fix: remove deep_symbolize_keys

lib/tallty_import_export/export.rb

@@ -106,7 +106,7 @@ module TalltyImportExport
       title1 = workbook.styles.add_style(alignment: alignment, border: border, sz: 12, b: true)
       title2 = workbook.styles.add_style(alignment: alignment, border: border, bg_color: '2a5caa', sz: 12, fg_color: 'fffffb')
       title3 = workbook.styles.add_style(alignment: alignment.merge(wrap_text: true), border: border, sz: 10)
-      headers = (export_headers || export_headers_result(**options)).deep_symbolize_keys
+      headers = export_headers || export_headers_result(**options)
 
       _sheet_name = respond_to?(:sheet_name) ? sheet_name : nil
       _sheet_name ||= sheet_name
@@ -308,6 +308,7 @@ module TalltyImportExport
 
     def handle_select(data, header, **opts)
       if header[:select].present?
+Rails.logger.info "handle_select: #{header}#{data}"
         select_option = header[:select].find { |option| option[:value].to_s == data.to_s }
         select_option.present? ? select_option[:label] : data
       else