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

So basically if you're doing a sync transform, you should use HWM = 0, but an async transform should use HWM = 1 (or higher)? That's rough for web developers. I guess the conservative default is to stick with 1 and tell people to customize for sync transforms...

Maybe we could make it better in the future with something like `TransformStream.fromSyncMap(x => y)`, but I dunno, then you might want to have flush logic...

> Alternative names I've thought of

I like `markReady()` since the `ready` promise is the existing developer-facing manifestation of backpressure. I agree it's hard to communicate the conditional nature of the API, without a long name.

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