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#function is a reader literal that tells the reader how to process the form that follows it.
X/Y/fn--10200 is the compiled symbol name of, I think, an anonymous function in a namespace X.Y...
Are you talking about this sort of output
user=> (defn f  (fn  42)) #'user/f user=> (f) #object[user$f$fn__149 0x1eaf1e62 "[email protected]"] user=>