Re: [streams] First draft at tee algorithms, for critique (#302)

Hmm, yeah. I think those are good principles. They point me to both-cancels-fulfill or both-cancels-reject. Since both-cancels-fulfill loses information, I think that means we want both-cancels-reject.

Although, even one-fulfills-one-rejects wouldn't necessarily violate any of those constraints. It would tell you whether you were the _first to cancel_, but not whether you were the "left" side of the tee or the right side. But, even that is a kind of information leakage between the two branches, so yeah, let's not do that.

(BTW my mismatched .then + .catch was not intentional, both should be .then)

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