Hello all. Getting an interesting exception when trying to show the result of a sexp while using clerk/page-size nil

(def foo "318") 

Unhandled clojure.lang.ExceptionInfo
   n must be a number?
   {:n nil, :xs "318"}

If the def is hidden or the view is explicitly stated there is no issue. And it is the same for any string in a def

https://gist.github.com/seb231/2d65215990a4453d1b582d06d462db15