John Cowan <cowan@mercury.ccil.org> writes:

> ComplexRepresentations explains which
> Schemes support and don't support exact complex numbers and complex
> numbers of mixed exactness (which are considered inexact by R7RS).

There is another notable distinction that is not recorded in
ComplexRepresentations.  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.

Examples of such implementations include Guile 2.0, Racket, and Ikarus.

    Thanks,
      Mark

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