Shortcode self-closing bug?

Hello,

Based on the shortcode api, I wrote a plugin that had two versions of the shortcode.

The first version involved just writing [PageThing] in a post. This would be the most common and simple usage.
The second version was: [PageThing]pageurl[/PageThing], to include data from other sites. However, when both versions were used in the same post, it stopped to function. I.e:
——————————-
My Stuff
[PageThing]
My friend’s stuff
[PageThing]www.friendsurl.com[/PageThing]
——————————-

Then, in (pseudo)code, I had:
IF no shortcode content: Do this!
ELSE: Do that!

Didn’t work, because WP believed that everything between first and last shortcode was the content of just one shortcode – with the shortcode content:
————
My friend’s stuff
[PageThing]www.friendsurl.com
———–
So, I assumed that it was because the first shortcode wasn’t enclosed.
But changing [PageThing] to [PageThing /] made no difference.

Since the API says both versions can be used, this is either a bug, or something that needs to be clarified in the API.

I solved it by changing my code to use the attribute instead:
[PageThing] and [PageThing url=”www.friendsurl.com”]