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LuaJIT:

+ Super easy FFI to C

+ Very fast (although profile to make sure this matters)

PUC Lua:

+ Possible to run untrusted code (e.g. user scripts) in a sandbox

+ Will run on a huge variety of platforms, including many microcontrollers (only limiting factor is a C compiler and a mostly-complete libc)

+ Has some additional language features (although some features, including integers, are controversial)

+ Actively maintained, expected to receive new releases and updates






What does PUC mean in “PUC Lua”?

PUC-Rio[1] which is the university where the original authors and current maintainers work. See "Where does Lua come from?" here: https://www.lua.org/about.html

[1] https://www.puc-rio.br/english/





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