How lightweight are Racket's threads? I'm curious if they're really lightweight in the same way that goroutines are. Go's documentation states: "It is practical

How lightweight are Racket's threads? I'm curious if they're really lightweight in the same way that goroutines are. Go's documentation states: "It is practical to create hundreds of thousands of goroutines in the same address space." Is the same true for Racket threads? Or are they closer to "lightweight" green threads in other languages. I'm genuinely curious. If they are really as lightweight as goroutines, that should be publicized more heavily. If they're not, then it's disingenuous to claim that Racket's CSP story is equivalent to Go's.