Accept non-string values in response payload

src/Security/Http/Authentication/AuthenticationSuccessHandler.php

@@ -58,7 +58,7 @@ public function onAuthenticationSuccess(Request $request, TokenInterface $token)
     /**
      * Add fields to the response payload.
      */
-    public function addResponsePayload(string $key, string $value): void
+    public function addResponsePayload(string $key, $value): void
     {
         $this->responsePayload[$key] = $value;
     }