def fill(*args, &block)
      ary = self.to_a
      ary.fill *args, &block
      self.replace ary
    end
def fill(*args, &block)
      ary = self.to_a
      ary.fill *args, &block
      self.replace ary
    end
Validates outcome. See Array#eql?
 Validates outcome. See Array#fill