Bard (a new Lisp from Mikel Evins)
bywicket.com
bywicket.com
Slow clap.
If void behaves like nil in other languages, that's bad. But if it behaves like None in Haskell, that's good.
But like most specifications for unimplemented software, he could have just forgotten to add this, and will realize he needs the other half when he starts implementing.