I filed a bug report, dealing with Sequel and SQLite, with a minimal example reproducing the problem. The jist of it, is when I create a new instance of my class that is subclassed from Sequel::Model, and attempt to assign data to it, it crashes with a SIGABRT. Looking through the backtrace (which is also attached), it seems to crash in Sequel's model class, when inspecting the object. Mind you, I'm not actually doing any inspection of the new instance, I'm only creating an instance of the class, and attempting to assign data to it. It simply fails, and crashes on MacIRB. I have no problems with Ruby itself, as it runs just perfect, and as expected. I dunno what is causing the issues, but I figured I would bring it up, as I filed the ticket here:
https://www.macruby.org/trac/ticket/930