Tcl (upon which Expect is built) is under-appreciated too. It's a neat language how strings behave as a sort of polymorphic data structure (can be dicts, lists,

Tcl (upon which Expect is built) is under-appreciated too. It's a neat language how strings behave as a sort of polymorphic data structure (can be dicts, lists, etc). Under the hood they get optimized based on usage.