Re: [whatwg/streams] Proposal: ReadableStream tee() backpressure (Issue #1235)

In #1233 I also reported the issue that `ReadableStream.tee()` only partially signals backpressure, from the *faster* branch to the source, while leaving the slower branch accumulate unlimited data on its queue. Why not add an option `tee({fullBackpressure: true})` that fixes the implementation of `tee` and returns two readers that correctly signal backpressure from the *slower* branch to the source `ReadableStream`? Then you could do anything you want with the branches such as calling `pipeTo`, which is harder to do if you can only create nonexclusive `ReadableStreamDefaultReader`/`ReadableStreamBYOBReader`s.

In one way, your proposal is more flexible in that you can dynamically add and remove non-exclusive readers, but is that really what you want?

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