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Python documentation says that it splits in "whitespace 
characters" not "breaking characters". So, current 
behavior is correct according to the documentation. And 
even rationale among string methods are heavily depends on 
ctype functions on libc. Therefore, we can't serve special 
treatment for the NBSP.

However, I feel the need for the splitting function that 
awares what character is breaking or not. How about to add 
it as unicodedata.split()?