Updates:
Status: WorkingAsIntended
Comment #1 on issue 239 by [email protected]: v8 implementation of
[Array.prototype.lastIndexOf] handling [Undefined] types in comparison to
mozillas current JavaScript version
http://code.google.com/p/v8/issues/detail?id=239
This is working as intended. The lastIndexOf function should only consider
elements
that are present in the array. Elided elements are not in the array:
2 in [2,3, ,4,5,6]; // false
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