I've used the Picolisp REPL like that, though not as a login shell proper, but as the shell where I actually do stuff. Mainly due to the ease with which it inte

I've used the Picolisp REPL like that, though not as a login shell proper, but as the shell where I actually do stuff. Mainly due to the ease with which it integrates with the below shell through 'in, 'out and 'fork.