It'd be nice if defn did s/instrument when you're working at the repl.

Any chance something like that is on the radar?

I think that’d be wrong for everyone sometimes

I’d prefer to have a lot more control over things like that

Agreed. I definitely would not want auto-instrument at the REPL (and how would the compiler tell the difference between REPL and regular running since the semantics are the same?).

(remember that not everyone AOT's code!)