How can I remove the default option on a Multiselect?

[bkuhl]

How can I remove the default Choose an option option altogether from being present on this Multiselect? I've tried defining the placeholder() as null or false with no luck. If there's not a mechanism, it might be useful to have a ->size(X) method that also removes the default option.

MultiSelect::make('Interest Mappings')
    ->withMeta([
        'size' => 5,
    ]);