Hello,

here is my use case 

(defn replay [history] (go (doseq [millis history] 
                                          (<! (timeout millis)) 
                                          (prn millis))))

history is a vector of duration: [1000 2000 4000]

Now I would like to pause this doseq. One way is to use an atom pause?, 
check for the pause and block until a new value in a "resume" chan.

But there may be an other way with channels only and avoid global/shared 
pause atom.
I was naively thinking of a pause channel and at each loop I check if there 
is a value but I'm not sure it's better and I couldn't manage to do it 
anyway.

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