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> Of course it's pure Lua -- the FFI interface is a library. Would
> you say that the use of LuaSocket or LPEG libraries makes an
> application no longer a pure Lua application?

Of course, if the intention of "pure Lua" is to emphasize that no
external libraries are needed. Quite offen in this list someone offers
an LPEG solution and got the reply "I prefer a solution in pure Lua" (or
something along these lines).

I may be wrong, but I got a clear impression that he used "pure Lua" to
meant "Lua without external libraries". (Otherwise an implementation of
the quadrature routine in a C library exported to Lua would be "pure
Lua" too.)

-- Roberto