Porting Tailscale to Plan 9

I like the premise of the joke, but then as the explanation ran on... I suddenly became depressed. So much broken stuff, so much complexity.... to, what, make a network tunnel? If all this extra work was the joke, that would be funny.

We had to do some Plan 9 work, which makes sense when doing something new, but the actual Tailscale implementation is far _less_ work than for other Unixes.

It sounds like the Go compiler is better after this effort - fewer Plan 9 special cases in the code.