# File lib/rhc/highline_extensions.rb, line 333
    def source_rows
      @source_rows ||= begin
        (@mapper ? (items.map &@mapper) : items).each do |row|
          row.map! do |col|
            case col
            when Array then col.join("\n")
            when String then col
            else col.to_s
            end
          end
        end
      end
    end