rescale () {
        this._unitCount = undefined;
        this._resizing = true;
        return this;
    }
When changing the domain of the x or y scale, it is necessary to tell the chart to recalculate
and redraw the axes. (`.rescale()` is called automatically when the x or y scale is replaced
with {@link CoordinateGridMixin+x .x()} or {@link CoordinateGridMixin#y .y()}, and has
no effect on elastic scales.)
@returns {CoordinateGridMixin}