Re: [heycam/webidl] Async constructors? (`new Foo()` returning Promise<Foo>) (#563)

While `await new` does look pretty clean if nonidiomatic, using `.then` and `.catch` looks a bit odd:

```js
return new StyleSheet(text).then(actualSheet => actualSheet.doSomethingElse());
```

In general I would prefer preserving the `new` keyword to what's already there rather than introducing something new into the platform. I would not be surprised at all to find style guides out there that expressly prohibit `return`ing from a constructor – and in fact I would suggest the same to most JavaScript programmers.

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