Did the format of config['rb_base_dir'] change?

I recently updated a site to 0.9.6.2 and I found that some of my snippets were not working anymore. I finally seem to have found the problem. The config[’rb_base_dir’] setting only contains a part of the whole path. I am pretty sure it used to be the whole path (I even had code to strip that part).

Example:
old: /home/httpd/vhosts/domainname.ext/httpdocs/bestanden/
new: /bestanden/

Is this expected? I could not find anything about it in the changelog.

My current fix is to concatenate base_path and rb_base_dir which seems to do the job, but not sure if it is the "correct" way.