Re: [heycam/webidl] Sort out when dictionaries and records should have default values (#76)

We can certainly forbid it.   I'm not sure when the ability to add non-trailing optional arguments was added.  https://www.w3.org/Bugs/Public/show_bug.cgi?id=10336 was asking for it but was wontfixed.  None of the other issues or bugzilla tickets seem obviously relevant, and digging through blame with all the mass-reformattings is hard... I can do it if really needed, though; I suspect it's blame on the overload resolution algorithm and its handling of `undefined` that matters here.  It might be helpful to understand what the use cases were for non-trailing optionals to decide what to do with dictionaries that fit that description.

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