Comment by blandflakes

Common Lisp is great.

That said, the reason I like static languages for teams is where the "burden of proof" lies. With dynamic languages, the default being rather loosey goosey means my colleague writes a function that "asks" whether the thing handed to it is a list or an object and I have to somehow convince them that it should just take a single type, for consistency's sake... but with a static language even though people try probably exactly the same amount of weird, shit, it sticks out like a sore thumb and needs justification to include in the first place.