Re: [whatwg/webidl] Allow dictionaries and callbacks to be distinguishable (Issue #1191)

I suspect this change could be made in a web-compatible way, but FWIW you could technically use a callback function as a dictionary, since functions are objects.

```
let silly = Object.assign(e => {}, {once: true});
document.body.addEventListener('click', silly, silly);
```

Probably just making these distinguishable and keeping the current logic whereby the IsCallable check happens before the dictionary conversion.

As a consistency point, EventTarget/addEventListener looks more like your second example -- but I don't think that pattern is ubiquitous.

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