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> Is it possible to save the Lua VM state and restore it?

In principle, it can be done since the Lua API accepts a memory
allocator. Like you've said, it is tricky to handle userdata.

I've experimented with LPSM to make a Lua state persistent across
invocations of the interpreter. It worked reasonably well for a while.
The LPSM library is available at
but it does not seem to work on modern systems. I'd love to hear about
a modern replacement.