Currently one can't send vars around in edn. #' is clojure reader specific. Objective is to transmit var identity and bind to same-named var on reading side (a la var serialization support).
Proposed: This is not generic enough to add to edn, so use #clojure/var for tag. Printing may print #clojure/var instead of #' (perhaps via a flag) - needs more assessment. #clojure/var tag reader should be installed in data readers.