2.2. Hacking

Of course Interchange's source is completely open and available. You could, if you wished, hack on it all you wanted. However this is strongly discouraged, for the simple reason that you can override almost any behavior with configurations and tag definitions of your own. In fact, if you want to override a core routine you can even do that.

So if you are tempted to hack a routine in the core, simply override it with:

GlobalSub <<EOR
sub override_me {
        package Vend::Interpolate;
        sub shipping {