In reply to line 44 of blivet/mounts.py: Can not always rely on it being a str AFAICT from examining related BTRFS code. -- To view this comment on github, visit https://github.com/mulkieran/blivet/commit/b1ba23ce9a3fa1651e55c237b0af9b8b6498813c#commitcomment-11064643