There's some info in refman: http://www.lua.org/manual/5.2/manual.html#8
There was a more detailed summary at http://www.lua.org/work/doc/#changes but it looks like it's been taken down. There's the Google cache: http://tinyurl.com/832f273
There was a more detailed summary at http://www.lua.org/work/doc/#changes but it looks like it's been taken down. There's the Google cache: http://tinyurl.com/832f273