Upgrade to 3.9.0

kirby/src/Api/Collection.php

@@ -23,7 +23,7 @@ class Collection
 	protected Api $api;
 	protected $data;
 	protected $model;
-	protected $select;
+	protected $select = null;
 	protected $view;
 
 	/**
@@ -36,7 +36,6 @@ class Collection
 		$this->api    = $api;
 		$this->data   = $data;
 		$this->model  = $schema['model'] ?? null;
-		$this->select = null;
 		$this->view   = $schema['view'] ?? null;
 
 		if ($data === null) {

kirby/src/Api/Model.php

@@ -91,12 +91,8 @@ class Model
 	 */
 	public function selection(): array
 	{
-		$select = $this->select;
-
-		if ($select === null) {
-			$select = array_keys($this->fields);
-		}
-
+		$select    = $this->select;
+		$select  ??= array_keys($this->fields);
 		$selection = [];
 
 		foreach ($select as $key => $value) {