Array to String Conversion Error on array_diff() of new and old attributes

[dsdobrzynski]

Upon saving an active record, I get a yii\base\ErrorException of Array to string conversion

Stack trace in /var/www/html/leadworks/protected/vendor/sammaye/yii2-audittrail/LoggableBehavior.php line 101

            foreach ($oldattributes as $f => $v) {
                if (array_search($f, $ignoredFields) !== false)
                    unset($oldattributes[$f]);
            }
        }
 
        // If no difference then WHY?
        // There is some kind of problem here that means "0" and 1 do not diff for array_diff so beware: stackoverflow.com/questions/12004231/php-array-diff-weirdness :S
        if (count(array_diff_assoc($newattributes, $oldattributes)) <= 0)
            return;
 
        // If this is a new record lets add a CREATE notification
        if ($insert) {
            $this->leaveTrail(self::ACTION_CREATE);
        }
 
        // Now lets actually write the attributes
        $this->auditAttributes($insert, $newattributes, $oldattributes);

In Yii2, JSON fields are converted to arrays:

This needs to be accounted for in some way.