Similarly, but I would be explicit about the different arities, to avoid 
the intermediate sequence created by [arg & [option]] and to get errors if 
there are too many arguments.

(defn foo
  ([input] (foo input (chan 1))
  ([input ch]
     ... do something and put to ch ...))

If your function can produce multiple outputs, you can `close!` the channel 
to signal it is finished, which is what `pipeline-async` expects.

–S

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