[issue8390] tarfile: use surrogates for undecode fields

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

My patch changes test_uname_unicode() of test_tarfile for the GNU and ustar formats (but not PAX). In GNU and ustar formats, the fields can be encoded in any encoding, and may contain invalid byte sequences.

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<http://bugs.python.org/issue8390>
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