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I think "k" and "feat.second" have the same value in line 135-136 of "tracks.hpp", but they represent different meanings. Reference to the input of "uf_tree.Union()" in line 118, "feat.second" might be the more logical choice for the input of "uf_tree.Find()".
The reason why "k" and "feat.second" have the same value but different meanings can be find in the issue: #2267