Re: [heycam/webidl] [[Set]] algorithm for legacy platform objects does not seem to be compatible with the Storage interface (#366)

I'm not sure I follow exactly what steps you take to there. Is the crux of argument in [[DefineOwnProperty]]'s step 2.2:

"If O implements an interface with the [OverrideBuiltins] extended attribute or O does not have an own property named P, then:"

Where, in second call to Object.defineProperty in your example, neither of the conditions in this clause hold? (e.g. it is not [OverrideBuiltins] and O **does** have an own property named P).  

Since the "have an own property" part is not linked to a specific algorithm, I took that to mean (now I feel foolish for this interpretation) that meant non-named getter properties. And that is why if you look at a ToT WebKit, it will have the same result as the other browsers.

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