Clojurians Log v2

I was just looking at the types for the *-in core functions, and noticed that the second arg (which is nearly always a vector in real code) is marked as seqable rather than sequential . I’m pretty sure there isn’t, but can anyone think of legit code where you’d use a seqable but not sequential second arg? The compiler and runtime are happy with these because they are seqable, but they rarely return anything:

(get-in {:a {:b 42}} {:a :b})
;; => nil

(get-in {:a {:b 42}} #{:a :b})
;; => nil

(get-in {:a {:b 42}} ":a:b")
;; => nil

and when they do, it feels like more luck than judgement:

(get-in {:b {:a 42}} #{:a :b})
;; => 42

(that succeeded because the hash order of those set constituents happens to match a valid path in the map) If not, I suggest we tighten up the type to :sequential or :nilable/sequential (thoughts?)