Comment #5 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
this is (I think) the same problem we had when @@toStringTag was shipped
before, re: problems wrt `toString.call(someOtherOriginObject)`, so it
applies to a lot of the well-known symbols (and all of the
Get(x, "constructor")` lines in the spec (for Promise, @@Species, etc).
Lots of cases where you could potentially run into code that throws for
objects from a cross-origin realm.
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