Frill was not built for bug reporting but inevitably people will still use it to create bugs reports. And you don't always want those bugs to be in a public forum.
Well, now you can mark an idea as a bug.
In doing so, the idea is kept private between you and the creator. The creator will get all the same notifications as the bug makes its way through your roadmap, but it will be hidden from everyone else.
For more on how 'Mark as Bug' works, check out our help doc.