R. David Murray added the comment:

Victor: because it would break backward compatibility to raise an error where 
one wasn't raised before.  There's not enough motivation for that.  I'm not 
sure about the 1 case; it would again be a change in behavior.  Probably we 
should just document it as there isn't enough reason to risk breaking working 
code.

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nosy: +r.david.murray

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<http://bugs.python.org/issue28029>
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