snap get with multiple values does not return json

[eraserix]

$ snap version
snap 2.32.9+18.04
snapd 2.32.9+18.04
series 16
ubuntu 18.04
kernel 4.15.0-22-generic

Excerpt from "snap get -h":
...
If multiple option names are provided, a document is returned:

$ snap get snap-name username password
{
"username": "frank",
"password": "..."
}
...

However, I don't get a json document:
$ sudo snap get chuck-norris-webserver title port
Key Value
port 81
title i can bind

Code or documentation is wrong.

[John Lenton (chipaca)]

The docstring is wrong. Sorry. We'll fix it.