Sadly, in the dark ages before the new release system was deployed on drupal.org, issues were filed against a moving target "cvs" version of the Drupal core project. Some of these issues are many years old from the the 4.2.x days. Others were created 2006-11-10 for the 5.0-beta-x releases. The thing is, we just don't know. In the future, we'll never face this problem again, since the "HEAD" will always have a reasonable name like "5.x-dev" or "6.x-dev".