Hook used when loading a single document.

        This is the hook we use to hook yatiml into ruamel.yaml. It is \
        called by the yaml libray when the user uses load() to load a \
        YAML document.

        Returns:
            A processed node representing the document.

def get_single_node(self) -> yaml.Node:
        """Hook used when loading a single document.

        This is the hook we use to hook yatiml into ruamel.yaml. It is \
        called by the yaml libray when the user uses load() to load a \
        YAML document.

        Returns:
            A processed node representing the document.
        """
        node = super().get_single_node()
        if node is not None:
            node = self.__process_node(node, type(self).document_type)
        return node