[issue26720] memoryview from BufferedWriter becomes garbage

[Serhiy Storchaka]

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 <report at bugs.python.org>
<http://bugs.python.org/issue26720>
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