not the OP but this struck home for me because I just recently worked with Clojure and I was surprised that there was no standard library to deal with filepath operations. Having to use Java's nio, immediately exposed some weirdnesses, like having to pass an empty array to Paths.get() because just calling it with a string with one parameter made it chose the wrong overloaded function.

Vararg support in interop and type creation (deftype/defprotocol) seems like a reasonable ask.

You can type hint to pick the one of the type you're looking for. It's not any weirder than in Java, no need to pass an empty array.

Yeah. I've just started on a couple things, and it's slow going because I have contract work and burgeoning Clojure blog. However, I'm working on a stripe API library that is up to date, and a syslog server library.

It's these API-wrapping and protocol-handling type libraries that either are way out of date, or just don't exist.