Takeshi Yoshino

> I'm not sure if that was your plan in this PR or if you were just using the .js code as a way to organize the thoughts. Yeah, initially...

> we would add an unobservable brand check and fast path I see. Anyway we need to perform some special interaction with the streams to realize the optimization. Even the...

To be clear, I'm not saying the above is elegant. Exploring if there's any simple solution.

Yeah, sounds fine. https://streams.spec.whatwg.org/#readable-byte-stream-controller-get-desired-size https://streams.spec.whatwg.org/#readable-stream-default-controller-get-desired-size

We've decided to introduce isDisturbed, not byte counting system. So, we should reinvestigate how we set isDisturbed.

Regarding how we realize postMessage()-ing streams https://github.com/whatwg/streams/issues/244, we should consider how to deal with invocation of an optimized pipeTo() logic for cross thread case.

Please take a look at my strawman API for allowing pipeTo optimization at #511.

+1 for removal of the fallback

Thinking of real use case, for example, if the sink is network and the WritableStream to the sink accepts ArrayBuffers. We can make the sink accept also an array of...

@domenic Right. I'm not against cork/uncork. Just tried to look for alternative. Have you considered adding one method say `control` that accepts a string (or structured data?) to send some...