diff --git a/types/data.go b/types/data.go
index b18195d..cca7560 100644
--- a/types/data.go
+++ b/types/data.go
@@ -31,11 +31,9 @@ func (data Data) GetSlice(key string) (res Slice, err error) {
 		return nil, err
 	}
 
-	switch value := value.(type) {
+	switch v := value.(type) {
 	case []interface{}:
-		return value, nil
-	case Slice:
-		return value, nil
+		return v, nil
 	default:
 		return nil, ErrFormat
 	}
@@ -125,11 +123,9 @@ func (data Data) GetData(key string) (Data, error) {
 		return nil, err
 	}
 
-	switch value := value.(type) {
+	switch v := value.(type) {
 	case map[string]interface{}:
-		return Data(value), nil
-	case Data:
-		return value, nil
+		return v, nil
 	default:
 		return nil, ErrFormat
 	}
@@ -149,9 +145,9 @@ func (data Data) GetDataSlice(key string) ([]Data, error) {
 	}
 
 	var list []Data
-	for _, v := range values {
-		switch v := v.(type) {
-		case Data:
+	for _, value := range values {
+		switch v := value.(type) {
+		case map[string]interface{}:
 			list = append(list, v)
 		default:
 			return nil, ErrFormat