Method mutable_iterator

ext/include/tsl/array-hash/array_hash.h:1363–1368

* Other */

   * Other
   */
  iterator mutable_iterator(const_iterator it) noexcept {
    auto it_bucket =
        m_buckets_data.begin() +
        std::distance(m_buckets_data.cbegin(), it.m_buckets_iterator);
    return iterator(it_bucket, it.m_array_bucket_iterator, this);
  }

  template <class Serializer>
  void serialize(Serializer& serializer) const {