Re: [whatwg/fetch] Fetch body streams are not full duplex (#1254)

> Regarding the effort required for implementation: it is very understandable that there are no resources to implement this now. My concern is that with the current spec wording there is also no way to implement it in the future, even if opinion on this matter changes. We are effectively locked into half-duplex for fetch forever. I think the specification should leave room for specifying this behaviour in the future - who knows what happens 5 years from now :-)

That's not really how specifications work (at least in the WHATWG). Implementations aren't prohibited from implementing things because the spec doesn't support them. Instead, implementations go ahead and implement ahead of or in parallel with spec work, and then bring their findings back to the spec for discussion. If there's multiple implementers interested in shipping something, then we change the spec, around the same time as it ships.

So I don't think you should be worried about the fact that the spec reflects implementations. That's working as intended. The spec can change, if resources to implement this free up.

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