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> Interesting approach, as math.random(), based on ansi C `rand()`, isn't really considered as a good random generator.

Lua 5.3 uses POSIX random instead of rand, in POSIX platforms.
> Personally, I did something analog, but as a change to the Lua source code, by defining a `luai_rand` macro in `luaconf.h`:

Lua 5.3 now supports macros l_rand and l_srand which can be set by the builder.