This was never resolved and the spec is incomplete here On Wed Sep 25 2013 at 6:17:32 PM, Allen Wirfs-Brock <[email protected]> wrote:
> So here is another concern, about the scheme we agreed to last week. > > It needs to match a found own property against the possibility of an own > @@unscopable property on the same object and that object may be somewhere > up the inheritance chain of the actual with object. The means that > [[HasProperty]]/[[Get]]/[[Set]] can not be used to do those resolve > binding in an ObjectEnvironmentRecord because they don't tell us where the > property was found. Instead, ObjectEnvironmentRecord needs to reimplement > its own property lookup using [[GetOwnProperty]] and [[GetInheritanceOf]]. > However, if the with object is a proxy that means we may be bypassing the > actual inheritance mechanism implemented by the Proxy's 'has'/'get'/'set' > traps and that could introduce observable semantics irregularities. > > Specifying the duplicated lookup is doable but a pain. That and the > semantic issues WRT proxies makes me a lot less comfortable with the added > complexity of supporting @@unscopable. > > Allen
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