Maybe Andrew is referring to this? I'm just guessing but that is the only thing I can think of which could be considered broken. Go mostly just treat strings as bag of bytes and you have to use one of the unicode packages to actually do any significant work with them.

https://play.golang.com/p/Dla3sXciYXC

I also think string handling in Go is pretty sane. But range vs indexing on strings is something you need to be aware of.