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Sometimes it's very useful to visit duplicates of a same node, but doing so from the application is not convenient because keys have to be compared, while all the information is available during the next/prev steps. Let's introduce a couple of new eb_next_dup/eb_prev_dup functions to visit only duplicates of the current node and return NULL once it's done. Now we have all 3 combinations : - next : returns next node in the tree - next_dup : returns next dup in the sub-tree - next_unique : returns next value after skipping dups (cherry picked from commit 3327b8ae6866f3878322a1a29e70b450226d216d)