使用dns\U签入salt(其中文档似乎错误)

这个 saltstack docs 请注意 dns_check 2017年7月3日的jinja过滤器:

{{ 'www.google.com' | dns_check }}

它应该以字符串形式返回ip4v地址。

但当我尝试时:

test_this_one:
  cmd.run:
    - name: |
        echo {{ 'www.google.com' | dns_check }}

我看到了

local:
    Data failed to compile:
----------
    Rendering SLS 'base:firewall' failed: Jinja error: dns_check() takes at least 2 arguments (1 given)
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/salt/utils/templates.py", line 418, in render_jinja_tmpl
    output = template.render(**decoded_context)
  File "/usr/lib/python2.7/dist-packages/jinja2/environment.py", line 989, in render
    return self.environment.handle_exception(exc_info, True)
  File "/usr/lib/python2.7/dist-packages/jinja2/environment.py", line 754, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "<template>", line 42, in top-level template code
TypeError: dns_check() takes at least 2 arguments (1 given)

我错过什么了吗?我倾向于相信我犯了一个错误,而不是那些文件是如此公开的错误。