fails:Array#+ concatenates two arrays
fails:Array#+ tries to convert the passed argument to an Array using #to_ary
fails:Array#+ does return subclass instances with Array subclasses
fails:Array#+ does not call to_ary on array subclasses
fails:Array#+ does not get infected even if an original array is tainted
fails:Array#+ does not infected even if an original array is untrusted
