Unable to insert YAML into t.text field (behavior different from Ruby 1.8.6)

When attempting to insert information into a text field within the mysql database, ActiveRecord raises an exception stating:

TypeError (wrong argument type String (expected YAML::JvYAML::Node))

When running under Ruby 1.8.6, the operation that generates this error succeeds without problem.

I have attached a program that generates this error. To generate the exception follow these instructions.

1) Unpack the project to a folder on your test machine. Edit the username/password in the database.yml file appropriately.

2) Create the development database using "rake db:create"

3) Install the database using "rake goldberg:install"

4) Launch the application using "script/server" or similar

5) Login to the application as administrator (admin/admin)

6) Use the menu in the left column to navigate to "Administration -> Setup -> Roles"

7) Select the Administrator role

8) Scroll down and hit the "Edit" link

9) Change the name to "Superuser"

10) Click on the "Edit" button.