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I think Brett has the right idea: we shouldn't try to accept numbers for %s in binary interpolation. If we limit it to just buffer exporters and objects with a \_\_bytes\_\_ method then the problem goes away.

The numeric codes all exist in Python 2, so the porting requirement to the common 2/3 subset will be to update the cases of binary interpolation of a number with %s to use an appropriate numeric formatting code instead.