You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: qson.go
    path of file: ./repos/go-micro/util/qson
    
    the code of the file until where you have to start completion: // Package qson implmenets decoding of URL query params
// into JSON and Go values (using JSON struct tags).

    
func Unmarshal(dst interface{}, query string) error {
	b, err := ToJSON(query)
	if err != nil {
		return err
	}

	return json.Unmarshal(b, dst)
}