Hi,
The following function has been a real _lifesaver_ lately in debugging
symbol collisions in (ns) directives when developing with SLIME in a
long-running VM:

(defn ns-unmap-all
  "Unmap all the symbols (except 'ns' and 'in-ns')."
  ([] (ns-unmap-all *ns*))
  ([ns] (map #(ns-unmap ns %) (keys (ns-map ns)))))

May I kindly suggest the inclusion of something similar along with all
the other core namespace functions?
It's quite nice (IMHO: necessary) to be able to get back to a clean
environment when you face a collision error.
(I'm guessing may of you have something similar already defined in
your environments.)

cheers,

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