GopherJS "leaking" repro

main.go

// this program demonstrates how fetches through gopherjs seem to be memory leaking.
package main

import (
        "fmt"
        "io"
        "io/ioutil"
        "log"
        "net/http"

        "github.com/gopherjs/gopherjs/js"
)

func main() {
        js.Global.Set("gocode", map[string]interface{}{
                "fetch": fetch,
        })
}

const (
        maxFetch = 10000
        fetchURL = "playground_gopherjs.js"
)

func fetch() {
        go func() {
                for i := 0; i < maxFetch; i++ {
                        fmt.Printf("Getting\n")
                        req, err := http.NewRequest("GET", fetchURL, nil)
                        if err != nil {
                                log.Fatal(err)
                        }
                        res, err := http.DefaultClient.Do(req)
                        if err != nil {
                                log.Fatal(err)
                        }
                        func() {
                                defer res.Body.Close()
                                if _, err := io.Copy(ioutil.Discard, res.Body); err != nil {
                                        log.Fatal(err)
                                }
                        }()
                }
        }()
}