fails:Array#[]= sets elements in the range arguments when passed ranges
fails:Array#[]= does nothing if the section defined by range has negative width and the rhs is an empty array
fails:Array#[]= tries to convert Range elements to Integers using #to_int with [m..n] and [m...n]
fails:Array#[]= calls to_ary on its rhs argument for multi-element sets
fails:Array#[]= with [m..n] replaces the section if m < 0 and n > 0
fails:Array#[]= with [m..n] inserts the other section at m if m > n
fails:Array#[]= with [m..n] accepts Range subclasses
