(take! [port fn1] [port fn1 on-caller?])Asynchronously takes a val from port, passing to fn1. Will pass nil
if closed. If on-caller? (default true) is true, and value is
immediately available, will call fn1 on calling thread.
fn1 may be run in a fixed-size dispatch thread pool and should not
perform blocking IO, including core.async blocking ops (those that
end in !!).
Returns nil.
Examples
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