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

> The specification complexity would be making that duplicate key check and then throwing?

Or whatever they want to do in the duplicate case.  @jyasskin is probably right that spec authors won't even realize they should handle it, so it probably does make sense to handle in IDL.  It just makes me a bit sad that ES proxies don't enforce this themselves per spec.  :(

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