docs: def set_option(self, name, val, action=Empty, opts=Empty):
          """Determine which options were specified outside of the defaults"""
          if action is Empty and opts is Empty:
              self.specified.append(name)
              super(SpecRegister, self).set_option(name, val)
          else:
              super(SpecRegister, self).set_option(name, val, action, opts)