// StringMust : Must Conver "val" to a String
StringMust : Must Conver "val" to a String
// StringMust : Must Conver " val " to a String
func StringMust(val interface{}, def ...string) string {
	ret, err := String(val)
	if err != nil && len(def) > 0 {
		return def[0]
	}
	return ret
}
func StringMust ( val interface { } , def ... string ) string { ret , err := String ( val ) if err != nil && len ( def ) > 0 { return def [ 0 ] } return ret }
StringMust : Must Conver "val" to a String
StringMust : Must Conver " val " to a String