Re: [whatwg/webidl] Should a no-required-member dictionary argument always be optional regardless of its position? (Issue #1499)

domenic left a comment (whatwg/webidl#1499)

I'm not sure I fully understand what you're proposing. But if I had to guess, you are saying that

```webidl
undefined operation(optional OptionalDict dict = {}, DOMString str);
```

is good (since it allows `obj.operation(undefined, "string")` to trigger the default. And

```webidl
undefined operation(OptionalDict dict, DOMString str);
```

is bad, since it prohibits `obj.operation(undefined, "string")` for no reason.

If that is what you are saying, I agree. We should require it to be optional regardless of the position.

I am curious if this affects any existing APIs.

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