Function isValidNumberForExtent

src/util/model.ts:1270–1274

(val: number | NullUndefined)

 * special handling and it will not be supported until required. So we simply ignore it here.
 */
export function isValidNumberForExtent(val: number | NullUndefined): boolean {
    // Considered that number could be `NaN` and `Infinity` and should not write into the extent.
    // Note that `Infinity` is the initialized value from `initExtentForUnion` and may be inputted.
    return val != null && isFinite(val);
}

export function isValidBoundsForExtent(start: number, end: number): boolean {
    return isValidNumberForExtent(start) && isValidNumberForExtent(end) && start <= end;