Casting and Type Hinting

*e

#error{:cause "Cannot cast org.apache.pdfbox.pdmodel.graphics.color.PDColor to [F",
       :via [{:type java.lang.ClassCastException,
              :message "Cannot cast org.apache.pdfbox.pdmodel.graphics.color.PDColor to [F",
              :at [java.lang.Class cast "Class.java" 3606]}],
       :trace [[java.lang.Class cast "Class.java" 3606]
               [clojure.lang.Reflector boxArg "Reflector.java" 552]
               [clojure.lang.Reflector boxArgs "Reflector.java" 585]
               [clojure.lang.Reflector invokeMatchingMethod "Reflector.java" 132]
               [clojure.lang.Reflector invokeInstanceMethod "Reflector.java" 102]
               [ventures.fierce.pdfbox.appearance_content_stream$non_stroking_color_GT_
                invokeStatic
                "appearance_content_stream.clj"
                39]
               [ventures.fierce.pdfbox.appearance_content_stream$non_stroking_color_GT_
                invoke
                "appearance_content_stream.clj"
                36]
               [ventures.fierce.pdfbox.check_box$appearance_content_stream_BANG_ invokeStatic "check_box.clj" 65]
               [ventures.fierce.pdfbox.check_box$appearance_content_stream_BANG_ invoke "check_box.clj" 48]
               [ventures.fierce.pdfbox.check_box$create_appearance_stream$fn__2484 invoke "check_box.clj" 84]
               [ventures.fierce.pdfbox.check_box$create_appearance_stream invokeStatic "check_box.clj" 83]
               [ventures.fierce.pdfbox.check_box$create_appearance_stream invoke "check_box.clj" 76]
               [ventures.fierce.pdfbox.check_box$set_appearances_BANG_ invokeStatic "check_box.clj" 93]
               [ventures.fierce.pdfbox.check_box$set_appearances_BANG_ invoke "check_box.clj" 90]
               [ventures.fierce.pdfbox.check_box$eval2493$fn__2495 invoke "check_box.clj" 145]
               [clojure.lang.MultiFn invoke "MultiFn.java" 234]
               [ventures.fierce.pdfbox.core$add_fields_BANG_ invokeStatic "core.clj" 54]
               [ventures.fierce.pdfbox.core$add_fields_BANG_ invoke "core.clj" 50]
               [ventures.fierce.pdfbox.core$eval2596 invokeStatic "core.clj" 19]
               [ventures.fierce.pdfbox.core$eval2596 invoke "core.clj" 58]
               [clojure.lang.Compiler eval "Compiler.java" 7177]
               [clojure.lang.Compiler eval "Compiler.java" 7132]
               [clojure.core$eval invokeStatic "core.clj" 3214]
               [clojure.core$eval invoke "core.clj" 3210]
               [nrepl.middleware.interruptible_eval$evaluate$fn__936 invoke "interruptible_eval.clj" 91]
               [clojure.main$repl$read_eval_print__9086$fn__9089 invoke "main.clj" 437]
               [clojure.main$repl$read_eval_print__9086 invoke "main.clj" 437]
               [clojure.main$repl$fn__9095 invoke "main.clj" 458]
               [clojure.main$repl invokeStatic "main.clj" 458]
               [clojure.main$repl doInvoke "main.clj" 368]
               [clojure.lang.RestFn invoke "RestFn.java" 1523]
               [nrepl.middleware.interruptible_eval$evaluate invokeStatic "interruptible_eval.clj" 84]
               [nrepl.middleware.interruptible_eval$evaluate invoke "interruptible_eval.clj" 56]
               [nrepl.middleware.interruptible_eval$interruptible_eval$fn__962$fn__966
                invoke
                "interruptible_eval.clj"
                155]
               [clojure.lang.AFn run "AFn.java" 22]
               [nrepl.middleware.session$session_exec$main_loop__1063$fn__1067 invoke "session.clj" 190]
               [nrepl.middleware.session$session_exec$main_loop__1063 invoke "session.clj" 189]
               [clojure.lang.AFn run "AFn.java" 22]
               [java.lang.Thread run "Thread.java" 834]]}