anchor.diff:                   (resolve (http/ok "hello world"))))))
   ----
   
  -One of the advantages of using `CompletableFuture` abstraction with _promissum_ and
  +One of the advantages of using `CompletableFuture` abstraction with _promesa_ and
   _cats_ libraries is that them both exposes additional sugar syntax that work with
   promises in a more painless way.
   
  
positive.code: 
  [source, clojure]
  ----
  (require '[promissum.core :as p])
  (require '[cats.core :as m])
  
  (defn my-async-handler
  
negative.code: ----
  
  In addition to plain return value, you can freely return a promise or deferred
  (from *promesa* and *manifold* libraries respecively). And if that abstractions
  dors not satisfies you, the system is completly open to be extended with your
  own abstractions.
  
  