<< (FasterCSV::Row)

    # File lib/faster_csv.rb, line 217
        def <<(arg)
          if arg.is_a?(Array) and arg.size == 2  # appending a header and name
            @row << arg
          elsif arg.is_a?(Hash)                  # append header and name pairs
            arg.each { |pair| @row << pair }
          else                                   # append field value
            @row << [nil, arg]
          end

          self  # for chaining
        end