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

Rather than fix the implementation, they opted to subset the HTTP specification to fit the implementation of fetch().

Rule 33 of "The new Request(...) constructor steps are:" https://fetch.spec.whatwg.org/#dom-request


> If either init["body"] exists and is non-null or inputBody is non-null, and request’s method is `GET` or `HEAD`, then throw a TypeError. 

Which prevents doing clean call with complex nested structures like the fake code below.

```
const response = await fetch("/endpoint/search-something", {
    method: "GET",
    headers: {
        "Content-Type": "application/json"
    },
    body: JSON.stringify({
        foo: {
            bar: "qux",
            qux: {
                bar: "foo"
            }
        }
    })
});
```

If you wanted to make a proper API to handle front & back interactions, you can't.

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