Does lua_setuservalue reference the value?

[Marc Balmer <marc@...>]

When I set a function argument as the uservalue of a userdata object, is that value automatically being referenced (like luaL_ref()) and will thus not be auto-gc'ed?

And if so, when the userdata is later being gc'ed, will the refercen to the uservalue be un-refed?

Thanks for any insight,
Matv