I thought that the flagging privilege (15 rep) was always required to flag posts, but there's an exception: 1-rep users can flag their own post (my smelly sock just did the experiment). Only custom moderator flags are allowed, not close flags.
The only discussion I could find on the topic is 3 years old, and Jeff's answer then was
I don't think I can support this. There's too much risk allowing anonymous and low-rep users to flag their own content.
Yet it's possible now. Is this a bug or by design?
More generally, should new users be able to flag their own post or not, and why?