“Spawn early, await late”

Start tasks as soon as you can, await when you must:

var {*} = import("slug.channel")
nursery fn handler(req) {
    var aT = spawn { fetchA(req) }
    var bT = spawn { fetchB(req) }

    var a = await(aT)
    // do some CPU work here while b runs...
    var b = await(bT)

    combine(a, b)
}