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What's does the Rector SymfonySetList::SYMFONY_54 constant mean?
SymfonySetList::SYMFONY_54
Tells Rector to add all the rules to upgrade your application up to Symfony 5.4 including rules of previous versions
Tells Rector to install Symfony 5.4 on your application
Tells Rector to add only the rules to upgrade your application to Symfony 5.4
