Haskell serialization library with version control - GHC libraries

 SafeCopy is an extension to cereal, a Haskell serialization library:
 it adds the ability to define new versions of some data tpe and
 automatically convert variables serialized with an old format to a
 newer one.
 .
 This package provides a library for the Haskell programming language.
 See http://www.haskell.org/ for more information on Haskell.