I'd like to point out that my proposed hash function lends itself nicely to
incremental hashing for sets.
Furthermore, maps also have very weak hashing, and would benefit from a
similar change. Right now:
=> (hash {1 1})
0
=> (hash {1 1 2 2})
0
=> (hash {1 1 2 2 3 3})
0
=> (hash {1 2 2 3 3 1})
6
=> (hash {1 3 2 1 3 2})
6
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