(type (sorted-map-by > 3 1 2 4 5 3))
clojure.lang.PersistentTreeMap
user> (type (select-keys (sorted-map-by > 3 1 2 4 5 3) (list 5 2 3)))
clojure.lang.PersistentArrayMap
Not sure if this is related in any way but the topic of PersistentTreeMaps,
but I noticed this morning that select-keys doesn't return the same type of
map as that it was fed. That happens more often in clojure, so it might be
the default behaviour, and not something that needs to be fixed.
For now I just looked at source of select-keys, and made a copy of the
function that builds a sorted-map-by, rather than just a {}. Is that a
sensible way to do it.
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