STINNER Victor added the comment:
What is the cost of adding an extra isinstance(d, collections.Sequence) check?
It would be closer the current design ("white list" of types), safer and avoid
bad surprises.
But Python has a long tradition of duck typing, so maybe isinstance() can be
seen as overkill :-)
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nosy: +haypo
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<http://bugs.python.org/issue29368>
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