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

> it's conceivable that arbitrary data could even be 
> placed in the username field.

On Ubuntu, it's not possible to create an user with a non-ASCII name:

$ sudo adduser é --no-create-home
adduser: To avoid problems, the username should consist only of
letters, digits, underscores, periods, at signs and dashes, and not
start with a dash (as defined by IEEE Std 1003.1-2001). For
compatibility with Samba machine accounts $ is also supported at 
the end of the username

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue4859>
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