String::class.java == returnType &&
        callArgs.size == 1 &&
        callArgs[0] is List<*>
      ) {
        val peerProtocols = callArgs[0] as List<*>
        // Pick the first known protocol the peer advertises.
        for (i in 0..peerProtocols.size) {
          val protocol = peerProtocols[i] as String
          if (protocol in protocols) {
            selected = protocol
            return selected
          }