I see you just replied to a post with: “Can you please paste full rule, or at least a stripped down version that reproduces your issue?”
Xtend, Kotlin, JavaScript, Python, etc… doesn’t make a difference when your having to ask for info that should have been provided as part of a new topic. I can’t see an agenda, at lease collectively, for a tutorial or book helping when people are already doing less than minimum.
Yes, I want a book but I won’t be selfish. There are many others that would benefit but the big question remains. With all things considered, is the time and effort really worth it?