recip for Ratio

In the Haskell 98 Library Report, recip is defined for the Ratio type as: recip (x:%y) = if x < 0 then (-y) :% (-x) else y :% x Is it intentional that recip (0 % 1) is not an error? Everywhere else the denominator is forced to be positive. Infinity can be a useful number, if the type is consistent about it. -- Scott Turner p.turner@computer.org http://www.billygoat.org/pkturner