To be merged or rejected:
symfony/symfony#14900 Fixing Deprecation Warningssymfony/symfony#14887 Swap new ChoiceView constructor arguments to ease migrating from the deprecated onesymfony/symfony#14883 Improved exception message if custom implementation of OptionsResolverInterface is usedsymfony/symfony#14835 [DependencyInjection] Fixed resolving of service configurators containing Definition objectssymfony/symfony#14825 Documenting how to keep option value BC