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completion arity (1) of a transducer function is called twice in a channel
will print
According to https://clojure.org/reference/transducers, it is probably a bug:
> A completing process must call the completion operation on the final accumulated value exactly once
Looks like completing fn is called at there places in core.async: https://github.com/clojure/core.async/blob/master/src/main/clojure/cljs/core/async/impl/channels.cljs#L122 https://github.com/clojure/core.async/blob/master/src/main/clojure/cljs/core/async/impl/channels.cljs#L146
I can confirm that I also encountered this and was surprised by the behavior.
completion arity (1) of a transducer function is called twice in a channel
will print
According to https://clojure.org/reference/transducers, it is probably a bug:
> A completing process must call the completion operation on the final accumulated value exactly once
Looks like completing fn is called at there places in core.async: https://github.com/clojure/core.async/blob/master/src/main/clojure/cljs/core/async/impl/channels.cljs#L122 https://github.com/clojure/core.async/blob/master/src/main/clojure/cljs/core/async/impl/channels.cljs#L146