{
  "type": "doc",
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    {
      "type": "heading",
      "attrs": { "level": 2 },
      "content": [
        { "type": "text", "text": "Notes for " },
        { "type": "mention", "attrs": { "id": "m-2", "label": "Bob", "entityType": "user", "entityId": "u-2", "slugId": "s-2", "creatorId": "c-2" } }
      ]
    }
  ]
}