Following up on a previous blog post about a JSON transformation issue, there is now a patched version of the json_pure 1.1.3 gem on GitHub. The issue had to do with transforming Hashes and Arrays to JSON when they contain objects (classes) that have their own to_json methods. A typical error message is:

lib/ruby/gems/1.8/gems/json_pure-1.1.3/lib/json/pure/generator.rb:251:in 
`to_json': wrong # of arguments(2 for 0) (ArgumentError)

See the README file and the commit history for generator.rb for more info. No warranties or guarantees that this will work for other users and uses of the json_pure gem! See the GPL license. Feedback is welcome!