I've been tinkering about with writing my own shell at home, as an excerise in learning more about unix etc but bumped up against the limitation in that proper

I've been tinkering about with writing my own shell at home, as an excerise in learning more about unix etc but bumped up against the limitation in that proper job control is currently impossible to do from within go (off the top of my head it was something to do with the inability to set the process group correctly for forkexeced processes). How did the author get around this, or does Elvish not have the ability to put processes into and out of the background?