Session data disappearing on redirect

[eluser]pornnarnold[/eluser]
I've been playing around with this and I've found that the cookie is being set and I can see the stored 'serialized' test data in the cookie array.
It is still not being returned by the session->userdata() function though.

Interestingly, if I print_r $this->session->all_userdata(), it tells me that the user_agent is "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) App". When I dump the $_SERVER array, my http_user_agent is "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/534.30 (KHTML, like Gecko) Chrome/12.0.742.112 Safari/534.30".
So the user_agent part of the session data is being truncated.

Does anyone know if this is a feature of the session library or an error?

Edit: Looking through the session library, it does indeed limit the user_agent to 50 characters