registration set to each new client that connects. The
client-side version of this service will then register them
all. This means that serialized classes need only be registered
on the server.
I've modified DefaultClient and DefaultServer to register these
services by default because they make other services easier to
write and because they will save people lots of trouble.
I'm 90% sure there are no bad side-effects for people who choose
to continue doing things the old way but it may depend on when
they register their serializers in relations to creating the
client and server objects.
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