[issue36411] Python 3 f.tell() gets out of sync with file pointer in binary append+read mode

[Windson Yang]

Windson Yang <wiwindson at outlook.com> added the comment:

This looks interesting. Let me try to fix it.

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nosy: +Windson Yang
versions: +Python 3.8, Python 3.9 -Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36411>
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