Emanuel Barry added the comment:

Changing the behaviour when sep is None is a big backwards-compatibility break, 
and I'm not sure we'd even want that. It's logical to allow passing None to 
mean the same thing as NULL (i.e. no arguments), and the behaviour in that case 
has been like that for... well, long enough that changing it isn't really 
feasible.

I agree with Barry here, especially since this is a completely opt-in feature, 
and existing behaviour isn't changed without the user's knowledge.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28937>
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