小编pt1*_*pt1的帖子

Ansible 任务可以有when这样的子句：

- name: Conditional output
  debug:
    msg: This is a conditional output
  when: some_var

为了防止some_var未定义，可以使用

- name: Conditional output
  debug:
    msg: This is a conditional output
  when: some_var is defined and some_var

似乎还有这样的变体：

- name: Conditional output
  debug:
    msg: This is a conditional output
  when: some_var | d() | bool

这些变体相同吗？它们的优点/缺点是什么？