[issue18818] Empty PYTHONIOENCODING is not the same as nonexistent

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Here is a patch with tests and documentation. For the documentation I hope on your help.

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Added file: http://bugs.python.org/file31447/empty_pythonioencoding_3.patch

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<http://bugs.python.org/issue18818>
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