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In the 5.2 documentation, in the section about the registry (4.5), it is written:

"The integer keys in the registry are used by the reference mechanism, implemented by the auxiliary library, and by some predefined values. Therefore, integer keys should not be used for other purposes."

But when I'm looking to the luaL_ref/luaL_unref source code, I don't find any access to the registry. Where does it come from?

Thank you!