…items.

If there are pre-existing items in the base container, the toal count depends on static count + countDelta instead of delta alone. Additionally, in this case the game deletes entry data only when countDelta == 0. These changes intend to mimic this behavior.

GetItemCountCached doesn't account for any sort of concurrency. Just two simoultaneous looped calls on different containers can result at best in a cascade of data clear/rebuilds, eliminating any advantage the function might have had. Since its benefits are marginal, due to its inherent call cost and the existence of GetItemsCount, I think it best to remove it externally rather than implement a better solution not using static data.