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this allows us to avoid revalidating messages, either because they were concurrently
received or were previously rejected by the validator.
also allows us to filter invalid messages from gossip.

advanced routers will want to know when they are subscribed to a topic as
they may want to send control messages.

Make FloodSub Protocols Configurable

update for transport refactor

We need to wait for the EOF from the other side when closing from the sending
side (unless we've already seen an EOF).

gx publish 0.9.13

fix segfault on arm due to bad atomic access

fixes #78

Don't block the event loop because of slow subscriptions

Closes #69

gx publish 0.9.11

UnregisterTopicValidator for removing topic validators

Modularized PubSub Routing

demote errors/warnings to info

* dropped/killed connections are not errors.
* handleIncomingRPC/publishMessage do not return errors.

Message Validators