Does calling return on a generator call return on what it's iterating?

return-passed-through.js

// test for https://mobile.twitter.com/RangerMauve/status/1276579544766578688

var fn = {
        [Symbol.asyncIterator]: function(){return fn},
        next: async function(){
                console.log("iterating")
                return { value: 42, done : false }
        },
        return: function(){
                console.log("return")
                return {
                        value: 92,
                        done: true
                }
        }};
var gen = async function *(fn){ for await(let i of fn){
        console.log(i);
        const val = yield i ; // RETURN GETS FIRED & THEN ITERATION TERMINATES HERE 

        console.log("post-yield", val)
        await new Promise(res => setTimeout(res, 1000))
        console.log("post-await")
}};
var gfn = gen(fn)

gfn.next()
gfn.next()
gfn.next()
gfn.next()
gfn.return()