Swift type erasure playground

This playground tries to explain type erasure by going through three erasure types. In the examples a Box protocol that contains an InsideType is used.

The type erasure examples:

• Creating a wrapper class that can hold a specific Box of Int (Not really type erasure)
• Creating a wrapper class that can hold any Box with InsideType of Int (Boxes of Ints)
• Creating a wrapper class that can hold any Box regardless of it's InsideType (Boxes of Any)