FilteredList/SortedList

[Richard Bair]

> TransformationList is not modifiable. We had a big discussion about this (together with Micheal Heinrichs) about 2 years ago a decided we have to make all TransformationList subclasses unmodifiable as otherwise it would break the List contract. We'd have to have special implementation of sort for the WrappedList.

Several collections in the JDK explicitly state they violate the contract of List / Map / Set in some way or other. I wonder if it would be better to do so here?