lib/to_xls.rb in to_xls-0.1.1 vs lib/to_xls.rb in to_xls-0.1.2

@@ -17,10 +17,10 @@
       if columns.any?
         line = 0
         
         unless options[:headers] == false
           if options[:headers].is_a?(Array)
-            sheet.row(0).concat options[:headers]
+            sheet.row(0).concat options[:headers].collect(&:to_s)
           else
             aux_headers_to_xls(self.first, columns, sheet.row(0))
           end
           line = 1
         end