Re: [heycam/webidl] Getting rid of optional (#905)

A late question:

```
void foo(boolean abc = false); // okay, `false` is a boolean
void foo(float abc = 1.0); // okay, 1.0 is a float, sure.

void foo(DOMString abc = undefined);
// well, is `undefined` a DOMString? 🤔
```

I'm also a bit worried that the implementation would be different while the syntax is similar: `DOMString bar = "str"` is always a string while `DOMString abc = undefined` is something like `Optional<DOMString>`.

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