small bug with wpseo_exclude_from_sitemap_by_post_ids

This piece of code from your plugin overwrites the values set by others

add_filter( ‘wpseo_exclude_from_sitemap_by_post_ids’, function () {
return array( $this->settings[‘404page_page_id’] );
} );

I think it should become:
add_filter( ‘wpseo_exclude_from_sitemap_by_post_ids’, function ($alreadyExcluded) {
return alreadyExcluded->Add(array( $this->settings[‘404page_page_id’] ));
} );