Re: [whatwg/streams] pipeTo(): the stream queues should be used (#653)

> An implementation of pipeTo() that doesn't make use of the queues in the streams is compliant with the standard.

Is this because we never explicitly state you must use (the equivalent of) WritableStreamDefaultWriterWrite/the counterpart reader methods? But aren't the "backpressure must be enforced" requirements effective in enforcing this? Or is the issue that, since we don't use WritableStreamDefaultWriterWrite, an implementation might directly "write" by sending to the underlying sink?

I guess we should state what we mean by "write" then. Although, we also want to allow room for optimization, e.g. bypassing the queue in the case of bypassing intermediate identity transforms or similar... Not sure what to do here.


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