rails/rails — pull request #7348 by bgipsy (2012-08-14 12:03:05+00:00)
Title: Format errors should not crash MessageVerifier

It seems logical to treat incompatibly marshaled data the same way as unsigned. This would fix issues like #2509 when class signature changes or serializer gets replaced. Motivation for changing session secret hash should not be connected to changes in implementation details of flash or session serialization.