STINNER Victor added the comment:
> I would expected ['A', 'B', None].
Hum, it seems consistent with list behaviour, no?
>>> x=list("abc")
>>> x.insert(-1, "X")
>>> x
['a', 'b', 'X', 'c']
-1 is the same than len(x)-1 (2 in this example).
deque(['A', None, 'B'], maxlen=3) seems correct to me.
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nosy: +haypo
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<http://bugs.python.org/issue26194>
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