extra.symfony.require is useful to lock dependencies to a LTS release, like 6.4.*:

• https://symfonycasts.com/screencast/symfony5-upgrade/flex-symfony-require#extra-symfony-require
• https://stackoverflow.com/questions/59166939/how-composer-extra-symfony-require-restriction-is-enforced

Yet it's mentioned only once in the doc about the bundles: https://symfony.com/doc/current/bundles/best_practices.html#require-a-specific-symfony-version

Is this feature still actively supported? Update: this parameter is added when running symfony new my_project_directory --version=lts so it looks like this feature is still supported.

Is it worth opening a PR to explain how to use it?