Enum is not a functor, it always goes from enumerable to lists. It’s also a set of eager funcions, the funcional composition you assume is not used here nor is it common in Elixir.
If you want to consider it a functor, you need to apply its properties yourself, Elixir won’t do it for you. But know that functors as a concept dont exist in elixir the way they exist in Haskell or Ocaml.
I also have to note that the Pipe operator just pipes function calls like the unix Pipe does, it’s not a functional composition operator.
