Re: [whatwg/streams] Handeling backpressure on the Readable side of a transform stream (Issue #1323)

jedwards1211 left a comment (whatwg/streams#1323)

@MattiasBuelens I wonder if I'm missing something here...

In a `ReadableStream` we can handle backpressure by limiting the amount of data we enqueue in `pull()` according to `controller.desiredSize`.

But it seems like in a `TransformStream` we can't really put `controller.desiredSize` to good use.  Our `transform()` could limit the amount of data it enqueues, but any of the remaining data from the input chunk would just be lost.

So can we make any reasonable decisions with `TransformStreamDefaultController.desiredSize`?

Theoretically, there should be a clean way to implement a `TransformStream` where given an input chunk `{ n: 483 }`, it enqueues 483 output chunks, respecting backpressure.  But it seems impossible to do something like that within the API's current limitations. 

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