I just saw something that's hard to explain - maybe someone has some ideas.
A user just asked a (java programming) question titled:
Difference between replace and replaceAll
Which was closed fairly rapidly as a duplicate of this, whose title is:
Difference between String replace() and replaceAll()
Experimenting, I opened the "Ask a question" page and pasted in the title... sure enough, the duplicate is right on top of the list, with 36 votes. This is without entering any tags, of which the dupe had all.
How did the user miss the duplicate?
The titles are nearly identical!
Does the UI need a rethink?
Can we be louder about duplicates? Should a confirmation dialog be added for strong matches?
P.S. As Nick has said - this is not an isolated case. This one is a standout collision, but there is a steady flow of "very close" duplicates.