Re: [heycam/webidl] A non-optional dictionary argument makes sense at times. (#130)

There's also the getUserMedia case. In none of the cases do I think it would be a simplification in spec prose, since the steps that cause TypeError to be thrown still have to be there. However, in all three cases the specs initially didn't use optional, so at the very least what Web IDL requires isn't what spec authors are born believing.

I think downgrading to a "should" would be fine, but cases where the `.length` property is already the same everywhere are probably best left alone still.

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