[flavio81]

>That means that a field called "date" can be either a string, integer days since the epoch or a Java Date, and (because this codebase isn't great) there's no way of knowing without tracing the call stack.

But this is because JSON is an untyped data structure. (And btw, a flawed one...)

You would have this problem in any programming language.

[Capricorn2481]

In other languages you would know which date you were dealing with based on the type regardless of the function you were in. In Clojure, you have to either name the variable date-string or find which API it came from, which means tracing the call stack