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

belopolsky> Limiting field width when formatting error messages is 
belopolsky> a good safety measure.

The problem is that PyUnicode_FromFormatV() doesn't support %.100s format (it 
ignores .100). If we truncate at 100 bytes, it may truncate an UTF-8 string in 
the middle of a character :-/ And I don't want to implement it because I don't 
like arbitrary limitations in Python.

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<http://bugs.python.org/issue10833>
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