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> To get the missing information, maybe a function like this could be added:
> 
>     /* push upvalues for function at given index into the stack, returns
> number of upvalues */
>     int lua_getcclosure( lua_State*, int index );

Lua 4.0 is almost finished, and we will not add anything to it now. But
we will think about this for 4.1.

-- Roberto