# File lib/pry/helpers/command_helpers.rb, line 253
      def absolute_index_range(range_or_number, array_length)
        case range_or_number
        when Range
          a = absolute_index_number(range_or_number.begin, array_length)
          b = absolute_index_number(range_or_number.end, array_length)
        else
          a = b = absolute_index_number(range_or_number, array_length)
        end

        Range.new(a, b)
      end