The way tools like GitHub or Phabricator do code review annotations is pretty good. My ideal annotation system would just be git with annotations based on a sel

The way tools like GitHub or Phabricator do code review annotations is pretty good. My ideal annotation system would just be git with annotations based on a selected range of words from the source document, stored in a standardized format within the git repo itself. Something like this has been done before using the 'notes' feature in git, however, notes lack some of the features and behaviors which would be desirable to make them more usable. Ideally notes should be able to take advantage of all of the benefits of git, such as being easily mirrored, forked, merged, etc...