Re: [heycam/webidl] Specify open dictionaries. (#180)

Headers currently supports explicitly repeated headers via the `sequence<sequence<ByteString>>` thing.  Which means you can already hand it any iterator you want and it will do the right thing with it.  The question is whether it makes sense to have a thing where input objects and maps get auto-coerced into iterators.  For Headers this seems totally fine.  What I'm less clear on is other use cases.

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