The problem is that not all the languages tested have a Set type. This is why all the implementations use a Hash or map or associative array type, which are rou

The problem is that not all the languages tested have a Set type. This is why all the implementations use a Hash or map or associative array type, which are roughly the same thing. Othwerwise we are comparing apples with oranges. I also refuse to use anything which is not included in the standard library. The program does really basic stuff, so all of its building blocks should be in the core language. This is why the Rust implementation is slower than D or Go - because it uses HashMap which is slower than D's associative arrays or Go's maps.