Nette - database INSERT - number of affected rows

I would like to find out the number of affected (inserted) rows after inserting into the table. I didn't figure out how to do it in the documentation. The update returns the number of affected rows. The insert returns Nette\Database\Table\ActiveRow How do I get it?

$affected = $context->table('author')->insert([
    [
        'name' => 'Sansa Stark',
        'born' => null
    ], [
        'name' => 'Arya Stark',
        'born' => null
    ]
]);
bdump($affected); //  Nette\Database\Table\ActiveRow - I need the number of inserted records

Nette Database Explorer doesn't return count after insert(). It is not useful information as long as you can count data before insert by yourself.

$data = [...];
$count = count($data);
$context->table('author')->insert($data);

It works only with update and delete as is mentioned in documentation.

$count = $context->table('author')
    ->where('id', 10)
    ->delete();

It might be possible with getRowCount() over query in Nette Database Core