def include_none?(*items)
      items = items.first if items.length == 1 && items.first.kind_of?(Array)
      (self & items).empty?
    end
def include_none?(*items)
      items = items.first if items.length == 1 && items.first.kind_of?(Array)
      (self & items).empty?
    end
Returns whether the Array contains none of the items.

   [1, 2, 3].include_none?(1, 2)  #=> false
   [1, 2, 3].include_none?(1, 4)  #=> false
   [1, 2, 3].include_none?(4, 5)  #=> true