I'm not sure I'm fan of this change. Using these wildcards breaks all kinds of code. What is the benefit?
The way it is implemented currently is also inconsistent: ListItem is typed as ListItem<T> but it should be ListItem<? extends T>. This gist: https://gist.github.com/dashorst/4ee7ab1696321f290a24 shows how this should be implemented. HOWEVER: I don't actually propose such a change, but rather have adcb7a632af8225e86e09e398b8fb5430b143b18 be reverted. The linked patch will break the world and for little to no benefit. adcb7a632af8225e86e09e398b8fb5430b143b18 breaks API in a couple of places, but I don't see the benefit of those breaks as well. Martijn
