In addition to general description of implementation given here, askers can now unilaterally dupe-close their questions (provided they have sufficient privileges to cast close votes or flags).
I just tested this using one of my own questions here at MSE (see revision history).
It went as follows:
- I voted to close as duplicate (if my rep was above 15 but less than 3K I'd flag to close as duplicate)
- Refreshed my question in browser to make new duplicate prompt appear
- Clicked the big blue button ("That solved my problem!"), the question is instantly closed
I like the way it works. Although, I am apparently biased:
It occurred once or twice to me and have to admit, it felt... great. Just think of it, you get your answer, what could be better?
In cases like this I flag / or vote to close my own question myself...
The reason for "self-closure" is simple: since I found an answer, I want to save self from trouble of further "maintenance" of my question - you know, from studying and replying to possible comments, answers, from stuff like that.
Since I found an answer, I just don't need my question anymore, and the sooner I get it closed, the less I will need to worry about it in the future...
Worth adding that as an active close vote reviewer I also find this feature very promising. Per my observations, reviewing duplicates is much more difficult than the rest...
duplicates review went slower (much slower) than the rest: I had to study both questions, and in some cases I also had to check the answers to both questions...
...so additional chance to get help from asker is really great.
If they "accept" the duplicate, this simply cuts all the cumbersome work that I would have to do as reviewer, and if they edit in a compelling explanation of the difference, this makes it so much easier to decide to leave open.
For the sake of completeness, I already saw some inexperienced askers adding rather senseless "explanations" in response to a new prompt. If this gets widespread, we may have a problem.