A zipper doesn't create new teeth — it interlocks the two rows that already exist. Merging two sorted lists is the same: no new nodes, just the "next" threads getting rewired one snap at a time.
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🤐 ZipI only compare what's at the front of each track. Whoever's smaller, I snap onto next.
⚓ DummyI'm not a real value — just an anchor so tail always has somewhere to start from.