document:
  nodes:
  - object: block
    type: ul_list
    nodes:
    - object: block
      type: list_item
      nodes:
      - object: block
        type: paragraph
        nodes:
        - object: text
          leaves:
            - text: 'First item'

    - object: block
      type: list_item
      nodes:
      - object: block
        type: paragraph
        nodes:
        - object: text
          leaves:
            - text: 'Second item'
      - object: block
        type: ul_list
        nodes:
        - object: block
          type: list_item
          nodes:
          - object: block
            type: paragraph
            nodes:
            - object: text
              key: 'start'
              leaves:
                - text: ''

selection:
  anchorKey: 'start'
  anchorOffset: 0
  focusKey: 'start'
  focusOffset: 0
  isFocused: true