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.
Should unnamed vars (eg created by with-local-vars) print to #clojure/var nil or throw an exception? (exception is the print-dup behavior)
Comment made by: kunstmusik
I think the vartag2.patch has an issue in that the test for print-var-tagged in missing an assertion. I think it is supposed to have something like:
(is (and ...))
within the last let-binding.
Printing unnamed vars has little utility (nothing distinguishes them from each other without knowing their code context), seems like it would be fine to have #clojure/var nil or #clojure/var :unnamed