Allow null, int and float responses

src/mako/http/Response.php

@@ -99,7 +99,7 @@ public function getRequest(): Request
 	/**
 	 * Sets the response body.
 	 */
-	public function setBody(ResponseBuilderInterface|ResponseSenderInterface|string|Stringable $body): Response
+	public function setBody(null|float|int|ResponseBuilderInterface|ResponseSenderInterface|string|Stringable $body): Response
 	{
 		$this->body = $body;