Comment by rakoo

I don't have an example of a refactoring, but the git data model [0] is extaordinarily simple, to the point that you can understand what goes on behind the scene on whatever ui you use and stop being mystified, and even extend the data model beyond its primary use [1].

[0] https://schacon.github.io/gitbook/1_the_git_object_model.htm...

[1] https://github.com/bup/bup