def _get_var_default(cls, name: str, annotation_value: Any) -> Any:
        """Get the default value of a (backend) var.

        Args:
            name: The name of the var.
            annotation_value: The annotation value of the var.

        Returns:
            The default value of the var or None.
        """
        try:
            return getattr(cls, name)
        except AttributeError:
            try:
                return types.get_default_value_for_type(annotation_value)
            except TypeError:
                pass
        return None
Get the default value of a (backend) var.

        Args:
            name: The name of the var.
            annotation_value: The annotation value of the var.

        Returns:
            The default value of the var or None.
        
reflex/state.py