public struct Drop: Fn
Drop returns a new Arr or Page that contains the remaining elements, after
num have been removed from the head of the Arr or Page coll. If
drop value is
zero or negative, elements of coll are returned unmodified.
When applied to a page, the returned page’s before cursor is adjusted to exclude the dropped elements. As special cases:
dropvalue is negative, before does not change.
- Otherwise if all elements from the original page were dropped (including the case where the page was already empty), before will be set to same value as the original page’s after.