docs: def add_method(self, pattern):
          """Decorator to add new dispatch functions."""
          def wrap(f):
              def frozen_function(class_instance, f):
                  def _(pattern, *args, **kwargs):
                      return f(class_instance, pattern, *args, **kwargs)
  
                  return _
  
              self.functions.append((frozen_function(self, f), pattern))
              return f
  
          return wrap