Serhiy Storchaka added the comment:

Python implementation passes bytearray to underlying write and delete it's 
content just after that. Thus saving written data was never worked, and making 
it working don't worth efforts. I agree with you, we should add a warning 
against saving. This might be a part of issue20699.

As for original issue, this is potential crash, and we should fix this.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue26720>
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