Lesson 27 - Srt vs String

I am not sure if this is a bug or an oversight, but everywhere in the course we have shortened string to str. However, in practice 1 or lesson 27 you can not use str, but must type out 'String'. I am not sure if this is required in Godot or not (im still learning), but it probably needs to be mentioned in the lesson or the notes if that is a requirement, as I believe this is the first time we have had to type out 'String' instead of abbreviating to str