Note from the publisher: You have managed to find some of our old content and it may be outdated and/or incorrect. Try searching in our docs for current information.In September 2013 we blogged about why we’re supporting Typed Clojure, and you should too! Now, 2 years later, our engineering team has made a collective decision to stop using Typed Clojure (specifically the core.typed library). As part of this decision, we wanted to write a blog-post about our experience using core.typed.The reason that we decided to stop using core.typed was because we found that the cost of using it was greater than the benefit we gained. This is a subjective view, of course, so we will detail our reasoning below.