STINNER Victor <victor.stin...@haypocalc.com> added the comment:

I blocked the fix in Python 3.1 because it's non trivial and I prefer to avoid 
complex changes in Python 3.1. But then I realized that Python 3.1 has two bugs 
about environment variables.

It uses sys.getfilesystemencoding()+surrogateecape to decode variables and 
sys.getdefaultencoding()+strict to encode variables: the encoding is different!

It counts the number of *characters* to allocate the *byte* string buffer and 
so non-ASCII values are truncated.

So I decided to backport the fix: r80494.

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<http://bugs.python.org/issue8391>
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