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

Yeah, that's also what I was thinking. If we consider HWM = 0 to be broken, we could special case it. I *think* we would only need to change a single abstract op:

> WritableStreamDefaultControllerGetBackpressure(*controller*) performs the following steps:
>
> 1. Let *desiredSize* be ! WritableStreamDefaultControllerGetDesiredSize(*controller*).
> 2. If *controller*.\[[strategyHWM]] is 0,
>     1. Return true if *desiredSize* < 0, or false otherwise.
>         (This is effectively the same as checking if *controller*.\[[queueTotalSize]] > 0.)
> 3. Otherwise,
>     1. Return true if *desiredSize* ≤ 0, or false otherwise.

Alternatively, if want zero-size chunks to *also* cause backpressure, we could change it to "if *controller*.\[[stream]].\[[writeRequests]] is not empty" or something.

Still, not sure how I feel about this. Might be difficult to explain this behavior to developers. 🤷‍♂️

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