Pretty well thank you. I now use it everyday as my primary shell, but the documentation isnt where I'd want it yet so I can imagine it would trip new users up in areas I've chosen to break from POSIX / "Bashisms". There are also a few areas of subtle bugs I'm still running into, but that is to be expected with anything on this kind of scale.
It is already open source but I'm the only contributer currently. Which is fine as it's a personal project anyway. So anything beyond that is a bonus.
The readline API I wrote for it is pretty nifty though. I'm thinking of spinning that off into its own repo since I've been a little disappointed with the existing realine APIs for Go so I think other people might genuinely benefit from that even if they're not particularly interested in a semi-Bash compatible alternative $SHELL.
Cool. Good luck with it. Interesting about the readline stuff. Can you share the link to the shell project? I'd like to look at the code, with a view to learning something about the techniques involved, as command-line tools and shells is an interest of mine.