Greg Ward added the comment:

Random comments from original author of textwrap.py, in case anyone cares at 
this point...

* This is a pretty obscure edge case, and I admit that it never occurred to me 
when writing the code. (If it had, I would have tested it!)

* One can debate endlessly about whether this is a bug or not -- witness the 
recent discussion on this bug. Meh. Not interesting. IMHO it's better described 
as undefined behaviour. If you want it defined, write tests to enforce the 
status quo and improve the docs.

* If there is a consensus to change the current behaviour, IMHO it should NOT 
be done on 2.7. Even if the new behaviour is better by some definition, it's 
still a behaviour change that could bite someone. Those changes should happen 
when you make a major upgrade (3.2 to 3.3, say), not when you make a bug fix 
upgrade (2.7.3 to 2.7.4). IOW: keep it on trunk. Or default, whatever we're 
calling it these days. ;-)

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<http://bugs.python.org/issue15510>
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