[issue20574] Implement incremental decoder for cp65001

[Roundup Robot]

Roundup Robot added the comment:

New changeset f6794a0fb2b3 by Victor Stinner in branch 'default':
Issue #20574: Remove duplicated test failing on Windows XP
http://hg.python.org/cpython/rev/f6794a0fb2b3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20574>
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