list iterators now support start, stop e step

data-cursor.go

@@ -9,15 +9,6 @@ import (
 	"io"
 )
 
-const (
-	initName    = "init"
-	cleanName   = "clean"
-	resetName   = "reset"
-	nextName    = "next"
-	currentName = "current"
-	indexName   = "index"
-)
-
 type dataCursor struct {
 	ds          map[string]Functor
 	ctx         ExprContext
@@ -77,7 +68,7 @@ func (dc *dataCursor) HasOperation(name string) (exists bool) {
 
 func (dc *dataCursor) CallOperation(name string, args []any) (value any, err error) {
 	if name == indexName {
-		value = dc.Index()
+		value = int64(dc.Index())
 	} else if functor, ok := dc.ds[name]; ok && isFunctor(functor) {
 		if functor == dc.cleanFunc {
 			value, err = dc.Clean()