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

It occurs to me that it might be a bit strange that for author-created duplex streams, the syntax is

```js
destination.postMessage(duplex, { transfer: [duplex.readable, duplex.writable] });
```

whereas for transform streams it is

```
destination.postMessage(transform, { transfer: [transform] });
```

I can't think of any nice solution for this though. Unfortunately the structured-serialize algorithm will throw for any platform object not explicitly marked as serializable (like a `TransformStream`), so to make the former syntax work for them we'd need make them `[Serializable]`. But that doesn't seem doable in general. It'd require new infrastructure in the structured clone algorithm I guess, which is probably not worth it.

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