Doubt about some properties on the global window object on apps built with Bubble

Hello. I just started to study no code recently, so I still didn’t build anything with Bubble, because of that I’m sorry if my questions are kinda stupid. I was looking at the global window object on the developer tools and i found some strange properties on it, like ‘Lib’ and ‘client_db’, can someone explain me what they’re for? Its safe expose these properties like that?