forceNiceScale option, https://apexcharts.com/docs/options/yaxis/#forceNiceScale works fine when the range between min/max value is larger than 10, as can be seen in this codepen example:
https://codepen.io/anon/pen/agxvxO
But when the difference is less than 10, the value rounding is not working as can be seen here:
https://codepen.io/anon/pen/gNyaPw