def grace_period=(mins)
      mins = JSS::Validate.integer(mins)
      mins = 0 if mins.negative?
      return if mins == grace_period
      @grace_period = mins
      @need_to_update = true
    end
def grace_period=(mins)
      mins = JSS::Validate.integer(mins)
      mins = 0 if mins.negative?
      return if mins == grace_period
      @grace_period = mins
      @need_to_update = true
    end
see attr_reader :grace_period