The goal is rapid prototyping. I'd also say that these types of operations can be considered features and not necessarily errors. While string + number is proba

The goal is rapid prototyping. I'd also say that these types of operations can be considered features and not necessarily errors. While string + number is probably usually an error (who hasn't done that at least once), in Scotch, the + operator represents not only addition but list construction and concatenation - so Scotch's + is equal to +, ++, and : from Haskell.