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

So that's true even for piping? I.e. if I do

```javascript
var writable = nativeFileSystemAPI.appendToFile(filename);
writable.write = function(buffer) {
  console.log(buffer);
  WritableStream.prototype.write.call(this, buffer);
}
readable.pipeTo(writable);
```

Then nothing will get logged since `pipeTo` is reaching into the innards of the argument that's passed to it, rather than using the public API?

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