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Description
I would like to construct a deque as follows collections.deque(maxlen=10). For this to work, iterables must have a default. The default should be an empty tuple or None, see: https://docs.python.org/3/library/collections.html#collections.deque
maxlen should also support keyword arguments but would not require a default, i.e not optional, since I don't need arbitrarily (unbounded) length deques.