Improve performance of get() for negative indices. Fixes #5476. #102
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Check the bug ticket for discussion and a performance test.
This commit also fixes an inconsistency in the return values of
get()e.g.bar
$("#foo").get(0) //yields the element
$("#foo").get(1) //yields undefined
$("#foo").get(-1); //yields the element
$("#foo").get(-2); //still yields the element #foo instead of undefined
//new version return undefined for the last use case