I think it would be wise to add a `shrink` operation when the array ends up being 1/4 full (shrink to 1/2 size). Otherwise you might end up hoarding memory you

I think it would be wise to add a `shrink` operation when the array ends up being 1/4 full (shrink to 1/2 size). Otherwise you might end up hoarding memory you don't need anymore. The operation would be called automatically whenever you delete an item from the array, checking if a `shrink` is appropriate.