reconsidered because sometimes people actually use the body in a GET request. Notably, ElasticSearch can use it for queries. It can use the querystring instead, but that can be pretty cumbersome which is why it also accepts a body for GET queries.
https://www.elastic.co/guide/en/elasticsearch/reference/current/search-request-body.html

Since I'm making a library I want to allow everything within the specification of HTTP but apparently fetch has its own rules, and as you can see it's possible for that to interfere with using an API.

You'd think this is an edge case, but if it interferes with something like ElasticSearch maybe it's not an edge case.

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