Comment #6 on issue 4289 by [email protected]: Array.prototype.concat's
[[Get]] of @@isConcatSpreadable fails when combined with cross-origin
security checks
https://code.google.com/p/v8/issues/detail?id=4289
Yup. Same issue as with @@toStringTag. For @@toStringTag we actually let
the exception propagate all the way. That meant that toString of a window
you could not access threw which was kind of bad.
I hope we can get away with treating all failed access checks (in all these
cases) as if the symbol wasn't there.
I'll email public-script-coord.
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