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zip 

        # Enumerator::Lazy.zip

(from ruby core)
### Implementation from Lazy
---
    lazy.zip(arg, ...)                  -> lazy_enumerator
    lazy.zip(arg, ...) { |arr| block }  -> nil

---

Like Enumerable#zip, but chains operation to be lazy-evaluated. However,
if a block is given to zip, values are enumerated immediately.

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