The snippet below evaluates to true, then false with myvar=false. How come? 
ansible version 2.2.1.0 on OSX High Sierra

---
- name: do stuff without curlies
  become: no
  hosts: all
  tasks:
    - name: echo
      shell: echo x
      when: something == 'yes' and myvar

- name: do stuff with curlies
  become: no
  hosts: all
  tasks:
    - name: echo
      shell: echo x
      when: "{{ something == 'yes' and myvar }}"


$ ansible-playbook play.yml -c local -i 127.0.0.1, -e myvar=false -e 
something="yes"

PLAY [do stuff without curlies] 
************************************************

TASK [echo] 
********************************************************************
Thursday 07 December 2017  10:15:48 +0000 (0:00:00.080)       0:00:00.080 
*****
changed: [127.0.0.1]

PLAY [do stuff with curlies] 
***************************************************

TASK [echo] 
********************************************************************
Thursday 07 December 2017  10:15:49 +0000 (0:00:00.470)       0:00:00.551 
*****

PLAY RECAP 
*********************************************************************
127.0.0.1                  : ok=1    changed=1    unreachable=0    failed=0

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