I was developing in FB3 beta, and I was adding items to an
array using splice. it was adding the elements to the provided
index, and if it was greater then 0, it would add the empty
elements as needed. Then I installed FB3 and it stopped added the
needed preceding elements. So if the array was empty, even if I
specify the 3 index to put the item,
it just places it in the 0 index.