For future reference: I asked Mary (the author) about this and she said, "Great point! As far as structure of the data, the file may as well be a text file of l

For future reference: I asked Mary (the author) about this and she said, "Great point! As far as structure of the data, the file may as well be a text file of lines of information. I decided to omit talk about how git actually stores data to focus on the structural concepts. Maybe I should have included a bullet point. I don't actually control the version of the article that was posted on HN. but I'll certainly update the version on my website."