================================================================================
Example 279 - https://github.github.com/gfm/#example-279
================================================================================
- [ ] foo
- [x] bar

--------------------------------------------------------------------------------

(document
  (section
    (list
      (list_item
        (list_marker_minus)
        (task_list_marker_unchecked)
        (paragraph
          (inline)))
      (list_item
        (list_marker_minus)
        (task_list_marker_checked)
        (paragraph
          (inline))))))

================================================================================
Example 280 - https://github.github.com/gfm/#example-280
================================================================================
- [x] foo
  - [ ] bar
  - [x] baz
- [ ] bim

--------------------------------------------------------------------------------

(document
  (section
    (list
      (list_item
        (list_marker_minus)
        (task_list_marker_checked)
        (paragraph
          (inline)
          (block_continuation))
        (list
          (list_item
            (list_marker_minus)
            (task_list_marker_unchecked)
            (paragraph
              (inline)
              (block_continuation)))
          (list_item
            (list_marker_minus)
            (task_list_marker_checked)
            (paragraph
              (inline)))))
      (list_item
        (list_marker_minus)
        (task_list_marker_unchecked)
        (paragraph
          (inline))))))

================================================================================
task list item marker … the letter x in either lowercase or UPPERCASE
================================================================================
- [ ] foo
- [X] bar

--------------------------------------------------------------------------------

(document
  (section
    (list
      (list_item
        (list_marker_minus)
        (task_list_marker_unchecked)
        (paragraph
          (inline)))
      (list_item
        (list_marker_minus)
        (task_list_marker_checked)
        (paragraph
          (inline))))))
