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This is an age-old problem that crops up whenever "i" and
similar format codes are used.

The problem is that on the one hand you want "i" to accept
other int-ish types that have an __int__ method. But on the
other hand you don't want it to accept float, which also has
an __int__ method. Or other float-ish types.

I think the "i" format code has to be fixe, but I'm not sure
how -- maybe as a start it would be sufficient to test
explicitly for float and its subclasses and reject those.
That would still allow 3rd party float-ish classes that
implement __int__, but that's not so important.