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...and a shameless plug for my (WIP) Redis Module that doesn't implement a "bloomy" interface, for once

Cuckoo hashing was one of the more interesting concepts I learned back in school. Definitely a fun way of implementing a hash table.

Do you have a tldr for how/when it is better than bloom filters?

When you want an error rate lower than 3% and you can properly size the filter as it can fail insertions if you overfill it.