Problem: After the completion of some task, the task issuer should be
informed about the completion/failure of the task - like by using some
struct { Result Result, Err error }.
Question: Which mechanism is preferred: using channels or callbacks?
Why the question: IMHO channels are the answer but there is this problem
with channels that after sending the result to the channel, if we close it,
there would be another signal which notifies the other side about the
channel be closed (in _, ok := <-rsultChan; ok will be false).
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