DIFF is a package for computing various forms of differences between blobs of data and then doing neat things with those differences. Currently diff knows how to compute three common forms of differences: * "unified" format diffs, suitable for inspecting changes between different versions of files; * "context" format diffs, suitable for inspecting changes between different versions of files; * "vdelta" format binary diffs, which might be useful in a version control system for compact storage of deltas. An ASDF system is provided; there are no symbols exported from the DIFF package, as a good interface has not yet been decided upon. Documentation is fairly sparse. Nathan Froyd <froydnj@gmail.com>