:a in arcadia.debug's break results in clojure.lang.ArityException

[sogaiu]

Attempting to follow the example in the wiki docs:

user=> (use 'arcadia.debug)
nil
user=> user=> nil
user=> (future (let [x (+ 1 2)] (break)))
#object[Future 0x22022400 {:status :pending, :val nil}]
user=> (break)

Entering ':a' leads to an exception at the debug prompt:

debug:2:=> :a
clojure.lang.ArityException: Wrong number of args (1) passed to: arcadia/debug/breakpoint-summary-vec--628
* clojure.lang.AFn
* arcadia/debug/print-available-breakpointsfn
* clojure/core/map-indexedmapifn
  clojure.lang.LazySeq.sval ()
  NO_CLASS.NO_METHOD
  clojure.lang.LazySeq.seq ()
  NO_CLASS.NO_METHOD
  clojure.lang.RT.seq (object)
* clojure/core/seq
* clojure/core/mapfn
  clojure.lang.LazySeq.sval ()
  NO_CLASS.NO_METHOD
  clojure.lang.LazySeq.seq ()
  NO_CLASS.NO_METHOD
  clojure.lang.Cons.next ()
  clojure.lang.RT.BoundedLength (clojure.lang.ISeq, System.Int32)
* clojure.lang.RestFn
* clojure/core/apply
* arcadia/debug/table
* arcadia/debug/print-available-breakpoints
* arcadia/debug/repl-read-fnrepl-read
* clojure/main/replread-eval-printfn
* clojure/main/replread-eval-print

This was with Unity 2018.3.0f2, Manjaro Linux, on the master branch (33beafb).