https://blog.github.com/2018-11-08-100M-repos/#top-open-source-projects https://blog.github.com/2018-11-08-100M-repos/#top-open-sour... What does the "Contribu

https://blog.github.com/2018-11-08-100M-repos/#top-open-source-projects https://blog.github.com/2018-11-08-100M-repos/#top-open-sour... What does the "Contributors" column depict? 19K (19000) cannot be people. Are these commits?