@tbsp The way it works behind the scene is interpreting a single { as a JSI looking for a closing label called "lambdaXX". You can use runes with it like any other label, it's dynamically looking for its closing bracket. So you could do ={ }, -{ }, !{ }, etc..

C: git.sr.ht/~rabbits/uxn/tree/ma
tal: git.sr.ht/~rabbits/drifblim/tr