Where did Shortest List, Longest List, and Cross Reference data matching go?

As of Grasshopper version 0.9.x, this functionality, which used to be contained in the component contextual menu, has now been made into separate components. This allows for very precise control over how data is matched, as well as greater compatibility with data tree logic. All in-component data matching now functions according to "Longest List" behavior, which has always been the default.

If you wish to reproduce the old behavior with the new components, all you need to do is place one of the new data matching components in between your inputs and the component which previously would have been assigned an alternate data matching. So if your old definition looked like this:

Your new definition will look like this:

Additional inputs to the data matching components can be added via the ZUI (Zoomable User Interface) - simply zoom into the component and hit plus to add a new input and matching output. The default behavior of "Holistic" corresponds to the old Cross Reference data matching behavior.

There are now many other options for how Cross Reference can function, which are outlined in detail here.  Short List and Long List matching also now have additional matching modes, explained here.