Checks if data has changed.

        A file is considered changed if:
            - It doesn't exist on the working directory (was unlinked)
            - Checksum is not computed (saving a new file)
            - The checkusm stored in the State is different from the given one
            - There's no file in the cache

        Args:
            path_info: dict with path information.
            checksum: expected checksum for this data.

        Returns:
            bool: True if data has changed, False otherwise.

def changed(self, path_info, checksum_info):
        """Checks if data has changed.

        A file is considered changed if:
            - It doesn't exist on the working directory (was unlinked)
            - Checksum is not computed (saving a new file)
            - The checkusm stored in the State is different from the given one
            - There's no file in the cache

        Args:
            path_info: dict with path information.
            checksum: expected checksum for this data.

        Returns:
            bool: True if data has changed, False otherwise.
        """

        logger.debug(
            "checking if '{}'('{}') has changed.".format(
                path_info, checksum_info
            )
        )

        if not self.exists(path_info):
            logger.debug("'{}' doesn't exist.".format(path_info))
            return True

        checksum = checksum_info.get(self.PARAM_CHECKSUM)
        if checksum is None:
            logger.debug("checksum for '{}' is missing.".format(path_info))
            return True

        if self.changed_cache(checksum):
            logger.debug(
                "cache for '{}'('{}') has changed.".format(path_info, checksum)
            )
            return True

        actual = self.save_info(path_info)[self.PARAM_CHECKSUM]
        if checksum != actual:
            logger.debug(
                "checksum '{}'(actual '{}') for '{}' has changed.".format(
                    checksum, actual, path_info
                )
            )
            return True

        logger.debug("'{}' hasn't changed.".format(path_info))
        return False