Nomic, a neat GitHub repo/game where you win points or change the rules with pull requests: https://github.com/jeffkaufman/nomic
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It's really satisfying to use a profiler for the first time on a project. I always find a big performance win with only a small code change.
It's never the code that I expected to be slow, however!
I'm increasingly doubtful that commit messages should be entirely immutable.
I sometimes find myself editing or commenting on merged pull requests, to help future readers.
Phabricator appended a URL to commit messages, which helped. In principle PR merging could do the same thing.
It's weird that GitHub shows time since the last commit, but not time since the first commit. It's a nice way of seeing how mature a project is.