Re: [whatwg/streams] Add WritableStreamDefaultController.releaseBackpressure() (PR #1190)

Hmm, good point. We don't know if or when `transform()` will call `enqueue()`. It might do it synchronously (e.g. for an identity transform or for `TextDecoderStream`), in which case buffering doesn't help and writable HWM = 0 would make more sense. But we cannot assume that. 🤔

If we don't change the default, we should document how authors can construct an unbuffered transform stream, and when they should use this. We should also go through other specifications that use `TransformStream` and check if they should have writable HWM 0 or 1.

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