diff --git a/utils.go b/utils.go
index 57719bf..a0f6851 100644
--- a/utils.go
+++ b/utils.go
@@ -38,6 +38,10 @@ func isNumber(v any) (ok bool) {
 	return isFloat(v) || isInteger(v)
 }
 
+func isNumOrFract(v any) (ok bool) {
+	return isFloat(v) || isInteger(v) || isFraction(v)
+}
+
 func isNumberString(v any) (ok bool) {
 	return isString(v) || isNumber(v)
 }