Is your feature request related to a problem? Please describe.
Currently the version used seems to be 22.0.0

Check:

As you can see here, a lot of cool stuff has been implemented: https://github.com/oracle/graaljs/blob/master/CHANGELOG.md

Take a look here too:
https://github.com/oracle/graaljs/blob/master/docs/user/JavaScriptCompatibility.md

If I try to run the following code with the current version it doesn't work, there are some things I would like to try, I don't even know if they work with the latest current version.

var BigDec = Java.type('java.math.BigDecimal');
var bd = new BigDec("0.1");
console.log(bd.add(bd).toString());

Describe the solution you'd like
Update the version to the latest.