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

[Martijn Pieters]

Martijn Pieters added the comment:

Here's a proposed patch for tip; what versions would it be worth backporting this to?

(Note, there's no NEWS update in this patch).

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keywords: +patch
Added file: http://bugs.python.org/file45338/issue28598.patch

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