maps conveniently to the value being set through the proxy. A ``creator``
function could have been used instead if more flexibility was required.
-Because the proxies are backed a regular relation collection, all of the
+Because the proxies are backed a regular relation collection, all of the
usual hooks and patterns for using collections are still in effect. The
most convenient behavior is the automatic setting of "parent"-type
relationships on assignment. In the example above, nothing special had to