[tyre]

Reading the update to Enum.sort, I could see in my head how easy a change this would be in elixer.

Supporting a different second parameter (a symbol rather than a function) can be implemented with another function that pattern matches to :asc or :desc. They can each call the original function(s) too.

In many other languages you'd start `sort` with a conditional and that function would need to handle every case. Not here. Each function worries about itself and what it can handle.

There's a beauty and practicality that Elixir hits so well.