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With respect to `std::unordered_map` documentation, the `Hash` type defined in the template is over the `Key` and not `T`, the value. This hasher is incorrectly named as the `FilterHeader` is the value within this map. I consider this a bug as opposed to a refactor as the key and value relationship is implied to be `filter header -> block hash` when it is the opposite. Further, the hasher for the key already exists via `BlockHasher`. ref: https://en.cppreference.com/w/cpp/container/unordered_map.html