type fixes

Author: dg

src/PhpGenerator/ClassType.php

@@ -51,7 +51,7 @@ final class ClassType
 	/** @var string[] */
 	private $implements = [];
 
-	/** @var string[] */
+	/** @var array[] */
 	private $traits = [];
 
 	/** @var Constant[] name => Constant */

src/PhpGenerator/Method.php

@@ -89,7 +89,7 @@ public function setBody($code, array $args = null): self
 			$code = null;
 			trigger_error(__METHOD__ . '() use null instead of false', E_USER_DEPRECATED);
 		}
-		$this->body = $args === null ? $code : Helpers::formatArgs($code, $args);
+		$this->body = $args === null || $code === null ? $code : Helpers::formatArgs($code, $args);
 		return $this;
 	}