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

Having the custom `tee()` invoked on `clone()`, but not on the clones used for redirect might be necessary, yes.  The important point that @annevk raises is that we might get the performance gain in the places where it is safe (calling `clone()` on a `Request` or `Response`) but we have a separate choice to make about how to deal with the internal cloning needs.

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