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

If we want to eventually support fixed length content for streams like this it might be nice to let the stream specialize for it.  The internal source could provide a "total length" getter that the stream can then expose.  So things like file streams and fixed-string streams could then expose their total length.  Fetch could then just DTRT if the total length is available.

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