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8a0cbf04d6
Problem: Iter:peek() only works if the iterator is a |list-iterator| (internally, an `ArrayIter`). However, it is possible to implement :peek() support for any iterator. Solution: - add `_peeked` buffer for lookahead without actually consuming values - `peek()` now works for function, pairs(), and array iterators - `skip(predicate)` stops at the first non matching element without consuming it - keep existing optimized behavior for `ArrayIter` to maintain backward compatibility - use `pack`/`unpack` to support iterators that return multiple values
