/**
* Specify data which should be serialized to JSON
* @link http://php.net/manual/en/jsonserializable.jsonserialize.php
* @return mixed data which can be serialized by <b>json_encode</b>,
* which is a value of any type other than a resource.
* @since 5.4.0
*/
public function jsonSerialize()
{
return new JsonApiDocumentElement($this->getId(), User::class, ["username" => $this->getUsernameCanonical(), "email" => $this->getEmailCanonical(), "firstname" => $this->registry->getName(), "lastname" => $this->registry->getSurname()]);
}