This article is focussed on performance of large data sets. Unless you have gigabytes of user IDs to hash on a regular basis, it doesn't matter what hash you u

This article is focussed on performance of large data sets. Unless you have gigabytes of user IDs to hash on a regular basis, it doesn't matter what hash you use aside from achieving the randomness you desire, which I imagine almost any function, even x%2==0, would achieve.