Swiss tables are part of Abseil and Abseil provides its own hashing library. I haven't looked into the details of the implementation, but by default it's not us

Swiss tables are part of Abseil and Abseil provides its own hashing library. I haven't looked into the details of the implementation, but by default it's not using the identity function for ints. These are the first few hashes it generates for int inputs: 0: 918782482972292171 1: 12294850989704472498 2: 5224175424757160222 3: 16600243932558888071 4: 9529568361303343081 5: 2458892796473463123 6: 13834961304296162488 7: 6764285737197172256 8: 18140354246076836247 9: 11069678680190000369 10: 3999003117507595883