"read Clojure's source"?

i've looked at https://clojure.github.io/clojure/clojure.core-api.html and https://clojuredocs.org/clojure.core/sequential_q

https://insideclojure.org/2015/01/02/sequences/

"Java perspective" part

in case others are curious, there's a relevant Lambda Island episode: https://lambdaisland.com/episodes/clojure-seq-seqable.

@U3X7174KS clojure.lang.Sequential is a Java interface, not a protocol. The sequential? predicate specifically tests for that interface, in the same way that the seq? predicate specifically tests for the ISeq interface. The latter actually has methods. The former is just a "marker" interface.

That Inside Clojure article is interesting in that it talks about seqable? which we do have now.

Thanks for the clarification :thumbsup: