[issue10807] `b'dGVzdA==\n'.decode('base64')` raise exception

[STINNER Victor]

Changes by STINNER Victor <victor.stinner at haypocalc.com>:


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nosy: +georg.brandl
priority: normal -> release blocker

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10807>
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