VirtualTime::ArrayHelper

Expands ranges and other expandable types into a long list of all possible options. E.g. [1, 2..3, 4..5] gets expanded into [[1, 2, 4], [1,2, 5], [1,3,4], [1,3,5]]. Used only for convenience in tests.

Returns whether list is in ascending order.

Used to skip allocating a sorted copy of a list that is already sorted, which is the common case for hand-written rules like day: [1, 15].