cfunction
(fiber/status fib)
Get the status of a fiber. The status will be one of:
* :dead - the fiber has finished
* :error - the fiber has errored out
* :debug - the fiber is suspended in debug mode
* :pending - the fiber has been yielded
* :user(0-9) - the fiber is suspended by a user signal
* :alive - the fiber is currently running and cannot be resumed
* :new - the fiber has just been created and not yet run