Re: [whatwg/streams] Piping to writable streams with HWM 0? (#1158)

Although adding such a mechanism might be useful, I want to make sure we've figured out the root issue here. In particular I worry that maybe we got the semantics of HWM wrong for WritableStream, if there's an expressive gap here.

But, I'm having a hard time articulating the expressive gap. Let's say we had a WritableStream with HWM = 0 that called `controller.releaseBackpressure()`. (When would it call it, exactly?) What is that WritableStream trying to express?

My best guess was something like "I currently have nothing in the queue, and I intend to consume whatever you give me ASAP, but please don't give me more than 1 chunk". But... that seems like the right semantics for HWM = 1. So I admit I'm confused.

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