Mark H Weaver scripsit:

> Several implementations that are not able to represent mixed exactness
> in the general case are able to do so in one special case: when the
> imaginary part is exact 0.

I don't think the behavior of `imag-part` is a reliable indication of this.
It may be simply that it returns 0 when the argument is a flonum.

--
Why are well-meaning Westerners so concerned that   John Cowan
the opening of a Colonel Sanders in Beijing means   cowan@ccil.org
the end of Chinese culture? [...]  We have had      http://www.ccil.org/~cowan
Chinese restaurants in America for over a century,
and it hasn't made us Chinese.  On the contrary,
we obliged the Chinese to invent chop suey.            --Marshall Sahlins

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