$sortField not applying when $multiSort is true

[kolydart]

public string $sortField has no effect for default sort when public bool $multiSort = true;

[krjohnston]

Started to use this package recently and found this issue.
This is possible but needs to be added to the documentation.

When declaring $multiSort = true;, you need to change the sort defaults to an array property $sortArray.

public array $sortArray = ['name' => 'asc'];

public bool $multiSort = true;