The include parameter in get_terms actually behaves like an "in" and …

…therefor it is mostly useless and as a result removing the option from the API #87

src/wp-includes/calmpress/class-post-authors-as-taxonomy.php

@@ -226,15 +226,13 @@ public static function combined_authors_url( \WP_Post $post ) : string {
 	 *
 	 * @param bool $include_empty Indicates if authors with no posts should be returned.
 	 * @param calmpress\post_authors\Post_Author[] $exclude Authors to always exclude.
-	 * @param calmpress\post_authors\Post_Author[] $include Authors to always include.
 	 *
 	 * @return calmpress\post_authors\Post_Author[] The authors.
 	 */
 	public static function get_authors( int $number,
 									int $sort_type,
 									bool $include_empty,
-									array $exclude,
-									array $include ) {
+									array $exclude ) {
 
 		$args['number'] = $number;
 
@@ -274,11 +272,6 @@ public static function get_authors( int $number,
 			$args['exclude'][] = $author->term_id();
 		}
 
-		$args['include'] = [];
-		foreach ( $include as $author ) {
-			$args['include'][] = $author->term_id();
-		}
-
 		$authors = get_terms( self::TAXONOMY_NAME, $args );
 
 		return array_map( function ( $term ) {