I am not sure if this is considered a "bug" or if it is simply expected
behavior, so I thought I would ask the list for clarification.
I have this test which passes and shows the strange behavior that I am
encountering:
(deftest update-in-and-remove
;; The leaf value becomes and empty list instead of [1 3]
(is (= {:mykey {:myotherkey '()}}
(update-in {:mykey {:myotherkey [1 2 3]}} [:mykey :myotherkey]
remove #{2})))
;; Forcing a vector results in the behavior that I would expect
(is (= {:mykey {:myotherkey [1 3]}}
(update-in {:mykey {:myotherkey [1 2 3]}} [:mykey :myotherkey]
(comp vec (partial remove #{2}))))))
I think this behavior is due to the use of apply in the definition of
update-in and I think (but haven't tested) adding a partial to the
non-recursive clause will fix this:
https://github.com/clojure/clojure/blob/master/src/clj/clojure/core.clj#L5687
However, I don't want to submit a "fix" if this is the expected behavior.
Thoughts?
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