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> The current API does not allow giving upvalues to the hook function  
> from C API. This would be required in multithreading scenarios where  
> several Lua states may be using the same lua_Hook function.

What you want is a closure not upvalues. Hook functions are not Lua
functions and so cannot have upvalues. So a better and equivalent API
would be to sethook to receive a void* just like reader functions.