Chartjs-Chart.js ignoring stepSize in the first and last step

I solved it with the ticks.callback-property, but I’m not too happy with it, feels dirty:

See docs here

ticks: {
    [...],
    callback: function(value, index, values) {
        if(index !== 0 && index !== values.length - 1){
            // Return value only when it's not the first and not the last
            return value;
        }
    }