`super` and superclass constructor return values

[Isiah Meadows]

What should `this` be in class `B`? The value of `object` or an instance of
`B`? It's an edge case, but could simplify my code a little if it's the
former.

```js
const object = {}

class A {
  constructor() {
    return object
  }
}

class B extends A {
  constructor() {
    super()
    console.log(this === object)
  }
}
```
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