MongoTalk and Replica Sets

For serious use of MongoDB, there is a need to support replica sets.

At this point, the MongoClient doesn't appear to support much more
than a simple mongod instance.

Is there support for that anywhere ?

(leaving behind the requirements for supporting GridFS and bulk operations).

Python and Node drivers do have support for these. Maybe someone
ported parts of them to Pharo?

TIA
Phil