There are also numerous other improvements, including a history backup feature and documentation to help with migration from radian.

It was a particularly noteworthy improvement that pasting multiple lines now works perfectly on Windows,
because this was made possible by fixing a bug that had been left unfixed for years in crossterm!
github.com/crossterm-rs...

I never dreamed that writing arf would lead to such a situation.

Can you check the R path with the :info meta command?
It's possible that you're using the other R than the one installed by r2u (i.e., is rig not installed?).

Please specify the R path you want to use in your configuration file.

For example, when trying to initialize R on Windows, I was instructed to try all three methods (radian, sircon, and ark), and in the end only the ark method worked, so there was a lot of trial and error, but I don't understand the details myself. What's amazing is the ingenuity of our predecessors.

Actually, my Rust skills are not that great.
Most of the code for arf was written by Opus 4.5, and I only instructed them to refer to the source code of sircon, etc. (I was also in charge of manual testing.)

The installation size has become slightly smaller (9MB v.s. 11MB now), and I confirmed during development that startup times are faster.

As mentioned on mstdn, this is probably due to the fast drawing speed of Rust, so drawing may be faster than in the regular R console.

I don't think I could have done this kind of software without AI, so I have a lot of respect for what was written by hand, but times seem to have changed, for better or worse.

In fact, the existence of sircon convinced me that this was technically possible, and I've been thinking about making it someday.
I've never installed sircon, but after having Claude Code look at it, I was impressed by how incredibly advanced its functionality is.