Bun TCP Sockets refuse to connect with hostname as "localhost"

[PranjalAgni]

What version of Bun is running?

1.0.11+f7f6233ea

What platform is your computer?

Darwin 23.1.0 x86_64 i386

What steps can reproduce the bug?

I wrote a simple TCP server and client just to try the new API but client refuses(ECONNREFUSED) to connect when I set hostname as localhost in the server. Sharing the code that I am running:

server.ts

Bun.listen<SocketData>({
  hostname: "localhost",
  port: 4000,
  socket: {
    data(socket, data) {
      console.log("Ack: ", socket.data.sessionId);
      console.log("Client says: ", data.toString());
    }, // message received from client
    open(socket) {
      console.log("Client connected");
      socket.data = {
        sessionId: randomUUID(),
      };
      socket.write(socket.data.sessionId);
    }, // socket opened
    close(socket) {
      console.log("Client disconnected");
    }, // socket closed

  },
});

client.ts

Bun.connect({
  hostname: "localhost",
  port: 4000,
  socket: {
    data(socket, data) {
      console.log("Got data from server: ", data.toString());
    },
  },
});

Output:

But as soon as I set the hostname as 127.0.0.1 on the server side it starts to work fine and socket connection/data exchange is getting made.

What is the expected behavior?

Socket connection should be made irrespective of the hostname is set localhost or 127.0.0.1

What do you see instead?

No response

Additional information

No response

[Electroid]

Possibly related: #1425

[PranjalAgni]

I updated the docs for now, so the TCP sockets example works #7188

[Jarred-Sumner]

This was fixed by happy eyeballs #11206