IsOptional() function of ExprFuncParam renamed as IdDefault(). A new IsOptional() function created to check if a param is optional without requiring a default value

func-math.go

@@ -168,11 +168,11 @@ func mulFunc(ctx ExprContext, name string, args []any) (result any, err error) {
 
 func ImportMathFuncs(ctx ExprContext) {
 	ctx.RegisterFunc("add", &golangFunctor{f: addFunc}, TypeNumber, []ExprFuncParam{
-		NewFuncParamFlagDef(paramValue, PfOptional|PfRepeat, int64(0)),
+		NewFuncParamFlagDef(paramValue, PfDefault|PfRepeat, int64(0)),
 	})
 
 	ctx.RegisterFunc("mul", &golangFunctor{f: mulFunc}, TypeNumber, []ExprFuncParam{
-		NewFuncParamFlagDef(paramValue, PfOptional|PfRepeat, int64(1)),
+		NewFuncParamFlagDef(paramValue, PfDefault|PfRepeat, int64(1)),
 	})
 }