Bug: afterUpdate event return array instead of key value

[oleg1540]

Describe the bug
I tried to use model events - afterInsert and afterUpdate.
protected $afterInsert = ['someFunction'];
protected $afterUpdate = ['someFunction'];

According the docs afterInsert and afterUpdate must return id:

id = the primary key of the new row, or 0 on failure.
id = the primary key of the row being updated.

But afterUpdate return id as array.
I opened system/Model.php and found out there this code:
if (is_numeric($id) || is_string($id)) { $id = [$id]; }
...
$eventData = [ 'id' => $id, 'data' => $eventData['data'], 'result' => $result, ];
In this regard, the question - is it bug in event data or inaccuracy in the docs?

CodeIgniter 4 version
4.0.3.

Expected behavior, and steps to reproduce if appropriate
I expected to get primary key value in someFunction instead of array.
protected function someFunction($data) { var_dump($data['id']); // didn't expect array }
Another way - make notice about it in docs.

Context

• OS: [Windows 7]
• Web server [Apache 2.4]
• PHP version [7.4.5]

[michalsn]

I guess that the user guide has to be updated. It's because update() method accepts also an array of ids.

PR would be appreciated :)

[oleg1540]

Ok, I'll make PR with changes in docs :)