package and depencies

vendor/symfony/mime/Header/HeaderInterface.php

@@ -22,19 +22,15 @@ interface HeaderInterface
      * Sets the body.
      *
      * The type depends on the Header concrete class.
-     *
-     * @param mixed $body
      */
-    public function setBody($body);
+    public function setBody(mixed $body);
 
     /**
      * Gets the body.
      *
      * The return type depends on the Header concrete class.
-     *
-     * @return mixed
      */
-    public function getBody();
+    public function getBody(): mixed;
 
     public function setCharset(string $charset);