If it were a list of nine items, it would look like the last picture in your post. What you really have is a list of two items, one of which is a list, i.e., you have a list of lists, a two-dimensional list. So, if you look at the first picture in your post, it has two rows. If we move our focus to the array with one million items, we can better understand the impact of choosing one approach instead of the other.

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If there are no elements in the collection that should be returned by the sole method, an \Illuminate\Collections\ItemNotFoundException exception will be thrown. If there is more than one element that should be returned, an \Illuminate\Collections\MultipleItemsFoundException will be thrown. If the given value is not found or the callback never returns true, the skipUntil method will return an empty collection.

If the HashSet size is exactly 100, it means that GetItems retrieved each element from the original array exactly once. The final array will have 100 items