I want to report a bug/anomaly in Git

Hi, how do I report a bug/anomaly in git? I have looked on the git website and tried to ask on the git irc on freenode but couldn't post, even after requesting a 'voice'. The bug is that if you happen to create a new remote branch which shares it's name with an existing directory in the top level of the git repository, git then seems to get confused and the: git checkout <branch> - command doesn't switch to that branch or turn tracking on (and seems to think it was created from origin/<branch> rather than from refs/remotes/origin/<branch>), which it does if the branch doesn't share a name with an existing top level directory. This can be rectified by running: git checkout --track -b debian origin/debian - but this confused me for several hours and it was only because I had another repository with the same branch names, but different top level directories where the command worked that it finally dawned on me what the problem was. I then deleted the branch and created a new one with a differnt name and everything worked as expected.