ruby: range with custom class

range.rb

class Ln
  include Comparable
  attr_reader :value
  
  def initialize(n)
    @current = n
    @value = Math.log2(n)
  end
  
  # Objects of the range have to comparable
  def <=>(another)
    value <=> another.value
  end
  
  # For methods, which treat Range as sequence
  # method, which gives next values has to be implemented
  def succ
    Ln.new(@current+1)
  end
end

first = Ln.new(16)
second = Ln.new(64)

first..second # range based on Ln class