function _boundingExtentXYs(xs, ys, dest) {
  const minX = Math.min.apply(null, xs);
  const minY = Math.min.apply(null, ys);
  const maxX = Math.max.apply(null, xs);
  const maxY = Math.max.apply(null, ys);
  return createOrUpdate(minX, minY, maxX, maxY, dest);
}
@param {Array<number>} xs Xs.
@param {Array<number>} ys Ys.
@param {Extent} [dest] Destination extent.
@private
@return {Extent} Extent.