Hi Andy

Apologies for the slow reply. This appears to be a bug. I am checking on the status of it and should have an answer for you soon.

-EDIT-

I've confirmed this is a bug. The syntax in the docs should work.

I have opened a ticket with our dev team to address it.

Provide your email address if you wish to be contacted offline about your comment.
We will not display your email address as part of your comment.

We'd love your feedback and perspective! Please be as specific as possible.
Type the characters you see in this picture. (verify using audio)

Type the characters you see in the picture above; if you can't read them, submit the form and a new image will be generated. Not case sensitive.