forceListOf<T> function
Ensure the given item is a List of type T.
If item is null, an empty list is returned.
If item is already a List, a copy of items converted into T is returned.
Otherwise, return item converted into T and wrapped in a list.
Implementation
List<T> forceListOf<T>(dynamic item) => forceList(item).map((e) => changeTo<T>(e)).toList();