Erlang has static types, they're just (a) always open and (b) always optional. It's more or less the most dynamic static typing regime imaginable. In personal u

Erlang has static types, they're just (a) always open and (b) always optional. It's more or less the most dynamic static typing regime imaginable. In personal use, it's highly valuable from a documentation standpoint, but does almost nothing for safety or restricting abuse of power.