When closing a duplicate, a message pops up above the question saying
Possible duplicate: < link >
but underneath the post, it will say:
Closed as exact duplicate by: < list of users >
So is it 'possibly' a duplicate or is it an 'exact' duplicate?
I get especially narked off by this when the linked duplicate isn't the exact same question... and it requires a small amount of know-how to use the previous answers. (Though I appreciate it's normally trivial know-how)
I don't mind the practice of closing duplicates which aren't 'exact' if they're close enough and the process is deemed proper by the community. I just get a little narked off by this language ambiguity as its easy to feel "hey but they didn't really give me an answer to the question!" and its possible the asker doesn't have that 'trivial know-how'.