DOCUMENTATION:
  name: nan
  author: Ansible Core
  version_added: "2.5"
  short_description: is this not a number (NaN)
  description:
    - Whether the input is a special floating point number called L(not a number, https://en.wikipedia.org/wiki/NaN).
  aliases: [is_file]
  options:
    _input:
      description: Possible number representation or string that can be converted into one.
      type: raw
      required: true
EXAMPLES: |
    isnan: "{{ '42' is nan }}"

RETURN:
  _value:
    description: Returns C(True) if the input is NaN, C(False) if otherwise.
    type: boolean