[petcat]

I'm pretty sure that's only OpenResty's distribution of LuaJIT.

I think the real LuaJIT is strictly 5.1

[Tharre]

Not true, see "Extensions from Lua 5.2" here: https://luajit.org/extensions.html

[reactordev]

No, real LuaJIT has some features from 5.2 and 5.3

https://luajit.org/extensions.html