Re: [whatwg/streams] Provide a way for the underlying sink to signal write progress? (#876)

This would mean changing the calculation of desiredSize from being directly based on the queue to being tracked separately. This seems reasonably achievable, but less elegant.

I'm concerned that callers who are looking at desiredSize to determine write size will end up doing tiny writes as they see desiredSize decrement by small amounts. This can be a well-known anti-pattern in networking: http://www.tcpipguide.com/free/t_TCPSillyWindowSyndromeandChangesTotheSlidingWindow.htm

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