Does anyone have experiences on using objectstore?

I am looking for some documentation or clarification on how
Objectstore handles the following:

1. schema evolution
2. object versioning - From my understanding Objectstore does not have
any support for object versioning. Is this correct?
3. How Objectstore handles object Dereferencing and OIDs. My
understanding is that Objectstore doesnt use OIDs and referenced
persistent data is dynamically mapped into the workstation’s virtual
address space, and Objectstore uses Hardware Dereferencing.

Any help with clarification would be appreciated.