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

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

As for the C version of the patch:
- I'm not sure why you make self->ok handling more complicated than it was
- encodefunc should not be forced to NULL, otherwise it will yield a big
decrease in write() performance

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<http://bugs.python.org/issue5006>
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