Re: [whatwg/fetch] Streams based uploading with Content-Length (not chunked encoding) (#95)

Making such restrictions (or forbidding it from being set more than once) are actually somewhat tricky given that all the APIs are generic. I wonder if a nicer alternative could be wrapping a ReadableStream somehow: `{ stream, length: 123 }`. That way we have typed data from the start and then the fetch algorithm can just use it to set the header correctly.

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