Well, he's not releasing it generally yet, so it's not fair to criticize not releasing documentation. This was created by someone else. He mentioned that when

Well, he's not releasing it generally yet, so it's not fair to criticize not releasing documentation. This was created by someone else. He mentioned that when he open-sources it or soon after, he's planning on releasing the engine from the game Thekla is currently working on, which will provide a good sample of "idiomatic Jai". I'm hoping that good documentation will come with it.