We could use [leading_zeros](https://doc.rust-lang.org/std/primitive.usize.html#method.leading_zeros) or [trailing_zeros](https://doc.rust-lang.org/std/primitive.usize.html#method.trailing_zeros) to iterate over the indices of set or unset bits, avoiding lots of arithmetic/shifting. https://github.com/contain-rs/bit-vec/issues/44
We could use leading_zeros or trailing_zeros to iterate over the indices of set or unset bits, avoiding lots of arithmetic/shifting.
contain-rs/bit-vec#44