DOCUMENTATION:
  name: bool
  version_added: "historical"
  short_description: cast into a boolean
  description:
    - Attempt to cast the input into a boolean (C(True) or C(False)) value.
  positional: _input
  options:
    _input:
      description: Data to cast.
      type: raw
      required: true

EXAMPLES: |

  # simply encrypt my key in a vault
  vars:
    isbool: "{{ (a == b)|bool }} "
    otherbool: "{{ anothervar|bool }} "

  # in a task
  ...
  when: some_string_value | bool

RETURN:
  _value:
    description: The boolean resulting of casting the input expression into a C(True) or C(False) value.
    type: bool