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To my understanding it’s not so much a fork of Lua as it is a complete rewrite in C++. They’ve created their own custom VM and everything. The closest version it has parity with is Lua 5.1.4, with a few compatible features from 5.2 and 5.3 backported.

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The VM still has a lot of Lua 5.1 code. It's definitely a fork.

Wow, now that's even more impressive.

Makes me wonder if there's anything useful to "upstream" to vanilla lua here, or if the VM deviated too far.

PUC-Rio's Lua doesn't take contributions anyway, right? It's open source but it's not an open project. Similar to.. uh.. nethack, at least how it used to be :)

https://www.lua.org/community.html

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