From: Alexander Grund (alexander.grund_at_[hidden])
Date: 2020-06-02 09:26:37
> When you take an argument by const & or by value, LEAF does the ifs for you
> before calling your function (once it determines that all of its arguments
> are available). If an argument is taken by const *, and the value is not
> available, LEAF will still call the function, passing null for that
> argument.
Given the discussion I feel this is something that should appear
somewhere near the top of the tutorial