What version of Go are you using (go version)?

$ go version
1.14.4

Does this issue reproduce with the latest release?

yes 1.13 is right

What operating system and processor architecture are you using (go env)?

$ go env

What did you do?

What did you expect to see?

package main

import (
"context"
"fmt"
)

func main(){
var md = make(map[string]string)
md["test"] = "it a map"
ctx := context.WithValue(context.TODO(),"key",md)
fmt.Println(ctx)
}
context.TODO.WithValue(type string, val

context WithValue donot write map type

What did you see instead?

can write map