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A similar interesting approach is to write notes in Git commit messages. The author of the Spiral language does it: https://github.com/mrakgr/The-Spiral-Language/commits/master

This is different from commit messages. Commit messages are about the past. Notes are about the near future.

I hope that he won't write commit message like that for project that involve many people. Such log is no helpful (for anyone but him, I guess).

IMO, these are still useful, but should be rebased away before a PR in a large project.