fails:Array#values_at returns an array of elements at the indexes when passed indexes
fails:Array#values_at calls to_int on its indices
fails:Array#values_at properly handles recursive arrays
fails:Array#values_at does not return subclass instance on Array subclasses
fails:Array#values_at when passed ranges returns an array of elements in the ranges
fails:Array#values_at when passed ranges calls to_int on arguments of ranges
fails:Array#values_at when passed a range fills with nil if the index is out of the range
fails:Array#values_at when passed a range on an empty array fills with nils if the index is out of the range
