new operator 'groupby'

kern/fraction-type.go

@@ -220,11 +220,12 @@ func anyToFract(v any) (f *FractionType, err error) {
 	if f, ok = v.(*FractionType); !ok {
 		if n, ok := v.(int64); ok {
 			f = intToFraction(n)
+		} else if dec, ok := v.(float64); ok {
+			f, err = Float64ToFraction(dec)
+		} else {
+			err = ErrExpectedGot("fract", TypeFraction, v)
 		}
 	}
-	if f == nil {
-		err = ErrExpectedGot("fract", TypeFraction, v)
-	}
 	return
 }
 
@@ -273,14 +274,16 @@ func CmpAnyFract(af1, af2 any) (result int, err error) {
 //	=0 if af1 == af2
 //	>0 if af1 > af2
 func cmpFract(f1, f2 *FractionType) (result int) {
-	f2.num = -f2.num
-	f := SumFract(f1, f2)
-	if f.num < 0 {
-		result = -1
-	} else if f.num > 0 {
-		result = 1
-	} else {
-		result = 0
+	if f1 != nil && f2 != nil {
+		f2.num = -f2.num
+		f := SumFract(f1, f2)
+		if f.num < 0 {
+			result = -1
+		} else if f.num > 0 {
+			result = 1
+		} else {
+			result = 0
+		}
 	}
 	return
 }