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i want to use binary literals; technically only requires 1.13, but let's not be ancient

makes TestDialBackoff happy

Otherwise, canceling one dial request will cancel all "joined" dial requests.

Given two relay connections, prefer the one that's non-transient.
Otherwise, a transient connection could prevent us from opening streams
even if we have a second non-transient connection through a better relay.

* support for forced direct connections.

update deps to fix broken testing package

Treat transient connections as opt-in when opening new streams

avoid assigning a function to a variable

only listen on localhost in tests

prevent dialing addresses that we're listening on

It's impossible to run two nodes on the same IP:port, so we know for
sure that any dial to an address that we're listening on will fail (as
the peer IDs won't match).
In practice, this will be most useful for preventing dials to localhost
for nodes that are listening on the default port.

* add quic to swarm testing

* update go

use a context for OpenStream and NewStream

fix: handle case where swarm closes before stream

When we close a connection, we set the "stream" set to nil to avoid opening new
stream. Unfortunately, this meant we wouldn't decrement the reference count on
the swarm.

feat: update to latest go-libp2p-core interfaces

This commit switches over to the new Close/CloseWrite/CloseRead interface
changes in go-libp2p-core 0.7.0.

This change also removes a now obsolete hack to implicitly clean up streams
after reading an EOF; calling Close or Reset is now required.

See: https://github.com/libp2p/go-libp2p-core/releases/tag/v0.7.0