Re:Apache Software Foundation joins GitHub open source commu...
by xorcist on Monday April 29, 2019 @03:54PM
(#19781992)
Maybe you are thinking of Monotone. It shares some design, such as referencing commits by their hashes and zero copy branching.
I think Linus said at some point that if only performance would have been sufficient for the Linux kernel, there would have been no git (but don't quote me on that).
They were both released extremely close together, and I don't remember why I associate Mercurial ideas as being something Git learned from. Maybe I'm wrong about it.