Not very clear what the diff tool is attempting to do. Just looking at the Clojure code, I feel there's better approaches in Clojure to achieve the same or bet

Not very clear what the diff tool is attempting to do. Just looking at the Clojure code, I feel there's better approaches in Clojure to achieve the same or better results. More clarity would be helpful. Also, transducers are a big performance win for long sequences of values. You cannot even begin to guess where your performance problems are until you use something like YourKit (https://www.yourkit.com https://www.yourkit.com) which is an excellent tool. With very little effort and a few type hints you can sometimes more than double your Clojure performance.