/**
* Checks if another Activity matches the general information of another.
- * @param $activityB
- * @return bool
*/
- public function isSimilarTo($activityB)
+ public function isSimilarTo(Activity $activityB): bool
{
return [$this->key, $this->entity_type, $this->entity_id] === [$activityB->key, $activityB->entity_type, $activityB->entity_id];
}