rest parameters

[Michaël Rouges]

For the undefined case, it isn't unexistent...

```JavaScript
void function () {
     console.log(arguments.length); // 3
}(1, 2, undefined);
```

Then, I don't see how it may be ambiguous...


Michaël Rouges - https://github.com/Lcfvs - @Lcfvs
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