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ConnAs works in a similar way to errors.As. It allows a user to cut through the interface layers and extract a specific type of connection if available. This serves as a sort of escape hatch to allow users to leverage some connection specific feature without having to support that feature for all connections. Getting RTT information is one example. It also allows us, within the library, to get specific types of connections out of the interface box. This would have been useful in the recent changes in tcpreuse. See https://github.com/libp2p/go-libp2p/pull/3181 and https://github.com/libp2p/go-libp2p/pull/3142. Getting access to the underlying type can lead to hard to debug issues. For example, if a user mutates connection state on the underlying type, hooks that relied on only mutating that state from the wrapped connection would never be called. It is up to the user to ensure they are using this safely.