First off, apologies for not posting this in Unity Answers. That appears to be broken. I tried to post this there, but it refused to let me do so until I added tags. It didn't make any tag suggestions to me (like StackOverflow does), so I just tried entering List, Vector3, and Collection. It then informed me that none of those tags exist and that I can't create new tags because I don't have enough rep, but I can't get any rep because I can't do anything without posting a question. So basically...
Boo Lists - Cast to (UnityEngine.Vector3)?
Boo Lists - Cast to (UnityEngine.Vector3)?