Comment by IshKebab

I would say C makes this sort of thing far more likely because it's usually a ton of effort to obtain suitable containers. In C++ or Rust they have plenty of things like `unordered_set`/`HashSet` built in, so people are much more likely to use it and not go "eh, I'll use a for loop".

In this case Git already had a string set, but it's still not standard so there's a good chance the original author just didn't know about it.