I wanted to try out TruffleRuby, so I took raw notes as I went, and thought it would be maybe useful to report them (like a kind of onboarding experience). Please feel free to close the issue or explode it into multiple parts, but at least this can be linked if other outsiders are willing to try it out. My interest for TruffleRuby comes from the fact I'm doing data processing with Ruby (using Kiba