In Symfony 4.1 you can define different paths per locale in routes without the need of installing a third-party bundle.
In Symfony 4.1 we've improved the Bootstrap 4 form theme with new features and we've made it fully accessible and compliant with WCAG 2.0.
Symfony 4.1 allows to define the priority of Twig extensions, which is useful when you need to overload the filters and functions defined in other extensions.
In Symfony 4.1, locks can be refreshed for a different amount of time than the original TTL used when creating the lock.
In Symfony 4.1 the AdvancedUserInterface has been deprecated, but you can define your own "user checkers" to get the same functionality.
In Symfony 4.1 the logic to redirect from URLs with trailing slashes to URLs without them finally works in both ways.
In Symfony 4.1, the commands passed to the process component can contain placeholders whose values are defined at runtime or obtained through environment variables.
In Symfony 4.1 you can configure the cost of hashing a password with the Argon2i algorithm thanks to three new options called memory_cost, time_cost and threads.
In Symfony 4.1, the bundle notation has been deprecated in favor of regular PHP namespaces.
Symfony 4.1 adds support for making 307 and 308 redirections, which are similar to 301 and 302 redirections but they don't allow changing the request method.