### Fixed - Fixes [#3978](https://github.com/Alamofire/Alamofire/pull/3978), a rare logical race that allowed the same response serializer to execute multiple times simultaneously, which would call the completion handler multiple times, leading to crashes when wrapping continuations. - Fixed by [Jon Shier](https://github.com/jshier) in Pull Request [#3999](https://github.com/Alamofire/Alamofire/pull/3999).