[extension]

How about adding this to the Point class?

  def to_hash
    {:x => @x, :y => @y}
  end
  
  def to_ary
    [@x,@y]
  end

  def [] i
    case i
    when 0,:x
      @x
    when 1,:y
      @y
    end
  end

Should work if the receiving method interprets the arguments properly.