Re: [heycam/webidl] Define [[OwnPropertyKeys]] of legacy platform objects (#402)

First of all, this PR is awesome.

Second, I am concerned about the extent to which it matches implementations, especially with regard to ordering. In particular, it's possible implementations don't have a good order except in enumeration cases, if they don't map onto the recent ES spec updates which derive enumeration from own property keys.

So, we'll need some good tests of the various permutations here to be sure.

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