For a language as young as Julia, I'm really surprised that the author focused as much as he did on the Web REPL and development environment. These things can b

For a language as young as Julia, I'm really surprised that the author focused as much as he did on the Web REPL and development environment. These things can be added later, and I think at this point in the language lifecycle, the team behind it really needs to be focused on getting the fundamentals right (which they seem to be). For a good example of IDE as afterthought, look at RStudio (http://www.rstudio.org http://www.rstudio.org) - note that this came around after a decade of other, bad, GUIs for R. I actually see the matrix edge cases as pretty interesting - while they don't reflect the way I'd try to code things, they probably reflect the way someone codes things, and I imagine that their behavior is either due to a nasty implementation detail or oversight by the Julia core team. Either way, it's good to hash this stuff out now.