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fp2zero? x2 x1procedure
fp2rational? x2 x1procedure
fp2positive? x2 x1procedure
fp2negative? x2 x1procedure
fp2infinite? x2 x1procedure
fp2nan? x2 x1procedure
x2
flonum
x1
flonum

Like zero?, rational?, positive?, negative?, infinite? and nan?, but for double-double flonums.