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These new traits are identical to `Traits<Integral>`, except that calling `.hash()` will return the value itself instead of hashing it. This should be used in cases where either the value is already a proper hash, or using the value as a hash will yield "good enough" performance in e.g. HashTable. Types larger than 32 bits are folded in on themselves. Collision tests on some popular hashing algorithms show that XOR folding slightly increases the number of collisions, but this allows `IdentityHashTraits` not to make any assumptions on which bits are the most relevant for the final hash.