Cancellation/interrupt support for the JavaScript engines?

[Xenakios]

I am not sure if it's technically feasible or in the scope of choc to do but would be nice if there was a clean way to be able to stop JS scripts that are taking too long to run. Like if the end user writes a script like :

function generate_steps()
        {
            arr = [];
            for (var i=0;i<900000000;++i)
            {
              if (i % 5 == 0 || i % 11 == 0)
                arr.push(1.0);
              else arr.push(-1.0);
            }
            return arr;
        }