Obtain a LongArray.Iterator of the contents of the LongArray, starting
at a particular index such that the first call to next will
set the location of the iterator at the first existent index that is
greater than or equal to the specified index, or will throw a
NoSuchElementException if there is no such existent index.
Obtain a LongArray.Iterator of the contents of the LongArray in
reverse order (decreasing indices), starting at a particular
index such that the first call to next will set the
location of the iterator at the first existent index that is
less than or equal to the specified index, or will throw a
NoSuchElementException if there is no such existent index.