Comment #8 on issue 4317 by [email protected]: @@isConcatSpreadable is
ignored by Array.prototype.concat when the arguments are arrays
https://code.google.com/p/v8/issues/detail?id=4317
I tried removing the builtin, and the bug was fixed. See the patch in
https://codereview.chromium.org/1247243003 . I just need to see if this
hurts performance. I suspect maybe not, as %ArrayConcat is already pretty
fast-looking.
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