Type alias IntervalData<EntryType, N>

IntervalData<EntryType, N>: ({
    entries: Immutable<EntryType>[];
    interval: IntegerInterval<N>;
} | {
    interval: IntegerInterval<N>;
    missing: true;
})[]

An array indicating which intervals and entry are included in a FetchedIntervalCache, and which intervals still need to be fetched.