A package to provide both extended functions and features for handling collection-based data.
The type WeakArray behaves almost like an array, except it does not retain the elements it manages.
Instead, it keeps a weak reference to each of its elements.
WeakArray conforms to protocols of the collection family,
including Collection, MutableCollection, BidirectionalCollection, RangeReplaceableCollection.
This makes it support various kinds of methods you are already familiar with,
such as map(_:), reversed(), replaceSubrange(_:with:), removeAll(where:), and more.
In the circumstances where the array may keep a large number of references to objects that have been
deallocated from the memory, the method removeReferencesOfDeallocatedObject() is provided to
perform a clean-up for such case.