Boomerang: A bidirectional programming language for ad-hoc data

This is cool stuff, developed by the same group that first did Unison (a synching utility that I have grown addicted to).

The basic point is being able to define maps between data structures and then being able to update either end of the map and see the results transformed on the other - which is what Unison does at the filesystem/machine level; this is the same concept taken to the data structure level. It's hard stuff to get right, but it is so tantalizing.

Is it actively developed? The latest version is from 2009... I wonder if it have a version of 0.2, is it too far away from the last release?

It would be interesting to grasp what use it proves.

If I recall correctly, early versions of JavaFX attempts this as well in its data binding, allowing bidirectional binding even in functions.

Has anyone actually used this language? The Overview sounds interesting, but doesn't deliver any specific code examples...