Set sys_language_uid in an extbase command controller - typo3

Question

I have a command controller (an importer) run by scheduler, which should persist data as such:
foreach ($items as $item){
// store it
$entry = $this->objectManager->get('STUBR\Importer\Domain\Model\Item');
$entry->setTitle($item['Title']);
$entry->setData(json_encode($item));
// manually set the storage page (defined in scheduler form)
$entry->setPid($itemStoragePid); // works
// manually set the language (defined in scheduler form)
// EDIT
// $entry->setSysLanguageUid = -1; // had typo
$entry->set_languageUid(-1); // works
// END EDIT
$this->itemRepository->add($entry);
}
While neither pid nor sys_language_uid are set in the model, setPid behaves as expected, but setSysLanguageUid does not.
I'm aware that something is or was not quite right with setSysLanguageUid() in extbase (https://forge.typo3.org/issues/45873), although I wasn't able to grasp the problem entirely.
How do I manually store into the sys_language_uid column?
PS: I've tried Extbase Model: setSysLanguageUid not working but probably I missed something

Answer 1

It's solved, I had a typo above
Solution from #Chi at https://stackoverflow.com/a/33798615/160968
/**
* languageUid
* #var int
*/
protected $languageUid;
/**
* #param int $languageUid
* #return void
*/
public function setLanguageUid($languageUid) {
$this->languageUid = $languageUid;
}
/**
* #return int
*/
public function getLanguageUid() {
return $this->languageUid;
}
And then $entry->setLanguageUid(-1);