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The (chickadee data queue)
module provides a mutable queue that
is more memory efficient than Guile’s built-in (ice-9 q)
module.
Return a new, empty queue.
Return #t
if obj is a queue.
Return #t
if queue is empty.
Return the current length of queue.
Add item to queue.
Remove and return the first item in queue.
Remove all items from queue.