Bulkwrite using monogdb

Im trying to bulk write using the new mongo drivers https://godoc.org/go.mongodb.org/mongo-driver/mongo.

	models := []mongo.WriteModel{}
	for i := 0; i <= 3; i++{
		models = append(models, mongo.NewInsertOneModel().SetDocument(bson.M{

	_, err := client.Database("mydb").Collection("mycoll").BulkWrite(context.TODO(), models)
	if err != nil{

	// len(models) - 1, 2, 3. 

when i see how many items are in my slice, i get 1, 2, 3. So all together 6 items. Which shouldve been just 3.
This inserts 6 items instead of 3, and im not sure how to fix it.
InsertMany method wouldve been possible, but its mandatory to work with BulkWrite

Im pretty baffled why this happened in the first place, because now it seems to run correctly. Maybe somebody knows why…

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