Any support for optimistic locking in CakePHP?

I'm just starting out with CakePHP, and I can't find any support for implementing an optimistic locking scheme. The closest I could find was a comment on this CakePHP blog post saying that it wasn't supported in June 2008.

Does anyone know if that has changed, or if someone has published an extension or a tutorial on how to implement it yourself?

For a description of optimistic locking, see this answer.