fails:Array#rindex returns the first index backwards from the end where element == to object
fails:Array#rindex returns size-1 if last element == to object
fails:Array#rindex returns 0 if only first element == to object
fails:Array#rindex returns nil if no element == to object
fails:Array#rindex returns correct index even after delete_at
fails:Array#rindex properly handles empty recursive arrays
fails:Array#rindex properly handles recursive arrays
fails:Array#rindex accepts a block instead of an argument
fails:Array#rindex ignores the block if there is an argument
fails:Array#rindex rechecks the array size during iteration
fails:Array#rindex given no argument and no block produces an Enumerator
