[MERGE] UTF-8 encoding in binary diffs

[Aaron Bentley]

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John Arbash Meinel wrote:
> Martin Pool wrote:
> try:
>   self.build_tree(u'unicode\u03a9')
> except UnicodeError:
>   raise TestSkipped('Platform cannot represent unicode characters')
> 
> It isn't what I would prefer, but that is what we have been using.

Perhaps we could implement the Unicode feature by doing a read operation
rather than a write.  e.g, I'd expect "stat(u'/\u1234')" to raise a
UnicodeError rather than an IOError on platforms with no unicode support.

Aaron
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