Todo Example Error — parent type mismatch

[Bonjour123]

I just started the graphQL server of the TODO example, as notified in the READ.ME. I might miss something, but for me:

Expected Behaviour

  mutation {
    createTodo(todo: { text: "Fery important", done:true }) {
      id
      text
      done
    }
  }

should return

{
  "data": {
      "createTodo": {
        "id": 31,
        "text": "Fery important",
        "done":true
      }
    }
  }

Actual Behavior

returns the following error:

  {
    "errors": [
      {
        "message": "parent type mismatch",
        "path": [
          "createTodo",
          "done"
        ]
      }
    ],
    "data": null
  }

Minimal graphql.schema and models to reproduce

Didn't changed anything in any file.

Note:

  mutation {
    createTodo(todo: { text: "Fery important", done:true }) {
      id
      text
    }
  }

returns well :

{
  "data": {
      "createTodo": {
        "id": 31,
        "text": "Fery important"
      }
    }
  }