Improve error information

I would like to suggest some improvements in error information in the cloud environment

Following code running as cloud function throws error, but now error message is given

try {
   let i = new BigInt("8980");
} catch (e) {"Error:" + JSON.stringify(e)); //will print out "Error: {}"

Class BigInt doesnt exist, so it should fail, but no error message is available, so it’s difficult to debug when you do wrong thing in longer code.