Support for the Ruby 2.1 series ended on March 31 2017. See here for details.
Handler for sending and receiving drb messages.
This takes care of the low-level marshalling and unmarshalling of drb requests and responses sent over the wire between server and client. This relieves the implementor of a new drb protocol layer with having to deal with these details.
The user does not have to directly deal with this object in normal use.