VersionPress\Utils\EntityUtils::isChanged PHP Method

    private static function isChanged($oldData, $newValue)
    {
        if (is_numeric($oldData) && is_numeric($newValue)) {
            return $oldData != $newValue;
        }
        if (is_string($oldData) && $oldData === "" && $newValue === null) {
            return false;
        }
        return $oldData !== $newValue;
    }