Re: [webidl] Allow constructor<ClassType> as a type accepted by functions. (#101)

If I were to guess what this means it would be doing something like an `IsConstructor(f)` check, plus a check that `f.__proto__ === Painter`. It doesn't check that the constructor is actually doing what you want, though: e.g. I could do `class X extends Painter { constructor() { return {}; } }` and all instances created by `X` would not be `Painter`s in any way.

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