It would be great if either the bind address could be specified via a option or it just defaults to 127.0.0.1

Currently symfony serve seems to default to 0.0.0.0 which means external connections are allowed and it will cause this annoying popup on macOS 13.3.1 each time it's started.

From a security standpoint it makes more sense anyway to default to 127.0.0.1
The usecase of external connections is very slim, IMO.