[issue28598] RHS not consulted in `str % subclass_of_str` case.

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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resolution: fixed -> 
stage: resolved -> needs patch
status: closed -> open
versions: +Python 2.7 -Python 3.5, Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28598>
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