2.5 Cookies serializer

Applications created before Rails 4.1 uses Marshal to serialize cookie values into the signed and encrypted cookie jars. If you want to use the new JSON-based format in your application, you can add an initializer file with the following content:

Rails.application.config.action_dispatch.cookies_serializer = :hybrid

cookieのserializerがrubyのMarshalからJSONに変わったって部分。

これcookieがバージョンまたいでないと発生しないからテスト面倒だねえ・・・。

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