0-playbook.yml

---
- hosts: localhost
  gather_facts: false

  vars:
    test_values:
      - no
      - No
      - "no"
      - "No"
      - 'no'
      - 'No'

  tasks:
    - name: Show raw vars
      debug:
        var: item
      loop: "{{ test_values }}"

1-session.txt

$ ansible-playbook --version
ansible-playbook 2.10.3
  config file = None
  configured module search path = ['/home/user/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/local/lib/python3.6/dist-packages/ansible
  executable location = /usr/local/bin/ansible-playbook
  python version = 3.6.9 (default, Oct  8 2020, 12:12:24) [GCC 8.4.0]
  
$ ansible-playbook playbook.yml 
PLAY [localhost] ***********************************************************************************************************************************************************************************************************************

TASK [Show raw vars] *******************************************************************************************************************************************************************************************************************
ok: [localhost] => (item=False) => {
    "ansible_loop_var": "item",
    "item": false
}
ok: [localhost] => (item=False) => {
    "ansible_loop_var": "item",
    "item": false
}
ok: [localhost] => (item=no) => {
    "ansible_loop_var": "item",
    "item": "no"
}
ok: [localhost] => (item=No) => {
    "ansible_loop_var": "item",
    "item": "No"
}
ok: [localhost] => (item=no) => {
    "ansible_loop_var": "item",
    "item": "no"
}
ok: [localhost] => (item=No) => {
    "ansible_loop_var": "item",
    "item": "No"
}

PLAY RECAP *****************************************************************************************************************************************************************************************************************************
localhost                  : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0