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> 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.

Lua has such a define (LUA_NOREF).