#188 rule: Questionable cast to concrete collection

[Hamlet D'Arcy]

BC: Questionable cast to concrete collection (BC_BAD_CAST_TO_CONCRETE_COLLECTION)

This code casts an abstract collection (such as a Collection, List, or Set) to a specific concrete implementation (such as an ArrayList or HashSet). This might not be correct, and it may make your code fragile, since it makes it harder to switch to other concrete implementations at a future point. Unless you have a particular reason to do so, just use the abstract collection class.