ariaLiveRegion (ariaLiveRegion) {
        if (!arguments.length) {
            return this._ariaLiveRegion;
        }
        this._ariaLiveRegion = ariaLiveRegion;
        return this;
    }
If set, the Number Display widget will have its aria-live attribute set to 'polite' which will
notify screen readers when the widget changes its value. Note that setting this method will also
disable the default transition between the old and the new values. This is to avoid change
notifications spoken out before the new value finishes re-drawing. It is also advisable to check
if the widget has appropriately set accessibility description or label. 
@param {Boolean} [ariaLiveRegion=false]
@returns {Boolean|NumberDisplay}