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

TimothyGu commented on this pull request.



> @@ -12014,19 +12014,26 @@ However, for [=legacy platform objects=],
 properties on the object must be
 enumerated in the following order:
 
-1.  If the object [=support indexed properties|supports indexed properties=], then
-    the object’s [=supported property indices=] are
-    enumerated first, in numerical order.
-1.  If the object [=support named properties|supports named properties=] and doesn't implement an [=interface=] with the
-    [{{LegacyUnenumerableNamedProperties}}]

Yes, `LegacyUnenumerableNamedProperties` controls the `enumerable` bit in the descriptor but not the existence of the key. See [[GetOwnProperty]]. The original pseudo-algorithm defines the "enumeration order", basically the order of for-in loops, which accounts for both enumerability and key existence.

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