Ensure the scale is parsed as integers

This will fix strange problems with calculating the current value of the slider.

**Problem Example:**

If we had pass the scale of `["25", "200"]`. When the current position of the handle is calculated, and the beginning portion of the scale is added to the calculated value we will have a integer + string. This will cause the beginning portion of the scale to be added as a string instead of a integer.

If the handle was at position `30` and we were calculating the positon it would be `30 + "25"` which will give us `"3025"` instead of `55` like we would expect