update1

bind_test.go

@@ -1019,7 +1019,6 @@ func Test_Bind_Body(t *testing.T) {
 		writer := multipart.NewWriter(buf)
 		require.NoError(t, writer.WriteField("data[0][name]", "john"))
 		require.NoError(t, writer.WriteField("data[1][name]", "doe"))
-		require.NoError(t, writer.WriteField("data[1][names]", "john,doe"))
 		require.NoError(t, writer.Close())
 
 		c.Request().Header.SetContentType(writer.FormDataContentType())
@@ -1031,8 +1030,6 @@ func Test_Bind_Body(t *testing.T) {
 		require.Len(t, cq.Data, 2)
 		require.Equal(t, "john", cq.Data[0].Name)
 		require.Equal(t, "doe", cq.Data[1].Name)
-		require.Contains(t, cq.Data[1].Names, "john")
-		require.Contains(t, cq.Data[1].Names, "doe")
 	})
 
 	t.Run("CollectionQuerySquareBrackets", func(t *testing.T) {

binder/form.go

@@ -57,29 +57,25 @@ func (b *formBinding) BindMultipart(reqCtx *fasthttp.RequestCtx, out any) error
 		return err
 	}
 
+	temp := make(map[string][]string)
 	for key, values := range data.Value {
 		if strings.Contains(key, "[") {
 			k, err := parseParamSquareBrackets(key)
 			if err != nil {
 				return err
 			}
-			data.Value[k] = values
-			delete(data.Value, key) // Remove bracket notation and use dot instead
 
 			key = k // We have to update key in case bracket notation and slice type are used at the same time
 		}
 
 		for _, v := range values {
 			if strings.Contains(v, ",") && equalFieldType(out, reflect.Slice, key) {
-				delete(data.Value, key)
-
-				values := strings.Split(v, ",")
-				for i := 0; i < len(values); i++ {
-					data.Value[key] = append(data.Value[key], values[i])
-				}
+				temp[key] = strings.Split(v, ",")
+			} else {
+				temp[key] = append(temp[key], v)
 			}
 		}
 	}
 
-	return parse(b.Name(), out, data.Value)
+	return parse(b.Name(), out, temp)
 }