Really happy to see Pat keeping it up! His first Ruby under a Microscope book but also his blog posts are amazing and a major source of inspiration for me. I did meet him personally in a Euruko conference. Such a great person.

I loved Ruby Under a Microscope when I first read it, and using that knowledge was able to have fun with some CTFs years ago.

I haven't kept up with the evolving Ruby implementation internals, so I will sure as heck buy this new version of the book.

IIRC MacRuby used to compile to native code on OSX using LLVM, and was supposed to support native OSX APIs and Objective-C frameworks. It always seemed like a neat idea, and a slick integration, but I guess Apple moved to Swift instead.

I'll have to pick up a copy of this "Ruby Under a Microscope" book when the new version comes out. I've always liked Ruby, I just haven't had much chance to use it.