* 3.4:
[HttpFoundation] refactoring: calculate when need
[Serializer] Fix extra attributes when no group specified
[Intl] Make intl-data tests pass and save language aliases again
[FrameworkBundle][Config] fix: do not add resource checkers for debug=false
[DI] Fix "almost-circular" dependencies handling
[Console] Fix CommandTester::setInputs() docblock
Only enabling validation if it is present
Fix displaying errors for bootstrap 4
[Serializer] readd default argument value
Fix reference dump for deprecated nodes
[PhpUnitBridge] Fixed fatal error in CoverageListener when something goes wrong in Test::setUpBeforeClass
[HttpKernel] Let the storage manage the session starts
[VarDumper] fix trailling comma when dumping an exception
[Validator] Fix TraceableValidator is reset on data collector instantiation
Remove useless docblocks
[FrameworkBundle] Fix docblocks
[PropertyInfo] Remove useless docblocks
