I think asking a question like this largely depends on domain, what sort of (even exceptional) lets say, rails developer is going to know in-depth information a

I think asking a question like this largely depends on domain, what sort of (even exceptional) lets say, rails developer is going to know in-depth information about hash table implementations off the top of their head? I'd expect anyone who knows how to code in anything to understand the concept of an associative array, but not necessarily the nuances of hashing and performance, especially not the performance of specific hashing algos. Most of that work is handled by language designers/compiler designers for you in the majority of use cases. I suspect you work in a field where this sort of information is far more well known/common to deal with in day to day?