Comment by KenoFischer

Another testimonial from me. I basically refuse to do any debugging on systems that rr doesn't run on unless there's a very good reason. I use rr extensively whenever there's a bug in Julia and I would singlehandedly credit it with a measurable increase in system stability due to it catching bugs we'd never have gotten otherwise. roc is one of the few people with both the vision and persistence to really improve the debugging experience.