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> I'd be surprised if none of their employees have contributed to Git.

In git.git, there are 7 commits with @github.com authors, last one from 2014.

(I hope it just means GitHub folks are trying to blend into the crowd by using personal addresses, or something...)

I don't know what addresses they use but github engineering blog has a lot of examples of really useful contributions, e.g.:

> Shortly after our initial deploy, we also started the process of upstreaming the changes to Git so the whole community could benefit from them.

But I guess most of their git related work time goes to libgit2.