@@ -0,0 +1,237 @@
+import java.util.List;%0A%0Apublic class StrFun extends BuiltinFun %7B%0A%0A%09public StrFun() %7B%0A%09%09super(%22str%22, 1);// ignore param's count%0A%09%7D%0A%0A%09@Override%0A%09public Value apply(List%3CValue%3E args) %7B%0A%09%09return new StringValue(args.get(0).toString());%0A%09%7D%0A%7D%0A

add str: str(int/float/...)