Default parses and binds to the default socket as given to us by the flag module.

Ready notifies the environment (for now, just Einhorn) that the process is ready to receive traffic.

Sniff attempts to select a sensible default bind string by examining its environment.

Socket parses and binds to the specified address.

WithFlag adds a standard flag to the global flag instance that allows configuration of the default socket.

DefaultBind specifies the fallback used for WithFlag() if it is unable to discover an environment hint (after checking $GOJI_BIND, Einhorn, systemd, and $PORT).