{
  "version": "https://jsonfeed.org/version/1.1",
  "title": "Feed with invalid attachment",
  "items": [
    {
      "id": "https://example.com/item1",
      "content_html": "<p>Test</p>",
      "attachments": [
        {
          "url": "https://example.com/file.mp3",
          "mime_type": 12345
        }
      ]
    }
  ]
}