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

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

'Python 3.9' does not exist yet.  This choice is for patches that should only be applied to 3.9 when available (like future deprecations or removals).

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nosy: +terry.reedy
versions:  -Python 3.9

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<https://bugs.python.org/issue36411>
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