I think this is valid optimization, it avoids extra allocation and
computation when the gcd is 1.
- Qian
diff --git a/src/algebra/fraction.spad b/src/algebra/fraction.spad
index d9f4754a..b98a3d37 100644
--- a/src/algebra/fraction.spad
+++ b/src/algebra/fraction.spad
@@ -365,6 +365,7 @@ Fraction(S : IntegralDomain) : QuotientFieldCategory
S with
cancelGcd x ==
((x.den) = 1) => x.den
d := gcd(x.num, x.den)
+ one? d => d
xn := x.num exquo d
xn case "failed" =>
error "gcd not gcd in QF cancelGcd (numerator)"
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