Kinda hard to tell when I can’t find a single example of the language on its website.
It took a while to click through a link to an actual implementation on github, which had some test examples. None of which were documented.
So idk? I'm not going to buy the ebook for $41 to find out.
So to answer your original question: Liskell, despite being 13 years old and unmaintained, does actually have an accessible document that _explains what it is_.