Re: [whatwg/streams] Allow web devs to synchronize branches with tee()? (#1157)

All right, here's my attempt: https://jsfiddle.net/MattiasBuelens/9gr3zq7b/7/

It's basically a re-implementation of [ReadableStreamDefaultTee](https://streams.spec.whatwg.org/#abstract-opdef-readablestreamdefaulttee), but with a modified pull algorithm that waits until both branches have called `pull()` before proceeding with the actual `reader.read()`.

Here's how that would work in [your initial example](https://jsfiddle.net/jib1/Lb097t1m/6/): https://jsfiddle.net/MattiasBuelens/y439ahnp/2/

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