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

> However, not sure how to tackle a future half-open. Should that first do the dictionary thing and then enumerate and ignore the keys already handled? That is, what semantics should web animations keep/get.

That's a great question. We basically have two options:

1. enumerate and copy, then pluck properties
2. pluck properties, then enumerate and copy, ignoring already-plucked properties

I really don't think it matters much. If I had to pick one I'd go for (1).

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