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I found data on commits in the git, before 2005 (the year of its release) how to explain it?

As far as I understand from wikipedia, git has existed since 2005, how then did I find the records that someone has made before? (this is shown on the graph)

this commit on github

gvanrossum committed on 10 Aug 1990 

commit 7f777ed95a19224294949e1b4ce56bbffcb1fe9f
Solution

  • The cpython source code had been using a centralized version control system (VCS; first CVS, now Subversion) before it migrated to a distributed one. After PyCon 2009 it was decided to migrate to Mercurial. The commit history was not lost.

    In 2015, it was migrated again from Mercurial (hg.python.org) to GitHub.