Re: [streams] Implement readable stream teeing (b326a6e)

Yeah, @yutakahirano and I discussed this briefly in person in Tokyo. We think symmetry is important. For example for the non-byte-stream-case, the structured clone of `const r = new RegExp(); r.foo = "bar"` does not have a `foo` property.

For the byte stream case, especially a UA-generated byte stream where we know the Uint8Arrays don't have expandos or anything, we could optimize by only creating one clone and re-using the original. But that's an optimization.

I will add a note about this in the spec.

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