在Erlang中是否有一种惯用的方法来命令函数参数？

-spec my_function(Arg1 :: term(), Arg2 :: term()) -> term().
my_function(Arg1, Arg2) ->
    DefaultValue = "default_value",
    FinalArg2 = case Arg2 of
                    undefined -> DefaultValue;
                    _ -> Arg2
                end,
    do_something(Arg1, FinalArg2).

-spec my_function(Arg1 :: term(), Arg2 :: term()) -> term().
my_function(Arg1, Arg2) ->
    do_something(Arg1, Arg2).