[
  [
    'input',
    null,
    'At least one of:\n' +
      '  - object \n' +
      '    where all numeric keys are:\n' +
      '      type: string \n' +
      '    with properties\n' +
      '      - "a" (optional): \n' +
      '          tuple:\n' +
      '            -  At least one of:\n' +
      '              - type: number\n' +
      '              - value: "foo"\n' +
      '              - value: false\n' +
      '              - object \n' +
      '                with properties\n' +
      '                  - "a": \n' +
      '                      tuple:\n' +
      '                        -  type: number\n' +
      '                        -  Array of:\n' +
      '                          At least one of:\n' +
      '                            - type: number\n' +
      '                            - type: string\n' +
      '            - (optional)  type: number\n' +
      '            - (rest type) type: string\n' +
      '      - "b": \n' +
      '          At least one of:\n' +
      '            - value: "bar"\n' +
      '            - value: false\n' +
      '  - type: number'
  ]
]