fix excel pagination

lib/tallty_import_export/excel.rb

@@ -69,9 +69,9 @@ module TalltyImportExport
 
       def initialize ary, page: ,per_page:
         @raw_ary = ary
-        @current_page = page
+        @current_page = page.to_i
         @total_pages = (@raw_ary.count / per_page.to_f).ceil
-        parsed_ary = @raw_ary[(page - 1) * per_page ... (page) * per_page]
+        parsed_ary = @raw_ary[(page.to_i - 1) * per_page.to_i ... (page.to_i) * per_page.to_i]
         super(parsed_ary)
       end
 

spec/excel_spec.rb

@@ -8,7 +8,7 @@ RSpec.describe TalltyImportExport::Excel do
   end
 
   it 'Excel::Pagination' do
-    pagination = TalltyImportExport::Excel::Pagination.new([1,2,3,4,5,6], page: 2, per_page: 2)
+    pagination = TalltyImportExport::Excel::Pagination.new([1,2,3,4,5,6], page: '2', per_page: '2')
     expect(pagination.count).to eq(6)
     expect(pagination.current_page).to eq(2)
     expect(pagination.total_pages).to eq(3)