export interface LatestRequestTicket<T> {
    readonly generation: number
    readonly snapshot: T
}

export interface LatestRequestGuard<T> {
    next(snapshot: T): LatestRequestTicket<T>
    invalidate(): number
    isLatest(ticket: LatestRequestTicket<T>): boolean
}

export function createLatestRequestGuard<T>(): LatestRequestGuard<T>