Re: [heycam/webidl] Need pattern for feature detecting dictionary members (#107)

Random idea on my bed: constructors for dictionaries

```webidl
dictionary Foo {
  (DOMString or boolean) bar;
} ;
// implicitly creates an interface-like constructor
```

```js
"bar" in Foo.prototype // typical existence check
new Foo({ bar: "bar" }).bar === "bar" // type support check; string in this case
```

Problem: massive namespace pollution 🤔

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