Still finding my way around Clojure... sorry if this is trivial.

I am using core.async to implement a queue for a collection of workers that 
pull jobs and complete them (there may be multiple producers as well).

All looks great so far.   Except when it comes time to close down the pipe 
(and drain if possible).

I don't see a good way to get the number of items in a channel.  I could 
construct the fixedbuffer explicitly and then keep a hold on it...  but 
this feels non-idiomatic (the buffer is mutated at a distance by operations 
on the channel).

Why not add a count operation to the channel??  It also seems useful for 
getting status information about the overall process (what is the average 
depth??).

Happy to be educated.

Thanks,
Paul

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