I realize `dissoc` isn't implemented to work on vectors for technical 
reasons (such as explained on 1/13/11 here 
https://groups.google.com/forum/#!msg/clojure/Lx9ysZ4ndfw/E52rVTvclMoJ ).

"It'd be nice" if it did as I still get surprised by this on occasion, it 
feels like an inconsistency when using Clojure such that I'd imagine it's a 
general point of frustration for others as well.


(assoc [1 2 3] 1 'a)
;=> [1 a 3]

(dissoc ['a 'b 'c] 1)
;=> ClassCastException clojure.lang.PersistentVector cannot be cast to 
clojure.lang.IPersistentMap  clojure.lang.RT.dissoc (RT.java:759)


(assoc-in [['a 'b] ['c 'd]] [1 1] 'x)
;=> [[a b] [c x]]

(clojure.core.incubator/dissoc-in [['a 'b] ['c 'd]] [1 1])
;=> ClassCastException clojure.lang.PersistentVector cannot be cast to 
clojure.lang.IPersistentMap  clojure.lang.RT.dissoc (RT.java:759)

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