airblade/paper_trail — pull request #180 by TylerRick (2012-11-05 19:21:20+00:00)
Title: When building the :object_changes metadata, use the serialized value for any attributes that are serialized

This way, we store the *same* (serialized) representation of an attribute in object_changes that ActiveRecord itself uses when it stores the attribute value in the model's table.