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

> But we don't use the `optional` keyword for that---because it's redundant with the default value.

Currently we do use `optional` keyword for every optional argument, and specifying a default value without `optional` is a syntax error.

```
ArgumentRest ::
    optional TypeWithExtendedAttributes ArgumentName Default
    Type Ellipsis ArgumentName
```

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