refactored data-types to reduce plugin sizes

operator-fact.go

@@ -9,6 +9,7 @@ import (
 
 	"git.portale-stac.it/go-pkg/expr/kern"
 	"git.portale-stac.it/go-pkg/expr/scan"
+	"git.portale-stac.it/go-pkg/expr/types"
 )
 
 //-------- fact term
@@ -30,7 +31,7 @@ func evalFact(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error) {
 		return
 	}
 
-	if kern.IsInteger(leftValue) {
+	if types.IsInteger(leftValue) {
 		if i, _ := leftValue.(int64); i >= 0 {
 			f := int64(1)
 			for k := int64(1); k <= i; k++ {