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>From: Max McGuire <>
>I'm looking for a value that I can use in my C code to indicate that an 
>integer is not storing a valid reference, much like the NULL value is used 
>for indicating invaild pointers or LUA_NOOBJECT for lua_Object's.  The 
>requirement on this value is that lua_ref() will never return that value.

Use LUA_NOREF (introduced in 4.0).