Enhancement for AbstractChoice and WildcardListModel API

According to Efective Java book (http://devender.files.wordpress.com/2008/05/effectivejava.pdf), item 28:

"No wildcard type for return value"

Especially "User should not have to think about wildcards to use your API".

so

public List<? extends E> getChoices()

should be changed to

public List<E> getChoices()

and for WildcardListModel

protected List<? extends T> createSerializableVersionOf(List<? extends T> object)

should be changed to

protected List<T> createSerializableVersionOf(List<? extends T> object)

Probably there is a lot of such things in framework.