An interesting commit in GNU Emacs: optimising the format command by allowing (format "%s" x) to just return x, saving a string allocation. This was already the place in some parts of elisp, but it's now documented and taken advantage of :)
https://github.com/emacs-mirror/emacs/commit/3db388b0bf83d3138562f09ce25fab8ba89bcc81
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Ooh, difftastic is now listed on the official git website!
I'm experimenting with jj this weekend. It seems pretty nice so far, but the mental model is pretty different from git.
For example, there's no `checkout` command. You do `jj new ABC` to switch to a commit, which creates a new empty commit on top of ABC.
In praise of Tcl, and reflecting on syntax features for a good command shell: