[issue35950] io.BufferedReader.writabe is False, but io.BufferedReader.truncate does not raise OSError

[Berker Peksag]

Change by Berker Peksag <berker.peksag at gmail.com>:


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pull_requests: +17956
pull_request: https://github.com/python/cpython/pull/18586

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35950>
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