def loop_once
    return super if SqueezeHistory.disabled?
    begin
      input, last_input = history[-1], history[-2]
    rescue IndexError # EditLine is really broken, to_a is needed for it
      array = history.to_a
      input, last_input = array[-1], array[-2]
    end
    history.pop if input.to_s.strip == '' ||
                  (history.size > 1 && input == last_input)
    super
  end
def loop_once
    return super if SqueezeHistory.disabled?
    begin
      input, last_input = history[-1], history[-2]
    rescue IndexError # EditLine is really broken, to_a is needed for it
      array = history.to_a
      input, last_input = array[-1], array[-2]
    end
    history.pop if input.to_s.strip == '' ||
                  (history.size > 1 && input == last_input)
    super
  end
--------------- Rib API ---------------
 squeeze history in memory too