[froderick]

Same here. Clojure offers a bunch of different invariants than ‘this field is a string’. Things like ‘nobody is modifying this complex data structure out from underneath you’ or ‘this complex value is trivially printable, readable, inspectable, comparable, diffable, etc’. And if you want to know for sure that field will be a string, you can spec it and enforce it where it matters. And ignore it where it doesn’t.