[issue5006] Duplicate UTF-16 BOM if a file is open in append mode

[STINNER Victor]

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

See also issues #5008 (f.tell()) and #5016 (f.seekable()), not 
directly related to this issue.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5006>
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