[aspett]

> We Elixir programmers usually don’t think in terms of sum types.

This person speaks.. for themselves only.

> perhaps I'll make an exception for dialyzer

If your opinion is to disregard Elixir, then dialyzer shouldn't change your mind. It's pretty ineffective and painful to use.

That said, I'm a big proponent of Elixir; it's a great language and makes me happy to use it.