export declare interface Dictionary<T> extends DictionaryNum<T> {
    [id: string]: T | undefined;
}

Getting the chance to use rtk for the first time, and using createEntityAdapter. Just coming across this and wondering why the possible value of an entity is undefined. The entity keys are created off the entity object so I can't imagine a scenario where it would be undefined. Not a big deal, but means accounting/coding for undefined every time you access an entity.

Thanks.