<xstd/bits/bit_array/hash.hpp>, <xstd/bits/bit_array/container_hash.hpp>

hash, is_range, is_tuple_like

• hash<basic_bit_array<Block, N>>: operator() is noexcept and returns xstd::bit_hash<T, boost::hash2::xxhash_64>()(x), the hash of the bits. array<bool, N> has no hash; this one does, and equal values hash equal.
• A Boost.Hash2 hash_append hook appends exactly the message Hash2 writes for the array<bool, N> of the same value, so xstd::hash<T, H, Flavor>()(x) == xstd::hash<array<bool, N>, H, Flavor>()(m) for that m.
• is_range and is_tuple_like are false_type, so Boost.ContainerHash and Hash2 take the hook rather than hashing the array as a range or as a tuple.