Author: Krzysztof Drewniak <krzysdrewniak AT gmail DOT com>
function: clos-diff:diff (old new &key (test #'equalp))
This function will create a diff that represents the modification that need to be applied to object old to create the object new. The test parameter will control the test used for equality. As a special case is the old parameter is nil, a diff from an object with no bound slots will be created.
function: clos-diff:apply-diff (diff &optional object)
This function will apply the diff given in the parameter diff to the object contained in object. If object is nil, a fresh object of the appropriate type (with all slots unbound) will be created, and the diff will be applied to that (See the documentation for diff for more information).