Re: [whatwg/streams] can streams be transferred via postMessage()? (#276)

Okey so chrome and opera have made this possible already.
...I'm already using this in my StreamSaver lib and encounter an bug (i think?)

I'm transferring a readableStream out of a TransformStream on the main thread -> passing the readableStream to a other window -> and that window forwards that readableStream to the service worker

once that is done i terminate the 2nd window by closing/removing it and then the stream gets closed or something. i'm not sure if it's a bug or if it's something that isn't spec:ed. 

The main thread should still be able to write to the readableStream that has been forwarded to another context?

for a more deeper understanding i can refer you to my issue: https://github.com/jimmywarting/StreamSaver.js/issues/94

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