Re: [streams] Custom tee function (#401)

This complicates pipeTo optimization. When an IdentityTransformStream (Pipe) is involved, we need to propagate the tee() signal to ask the first data producer in the pipeTo chain, and have all the members in the chain convey data flow for both slow and fast consumer. Needs careful investigation.

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https://github.com/whatwg/streams/issues/401#issuecomment-151318361