[whatwg/streams] Does pipeTo() wait for writes to complete even when there are no writes? (#945)

https://streams.spec.whatwg.org/commit-snapshots/51227372cc84846bdcf68312724c4cac6a4b9e58/#rs-pipeTo-shutdown-with-action

> Wait until every chunk that has been read has been written

I think it's ambiguous whether this waits when no chunks have been read or not. This is visible because the behaviour of a pipeTo() that starts when one or both sides is closed or errored is tightly specified, and because waiting is detectable via microtask execution.

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