def padded_rows
      rows = @rows.map do |row|
        CSV::Row.new(row.cells.keys, row.cells.values)
      end

      table = CSV::Table.new(rows)
      table.values_at(*@header.columns)
    end
def padded_rows
      rows = @rows.map do |row|
        CSV::Row.new(row.cells.keys, row.cells.values)
      end

      table = CSV::Table.new(rows)
      table.values_at(*@header.columns)
    end
Internal: make use of `CSV#values_at` to pad out the
 cells into the correct columns for the headers

 Returns an Array of Arrays