• The functions (to open libraries) cannot be called directly, like a regular C function. They must be called through Lua, like a Lua function.
    • Functions luaL_getn and luaL_setn (from the auxiliary library) are deprecated. Use instead of and nothing instead of luaL_setn.
    • Function now throws an error when the given value is not a userdata of the expected type. (In Lua 5.0 it returned NULL.)