5.1 and a few features from 5.2 such as hexadecimal escapes in strings. I could be woefully out of date but they are/were listed here http://luajit.org/extensi

5.1 and a few features from 5.2 such as hexadecimal escapes in strings. I could be woefully out of date but they are/were listed here http://luajit.org/extensions.html http://luajit.org/extensions.html