如何将map [string] interface {}中的不同值转换为golang中的string类型？

I have a map with different types in interface{} and I need to convert them all to string type. Type assertion is not enough.

package main

func main() {
    map1 := map[string]interface{}{"str1": "string one", "int1": 123, "float1": 0.123}

    var slc []string
    for _, j := range map1 {
        slc = append(slc, j.(string)) // panic: interface conversion: interface {} is int, not string
    }
}