Re: [heycam/webidl] Add typed ReadableStream<type> and WritableStream<type> (#951)

I'm -1 on this, as comments (i.e. things which don't impact the binding generation) are best done as actual comments. You can write

```
readonly attribute ReadableStream /* of ReceiveStream */ incomingUnidirectionalStreams;
```

or similar if you'd prefer brevity.

In particular, the problem here is that you could write `ReadableStream<bool>` in your IDL, or `ReadableStream<ReceiveStream>`; it wouldn't matter. There's nothing in the spec infrastructure, or implementation infrastructure, to enforce that your `ReadableStream` contains a given type.

We're actually discussing perhaps removing the `<T>` syntax for promises as well, since we've discovered that implementations don't seem to do anything with it: see #943 and #782.

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