Convert map[interface {}]interface {} to map[string]string

Question

From a source I cannot influence I am given data in a map, which arrives as map[interface {}]interface {}.

I need to process the contained data, prefera

Answer 1

// data is map[string]interface{}

form := make(map[string]string)

for k, v := range data {
    form[k] = v.(string)
}