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> > If you find yourself writing bit-intensive programs in Lua, perhaps
> > a dedicated C function is recommended.
> 
> I disagree - I believe the recommended first-instinct now should be to
> use LuaJIT if you want to do intensive stuff in Lua. It's not always
> possible, but then custom C isn't always possible either.

What I had in mind was things like MD5 or SHA2 or other crypto stuff:
well-defined bit-intensive functions that are readily available as
C functions.