ActiveRepository is marked as internal

[GrayWolfy]

Subject. It's marked for internal API.
But There are examples in documentation with it.
Should I use this class or what?

[roxblnfk]

Hi. This feature is awaiting feedback.
If you find ActiveRepository a useful abstraction that doesn't require modifications, please let me know. I will remove the internal annotation (or you may open a PR to remove it)