Symfony version(s) affected: 4.3.0

Description

Prior to 4.3.0, test.client used to be an instance of Symfony\Bundle\FrameworkBundle\Client.
In 4.3.0, it becomes Symfony\Bundle\FrameworkBundle\KernelBrowser which does not extend Symfony\Bundle\FrameworkBundle\Client anymore.

Because of the lack of interfaces, there was no other possibility to typehint it than to use the class name.

I saw Symfony\Component\BrowserKit\Client has been deprecated but it's still used, is it possible to do the same with FrameworkBundle's Client?