In the SRFI 128 sample implementation, file comparators.sld, I believe
the library form needs

    (import (scheme char) (scheme complex) (scheme inexact))

due to the use of, e.g., string-foldcase, imag-part, and infinite?
(resp.) in comparators-impl.scm.

I realize the SRFI is already finalized, but since the above small
change only affects the sample implementation, I'm guessing it can be
put in place.