{
  "initial": {
    "title": "Initial request",
    "description": "Description to preserve",
    "priority": 3
  },
  "patches": [
    {},
    {"title": null},
    {"title": "Revised request"},
    {"description": null},
    {"priority": 0},
    {"priority": 5, "title": "Urgent request"}
  ],
  "questions": [
    "Which fields appear in model_fields_set?",
    "What should model_dump(exclude_unset=true) return?",
    "Which null value does the domain actually accept?"
  ]
}