Re: [heycam/webidl] record with arbitrary value types as keys? (#509)

All in all, I see how this could be valuable. That said, I also agree with @domenic. The semantics of this proposal would be surprising. Record is basically an open-ended bag of properties. Limiting the keys to enum values (either by throwing or dropping them) would effectively turn it into a close-ended one, aka a dictionary.

I think we should close this for now and revisit if other similar uses cases pop up. Would that work for you?

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