Is this library still necessary?

[RinkAttendant6]

With the changes in symfony/psr-http-message-bridge#89, does this library provide additional or different functionalities than those added in the Symfony one?

[ajgarlag]

It provides an upgrade path documented in the README file. What kind of additional functionality do you expect?

[RinkAttendant6]

I'm not expecting any additional functionalities, but what is the difference between using this library to upgrade compared to using symfony/psr-http-message-bridge >= 2.1 ?