Components should have __private attributes that are not exposed to Js

[nerdoc]

The current approach with exclude is neat and does what it should. But it is not very intuitive.

What would be more interesting is adding support for _protected and/or __private attributes of a component. These should automatically not be exposed to the javascript frontend, but just usable in the backend.

[nerdoc]

AAARGH. This is already possible. Sorry again for the spam.

[adamghill]

No worries! Should I call out excluding private attributes more prominently in the docs?

[nerdoc]

Definitely!