> An interface on linux has only one ip address.

Just to point out, while the behaviour of any one OS is a useful data point for the discussion, it's not super useful to say "because OS 'foo' does things in a certain way, a well used programming language should limit it's design to that OS's way of doing things." :)

Hmmm, I guess I'm trying to say that (at least) Go should be fairly OS agnostic about this.