http://confreaks.tv/videos/railsconf2015-ruby-debugger-internals http://confreaks.tv/videos/railsconf2015-ruby-debugger-inter... This is a video by Dennis Ulsh

http://confreaks.tv/videos/railsconf2015-ruby-debugger-internals http://confreaks.tv/videos/railsconf2015-ruby-debugger-inter... This is a video by Dennis Ulshakov, the maintainer. I haven't watched this in its entirety but it's only 20 mins.