The code was getting soupy, so it went through a full OOP/PSR-0 rewrite. Additionally, it will dump uniform arrays of objects or assoc arrays as record tables. See attached screenshot or try it out at http://o-0.me/dump_r/
Unfortunately as a result the lib is no longer a single file, though it's still a single-file-include, whether installed through Composer or without. Also, the way in which it can be extended has improved significantly over the prior version.