Article JSON+LD Example Number 3 has syntax issue?

[inetbiz]

https://schema.org/Article#example-3 I think has syntax error?

{
  "@context": "http://schema.org",
  "@type": "Article",
  "author": "John Doe",
  "interactionStatistic": [
    {
      "@type": "InteractionCounter",
      "interactionService": {
        "@type": "Website",
        "name": "Twitter",
        "url": "http://www.twitter.com"
      },
      "interactionType": "http://schema.org/ShareAction",
      "userInteractionCount": "1203"
    },
    {
      "@type": "InteractionCounter",
      "interactionType": "http://schema.org/CommentAction",
      "userInteractionCount": "78"
    },
  ],
  "name": "How to Tie a Reef Knot"
}

The problem is down towards the end.

 },
  ],
  "name": "How to Tie a Reef Knot"
}

I think the first line shouldn't have a comma? JSON+LD Playground complains about it.

[inetbiz]

I'd also request this example show comments on the article nested as new articles within the article?

[inetbiz]

Tagging @jvandriel

[github-actions]

This issue is being tagged as Stale due to inactivity.

[HughP]

@RichardWallis this seems to be another documentation issue