Armin Rigo added the comment:

@Serhiy: it's a behavior change and as such not an option for a micro release.  
For example, the following legal code would behave differently: it would 
compute s = '\\u1234' instead of s = 'UTF8:\xe1\x88\xb4'.

    try:
        s = repr(x)
    except UnicodeEncodeError:
        s = 'UTF8:' + x.value.encode('utf-8')

I think I agree that a working repr() is generally better, but in this case it 
should point to the programmer that they should rather have __repr__() return 
something sensible and avoid the trick above...

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue5876>
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