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https://www.reddit.com/r/Clojure/comments/a6qptl/why_does_seq_nil_return_nil_but_str_nil_return/ https://www.reddit.com/r/Clojure/comments/a6qptl/why_does_se... https://bsima.me/clog/robust-clojure-nil.html https://bsima.me/clog/robust-clojure-nil.html