I chose luajit for my language and while I agree with many of your points I really miss a typesystem. Somewhat ironically I'm working on a typesystem for luajit..

I also wish it was a bit more performant, but here it's likely my medium to high level code and not luajit's fault. However running the test suite in plain Lua seem some order of magnitude slower than luajit, so it's a lot faster than plain Lua at least.