symfony/symfony-docs — pull request #3645 by stof (2014-03-06 16:09:49+00:00)
Title: Adjusted the BC rules to be consistent

A previous rule states that we guarantee BC for code extending the class. This rules does not allow marking a class as final as it would be a fatal error for extending code after the upgrade, which is far from being BC.

/cc @fabpot @bschussek