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

saschanaz created an issue (whatwg/webidl#1499)

### What is the issue with the Web IDL Standard?

https://webidl.spec.whatwg.org/#idl-operations

> and the argument is either the final argument or is followed only by [optional arguments](https://webidl.spec.whatwg.org/#dfn-optional-argument), then the argument must be specified as optional and have a default value provided.

But why such requirement? Web IDL doesn't have requirement that a required argument cannot follow an optional argument, that this is possible:

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

But because of that requirement we allow this too:

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

which is weird? One can say such function signature is weird too though.

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