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ded4dfde19
The current implementation is slow because it does an operation for every bit in the set, even zero bits. So if you have a large bitset with many zero bits (which is common) it's very slow. This commit improves the iterator to skip over `Zeros` chunks in a single step, and uses the fast `BitIter` for `Mixed` chunks. It also removes the existing `fold` implementation, which was only there because the old iterator was slow.